CN212611903U - Newly-built concrete beam body with reinforced structure of built-in steel sheet - Google Patents
Newly-built concrete beam body with reinforced structure of built-in steel sheet Download PDFInfo
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- CN212611903U CN212611903U CN202020327016.4U CN202020327016U CN212611903U CN 212611903 U CN212611903 U CN 212611903U CN 202020327016 U CN202020327016 U CN 202020327016U CN 212611903 U CN212611903 U CN 212611903U
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Abstract
The application relates to a newly-built concrete beam body with a reinforcing structure with a built-in steel plate, wherein an embedded groove for accommodating the reinforcing structure is formed in the surface of the beam body, the bottom surface of the embedded groove is parallel to the surface of the beam body, and the depth of the embedded groove is equal to the thickness of the reinforcing structure; the reinforcing structure sequentially comprises a steel plate strip, a high-performance concrete reinforcing layer, a carbon fiber cloth layer and a coating layer from inside to outside; the steel plate strip is tightly attached to the bottom of the caulking groove and is anchored with the beam body through a countersunk head bolt; a reinforcing mesh is arranged in the high-performance concrete reinforcing layer; the carbon fiber cloth layer is adhered to the high-performance concrete reinforcing layer; the appearance and the color of the coating layer are consistent with those of the main body of the newly-built concrete beam body. The utility model discloses guarantee that the roof beam body consolidates the district unanimous with not consolidating the district outward appearance, do not influence bridge outward appearance effect, solved traditional steel lath of pasting and consolidated and influence the pleasing to the eye shortcoming regret of bridge, with low costs, economic benefits is obvious, does not influence the crack resistance and the bearing capacity of bridge.
Description
Technical Field
The application relates to the field of structural reinforcement, in particular to a newly-built concrete beam body with a reinforcing structure with a built-in steel plate.
Background
At present, in severe cold areas, due to the influence of low-temperature weather, a part of newly-built bridges are shut down due to the influence of a winter-rest period after a certain section of cantilever construction. During the winter rest period, because the local quality defect of concrete (not closely knit, have the cavity), vertical crack appears easily in continuous bridge box girder web section, and under the serious condition, vertical crack develops the position of vertical prestressing tendons even, especially when vertical prestressing force system is sealed not well, can provide the condition for health preserving water, rainwater, snow water get into in the vertical pipeline for vertical prestressing force pipeline grout outlet has rivers to go out, thereby make the full water degree of water in the concrete gap high, the concrete is ftractureed under the frost heaving and the freeze-thaw cycle effect of health preserving water, sleet weather moisturizing. Especially, the vertical crack of the front end face of the web cantilever is long, the depth of the crack is deep, the crack intersects with the vertical prestressed duct, the web of the original structure is divided into 2 layers by the crack, the bearing capacity of the structure is unfavorable, and structural reinforcement needs to be carried out on the web with concrete cracking. The traditional reinforcing method has two types, one type is the thickness of an increased web plate, the reinforcing method can enhance the bearing capacity of the structure, but changes the overall dimension of the bridge, so that the reinforced web plate is obviously not matched with the web plate of subsequent construction, the web plate cracks can not be effectively prevented from being re-developed when the prestress is tensioned, the traditional steel plate reinforcing method is adopted, steel plate strips are adhered to the outer side of the bridge structure and are jointly stressed with the bridge structure, the web plate cracks can be effectively prevented from being re-developed when the prestress is tensioned, but the appearance of the bridge with the changed steel plate is adhered, especially for a newly-built bridge, when the conventional steel plate reinforcing method is adopted, the size and the appearance of the structure are inconsistent with the original design, and troubles are caused for the acceptance of the bridge completion.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a newly-built concrete beam body with reinforced structure of built-in steel sheet to the inconsistent problem of beam body reinforcing area and not reinforcing district outward appearance among the solution correlation technique.
In a first aspect, a newly-built concrete beam body with a reinforcing structure with a built-in steel plate is provided, wherein an embedded groove for accommodating the reinforcing structure is formed in the surface of the beam body, the bottom surface of the embedded groove is parallel to the surface of the beam body, and the depth of the embedded groove is equal to the thickness of the reinforcing structure; the reinforcing structure sequentially comprises a steel plate strip, a high-performance concrete reinforcing layer, a carbon fiber cloth layer and a coating layer from inside to outside; wherein:
the steel plate strip is tightly attached to the bottom of the caulking groove and is anchored with the beam body through a countersunk head bolt;
a reinforcing mesh is arranged in the high-performance concrete reinforcing layer;
the carbon fiber cloth layer is adhered to the high-performance concrete reinforcing layer;
the appearance and the color of the coating layer are consistent with those of the main body of the newly-built concrete beam body.
In some embodiments, the surface of the beam body is provided with a caulking groove along the direction of the crack, a plurality of steel plates are arranged in the caulking groove, and all the steel plates cross the crack. And gaps among the steel plate strips are filled with high-performance concrete.
In some embodiments, the caulking grooves are symmetrically distributed on the inner surface and the outer surface of the web plate of the beam body, and the countersunk head bolt penetrates through the rear part of the beam body and is connected with the steel plate strips on the inner surface and the outer surface of the web plate of the beam body.
In some embodiments, the bottom of the caulking groove is a steel bar protection layer, and the thickness of the steel bar protection layer is not less than 5 mm.
In some embodiments, the method of applying the reinforcing structure within the caulking groove is:
an anchoring hole for a countersunk anchor bolt to pass through is drilled in the embedding groove;
sticking a steel plate strip on the bottom surface of the caulking groove, and anchoring the steel plate strip on the beam body by using a countersunk anchor bolt;
hanging a reinforcing mesh outside the steel plate strip, then pouring high-performance concrete, and forming a high-performance concrete reinforcing layer by the high-performance concrete and the reinforcing mesh;
after the high-performance concrete is solidified, adhering a layer of carbon fiber cloth on the outer side of the high-performance concrete, and forming a carbon fiber cloth layer by the carbon fiber cloth and the adhesive;
and coating the same material as the surface of the beam body on the surface of the carbon fiber cloth to form a coating layer, wherein the appearance and the color of the coating layer are consistent with those of the main body of the newly-built concrete beam body, and after coating, the reinforced area is flush with the original surface of the beam body.
In some embodiments, the anchoring holes are through holes, two ends of each anchoring hole are respectively located in symmetrical caulking grooves, the caulking grooves are symmetrically distributed on the upper surface and the lower surface of the beam body, and the countersunk head bolts penetrate through the steel plate strips which are connected with the upper surface and the lower surface of the beam body.
In some embodiments, the steel plate strip is provided with an opening for the countersunk bolt to pass through, the size of the opening is matched with that of the countersunk bolt, the nut of the countersunk bolt does not protrude out of the steel plate strip, and the countersunk bolt is arranged at a position to avoid the prestressed pipeline of the beam web. Adopt the countersunk anchor to anchor the steel sheet, can guarantee that the nut of countersunk bolt does not stick out in the lath, reduce the gross thickness of lath and bolt to reduce the degree of depth of caulking groove. The size of the through hole for the countersunk head bolt to pass through is matched with that of the countersunk head bolt, and the through hole is required to avoid the position of the prestressed pipeline of the beam web, so that the beam strength is prevented from being influenced.
In some embodiments, the steel strip has a thickness of no more than 8 mm.
In some embodiments, the mesh reinforcement is HRB400 grade steel bars with the diameter of 8mm, the longitudinal spacing of the mesh reinforcement is 50mm, and the transverse spacing of the mesh reinforcement is 50 mm.
In some embodiments, the high performance concrete reinforcement layer has a compressive strength in excess of 100MPa and an axial tensile strength in excess of 8 MPa.
In some embodiments, the high performance concrete reinforcement layer has a thickness of no more than 20 mm.
In some embodiments, the carbon fiber cloth layer has an area weight of not less than 300 g/m, a thickness of not less than 0.167mm, a tensile strength of not less than 3400MPa, and an elastic modulus of not less than 2.4 × 105Elongation of not less than 1.5%; the thickness of the carbon fiber cloth layer is not more than 2 mm.
In some embodiments, the coating layer is made of the same coating material as the bridge main body.
The beneficial effect that technical scheme that this application provided brought includes: the utility model discloses can guarantee that the roof beam body consolidates the district unanimous with not consolidating the district outward appearance, do not influence the crack resistance and the bearing capacity of bridge outward appearance effect and bridge, solve traditional steel plate strip that pastes and consolidate and influence the pleasing to the eye shortcoming of bridge, easy operation, swift, with low costs, economic benefits is obvious.
The embodiment of the application provides a newly-built concrete beam body of reinforced structure with built-in steel sheet, hide reinforced structure at the internal portion of roof beam through the mode of opening the caulking groove on roof beam body surface, with the colour that reinforced structure application and roof beam body main part are the same, make roof beam body reinforcing area unanimous with not reinforcing area outward appearance, this application passes through countersunk head bolt with the lath and the anchor of roof beam body, and apply high performance concrete back up coat outside the lath and prevent that inner structure corrodes and surface fracture, consequently, the crack resistance and the bearing capacity of bridge are just not influenced to this application reinforcing effect pleasing to the eye.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a diagram illustrating a positional relationship between a reinforcing structure and a newly-built concrete beam body according to an embodiment of the present application;
FIG. 2 is a schematic view of a reinforcement structure provided in an embodiment of the present application;
FIG. 3 is a diagram illustrating the location of a reinforcing structure in relation to a crack according to an embodiment of the present disclosure;
the concrete reinforcing structure comprises 1-a reinforcing structure, 2-a beam body, 3-a steel plate strip, 4-a high-performance concrete reinforcing layer, 5-a carbon fiber cloth layer, 6-a countersunk head bolt, 7-a coating layer and 8-a crack.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a newly-built concrete beam body with reinforced structure of built-in steel sheet, and it can solve the beam body and consolidate the district and not consolidate the inconsistent problem of district outward appearance.
FIG. 1 is a diagram illustrating the position relationship between a reinforcing structure and a newly-built concrete beam body according to an embodiment of the present application;
FIG. 2 is a schematic view of a reinforcement structure provided in an embodiment of the present application;
FIG. 3 is a diagram illustrating the location of a reinforcing structure in relation to a crack according to an embodiment of the present disclosure;
as shown in fig. 1 to 3, the surface of the beam body is provided with an embedded groove for accommodating the reinforcing structure, the bottom surface of the embedded groove is parallel to the surface of the beam body, and the depth of the embedded groove is equal to the thickness of the reinforcing structure; the reinforcing structure sequentially comprises a steel plate strip, a high-performance concrete reinforcing layer, a carbon fiber cloth layer and a coating layer from inside to outside; wherein:
the steel plate strip is tightly attached to the bottom of the caulking groove and is anchored with the beam body through a countersunk head bolt;
the reinforcing mesh is arranged in the high-performance concrete reinforcing layer, so that the steel plate strip can be effectively protected and is not easily corroded by the external environment;
the carbon fiber cloth layer is adhered to the high-performance concrete reinforcing layer, so that the corrosion resistance of the steel plate in the reinforcing area can be further enhanced;
the appearance and the color of the coating layer are consistent with those of the main body of the newly-built concrete beam body, the coating process is also consistent with those of the newly-built concrete beam body, the color of the outer surface of the reinforcement area is consistent with that of the main body of the newly-built concrete beam body, and the attractiveness of a bridge and acceptance of the completion of the bridge are not influenced.
Preferably, the surface of the beam body is provided with an embedded groove along the trend of the crack, the embedded groove completely covers the crack, a plurality of steel plates are arranged in the embedded groove, and all the steel plates stretch across the crack.
Preferably, the caulking grooves are symmetrically distributed on the upper surface and the lower surface of the beam body, and the countersunk head bolts penetrate through the steel plate strips which are connected with the upper surface and the lower surface of the beam body behind the beam body.
Preferably, the thickness of the steel bar protection layer is not less than 5 mm.
Preferably, the steel plate strip is provided with an opening, the size of the opening is matched with that of the countersunk head bolt, the nut of the countersunk head bolt does not protrude out of the steel plate strip, so that the total thickness of the steel plate strip and the anchor bolt is reduced, and the thickness of the steel plate strip is not more than 8 mm.
Preferably, HRB 400-grade steel bars with the diameter of 8mm are adopted as the mesh reinforcements, the longitudinal spacing of the mesh reinforcements is 50mm, and the transverse spacing of the mesh reinforcements is 50 mm.
Preferably, the high performance concrete has a compressive strength of over 100MPa and an axial tensile strength of over 8 MPa.
Preferably, the high performance concrete reinforcing layer has a thickness of no more than 20 mm.
Preferably, the area weight of the carbon fiber cloth is not less than 300 g/square meter, the thickness is not less than 0.167mm, the tensile strength is not less than 3400MPa, and the elastic modulus is not less than 2.4 multiplied by 105And the elongation is not less than 1.5%.
Preferably, the thickness of the carbon fiber cloth layer does not exceed 2 mm.
Preferably, the coating material adopted by the coating layer is the same as that of the bridge main body, and the coating process is the same.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The following provides a detailed description of the installation of the present invention with reference to the drawings and the detailed description.
(1) The method comprises the steps of (1) ascertaining the position, length, width and depth of a crack generated by frost heaving of a newly-built concrete beam body, wherein the length of the crack is measured by a calibrated steel tape, the width of the crack is measured by an intelligent crack width observation instrument with the resolution of 0.01mm, the depth of the crack is measured by an ultrasonic sounding method, and if necessary, a core drilling method is adopted for rechecking; after characteristics such as crack distribution condition, crack length, width and depth are found out, a plurality of air holes are arranged along the crack direction, wherein one end of each air hole is positioned in the crack, and the other end of each air hole is positioned on the surface of the beam body; wherein, the uppermost air hole is an air inlet hole, the other air holes are air outlet holes, and all the air holes are communicated with the crack, so that the moisture in the crack can be volatilized; the arrangement distance of the air holes is determined according to the width of the steel plate strip to be used, and the positions of the air holes are kept away from the position for sticking the steel plate strip as far as possible.
(2) And continuously filling dry air into the air inlet hole by using an air compressor, carrying moisture in the crack out when the dry air escapes from the air outlet hole, and stopping filling the dry air after 48 hours. The time for filling the dry air can be properly increased or decreased according to the actual situation on site.
(3) And (3) stretching the vertical prestressed tendons of the beam section where the cracks are located, and ensuring synchronous stretching of the vertical prestressed tendons which are symmetrical at the upstream and the downstream during stretching so as to ensure uniform stress of the structure. During tensioning, a special jack is adopted, and after the tonnage is reached, the nut is screwed down to reduce the oil pressure. And (4) redrawing the vertical prestress the next day, wherein the tensile force reaches the design requirement. And after tensioning is finished, carrying out vacuum grouting treatment on the vertical prestressed pipeline.
(4) Repairing existing cracks of the beam body: when the width of the crack is more than or equal to 0.15mm, grouting treatment is carried out according to a wall grouting method, the method adopts chemical grouting to repair the crack, on one hand, the internal tissues of the structure are combined into a whole as much as possible by the adhesive force of the adhesive, so that the internal tissues of the structure can recover the required strength; on the other hand, air and moisture are blocked from entering the structure, so that the steel bars and concrete are prevented from being corroded, and the durability of the structure is improved; when the width of the crack is less than 0.15mm, the epoxy daub is adopted for sealing so as to achieve the purposes of recovering and improving the structural durability and impermeability. And after the crack is repaired, all the distributed air holes are sealed by adopting epoxy daub.
(5) And determining the layout mode of the area to be reinforced and the steel plate strips, wherein the area of the area to be reinforced is covered with the area where the crack is located, the steel plate strips cross the crack and avoid the air holes, and the plate thickness, the plate width and the plate height of the steel plate strips are determined according to theoretical calculation results. Generally, the thickness of the steel plate strip is not more than 8 mm.
(6) The distribution conditions of main reinforcements and prestressed reinforcements of a beam body in a region to be reinforced and the thickness of a reinforcement protection layer are detected by adopting an electromagnetic induction method, part of concrete on the surface layer of the reinforcement protection layer on the inner side and the outer side of a web plate of the beam body in the region to be reinforced is chiseled off, the concrete with the thickness of about 5mm at the bottom of the reinforcement protection layer is reserved, an embedded groove parallel to the surface of the beam body is formed on the surface of the beam body, when the reinforcement protection layer is chiseled off, the main reinforcements and the prestressed reinforcements of the beam body are prevented from being damaged, and the thickness of the chisele; and then, anchoring holes for the countersunk anchor bolts to pass through are drilled in the caulking grooves, the anchoring holes are through holes, the caulking grooves are symmetrically distributed on the surfaces of the two sides of the beam body, and the two ends of each anchoring hole are respectively positioned in the symmetrical caulking grooves.
(7) And a plurality of steel plate strips crossing the crack are adhered to the bottom surface of the caulking groove to reinforce the beam body. The main process for sticking the steel plate strips comprises the following steps: processing the surface of the component → implanting an anchor bolt rod → installing a steel plate strip → installing a glue injection pipe and an exhaust pipe → sealing the periphery of the steel plate → injecting glue under pressure. The anchor rod is a countersunk anchor, the size of an opening is matched with that of a countersunk bolt when the steel plate strip is opened, and a nut of the countersunk bolt is not protruded above the steel plate strip; the anchor bolt is arranged in the beam body at a position avoiding the position of the box girder web prestressed pipe.
(8) And applying a high-performance concrete reinforcing layer containing a steel bar net outside the steel plate strips. The reinforcing bar net adopts HRB400 grade reinforcing bar with the diameter of 8mm, the longitudinal spacing of the reinforcing bar is 50mm, and the transverse spacing is 50 mm. The compression strength of the adopted high-performance concrete is more than 100MPa, and the axial tensile strength of the concrete exceeds 8 MPa. The total thickness of the high-performance concrete reinforcing layer is not more than 20mm, the high-performance concrete is adopted because the high-performance concrete is not easy to crack compared with the original beam body and the same-grade concrete, and the high-performance concrete reinforcing layer with the thickness not more than 20mm can be applied to prevent the cracking.
(9) And a layer of carbon fiber cloth is adhered to the outer side of the high-performance concrete reinforcing layer. The main steps of pasting the carbon fiber cloth are as follows: coating resin on the bottom layer → leveling treatment → pasting carbon fiber cloth → maintenance of the carbon fiber cloth and the like. Wherein, the bottom resin is dried naturally after being coated evenly, the drying time is changed between 3 hours and 1 day because of different temperature, and a polishing machine or a sand paper is used for polishing when the surface of the component is provided with bulges after the primer is hardened. The areal weight of the carbon fiber cloth is not less than 300 g/square meter, the thickness is not less than 0.167mm, the tensile strength is not less than 3400MPa, and the elastic modulus is not less than 2.4 multiplied by 105And the elongation is not less than 1.5%. The total thickness of the carbon fiber cloth and its substrate should not exceed 2 mm.
(10) And coating the surface of the carbon fiber cloth, wherein the coating material and the coating process are consistent with those of the original bridge structure, so that the color of the outer surface of the reinforcing area is consistent with that of the original concrete structure of the bridge body.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The utility model provides a newly-built concrete beam body with reinforced structure of built-in steel sheet which characterized in that: the surface of the beam body is provided with an embedded groove for accommodating a reinforcing structure, the bottom surface of the embedded groove is parallel to the surface of the beam body, the depth of the embedded groove is equal to the thickness of the reinforcing structure, and the shape of the embedded groove is matched with that of the reinforcing structure;
the reinforced structure sequentially comprises from inside to outside:
the steel plate strip is tightly attached to the bottom of the caulking groove and is anchored with the beam body through a countersunk bolt;
the high-performance concrete reinforcing layer is internally provided with a reinforcing mesh;
the carbon fiber cloth layer is adhered to the high-performance concrete reinforcing layer;
and the coating layer is consistent with the appearance and the color of the main body of the newly-built concrete beam body.
2. The newly constructed concrete beam body having a reinforcing structure with a built-in steel plate according to claim 1, wherein: the beam body surface is equipped with the caulking groove along the crack trend, and the caulking groove covers the crack completely, is equipped with a plurality of laths in the caulking groove, and all laths all span the crack.
3. The newly constructed concrete girder body having a reinforcing structure with a built-in steel plate according to claim 1 or 2, wherein: the caulking grooves are symmetrically distributed on the inner surface and the outer surface of the web plate of the beam body, and the countersunk head bolts penetrate through the beam body and then are connected with the steel plate strips on the inner surface and the outer surface of the web plate of the beam body.
4. The newly constructed concrete beam body having a reinforcing structure with a built-in steel plate according to claim 1, wherein: the caulking groove bottom is the reinforcing bar protective layer, the thickness of reinforcing bar protective layer is not less than 5 mm.
5. The newly constructed concrete beam body having a reinforcing structure with a built-in steel plate according to claim 1, wherein: the steel plate strip is provided with an opening through which the countersunk head bolt penetrates, the size of the opening is matched with that of the countersunk head bolt, the nut of the countersunk head bolt does not protrude out of the steel plate strip, and the thickness of the steel plate strip is not more than 8 mm.
6. The newly constructed concrete beam body having a reinforcing structure with a built-in steel plate according to claim 1, wherein: the reinforcing bar net adopts HRB 400-grade reinforcing bars with the diameter of 8mm, the longitudinal distance of the reinforcing bar net is 50mm, and the transverse distance of the reinforcing bar net is 50 mm.
7. The newly constructed concrete beam body having a reinforcing structure with a built-in steel plate according to claim 1, wherein: the compressive strength of the high-performance concrete reinforcing layer exceeds 100MPa, and the axial tensile strength exceeds 8 MPa.
8. The newly constructed concrete beam body having a reinforcing structure with a built-in steel plate according to claim 1, wherein: the thickness of the high-performance concrete reinforcing layer is not more than 20 mm.
9. The newly constructed concrete beam body having a reinforcing structure with a built-in steel plate according to claim 1, wherein: the area weight of the carbon fiber cloth layer is not less than 300 g/square meter, the thickness is not less than 0.167mm, the tensile strength is not less than 3400MPa, and the elastic modulus is not less than 2.4 multiplied by 105Elongation of not less than 1.5%; the thickness of the carbon fiber cloth layer is not more than 2 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114197338A (en) * | 2022-01-10 | 2022-03-18 | 湖南大学 | Large-span PC box girder bridge reinforcing structure and reinforcing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114197338A (en) * | 2022-01-10 | 2022-03-18 | 湖南大学 | Large-span PC box girder bridge reinforcing structure and reinforcing method |
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