CN111622134A - Continuous beam bridge roof concrete crack reinforcing structure and repairing method thereof - Google Patents

Abstract

The invention provides a reinforcing structure for top plate crack of a continuous beam bridge, which is applied to a top plate crack area and comprises a plurality of groups of first stiffening frameworks arranged on equal-thickness sections of the top plate and a plurality of groups of second stiffening frameworks arranged on variable-thickness sections of the top plate, wherein the plurality of groups of first stiffening frameworks and the plurality of groups of second stiffening frameworks are arranged at intervals along the bridge direction, each group of first stiffening frameworks comprises a plurality of through bolts arranged at intervals along the bridge direction, the through bolts penetrate through the top plate and are fixedly connected with the top plate, each group of second stiffening frameworks comprises a plurality of anchoring bolts arranged at intervals along the bridge direction, and the top ends of the anchoring bolts are inserted into the top plate and are fixedly connected with the top plate. According to the invention, the stiffening framework is arranged in the top plate crack area, so that the prestress loss caused by concrete crack is effectively reduced, the integral structure meets the design stress requirement, and the crack part is filled with the grouting layer, so that the later repaired area and the original structure are effectively combined into a whole.

Description

Continuous beam bridge roof concrete crack reinforcing structure and repairing method thereof

Technical Field

The invention relates to the technical field of highway bridges, in particular to a reinforcing structure for top plate crack of a continuous beam bridge and a repairing method thereof.

Background

With the wide application of continuous beam bridges in various places of China, disease reports related to the bridges appearing in the construction stage also occur occasionally. The reason is mainly that the prestressed steel bundles between the upper and lower steel bars are not completely arranged according to requirements in the construction process, and the positioning part of the prestressed steel bundles has deviation and the like.

The method has the advantages that the cracked area of the concrete of the continuous beam bridge is repaired, no good repairing method is available all the time, and the local repair of mortar is usually adopted. This method has the following disadvantages: 1. after the concrete cracks, the prestressed steel beams are locally deformed and have prestress loss, and the method does not improve the stress loss; 2. after the local mortar is repaired, the local mortar can be hollowly and shed along with the stress change in the later period.

Disclosure of Invention

The invention aims to provide a reinforcing structure for top plate crack of a continuous beam bridge and a repairing method thereof, and solves the problems that in the prior art, prestressed steel beams are partially deformed and have prestress loss, and local mortar can hollowly drop along with stress change in the later period.

In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a reinforced structure that continuous beam bridge roof board bursts apart, is applied to the roof and bursts apart regionally, including set up in the first stiffening rib of multiunit of roof isophical section with set up in the multiunit second stiffening rib of roof section that becomes thick, the first stiffening rib of multiunit and multiunit second stiffening rib all set up to the interval along following the bridge, every group first stiffening rib includes along a plurality of to wearing the bolt that the cross bridge set up to the interval, wear to wearing the bolt and locate on the roof to rather than fixed connection, every group the second stiffening rib includes along a plurality of anchor bolts that the cross bridge set up to the interval, anchor bolt top portion inserts in the roof to rather than fixed connection.

As a preferred scheme, the first stiffening framework further comprises a channel steel arranged at the bottom end part of the top plate along the transverse bridge direction, a plurality of through holes in one-to-one correspondence are respectively formed in the channel steel and the top plate, the through holes are penetrated by the through bolts, and the upper end part and the lower end part of each through bolt are respectively fixedly connected with the top end part of the top plate and the bottom end part of the channel steel.

As a preferred scheme, the first stiffening framework further comprises a temporary support arranged above the top plate along the transverse bridge direction, a plurality of through holes in one-to-one correspondence are respectively formed in the temporary support and the top plate, the through holes are penetrated by the through bolts, and the upper end portion and the lower end portion of each through bolt are respectively fixedly connected with the top end portion of the temporary support and the bottom end portion of the top plate.

Preferably, the second stiffening frame further comprises a channel steel arranged at the bottom end of the top plate along the transverse bridge direction, and the anchor bolt penetrates through the channel steel and the top end of the anchor bolt is inserted into the top plate.

Preferably, the top plate crack area is provided with an exposed prestressed steel beam, and a steel beam cushion block is arranged between the prestressed steel beam and the channel steel, and the upper end and the lower end of the steel beam cushion block are respectively and fixedly connected with the prestressed steel beam and the channel steel.

Preferably, a leveling cushion block is arranged between the bottom end of the top plate and the channel steel and used for adjusting the channel steel to be in a horizontal state.

Preferably, the steel plates are adhered to the upper surface and the lower surface of the top plate, and a grouting layer is filled between the lower surface of the top plate and the steel plates through glue injection holes formed in the top plate.

The invention also provides a method for repairing the top plate crack of the continuous beam bridge, which comprises the following steps: 1) the site inspection is carried out, the site is investigated and rechecked, the top plate crack range and the relevant size are verified, the position of the prestressed steel beam is detected and used as a drilling basis, and the position of the top plate drilling is avoided from the position of the prestressed steel beam;

2) constructing a side stiffening framework, namely installing a first stiffening framework and a second stiffening framework at the edge position of the top plate crack area to prevent secondary crack caused by disturbance generated in subsequent construction; 3) chiseling concrete, and cleaning the peeled concrete one by one in a segmented and cracked area; 4) constructing a middle stiffening framework, namely arranging first stiffening frameworks at intervals in the middle positions of the crack regions along the trend of the prestressed steel bundles, and fixing the exposed prestressed steel bundles on the stiffening frameworks; 5) the bottom layer steel bar is connected, the exposed bottom layer longitudinal and transverse steel bars are corrected, a binding mode is adopted for connection to form a steel bar mesh, and the steel bar mesh is connected with the stiffening framework; 6) pasting a steel plate, processing the pasting surface of the top plate and the steel plate, and smearing an adhesive on the pasting surface for pasting; 7) drilling a glue injection hole and pouring grouting material, according to the drilling of the glue injection hole on the top plate, pouring the grouting material between the bottom end part of the top plate and the steel plate through the glue injection hole, and after the grouting material is solidified to reach certain strength, pouring structural glue in a gap between the bolt of the stiffening framework and the top plate.

Preferably, the adhering steel plate comprises the following specific steps: carrying out surface treatment on the top plate, polishing the concrete binding surface of the top plate, removing a surface layer with the thickness of 1-2 mm, completely exposing a new surface, removing dust by using compressed air or washing the new surface by using clear water, completely drying, spraying acetone on the binding surface, and roughening the binding surface to make the binding surface rough; the steel plate surface treatment, using sand blasting, abrasive cloth or flat grinding wheel to polish the steel plate binding surface, wherein the polishing lines are vertical to the steel plate stress direction until the metal luster appears, and then using absorbent cotton to be dipped in acetone to clean the steel plate binding surface; drilling a steel plate, namely drilling holes in the steel plate, wherein the steel plate hole positions correspond to the positions of the top plate concrete through holes; installing a steel plate, enabling bolts of the stiffening framework to penetrate through the holes of the steel plate and screwing the bolts; mixing glue, namely weighing the A and B two components of the adhesive in proportion, and pouring the mixture into a container to be uniformly stirred; the steel sheet is pasted, uses the spatula to scribble the adhesive on the binding face of the roof that has handled and steel sheet, makes a round trip to wipe in the faying face several times with a small amount of adhesive earlier, and then add and wipe to 1 ~ 3mm thickness, and the middle thick edge is thin, then pastes the steel sheet in preset position, and after the steel sheet was pasted, the steel sheet was strikeed gently along the binding face with the hammer, if there was not the cavity sound, it had pasted closely knit to show, otherwise should peel off the steel sheet, pastes again.

Compared with the prior art, the invention has the beneficial effects that: by arranging the stiffening framework in the top plate crack area, the prestress loss caused by concrete crack is effectively reduced, so that the integral structure meets the design stress requirement; through pasting the steel sheet from top to bottom at the roof to fill the grout blanket at the position of bursting apart, make the regional and the original structure of back repair effectual combine into a whole, later stage can not the hollowing drop.

Drawings

The disclosure of the present invention is illustrated with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like parts. Wherein:

FIG. 1 is a schematic elevation view of a top plate of a continuous beam bridge according to an embodiment of the present invention;

FIG. 2 is a schematic plan view of a continuous beam bridge deck according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of stiffening frameworks A-1 and A-2 of the reinforcing structure for the burst of the continuous beam bridge according to the embodiment of the invention;

FIG. 4 is a cross-sectional view of stiffening frameworks A-3 to A-5 of the reinforcing structure for the burst of the continuous beam bridge according to the embodiment of the invention;

FIG. 5 is a partially enlarged portion at A in FIG. 4;

FIG. 6 is a cross-sectional view of stiffening frameworks A-6 and A-7 of the reinforcing structure for the burst of the continuous beam bridge according to the embodiment of the invention;

FIG. 7 is an enlarged view of a portion of FIG. 6 at B;

FIG. 8 is a cross-sectional view of stiffening frameworks B-1 and B-2 of the reinforcing structure for the burst of the continuous beam bridge according to the embodiment of the invention;

FIG. 9 is a flowchart of a method for repairing cracks of a continuous beam bridge according to an embodiment of the present invention;

FIG. 10 is a flow chart of attaching a steel plate according to an embodiment of the present invention.

Reference numbers in the figures: the steel beam leveling device comprises a top plate 1, a bottom plate 2, a cross beam 3, a box chamber 4, a grouting layer 5, a pair of through bolts 6, a screw 61, a gasket 62, a nut 63, an anchor bolt 7, a temporary support 8, a channel steel 9, a grouting hole 10, a temporary cushion block 11, a steel beam cushion block 12, a steel plate 13, a prestressed steel beam 14 and a leveling cushion block 15.

Detailed Description

It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.

It should be understood that the continuous beam bridge has a top plate 1, a bottom plate 2 and an end cross beam 3, a box chamber 4 is formed among the top plate 1, the bottom plate 2 and the end cross beam 3, a region prone to crack is located at the bottom end of the top plate 1, one end of the top plate 1, which is far away from the end cross beam 3, is an equal-thickness section, and one end, which is close to the end cross beam 3, is a gradually thickened section.

An embodiment according to the present invention is shown in conjunction with fig. 1 and 2. A reinforcing structure for top plate cracking of a continuous beam bridge is applied to a top plate 1 cracking area and comprises 7 first stiffening frameworks and 7 second stiffening frameworks, wherein the first stiffening frameworks are sequentially arranged at equal-thickness sections of the top plate 1 at intervals along the direction from a section line to a beam end line (along the bridge direction), and the number of the first stiffening frameworks is A-1 to A-7; the number of the second stiffening frameworks is 4, and the second stiffening frameworks are sequentially arranged at the thickening sections of the top plate 1 at intervals along the direction from the beam end line to the segment line (along the bridge direction), and are respectively B-1 to B-4.

As shown in fig. 1 and 3, the first stiffening frameworks a-1 and a-2 are located at the edge of the top plate 1 crack region, and include channel steel 9 arranged at the bottom end of the top plate 1 along the transverse bridge direction, a plurality of one-to-one through holes are formed in the channel steel 9 and the top plate 1, through bolts 6 penetrate through the through holes, and the upper end portion and the lower end portion of each through bolt 6 are fixedly connected with the top end portion of the top plate 1 and the bottom end portion of the channel steel 9 respectively.

As shown in fig. 1 and 4, the first stiffening frameworks a-3, a-4 and a-5 are located in the middle of the spalling area of the roof 1, and comprise temporary supports 8 arranged above the roof 1 along the transverse bridge direction, and temporary blocks 11 are arranged between the temporary supports 8 and the roof 1 for supporting the temporary supports 8. Set up the through-hole of a plurality of one-to-one on interim support 8 and the roof 1, wear to be equipped with in the through-hole and to wearing bolt 6, to wearing bolt 6 upper and lower both ends respectively with interim support 8 and roof 1 bottom end fixed connection.

As shown in fig. 5, the opposite-penetrating bolt 6 includes a screw 61, a spacer 62 and a nut 63, the screw 61 sequentially penetrates through the temporary support 8 and the top plate 1, the spacer 62 is sleeved on the upper and lower ends of the screw 61, and the upper and lower ends of the screw 61 are locked and connected by the nut 63.

The top plate 1 is provided with an exposed prestressed steel beam 14 in a burst area, a steel beam cushion block 12 is arranged between the prestressed steel beam 14 and the channel steel 9, and the upper end and the lower end of the steel beam cushion block 12 are fixedly connected with the prestressed steel beam 14 and the channel steel 9 respectively.

As shown in fig. 1 and 6, the first stiffening frameworks a-6 and a-7 are located in the middle of the top plate 1 bursting area, and include channel steel 9 respectively arranged at the bottom end of the top plate 1 and a temporary support 8 arranged at the top end of the top plate 1 along the transverse bridge direction, the temporary support 8 and the channel steel 9 are arranged oppositely, a plurality of through holes corresponding to one another are formed in the channel steel 9, the temporary support 8 and the top plate 1, through bolts 6 are arranged in the through holes in a penetrating manner, the through bolts 6 sequentially penetrate through the temporary support 8, the top plate 1 and the channel steel 9, the upper end and the lower end of each of the through holes are respectively fixedly connected with the temporary support 8 and the channel steel 9, and a temporary cushion block 11 is arranged between the temporary support 8 and the.

As shown in fig. 7, a gap exists between the bottom end of the top plate 1 and the channel steel 9, and the channel steel 9 is leveled by arranging a leveling cushion block 15 in the gap.

As shown in fig. 1 and 8, the second stiffening frameworks B-1 and B-2 are located at the edge of the bursting area of the top plate 1, and are located at the thickened section of the top plate 1, and each second stiffening framework B-1 and B-2 comprises a channel steel 9 and an anchor bolt 7, the channel steel 9 is arranged at the bottom end of the top plate 1, the top end of the anchor bolt 7 is inserted into the top plate 1, and the bottom end of the anchor bolt is fixedly connected with the channel steel 9.

The second stiffening frameworks B-3 and B-4 are fixedly arranged on the thickening section of the top plate 1 between the second stiffening framework B-2 and the first stiffening framework A-7 and comprise anchor bolts 7, and the anchor bolts 7 are inserted into the top plate 1 and are fixedly connected with the top plate.

Further, steel plates 13 are arranged on the upper surface and the lower surface of the top plate 1, holes corresponding to the through bolts 6 or the anchor bolts 7 are formed in the steel plates 13, the bolts penetrate through the holes, the steel plates 13 are adhered to the upper surface and the lower surface of the top plate 1 through smearing glue, and screws are screwed to fix the steel plates.

The top plate 1 is provided with a glue injection hole, and a grouting layer 5 is filled between the lower surface of the top plate 1 and the steel plate 13 through the glue injection hole.

The invention also provides a method for repairing the top plate 1 crack of the continuous beam bridge, which comprises the following steps:

s1: and (4) field inspection, which is to investigate and recheck the field, check the crack range and the relevant size of the top plate 1, detect the position of the prestressed steel beam 14 and use the position as a drilling basis, wherein the drilling comprises drilling of a glue injection hole and a bolt through hole, and the position of the drilling needs to be avoided from the position of the prestressed steel beam 14.

And S2, constructing the edge stiffening frameworks, namely installing the first stiffening frameworks A-1 and A-2 and the second stiffening frameworks B-1 and B-2 at the edge positions of the collapse area of the top plate 1 to prevent secondary collapse caused by disturbance generated in subsequent construction.

When the first frameworks A-1 and A-2 are installed, firstly, bolt through holes are drilled in the top plate 1 according to the drilling basis, the through holes in the channel steel 9 are aligned with the bolt through holes, the screw 61 penetrates through the two through holes, gaskets 62 are arranged at two ends of the screw 61, and the first frameworks A-1 and A-2 are fixed by screwing the nuts 63.

And S3, chiseling the concrete, and cleaning the peeled concrete one by one in sections for the areas with serious cracks so as to ensure the safety of the box girder structure and construction.

And S4, constructing an intermediate stiffening framework, namely installing first stiffening frameworks A-3 to A-7 and second stiffening frameworks B-3 and B-4 at intervals in the middle position of the crack area along the direction of the prestressed steel beam 14, and fixing the exposed prestressed steel beam 14 on the stiffening frameworks through the steel beam cushion block 12 to avoid the prestressed steel beam 14 from loosening. After the steel bundle is fixed, an electric or torque wrench is adopted to fasten the bolt.

Installing the first stiffening frameworks A-3 to A-7, firstly drilling bolt through holes on the top plate 1 according to drilling, aligning the through holes on the channel steel 9 or the temporary support 8 with the bolt through holes, penetrating the screw 61 through the two through holes, arranging gaskets 62 at two ends of the screw 61, and fixing by screwing the nuts 63.

And S5, connecting bottom layer steel bars, correcting the exposed bottom layer longitudinal and transverse steel bars in time when removing the loosened concrete in the crack area, connecting to form a steel bar mesh by adopting a binding mode, and connecting with the stiffening framework.

And S6, adhering the steel plate 13, processing the adhering surface of the top plate 1 and the steel plate 13, and coating an adhesive on the adhering surface for adhering. Specifically, the steel plate 13 includes the following steps:

s601: roof 1 surface treatment to cleaner concrete surface, can directly polish the binding face, removes 1 ~ 2mm thick top layer, exposes the new face completely, gets rid of the dust with compressed air or washes cleanly with the clear water, treats after the complete drying with acetone spray rinsing surface can.

For the surface of new concrete, firstly, a steel wire brush is used for brushing loose scum on the surface to expose a new surface, and then a scrubbing brush is used for dipping a detergent to scrub the surface or washing the surface with clear water until the surface is completely dried.

For concrete surfaces with high humidity, besides meeting the above requirements, artificial drying treatment is also needed. In order to better ensure the adhesion effect, the surface of the concrete should be roughened by roughening the surface. During construction, hard concrete is exposed according to the requirements of a drawing and the actual measurement condition is combined, a flat rough surface is formed, and then floating slag on the surface is removed by a steel wire wheel, and loose objects on the surface layer are removed. And (3) applying epoxy structural adhesive to the defect part of the concrete for repairing, grinding the defect part after curing, blowing out dust particles on the surface by using compressed air, wiping the surface for a plurality of times by using toluene or industrial acetone, and then drying the surface.

S602: and (3) treating the surface of the steel plate 13, wherein the steel plate 13 is not rusted or slightly rusted, the steel plate can be polished by sand blasting, abrasive cloth or a flat grinding wheel until metal luster appears, and then the adhered surface of the steel plate 13 is wiped clean by using absorbent cotton dipped with acetone. The larger the grinding roughness is, the better the grinding roughness is, and the grinding grains are perpendicular to the stress direction of the steel plate 13 as much as possible. If the steel plate 13 is seriously rusted, the steel plate must be soaked in moderate hydrochloric acid for 20 minutes to enable a rust layer to fall off, then is washed by lime water, and finally is polished by a flat grinding wheel to form a groove.

S603: and (3) drilling holes in the steel plate 13, wherein the holes in the steel plate 13 correspond to the concrete through holes in the top plate 1.

S604: and (4) installing the steel plate 13, enabling the bolts of the stiffening framework to penetrate through the holes of the steel plate 13 and screwing the bolts.

S605: the adhesive is prepared by mixing two components of A and B according to the ratio of 3:1 and needs to be temporarily prepared on site. During configuration, glue is strictly prepared according to the use instruction, weighing equipment is configured on site, metering is strictly carried out, and the proportion is ensured to be correct. Pouring the component A and the component B into a clean container, and directionally stirring the components in the same direction by a mechanical method until the color is uniform. The proportion of the mixed glue is properly adjusted according to the current local climatic conditions and the effective time.

S606: and (3) sticking the steel plate 13, after the adhesive is prepared, smearing the adhesive on the binding surface of the treated top plate 1 and the steel plate 13 by using a spatula, scraping a small amount of adhesive on the binding surface back and forth for several times, then smearing the adhesive to the thickness of 1-3 mm, and enabling the middle part to be thick and thin. If the vertical surface is pasted, a layer of dewaxing glass fiber cloth can be added to prevent flowing. After the steel plate 13 is pasted, the steel plate 13 is lightly knocked along the pasting surface by a hammer, after the steel plate 13 is pasted, the steel plate 13 is lightly knocked along the pasting surface by the hammer, if no cavity sound exists, the pasting is indicated to be dense, otherwise, the steel plate 13 is required to be peeled off and pasted again. And in the construction process of adhering the steel plate 13, the steel plate 13 needs to be continuously and lightly knocked to check the fullness of the adhesive under the steel plate 13 in time, if the adhesive at certain parts is insufficient, a hollow drum is formed, the bolts need to be loosened in time, and the adhesive is filled to the gap from the side surface of the steel plate 13, so that the steel plate 13 is smoothly and closely adhered.

S607: and (3) curing, namely curing is required after the steel plate 13 is adhered, the curing time is not less than 24 hours, the steel plate 13 cannot be disturbed during the curing period, and if the air temperature is low, manual heating can be adopted, and the steel plate is generally heated by an infrared lamp.

S608: the surface protection, surface cleaning of the outer surface of the member, dry film thickness, coating quality, construction process and the like need to strictly meet the technical requirements of anticorrosion coating technical conditions of highway bridge steel structures (JT/T722-.

S609: and (4) inspecting, wherein the adhering quality of the steel plate 13 adopts non-damage inspection. The main inspection contents are as follows: color and hardening degree of glue overflowing from the edge of the steel plate 13; the effective bonding area of the steel plate 13 is checked by knocking the steel plate 13 with a small hammer, the bonding curing effect is judged by sound, the effective bonding area of the anchoring area is not less than 95%, otherwise, the bonding is ineffective, and the steel plate is peeled off and bonded again.

S7: drilling a glue injection hole and pouring grouting material, pouring the grouting material between the bottom end part of the top plate 1 and the steel plate 13 through the glue injection hole according to the drilling of the glue injection hole on the top plate 1, and pouring structural glue in a gap between a bolt of the stiffening framework and the top plate 1 after the grouting material is solidified to reach certain strength.

S8: and (4) removing the temporary support 8, pre-tightening the bolts to 30KN again after the grouting material and the structural adhesive reach the strength, and then removing the temporary support 8.

S9: and (5) quality inspection and acceptance.

The technical scope of the present invention is not limited to the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and such changes and modifications should fall within the protective scope of the present invention.

Claims (9)

1. The utility model provides a reinforced structure that continuous beam bridge roof board bursts apart is applied to the roof and bursts apart the region, its characterized in that, including set up in the first stiffening framework of multiunit of roof isopachous section with set up in the multiunit second stiffening framework of roof section of becoming thick, the first stiffening framework of multiunit and multiunit second stiffening framework all set up along following the bridge to the interval, every group first stiffening framework includes along the bridge to a plurality of to wearing the bolt that the interval set up, wear to wearing the bolt and locate on the roof to rather than fixed connection, every group the second stiffening framework includes along a plurality of anchor bolts that the bridge set up to the interval, anchor bolt top portion inserts in the roof to rather than fixed connection.

2. The continuous beam bridge roof cracking reinforcing structure as claimed in claim 1, wherein the first stiffening framework further includes a channel steel disposed at the bottom end of the roof along the transverse direction, the channel steel and the roof are respectively provided with a plurality of through holes corresponding to one another, the through holes are penetrated by the through bolts, and the upper and lower ends of the through bolts are respectively fixedly connected with the top end of the roof and the bottom end of the channel steel.

3. The continuous beam bridge roof cracking reinforcing structure as claimed in claim 1, wherein the first stiffening frame further comprises a temporary support disposed above the roof along the transverse direction, the temporary support and the roof are respectively provided with a plurality of through holes corresponding to one another, the through holes are penetrated by the through bolts, and the upper and lower ends of the through bolts are respectively fixedly connected with the top end of the temporary support and the bottom end of the roof.

4. The continuous beam bridge roof slab spalling reinforcement structure of claim 1, wherein the second stiffening framework further comprises a channel steel arranged at the bottom end of the roof slab along the transverse bridge direction, the anchor bolt penetrates through the channel steel, and the top end of the anchor bolt is inserted into the roof slab.

5. The continuous beam bridge roof plate spalling reinforcement structure of claim 2 or 4, wherein the roof spalling region is provided with an exposed prestressed steel beam, a steel beam cushion block is arranged between the prestressed steel beam and the channel steel, and the upper end and the lower end of the steel beam cushion block are respectively fixedly connected with the prestressed steel beam and the channel steel.

6. The continuous beam bridge roof panel spalling reinforcement structure of claim 2 or 4, wherein a leveling cushion block is arranged between the bottom end of the roof panel and the channel steel for adjusting the channel steel to a horizontal state.

7. The continuous beam bridge roof cracking reinforcing structure of claim 1, wherein steel plates are adhered to the upper surface and the lower surface of the roof, and a grouting layer is filled between the lower surface of the roof and the steel plates through a glue injection hole formed in the roof.

8. The method for repairing the top plate crack of the continuous beam bridge is characterized by comprising the following steps:

1) the site inspection is carried out, the site is investigated and rechecked, the top plate crack range and the relevant size are verified, the position of the prestressed steel beam is detected and used as a drilling basis, and the position of the top plate drilling is avoided from the position of the prestressed steel beam;

2) constructing a side stiffening framework, namely installing a first stiffening framework and a second stiffening framework at the edge position of the top plate crack area to prevent secondary crack caused by disturbance generated in subsequent construction;

3) chiseling concrete, and cleaning the peeled concrete one by one in a segmented and cracked area;

4) constructing a middle stiffening framework, namely arranging first stiffening frameworks at intervals in the middle positions of the crack regions along the trend of the prestressed steel bundles, and fixing the exposed prestressed steel bundles on the stiffening frameworks;

5) the bottom layer steel bar is connected, the exposed bottom layer longitudinal and transverse steel bars are corrected, a binding mode is adopted for connection to form a steel bar mesh, and the steel bar mesh is connected with the stiffening framework;

6) pasting a steel plate, processing the pasting surface of the top plate and the steel plate, and smearing an adhesive on the pasting surface for pasting;

7) drilling a glue injection hole and pouring grouting material, according to the drilling of the glue injection hole on the top plate, pouring the grouting material between the bottom end part of the top plate and the steel plate through the glue injection hole, and after the grouting material is solidified to reach certain strength, pouring structural glue in a gap between the bolt of the stiffening framework and the top plate.

9. The method for repairing the top plate crack of the continuous beam bridge as claimed in claim 8, wherein the step of adhering the steel plate comprises the following steps:

carrying out surface treatment on the top plate, polishing the concrete binding surface of the top plate, removing a surface layer with the thickness of 1-2 mm, completely exposing a new surface, removing dust by using compressed air or washing the new surface by using clear water, completely drying, spraying acetone on the binding surface, and roughening the binding surface to make the binding surface rough;

the steel plate surface treatment, using sand blasting, abrasive cloth or flat grinding wheel to polish the steel plate binding surface, wherein the polishing lines are vertical to the steel plate stress direction until the metal luster appears, and then using absorbent cotton to be dipped in acetone to clean the steel plate binding surface;

drilling a steel plate, namely drilling holes in the steel plate, wherein the steel plate hole positions correspond to the positions of the top plate concrete through holes;

installing a steel plate, enabling bolts of the stiffening framework to penetrate through the holes of the steel plate and screwing the bolts;

mixing glue, namely weighing the A and B two components of the adhesive in proportion, and pouring the mixture into a container to be uniformly stirred;

the steel sheet is pasted, uses the spatula to scribble the adhesive on the binding face of the roof that has handled and steel sheet, makes a round trip to wipe in the faying face several times with a small amount of adhesive earlier, and then add and wipe to 1 ~ 3mm thickness, and the middle thick edge is thin, then pastes the steel sheet in preset position, and after the steel sheet was pasted, the steel sheet was strikeed gently along the binding face with the hammer, if there was not the cavity sound, it had pasted closely knit to show, otherwise should peel off the steel sheet, pastes again.

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