Novel formwork system at bridge splicing and widening seam under old bridge passing condition

Abstract

The invention provides a novel formwork system at a bridge widening seam under the old bridge passing condition, and belongs to the technical field of bridge widening. Comprising an old bridge and a new bridge, U-shaped steel bars are fixedly connected to the side faces of the old bridge and the new bridge, and a containing frame is installed on the side face of the new bridge; the reinforcing steel bar detection assembly is used for rapidly detecting reinforcing steel bars after the new bridge settles, and the reinforcing steel bar detection assembly is connected with the supporting frame. By arranging the steel bar detection assembly, the transverse steel bars which are bent or fall off seriously are marked and protruded in new bridge settlement, so that the stress condition of the transverse steel bars in a new bridge can be quickly checked, the positions where the transverse steel bars are separated from the U-shaped steel bars are recorded after the new bridge settlement, the risk that the transverse steel bars are not repaired due to neglect of falling off is reduced, and the repair efficiency is improved. Tensile stress concentration is generated when the concrete shrinks, the tensile stress value is reduced to exceed the tensile strength of the concrete, and longitudinal or transverse cracks in the subsequent concrete shrinkage process are effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of bridge widening, and in particular to a new template system for bridge widening joints under the condition that an old bridge is passable. Background Art

[0002] The splicing and widening of bridges generally adopts the method of widening on both sides. When removing the outer cantilever of the original bridge, a lot of chiseling work is required. In addition, the widened bridge needs to ensure coordinated force between the new and old bridges to effectively improve the overall performance of the structure and meet the needs of large traffic volume and high load on the highway.

[0003] In the widening construction of existing municipal elevated bridges, the construction process is as follows: first, steel bars are chiseled out at the cantilever flange plate on the outside of the old bridge, and then a new bridge is built. The new bridge needs to be arranged side by side with the old bridge, and the standard spacing between the steel bars chiseled out from the flange plate is maintained. Then, the U-shaped steel bars of the old bridge and the new bridge are welded and tied together using transverse steel bars. After completing all the connection operations, it is necessary to wait for the settlement of the new bridge to stabilize for a period of time. After the settlement is completed, a random inspection is carried out on the connection status of the steel bars of the new and old bridges. Concrete can only be poured after the random inspection is qualified.

[0004] However, in the above process, the transverse reinforcement tied to the U-shaped reinforcement will drop as the new bridge sinks. Since the transverse reinforcement tied to the old bridge has not dropped, and both ends of the transverse reinforcement are welded to the U-shaped reinforcement of the new and old bridges respectively, the middle position of the transverse reinforcement will bulge and bend upward during settlement. If any end of the transverse reinforcement is not welded firmly, it will detach from the U-shaped reinforcement during settlement. After the settlement is completed, due to the large number of reinforcement groups tied, random inspections are usually used to inspect the settled reinforcement. However, random inspections cannot cover the connection between each transverse reinforcement and the U-shaped reinforcement. It is easy to ignore the problem of some transverse reinforcement detaching from the U-shaped reinforcement, resulting in uneven force distribution of the local reinforcement. During the subsequent concrete pouring, the deadweight of the concrete may cause the transverse reinforcement that is not welded firmly to fall off, which in turn leads to tensile stress concentration when the concrete shrinks. When the tensile stress exceeds the tensile strength of the concrete, longitudinal or transverse cracks will appear in the concrete along the joints.

[0005] Therefore, this application provides a new template system for widening joints of bridges under the condition of old bridge traffic to meet the needs. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a new formwork system for the widening joints of bridges under the condition of old bridge traffic. By setting up a steel bar detection component, the problem positions of steel bar welding and binding in the entire bridge are accurately located, thereby improving the efficiency and accuracy of random inspections, reducing the risk of ignoring the falling off of transverse steel bars and not repairing them, and effectively avoiding the occurrence of longitudinal or transverse cracks in the subsequent concrete shrinkage process. The above settings can solve the problem that the existing random inspection method is used to inspect the steel bars after settlement, but the random inspection cannot cover the connection between each transverse steel bar and the U-shaped steel bar, and it is easy to ignore the problem of some transverse steel bars detaching from the U-shaped steel bars, resulting in uneven force distribution of local steel bars.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A new formwork system for widening joints of bridges under the condition that an old bridge is passable comprises an old bridge and a new bridge, wherein the sides of the old bridge and the new bridge are fixedly connected with U-shaped steel bars, and the surfaces of the U-shaped steel bars are fixedly connected with transverse steel bars, support frames are installed on the sides of the old bridge, and placement frames are installed on the sides of the new bridge; a steel bar detection component is used for rapid detection of steel bars after settlement of the new bridge, and the steel bar detection component is connected to the support frame.

[0009] Optionally, the steel bar detection component includes a protective sleeve fixedly connected to the outer wall of the support frame, a buffer pad 1 is fixedly connected to the middle position of the support frame near the protective sleeve, and a sleeve is fixedly connected to the side of the protective sleeve away from the buffer pad 1.

[0010] Optionally, a sleeve pad is fixedly connected to the bottom of the inner wall of the sleeve, a spring column is fixedly connected to the middle position of the top of the sleeve pad, and a lifting plate is fixedly connected to the outer wall of the sleeve.

[0011] Optionally, a connecting column is fixedly connected to the outer wall of the top of the lifting plate, a bellows is fixedly connected to the outer wall at the middle position of the connecting column, sliding frames are fixedly connected to both sides of the connecting column close to the lifting plate, a movable column is installed on the outer wall of the support frame close to the sleeve, a resistance column is fixedly connected to the end of the movable column away from the support frame, and a traction rope is fixedly connected to the outer wall of the resistance column.

[0012] Optionally, a reinforcing plate 1 is fixedly connected to the middle position of the bottom of the support frame, a jacket 1 is fixedly connected to the top of the connection between the reinforcing plate 1 and the support frame, weakened portions are provided on both sides of the inner wall of the jacket 1, and a plurality of filling holes are provided on the surface of the support frame.

[0013] Optionally, a second buffer pad is fixedly connected to the middle position of the placement rack, a reinforcement sleeve is fixedly connected to the side of the placement rack away from the second buffer pad, a pressing block is fixedly connected to the outer wall of the reinforcement sleeve, a second reinforcing plate is fixedly connected to the middle position of the bottom of the placement rack, and a second jacket is fixedly connected to the top of the connection between the second reinforcing plate and the placement rack.

[0014] Optionally, the protective sleeve is symmetrically fixedly connected to both sides of the support frame, the inner wall of the sleeve is hollow, a sliding groove is provided on the outer wall of the sleeve, a limiting block is provided on the top of the sleeve, and the sleeve is symmetrically fixedly connected to both sides of the support frame.

[0015] Optionally, a weakened notch is provided on the outer wall of the connecting column, a connecting arc plate is fixedly connected to the connection between the connecting column and the lifting plate, the top of the sliding frame is fixedly connected to both sides of the connecting arc plate, the bottom of the sliding frame is slidably connected to the sliding groove of the sleeve, and a universal ball is installed at the connection between the movable column and the support frame.

[0016] Optionally, the reinforcing plate 1 is made of metal, lightweight grooves are provided on both sides of the jacket 1, and a soft pad is installed at the bottom of the inner wall of the jacket 1.

[0017] Optionally, the shape of the pressing block is adapted to the shape of the inner wall of the sleeve.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] In the above scheme, by setting up a steel bar detection component, the transverse steel bars on the new bridge can be located during the settlement of the new bridge, and the transverse steel bars that are severely bent or detached will be marked with protrusions, so that the stress conditions of the transverse steel bars in the new bridge can be quickly checked, which is convenient for the precise positioning of the random inspection operation. After the new bridge settles, combined with the random inspection operation, the positions of the protrusions and marks of the steel bar detection components are inspected and repaired in a focused manner, and the positions where the transverse steel bars are detached from the U-shaped steel bars are recorded, thereby improving the efficiency and accuracy of the random inspection and reducing the risk of neglecting the detachment of the transverse steel bars and not repairing them. When the concrete shrinks, tensile stress concentration is generated, and the tensile stress value is reduced to exceed the tensile strength of the concrete, effectively avoiding the occurrence of longitudinal or transverse cracks during the subsequent concrete shrinkage process.

[0020] By arranging sleeves, sleeve pads and spring columns in the steel bar detection assembly, it can not only ensure that the placement frame is always in a parallel state with the position of the support frame during the downward movement, and thus ensure that the connection position of the placement frame and the support frame will not be deformed due to the settlement force of the new bridge, thereby ensuring the flexibility between the placement frame and the support frame, but also when the placement frame is lowered, with the help of the buffering effect of the spring column and the limiting function of the sleeve, the clamping state of the bottom jacket of the placement frame and the U-shaped steel bar is further stabilized, thereby enhancing the supporting effect of the U-shaped steel bar, so that the U-shaped steel bars on the new bridge and the old bridge will not be deformed due to the settlement dislocation of the new bridge, thereby reducing the deformation damage to the U-shaped steel bars caused by the settlement of the new bridge.

[0021] By setting connecting columns, folding sheds, movable columns and resistance columns in the steel bar detection components, not only can the resistance columns be lifted up when the transverse steel bars fall off so that workers can discover the deformation of the transverse steel bars by observing the resistance columns during the settlement of the new bridge, and then promptly record and determine the locations where the transverse steel bars are severely deformed, but also after the transverse steel bars are deformed and the connecting columns are lifted up, they can always maintain the state of resisting the protrusions, thereby facilitating staff inspection and subsequent steel bar replacement or repair operations.

[0022] By setting up a support frame, a filling hole and a placement frame, the placement frame can not only support and stabilize the U-shaped steel bars and the transverse steel bars, but also eliminate the need for workers to remove the placement frame before pouring concrete. Here, the placement frame acts as a template. Compared with the existing technology, the efficiency of removing the template before pouring concrete is improved, and the construction period is shortened. At the same time, since the expansion coefficient of the material of the support frame and the placement frame is close to that of the concrete material, the support frame and the placement frame can assist in positioning and supporting the U-shaped steel bars and the transverse steel bars when pouring concrete, and can also enhance the overall bearing capacity of the steel bars. Furthermore, during maintenance operations, the material of the support frame and the placement frame is adapted to the concrete material, thereby avoiding electrochemical corrosion or physical incompatibility of the concrete on the interface of the support frame and the placement frame during the maintenance process, thereby extending the service life of the support frame and the placement frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable one skilled in the art to make and use the invention.

[0024] Figure 1 This is a first-person perspective three-dimensional structural diagram of the new formwork system at the widening joint of the bridge under the condition that the old bridge is open to traffic;

[0025] Figure 2 This is a second-angle perspective diagram of the new formwork system at the widening joint of the bridge under the condition that the old bridge is open to traffic;

[0026] Figure 3This is a three-dimensional enlarged structural diagram of welded steel bars, support frames and placement frames;

[0027] Figure 4 This is an exploded, enlarged structural diagram of the support frame and placement frame;

[0028] Figure 5 It is a three-dimensional enlarged structural diagram of the protective cover, cushion and sleeve;

[0029] Figure 6 It is a schematic diagram of the three-dimensional enlarged structure of the sleeve, sleeve washer and spring column;

[0030] Figure 7 It is a three-dimensional enlarged structural diagram of the lifting plate and the connecting column;

[0031] Figure 8 It is a three-dimensional enlarged structural diagram of the movable column, the resistance column and the traction rope;

[0032] Figure 9 for Figure 8 A schematic diagram of the three-dimensional enlarged structure at center A;

[0033] Figure 10 for Figure 8 Schematic diagram of the three-dimensional enlarged structure at point B in the middle;

[0034] Figure 11 It is a three-dimensional enlarged structural diagram of the reinforcing plate 1, the jacket 1 and the weakened part;

[0035] Figure 12 This is a three-dimensional enlarged structural diagram of the buffer pad 2, the reinforcement sleeve and the pressing block.

[0036] Reference numerals:

[0037] 1. Old bridge; 2. New bridge; 3. U-shaped steel bar; 4. Horizontal steel bar; 5. Support frame; 6. Protective sleeve; 7. Buffer pad 1; 8. Sleeve; 9. Sleeve pad; 10. Spring column; 11. Lifting plate; 12. Connecting column; 13. Folding shed; 14. Sliding frame; 15. Movable column; 16. Resistance column; 17. Towing rope; 18. Reinforcement plate 1; 19. Jacket 1; 20. Weakened part; 21. Filling hole; 22. Placement frame; 23. Buffer pad 2; 24. Reinforcement sleeve; 25. Press block; 26. Reinforcement plate 2; 27. Jacket 2.

[0038] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0039] The following, combined with the accompanying drawings and specific embodiments, describes in detail a novel formwork system for widening joints in bridges under traffic conditions, provided by the present invention. It is also noted that, for the sake of completeness, the following embodiments are best and preferred, and those skilled in the art may employ alternative implementations for known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0040] It should be noted that references in the specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes such specific features, structures, or characteristics. In addition, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0041] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0042] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” means not only “directly on” something but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” means not only “on” or “above” something but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0043] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0044] like Figures 1 to 12As shown, an embodiment of the present invention provides a new formwork system for widening joints of bridges under the condition of traffic on the old bridge, including an old bridge 1 and a new bridge 2, the sides of the old bridge 1 and the new bridge 2 are fixedly connected with U-shaped steel bars 3, the surfaces of the U-shaped steel bars 3 are fixedly connected with transverse steel bars 4, the side of the old bridge 1 is installed with a support frame 5, and the side of the new bridge 2 is installed with a placement frame 22; a steel bar detection component, the steel bar detection component is used for rapid detection of steel bars after the settlement of the new bridge 2, the steel bar detection component is connected to the support frame 5, the old bridge 1, the new bridge 2, the U-shaped steel bars 3 and the transverse steel bars 4 are all existing structures, but no further details are given, the U-shaped steel bars 3 on the old bridge 1 and the U-shaped steel bars 3 on the new bridge 2 are welded and fixed by the transverse steel bars 4, and the support frame 5 is integrally clamped It is placed on the side of the old bridge 1, and the placement frame 22 is placed on one side of the new bridge 2 and aligned with the support frame 5. The materials of the support frame 5 and the placement frame 22 are both fiber reinforced plastics, which are close to the expansion coefficient of concrete, more compatible with concrete, and corrosion-resistant. If there are metal parts on the support frame 5 and the placement frame 22, epoxy resin mortar can be applied on the metal material to improve the bonding strength with the concrete. The support frame 5 and the placement frame 22 are both stepped as a whole, and their cross-section is a circular structure with a hollow design inside. Concrete can pass through the internal hollow design structure during the pouring process. The support frame 5 and the placement frame 22 are formed in groups, and the actual length of each group can be selected according to the actual site conditions.

[0045] The workflow for widening the old and new bridges is as follows: first, ensure that the old bridge 1 is open to traffic; then use the existing jackhammer or high-pressure water cutting equipment to chisel out and expose the U-shaped steel bars 3 on the flange plates on both sides of the old bridge 1, and remove rust and clean the concrete residue on the surface to ensure that the subsequent welding and binding processes proceed smoothly; then build the new bridge 2 next to the old bridge 1 according to the designed distance; match the U-shaped steel bars 3 on the flange plates of the new bridge 2 with the U-shaped steel bars 3 on the flange plates of the old bridge 1 one by one (a certain range of upper and lower spacing differences are allowed); then weld and bind the transverse steel bars 4 to the U-shaped steel bars 3, and bind the longitudinal steel bars on the inner wall of the U-shaped steel bars 3 (the number of longitudinal steel bars can be appropriately increased); next, build the formwork before pouring concrete, let it stand for a while, and after the settlement of the new bridge 2 stabilizes, check by random inspection whether there is severe bending or falling off between the U-shaped steel bars 3 and the transverse steel bars 4 on the old and new bridges after settlement; if there is no problem, pour concrete.

[0046] By setting up a steel bar detection component, the transverse steel bars 4 on the new bridge 2 can be located during the settlement of the new bridge 2, and the transverse steel bars 4 that are severely detached or bent will be marked with protrusions, so that the stress conditions of the transverse steel bars 4 in the new bridge 2 can be quickly checked, which facilitates the precise positioning of the random inspection operation. After the new bridge 2 settles, combined with the random inspection operation, the protrusions and marked positions of the steel bar detection component are inspected and repaired in detail, and the position where the transverse steel bars 4 are separated from the U-shaped steel bars 3 is recorded, thereby improving the efficiency and accuracy of the random inspection, reducing the risk of neglecting the detachment of the transverse steel bars 4 and not repairing them, generating tensile stress concentration when the concrete shrinks, reducing the tensile stress value to exceed the tensile strength of the concrete, and effectively avoiding the occurrence of longitudinal or transverse cracks during the subsequent concrete shrinkage process.

[0047] like Figures 4 to 12As shown, the steel bar detection component includes a protective sleeve 6 fixedly connected to the outer wall of the support frame 5, a buffer pad 7 is fixedly connected to the middle position of the support frame 5 near the protective sleeve 6, a sleeve 8 is fixedly connected to the side of the protective sleeve 6 away from the buffer pad 7, the bottom of the inner wall of the sleeve 8 is fixedly connected to a sleeve pad 9, a spring column 10 is fixedly connected to the middle position of the top of the sleeve pad 9, the outer wall of the sleeve 8 is fixedly connected to a lifting plate 11, the outer wall of the top of the lifting plate 11 is fixedly connected to a connecting column 12, a bellows 13 is fixedly connected to the outer wall of the middle position of the connecting column 12, and the connecting column 12 is close to the lifting plate 11. Both sides are fixedly connected with sliding frames 14, and a movable column 15 is installed on the outer wall of the support frame 5 close to the sleeve 8. The end of the movable column 15 away from the support frame 5 is fixedly connected with a resistance column 16, and the outer wall of the resistance column 16 is fixedly connected with a traction rope 17. A reinforcing plate 18 is fixedly connected to the middle position of the bottom of the support frame 5, and a jacket 19 is fixedly connected to the top of the connection between the reinforcing plate 18 and the support frame 5. A weakened portion 20 is provided on both sides of the inner wall of the jacket 19, and a plurality of filling holes 21 are provided on the surface of the support frame 5. The protective sleeve 6 is symmetrically fixedly connected to both sides of the support frame 5. The inner wall is hollow, a slide groove is provided on the outer wall of the sleeve 8, a limit block is provided on the top of the sleeve 8, the sleeve 8 is symmetrically fixedly connected to the two sides of the support frame 5, a weakened notch is provided on the outer wall of the connecting column 12, and the connection between the connecting column 12 and the lifting plate 11 is fixedly connected with a connecting arc plate, the top of the sliding frame 14 is fixedly connected to the two sides of the connecting arc plate, and the bottom of the sliding frame 14 is slidably connected to the slide groove of the sleeve 8. A universal ball is installed at the connection between the movable column 15 and the support frame 5, the reinforcing plate 18 is made of metal, and lightweight grooves are provided on both sides of the jacket 19. The bottom of the inner wall of the jacket 19 is fixedly connected to the bottom of the inner wall of the jacket 19. A soft cushion is installed on the top, and a buffer pad 23 is fixedly connected to the middle position of the placement rack 22. A reinforcement sleeve 24 is fixedly connected to the side of the placement rack 22 away from the buffer pad 23. A pressing block 25 is fixedly connected to the outer wall of the reinforcement sleeve 24. A reinforcing plate 26 is fixedly connected to the middle position of the bottom of the placement rack 22. A jacket 27 is fixedly connected to the top of the connection between the reinforcing plate 26 and the placement rack 22. The shape of the pressing block 25 is adapted to the shape of the inner wall of the sleeve 8. The connecting column 12 and the sliding rack 14 are both slidably connected to the outer wall of the sleeve 8, and are also clamped on the outer wall of the sleeve 8, and are not easy to fall off.

[0048] After the U-shaped reinforcement 3 is welded, the support frame 5 is placed. The staff holds the support frame 5 and tilts it, and places it on the side of the old bridge 1 from top to bottom. Since the bottom of the support frame 5 is L-shaped, it cannot be placed directly vertically, and the support frame 5 needs to be tilted toward the direction of the old bridge 1. After the bottom of the support frame 5 drops below the bottom of the U-shaped reinforcement 3, the tilted support frame 5 is straightened and the support frame 5 is lifted up as a whole. During the lifting process, the jacket 19 will contact and engage with the bottom of the U-shaped reinforcement 3. After the staff observes that the jacket 19 and the bottom of the U-shaped reinforcement 3 are engaged in place, the support frame 5 is released. At this time, under the joint action of the buffer pad 7 and the jacket 19, the support frame 5 will be firmly fixed on the side of the old bridge 1, and then the placement frame 22 is started. Its placement principle is the same as that of the support frame 5, and it needs to be tilted toward the new bridge 2. The support frame 5 and the support frame 22 are fixed and then released. At this time, the support frame 5 and the support frame 22 are connected to form a whole. Since the size of the buffer pad 23 is larger than that of the buffer pad 1 7, the force is more significant. Then use the transverse steel bars 4 to weld and fix the U-shaped steel bars 3 on the sides of the old bridge 1 and the new bridge 2. The transverse steel bars 4 are welded to the bottom of the connecting column 12 and touch the bottom of the connecting column 12. After all the transverse steel bars 4 are welded, let it stand for a while and wait for the settlement of the new bridge 2.

[0049] When the construction of the new bridge 2 begins, it may sink due to its own weight or foundation reasons, while the old bridge 1 has been built for a long time and its settlement has been stable. Therefore, the support frame 5 on the old bridge 1 will not be displaced, and the placement frame 22 on the new bridge 2 will move downward synchronously with the settlement of the new bridge 2. During the movement, the buffer pad 1 7 and the buffer pad 2 23 installed on the support frame 5 and the placement frame 22 can play a good stabilizing role, preventing the support frame 5 and the placement frame 22 from being offset as a whole due to the settlement of the new bridge 2. At the same time, the jacket 1 19 and the jacket 2 27 will assist the buffer pad 1 7 and the buffer pad 2 23 to stabilize the position of the support frame 5 and the placement frame 22. In addition, the jacket 2 27 is located on the reinforcing plate 2 26. The reinforcing plate 26 is made of metal and is larger in size and can withstand greater pressure. When the new bridge 2 sinks and the placement frame 22 moves down accordingly, the pressing block 25 will move downward synchronously and press on the spring column 10 on the inner wall of the sleeve 8, driving the spring column 10 to compress downward, thereby ensuring that the placement frame 22 will not be excessively deformed due to excessive resistance under the drive of the settlement of the new bridge 2. By arranging the sleeve 8, the sleeve pad 9, and the spring column 10 in the steel bar detection assembly, it is ensured that the connection position of the placement frame 22 and the support frame 5 will not be deformed due to the problem of the settlement force of the new bridge 2, thereby ensuring the flexibility between the placement frame 22 and the support frame 5, and when the placement frame 22 descends, with the help of the buffering effect of the spring column 10 and the limiting function of the sleeve 8, the clamping state of the bottom jacket 27 of the placement frame 22 and the U-shaped steel bar 3 is further stabilized, thereby enhancing the U-shaped The supporting effect of the steel bars 3, so that the U-shaped steel bars 3 on the new bridge 2 and the old bridge 1 will not be deformed due to the settlement and dislocation of the new bridge 2, reducing the deformation damage of the U-shaped steel bars 3 caused by the settlement of the new bridge 2. The above is the normal settlement process of the new bridge 2. The transverse steel bars 4 are horizontally welded on the outer walls of the U-shaped steel bars 3 of the old bridge 1 and the new bridge 2 in the initial state. As the new bridge 2 descends, the transverse steel bars 4 gradually change from the original horizontal state to a state with one end tilted downward. The transverse steel bars 4 will bend in the middle or even fall off from the U-shaped steel bars 3 because the stress of the settlement is greater than the stress of welding. Combined with the actual situation, there are a large number of steel bars distributed on the sides of the old bridge 1 and the new bridge 2. Whether it is bending or even falling off, when it starts to happen, it will conflict with the transverse steel bars 4. The connecting column 12 will deviate together with the transverse reinforcement 4, because during the settlement operation, the reinforcement is allowed to bend at a certain angle, and the middle position of the connecting column 12 is provided with a bellows 13. When the transverse reinforcement 4 bends, the connecting column 12 is also lifted upward, and because the U-shaped reinforcement 3 is in contact with the bottom of the connecting column 12 in the initial state, the connecting column 12 will be lifted upward synchronously when the transverse reinforcement 4 bends, and the bending degree of the reinforcement will also be synchronized to the degree of lifting of the connecting column 12. When the connecting column 12 is lifted upward, it will also touch the resistance column 16, so that the resistance column 16 is also lifted upward synchronously. The movable column 15 is connected to the resistance column 16, and a universal ball is provided at the connection between the movable column 15 and the support frame 5.When the cross bar 4 falls off, the cross bar 4 will fall off completely from the U-shaped bar 3, and one end of the cross bar 4 is still welded and fixed on the U-shaped bar 3, and the other end falls off. In either case, at the moment when the cross bar 4 falls off from the U-shaped bar 3, the stress on the cross bar 4 is greater than the welding stress between the cross bar 4 and the U-shaped bar 3, and the settlement direction is downward, so that it will quickly tilt upward under the action of stress inertia, and the tilting will directly hit the bottom of the connecting column 12, thereby causing the connecting column 12 to lift up under the action of the hitting force, and drive the friction column 16 upward synchronously. Both of these methods will cause the connecting column 12 to deflect upward, and the end of the connecting column 12 is fixed to the top of the lifting plate 11. If the middle position of the connecting column 12 is lifted upward, its two ends will move downward. The movable bellows 13 provided at the middle of the connecting column 12 will make the lifting effect of the connecting column 12 more obvious. A placement slot is provided at the top of the interference column 16 for placing different types of conspicuous objects. By virtue of the height difference of the objects, it is possible to quickly determine which group of transverse reinforcements 4 has problems. By arranging the connecting column 12, bellows 13, movable column 15 and interference column 16 in the reinforcement detection assembly, not only can the interference column 16 be lifted up when the transverse reinforcement 4 falls off, so that workers can observe the interference column 16 to discover the deformation of the transverse reinforcement 4 during the settlement of the new bridge 2, and then promptly record and determine the location where the transverse reinforcement 4 is severely deformed, but also the state can be kept stable after the transverse reinforcement 4 lifts up the connecting column 12, thereby enhancing the prominent effect of the interference column 16, making it convenient for workers to find out in time, and avoid the inability to continuously lift the connecting column 12 after the transverse reinforcement 4 falls off, which leads to the resetting of the interference column 16, thereby affecting the replacement and welding of the transverse reinforcement 4.

[0050] It is worth mentioning that the support frame 5 can adjust its own length according to the actual length of the bridge, and a connecting column 12 of appropriate length can be added in the middle position of the support frame 5. In order to improve the accuracy of inspecting each group of transverse steel bars 4, different numbers of bellows 13 are linearly and evenly distributed on the surface of the connecting column 12. A group of movable columns 15, resistance columns 16 and traction ropes 17 are fixedly distributed at both ends of the connecting column 12, which can ensure that the resistance columns 16 can be effectively lifted and that the middle position of the connecting column 12 can be lifted. In summary, the two ends of the connecting column 12 rely on the lifting of the resistance columns 16, and the middle position relies on the lifting of the bellows 13.

[0051] After the settlement operation is completed, the steel bar detection component can be used to quickly locate the problematic steel bar group and observe the bending condition of the transverse steel bar 4. The staff can choose to use tools to restore the bent transverse steel bar 4 to its original state or replace the transverse steel bar 4 according to the actual situation. The transverse steel bar 4 that has fallen off can be re-welded. In addition, the support frame 5 and the placement frame 22 are connected by the sleeve 8 and the pressing block 25. Sufficient space is reserved in the middle to facilitate the staff to weld and repair the transverse steel bar 4. Since the support frame 5 and the placement frame 22 are mainly made of fiber reinforced plastic, which is close to the expansion coefficient of concrete, and filling holes 21 are opened in a small part of the support frame 5 and the placement frame 22, when pouring concrete, the concrete will enter the inner cavity of the support frame 5 and the placement frame 22 through the filling holes 21, so that the support frame 5 and the placement frame 22 can be poured together with the U-shaped steel bar 3 and the transverse steel bar 4. By setting the support frame 5, the filling holes 21 and the placement frame Frame 22, wherein the support frame 5 and the placement frame 22 can not only support and stabilize the U-shaped steel bars 3 and the transverse steel bars 4, but also eliminate the need for workers to remove the support frame 5 and the placement frame 22 before pouring concrete. Here, the support frame 5 and the placement frame 22 act as formwork. Compared with the existing technology, the efficiency of removing the formwork before pouring concrete is improved, and the construction period is shortened. At the same time, since the material of the support frame 5 and the placement frame 22 is close to the expansion coefficient of the concrete material, the support frame 5 and the placement frame 22 can assist in positioning and supporting the U-shaped steel bars 3 and the transverse steel bars 4 when pouring concrete, and can also enhance the overall bearing capacity of the steel bars. Furthermore, during maintenance operations, the material of the support frame 5 and the placement frame 22 is adapted to the concrete material, thereby avoiding electrochemical corrosion or physical incompatibility of the concrete on the material interface of the support frame 5 and the placement frame 22 during the maintenance process, thereby extending the service life of the support frame 5 and the placement frame 22.

[0052] The working principle of the technical solution provided by the present invention is as follows:

[0053] The workflow for widening the old and new bridges is as follows: first, ensure that the old bridge 1 is open to traffic; then use the existing jackhammer or high-pressure water cutting equipment to chisel out and expose the U-shaped steel bars 3 on the flange plates on both sides of the old bridge 1, and remove rust and clean the concrete residue on the surface to ensure that the subsequent welding and binding processes proceed smoothly; then build the new bridge 2 next to the old bridge 1 according to the designed distance; match the U-shaped steel bars 3 on the flange plates of the new bridge 2 with the U-shaped steel bars 3 on the flange plates of the old bridge 1 one by one (a certain range of upper and lower spacing differences are allowed); then weld and bind the transverse steel bars 4 to the U-shaped steel bars 3, and bind the longitudinal steel bars on the inner wall of the U-shaped steel bars 3 (the number of longitudinal steel bars can be appropriately increased); next, build the formwork before pouring concrete, let it stand for a while, and after the settlement of the new bridge 2 stabilizes, check by random inspection whether there is severe bending or falling off between the U-shaped steel bars 3 and the transverse steel bars 4 on the old and new bridges after settlement; if there is no problem, pour concrete.

[0054] The support frame 5 is placed before welding the U-shaped steel bar 3. The staff holds the support frame 5 and tilts it, and places it on the side of the old bridge 1 from top to bottom. Since the bottom of the support frame 5 is L-shaped, it cannot be placed directly vertically, and the support frame 5 as a whole needs to be tilted toward the direction of the old bridge 1. After the bottom of the support frame 5 drops below the bottom of the U-shaped steel bar 3, the tilted support frame 5 is straightened and the support frame 5 as a whole is lifted upward. During the lifting process, the sleeve 19 will contact and engage with the bottom of the U-shaped steel bar 3. After the staff observes that the sleeve 19 and the bottom of the U-shaped steel bar 3 are engaged in place, the support frame 5 is released. At this time, under the joint action of the buffer pad 7 and the sleeve 19, the support frame 5 will be firmly fixed on the side of the old bridge 1, and then the placement frame 22 is started. Its placement principle is the same as that of the support frame 5, and it needs to be placed in the direction of the new bridge 2. Move tilted from top to bottom. During the movement of the placement frame 22, the pressing block 25 needs to be aligned with the position of the sleeve 8 so that the pressing block 25 can slide on the inner wall of the sleeve 8. After the bottom of the placement frame 22 is lower than the bottom of the U-shaped steel bar 3 on the new bridge 2, the placement frame 22 is straightened and lifted upward. At the same time, observe whether the jacket 27 is engaged with the bottom position of the U-shaped steel bar 3 on the new bridge 2. After the placement frame 22 is fixed, it is released. At this time, the support frame 5 and the placement frame 22 are engaged to form a whole. Since the size of the buffer pad 23 is larger than the size of the buffer pad 1 7, the force is more significant. Then use the transverse steel bars 4 to weld and fix the U-shaped steel bars 3 on the sides of the old bridge 1 and the new bridge 2. The transverse steel bars 4 are welded to the bottom of the connecting column 12 and touch the bottom of the connecting column 12. After all the transverse steel bars 4 are welded, let it stand for a while and wait for the settlement of the new bridge 2.

[0055] When the construction of the new bridge 2 begins, it may sink due to its own weight or foundation reasons. The old bridge 1 has been built for a long time and its settlement has been stable. Therefore, the support frame 5 on the old bridge 1 will not move, and the placement frame 22 on the new bridge 2 will move downward synchronously with the settlement of the new bridge 2. During the movement, the buffer pad 1 7 and the buffer pad 23 installed on the support frame 5 and the placement frame 22 can play a good stabilizing role, preventing the support frame 5 and the placement frame 22 from being offset as a whole due to the settlement of the new bridge 2. At the same time, the jacket 1 19 and the jacket 2 27 will assist the buffer pad 1 7 and the buffer pad 23 to stabilize the support frame 5 and the placement frame 22. The second reinforcing plate 26 is made of metal and has a larger size, which can withstand greater pressure. When the new bridge 2 sinks and the placement frame 22 moves down, the pressing block 25 will move downward synchronously and press on the spring column 10 on the inner wall of the sleeve 8, driving the spring column 10 to compress downward, thereby ensuring that the placement frame 22 will not be excessively deformed due to excessive resistance under the influence of the settlement of the new bridge 2. The above is the normal settlement process of the new bridge 2. In the initial state, the transverse steel bar 4 is horizontally welded to the outer wall of the U-shaped steel bar 3 of the old bridge 1 and the new bridge 2. As the new bridge 2 descends, the transverse steel bar 4 From the original horizontal state, it gradually changes to a state with one end tilted downward. The transverse reinforcement 4 will bend in the middle or even fall off from the U-shaped reinforcement 3 because the stress of settlement is greater than the stress of welding. In view of the actual situation, there are a large number of reinforcements distributed on the sides of the old bridge 1 and the new bridge 2. Whether it is bending or even falling off, when it starts to happen, the connecting column 12 that conflicts with the transverse reinforcement 4 will be displaced together with the transverse reinforcement 4. Because during the settlement operation, the reinforcement is allowed to bend at a certain angle, and because the middle position of the connecting column 12 is provided with a bellows 13, when the transverse reinforcement 4 bends, The connecting column 12 is also lifted upward, and because the U-shaped steel bar 3 is in contact with the bottom of the connecting column 12 in the initial state, the connecting column 12 will be lifted upward synchronously when the transverse steel bar 4 is bent, and the bending degree of the steel bar will be synchronized to the degree of lifting of the connecting column 12. When the connecting column 12 is lifted upward, it will also touch the resistance column 16, so that the resistance column 16 is also lifted upward synchronously. The movable column 15 and the resistance column 16 are connected to each other. A universal ball is provided at the connection between the movable column 15 and the support frame 5, so that the movable column 15 can move arbitrarily, causing the resistance column 16 to be in a lifted state.When the transverse reinforcement 4 falls off, there are two types of falling off: the transverse reinforcement 4 completely falls off from the U-shaped reinforcement 3, and the other type is that one end of the transverse reinforcement 4 is still welded and fixed on the U-shaped reinforcement 3, and the other end falls off. No matter which state, at the moment the transverse reinforcement 4 falls off from the U-shaped reinforcement 3, the stress on the transverse reinforcement 4 is greater than the welding stress of the transverse reinforcement 4 and the U-shaped reinforcement 3, and the settlement direction is downward, so that under the action of stress inertia, it will quickly warp upward, and the warping will directly hit the bottom of the connecting column 12, thereby causing the connecting column 12 to lift up under the action of the hitting force. , and drives the interference column 16 upward synchronously. Both methods will cause the connecting column 12 to be lifted upward. The ends of the connecting column 12 are fixed to the top of the lifting plate 11. If the middle position of the connecting column 12 is lifted upward, its two ends will move downward. The movable bellows 13 provided in the middle of the connecting column 12 will make the lifting effect of the connecting column 12 more obvious. A placement slot is provided at the top of the interference column 16 for placing different types of conspicuous objects. By taking advantage of the height difference of the objects, it is possible to quickly determine which group of transverse steel bars 4 has a problem.

[0056] After the settlement operation is completed, the steel bar detection component can be used to quickly locate the problematic steel bar group and observe the bending condition of the transverse steel bar 4. The staff can choose to use tools to restore the bent transverse steel bar 4 to its original state or replace the transverse steel bar 4 according to the actual situation. The transverse steel bar 4 that has fallen off can be re-welded. In addition, the support frame 5 and the placement frame 22 are connected by the sleeve 8 and the pressing block 25. Sufficient space is reserved in the middle to facilitate the staff to weld and repair the transverse steel bar 4. Since the support frame 5 and the placement frame 22 are mainly made of fiber reinforced plastic, the expansion coefficient is close to that of concrete, and filling holes 21 are opened in a small number of positions of the support frame 5 and the placement frame 22, when pouring concrete, the concrete will enter the inner cavity of the support frame 5 and the placement frame 22 through the filling hole 21, so that the support frame 5 and the placement frame 22 can be poured together with the U-shaped steel bar 3 and the transverse steel bar 4.

[0057] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail below in connection with the preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A new formwork system for widening joints of bridges under traffic conditions of old bridges, including old bridges and new bridges, characterized in that: The sides of the old bridge and the new bridge are both fixedly connected with U-shaped steel bars, and the surfaces of the U-shaped steel bars are fixedly connected with transverse steel bars. The sides of the old bridge are installed with support frames, and the sides of the new bridge are installed with placement frames. A steel bar detection component is used for rapid detection of steel bars after the new bridge settles, and the steel bar detection component is connected to the support frame.

2. The new formwork system for widening joints of bridges under traffic conditions of old bridges according to claim 1 is characterized in that: The steel bar detection component includes a protective sleeve fixedly connected to the outer wall of the support frame, a buffer pad 1 is fixedly connected to the middle position of the support frame near the protective sleeve, and a sleeve is fixedly connected to the side of the protective sleeve away from the buffer pad 1.

3. The new formwork system for widening joints of bridges under traffic conditions of old bridges according to claim 2 is characterized in that: The bottom of the inner wall of the sleeve is fixedly connected with a sleeve pad, the middle position of the top of the sleeve pad is fixedly connected with a spring column, and the outer wall of the sleeve is fixedly connected with a lifting plate.

4. The new formwork system for widening joints of bridges under traffic conditions of old bridges according to claim 3 is characterized in that: The outer wall of the top of the lifting plate is fixedly connected to a connecting column, a bellows is fixedly connected to the outer wall at the middle position of the connecting column, sliding frames are fixedly connected to both sides of the connecting column close to the lifting plate, a movable column is installed on the outer wall of the support frame close to the sleeve, a resistance column is fixedly connected to the end of the movable column away from the support frame, and a traction rope is fixedly connected to the outer wall of the resistance column.

5. The new formwork system for widening joints of bridges under traffic conditions of old bridges according to claim 4 is characterized in that: A reinforcing plate 1 is fixedly connected to the middle position of the bottom of the support frame, a jacket 1 is fixedly connected to the top of the connection between the reinforcing plate 1 and the support frame, weakened portions are provided on both sides of the inner wall of the jacket 1, and a plurality of filling holes are provided on the surface of the support frame.

6. The new formwork system for widening joints of bridges under traffic conditions of old bridges according to claim 2 is characterized in that: A second buffer pad is fixedly connected to the middle position of the placement rack, a reinforcement sleeve is fixedly connected to the side of the placement rack away from the second buffer pad, a pressing block is fixedly connected to the outer wall of the reinforcement sleeve, a second reinforcement plate is fixedly connected to the middle position of the bottom of the placement rack, and a second jacket is fixedly connected to the top of the connection between the second reinforcement plate and the placement rack.

7. The new formwork system for widening joints of bridges under traffic conditions of old bridges according to claim 2 is characterized in that: The protective sleeve is symmetrically fixedly connected to both sides of the support frame, the inner wall of the sleeve is hollow, a sliding groove is opened on the outer wall of the sleeve, a limiting block is set on the top of the sleeve, and the sleeve is symmetrically fixedly connected to both sides of the support frame.

8. The new formwork system for widening joints of bridges under traffic conditions of old bridges according to claim 4 is characterized in that: A weakened notch is provided on the outer wall of the connecting column, a connecting arc plate is fixedly connected to the connection between the connecting column and the lifting plate, the top of the sliding frame is fixedly connected to both sides of the connecting arc plate, the bottom of the sliding frame is slidably connected to the sliding groove of the sleeve, and a universal ball is installed at the connection between the movable column and the support frame.

9. The new formwork system for widening joints of bridges under traffic conditions of old bridges according to claim 5 is characterized in that: The reinforcing plate 1 is made of metal, lightweight grooves are provided on both sides of the jacket 1, and a soft pad is installed on the bottom of the inner wall of the jacket 1.

10. The new formwork system for widening joints of bridges under traffic conditions of old bridges according to claim 6 is characterized in that: The shape of the pressing block is adapted to the shape of the inner wall of the sleeve.

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