A structure for widening old bridge body and method thereof

Abstract

The application discloses a widening structure for new and old bridge bodies, which comprises a new bridge body and an old bridge body, a widening gap is arranged between the new bridge body and the old bridge body, a stainless steel plate is arranged at the upper end of the widening gap, an old bridge asphalt layer is arranged on the upper layer of the old bridge body, a new bridge asphalt layer is arranged on the upper layer of the new bridge body, and an elastic asphalt layer is arranged between the old bridge asphalt layer and the new bridge asphalt layer. The application further discloses a method for widening the new and old bridge bodies, the linear of widening is formulated, the area for laying the high-toughness concrete layer of the old bridge and the area for laying the high-toughness concrete layer of the new bridge are chiseled out, the epoxy interface agent is brushed, the pouring and forming are carried out, the pavement asphalt layer is paved, the asphalt groove is cut, and the elastic asphalt layer is formed. The application provides the widening structure for the new and old bridge bodies and the method, which can avoid the repulsion phenomenon between the new bridge body and the old bridge body, and guarantee the stability and safety of the widened bridge body.

Description

Technical Field

[0001] This invention relates to the field of bridges, specifically to a structure and method for widening old and new bridge structures. Background Technology

[0002] Many lanes are gradually becoming unable to meet the traffic flow demands, requiring lane widening or the addition of lanes. However, widening conventional road lanes often impacts other structures along the road, involving additional costs such as demolition. As a result, elevated bridges are often added above the road lanes to solve traffic flow problems. But in areas where elevated bridges already exist, solving traffic flow issues becomes extremely difficult.

[0003] Due to the aforementioned problems, a better technical solution is to widen the elevated bridge to address traffic flow demands. However, there are structural and material discrepancies between the new and old bridge sections. If a connecting splicing structure is used during the assembly process, it can easily cause repulsion between the new and old bridge sections, which is detrimental to the stability and safety of the widened bridge. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a structure and method for widening new and old bridge bodies that can avoid the repulsion between the new bridge body and the old bridge body and ensure the stability and safety of the widened bridge body.

[0005] The technical solution adopted by this invention to solve the above problems is as follows: a structure for widening old and new bridge bodies, comprising a new bridge body and an old bridge body, wherein a widening gap is provided between the new bridge body and the old bridge body, the upper part of the main body of the old bridge body is provided with an old bridge concrete layer and an old bridge high-toughness concrete layer, the old bridge high-toughness concrete layer is provided on the side of the old bridge body near the new bridge body, the upper part of the main body of the new bridge body is provided with a new bridge concrete layer and a new bridge high-toughness concrete layer, the new bridge high-toughness concrete layer is provided on the side of the new bridge body near the old bridge body, and the top height of the old bridge high-toughness concrete layer is the same as that of the new bridge body. The top of the high-toughness concrete layer is set at the same height as the horizontal plane. A stainless steel plate is provided at the upper end of the widened gap. One end of the stainless steel plate is set on the high-toughness concrete layer of the old bridge, and the other end of the stainless steel plate is set on the high-toughness concrete layer of the new bridge. The uppermost layer of the old bridge body is provided with the old bridge asphalt layer, and the uppermost layer of the new bridge body is provided with the new bridge asphalt layer. An elastic asphalt layer is provided between the old bridge asphalt layer and the new bridge asphalt layer. The elastic asphalt layer is covered on the stainless steel plate. The old bridge asphalt layer and the new bridge asphalt layer are poured synchronously and integrally after the widening alignment of the new bridge body and the old bridge is completed.

[0006] Compared with existing technologies, the advantages of this invention are as follows: A widened gap is provided between the new and old bridge sections. This widened gap design provides sufficient deformation space for both the new and old bridge sections when they undergo thermal expansion and contraction due to weather conditions. Furthermore, the deformations of the new and old bridge sections are independent and do not affect each other, thus preventing dangerous phenomena such as cracking due to different deformations. The high-toughness concrete layer of the old bridge section is located on the side of the old bridge section closest to the new bridge section, and the high-toughness concrete layer of the new bridge section is located on the side of the new bridge section closest to the old bridge section. The top heights of the high-toughness concrete layers of the old and new bridge sections are set at the same horizontal level. This ensures the horizontality of the stainless steel plate installation and the consistency of the base material at the widened connection point. Because the pouring time and materials of the high-toughness concrete layers of the old and new bridge sections are the same, consistent deformation is guaranteed. Therefore, an elastic asphalt layer is then poured on top of the high-toughness concrete layers of the old and new bridge sections. The construction method ensures the structural stability of the elastic asphalt layer, preventing inconsistent deformation and breakage caused by the elastic asphalt layer being placed on the new and old bridge bodies. The elastic asphalt layer itself also possesses better deformation adaptability, thus guaranteeing the quality of the widened bridge deck and reducing the likelihood of breakage. The stainless steel plate design prevents asphalt from flowing into the widening gaps during asphalt layer pouring, ensuring the integrity of the widening gaps. Simultaneous laying of the old and new bridge asphalt layers after the widening alignment of the new and old bridge bodies ensures equal height between the old and new asphalt layers and reduces the number of templates used during asphalt pouring. If the old and new bridge asphalt layers were laid in separate areas simultaneously, the number of templates used to shape the old and new asphalt layers would double, and it would be difficult to maintain equal height between the old and new asphalt layers during subsequent compaction. Therefore, the method of first pouring the asphalt layer integrally and then chiseling out the pouring area for the elastic asphalt layer is adopted.

[0007] As an improvement of the present invention, the old bridge concrete layer and the old bridge high-toughness concrete layer are connected by the old bridge steel reinforcement frame, and the new bridge concrete layer and the new bridge high-toughness concrete layer are connected by the new bridge steel reinforcement frame. Through this improvement, the connection between the old bridge high-toughness concrete layer and the old bridge concrete layer on the old bridge body and the connection between the new bridge high-toughness concrete layer and the new bridge concrete layer on the new bridge body can be guaranteed.

[0008] As an improvement of the present invention, the widened gap includes an expansion gap and a high-toughness concrete extension layer of the old bridge. The stainless steel plate is disposed on the expansion gap. The high-toughness concrete extension layer of the old bridge is integrally formed with the high-toughness concrete layer of the old bridge. A tough steel reinforcement frame is provided inside the high-toughness concrete extension layer of the old bridge. The tough steel reinforcement frame includes a connecting section for welding to the main steel reinforcement frame of the old bridge body and an unfolding section for ensuring the structural stability of the high-toughness concrete extension layer of the old bridge. The unfolding section is hook-shaped, firstly downward and then upward. Through this improvement, firstly, because the old bridge body has a long service life, its structural strength will decrease, and its deformation... The magnitude of the expansion is difficult to calculate precisely. However, by designing the high-toughness concrete extension layer of the old bridge as an integral part of the old bridge structure, and by placing the high-toughness concrete extension layer at the end of the old bridge structure near the new bridge structure, the deformation of the high-toughness concrete towards the new bridge structure can be used as a new deformation standard for calculation. This allows for a better design of the size of the expansion gap, preventing the new and old bridge structures from directly colliding after expansion. This ensures the stability and safety of the old bridge structure after it is widened by the new bridge structure. The design of the tough steel reinforcement frame ensures the stability of the high-toughness concrete in the extension layer after molding, making it less prone to falling off or breaking.

[0009] As an improvement of this invention, a drip groove is provided at the bottom of the high-toughness concrete extension layer of the old bridge, and a drip rubber strip is provided at the bottom of the end of the new bridge body near the old bridge body. A water collection box is provided at the lower end of the widened gap to collect the water dripping from the drip groove and the drip rubber strip. A drain pipe is provided at the bottom of the water collection box to drain the water in the water collection box to the ground. Through this improvement, the old bridge body may not have been designed with a drip groove, resulting in strong water diffusion after water seepage in the old bridge body, which is not conducive to the service strength of the bridge body. After the improvement of the concrete extension layer, the design of drip grooves was added. Water that seeps into the old bridge body is removed from the old bridge body along the drip grooves, avoiding the spread of water seepage on the old bridge body. Therefore, it is not necessary to process drip grooves or drip rubber strips on the old bridge body. During the molding process of the new bridge body, the drip rubber strip structure is directly fixed to solve the problem of water seepage spread on the new bridge body. Then, through the design of water collection boxes and drainage pipes, the seepage water from the new bridge body and the old bridge body is collected and guided into the ground, so as not to affect the use of the area under the bridge body.

[0010] As an improvement of the present invention, an epoxy interface agent is provided between the old bridge concrete layer and the old bridge high-toughness concrete layer, between the main body of the old bridge and the old bridge high-toughness concrete layer, between the new bridge concrete layer and the new bridge high-toughness concrete layer, and between the main body of the new bridge and the new bridge high-toughness concrete layer. Through this improvement, the adhesion between the old bridge concrete layer and the old bridge high-toughness concrete layer, between the main body of the old bridge and the old bridge high-toughness concrete layer, between the new bridge concrete layer and the new bridge high-toughness concrete layer, and between the main body of the new bridge and the new bridge high-toughness concrete layer is guaranteed during the casting process.

[0011] As an improvement of the present invention, the old bridge body is provided with multiple old bridge expansion joints along the laying direction of the old bridge body, and the old bridge expansion joints are provided with old bridge expansion joint steel. The new bridge body is provided with multiple new bridge expansion joints along the laying direction of the new bridge body, and the new bridge expansion joints are provided with new bridge expansion joint steel. The old bridge expansion joints and the new bridge expansion joints are staggered. The end of the new bridge expansion joint near the old bridge body and the end of the old bridge expansion joint near the new bridge body are connected by a widening expansion joint. The widening expansion joint is located on the centerline of the elastic asphalt layer, and the widening expansion joint is provided with a widening expansion joint steel. However, during the widening process of the old and new bridge bodies, the gap between two adjacent old bridge expansion joints and the gap between two adjacent new bridge expansion joints may deviate, or the dimensional deviation may be caused by the curve design of the viaduct, thereby causing the new bridge extension on the new bridge body to be affected. The misalignment between the contraction joints and the old bridge expansion joints on the new bridge structure can cause dimensional deviations in deformation between the new and old bridge structures, posing a risk of fracture in the elastic asphalt layer between them. By widening the expansion joints and connecting them to the old ones, the design prioritizes areas prone to fracture, eliminating the previously irregular and easily spreading fractures. Instead, it creates a relative offset between the new and old bridge structures on either side of the widened expansion joint, preventing random fractures and ensuring the quality and safety of the widened bridge structure. Furthermore, the use of steel sections for the new, old, and widened expansion joints ensures the smoothness of the bridge surface, preventing road surface depressions caused by the design of these sections, thus avoiding impacts on driving experience and safety.

[0012] As an improvement of the present invention, a new bridge fixing frame for supporting one side of the expansion joint steel is provided at one end of the elastic asphalt layer near the new bridge body, and an old bridge fixing frame for supporting the other side of the expansion joint steel is provided at one end of the elastic asphalt layer near the old bridge body. The bottom end of the new bridge fixing frame is fixedly connected to the main body of the new bridge body, and the bottom end of the old bridge fixing frame is fixedly connected to the main body of the old bridge body. Through this improvement, the uniformity and stability of the connection of the expansion joint steel on the expansion joint are ensured, and it will not be affected by only one side of the new bridge body or the old bridge body.

[0013] The technical solution adopted by this invention to solve the above problems is a method for widening old and new bridge bodies, used for constructing a structure for widening old and new bridge bodies, the steps of which are as follows: S1: Based on the widening requirements of the old and new bridge bodies, measure the elevation of the crash barriers on one or both sides of the old bridge body to be widened, and redefine the alignment of the bridge deck after widening based on the elevation. S2: Use wire cutting to dismantle the crash barrier; S3: Based on the elevation position, use manual chiseling to chisel out the area on the old bridge body to lay the high-toughness concrete layer of the old bridge and the area on the new bridge body to lay the high-toughness concrete layer of the new bridge, ensuring that the thickness of the elastic asphalt layer is not less than 120mm, and use wind welding to cut off the excess steel bars after the demolition of the crash barrier. S4: Apply epoxy interface agent to the connection surfaces of the old bridge concrete layer and the old bridge high-toughness concrete layer, the connection surfaces of the old bridge body and the old bridge high-toughness concrete layer, the connection surfaces of the new bridge concrete layer and the new bridge high-toughness concrete layer, and the connection surfaces of the new bridge body and the new bridge high-toughness concrete layer. S5: Casting and shaping of the high-toughness concrete layer for the old bridge and the high-toughness concrete layer for the new bridge; S6: Place aluminum foil waterproof membrane at the top of the widened gap; S7: Cover the aluminum foil waterproof membrane with a 6mm thick stainless steel plate, with the stainless steel plate placed on both sides of the old bridge's high-toughness concrete layer and the new bridge's high-toughness concrete layer, respectively. S8: Lay the asphalt pavement layer, which includes the asphalt pavement layer for new bridges and the asphalt pavement layer for old bridges, and compact it with a road roller. S9: Draw a center line on the asphalt layer of the road surface along the widening gap, and then draw construction lines 200mm away from the asphalt layer of the new bridge and 200mm away from the asphalt layer of the old bridge, respectively, based on the center line. S10: Cut the asphalt layer of the road surface according to the two construction lines, cutting down to the high-toughness concrete layer of the old bridge and the high-toughness concrete layer of the new bridge to form asphalt grooves. S11: Clean the asphalt tank and apply epoxy interface agent to the bottom and sides of the asphalt tank; S12: Aggregate and elastic materials are put into a heated container at a weight ratio of 1:2 and heated and mixed together with asphalt and concrete. The paving operation is completed before the epoxy interface agent cures to form an elastic asphalt layer, which is then compacted by a road roller.

[0014] Compared with the prior art, the advantages of this invention are as follows: To ensure the flatness of the new bridge body and the old bridge body during the widening process, in step S5, areas for laying the high-toughness concrete layer of the old bridge body are chiseled out on the old bridge body, and areas for laying the high-toughness concrete layer of the new bridge body are chiseled out on the new bridge body. Then, in step S5, the concrete is poured and molded. Since both sides of the widening gap are high-toughness concrete layers, with the same material and both being newly formed structures, it is easier to judge the magnitude of thermal expansion and contraction. Steps S6 and S7 facilitate the smooth molding of asphalt, avoiding depressions in the overall asphalt layer due to the design of the widening gap. Step S8 ensures that the new bridge body maintains a high degree of flatness with the old bridge body after widening, thereby ensuring driving safety after the bridge widening is completed. Steps S9-S12 complete the pouring of the elastic asphalt layer. The elastic asphalt layer itself also has better deformation adaptability, thereby ensuring the quality of the widened bridge deck and making it less prone to cracking. Because the cost of the elastic asphalt layer is much higher than the total material cost of the new bridge asphalt layer and the old bridge asphalt layer, it is not advisable to directly adopt the scheme of using the elastic asphalt layer for the entire bridge deck. At the same time, the strength formed by the elastic asphalt layer is also weaker than that of the new bridge asphalt layer and the old bridge asphalt layer, and it is not suitable for the entire bridge deck. In addition, due to the limitations of the operation cycle and the fixed template, the pouring process of the elastic asphalt layer adopts the method of first completing the integrated paving of the new bridge asphalt layer and the old bridge asphalt layer, and then chiseling out the paving area of ​​the elastic asphalt layer for pouring and shaping.

[0015] As an improvement of the present invention, in step S5, before pouring and forming the high-toughness concrete layer of the old bridge and the high-toughness concrete layer of the new bridge, the toughness steel reinforcement frame is welded to the main steel reinforcement of the old bridge body. Through the improvement, it is ensured that the toughness steel reinforcement frame is formed in the high-toughness concrete layer of the old bridge, thereby ensuring the strength and quality of the high-toughness concrete layer of the old bridge after it is formed.

[0016] As an improvement of the present invention, the expansion joints of the old bridge and the new bridge are staggered. The end of the new bridge expansion joint near the old bridge body and the end of the old bridge expansion joint near the new bridge body are connected by a widened expansion joint. In step S5, the old bridge fixing frame is fixedly connected to the old bridge body. Before step S12, the widened expansion joint steel is fixed on the new bridge fixing frame and the old bridge fixing frame. Templates are installed on both sides of the widened expansion joint. Through the above improvement, the old bridge fixing frame is formed in the high-toughness concrete layer of the old bridge to ensure the fixing stability of the widened expansion joint steel. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the widened gap of the present invention.

[0018] Figure 2 This is a top view schematic diagram of the resilient steel bar frame connection structure of the present invention.

[0019] Figure 3 This is a schematic diagram of another embodiment of the resilient steel bar frame of the present invention.

[0020] Figure 4 This is a schematic diagram of the connection structure between the old bridge expansion joint steel and the new bridge expansion joint steel, which are distributed in a staggered manner according to the present invention.

[0021] Figure 5 This is a schematic diagram of the cross-sectional structure of the expansion joint of the present invention.

[0022] Figure 6 This is a top view of the structure of the present invention before concrete and asphalt are laid on the new or old bridge body.

[0023] The diagram shows: 1. New bridge body; 1.1 New bridge concrete layer; 1.2 New bridge high-toughness concrete layer; 1.3 Drip rubber strip; 1.4 New bridge expansion joint steel; 2. Old bridge body; 2.1 Old bridge concrete layer; 2.2 Old bridge high-toughness concrete layer; 2.3 Drip groove; 2.4 Old bridge expansion joint steel; 2.5 Main steel reinforcement frame; 2.6 Rebar holes; 3. Widened gap; 3.1 Expansion gap; 3.2 Old bridge high-toughness concrete extension layer; 4. Stainless steel plate; 5. Old bridge asphalt layer; 6. New bridge asphalt layer; 7. Elastic asphalt layer; 8. Old bridge steel reinforcement frame; 9. New bridge steel reinforcement frame; 10. Tough steel. Frame, 10.1 Connecting section, 10.2 Expanding section, 10.3 Connecting frame reinforcement, 10.4 Standardized frame reinforcement, 11 Water collection box, 12 Drainage pipe, 13 Epoxy interface agent, 14 Widening expansion joint, 14.1 Widening expansion joint steel, 14.2 Sealing tape, 14.3 Expansion joint filler, 15 New bridge fixing frame, 15.1 New bridge supporting reinforcement, 15.1.1 Bending section, 15.2 New bridge standardized reinforcement, 15.3 New bridge anchoring reinforcement, 16 Old bridge fixing frame, 16.1 Old bridge supporting reinforcement, 16.2 Old bridge standardized reinforcement, 16.3 Old bridge anchoring reinforcement. Detailed Implementation

[0024] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1-2As shown, a structure for widening a bridge between a new and an old bridge includes a new bridge body 1 and an old bridge body 2. A widening gap 3 is provided between the new bridge body 1 and the old bridge body 2. The upper part of the main body of the old bridge body 2 is provided with an old bridge concrete layer 2.1 and an old bridge high-toughness concrete layer 2.2. The high-toughness concrete layer 2.2 is located on the old bridge body 2 near the side of the new bridge body 1. The upper part of the main body of the new bridge body 1 is provided with a new bridge concrete layer 1.1 and a new high-toughness concrete layer 1.2. The high-toughness concrete layer 1.2 is located on the new bridge body 1 near the side of the old bridge body 2. The top height of the high-toughness concrete layer 2.2 is the same as the top height of the high-toughness concrete layer 1.2 of the new bridge body. The bridge is set at the same horizontal plane. A stainless steel plate 4 is provided at the upper end of the widened gap 3. One end of the stainless steel plate 4 is provided on the high-toughness concrete layer 2.2 of the old bridge, and the other end of the stainless steel plate 4 is provided on the high-toughness concrete layer 1.2 of the new bridge. The uppermost layer of the old bridge body 2 is provided with the old bridge asphalt layer 5, and the uppermost layer of the new bridge body 1 is provided with the new bridge asphalt layer 6. An elastic asphalt layer 7 is provided between the old bridge asphalt layer 5 and the new bridge asphalt layer 6. The elastic asphalt layer 7 covers the stainless steel plate 4. Aluminum foil waterproof membrane is filled under the stainless steel plate 4. The old bridge asphalt layer 5 and the new bridge asphalt layer 6 are poured synchronously and integrally after the widening alignment of the new bridge body 1 and the old bridge is completed.

[0026] The old bridge concrete layer 2.1 and the old bridge high-toughness concrete layer 2.2 are connected by the old bridge steel reinforcement frame 8, and the new bridge concrete layer 1.1 and the new bridge high-toughness concrete layer 1.2 are connected by the new bridge steel reinforcement frame 9. The new bridge steel reinforcement frame 9 can be of the appropriate length according to the widening requirements. However, the original length of the old bridge steel reinforcement frame 8 may be insufficient. Before pouring the old bridge high-toughness concrete layer 2.2, the old bridge steel reinforcement frame 8 can be welded to extend it. At the same time, it is necessary to ensure that the elastic asphalt layer 7 has a thickness of more than 120mm. When the old bridge steel reinforcement frame 8 cannot meet the pouring requirements of the elastic asphalt layer 7, the old bridge steel reinforcement frame 8 needs to be bent downwards accordingly.

[0027] The widened gap 3 includes an expansion gap 3.1 and a high-toughness concrete extension layer 3.2 of the old bridge. The stainless steel plate 4 is disposed on the expansion gap 3.1. The high-toughness concrete extension layer 3.2 of the old bridge is integrally formed with the high-toughness concrete layer 2.2 of the old bridge. A tough steel reinforcement frame 10 is provided inside the high-toughness concrete extension layer 3.2. The tough steel reinforcement frame 10 includes a connecting section 10.1 for welding with the main steel reinforcement frame 2.5 of the old bridge body 2 and an unfolding section 10.2 for ensuring the structural stability of the high-toughness concrete extension layer 3.2 of the old bridge. The unfolding section 10.2 is hook-shaped, first downward and then upward. The tough steel reinforcement frame 10 also includes several frame steel bars. The several frame steel bars are all arranged perpendicularly to the connecting section 10.1 and the unfolding section 10.2. The several frame steel bars include connecting frame steel bars 10.3 uniformly welded to the connecting section 10.1 along the setting direction of the connecting section 10.1 and the shaping frame steel bars 10.4 bent inside the unfolding section 10.2.

[0028] like Figure 1 As shown, the width of the high-toughness concrete extension layer 3.2 of the old bridge is greater than or equal to 100mm and less than or equal to 150mm. The end of the unfolded section 10.2 is hook-shaped with an upward inclination. The spacing between the two adjacent sets of tough steel reinforcement frames 10 is 180-220mm.

[0029] like Figure 3 As shown, the width of the high-toughness concrete extension layer 3.2 of the Tuojiu Bridge is greater than 150mm, the end of the unfolded section 10.2 is hook-shaped, first horizontal and then vertically upward, and the spacing between the two adjacent sets of tough steel reinforcement frames 10 is 80-120mm.

[0030] The minimum width of the high-toughness concrete extension layer 3.2 of the old bridge is 100mm, which is also the ideal width. However, due to deviations during the widening process, this width needs to be appropriately increased. If the width exceeds 200mm, the structure of the toughness steel reinforcement frame 105 needs to be redesigned and cannot be directly adopted. Figure 1 and Figure 3 The structure.

[0031] like Figure 1As shown, the bottom end of the old bridge's high-toughness concrete extension layer 3.2 is provided with a drip groove 2.3, and the bottom of the new bridge body 1 near the old bridge body 2 is provided with a drip rubber strip 1.3. The lower end of the widened gap 3 is provided with a water receiving box 11 for receiving water dripped from the drip groove 2.3 and the drip rubber strip 1.3. The bottom end of the water receiving box 11 is provided with a drain pipe 12 for draining the water in the water receiving box 11 to the ground. Epoxy interface agent 13 is provided between the old bridge concrete layer 2.1 and the old bridge high-toughness concrete layer 2.2, between the main body of the old bridge body 2 and the old bridge high-toughness concrete layer 2.2, between the new bridge concrete layer 1.1 and the new bridge high-toughness concrete layer 1.2, and between the main body of the new bridge body 1 and the new bridge high-toughness concrete layer 1.2.

[0032] like Figure 4 As shown, the old bridge body 2 has multiple old bridge expansion joints along its laying direction, and the old bridge expansion joints are provided with old bridge expansion joint steel 2.4. The new bridge body 1 has multiple new bridge expansion joints along its laying direction, and the new bridge expansion joints are provided with new bridge expansion joint steel 1.4. The old bridge expansion joints and the new bridge expansion joints are staggered. The end of the new bridge expansion joint near the old bridge body 2 and the end of the old bridge expansion joint near the new bridge body 1 are connected by a widened expansion joint 14. The widened expansion joint 14 is located on the centerline of the elastic asphalt layer 7, and the widened expansion joint 14 is provided with a widened expansion joint steel 14.1.

[0033] like Figure 5-6 As shown, a new bridge fixing frame 15 for supporting one side of the expansion joint steel 14.1 is provided at one end of the elastic asphalt layer 7 near the new bridge body 1, and an old bridge fixing frame 16 for supporting the other side of the expansion joint steel 14.1 is provided at one end of the elastic asphalt layer 7 near the old bridge body 2. The bottom end of the new bridge fixing frame 15 is fixedly connected to the main body of the new bridge body 1, and the bottom end of the old bridge fixing frame 16 is fixedly connected to the main body of the old bridge body 2.

[0034] The new bridge fixing frame 15 includes new bridge supporting steel bars 15.1, new bridge shaping steel bars 15.2, and new bridge anchoring steel bars 15.3. The new bridge supporting steel bars 15.1, new bridge shaping steel bars 15.2, and new bridge anchoring steel bars 15.3 are welded in pairs. The new bridge supporting steel bars 15.1 are U-shaped, with both ends fixedly connected to the new bridge body 1. The middle section of the new bridge supporting steel bars 15.1 is welded and fixed to the new bridge anchoring steel bars 15.3. The new bridge shaping steel bars 15.2 are arranged perpendicular to the new bridge supporting steel bars 15.1, and each group of 15.2 includes four new bridge shaping steel bars 15.2, with two new bridge shaping steel bars 15.2 respectively connected to both ends of the new bridge supporting steel bars 15.1. Welded and installed inside the new bridge body 1, two additional new bridge standard steel bars 15.2 are located at the mid-section bend of the new bridge support steel bar 15.1 for welding with the new bridge support steel bar 15.1 and the new bridge anchor steel bar 15.3. The new bridge anchor steel bar 15.3 is horizontally arranged, and one end of the new bridge anchor steel bar 15.3 is used for welding with the widened expansion joint steel 14.1. Both ends of the new bridge support steel bar 15.1 are provided with bends 15.1.1, and the two bends 15.1.1 are bent close to each other to realize the installation and connection of the new bridge fixing frame 15, ensuring the fixing stability and firmness between the new bridge fixing frame 15 and the new bridge body 1, and at the same time ensuring the connection stability between the new bridge fixing frame 15 and the widened expansion joint steel 14.1.

[0035] The old bridge fixing frame 16 includes old bridge supporting steel bars 16.1, old bridge shaping steel bars 16.2, and old bridge anchoring steel bars 16.3. The old bridge supporting steel bars 16.1, old bridge shaping steel bars 16.2, and old bridge anchoring steel bars 16.3 are welded in pairs. The old bridge supporting steel bars 16.1 are U-shaped. One end of the old bridge supporting steel bar 16.1 is fixedly connected to the old bridge body 2, and the other end is fixedly connected to the old bridge high-toughness concrete extension layer 3.2 between the new bridge body 1 and the old bridge body 2. The middle section of the old bridge supporting steel bar 16.1 is welded and fixed to the old bridge anchoring steel bars 16.3. The old bridge shaping steel bars 16.2 are arranged perpendicular to the old bridge supporting steel bars 16.1. The set of fixed reinforcing bars 16.2 includes two old bridge fixed reinforcing bars 16.2. The two old bridge fixed reinforcing bars 16.2 are located at the middle bend of the old bridge support reinforcing bars 16.1 for welding with the old bridge support reinforcing bars 16.1 and the old bridge anchoring reinforcing bars 16.3. The old bridge anchoring reinforcing bars 16.3 are set horizontally. One end of the old bridge anchoring reinforcing bars 16.3 is used for welding with the widening expansion joint steel 14.1. The old bridge body 2 is provided with anchoring holes 2.6 for fixing the old bridge support reinforcing bars 16.15.1, realizing the installation and connection of the old bridge fixing frame 16, ensuring the fixing stability and firmness between the old bridge fixing frame 16 and the old bridge body 2, and at the same time ensuring the connection stability between the old bridge fixing frame 16 and the widening expansion joint steel 14.1.

[0036] Before the installation of the expansion joint steel 14.1, the new bridge fixing frame 15 on the new bridge body 1 is a pre-installed structure that can be used directly. However, the old bridge fixing frame 16 on the old bridge body 2 requires the old bridge body 2 to be slotted, drilled with rebar holes 2.6, installed, and the new bridge deck to be formed flush with the new bridge deck. Then, the expansion joint steel 14.1 is welded to the new bridge fixing frame 15 and the old bridge fixing frame 16. Then, templates are placed on both sides of the expansion joint 14 to prevent concrete and asphalt from flowing into the expansion joint 14 when the concrete and asphalt on the new bridge body 1 and the old bridge body 2 are poured. After the concrete and asphalt have solidified to the specified strength, the expansion joint steel 14.1 is filled with sealing tape 14.2 and expansion joint filler 14.3.

[0037] A method for widening existing and new bridge structures, used in the construction of such structures, comprises the following steps: S1: Based on the widening requirements of the old and new bridge bodies, measure the elevation of the crash barriers on one or both sides of the old bridge body 2 that need to be widened, and redefine the alignment of the bridge deck after widening based on the elevation. S2: Use wire cutting to dismantle the crash barrier; S3: Based on the elevation position, use manual chiseling to chisel out the area on the old bridge body 2 to lay the old bridge high-toughness concrete layer 2.2 and the area on the new bridge body 1 to lay the new bridge high-toughness concrete layer 1.2, ensuring that the thickness of the elastic asphalt layer 7 is not less than 120mm, and use wind welding to cut off the excess steel bars after the demolition of the crash barrier. S4: Apply epoxy interface agent 13 to the connection surface between the old bridge concrete layer 2.1 and the old bridge high-toughness concrete layer 2.2, the connection surface between the main body of the old bridge body 2 and the old bridge high-toughness concrete layer 2.2, the connection surface between the new bridge concrete layer 1.1 and the new bridge high-toughness concrete layer 1.2, and the connection surface between the main body of the new bridge body 1 and the new bridge high-toughness concrete layer 1.2. S5: Casting and shaping of the high-toughness concrete layer 2.2 for the old bridge and the high-toughness concrete layer 1.2 for the new bridge; S6: Place aluminum foil waterproof membrane at the upper end of the widened gap 3; S7: Cover the aluminum foil waterproof membrane with a 6mm thick stainless steel plate 4. The stainless steel plate 4 is placed on both sides of the old bridge high-toughness concrete layer 2.2 and the new bridge high-toughness concrete layer 1.2 respectively. S8: Lay the asphalt pavement layer, which includes the new bridge asphalt layer 6 and the old bridge asphalt layer 5, and compact it with a road roller. S9: Draw a center line on the asphalt layer of the road surface along the widening gap 3, and then draw construction lines 200mm away from the new bridge asphalt layer 6 and 200mm away from the old bridge asphalt layer 5 according to the center line. S10: According to the two construction lines, the asphalt layer of the road surface is cut down to the old bridge high-toughness concrete layer 2.2 and the new bridge high-toughness concrete layer 1.2 to form asphalt grooves; S11: Clean the asphalt tank and apply epoxy interface agent 13 to the bottom and sides of the asphalt tank; S12: Add aggregate and elastic material to a heated container at a weight ratio of 1:2, and heat and mix them together with asphalt and concrete. Before the epoxy interface agent 13 cures, complete the paving operation to form an elastic asphalt layer 7, and compact it by rolling with a road roller.

[0038] In step S5, before the pouring and molding of the old bridge high-toughness concrete layer 2.2 and the new bridge high-toughness concrete layer 1.2, the toughness steel reinforcement frame 10 is welded to the main steel reinforcement frame 2.5 of the old bridge body 2. In step S5, the old bridge fixing frame 16 is fixedly connected to the old bridge body 2. Before step S12 is implemented, the expansion joint steel 14.1 is fixed to the new bridge fixing frame 15 and the old bridge fixing frame 16, and templates are installed on both sides of the expansion joint 14.

[0039] Whether it's the laying of the new bridge asphalt layer 6 and the old bridge asphalt layer 5, or the laying of the elastic asphalt layer 7, due to the length of the viaduct and the influence of weather, it is impossible to complete the entire laying work in one go. Therefore, it is necessary to prepare for multiple laying operations. During the laying process, after the first laying is completed, the cross-section of the road asphalt layer or the cross-section of the elastic asphalt layer 7 is shaped into an inclined slope. In the subsequent laying process, the cross-section of the road asphalt layer or the cross-section of the elastic asphalt layer 7 is first heated to soften the road asphalt layer or the elastic asphalt layer 7 before laying. This ensures that the subsequent road asphalt layer or the elastic asphalt layer 7 is tightly integrated with the original structure, thus ensuring the laying quality of the road asphalt layer or the elastic asphalt layer 7.

[0040] The above description only illustrates the preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All modifications made within the scope of the independent claims of this invention are also within the scope of protection of this invention.

Claims

1. A structure for widening old and new bridge bodies, characterized in that: The bridge includes a new bridge body (1) and an old bridge body (2), with a widened gap (3) between the new bridge body (1) and the old bridge body (2). The upper part of the main body of the old bridge body (2) is provided with an old bridge concrete layer (2.1) and an old bridge high-toughness concrete layer (2.2), with the old bridge high-toughness concrete layer (2.2) located on the side of the old bridge body (2) close to the new bridge body (1). The upper part of the main body of the new bridge body (1) is provided with a new bridge concrete layer (1.1) and a new bridge high-toughness concrete layer (1.2), with the new bridge high-toughness concrete layer (1.2) located on the side of the new bridge body (1) close to the old bridge body (2). On one side, the top height of the old bridge high-toughness concrete layer (2.2) is set at the same level as the top height of the new bridge high-toughness concrete layer (1.2). A stainless steel plate (4) is provided at the upper end of the widened gap (3). One end of the stainless steel plate (4) is set on the old bridge high-toughness concrete layer (2.2), and the other end of the stainless steel plate (4) is set on the new bridge high-toughness concrete layer (1.2). The uppermost layer of the old bridge body (2) is provided with an old bridge asphalt layer (5), and the uppermost layer of the new bridge body (1) is provided with a new bridge asphalt layer (6). The old bridge asphalt layer (5) and the new bridge asphalt layer (6) are... An elastic asphalt layer (7) is provided between the bridge sections, which covers a stainless steel plate (4). The old bridge asphalt layer (5) and the new bridge asphalt layer (6) are poured synchronously and integrally after the widening alignment of the new bridge body (1) and the old bridge is completed. The old bridge concrete layer (2.1) and the old bridge high-toughness concrete layer (2.2) are connected by the old bridge steel reinforcement frame (8). The new bridge concrete layer (1.1) and the new bridge high-toughness concrete layer (1.2) are connected by the new bridge steel reinforcement frame (9). The widening gap (3) includes an expansion gap (3.1) and an extension layer of the old bridge high-toughness concrete (3). .2), the stainless steel plate (4) is placed on the expansion gap (3.1), the old bridge high toughness concrete extension layer (3.2) is integrally formed with the old bridge high toughness concrete layer (2.2), the old bridge high toughness concrete extension layer (3.2) is provided with a toughness steel reinforcement frame (10), the toughness steel reinforcement frame (10) includes a connecting section (10.1) for welding with the main steel reinforcement frame (2.5) of the old bridge body (2) and an unfolding section (10.2) for ensuring the structural stability of the old bridge high toughness concrete extension layer (3.2), the unfolding section (10.2) is hook-shaped with the direction first downward and then upward.

2. The structure for widening old and new bridge bodies according to claim 1, characterized in that: The bottom end of the high-toughness concrete extension layer (3.2) of the old bridge is provided with a drip groove (2.3), the bottom of the new bridge body (1) near the old bridge body (2) is provided with a drip rubber strip (1.3), the lower end of the widened gap (3) is provided with a water receiving box (11) for receiving the water dripped from the drip groove (2.3) and the drip rubber strip (1.3), and the bottom end of the water receiving box (11) is provided with a drain pipe (12) for diverting the water in the water receiving box (11) to the ground.

3. The structure for widening old and new bridge bodies according to claim 1, characterized in that: An epoxy interface agent (13) is provided between the old bridge concrete layer (2.1) and the old bridge high-toughness concrete layer (2.2), between the main body of the old bridge body (2) and the old bridge high-toughness concrete layer (2.2), between the new bridge concrete layer (1.1) and the new bridge high-toughness concrete layer (1.2), and between the main body of the new bridge body (1) and the new bridge high-toughness concrete layer (1.2).

4. The structure for widening old and new bridge bodies according to claim 1, characterized in that: The old bridge body (2) is provided with multiple old bridge expansion joints along the laying direction of the old bridge body (2), and the old bridge expansion joints are provided with old bridge expansion joint steel (2.4). The new bridge body (1) is provided with multiple new bridge expansion joints along the laying direction of the new bridge body (1), and the new bridge expansion joints are provided with new bridge expansion joint steel (1.4). The old bridge expansion joints and the new bridge expansion joints are staggered. The end of the new bridge expansion joint near the old bridge body (2) and the end of the old bridge expansion joint near the new bridge body (1) are connected by a widening expansion joint (14). The widening expansion joint (14) is located on the centerline of the elastic asphalt layer (7), and the widening expansion joint (14) is provided with a widening expansion joint steel (14.1).

5. The structure for widening old and new bridge bodies according to claim 4, characterized in that: The elastic asphalt layer (7) has a new bridge fixing frame (15) for supporting one side of the expansion joint steel (14.1) at one end near the new bridge body (1), and an old bridge fixing frame (16) for supporting the other side of the expansion joint steel (14.1) at one end near the old bridge body (2). The bottom end of the new bridge fixing frame (15) is fixedly connected to the main body of the new bridge body (1), and the bottom end of the old bridge fixing frame (16) is fixedly connected to the main body of the old bridge body (2).

6. A method for widening new and old bridge structures, characterized in that, The steps for constructing the bridge widening structure as described in claim 5 are as follows: S1: Based on the widening requirements of the old and new bridge bodies, measure the elevation of the crash barriers on one or both sides of the old bridge body (2) to be widened, and redefine the alignment of the bridge surface after widening based on the elevation. S2: Use wire cutting to dismantle the crash barrier; S3: Based on the elevation position, use manual chiseling to chisel out the area on the old bridge body (2) to lay the old bridge high-toughness concrete layer (2.2) and the area on the new bridge body (1) to lay the new bridge high-toughness concrete layer (1.2), ensuring that the thickness of the elastic asphalt layer (7) is not less than 120mm, and use wind welding to cut off the excess steel bars after the demolition of the crash barrier. S4: Apply epoxy interface agent (13) to the interface between the old bridge concrete layer (2.1) and the old bridge high-toughness concrete layer (2.2), the interface between the main body of the old bridge body (2) and the old bridge high-toughness concrete layer (2.2), the interface between the new bridge concrete layer (1.1) and the new bridge high-toughness concrete layer (1.2), and the interface between the main body of the new bridge body (1) and the new bridge high-toughness concrete layer (1.2). S5: Casting and shaping of the high-toughness concrete layer (2.2) for the old bridge and the high-toughness concrete layer (1.2) for the new bridge; S6: Place aluminum foil waterproof membrane at the upper end of the widened gap (3); S7: Cover the aluminum foil waterproof membrane with a 6mm thick stainless steel plate (4), with the stainless steel plate (4) on both sides of the old bridge high-toughness concrete layer (2.2) and the new bridge high-toughness concrete layer (1.2). S8: Pave the asphalt layer of the road surface, which includes the asphalt layer of the new bridge (6) and the asphalt layer of the old bridge (5), and compact it with a road roller; S9: Draw a center line on the asphalt layer along the widening gap (3), and then draw construction lines 200mm from the new bridge asphalt layer (6) and 200mm from the old bridge asphalt layer (5) according to the center line. S10: According to the two construction lines, the asphalt layer of the road surface is cut down to the old bridge high-toughness concrete layer (2.2) and the new bridge high-toughness concrete layer (1.2) to form asphalt grooves; S11: Clean the asphalt tank and apply epoxy interface agent (13) to the bottom and sides of the asphalt tank. S12: Add aggregate and elastic material into a container with integrated heating at a weight ratio of 1:2, heat and stir together with asphalt and concrete, complete the paving operation before the epoxy interface agent (13) cures to form an elastic asphalt layer (7), and compact it by rolling with a road roller.

7. The method for widening old and new bridge bodies according to claim 6, characterized in that: In step S5, before pouring and forming the old bridge high-toughness concrete layer (2.2) and the new bridge high-toughness concrete layer (1.2), the toughness steel reinforcement frame (10) is welded to the main steel reinforcement frame (2.5) of the old bridge body (2).

8. The method for widening old and new bridge bodies according to claim 6, characterized in that: The expansion joints of the old bridge and the expansion joints of the new bridge are staggered. The end of the new bridge expansion joint near the old bridge body (2) and the end of the old bridge expansion joint near the new bridge body (1) are connected by the widened expansion joint (14). In step S5, the old bridge fixing frame (16) is fixedly connected to the old bridge body (2). Before step S12 is implemented, the widened expansion joint steel (14.1) is fixed on the new bridge fixing frame (15) and the old bridge fixing frame (16). Templates are installed on both sides of the widened expansion joint (14).

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