A bridge widening structure and its construction method

Abstract

The present invention relates to the technical field of bridges, and specifically discloses a bridge widening structure and a construction method thereof. The bridge widening structure comprises a supporting assembly and a cable, wherein the supporting assembly comprises a jacking device, a supporting seat is installed at one end of the jacking device, a bridge bearing is installed at the other end of the jacking device, the bridge bearing is fixedly connected to the middle of the cable at a position away from the jacking device, the supporting seat is fixedly installed on the bridge pier, the bridge bearing is located below the jacking device, and the two ends of the cable are respectively fixedly connected to two wing plates of the bridge deck, and the length of the jacking device becomes large so that the cable is tightened. The bridge widening structure improves the stability of the bridge deck by limiting the tilting of the bridge deck, and the construction method of the bridge widening structure does not need to restrict the passage of vehicles, has little impact on the passage efficiency of the bridge, and has a short construction time.

Description

Technical Field

[0001] The invention relates to the technical field of bridges, and in particular to a bridge widening structure and a construction method thereof. Background Art

[0002] With the rapid development of social economy and the continuous growth of transportation demand, the traffic capacity of many bridges is difficult to meet current and future traffic needs. In order to reduce traffic congestion, improve the traffic capacity of bridges and improve traffic efficiency, bridge widening has become a common solution.

[0003] There are three main methods for widening a bridge: adding an additional bridge and overall widening. An additional bridge requires the construction of new pile foundations and bridge decks, and the connection problem between the old and new bridge decks needs to be solved. The construction cost is high and the construction time is long. Overall widening widens the bridge deck without destroying the integrity of the bridge deck, but it will cause the bridge's anti-tilt ability to decrease. The existing technology generally solves the problem of decreased anti-tilt ability of the bridge by widening the piers or dismantling the existing piers and rebuilding them. During the construction process, it is necessary to restrict or interrupt vehicle traffic, which affects the traffic efficiency of the bridge and takes a long time to build. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a bridge widening structure and a construction method thereof. The bridge widening structure limits the warping of the bridge deck and thus improves the stability of the bridge deck. The construction method of the bridge widening structure does not need to restrict the passage of vehicles, has little impact on the traffic efficiency of the bridge, and has a short construction time.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a bridge widening structure, comprising a supporting assembly and a cable, the supporting assembly comprising a jacking device, a supporting seat being installed at one end of the jacking device, a bridge bearing being installed at the other end of the jacking device, and the bridge bearing being fixedly connected to a position away from the jacking device and the middle of the cable.

[0006] The support seat is fixedly installed on the bridge pier, the bridge support is located below the jacking device, and the two ends of the cable are respectively fixedly connected to the two wing plates of the bridge deck, and the length of the jacking device becomes larger so that the cable is tightened.

[0007] As a preferred technical solution of the present invention, it also includes a first container, which has a closed accommodating space. The jacking device is a hydraulic jack, and the oil port of the hydraulic jack is connected to the bottom of the accommodating space through a connecting pipe, and a first valve is installed on the connecting pipe.

[0008] Wherein, hydraulic oil is injected into the first container, the ratio of the volume of the hydraulic oil in the accommodating space to the volume of the air in the accommodating space is 1:1-10, and the air pressure of the air in the accommodating space is 2.0-5.0 atmospheres.

[0009] As a preferred technical solution of the present invention, it also includes a second container, which has a accommodating space, the inner cavity of the connecting pipe is connected to one port of the second valve, the other port of the second valve is connected to the accommodating space, and the second valve is located between the hydraulic jack and the first valve.

[0010] The opening and closing state of the second valve is opposite to the opening and closing state of the first valve.

[0011] As a preferred technical solution of the present invention, it also includes two limiting components, and the bridge support is located between the two limiting components.

[0012] Among them, the two limit assemblies are fixedly installed on the bridge pier, the height of the bottom side of the limit assemblies is greater than the height of the bottom side of the bridge support, and the bottom side of the limit assemblies is in contact with the cable.

[0013] As a preferred technical solution of the present invention, it also includes an arc frame arranged between the bridge support and the cable, the arc frame is installed on the bottom side of the bridge support, and the bottom side of the arc frame is fixedly connected to the middle part of the cable.

[0014] As a preferred technical solution of the present invention, the bridge bearing includes an upper bearing plate, a lower bearing plate, an upper bearing installed on the bottom side of the upper bearing plate, and a lower bearing installed on the top side of the lower bearing plate, and a plurality of elastic parts are installed between the upper bearing plate and the lower bearing plate.

[0015] As a preferred technical solution of the present invention, a limit frame is installed on the support seat so that the moving direction of the upper support plate and the lifting direction of the lifting device are the same.

[0016] As a preferred technical solution of the present invention, the first valve is a regulating valve.

[0017] On the other hand, a bridge widening structure construction method is also provided, which uses the above-mentioned bridge widening structure and includes the following steps:

[0018] The two flanges of the bridge deck are chiseled out simultaneously, and the steel bars in the flanges are retained.

[0019] The exposed steel bars of the wing plate and the extended steel bars of the wing plate are fixedly connected, and the concrete widening of the wing plate is poured using a mold.

[0020] Maintain the pouring location.

[0021] The support seat is fixedly installed on the bridge pier, the bridge support is located below the jacking device, and the two ends of the cable are fixedly connected to the two wing plates of the bridge deck respectively.

[0022] Adjust the length of the lifting device to keep the cable at the set tension.

[0023] On the other hand, a bridge widening structure construction method is also provided, which uses the above-mentioned bridge widening structure and includes the following steps:

[0024] The two flanges of the bridge deck are chiseled out simultaneously, and the steel bars in the flanges are retained.

[0025] The exposed steel bars of the wing plate and the extended steel bars of the wing plate are fixedly connected, and the concrete widening of the wing plate is poured using a mold.

[0026] Maintain the pouring location.

[0027] The support seat is fixedly installed on the bridge pier, the bridge support is located below the jacking device, and the two ends of the cable are fixedly connected to the two wing plates of the bridge deck respectively.

[0028] Air is injected into the accommodation space of the first container, the air pressure in the accommodation space of the first container is 2.0-5.0 atmospheres, and the cable is at a set tension level.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The bridge widening structure of the example of the present invention, on the one hand, the bridge bearing, the jacking device and the support seat limit the tilting of the bridge deck through the cable, thereby improving the stability of the bridge deck; on the other hand, the length of the cable changes due to temperature changes, the hydraulic oil in the hydraulic jack and the accommodating space flows, and the compressed air in the accommodating space makes the lifting force of the hydraulic jack change less, thereby reducing the number of inspections by staff, reducing the workload of staff, and avoiding damage to the cable; on the other hand, the hydraulic oil in the accommodating space is used as a power source to periodically tighten or relax the cable, thereby achieving the detachment of the cable from the ice, reducing the vibration or galloping of the cable caused by the icing of the cable, and improving the safety of the cable.

[0031] 2. In the bridge widening structure of the example of the present invention, the bridge deck drives the cable to move during the lateral movement, and the bridge supports keep the cable in a taut state to prevent the lateral movement of the bridge deck from damaging the cable.

[0032] 3. In the bridge widening structure of the example of the present invention, the bridge support is located between two limit assemblies, and the two limit assemblies share the pressure borne by the supporting assembly, thereby reducing the hydraulic pressure of the hydraulic oil required during the extension process of the hydraulic jack.

[0033] 4. In the bridge widening structure of the example of the present invention, the arc frame reduces the bending degree of the cable at the jacking device. The arc frame and the two limit assemblies make the direction of the force exerted by the cable on the jacking device the same as the elongation direction of the jacking device, thereby avoiding damage to the jacking device.

[0034] 5. The bridge widening structure of the example of the present invention adjusts the opening of the first valve to adjust the flow rate of the hydraulic oil in the connecting pipe, thereby limiting the upward rotation speed of the bridge deck and the downward speed of the bridge deck after it is tilted, reducing the impact on the bridge deck during the tilting process.

[0035] 6. The bridge widening construction method exemplified in the present invention does not need to restrict vehicle traffic during the widening of the bridge deck, has little impact on the traffic efficiency of the bridge, and has a short construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the main structure of the present invention in an installed state;

[0037] Figure 2 It is a bottom view structural schematic diagram of the present invention in an installed state;

[0038] Figure 3 It is a front view structural schematic diagram of the present invention in an installed state;

[0039] Figure 4 It is a front view structural schematic diagram of the present invention;

[0040] Figure 5 for Figure 4 A schematic diagram of the structure at A;

[0041] Figure 6 It is a schematic diagram of the support assembly structure of the present invention.

[0042] In the figure: 1: limit assembly, 2: support assembly, 21: support seat, 22: jacking device, 23: bridge support, 24: arc frame, 25: limit frame, 26: elastic member, 3: first container, 4: pull cable, 5: connecting pipe, 6: first valve, 7: second valve, 8: second container. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] Embodiment 1:

[0045] See also Figure 1-Figure 6 This embodiment discloses a bridge widening structure, including a support assembly 2 and a cable 4, the support assembly 2 includes a jacking device 22, a support seat 21 is installed at one end of the jacking device 22, and a bridge bearing 23 is installed at the other end of the jacking device 22, and the bridge bearing 23 is fixedly connected to the middle of the cable 4 away from the jacking device 22.

[0046] Among them, the support seat 21 is fixedly installed on the bridge pier, the bridge bearing 23 is located below the jacking device 22, and the two ends of the cable 4 are respectively fixedly connected to the two wing plates of the bridge deck. The staff adjusts the jacking device 22, and the jacking device 22 is lifted to make the cable 4 taut.

[0047] Furthermore, the lifting device 22 is a hydraulic jack, a screw-type lifting mechanism or a lever-type lifting mechanism commonly used in the prior art.

[0048] The working process and principle of this embodiment are:

[0049] Remove the guardrails on the wing panels, bridge deck paving and other parts that affect the widening construction, and then simultaneously chisel off the two wings of the bridge deck to the set width to ensure uniform force on both sides of the bridge deck width, and retain the steel bars in the chiseled-out positions of the wing panels. The exposed steel bars of the wing panels and the external wing panel extension steel bars are fixed and connected, and the wing panels are widened by pouring concrete with a mold, and the external wing panel extension steel bars are poured in concrete. The pouring position is maintained, and then the road surface is paved at the pouring position.

[0050] The support seat 21 is fixedly installed on the bridge pier, the bridge support 23 is located below the jacking device 22, and the two ends of the cable 4 are fixedly connected to the two wing plates of the bridge deck respectively. The staff adjusts the length of the jacking device 22 to make the cable 4 at a set tension level.

[0051] In the prior art: when vehicles are driving on a bridge deck, when multiple loaded vehicles are driving close to one side of the bridge deck, it is easy to cause excessive force on one side of the bridge deck, thereby causing the bridge deck to roll over. The bridge support 23, jacking device 22 and support seat 21 in the bridge widening structure limit the tilting of the bridge deck through the cable 4, thereby improving the stability of the bridge deck.

[0052] In the prior art, the bridge deck may move laterally due to thermal expansion and contraction or the frequent passage of heavy-loaded vehicles. The bridge deck moves laterally, driving the cable 4 to move. The bridge support 23 keeps the cable 4 taut to prevent the cable 4 from being damaged by the lateral movement of the bridge deck.

[0053] In the prior art, changes in ambient temperature in different seasons cause changes in the length of the cable 4, causing changes in the tension of the cable 4. Workers regularly measure the tension of the cable 4 and adjust the elongated length of the jacking device 22 to keep the cable 4 at a set tension.

[0054] Embodiment 2:

[0055] like Figure 1-Figure 5As shown, this embodiment discloses a bridge widening structure, and its structure is substantially the same as that of the first embodiment, except that this embodiment further includes a first container 3, and a closed accommodating space is provided in the first container 3. The jacking device 22 is a hydraulic jack, and the oil port of the hydraulic jack and the bottom of the accommodating space are connected through a connecting pipe 5, and a first valve 6 is installed on the connecting pipe 5.

[0056] The first container 3 is filled with hydraulic oil, the ratio of the volume of the hydraulic oil in the accommodating space to the volume of the air in the accommodating space is 1:1-10, and the air pressure of the air in the accommodating space is 2.0-5.0 atmospheres.

[0057] The working process and principle of this embodiment are:

[0058] The compressed air in the accommodating space maintains the hydraulic pressure of the hydraulic oil in the accommodating space within the set range. The length of the cable 4 changes due to changes in ambient temperature in different seasons. The hydraulic oil in the hydraulic jack and the accommodating space flows. The compressed air in the accommodating space makes the lifting force of the hydraulic jack change little, thereby reducing the number of inspections by staff and reducing the workload of staff.

[0059] Embodiment three:

[0060] like Figure 4 , Figure 5 As shown, this embodiment discloses a bridge widening structure, and its structure is roughly the same as that of the second embodiment, except that this embodiment also includes a second container 8, and the second container 8 is provided with a accommodating space, the inner cavity of the connecting pipe 5 is connected with one port of the second valve 7, and the other port of the second valve 7 is connected with the accommodating space, and the second valve 7 is located between the hydraulic jack and the first valve 6.

[0061] The opening and closing state of the second valve 7 is opposite to the opening and closing state of the first valve 6 .

[0062] The working process and principle of this embodiment are:

[0063] In the prior art, when the temperature drops below freezing, the moisture on the surface of the cable 4 will freeze, especially in conditions of fog, rain, snow, and strong winds. The cable 4 is more likely to adhere to moisture and freeze quickly at low temperatures. The ice attached to the surface of the cable 4 will change the vibration characteristics of the cable 4, resulting in changes in the resonant frequency, which may cause vibration problems related to wind action, such as flutter or galloping.

[0064] When the staff finds ice on the cable 4 during the inspection, the staff closes the first valve 6 and then opens the second valve 7. The taut cable 4 shortens the length of the hydraulic jack, and the oil in the hydraulic jack flows into the second container 8 through the second valve 7. The stretched length of the cable 4 decreases, causing the ice on the cable 4 to break. The staff closes the second valve 7 and then opens the first valve 6. The hydraulic jack restores the taut state of the cable 4, and the stretched length of the cable 4 increases. The above operations are repeated to remove the ice on the cable 4.

[0065] Furthermore, the volume of the hydraulic oil in the first container 3 is 20-200 times the volume of the hydraulic oil flowing out when the hydraulic jack is shortened once.

[0066] Embodiment 4:

[0067] like Figure 1-Figure 4 As shown, this embodiment discloses a bridge widening structure, and its structure is substantially the same as that of the third embodiment, except that this embodiment further includes two limit assemblies 1 , and the bridge support 23 is located between the two limit assemblies 1 .

[0068] Both limit assemblies 1 are fixedly installed on the bridge pier. The height of the bottom side of the limit assembly 1 is greater than the height of the bottom side of the bridge support 23, and the bottom side of the limit assembly 1 is in contact with the cable 4. The two limit assemblies 1 share the pressure borne by the support assembly 2, reducing the hydraulic pressure of the hydraulic oil required during the extension process of the hydraulic jack.

[0069] Furthermore, the limiting assembly 1 is a fixing rod fixed on the bridge pier, and the fixing rod is arranged horizontally.

[0070] Furthermore, the limiting assembly 1 also includes a rib rod, one end of the rib rod is fixed on the bridge pier, and the other end of the rib rod is fixed on the fixing rod, and the rib rod improves the bending resistance of the fixing rod.

[0071] Embodiment five:

[0072] like Figure 4 , Figure 6 As shown, this embodiment discloses a bridge widening structure, and its structure is substantially the same as that of the second embodiment, except that this embodiment further includes an arc frame 24 arranged between the bridge support 23 and the cable 4, and the arc frame 24 is fixedly mounted on the bottom side of the bridge support 23, and the bottom side of the arc frame 24 is fixedly connected to the middle part of the cable 4, and the arc frame 24 reduces the bending degree of the cable 4 at the jacking device 22, and the arc frame 24 and the two limit assemblies 1 make the direction of the force exerted by the cable 4 on the jacking device 22 the same as the elongation direction of the jacking device 22, thereby avoiding damage to the jacking device 22.

[0073] Embodiment six:

[0074] like Figure 4 , Figure 5 , Figure 6 As shown, this embodiment discloses a bridge widening structure, and its structure is substantially the same as that of the second embodiment, except that, in this embodiment, the first valve 6 is a regulating valve, and when one wing plate of the bridge deck is tilted, the force exerted by the cable 4 on the hydraulic jack through the bridge support 23 increases, the length of the hydraulic jack becomes shorter, and the hydraulic oil in the hydraulic jack flows into the accommodating space through the regulating valve, and the first valve 6 limits the flow rate of the hydraulic oil in the connecting pipe 5, thereby reducing the impact on the cable 4 and avoiding damage to the cable 4.

[0075] The opening of the first valve 6 is adjusted to adjust the flow rate of the hydraulic oil in the connecting pipe 5, thereby limiting the tilting speed of the bridge plate and the descending speed of the bridge plate after tilting, thereby reducing the impact on the bridge plate.

[0076] Embodiment seven:

[0077] like Figure 1-Figure 4 , Figure 6 As shown, this embodiment discloses a bridge widening structure, and its structure is roughly the same as that of the first embodiment, except that the bridge bearing 23 of this embodiment includes an upper bearing plate, a lower bearing plate, an upper bearing fixedly mounted on the bottom side of the upper bearing plate, and a lower bearing fixedly mounted on the top side of the lower bearing plate, and a plurality of elastic members 26 are installed between the upper bearing plate and the lower bearing plate, and the elastic members 26 are springs, elastic ropes or elastic rods, and the bottom side of the upper bearing and the top side of the lower bearing are slidably fitted, and the elastic members 26 keep the upper bearing and the lower bearing in a fitted state to prevent dust from entering between the upper bearing and the lower bearing and affecting the relative sliding of the upper bearing and the lower bearing.

[0078] Embodiment eight:

[0079] like Figure 6 As shown, this embodiment discloses a bridge widening structure, and its structure is substantially the same as that of the seventh embodiment, except that a limit frame 25 is installed on the support seat 21 of this embodiment so that the moving direction of the upper support plate and the lifting direction of the lifting device 22 are the same, and the limit frame 25 prevents the lifting device 22 from being deformed or damaged.

[0080] In the prior art, the force applied to the lifting device 22 is inconsistent with the normal working axis of the lifting device 22, which will cause the lifting device 22 to bear uneven force, which may cause the lifting device 22 to deform or be damaged, especially under heavy load conditions.

[0081] Embodiment nine:

[0082] like Figure 1-Figure 6 As shown, this embodiment discloses a bridge widening structure construction method, which uses the bridge widening structure of embodiment 1 and includes the following steps:

[0083] The two flanges of the bridge deck are chiseled out simultaneously, and the steel bars in the flanges are retained.

[0084] The exposed steel bars of the wing plate are fixedly connected with the steel bars for extension of the wing plate, and the concrete widening of the wing plate is poured using a mold, and the pouring position is maintained.

[0085] The support seat 21 is fixedly installed on the bridge pier, the bridge support 23 is located below the jacking device 22, and the two ends of the cable 4 are fixedly connected to the two wing plates of the bridge deck respectively.

[0086] The length of the lifting device 22 is adjusted to make the tension of the cable 4 to be set.

[0087] The principle of this embodiment is:

[0088] Fix the support seat 21 on the bridge pier, fix the two ends of the cable 4 to the two wing plates of the bridge deck respectively, then fix the middle part of the cable 4 to the bottom of the jacking device 22, adjust the length of the jacking device 22 to make the cable 4 at a set tension level, and the bridge bearing 23, the jacking device 22 and the support seat 21 restrain the uplift of the bridge deck through the cable 4, thereby improving the stability of the bridge deck.

[0089] The bridge widening structure construction method does not need to restrict vehicle traffic during the bridge deck widening process, has little impact on the traffic efficiency of the bridge, and has a short construction time.

[0090] Embodiment ten:

[0091] like Figure 1-Figure 6 As shown, this embodiment discloses a bridge widening structure construction method, which uses the bridge widening structure of any one of the second to eighth embodiments, including the following steps:

[0092] The two flanges of the bridge deck are chiseled out simultaneously, and the steel bars in the flanges are retained.

[0093] The exposed steel bars of the wing plate and the extended steel bars of the wing plate are fixedly connected, and the concrete widening of the wing plate is poured using a mold, and the pouring position is maintained.

[0094] The support seat 21 is fixedly installed on the bridge pier, the bridge support 23 is located below the jacking device 22, and the two ends of the cable 4 are fixedly connected to the two wing plates of the bridge deck respectively.

[0095] Air is injected into the accommodation space of the first container 3 , the air pressure in the accommodation space of the first container 3 is 2.0-5.0 atmospheres, and the cable 4 is at a set tension level.

[0096] The support seat 21 is fixed on the bridge pier, and the two ends of the cable 4 are fixedly connected to the two wing plates of the bridge deck respectively, and then the middle part of the cable 4 and the bottom of the jacking device 22 are fixedly connected. The bridge support 23, the jacking device 22 and the support seat 21 restrain the uplifting of the bridge deck through the cable 4, thereby improving the stability of the bridge deck. When the length of the cable 4 changes, the hydraulic oil in the hydraulic jack and the accommodating space flows, and the compressed air in the accommodating space makes the lifting force of the hydraulic jack change less, thereby reducing the number of inspections by the staff and reducing the workload of the staff.

[0097] The bridge widening structure construction method does not need to restrict vehicle traffic during the bridge deck widening process, has little impact on the traffic efficiency of the bridge, and has a short construction time.

[0098] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A bridge widening structure, characterized in that: The invention comprises a support assembly (2) and a cable (4), wherein the support assembly (2) comprises a lifting device (22), a support seat (21) is installed at one end of the lifting device (22), a bridge support (23) is installed at the other end of the lifting device (22), and the bridge support (23) is fixedly connected to the middle of the cable (4) at a position away from the lifting device (22); It also comprises a first container (3), wherein a closed accommodating space is provided in the first container (3), the jacking device (22) is a hydraulic jack, the oil port of the hydraulic jack and the bottom of the accommodating space are connected via a connecting pipe (5), and a first valve (6) is installed on the connecting pipe (5); It also comprises a second container (8), wherein a containing space is provided in the second container (8), the inner cavity of the connecting pipe (5) is in communication with one end of the second valve (7), the other end of the second valve (7) is in communication with the containing space, and the second valve (7) is located between the hydraulic jack and the first valve (6); The bridge bearing (23) comprises an upper bearing plate, a lower bearing plate, an upper bearing installed on the bottom side of the upper bearing plate, and a lower bearing installed on the top side of the lower bearing plate, a plurality of elastic members (26) are installed between the upper bearing plate and the lower bearing plate, and the bottom side of the upper bearing and the top side of the lower bearing are slidably fitted; The support seat (21) is fixedly mounted on the bridge pier, the bridge support (23) is located below the jacking device (22), and the two ends of the cable (4) are respectively fixedly connected to the two wing plates of the bridge deck, and the length of the jacking device (22) is increased so that the cable (4) is tightened; The first container (3) is filled with hydraulic oil, the ratio of the volume of the hydraulic oil in the accommodating space to the volume of the air in the accommodating space is 1:1-10, and the air pressure in the accommodating space is 2.0-5.0 atmospheres; The opening and closing state of the first valve (6) is opposite to the opening and closing state of the second valve (7); When ice forms on the cable (4), the first valve (6) is closed and then the second valve (7) is opened. The cable (4) in a taut state shortens the length of the hydraulic jack. The oil in the hydraulic jack flows into the second container (8) through the second valve (7). The stretched length of the cable (4) decreases, causing the ice on the cable (4) to break. The second valve (7) is closed and then the first valve (6) is opened. The hydraulic jack restores the cable (4) to a taut state. The stretched length of the cable (4) increases. The above operation is repeated to detach the ice from the cable (4). The volume of the hydraulic oil in the first container (3) is 20-200 times the volume of the hydraulic oil flowing out when the hydraulic jack is shortened once.

2. The bridge widening structure according to claim 1, characterized in that: It also includes two limiting assemblies (1), wherein the bridge support (23) is located between the two limiting assemblies (1); Wherein, the two limit assemblies (1) are fixedly mounted on the bridge pier, the height of the bottom side of the limit assemblies (1) is greater than the height of the bottom side of the bridge support (23), and the bottom side of the limit assemblies (1) is in contact with the cable (4).

3. The bridge widening structure according to claim 1, characterized in that: It also includes an arc frame (24) arranged between the bridge support (23) and the cable (4), wherein the arc frame (24) is installed on the bottom side of the bridge support (23), and the bottom side of the arc frame (24) is fixedly connected to the middle part of the cable (4).

4. The bridge widening structure according to claim 1, characterized in that: The first valve (6) is a regulating valve.

5. The bridge widening structure according to claim 1, characterized in that: The support seat (21) is provided with a limit frame (25) which enables the moving direction of the upper support plate to be the same as the lifting direction of the lifting device (22).

6. A method for constructing a bridge widening structure, using the bridge widening structure according to claim 1, characterized in that: The following steps are involved: Simultaneously, the two flanges of the bridge deck are chiseled off to a set width, and the exposed steel bars of the flanges are retained; The exposed steel bars of the wing plate are fixedly connected with the steel bars extending the wing plate, and the wing plate is widened and poured with concrete using a mold; Maintain the pouring location; The support seat (21) is fixedly mounted on the bridge pier, the bridge support (23) is located below the jacking device (22), and the two ends of the cable (4) are respectively fixedly connected to the two wing plates of the bridge deck; Air is injected into the accommodation space of the first container (3), the air pressure in the accommodation space of the first container (3) is 2.0-5.0 atmospheres, and the pull cable (4) is at a set tension level.

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