CN113931089A - Limiting device for bridge anti-overturning and anti-pulling reinforcement and construction method thereof - Google Patents
Limiting device for bridge anti-overturning and anti-pulling reinforcement and construction method thereof Download PDFInfo
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- CN113931089A CN113931089A CN202111361011.9A CN202111361011A CN113931089A CN 113931089 A CN113931089 A CN 113931089A CN 202111361011 A CN202111361011 A CN 202111361011A CN 113931089 A CN113931089 A CN 113931089A
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Abstract
The invention relates to the technical field of bridge anti-overturning and anti-pulling reinforcement, in particular to a limiting device for bridge anti-overturning and anti-pulling reinforcement and a construction method thereof. The method aims at solving the problems of high construction difficulty, high reinforcement cost and long construction period in the bridge single-column pier anti-overturning reinforcement method in the prior art and the problems that no better solution is available in the climbing and moving of a curved bridge and the upwarp of the side span of a continuous steel beam bridge. The technical scheme adopted by the invention comprises a first bottom steel plate connected with a main beam and a second bottom steel plate connected with an abutment, wherein a pair of channel steels are symmetrically welded at the lower part of the first bottom steel plate; the main beam is of a reinforced concrete structure or a steel structure.
Description
Technical Field
The invention relates to the technical field of bridge anti-overturning and anti-pulling reinforcement, in particular to a limiting device for bridge anti-overturning and anti-pulling reinforcement and a construction method thereof.
Background
In recent years, overturning and side turning accidents of single-column pier bridges sometimes occur. The main reason of the accident is the overloading of the vehicle, but the design of single column pier single support and small-spacing double support which are not reasonable in compliance still has certain hidden trouble. Therefore, the single-column pier single-support and small-spacing double-support bridge is transformed, and the anti-overturning performance of the bridge is further improved. Meanwhile, under the action of temperature, the climbing problem of the small-radius curve bridge and the upwarp problem of the side span of the continuous steel beam bridge can all cause adverse effects on the driving safety of the bridge.
The current anti-overturning reinforcement measures for the single-column pier comprise: and measures such as additionally arranging a capping beam, additionally arranging a pile column, widening the pier column and the like on the single-column pier. Although the measures can effectively improve the anti-overturning capacity of the bridge, the measures have the defects of high construction difficulty, high construction cost, long construction period and the like.
The problems of climbing of a curved bridge, upwarping of a side span of a continuous steel beam bridge and the like are all caused by imperfect design concept of an early bridge structure, longitudinal and upward deformation or displacement of the bridge under the action of temperature cannot be solved by a simple transverse shockproof stop block, and a better solution cannot be provided at the present stage aiming at the problems.
Disclosure of Invention
In view of the above, the invention provides a limiting device for bridge anti-overturning and anti-pulling reinforcement and a construction method thereof, aiming at the problems of high construction difficulty, high reinforcement cost and long construction period in the bridge single-column pier anti-overturning reinforcement method in the prior art and the problem that no better solution is available such as curved bridge creeping and continuous steel beam bridge side span upwarping.
In order to solve the problems in the prior art, the technical scheme adopted by the invention is as follows: the utility model provides a bridge antidumping and reinforced (rfd) stop device, its characterized in that: the limiting device comprises a first bottom steel plate connected with the main beam and a second bottom steel plate connected with the pier, a pair of channel steels are symmetrically welded at the lower part of the first bottom steel plate, I-shaped steel is vertically welded on the second bottom steel plate and is arranged between the pair of channel steels, and pi-shaped steel baffles are arranged at the bottoms of the I-shaped steel and are welded on the pair of channel steels;
the main beam is of a reinforced concrete structure or a steel structure.
Furthermore, the main beam is of a concrete structure, and the first bottom steel plate is connected with the beam body through an anchor bolt.
Furthermore, the main beam is of a steel structure, and the bottom steel plate II is connected with the beam body in a welding mode.
Furthermore, a tetrafluoro sliding plate is arranged between the I-shaped steel and the Pi-shaped steel baffle, and a stainless steel thin plate with the thickness of 1mm is welded on the upper surface of the tetrafluoro sliding plate to ensure the free sliding.
Furthermore, when the girder is a steel structure girder, the first bottom steel plate is internally provided with an anti-pulling stiffening rib.
Furthermore, the type of the I-shaped steel is not less than that of 20a channel steel.
Furthermore, the type of the channel steel is not less than that of the No. 12 channel steel.
Further, the thickness of the first bottom steel plate and the second bottom steel plate is not less than 20 mm.
Furthermore, the I-steel adapts to different bridge abutment skew angles by adjusting the cutting angle.
A construction method of a limiting device for bridge anti-overturning and anti-pulling reinforcement comprises the following steps:
the method comprises the following steps: determining the position of the anti-pulling device needing to be installed through calculation, and marking the position by using a marking pen; marking the punching position of the anchor bolt, wherein the anchor bolt is required to avoid the stressed steel bar;
step two: through load preloading, the limiting device is guaranteed to reach the designed preload after unloading;
step three: for the reinforced concrete girder, connecting the first bottom steel plate with the girder through an anchor bolt;
for the steel structure main beam, firstly welding an anti-pulling stiffening rib at the middle position of a first main beam bottom steel plate, and then welding and installing the first bottom steel plate at the bottom of the steel main beam;
step four: connecting the bottom steel plate II with the abutment through an anchor bolt; if the pier connecting surface is a curved surface, a bottom steel plate with a corresponding curvature is selected;
step five: installing I-shaped steel and channel steel by welding; the installation position is strictly executed according to a design drawing, and the installation error cannot exceed 5 percent;
step six: and (3) contacting the top surfaces of the tetrafluoro sliding plate and the pi-shaped steel baffle, and installing the center line of the pi-shaped steel baffle and the center line of the tetrafluoro sliding plate in a back-to-back mode, wherein the pi-shaped steel baffle is connected with the channel steel through welding.
Compared with the prior art, the invention has the following beneficial effects:
1. the device is simple and convenient to install, most parts are obtained by prefabrication, only welding and installation are needed on a construction site, and the construction period is short.
2. The device of the invention adopts prefabricated components, has no cast-in-place content, and can carry out on-site assembly construction under the traffic condition.
3. The construction method of the invention can be used for reinforcing traffic without interrupting the construction process, and is convenient and fast to construct.
4. Compared with the traditional anti-overturning reinforcing method, the construction method has the advantages of less material consumption and lower manufacturing cost.
5. The invention has wide application range, can be used for anti-overturning reinforcement and can also be used for solving the problems of climbing of a curved bridge and upwarp of the side span of a continuous steel beam bridge.
Drawings
FIG. 1 is a schematic elevation view of a stop device for a concrete girder;
FIG. 2 is a schematic elevation view of the limiting device in the case of a steel main beam;
FIG. 3 is a schematic cross-sectional view of a stop device I-I;
FIG. 4 is a schematic view of a pi steel plate construction;
FIG. 5 is a schematic view of the connection of the channel steel with the first bottom steel plate and the second bottom steel plate;
fig. 6 is a schematic elevation view of the single pier anti-capsizing reinforcement.
Fig. 7 is a schematic side view of a single column pier for anti-overturning reinforcement.
Description of the labeling: 1. anti-pulling stiffening ribs; 2-1, a first bottom steel plate; 2-2, a bottom steel plate II; 3. i-shaped steel; 4. a tetrafluoro slide plate; 5. a pi-shaped steel baffle plate; 6-1, anchor bolt I; 6-2 anchor bolts II, 7 and channel steel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Before the device is installed, data such as drawings and detection reports of bridges need to be collected. And then whether the bridge structure needs uplift reinforcement or overturn reinforcement is determined through calculation, and particularly, the position of the stressed steel bar needs to be concerned if the device disclosed by the invention needs to be installed.
The invention relates to a limiting device for bridge anti-overturning and anti-pulling reinforcement, which comprises a first bottom steel plate 2-1 connected with a girder and a second bottom steel plate 2-2 connected with an abutment, wherein a pair of channel steels 7 are symmetrically welded at the lower part of the first bottom steel plate 2-1, I-shaped steels 3 are vertically welded on the second bottom steel plate 2-2, the I-shaped steels 3 are arranged between the pair of channel steels 7, pi-shaped steel baffles 5 are arranged at the bottoms of the I-shaped steels 3, and the pi-shaped steel baffles 5 are welded on the pair of channel steels 7;
the main beam is of a reinforced concrete structure or a steel structure. The main beam is of a concrete structure, and the bottom steel plate I2-1 is connected with the beam body through an anchor bolt; the main beam is of a steel structure, and the bottom steel plate 2-1 is connected with the beam body in a welding mode.
A tetrafluoro sliding plate 4 is arranged between the I-shaped steel 3 and the Pi-shaped steel baffle 5, and a stainless steel thin plate with the thickness of 1mm is welded on the upper surface of the tetrafluoro sliding plate 4 to ensure the free sliding.
When the girder is a steel structure girder, the anti-pulling stiffening rib 1 is arranged in the first bottom steel plate 2-1.
The I-steel 3 adapts to different bridge abutment skew angles by adjusting the cutting angle.
The construction method of the limiting device for bridge anti-overturning and anti-pulling reinforcement comprises the following steps:
the method comprises the following steps: determining the position of the anti-pulling device needing to be installed through calculation, and marking the position by using a marking pen; marking the punching position of the anchor bolt, wherein the anchor bolt is required to avoid the stressed steel bar;
step two: through load preloading, the limiting device is guaranteed to reach the designed preload after unloading;
step three: for the reinforced concrete girder, connecting the bottom steel plate I2-1 with the girder through an anchor bolt 6;
for the steel structure main beam, firstly welding an anti-pulling stiffening rib 1 at the middle position of a first main beam bottom steel plate 2-1, and then welding and installing the bottom steel plate 2-1 at the bottom of the steel main beam;
step four: connecting the bottom steel plate II 2-2 with the abutment through an anchor bolt; if the pier connecting surface is a curved surface, a bottom steel plate with a corresponding curvature is selected;
step five: mounting the I-shaped steel 3 and the channel steel 7 by welding; the installation position is strictly executed according to a design drawing, and the installation error cannot exceed 5 percent;
step six: the top surfaces of the tetrafluoro sliding plate 4 and the pi-shaped steel baffle 5 are contacted, the center line of the pi-shaped steel baffle 5 and the center line of the tetrafluoro sliding plate 4 are arranged oppositely, and the pi-shaped steel baffle 5 is connected with the channel steel 7 through welding.
Example 1
Aiming at a certain bridge needing anti-overturning reinforcement, the bridge is a (20+30+30+25) m cast-in-place box girder, and the lower structure adopts a supporting mode of a single column pier and a single support. In order to prevent the bridge from generating overturn damage and carry out overturn resistance reinforcement on the bridge, the limiting device is installed.
Fig. 1, 3, 4, 5, 6 and 7 show an anti-overturning reinforcement stop device for a concrete girder. The adopted limiting device comprises a bottom steel plate, I-shaped steel 3, a tetrafluoro sliding plate 4, a pi-shaped steel baffle 5, an anchor bolt and channel steel 7;
the bottom steel plate comprises a first bottom steel plate 2-1 connected with the concrete girder and a second bottom steel plate 2-2 connected with the abutment, the anchor bolts comprise a first anchor bolt 6-1 connected with the first bottom steel plate 2-1 of the concrete girder and a second anchor bolt 6-2 connected with the second bottom steel plate 2-2 of the abutment, and the installation positions of the bridge are shown in figures 6 and 7.
Specifically, the sizes and the installation positions of all the components are determined according to the structure, the stress calculation result and the standard structure requirement of the bridge.
Specifically, the size of the bottom steel plate II 2-2 and the specification of the anchor bolt II 6-2 are selected according to the calculation result, and then the bottom steel plate II 2-2 is connected with the single-column pier through the anchor bolt II 6-2.
The anti-overturning reinforcing limiting device is installed under the girder and connected with the single-column pier, and the installation position is the side face of the single-column pier in the travelling direction.
Specifically, this bridge totally 2 single pier, so need design 4 antidumping stop device.
Specifically, the distance between the channel steel 7 and the pier or the cap beam is calculated, and specifically, the distance is related to the span grade of the bridge, and the like, and is set to be 500mm in the example.
The thickness of the first bottom steel plate 2-1 connected with the concrete girder is 25mm, the thickness of the second bottom steel plate 2-2 connected with the capping beam or the abutment is 25mm, specifically, the size of the first bottom steel plate 2-1 connected with the concrete girder is 280mm and 340mm, and the size of the second bottom steel plate 2-2 connected with the capping beam or the abutment is 350mm and 350 mm.
The anchor bolt is of an M18 model, a hole is punched according to a lofting position and is implanted into the bent cap or the abutment, bar-planting glue is injected into the hole, and the anchoring depth is larger than 16 cm.
The leaking part of the anchor bolt 6 assembly needs to be coated with an anticorrosive coating within the range of 5cm from the anchor bolt coating to the concrete.
Further, the channel steel 7 is connected with the first bottom steel plate 2-1 through welding.
Specifically, the type of the channel steel 7 is determined according to the anti-overturning requirement of the bridge, and the channel steel No. 12 is selected in the embodiment and is 650mm in length.
Further, the I-shaped steel 3 is perpendicular to the second bottom steel plate 2-2 and is connected through welding.
Specifically, the device is installed on the side face of the bridge in the travelling direction, so that the cutting angle theta is 0.
Specifically, the type of the I-beam 3 is determined according to the anti-overturning requirement of the bridge, and 20a I-beams with the length of 650mm are selected in the embodiment.
Furthermore, the tetrafluoro sliding plate 4 is adhered to the top surface of the pi-shaped baffle 5, and a stainless steel sheet with the thickness of 1mm is welded on the contact surface (the bottom surface of the I-shaped beam) of the tetrafluoro sliding plate 4 to ensure the free sliding.
Further, carry out the pre-compaction to the girder through the counter weight, and then make stop device have prestressing force. The counterweight can use a special counterweight block or a loading vehicle.
Specifically, the pre-pressing requires a symmetrical pre-pressing.
Further, the air temperature at the time of installation should be at the lowest air temperature of the day. If the conditions allow, the temperature is avoided to be higher than 20 ℃ during installation.
Furthermore, after all the beam end supports are tightly attached to the main beam. Installing a tetrafluoro slide plate 4, and finally welding a pi-shaped steel baffle 5 below the I-shaped steel 3 in a positioning manner. The tetrafluoro slide plate 4 is closely attached to the top of the I-beam.
Further, the preload is removed.
Generally, all steel components are anticorrosive according to the anticorrosive grade of girder.
Generally, the position of the original bench cap reinforcement is detected before the anchor bolt is implanted, and the position is properly adjusted to avoid the main reinforcement of the pier.
Generally, the requirement of welding seams of the anti-pulling device on the manufacturing site is not lower than two levels.
Example 2
For a certain z-bridge needing anti-overturning reinforcement, the bridge is a (35+50+50+25) m steel box girder, as shown in fig. 2, and the lower structure adopts a support mode of a single column pier and a single support. In order to prevent the bridge from generating overturn damage, the limiting device is installed for overturn resistance and reinforcement.
Except the uplift reinforcing rib 1, the other embodiments 1 are consistent with the concrete anti-overturning limiting device.
Specifically, the uplift stiffening rib 1 is to be installed at a middle position of a bottom steel plate, and the bottom steel plate is connected with the steel girder.
Specifically, the uplift stiffening ribs 1 are connected with the main beam in a welding mode. Specifically, the bottom steel plate is connected with the steel main beam in a welding mode.
Specifically, the anti-pulling stiffening ribs are used for reinforcing the bottom plate of the beam bottom welding part of the anti-pulling device and are arranged at intervals corresponding to the anti-pulling device.
The size of the anti-pulling stiffening rib 1 is obtained by calculation according to the width of the bridge, the local stability of the steel and the required anti-pulling target.
Example 3
The limiting device is used for solving the problem that a certain continuous steel box girder bridge (span 30+55+30) needs to be lifted up on the side span, and is installed for preventing the bridge from excessively seriously damaging other auxiliary structures of the bridge on the side span, influencing traffic passage and reinforcing the bridge against overturning.
The construction and installation of the stopper device are substantially the same as those of example 2.
In a different way, the embodiment is only installed on the bridge abutment and connected with the side span main beam.
Specifically, 3 stopper devices are attached to each of the 0 th and 3 rd stands, and the structure is as shown in fig. 2.
Further, the installation should be performed at a temperature at which the side span does not warp upward, and pre-pressing is required to bring the abutment seats into tight contact.
In the above embodiment, the welding should be performed by double-sided welding to ensure the welding quality.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.
Claims (10)
1. The utility model provides a bridge antidumping and reinforced (rfd) stop device, its characterized in that: the limiting device comprises a first bottom steel plate (2-1) connected with the main beam and a second bottom steel plate (2-2) connected with the abutment, a pair of channel steels (7) are symmetrically welded at the lower part of the first bottom steel plate (2-1), I-shaped steel (3) is vertically welded on the second bottom steel plate (2-2), the I-shaped steel (3) is arranged between the pair of channel steels (7), a pi-shaped steel baffle (5) is arranged at the bottom of the I-shaped steel (3), and the pi-shaped steel baffle (5) is welded on the pair of channel steels (7);
the main beam is of a reinforced concrete structure or a steel structure.
2. The limiting device for bridge anti-overturning and anti-pulling reinforcement according to claim 1, characterized in that: the main beam is of a concrete structure, and the first bottom steel plate (2-1) is connected with the beam body through an anchor bolt.
3. The limiting device for bridge anti-overturning and anti-pulling reinforcement according to claim 1, characterized in that: the main beam is of a steel structure, and the second bottom steel plate (2-1) is connected with the beam body in a welding mode.
4. The limiting device for bridge anti-overturning and anti-pulling reinforcement according to claim 2 or 3, wherein: the stainless steel slide plate is characterized in that a tetrafluoro slide plate (4) is arranged between the I-shaped steel (3) and the Pi-shaped steel baffle (5), and a stainless steel thin plate with the thickness of 1mm is welded on the upper surface of the tetrafluoro slide plate (4) to ensure the free sliding.
5. The limiting device for bridge anti-overturning and anti-pulling reinforcement according to claim 4, wherein: when the girder is a steel structure girder, the first bottom steel plate (2-1) is internally provided with an anti-pulling stiffening rib (1).
6. The limiting device for bridge anti-overturning and anti-pulling reinforcement according to claim 5, wherein: the type of the I-shaped steel (3) is not less than that of a No. 20a channel steel.
7. The limiting device for bridge anti-overturning and anti-pulling reinforcement according to claim 6, wherein: the type of the channel steel (7) is not less than that of the channel steel No. 12.
8. The limiting device for bridge anti-overturning and anti-pulling reinforcement according to claim 7, wherein: the thickness of the first bottom steel plate (2-1) and the second bottom steel plate (2-2) is not less than 20 mm.
9. The limiting device for bridge anti-overturning and anti-pulling reinforcement according to claim 8, wherein: the I-steel (3) adapts to different bridge abutment oblique crossing angles by adjusting the cutting angle.
10. The construction method of the limiting device for bridge anti-overturning and anti-pulling reinforcement according to claim 1, characterized in that: the method comprises the following steps:
the method comprises the following steps: determining the position of the anti-pulling device needing to be installed through calculation, and marking the position by using a marking pen; marking the punching position of the anchor bolt, wherein the anchor bolt is required to avoid the stressed steel bar;
step two: through load preloading, the limiting device is guaranteed to reach the designed preload after unloading;
step three: for the reinforced concrete girder, the first bottom steel plate (2-1) is connected with the girder through an anchor bolt (6);
for the steel structure girder, firstly welding an anti-pulling stiffening rib (1) at the middle position of a first steel plate (2-1) at the bottom of the girder, and then welding and installing the first steel plate (2-1) at the bottom of the steel girder;
step four: connecting the second bottom steel plate (2-2) with the abutment through an anchor bolt; if the pier connecting surface is a curved surface, a bottom steel plate with a corresponding curvature is selected;
step five: mounting the I-shaped steel (3) and the channel steel (7) by welding; the installation position is strictly executed according to a design drawing, and the installation error cannot exceed 5 percent;
step six: the top surfaces of the tetrafluoro sliding plate (4) and the pi-shaped steel baffle (5) are contacted, the center line of the pi-shaped steel baffle (5) is arranged opposite to the center line of the tetrafluoro sliding plate (4), and the pi-shaped steel baffle (5) is connected with the channel steel (7) through welding.
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| CN202111361011.9A CN113931089A (en) | 2021-11-17 | 2021-11-17 | Limiting device for bridge anti-overturning and anti-pulling reinforcement and construction method thereof |
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| CN202111361011.9A CN113931089A (en) | 2021-11-17 | 2021-11-17 | Limiting device for bridge anti-overturning and anti-pulling reinforcement and construction method thereof |
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Cited By (1)
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| CN114737467A (en) * | 2022-05-20 | 2022-07-12 | 中亿丰建设集团股份有限公司 | Bridge anti-overturning device and construction method thereof |
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