Simply supported bridge reinforcement structure and reinforcement method based on reaction frame traction

Abstract

The present invention relates to a simply supported bridge reinforcement structure based on reaction frame traction and a reinforcement method thereof, wherein a bridge plate is erected between the abutments of the two abutments of the original simply supported beam bridge structure, the reinforcement structure comprises a reinforcement top plate and a reaction frame traction device, the reaction frame traction device is arranged on the ground, comprises a counterweight frame and at least one group of reaction push rod parts arranged in the counterweight frame, the reaction push rod parts comprise a pulley shaft group, a static crossbeam, a push-up mechanism and a dynamic crossbeam; the reinforcement structure converts the horizontal traction of multiple groups of steel wire ropes into a continuous, stable and uniform downward pulling force on the reinforcement top plate through the reaction frame, provides elastic potential energy to the bow-shaped reinforced corrugated top plate, provides a stable and safe reinforcement construction environment for the simply supported bridge, thereby realizing the reinforcement and loading of old bridges and dangerous bridges, and solving the problems of bridge plate sinking and central cracking of old simply supported bridges.

Description

Technical Field

[0001] The present invention relates to the technical field of beam bridge load-lifting reinforcement, and in particular to a simply supported bridge reinforcement structure based on reaction frame traction and a reinforcement method thereof. Background Art

[0002] A simply supported beam bridge is a statically determinate structure consisting of a single beam supported at each end on piers. It is the earliest and most widely used type of beam bridge. It is adaptable to various geological conditions, has a simple structure, and can be easily standardized and assembled into prefabricated components, making it easy to manufacture and install. This makes it the most widely used type of beam bridge.

[0003] Due to the increasing traffic pressure and the increasing service life of existing bridges, a large number of old and dangerous simply supported beam bridges have appeared on my country's highways and local roads. Through investigations on different types of bridge defects, it was found that poor durability, cracks, single plate stress, surface defects, serious damage to the bridge deck pavement, freeze-thaw damage, bridge head subsidence, wing wall bulging, pier scouring and foundation hollowing are the most common defects, which reduce driving comfort and make the direct destructive effect of vehicles on bridge structures more serious. In severe cases, they will directly cause serious accidents such as vehicle loss of control and bridge collapse.

[0004] Therefore, the maintenance and reinforcement of simply supported beam bridges has gradually become a hot topic, and the number of bridges that need to be reinforced and strengthened and have their bearing capacity improved is increasing. Most of the reinforcement methods in the existing technology can only unilaterally stabilize the bridge's ability to bear live loads, but are of no help to the beam body in resisting its own weight and increasing its bearing capacity. It is urgent to propose a reinforcement structure for simply supported beam bridges to facilitate and reliably reinforce existing bridges. Summary of the Invention

[0005] The present invention provides a simply supported bridge reinforcement structure based on reaction frame traction and a reinforcement method thereof, which solve the problems of great difficulty in construction, low construction efficiency and poor reinforcement effect of the reinforcement engineering of simply supported beam bridges in the prior art.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A simply supported bridge reinforcement structure based on reaction frame traction is provided, wherein a bridge plate is provided between the abutment caps of the two abutments of the original simply supported beam bridge structure, and the reinforcement structure comprises a reinforcement top plate and a reaction frame traction device;

[0008] The reinforced top plate is fixedly arranged between the abutments or abutment side walls on both sides, and the reinforced top plate is bent upward into a bow-shaped structure to provide an upward supporting force for the bridge plate;

[0009] A plurality of connecting rings are provided on the lower end surface of the reinforced top plate, and the connecting rings are connected to the reaction frame traction device through traction ropes;

[0010] The reaction frame traction device is arranged on the ground, including a counterweight frame and at least one set of reaction force push rod parts arranged in the counterweight frame, and the reaction force push rod parts include a pulley shaft group, a static crossbeam, a push mechanism and a dynamic crossbeam;

[0011] The static crossbeam is fixed in the counterweight frame, and is provided with at least one set of traction rope through holes;

[0012] The pulley shaft assembly includes a pulley shaft and at least one set of fixed pulleys arranged on the pulley shaft, and the pulley shaft is arranged in a counterweight frame on one side of the static beam;

[0013] The pushing mechanism is connected to the static crossbeam, and the other end thereof is connected to the dynamic crossbeam, and the static crossbeam is parallel to the dynamic crossbeam;

[0014] The dynamic crossbeam is movably arranged in the counterweight frame, and the dynamic crossbeam can slide along the counterweight frame under the drive of the pushing mechanism;

[0015] One end of the traction rope is connected to the connecting ring, and the other end passes through the fixed pulley and the traction rope through hole in sequence and is fixedly connected to the dynamic crossbeam.

[0016] Furthermore, the counterweight frame includes two sets of longitudinal beams arranged in parallel, both sets of longitudinal beams are provided with slide rails, the dynamic crossbeams can slide along the slide rails, and both ends of the longitudinal beams are fixedly connected to the counterweight blocks.

[0017] Furthermore, the reaction force push rod parts are provided in two groups, and the two groups of reaction force push rod parts are symmetrically arranged in the counterweight frame.

[0018] Furthermore, the reaction force push rod parts are provided in two groups, and the two groups of reaction force push rod parts are sequentially arranged in the counterweight frame.

[0019] Furthermore, the pulley shaft is arranged between two groups of longitudinal beams, three groups of fixed pulleys are arranged on each pulley shaft, and each reaction force push rod part is connected to three traction ropes.

[0020] Furthermore, the pushing mechanism is a jack, and each reaction push rod portion is provided with two groups of jacks.

[0021] Furthermore, the reinforced top plate is a reinforced corrugated top plate.

[0022] Furthermore, a pressure-resistant block is arranged between the reinforced corrugated top plate and the bridge plate. The pressure-resistant block is a rectangular structure as a whole, and its upper end face is horizontal and fits tightly with the lower end face of the bridge plate, and its lower end face is an arc surface with a corrugated structure, which fits tightly with the upper end face of the reinforced corrugated top plate; the pressure-resistant block is a fast-setting pressure-resistant block, a rubber pressure-resistant block or a concrete pressure-resistant block, and the support replacement space formed by the reinforced corrugated top plate and the two ends of the bridge plate has a height of not less than 0.5m.

[0023] The simply supported bridge reinforcement method based on reaction frame traction includes the following steps:

[0024] Use a crane or jack to remove the bridge deck of the original simply supported beam bridge from the abutment;

[0025] A reinforced top plate is fixedly installed between the abutments on both sides. The reinforced top plate is curved into an arched structure, and the arch top of the reinforced top plate is higher than the plane where the lower end surface of the original bridge plate is located;

[0026] Arrange a reaction frame traction device on the ground directly below the reinforced top plate;

[0027] The traction ropes are connected to the multiple groups of connection rings at the lower end of the reinforced top plate respectively, and the other ends of the traction ropes are passed through the fixed pulleys and the traction rope through holes in sequence and then fixedly connected to the dynamic crossbeam;

[0028] The pushing mechanism is activated, and the pushing mechanism pushes the dynamic crossbeam to slide away from the static crossbeam. The dynamic crossbeam pulls multiple traction ropes to apply a continuous and uniform downward pulling force to the reinforced top plate, so that the arch of the reinforced top plate is equal to or lower than the plane of the lower end surface of the original bridge plate;

[0029] Install pressure-resistant blocks on the upper end of the reinforced corrugated roof and then re-install the original bridge slab;

[0030] The pushing mechanism is activated, and the pushing mechanism retracts the dynamic beam and slides it toward the static beam. Multiple traction ropes release the tension, and the reinforced top plate rebounds and arches upward, providing an upward supporting force to the original bridge plate.

[0031] Furthermore, it also includes reinforcing the side walls of the two abutments. The method of reinforcing the side walls of the two abutments includes anchoring the reinforcing vertical plates tightly against the abutment side walls or anchoring the reinforcing vertical plates at intervals to the abutment side walls and then grouting in the formed filling cavity.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. One embodiment of the present invention converts the horizontal traction of multiple groups of steel wire ropes into a downward pulling force on the reinforced corrugated top plate through a reaction frame. The downward pulling force is precisely controllable, continuous, stable and uniform, providing a stable and safe reinforcement construction environment for simply supported bridges, thereby achieving the reinforcement and load-lifting of old and dangerous bridges, and solving problems such as sinking and central cracking of bridge plates.

[0034] 2. In one embodiment of the present invention, the beam bridge reinforcement structure transmits a flexible supporting force of a large area to the bridge plate through the pressure-resistant blocks, thereby reducing the deformation problem of the reinforced corrugated top plate and the bridge plate caused by point force, preventing the development of cracks in the beam bridge under overload, and extending the service life of the reinforcement structure.

[0035] 3. In one embodiment of the present invention, an integral reinforcement structure of reinforced corrugated top plates and reinforced corrugated vertical plates is provided. The abutments on both sides are reinforced by reinforced corrugated vertical plates and concrete mortar, and the bridge slab is reinforced and loaded by reinforced corrugated top plates, thereby reducing the load burden of old simply supported beam bridges in all directions and improving the bridge reinforcement effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0037] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the overall structure of a reaction frame traction device according to an embodiment of the present invention;

[0039] Figure 3 yes Figure 2 A top view of

[0040] Figure 4 This is a schematic structural diagram of a pressure-resistant block according to an embodiment of the present invention;

[0041] In the figure, 1- abutment, 2- abutment cap, 3- bridge plate, 4- reinforced corrugated top plate, 5- pressure-resistant block;

[0042] 6-reaction frame traction device, 601-pulley shaft assembly, 602-static beam, 603-dynamic beam, 604-longitudinal beam, 605-counterweight, 606-jack;

[0043] 7-Wire rope. DETAILED DESCRIPTION

[0044] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0045] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this patent.

[0046] In the description of this patent, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "set" should be understood in a broad sense. For example, they can refer to fixed connection or set, detachable connection or set, or integral connection or set. Those skilled in the art will understand the specific meanings of the above terms in this patent based on the specific circumstances.

[0047] The patent previously applied for by the applicant, patent number: 202111506021.7, relates to a corrugated steel arch reinforcement structure of a simply supported beam bridge and its reinforcement method, which achieves the downward pulling of the reinforced top plate by lifting the load with a traction rope. This method is prone to uneven downward traction force, uncontrollable traction force, and even traction instability, resulting in deformation, bending and other accidents of the reinforced top plate.

[0048] In view of this, the basic idea of the present invention is to design a simply supported bridge reinforcement structure and reinforcement method based on reaction frame traction, and convert the horizontal traction into a continuous, stable and uniform downward pulling force on the reinforced corrugated top plate through the reaction frame, providing a convenient and safe reinforcement construction environment for simply supported bridges, thereby realizing the reinforcement and loading of old bridges and dangerous bridges, and solving problems such as sinking and central cracking of bridge plates.

[0049] Example 1:

[0050] See also Figure 1 The simply supported bridge reinforcement structure based on reaction frame traction is a structure in which a bridge plate 3 is erected between the abutments 2 of the two abutments 1 of the original simply supported beam bridge structure, and the reinforcement structure includes a reinforcement top plate and a reaction frame traction device 6;

[0051] The reinforced top plate is fixedly arranged between the abutments 1 or the side walls of the abutments on both sides, and the reinforced top plate is bent into a bow-shaped structure. In this embodiment, the reinforced top plate is a reinforced corrugated top plate 4, and a pressure-resistant block 5 is arranged on the top of the reinforced corrugated top plate. The structure of the pressure-resistant block 5 is shown in FIG. Figure 4 , which is pressed downward by the bridge plate 3 and deformed, and provides an upward supporting force to the bridge plate 3 through the pressure-resistant block 5; in other embodiments, the reinforced top plate can also be a flat steel plate or a hollow steel plate.

[0052] In this embodiment, the two ends of the reinforced corrugated roof 4 are bent vertically downward to form connecting ends, which are fixed between the side walls of the abutments 1 on both sides via chemical anchor bolts. In other embodiments, the reinforced corrugated roof 4 can also be connected to the abutments 1 on both sides via pre-anchored caps. Regardless of the connection method, the curved surface of the reinforced corrugated roof and the two ends of the bridge slab form a bearing replacement space, which is used for workers to drill into and regularly replace bridge bearings after the bridge reinforcement project is completed. Therefore, the height of the bearing replacement space should not be less than 0.5m.

[0053] In this embodiment, six groups of connecting rings are provided on the central lower end surface of the reinforced corrugated top plate 4. The six groups of connecting rings are welded in two rows in the center of the reinforced corrugated top plate 4. The connecting rings are connected to the reaction frame traction device 6 through a traction rope. In this embodiment, the traction rope is a steel wire rope 7.

[0054] See also Figure 2 and Figure 3 The reaction frame traction device 6 is set on the ground, including a counterweight frame and two groups of reaction push rod parts arranged in the counterweight frame. The two groups of reaction push rod parts have exactly the same structure and are arranged in the counterweight frame in sequence. The reaction push rod parts include a pulley shaft group 601, a static beam 602, a pushing mechanism and a dynamic beam 603.

[0055] The counterweight frame includes two sets of parallel longitudinal beams 604, and slide rails are provided on the opposite sides of the two sets of longitudinal beams 604. The two ends of the longitudinal beams 604 are fixedly connected to the counterweight blocks 605. In this embodiment, the counterweight blocks 605 are concrete piers, and the two sets of parallel longitudinal beams 604 pass through several concrete piers at both ends of them. In other embodiments, the counterweight blocks can also be objects with a certain weight such as steel ingots or water horses.

[0056] The static crossbeam 602 is welded or bolted to two sets of parallel longitudinal beams 604. The static crossbeam 602 is a steel beam. Three sets of traction rope through holes are provided on the beam body of the static crossbeam 602 for passing the traction rope.

[0057] The dynamic crossbeam 603 is arranged in the slide rails of two sets of parallel longitudinal beams 604. The dynamic crossbeam 603 can slide in the two sets of parallel longitudinal beams 604. The static crossbeam 602 is arranged in parallel with the dynamic crossbeam 603.

[0058] In this embodiment, the pushing mechanism uses a jack 606, and each reaction push rod part is provided with two groups of jacks 606. The two groups of jacks 606 are arranged between the static beam 602 and the dynamic beam 603, and are arranged on both sides; the base of the jack 606 is fixedly connected to one side of the static beam 602, and the top of the jack 606 is fixedly connected to the dynamic beam 603. When the jack 606 is pushed forward or retracted, it can drive the dynamic beam 603 away from or closer to the static beam 602.

[0059] In this embodiment, the pulley shaft assembly 601 includes a pulley shaft and three groups of fixed pulleys fixedly arranged on the pulley shaft. The pulley shaft is fixedly arranged in two groups of parallel longitudinal beams 604, and the pulley shaft is located outside the static cross beam 602.

[0060] One end of each steel wire rope 7 is connected to the connecting ring of the reinforced corrugated top plate 4, and the other end of the steel wire rope 7 is passed through the fixed pulley and the traction rope through hole in sequence, and finally fixedly connected to the dynamic crossbeam 603. When the six groups of jacks 606 of the two groups of reaction push rod parts are started, the jacks 606 push the dynamic crossbeam 603 to slide along the slide rail in the direction away from the static crossbeam 602. The sliding distance and sliding speed of the dynamic crossbeam 603 can be accurately controlled by the stroke of the jacks 606, which in turn pulls the three steel wire ropes 7 to give the reinforced corrugated top plate 4 a continuous, uniform and controllable downward pulling force, so that the arch of the reinforced corrugated top plate 4 is equal to or lower than the plane where the lower end surface of the original bridge plate is located, and the prestressed installation of the bridge plate and the placement of the pressure-resistant blocks can be further completed.

[0061] In this embodiment, the reinforced corrugated top plate is composed of multiple corrugated steel plates connected in sequence. The wall thickness range of the corrugated steel plates is 2.5mm-12mm, and the wave pitch*wave height selection includes 380mm*140mm, 150mm*50mm, 200mm*55mm, 230mm*64mm, 300mm*110mm or 400mm*150mm. The steel plate material includes Q345, Q235 or Q355.

[0062] The present embodiment provides a simply supported bridge reinforcement method based on reaction frame traction, comprising the following steps:

[0063] Step 1: Use a crane or jack to move the bridge deck of the original simply supported beam bridge away from the abutment;

[0064] Step 2: A reinforced corrugated roof is fixedly installed between the abutments on both sides. Specifically, both ends of the reinforced corrugated roof are bent vertically downward to form connecting ends, which are fixed between the abutment side walls on both sides by chemical anchor bolts. A pressure-resistant block is set at the center of the upper end of the reinforced corrugated roof. The reinforced corrugated roof is bent into a bow-shaped structure. After being fixed, the arch of the reinforced corrugated roof is higher than the plane where the lower end surface of the original bridge plate is located.

[0065] Step 3: Arrange a reaction frame traction device on the ground directly below the reinforced corrugated roof;

[0066] Step 4: Connect steel wire ropes to the two rows of six connecting rings in the middle of the lower end of the reinforced top plate. The other ends of the steel wire ropes are passed through the fixed pulley and the traction rope through hole in sequence, and finally fixedly connected to the dynamic crossbeam.

[0067] Step 5: Start the jack. The jack's push rod pushes the dynamic beam to slide along the slide rail away from the static beam. The dynamic beams of the two sets of reaction push rods pull the six traction ropes to apply a continuous and uniform downward force to the reinforced top plate, causing the arch of the reinforced corrugated top plate to slowly deform downward for a distance. Finally, the arch is equal to or lower than the plane of the lower end surface of the original bridge plate.

[0068] Step 6: Install pressure blocks on the upper end of the reinforced corrugated roof, level the bridge plate, and slowly return the bridge plate to the abutment caps on both sides using a crane or jack. At this time, the lower end surface of the bridge plate is not in contact with or slightly in contact with the pressure blocks.

[0069] Step 7: Start the jack, the jack's push rod retracts, the dynamic beam slides toward the static beam, multiple traction ropes release tension, the reinforced top plate rebounds and arches upward, and the pressure-resistant blocks provide an upward support force to the original bridge plate.

[0070] Before step 3, according to the specific situation of the bridge bearing, you can dig the bearing pedestal stone base groove and grind it flat, place the bearing pedestal stone, and then place the rubber bridge bearing.

[0071] This method proposes a simply supported bridge reinforcement structure pulled by a reaction frame. Six traction ropes are used to apply continuous, stable and uniform downward pulling force to the reinforced corrugated top plate, providing elastic potential energy to the bow-shaped reinforced corrugated top plate. This elastic potential energy provides a prestressed reinforcement environment with upward stable support for the bridge plate to be reinforced. The reaction frame traction device greatly improves the work efficiency and construction quality of the reinforcement construction, improves the bearing capacity of old bridges, and improves the bending and shear resistance of bridges.

[0072] Example 2:

[0073] Different from Example 1, this embodiment provides a simply supported bridge reinforcement structure based on reaction frame traction and a reinforcement method thereof. Before reinforcing the bridge deck, the side walls of the two abutments are first reinforced.

[0074] The reinforcement structure of the abutment side wall includes two sets of reinforced corrugated vertical plates and reinforced corrugated top plates. The two sets of reinforced corrugated vertical plates are anchored on the side walls of the abutments on both sides respectively. A grouting space is left between the reinforced corrugated vertical plates and the abutment side walls. Grouting holes are provided on the reinforced corrugated vertical plates. Concrete mortar is poured in the grouting space to reinforce the abutment side walls.

[0075] The reinforcement method of a simply supported bridge based on reaction frame traction in this embodiment includes the following steps:

[0076] Step 1: First, reinforce the two abutment side walls by anchoring the reinforced corrugated vertical plates to the abutment side walls with gaps, then pour grouting into the grouting space formed by the reinforced corrugated vertical plates and the abutment side walls, and connect the corrugated angle steel to the upper end of the reinforced corrugated vertical plates through bolts; in other embodiments, the reinforced corrugated vertical plates can also be anchored close to the abutment side walls.

[0077] Step 2: After the cast material solidifies, the bridge slab of the original simply supported beam bridge is removed from the abutment by a crane or jack;

[0078] Step 3: A reinforced corrugated roof is fixedly installed between the abutments on both sides. Specifically, both ends of the reinforced corrugated roof are bent vertically downward to form connecting ends, which are fixed between the abutment side walls on both sides by chemical anchors; a pressure-resistant block is set at the center of the upper end of the reinforced corrugated roof, and the reinforced corrugated roof is bent into a bow-shaped structure. After being fixed, the arch of the reinforced corrugated roof is higher than the plane where the lower end surface of the original bridge plate is located;

[0079] Step 4: Arrange a reaction frame traction device on the ground directly below the reinforced corrugated roof;

[0080] Step 5: Connect steel wire ropes to the two rows of six connecting rings in the middle of the lower end of the reinforced top plate. The other ends of the steel wire ropes are passed through the fixed pulley and the traction rope through hole in sequence, and finally fixedly connected to the dynamic crossbeam.

[0081] Step 6: Start the jack. The jack's push rod pushes the dynamic beam to slide along the slide rail away from the static beam. The dynamic beams of the two sets of reaction push rods pull the six traction ropes to apply a continuous and uniform downward force to the reinforced top plate, causing the arch of the reinforced corrugated top plate to slowly deform downward for a distance. Finally, the arch is equal to or lower than the plane of the lower end surface of the original bridge plate.

[0082] Step 7: Place pressure blocks on the upper end of the reinforced corrugated roof, level the bridge slab, and slowly place the bridge slab back onto the abutment caps on both sides using a crane or jack. At this point, the lower end surface of the bridge slab is not in contact with or is in slight contact with the pressure blocks.

[0083] Step 8. Start the jack, the jack's push rod retracts, the dynamic beam slides toward the static beam, multiple traction ropes release tension, the reinforced top plate rebounds and arches upward, and the pressure-resistant blocks provide an upward support force to the original bridge plate.

[0084] Before step 4, according to the specific situation of the bridge bearing, you can dig the bearing pedestal stone base groove and grind it flat, place the bearing pedestal stone, and then place the rubber bridge bearing.

[0085] In this embodiment, the abutments on both sides are reinforced by reinforced corrugated vertical plates and concrete mortar, and the bridge slabs are reinforced and loaded by reinforced corrugated top plates, which reduces the load burden of the old simply supported beam bridge in all directions and improves the bridge reinforcement effect.

[0086] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A simply supported bridge reinforcement structure based on reaction frame traction, wherein a bridge plate is erected between the abutments of the two abutments of the original simply supported beam bridge structure, characterized in that: The reinforcement structure includes a reinforcement top plate and a reaction frame traction device; The reinforced top plate is fixedly arranged between the abutments on both sides. The reinforced top plate is bent upward into a bow-shaped structure to provide an upward supporting force for the bridge plate. A plurality of connecting rings are provided on the lower end surface of the reinforced top plate, and the connecting rings are connected to the reaction frame traction device through traction ropes; The reaction frame traction device is arranged on the ground, including a counterweight frame and at least one set of reaction force push rod parts arranged in the counterweight frame, and the reaction force push rod parts include a pulley shaft group, a static crossbeam, a push mechanism and a dynamic crossbeam; The static crossbeam is fixed in the counterweight frame, and is provided with at least one set of traction rope through holes; The pulley shaft assembly includes a pulley shaft and at least one set of fixed pulleys arranged on the pulley shaft, and the pulley shaft is arranged in a counterweight frame on one side of the static beam; The pushing mechanism is connected to the static crossbeam, and the other end thereof is connected to the dynamic crossbeam, and the static crossbeam is parallel to the dynamic crossbeam; The dynamic crossbeam is movably arranged in the counterweight frame, and the dynamic crossbeam can slide along the counterweight frame under the drive of the pushing mechanism; One end of the traction rope is connected to the connecting ring, and the other end passes through the fixed pulley and the traction rope through hole in sequence and is fixedly connected to the dynamic crossbeam.

2. The simply supported bridge reinforcement structure based on reaction frame traction according to claim 1 is characterized in that: The counterweight frame includes two sets of longitudinal beams arranged in parallel. Both sets of longitudinal beams are provided with slide rails. The dynamic crossbeam can slide along the slide rails. The two ends of the longitudinal beams are fixedly connected to the counterweight blocks.

3. The simply supported bridge reinforcement structure based on reaction frame traction according to claim 2 is characterized in that: The reaction force push rod parts are provided in two groups, and the two groups of reaction force push rod parts are symmetrically arranged in the counterweight frame.

4. The simply supported bridge reinforcement structure based on reaction frame traction according to claim 2 is characterized in that: The reaction force push rod parts are provided in two groups, and the two groups of reaction force push rod parts are sequentially arranged in the counterweight frame.

5. The simply supported bridge reinforcement structure based on reaction frame traction according to claim 3 or 4 is characterized in that: The pulley shaft is arranged between two groups of longitudinal beams, three groups of fixed pulleys are arranged on each pulley shaft, and each reaction force push rod part is connected to three traction ropes.

6. The simply supported bridge reinforcement structure based on reaction frame traction according to claim 5 is characterized in that: The pushing mechanism is a jack, and each reaction force push rod part is provided with two groups of jacks.

7. The simply supported bridge reinforcement structure based on reaction frame traction according to claim 6 is characterized in that: The reinforced top plate is a reinforced corrugated top plate.

8. The simply supported bridge reinforcement structure based on reaction frame traction according to claim 7 is characterized in that: A pressure-resistant block is arranged between the reinforced corrugated top plate and the bridge plate. The pressure-resistant block is a rectangular structure as a whole, and its upper end face is horizontal, which fits tightly with the lower end face of the bridge plate. Its lower end face is an arc surface with a corrugated structure, which fits tightly with the upper end face of the reinforced corrugated top plate. The pressure-resistant block is made of rubber pressure-resistant block or concrete pressure-resistant block. The height of the support replacement space formed by the reinforced corrugated top plate and the two ends of the bridge plate is not less than 0.5m.

9. The reinforcement method of a simply supported bridge structure based on reaction frame traction according to claim 1, characterized in that: The method includes the following steps: Use a crane or jack to remove the bridge deck of the original simply supported beam bridge from the abutment; A reinforced top plate is fixedly installed between the abutments on both sides. The reinforced top plate is curved into an arched structure, and the arch top of the reinforced top plate is higher than the plane where the lower end surface of the original bridge plate is located; Arrange a reaction frame traction device on the ground directly below the reinforced top plate; The traction ropes are connected to the multiple groups of connection rings at the lower end of the reinforced top plate respectively, and the other ends of the traction ropes are passed through the fixed pulleys and the traction rope through holes in sequence and then fixedly connected to the dynamic crossbeam; The pushing mechanism is activated, and the pushing mechanism pushes the dynamic crossbeam to slide away from the static crossbeam. The dynamic crossbeam pulls multiple traction ropes to apply a continuous and uniform downward pulling force to the reinforced top plate, so that the arch of the reinforced top plate is equal to or lower than the plane of the lower end surface of the original bridge plate; Install pressure-resistant blocks on the upper end of the reinforced corrugated roof and then re-install the original bridge slab; The pushing mechanism is activated, and the pushing mechanism retracts the dynamic beam and slides it toward the static beam. Multiple traction ropes release the tension, and the reinforced top plate rebounds and arches upward, providing an upward supporting force to the original bridge plate.

10. The simply supported bridge reinforcement method based on reaction frame traction according to claim 9 is characterized in that: It also includes reinforcing the two abutment side walls. The method of reinforcing the two abutment side walls includes anchoring the reinforcing vertical plates at intervals on the abutment side walls and then grouting in the formed filling cavity or anchoring the reinforcing vertical plates tightly against the abutment side walls.

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