CN115045205A - Reinforcement structure and reinforcement method of simply supported bridge based on traction of reaction frame - Google Patents

Abstract

The invention relates to a simply supported bridge reinforcement structure based on the traction of a reaction force frame and a reinforcement method thereof. A bridge plate is erected between the abutments of the two bridge abutments of the original simply supported girder bridge structure, and the reinforcement structure comprises a reinforcement top plate and a reverse Force frame traction device, the reaction force frame traction device is arranged on the ground, and includes a counterweight frame and at least one set of counterforce push rod parts arranged in the counterweight frame, and the reaction force push rod part includes a pulley shaft group, a static beam, a push rod Mechanism and dynamic beam; the reinforced structure converts the horizontal traction of multiple groups of wire ropes into a continuous, stable and uniform downward force on the reinforced roof through the reaction frame, provides elastic potential energy for the bow-shaped reinforced corrugated roof, and provides a simple-supported bridge. Stable and safe reinforcement construction environment, thus realizing the reinforcement and loading of old bridges and dangerous bridges, and solving the problems of bridge slab subsidence and central cracking of old simply supported bridges.

Description

Reinforcement structure and reinforcement method of simply supported bridge based on traction of reaction frame

technical field

The invention relates to the technical field of girder bridge loading reinforcement, in particular to a simply supported bridge reinforcement structure based on reaction frame traction and a reinforcement method thereof.

Background technique

A simply supported girder bridge is a girder bridge whose main load-bearing structure is a beam supported at both ends on a pier and abutment, and belongs to a statically determinate structure. It is the earliest and most widely used bridge shape in beam bridges. It is suitable for various geological conditions, the structure is relatively simple, it is easy to be made into standardized and assembled components, and it is more convenient to manufacture and install. It is the most widely used beam bridge.

Due to the gradual increase of traffic pressure and the continuous improvement of the service life of existing bridges, a large number of simply supported girder bridges on highways and local roads in my country have appeared in a large number of old bridges and dangerous bridges. Poor, cracks, veneer stress, surface defects, serious damage to bridge deck pavement, freeze-thaw damage, bridge head subsidence, wing wall outer bulge, pier erosion and foundation hollowing are the most common diseases, which make the driving comfort level. If the vehicle is lowered, the direct damage of the vehicle to the bridge structure is more serious, and in severe cases, it will directly cause serious accidents such as loss of control of the vehicle and bridge collapse.

Therefore, the maintenance and reinforcement of simply supported girder bridges has gradually become a hot topic, and the number of bridges that need reinforcement and improvement of bearing capacity is increasing. , it does not help the beam body to resist its own weight and increase the bearing capacity; it is urgent to propose a reinforcement structure for simply supported girder bridges, which is convenient and reliable for the reinforcement of existing bridges.

SUMMARY OF THE INVENTION

The invention provides a simply supported bridge reinforcement structure based on reaction frame traction and a reinforcement method thereof, and solves the problems of difficult construction, low construction efficiency and poor reinforcement effect of reinforcement engineering of simply supported girder bridges in the prior art.

In order to achieve the above object, technical scheme of the present invention is as follows:

The simply supported bridge reinforcement structure based on the traction of the reaction frame, a bridge plate is erected between the abutment caps of the two abutments of the original simply supported girder bridge structure, and the reinforcement structure includes a reinforcement roof and a reaction frame traction device;

The reinforced roof is fixed spanned between the abutments on both sides or between the side walls of the abutment, the reinforced roof is bent into a bow-shaped structure, and the reinforced roof gives the bridge plate an upward supporting force;

A plurality of groups of connecting rings are arranged on the lower end face of the reinforced top plate, and the connecting rings are connected to the traction device of the reaction frame through the traction rope;

The reaction force frame traction device is arranged on the ground, and includes 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 part includes a pulley shaft group, a static beam, a pushing mechanism and a dynamic push rod part. beam;

The static beam is fixed in the counterweight frame, and at least one group of traction rope through holes are opened on the static beam;

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

The ejecting mechanism is connected with the static beam, the other end is connected with the dynamic beam, and the static beam is parallel to the dynamic beam;

The dynamic beam is movably arranged in the counterweight frame, and the dynamic beam can slide along the counterweight frame under the driving of the ejecting mechanism;

One end of the traction rope is connected to the connecting ring, and the other end is fixedly connected to the dynamic beam after passing through the fixed pulley and the through hole of the traction rope in sequence.

Further, the counterweight frame includes two sets of longitudinal beams arranged in parallel, both sets of longitudinal beams are provided with sliding rails, the dynamic transverse beams can slide along the sliding rails, and the two ends of the longitudinal beams are fixedly connected to the counterweight blocks.

Further, two sets of reaction force push rods are arranged, and the two sets of reaction force push rods are symmetrically arranged in the counterweight frame.

Further, two groups of reaction force push rods are arranged, and the two groups of reaction force push rods are sequentially arranged in the counterweight frame.

Further, the pulley shaft is arranged between the two sets of longitudinal beams, three sets of fixed pulleys are arranged on each pulley shaft, and each reaction force push rod is connected with three traction ropes.

Further, the pushing mechanism is a jack, and each reaction force push rod part is provided with two sets of jacks.

Further, the reinforced roof is a reinforced corrugated roof.

Further, a pressure-resistant block is arranged between the reinforced corrugated top plate and the bridge plate. The pressure-resistant block has a rectangular structure as a whole, its upper end surface is horizontal, and is closely attached to the lower end surface of the bridge plate, and its lower end surface has a corrugated structure. The arc surface of the reinforced corrugated roof is closely attached to the upper end surface of the reinforced corrugated roof; the compression blocks are selected from fast-setting compression blocks, rubber compression blocks or concrete compression blocks. The height of the replacement space is not less than 0.5m.

The simply supported bridge reinforcement method based on reaction frame traction includes the following steps;

Make the bridge slab of the original simply supported girder bridge leave the abutment by crane or jack;

A reinforced roof is fixed and spanned between the bridge abutments on both sides, and the reinforced roof is bent into a bow-shaped structure.

The reaction frame traction device is arranged on the ground just below the reinforced roof;

The traction ropes are respectively connected to the multiple sets of connecting rings at the lower end of the reinforced top plate, and the other end of the traction rope passes through the fixed pulley and the traction rope through hole in turn and is fixedly connected with the dynamic beam;

The ejector mechanism is activated, and the ejector mechanism pushes the dynamic beam to slide away from the static beam, and the dynamic beam pulls multiple traction ropes to continuously and uniformly pull the reinforced roof downward, so that the vault of the reinforced roof is equal to or lower than the original bridge slab. The plane where the lower end face is located;

Set the pressure block at the top of the reinforced corrugated roof and put it back to the original bridge slab;

Activate the jacking mechanism, the jacking mechanism recovers the dynamic beam and slides in the direction close to the static beam, multiple traction ropes release the pulling force, strengthen the top plate to rebound and arch upward, giving the original bridge plate an upward supporting force.

Further, it also includes reinforcing the two abutment sidewalls, and the method for reinforcing the two abutment sidewalls includes anchoring against the abutment sidewalls by reinforced vertical plates or anchoring on the bridge abutment sidewalls through the reinforcing vertical plates at intervals. Then grouting is poured in the formed filled cavity.

Compared with the prior art, the beneficial effects of the present invention are as follows:

1. One embodiment of the present invention converts the horizontal traction of multiple groups of wire ropes into a downward pulling force on the reinforced corrugated roof through a reaction force frame. Stable and safe reinforcement construction environment, so as to realize the reinforcement and loading of old bridges and dangerous bridges, and solve problems such as subsidence and central cracking of bridge slabs.

2. In one embodiment of the present invention, the girder bridge reinforcement structure transmits the support force of a large area of flexibility to the bridge plate through the compression block, which reduces the deformation problem caused by the point force of the corrugated roof plate and the bridge plate, and prevents the beam The development of cracks in the bridge under overload extends the service life of the reinforced structure.

3. In one embodiment of the present invention, an integral reinforcement structure is provided to reinforce the corrugated top plate and the corrugated vertical plate, and the reinforcement of the bridge abutments on both sides is completed by reinforcing the corrugated vertical plate and the concrete mortar, and the reinforcement of the bridge plate is completed by strengthening the corrugated roof plate. Lifting the load, reducing the load burden of the old simply supported girder bridge in an all-round way, and improving the bridge reinforcement effect.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, the drawings of other embodiments can also be obtained according to these drawings without creative efforts.

1 is a schematic diagram of the overall structure of an embodiment of the present invention;

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

Fig. 3 is the top view of Fig. 2;

4 is a schematic structural diagram of a pressure-resistant block according to an embodiment of the present invention;

In the figure, 1- abutment, 2- cap, 3- bridge plate, 4- reinforced corrugated roof, 5- pressure block;

6-Reaction frame traction device, 601-Pulley shaft group, 602-Static beam, 603-Dynamic beam, 604-Longitudinal beam, 605-Counterweight block, 606-Jack;

7-Wire rope.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the related drawings. The preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

In the description of this patent, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present patent and simplifying the description, rather than indicating or implying The device or element referred to must have, be constructed, and operate in a particular orientation and is not to be construed as a limitation of this patent.

In the description of this patent, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected" and "arranged" should be understood in a broad sense. , it can also be detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in this patent can be understood according to specific situations.

The patent applied by the applicant earlier, patent number: 202111506021.7, relates to a corrugated steel arch reinforcement structure of a simply supported girder bridge and a reinforcement method thereof. The load is hoisted by a traction rope to realize the pull-down of the reinforced roof. This method is prone to downward movement. The traction force is uneven, the traction force cannot be controlled, and even the traction is unstable, resulting in deformation and bending of the reinforced roof.

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 the traction of the reaction force frame, and the horizontal traction is transformed into the continuous, stable and stable downward movement of the reinforced corrugated roof through the reaction force frame. Uniform tension provides a convenient and safe reinforcement construction environment for simply supported bridges, so as to realize the reinforcement and loading of old bridges and dangerous bridges, and solve problems such as subsidence of bridge slabs and central cracking.

Example 1:

Referring to the simply supported bridge reinforcement structure based on the traction of the reaction frame described in FIG. 1, a bridge plate 3 is erected between the abutment caps 2 of the two abutments 1 of the original simply supported girder bridge structure, and the reinforcement structure includes a reinforcement top plate and a reverse structure. Force frame traction device 6;

The reinforced roof is fixed spanned between the bridge abutments 1 on both sides or between the side walls of the abutment, and the reinforced roof is bent into a bow-shaped structure. Block 5, the structure of the pressure-resistant block 5 is shown in FIG. 4, which is pressed down by the bridge plate 3 and deformed, and gives the bridge plate 3 an upward supporting force through the pressure-resistant block 5; in other embodiments, the reinforced top plate can also be Flat steel plate or hollow steel plate.

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

In this embodiment, six groups of connecting rings are arranged on the central lower end surface of the reinforced corrugated top plate 4, and the six groups of connecting rings are welded in two rows to 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 the embodiment, the wire rope 7 is selected as the traction rope.

2 and 3, the reaction force frame traction device 6 is arranged on the ground, including a counterweight frame and two groups of reaction force push rods arranged in the counterweight frame, and the two groups of reaction force push rods have the same structure and are arranged in sequence In the counterweight frame, the push rod portion of the reaction force includes a pulley shaft group 601 , a static beam 602 , an ejection mechanism and a dynamic beam 603 .

The counterweight frame includes two sets of longitudinal beams 604 arranged in parallel, and slide rails are provided on opposite sides of the two sets of longitudinal beams 604. Both ends of the longitudinal beams 604 are fixedly connected to counterweight blocks 605. In this embodiment, the counterweight blocks 605 is a cement pier, and two sets of parallel longitudinal beams 604 pass through several cement piers at both ends of them. In other embodiments, the counterweight can also be an object with a certain weight such as a steel ingot or a water horse.

The static beams 602 are welded or bolted to two sets of parallel longitudinal beams 604 . The static beams 602 are steel beams. Three sets of traction rope through holes for passing the traction ropes are formed on the beams of the static beams 602 .

The dynamic beams 603 are arranged in the slide rails of the two groups of longitudinal beams 604 arranged in parallel, the dynamic beams 603 can slide in the two groups of longitudinal beams 604 arranged in parallel, and the static beams 602 are arranged in parallel with the dynamic beams 603 .

In this embodiment, jacks 606 are selected for the ejecting mechanism, and two sets of jacks 606 are arranged on each reaction push rod portion, and two sets of jacks 606 are arranged between the static beam 602 and the dynamic beam 603, and are arranged on both sides; the jacks 606 The base is fixedly connected to one side of the static beam 602, and the head of the jack 606 is fixedly connected to the dynamic beam 603. When the jack 606 is jacked in or retracted, the dynamic beam 603 can be driven to move away from or approach the static beam 602.

In this embodiment, the pulley shaft group 601 includes a pulley shaft and three sets of fixed pulleys fixed on the pulley shaft.

One end of each wire rope 7 is connected to the connecting ring of the reinforced corrugated top plate 4 , and the other end of the wire rope 7 bypasses the fixed pulley and the through hole of the traction rope in turn, and is finally fixedly connected to the dynamic beam 603 . When the six sets of jacks 606 of the two sets of reaction force push rods are activated, the jacks 606 push the dynamic beam 603 to slide along the slide rail in a direction away from the static beam 602. The sliding distance and sliding speed of the dynamic beam 603 can be determined by The stroke of the jack 606 is precisely controlled, and then the three steel wire ropes 7 are pulled to give the reinforced corrugated roof 4 a continuous and uniform downward pulling force, so that the dome of the reinforced corrugated roof 4 is equal to or lower than the plane where the lower end surface of the original bridge plate is located, that is, The prestressed installation of bridge slabs and the placement of pressure blocks can be further completed.

In this embodiment, the reinforced corrugated top plate is formed by connecting multiple corrugated steel plates in sequence, the wall thickness of the corrugated steel plates is 2.5mm-12mm, and the selection of wave distance*wave height includes 380mm*140mm, 150mm*50mm, 200mm*55mm, 230mm* 64mm, 300mm*110mm or 400mm*150mm, the steel plate material includes Q345, Q235 or Q355.

The method for reinforcing a simply supported bridge based on the traction of the reaction frame in this embodiment includes the following steps;

Step 1. Use a crane or a jack to make the bridge slab of the original simply supported girder bridge leave the abutment;

Step 2. A reinforced corrugated roof is fixed and spanned between the abutments on both sides. Specifically, the two ends of the reinforced corrugated roof are vertically bent downward to form a connecting end, and the connecting end is fixed on the abutment sides on both sides by chemical anchor bolts. Between the walls; a pressure block is arranged at the center of the upper end of the solid corrugated roof, and the reinforced corrugated roof is bent into an arcuate structure.

Step 3. Arrange the reaction frame traction device on the ground directly below the reinforced corrugated roof;

Step 4. Connect the steel wire ropes to the two rows and a total of six sets of connecting rings in the middle of the lower end of the reinforced top plate respectively, and the other end of the steel wire rope bypasses the fixed pulley and the through hole of the traction rope in turn, and finally is fixedly connected to the dynamic beam;

Step 5. Start the jack, the push rod of the jack pushes the dynamic beam to slide along the slide rail to the direction away from the static beam, and the dynamic beams of the two sets of reaction push rods pull six traction ropes to give the reinforced roof a continuous and uniform downward force. , so that the vault of the reinforced corrugated roof is slowly deformed downward for a certain distance, and the final vault is equal to or lower than the plane where the lower end face of the original bridge slab is located;

Step 6. Set the pressure block on the top of the reinforced corrugated roof, level the bridge plate, and slowly put the bridge plate back to the abutment caps of the bridge abutments on both sides by crane or jack. At this time, the lower end surface of the bridge plate does not contact the pressure block or slightly. touch;

Step 7. Start the jack, the push rod of the jack retracts, the dynamic beam slides in the direction close to the static beam, multiple traction ropes release the tension, strengthen the top plate to rebound and arch upward, and give the original bridge plate an upward movement through the pressure-resistant block. of support.

Before step 3, according to the specific conditions of the bridge support, the base groove of the support cushion stone can be ground and smoothed, the support cushion stone can be placed, and then the rubber bridge support can be placed.

This method proposes a simply supported bridge reinforcement structure pulled by a reaction frame, and provides elastic potential energy for the bow-shaped reinforcement corrugated roof to provide elastic potential energy to the reinforced corrugated roof through six traction ropes. The plate provides a prestressed reinforcement environment with upward and stable support, and the traction device of the reaction frame greatly improves the work efficiency and construction quality of the reinforcement construction, improves the bearing capacity of the old bridge, and improves the flexural and shear resistance of the bridge.

Example 2:

Different from Embodiment 1, this embodiment provides a simply supported bridge reinforcement structure based on reaction frame traction and a reinforcement method thereof. Before reinforcement of the bridge slab, reinforcement work is first performed on the side walls of the two abutments.

The reinforcement structure of the side walls of the abutment includes two sets of reinforced corrugated vertical plates and a reinforced corrugated roof. In the grouting space, grouting holes are arranged on the reinforced corrugated vertical plate, and concrete mortar is poured in the grouting space to reinforce the side wall of the abutment.

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

Step 1. First, reinforce the two side walls of the abutment, anchor the side walls of the abutment by reinforcing the corrugated vertical plates with gaps, and then grouting in the grouting space formed by the corrugated vertical plates and the side walls of the abutment. The upper end of the reinforced corrugated vertical plate is connected with the corrugated angle steel by bolts; in other embodiments, the reinforced corrugated vertical plate can also be anchored against the side wall of the abutment.

Step 2. After the material to be poured is solidified, the bridge slab of the original simply supported girder bridge can be separated from the abutment by a crane or a jack;

Step 3. A reinforced corrugated roof is fixed and spanned between the abutments on both sides. Specifically, the two ends of the reinforced corrugated roof are vertically bent downward to form a connecting end, and the connecting end is fixed on the abutment sides on both sides by chemical anchor bolts. Between the walls; a pressure block is arranged at the center of the upper end of the solid corrugated roof, and the reinforced corrugated roof is bent into an arcuate structure.

Step 4. Arrange the reaction frame traction device on the ground directly below the reinforced corrugated roof;

Step 5. Connect the steel wire ropes to the two rows of six sets of connecting rings in the middle of the lower end of the reinforced roof respectively, and the other end of the steel wire rope goes around the fixed pulley and the through hole of the traction rope in turn, and finally is fixedly connected with the dynamic beam;

Step 6. Start the jack, the push rod of the jack pushes the dynamic beam to slide along the slide rail to the direction away from the static beam, and the dynamic beams of the two sets of reaction push rods pull six traction ropes to give the reinforced roof a continuous and uniform downward force. , so that the vault of the reinforced corrugated roof is slowly deformed downward for a certain distance, and the final vault is equal to or lower than the plane where the lower end face of the original bridge slab is located;

Step 7. Set a pressure block on the top of the reinforced corrugated roof, level the bridge plate, and slowly put the bridge plate back to the abutment caps of the bridge abutments on both sides by a crane or a jack. At this time, the lower end surface of the bridge plate is not in contact with the pressure block or slightly touch;

Step 8. Start the jack, the push rod of the jack retracts, the dynamic beam slides in the direction close to the static beam, multiple traction ropes release the tension, strengthen the top plate to rebound and arch upward, and give the original bridge plate an upward movement through the pressure-resistant block. of support.

Before step 4, according to the specific conditions of the bridge support, the base groove of the support cushion stone can be ground and smoothed, and the support cushion stone is placed, and then the rubber bridge support is placed.

In this embodiment, the reinforcement of the bridge abutments on both sides is completed by reinforcing the corrugated vertical plate and the concrete mortar, and the reinforcement and loading of the bridge plate is completed by reinforcing the corrugated roof, which reduces the load burden of the old simply supported girder bridge in an all-round way and improves the performance of the bridge. Bridge reinforcement effect.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1. based on the simply supported bridge reinforcement structure drawn by the reaction frame, a bridge plate is set up between the abutments of the two bridge abutments of the original simply supported girder bridge structure, it is characterized in that, described reinforcement structure comprises reinforcement top plate and reaction force rack traction device; The reinforced roof is fixed spanned between the abutments on both sides or between the side walls of the abutment, the reinforced roof is bent into a bow-shaped structure, and the reinforced roof gives the bridge plate an upward supporting force; A plurality of sets of connecting rings are arranged on the lower end face of the reinforced top plate, and the connecting rings are connected to the traction device of the reaction frame through the traction rope; The reaction force frame traction device is arranged on the ground, and includes 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 part includes a pulley shaft group, a static beam, a pushing mechanism and a dynamic push rod part. beam; The static beam is fixed in the counterweight frame, and at least one group of traction rope through holes are opened on the static beam; The pulley shaft group includes a pulley shaft and at least one set of fixed pulleys arranged on the pulley shaft, and the pulley shaft is arranged in the counterweight frame on one side of the static beam; The ejecting mechanism is connected with the static beam, the other end is connected with the dynamic beam, and the static beam is parallel to the dynamic beam; The dynamic beam is movably arranged in the counterweight frame, and the dynamic beam can slide along the counterweight frame under the driving of the ejecting mechanism; One end of the traction rope is connected to the connecting ring, and the other end is fixedly connected to the dynamic beam after passing through the fixed pulley and the through hole of the traction rope in sequence. 2. The simply supported bridge reinforcement structure based on the traction of the reaction frame according to claim 1 is characterized in that, the counterweight frame comprises two groups of longitudinal beams arranged in parallel, and the two groups of longitudinal beams are both provided with sliding rails, and the dynamic beams can be Sliding along the slide rail, the two ends of the longitudinal beam are fixedly connected to the counterweight. 3 . The simply supported bridge reinforcement structure based on the traction of the reaction force frame according to claim 2 , wherein two groups of the reaction force push rod parts are arranged, and the two groups of reaction force push rod parts are symmetrically arranged in the counterweight frame. 4 . 4 . The simply supported bridge reinforcement structure based on reaction force frame traction according to claim 2 , wherein two groups of reaction force push rod parts are arranged, and the two groups of reaction force push rod parts are sequentially arranged in the counterweight frame. 5 . 5. The simply supported bridge reinforcement structure based on reaction frame traction according to claim 3 or 4, wherein the pulley shaft is arranged between two groups of longitudinal beams, and three groups of fixed pulleys are arranged on each pulley shaft, Each reaction push rod part is connected with three traction ropes. 6 . The simply supported bridge reinforcement structure based on the traction of the reaction force frame according to claim 5 , wherein the pushing mechanism is a jack, and each reaction force push rod part is provided with two sets of jacks. 7 . 7 . The simply supported bridge reinforcement structure based on reaction frame traction according to claim 6 , wherein the reinforced roof is a reinforced corrugated roof. 8 . 8 . The simply supported bridge reinforcement structure based on the traction of the reaction frame according to claim 7 , wherein a compression block is arranged between the reinforcement corrugated top plate and the bridge plate, and the compression block is a rectangular structure as a whole. 9 . The upper end surface is horizontal and closely fits with the lower end surface of the bridge plate. The lower end surface is an arc surface with a corrugated structure, which is closely attached to the upper end surface of the reinforced corrugated roof; Or concrete pressure-resistant blocks, the height of the bearing 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 simply supported bridge reinforcement method based on reaction frame traction, is characterized in that, comprises the following steps; Make the bridge slab of the original simply supported girder bridge leave the abutment by crane or jack; A reinforced roof is fixed and spanned between the bridge abutments on both sides, and the reinforced roof is bent into a bow-shaped structure. The reaction frame traction device is arranged on the ground just below the reinforced roof; The traction ropes are respectively connected to the multiple sets of connecting rings at the lower end of the reinforced top plate, and the other end of the traction rope passes through the fixed pulley and the traction rope through hole in turn and is fixedly connected to the dynamic beam; The ejector mechanism is activated, and the ejector mechanism pushes the dynamic beam to slide away from the static beam, and the dynamic beam pulls multiple traction ropes to continuously and uniformly pull the reinforced roof downward, so that the vault of the reinforced roof is equal to or lower than the original bridge slab. The plane where the lower end face is located; Set the pressure block at the top of the reinforced corrugated roof and put it back to the original bridge slab; Activate the jacking mechanism, the jacking mechanism recovers the dynamic beam and slides in the direction close to the static beam, multiple traction ropes release the pulling force, strengthen the top plate to rebound and arch upward, giving the original bridge plate an upward supporting force. 10. The method for reinforcing a simply supported bridge based on the traction of the reaction frame according to claim 9, wherein the method further comprises reinforcing two abutment side walls, and the method for reinforcing the two abutment side walls comprises reinforcing the two abutment side walls. The vertical plate is anchored against the side wall of the abutment or is anchored to the side wall of the abutment by reinforcing the vertical plate at intervals and then grouted in the formed filling cavity.

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