Transverse widening, reinforcing and load-lifting connecting device for new and old bridges without interrupting traffic and construction method

Abstract

The invention discloses a traffic-uninterrupted new and old bridge transverse widening, reinforcing and load-lifting connecting device and a construction method, the traffic-uninterrupted new and old bridge transverse widening, reinforcing and load-lifting connecting device comprises an original bridge, a spliced bridge, a prestress anchoring assembly and a tension rope assembly, the spliced bridge is arranged on one side of the original bridge, and a cantilever assembly is arranged on the side, facing the original bridge, of the spliced bridge; one end of the prestress anchoring assembly is fixed to the original bridge, the other end of the prestress anchoring assembly is connected with the cantilever assembly, and therefore the original bridge and the spliced bridge are connected through the prestress anchoring assembly, the tensioning rope assembly is connected with the prestress anchoring assembly, and tensioning force is applied to the prestress anchoring assembly through the tensioning rope assembly. Therefore, in the construction process of the transverse widening structure of the bridge, the distance between an original bridge and a spliced bridge is reduced, the tensile safety reserve of concrete in the widening connecting area of the original bridge and the spliced bridge is increased, and the influence of vibration generated by vehicle driving on the distance between the original bridge and the spliced bridge in the construction process and normal operation is eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a device and a construction method for transversely widening, reinforcing and loading connection of a new bridge and an old bridge without interrupting traffic. Background Art

[0002] Existing highway bridges are limited by the design concepts of the earlier period and the local economic development. The construction width can only meet the width requirements of the construction period at that time. With the development of the economy, the existing highway bridges cannot meet the use needs of today's society. Compared with the construction of new lines, widening existing highway bridges has the advantages of small investment, short cycle, and small impact on the environment. Therefore, more expressways and national and provincial trunk roads have adopted the horizontal widening reconstruction method.

[0003] The widening and reconstruction of bridges refers to the reinforcement and reconstruction of existing bridges, and then the addition of main beams or the construction of new bridges on one or both sides of the existing bridges, and the use of appropriate splicing methods to splice the new and old bridges to increase the number of lanes and meet traffic needs. At present, most of the bridge widening and reconstruction projects on the market choose the widening connection form in which the upper part is rigidly connected and the lower part is not connected. During the construction process, due to the cast-in-place concrete at the widening connection of the new and old bridges, if the old bridge is continuously constructed, the later poured concrete is affected by the vibration of the driving, and the concrete cannot be completely closed and solidified inside. It is in a tensile state during operation and cracks appear. Therefore, the current construction adopts disconnection construction, which requires the addition of temporary access roads, increases large investments, and increases the construction period. At the same time, it brings a large number of social instability factors, which has a great negative impact on the local transportation network and social public opinion; at the same time, the widening rigidity of the new and old bridges and the bearing capacity of the new and old bridges are inconsistent, resulting in the incoordination of the changes of the new and old bridges in the later period, which aggravates the occurrence of diseases at the splicing point. Summary of the invention

[0004] In view of the above shortcomings, the technical problem to be solved by the present invention is to provide a device and construction method for connecting the new and old bridges in a horizontal manner without interrupting traffic, so as to ensure the stable connection of the new and old steel box girders and prevent problems such as cracks, pavement damage, and settlement differences at the joint of the new and old bridges. It also prevents the inconsistency of the width stiffness of the new and old bridges and the bearing capacity of the new and old bridges, which will cause the incoordination of the changes of the new and old bridges in the later stage.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The new and old bridges are connected laterally to widen, reinforce and lift the bridges without interrupting traffic, including:

[0007] Original bridge;

[0008] A spliced ​​bridge with a cantilever assembly on the side facing the original bridge;

[0009] A prestressed anchor assembly is fixed to the original bridge, and the prestressed anchor assembly is connected to the cantilever assembly to connect the original bridge and the spliced ​​bridge;

[0010] A tensioning rope assembly is connected to the prestressed anchor assembly. The tensioning rope assembly applies a tensioning force to the prestressed anchor assembly to reduce the distance between the original bridge and the spliced ​​bridge, so as to eliminate the distance change between the original bridge and the spliced ​​bridge caused by uninterrupted traffic through the tensioning force.

[0011] As a preferred solution of the present invention, the tensioning rope assembly includes a main rope for applying tensioning force and an auxiliary rope for transmitting tensioning force, the two ends of the auxiliary rope are respectively connected to the main rope and the prestressed anchor assembly, and the main rope bends under the action of the auxiliary rope.

[0012] As a preferred solution of the present invention, a force converter is fixed on the original bridge, and the main rope is movably installed on the original bridge through the force converter, and the main rope is bent inside the force converter.

[0013] As a preferred solution of the present invention, when the main rope is not subjected to tension, the main rope is bent by the auxiliary rope at an angle a=2arccos(S / 2L), wherein a is the bending angle of the main rope under the action of the auxiliary rope, S is the spacing between adjacent force converters, and L is the span length of the spliced ​​bridge.

[0014] As a preferred solution of the present invention, the relationship between the spacing between adjacent force converters and the main rope and auxiliary rope is as follows: L×d 2 =S×D 2 , where S is the spacing between adjacent force converters, L is the span length of the spliced ​​bridge, d is the equivalent diameter of the secondary rope, and D is the equivalent diameter of the main rope.

[0015] As a preferred solution of the present invention, a guide member is installed on the spliced ​​bridge, and the auxiliary rope is connected to the prestressed anchor assembly through the guide member so that the tensioning force of the auxiliary rope on the prestressed anchor assembly is set along the axial direction of the prestressed anchor assembly.

[0016] As a preferred solution of the present invention, the prestressed anchor assembly includes an anchor rod and a limit nut. The anchor rod is fixedly connected to the original bridge and is passed through the cantilever assembly. The limit nut is installed on the anchor rod through threads, and the limit nut is adapted to the cantilever assembly to maintain the spacing between the original bridge and the spliced ​​bridge.

[0017] As a preferred solution of the present invention, an end steel plate is connected to the tail of the anchor rod, and a connecting steel bar is welded to the outer side of the end steel plate by a corner weld, and is connected to the steel cage in the original bridge through the connecting steel bar.

[0018] As a preferred solution of the present invention, the cantilever assembly is provided with a cantilever vertical plate, the anchor rod is arranged through the cantilever vertical plate, and the limit nut abuts against the side wall of the cantilever vertical plate on the side away from the original bridge.

[0019] As a preferred solution of the present invention, the cantilever assembly is connected with a connecting transverse plate, the connecting transverse plate is located between the outer side wall of the cantilever vertical plate and the original bridge side wall, and shear nails are fixed on the connecting transverse plate.

[0020] The construction method of the transverse widening, reinforcement and loading connection device of the new and old bridges without interrupting traffic includes the following steps:

[0021] S1, set up a construction baffle on the original bridge, and chisel away the cantilever concrete of the original bridge, retaining the cantilever steel bars;

[0022] S2, hoisting and erecting the spliced ​​bridge, and adjusting the position of the spliced ​​bridge to ensure the position accuracy between the spliced ​​bridge and the original bridge;

[0023] S3, welding cantilever components on spliced ​​bridges;

[0024] S4, installing a prestressed anchor assembly, fixing the prestressed anchor assembly on the cantilever steel bar, and setting the prestressed anchor assembly through the cantilever assembly, and pouring concrete in the joint between the original bridge and the spliced ​​bridge;

[0025] S5, connecting the tensioning rope assembly and the prestressed anchor assembly;

[0026] S6, during the concrete solidification process, by applying tensioning force to the tensioning rope assembly, the distance between the original bridge and the spliced ​​bridge is reduced, the compressive stress of the concrete between the original bridge and the spliced ​​bridge is increased, and the influence of external factors on the distance between the original bridge and the spliced ​​bridge during the construction process is eliminated. After the concrete solidifies, the limit nut is tightened by the torquer to fix the prestressed anchor assembly;

[0027] S7, remove the construction baffles and pour the asphalt pavement of the entire bridge;

[0028] S8, after the bridge has been in operation for many years, repeat step S6 to increase the boundary constraints and coordinated force stiffness of the original bridge and the spliced ​​bridge. By tensioning the cable assembly and tightening the cable tension, a stiff truss is formed between the spliced ​​widened bridges to improve the coordinated force of the new and old bridges and improve the overall load bearing capacity of the new and old bridges.

[0029] Compared with the prior art, the present invention has the following beneficial effects: (1) by applying tensioning force to the prestressed anchor assembly through the tensioning rope assembly, the distance between the original bridge and the spliced ​​bridge is reduced during the construction of the transverse widening structure of the bridge, the concrete tensile reserve stress at the joint of the new and old bridges is increased, and the influence of the vibration caused by vehicle driving during the construction on the distance between the original bridge and the spliced ​​bridge is eliminated, so that there is no need to interrupt traffic during the construction process, reducing the impact of the widening construction on traffic.

[0030] (2) Tensioning force is applied to the original bridge and the spliced ​​bridge by tensioning the rope assembly, so that the original bridge and the spliced ​​bridge form a rigid truss, thereby enhancing the overall stress of the original bridge and the spliced ​​bridge and improving the load-bearing capacity of the entire bridge.

[0031] (3) During the construction or normal operation of the connection device, the tensioning, loading and re-planting can be repeated according to the actual situation to ensure the consistency of the stiffness of the new and old bridges at the widening point and the bearing capacity of the new and old bridges, thereby ensuring the coordination of the changes of the new and old bridges in the later stage.

[0032] (4) The tensioning rope assembly can be used to tension the original bridge and the spliced ​​bridge, thereby improving the coordination ability of the original bridge and the spliced ​​bridge; the main rope can also be used to drive the auxiliary rope to tension multiple prestressed anchor assemblies at the same time, thereby improving the construction efficiency of the transverse widening structure of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the transverse widening structure of this bridge.

[0034] Figure 2 This is a partial enlarged view of point A.

[0035] Figure 3 It is a connection diagram of cantilever components and spliced ​​bridges.

[0036] Figure 4 It is a structural schematic diagram of a prestressed anchor assembly.

[0037] Figure 5 This is a schematic diagram of the connection between the main rope and the original bridge.

[0038] Figure 6 It is a structural schematic diagram of the tensioning rope assembly.

[0039] Figure 7 It is a schematic diagram of the connection between a single auxiliary rope and auxiliary ropes.

[0040] Figure markings: prestressed anchor assembly 1, anchor rod 1-1, limit nut 1-2, grouting pipe 1-3, reinforcement washer 1-4, isolation sleeve 1-5, cantilever assembly 2, connecting cross plate 2-1, cantilever vertical plate 2-2, reinforcement cross partition 2-3, tensioning rope assembly 3, limit block 3-1, main rope 3-2, force converter 3-3, force ear plate 3-3-1, threading hole 3-3-2, guide 3-4, force transmission guide 3-4-1, force transmission guide shaft 3-4-2, auxiliary rope 3-5, end steel plate 4, cantilever steel bar 5, shear nail 6, spliced ​​bridge 9, top plate 9-1, web plate 9-2, original bridge 11, construction baffle 12, connecting steel bar 13, asphalt pavement layer 14. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings.

[0042] The device for connecting the new and old bridges in a transverse manner without interrupting traffic, comprising: an original bridge 11, a spliced ​​bridge 9, a prestressed anchor assembly 1 and a tensioning rope assembly 3. The spliced ​​bridge 9 is arranged on one side of the original bridge 11, and a cantilever assembly 2 is arranged on the side of the spliced ​​bridge 9 facing the original bridge 11. One end of the prestressed anchor assembly 1 is fixed on the original bridge 11, and the other end is connected to the cantilever assembly 2, so that the original bridge 11 and the spliced ​​bridge 9 are connected through the prestressed anchor assembly 1, and the tensioning rope assembly 3 is connected to the prestressed anchor assembly 1. The tensioning rope assembly 3 applies tensioning force to the prestressed anchor assembly 1, thereby reducing the distance between the original bridge 11 and the spliced ​​bridge 9 during the construction process of the transverse widening structure of the bridge, eliminating the influence of the vibration generated by vehicle driving during the construction process on the distance between the original bridge 11 and the spliced ​​bridge 9, improving the stable connection between the original bridge 11 and the spliced ​​bridge 8, preventing cracks, pavement damage, settlement differences and other problems at the joint of the new and old bridges, and keeping the tensioning rope assembly 3 in a tensioned state, thereby improving the coordinated force of the new and old bridges and improving the load-bearing capacity.

[0043] The tensioning rope assembly 3 includes a main rope 3-2 for applying tensioning force and an auxiliary rope 3-5 for transmitting tensioning force. The two ends of the auxiliary rope 3-5 are respectively connected to the main rope 3-2 and the prestressed anchor assembly 1. The main rope 3-2 is bent under the action of the auxiliary rope 3-5. When it is necessary to apply tensioning force to the prestressed anchor assembly 1, a pulling device (such as a micro hydraulic jack) is arranged at both ends of the main rope 3-2 to pull the main rope 3-2, so that the bending angle of the main rope 3-2 is increased, and a certain pulling force is exerted on the auxiliary rope 3-5. The tensioning force is then transmitted to the prestressed anchor assembly 1 through the auxiliary ropes 3-5, and since the auxiliary ropes 3-5 are at least partially slidably connected to the spliced ​​bridge 9, the original bridge 11 and the spliced ​​bridge 9 are tightened by the tensioning force, thereby reducing the distance between the original bridge 11 and the spliced ​​bridge 9, and the tensioning rope assembly 3 always provides tensioning force to the bridge 11 and the spliced ​​bridge 9, so that the concrete poured at the joint of the original bridge 11 and the spliced ​​bridge 9 is in a compressed state, thereby increasing the tensile reserve stress of the concrete at the joint of the new and old bridges. A force converter 3-3 is fixed on the original bridge 11. The force converter 3-3 includes two parallel force converter ear plates 3-3-1. A threading hole 3-3-2 is provided on the force converter ear plate 3-3-1. The diameter of the threading hole 3-3-2 is equal to the main rope diameter D+4mm. The main rope 3-2 is passed through the threading hole 3-3-2 on the force converter 3-3 to realize the movably installed main rope 3-2 on the original bridge 11. The main rope 3-2 is affected by the auxiliary rope 3-5 and bends between the adjacent force converter ear plates 3-3-1 of the force converter 3-3. In order to prevent the main rope 3-2 from slipping out of the force converter 3-3, limit blocks 3-1 are provided at both ends of the main rope 3-2. The width of the limit blocks 3-1 is greater than the diameter of the threading hole 3-3-2.

[0044] During the construction process, the main rope 3-2 is tensioned by the tensioning device, and the main rope 3-2 tensions the auxiliary rope 3-5, and the two ends of the main rope 3-2 are locked by the limit blocks 3-1, that is, during the tensioning process of the tensioning device, limit blocks 3-1 are set at both ends of the main rope 3-2, and the limit blocks 3-1 abut against the nearest force converter 3-3, so that the main rope 3-2 remains in a tensioned state during construction or daily use, thereby tensioning the auxiliary rope 3-5, so that the connection structure of the main rope 3-2 and the auxiliary rope 3-5 remains taut and rigid, so as to form a rigid truss, improve the coordination between the new and old bridges, and further improve the load-bearing capacity of the entire bridge.

[0045] A guide member 3-4 is installed on the spliced ​​bridge 9, and the auxiliary rope 3-5 is connected to the prestressed anchor assembly 1 through the guide member 3-4, so that the tensioning force of the auxiliary rope 3-5 on the prestressed anchor assembly 1 is set along the axial direction of the prestressed anchor assembly 1. The guide member 3-4 includes a force transmission guide 3-4-1 and a force transmission guide shaft 3-4-2. The force transmission guide shaft 3-4-2 is fixed in the cantilever assembly 2, and the force transmission guide 3-4-1 is arranged below the force transmission guide shaft 3-4-2. Preferably, the force transmission guide 3-4-1 and the force converter 3-3 are arranged at the same height, and the force transmission guide shaft 3-4-2 and the prestressed anchor assembly 1 are arranged at the same height. Preferably, the force transmission guide 3-4-1 includes two ear plates and a guide shaft connected between the two ear plates, and the auxiliary rope 3-5 is guided to the force transmission guide shaft 3-4-2 through the guide shaft.

[0046] When the main rope 3-2 is not subjected to tension, the main rope 3-2 is bent at an angle a=2arccos(S / 2L) under the action of the auxiliary rope 3-5, wherein a is the bending angle of the main rope 3-2 under the action of the auxiliary rope 3-5, S is the spacing between adjacent force converters 3-3, and L is the span length of the spliced ​​bridge 9.

[0047] The relationship between the distance between adjacent force converters 3-3 and the main rope 3-2 and the auxiliary rope 3-5 is as follows: L×d 2 =S×D 2 , where S is the spacing between adjacent force converters 3-3, L is the span length of the spliced ​​bridge 9, d is the equivalent diameter of the auxiliary rope 3-5, and D is the equivalent diameter of the main rope 3-2.

[0048] The prestressed anchor assembly 1 includes an anchor rod 1-1 and a limiting nut 1-2. An end steel plate 4 is connected to the tail of the anchor rod 1-1. A connecting steel bar 13 is welded to the outer corner of the end steel plate 4. The connecting steel bar 13 is connected to the steel cage in the original bridge 11, so that one end of the anchor rod 1-1 is fixedly connected to the original bridge 11. The other end of the anchor rod 1-1 is passed through the cantilever assembly 2. The limiting nut 1-2 is installed on the anchor rod 1-1 through threads, and the limiting nut 1-2 is adapted to the cantilever assembly 2. The limiting nut 1-2 is locked with the cantilever assembly 2 to prevent the distance between the original bridge 11 and the spliced ​​bridge 9 from expanding, thereby further increasing the concrete tensile reserve stress at the joint of the new and old bridges.

[0049] The spliced ​​bridge 9 includes a top plate 9-1 and a web plate 9-2 connected to the bottom of the top plate 9-1. The cantilever assembly 2 is fixedly connected to the top plate 9-1 and the web plate 9-2 respectively. The cantilever assembly 2 includes a connecting transverse plate 2-1, a cantilever vertical plate 2-2, and a reinforcing transverse diaphragm 2-3. The reinforcing transverse diaphragm 2-3 is fixedly connected to the top plate 9-1 and the web plate 9-2 respectively. The cantilever vertical plate 2-2 is connected to the outside of the reinforcing transverse diaphragm 2-3, and the top of the cantilever vertical plate 2-2 is welded to the top plate 9-1. The connecting transverse plate 2-1 is connected to the outside of the cantilever vertical plate 2-2. The anchor rod 1-1 is set through the cantilever vertical plate 2-2. The limit nut 1-2 abuts against the side wall of the cantilever vertical plate 2-2 away from the original bridge 11. A shear nail 6 is fixed on the connecting transverse plate 2-1 to increase the connection strength between the cantilever assembly 2 and concrete. An isolation sleeve 1-5 and a grouting pipe 1-3 are fixed on the cantilever vertical plate 2-2, and an anchor rod 1-1 is arranged in the isolation sleeve 1-5. Cement slurry is poured into the outer side of the isolation sleeve 1-5 through the grouting pipe 1-3. In order to improve the strength of both ends of the isolation sleeve 1-5, reinforcing washers 1-4 are provided at both ends of the isolation sleeve 1-5. Preferably, the isolation sleeve 1-5 has a circular cross-section, and the anchor rod 1-1 is inserted in the center of the isolation sleeve 1-5. The grouting pipe 1-3 is arranged opposite to the annular chamber of the isolation sleeve 1-5, so as to facilitate cement slurry pouring into the isolation sleeve 1-5.

[0050] Among them, the main function of the connecting horizontal plate 2-1 is to connect with the cantilever height of the original bridge 11 after chiseling, to ensure smooth stiffness change, to avoid excessive stiffness difference, and to cause local stress concentration phenomenon; the cantilever vertical plate 2-2 is provided with circular holes at intervals of 2 meters, and the diameter of the circular holes = the diameter of the anchor rod + 4mm; the strengthening diaphragm 2-3 is used to assist in the fixed installation of the prestressed anchor assembly 1, to reduce the local stress concentration caused by the bending of the top plate 9-1 after the bridge is completed; and 3 steel box girder cantilever shear bolts, the main function of the shear bolts is to enhance the synergy between the steel cantilever and the concrete. The shear bolts 6 are constructed with a welding gun, and the construction spacing between adjacent shear bolts 6 is controlled at 20cm. In order to ensure the safety of vehicle traffic during the construction of the transverse widening structure of this bridge, a construction baffle 12 is provided on the widening side of the original bridge 11.

[0051] The above-mentioned construction method of the transverse widening, reinforcement and loading connection device of the new and old bridges without interrupting traffic includes the following steps:

[0052] S1. Set up a construction baffle 12 on the side of the original bridge 11 to be widened, chisel out the cantilever concrete of the original bridge 11, retain the cantilever steel bars 5, and inspect the cantilever steel bars 5. For cantilever steel bars 5 that are severely rusted and expanded, they should be replaced or reinforced, and the cantilever steel bars 5 should be coated with steel bar rust remover and durable rust inhibitor.

[0053] S2, hoisting and erecting the spliced ​​bridge 9, and adjusting the position of the spliced ​​bridge 9 to ensure the position accuracy between the spliced ​​bridge 9 and the original bridge 11. During the construction process, a temporary fixing connection device can be set on the spliced ​​bridge 9 and the original bridge 11, and the temporary fixing device can be made of I-beam;

[0054] S3, welding the cantilever assembly 2 on the spliced ​​bridge 9, welding the connecting horizontal plate 2-1, the cantilever vertical plate 2-2, and the reinforcing horizontal diaphragm 2-3 into shape, and then fixing and welding them on the spliced ​​bridge 9;

[0055] S4, install the prestressed anchor assembly 1, fix the connecting steel bar 13 of the prestressed anchor assembly 1 on the cantilever steel bar 5, and set the anchor rod 1-1 of the prestressed anchor assembly 1 through the cantilever vertical plate 2-2, and abut the limit nut 1-2 on the cantilever vertical plate 2-2, and pour concrete in the joint between the original bridge 11 and the spliced ​​bridge 9.

[0056] S5, first weld the force converter 3-3, the force guide 3-4-1 and the force guide shaft 3-4-2 to the original bridge 11 and the spliced ​​bridge 9 respectively, then pass the main rope 3-2 through the force converter 3-3, and then connect the auxiliary rope 3-5 to the main rope 3-2. Preferably, the auxiliary rope 3-5 is connected to the main rope 3-2 through a connecting ring, and then the auxiliary rope 3-5 is passed around the force guide 3-4-1 and the force guide shaft 3-4-2 in turn and then connected to the anchor rod 1-1.

[0057] S6, applying tension to the main rope 3-2 through an external pulling device, the tension on the main rope 3-2 is transmitted to the anchor rod 1-1 through the auxiliary rope 3-5, increasing the tensile safety reserve at the widened part of the original bridge 11 and the spliced ​​bridge 9, to maintain the distance between the original bridge 11 and the spliced ​​bridge 9, eliminate the influence of external factors on the distance between the original bridge 11 and the spliced ​​bridge 9 during the construction process, and increase the tensile reserve stress of the concrete at the joint of the new and old bridges. Specifically, three days after the concrete of the joint between the original bridge 11 and the spliced ​​bridge 9 is poured, a tension force is applied to the main rope 3-2, and the tension force is 0.3P, P = A*f, where A is the cross-sectional area of ​​the main rope 3-2, and f is the tensile design value of the main rope 3-2. After the concrete is cured for seven days, that is, ten days after the concrete is poured, the tension force applied to the main rope 3-2 is changed to 0.4P. After the tensioning is completed and stabilized, the prestressed anchor assembly 1 is fixed after the tensioning is stable, that is, the limit nut 1-2 is adjusted to ensure that the limit nut 1-2 is in contact with the cantilever vertical plate 2-2 after tensioning, and the tension of the main rope 3-2 is maintained by the limit block 3-1. After tensioning, the solidification period is maintained for three days. The prestressed anchor mortar is injected into the isolation sleeve 1-5 through the grouting pipe 1-3, and the prestressed anchor assembly 1 and the concrete are subjected to coordinated force.

[0058] S7, dismantle the construction baffle and pour the asphalt pavement layer 14 of the whole bridge;

[0059] S8. After the bridge has been in operation for many years, repeat step S6 to increase the boundary constraints of the original bridge 11 and the spliced ​​bridge 9, and strengthen the tensioning force of the main and auxiliary steel ropes to form a rigid truss. Specifically, apply tensioning force to the main rope 3-2, and the tensioning force is 0.15P. At the same time, the rigidity of the auxiliary rope 3-5 increases under the action of the main rope 3-2, thereby increasing the boundary constraints of the original bridge 11 and the spliced ​​bridge 9. The rigid truss formed by the tensioning of the original bridge 11 and the spliced ​​bridge 9 improves the load-bearing capacity of the old bridge in both the lateral and longitudinal directions, and enhances the coordinated force performance of the whole bridge.

[0060] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0061] Although this article uses more terms corresponding to the figure marks in the figures, it does not exclude the possibility of using other terms; these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A device for connecting the new and old bridges in a horizontal direction to widen, reinforce and lift loads without interrupting traffic, characterized in that: include: Original bridge (11); The spliced ​​bridge (9) is provided with a cantilever assembly (2) on the side facing the original bridge (11); A prestressed anchor assembly (1) is fixed on the original bridge (11), and the prestressed anchor assembly (1) is connected to the cantilever assembly (2) so that the original bridge (11) and the spliced ​​bridge (9) are connected; A tensioning rope assembly (3) is connected to the prestressed anchor assembly (1). The tensioning rope assembly (3) applies a tensioning force to the prestressed anchor assembly (1) to reduce the distance between the original bridge (11) and the spliced ​​bridge (9), so as to eliminate the distance change between the original bridge (11) and the spliced ​​bridge (9) caused by traffic through the tensioning force.

2. The device for connecting the new and old bridges in a horizontal direction without interrupting traffic according to claim 1 is characterized in that: The tensioning rope assembly (3) comprises a main rope (3-2) for applying tensioning force and an auxiliary rope (3-5) for transmitting the tensioning force, and two ends of the auxiliary rope (3-5) are respectively connected to the main rope (3-2) and the prestressed anchor assembly (1).

3. The device for connecting the new and old bridges in a horizontal direction without interrupting traffic according to claim 2 is characterized in that: A force converter (3-3) is fixed on the original bridge (11), and the main rope (3-2) is movably installed on the original bridge (11) through the force converter (3-3). The main rope (3-2) is subjected to force bending inside the force converter (3-3).

4. The device for connecting the new and old bridges in a horizontal manner for widening, reinforcing and lifting without interrupting traffic according to claim 3 is characterized in that: When the main rope (3-2) is not subjected to tension, the main rope (3-2) is bent at an angle a=2arccos(S / 2L) under the action of the auxiliary rope (3-5), wherein a is the bending angle of the main rope (3-2) under the action of the auxiliary rope (3-5), S is the spacing between adjacent force converters (3-3), and L is the span length of the spliced ​​bridge (9).

5. The device for connecting the new and old bridges in a horizontal direction without interrupting traffic according to claim 2 is characterized in that: A guide member (3-4) is installed on the spliced ​​bridge (9), and the auxiliary rope (3-5) is connected to the prestressed anchor assembly (1) through the guide member (3-4), so that the tensioning force of the auxiliary rope (3-5) on the prestressed anchor assembly (1) is arranged along the axial direction of the prestressed anchor assembly (1).

6. The device for transversely widening, reinforcing and loading connection of new and old bridges without interrupting traffic according to claim 1 is characterized in that: The prestressed anchor assembly (1) comprises an anchor rod (1-1) and a limit nut (1-2); the anchor rod (1-1) is fixedly connected to the original bridge (11), and the anchor rod (1-1) is passed through the cantilever assembly (2); the limit nut (1-2) is installed on the anchor rod (1-1) through a thread, and the limit nut (1-2) is adapted to the cantilever assembly (2) to maintain the spacing between the original bridge (11) and the spliced ​​bridge (9).

7. The device for transversely widening, reinforcing and loading connection of new and old bridges without interrupting traffic according to claim 6 is characterized in that: An end steel plate (4) is connected to the tail of the anchor rod (1-1), and a connecting steel bar (13) is provided on the outer side of the end steel plate (4) and is connected to the cantilever steel bar (5) in the original bridge (11) via the connecting steel bar (13).

8. The device for connecting the new and old bridges in a horizontal manner for widening, reinforcing and lifting without interrupting traffic according to claim 6 is characterized in that: The cantilever assembly (2) is provided with a cantilever vertical plate (2-2), the anchor rod (1-1) is arranged through the cantilever vertical plate (2-2), and the limit nut (1-2) is abutted against a side wall of the cantilever vertical plate (2-2) facing away from the original bridge (11).

9. The device for connecting the new and old bridges in a horizontal direction without interrupting traffic according to claim 1 is characterized in that: The cantilever assembly (2) is connected to a connecting transverse plate (2-1), the connecting transverse plate (2-1) is located between the outer side wall of the cantilever vertical plate (2-2) and the side wall of the original bridge (11), and a shear nail (6) is fixed on the connecting transverse plate (2-1).

10. A construction method for a transverse widening, reinforcement and loading connection device for a new and old bridge without interrupting traffic, characterized in that: The construction method is used to construct the non-interruption traffic transverse widening reinforcement and loading connection device for the new and old bridges as described in any one of claims 1 to 9, and comprises the following steps: S1, setting a construction baffle on the original bridge (11), chiseling away the cantilever concrete of the original bridge (11), and retaining the cantilever steel bars; S2, hoisting and erecting the spliced ​​bridge (9), and adjusting the position of the spliced ​​bridge (9) to ensure the position accuracy between the spliced ​​bridge (9) and the original bridge (11); S3, welding the cantilever assembly (2) on the spliced ​​bridge (9); S4, installing the prestressed anchor assembly (1), fixing the prestressed anchor assembly (1) on the cantilever steel bar, and passing the prestressed anchor assembly (1) through the cantilever assembly (2), and pouring concrete in the joint between the original bridge (11) and the spliced ​​bridge (9); S5, connecting the tensioning rope assembly (3) and the prestressed anchor assembly (1); S6, during the concrete solidification process, by applying tensioning force to the tensioning rope assembly (3), the distance between the original bridge (11) and the spliced ​​bridge (9) is reduced, the compressive stress of the concrete between the original bridge (11) and the spliced ​​bridge (9) is increased, and the influence of external factors on the distance between the original bridge (11) and the spliced ​​bridge (9) and the tensile strength of the concrete during the construction process is eliminated, and the prestressed anchor assembly (1) is fixed after the concrete solidifies; S7, remove the construction baffles and pour the asphalt pavement layer of the entire bridge (14); S8, after the bridge has been in operation for many years, step S6 is repeated to increase the boundary constraints and coordinated force stiffness of the original bridge (11) and the spliced ​​bridge (9).

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