Prestress reinforcing device for arch bridge and construction method thereof

Abstract

The invention discloses a prestress reinforcing device for an arch bridge and a construction method of the prestress reinforcing device, and belongs to the technical field of bridge reinforcement. The prestress reinforcing device comprises a prestress carbon fiber plate which is made of a high-strength carbon fiber composite material and is used for enhancing the bending resistance of a main arch ring of the arch bridge; the anchoring assembly comprises an upper anchorage device and a lower anchorage device; the tensioning assembly applies prestress to the prestressed carbon fiber plate through a hydraulic jack, so that the prestressed carbon fiber plate is tightly combined with the arch bridge main arch ring; and the anti-corrosion protection layer wraps the outer side of the prestressed carbon fiber plate and is made of bi-component epoxy resin or other anti-corrosion materials. According to the prestress reinforcing device for the arch bridge and the construction method of the prestress reinforcing device, the problems that an existing arch bridge reinforcing method is long in construction period, high in cost and large in influence on an original structure are solved, the light high-strength carbon fiber material and the prestress technology are combined, and the bearing capacity of the main arch ring of the arch bridge can be remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge reinforcement, and particularly to a prestressed reinforcement device for arch bridges and a construction method thereof. Background Art

[0002] At present, in the central and western regions, the transportation of extra-large and extra-heavy industrial large-scale equipment (such as large power generation equipment, heavy equipment, and construction machinery) by road has shown a normal trend. The load standards of early-built arch bridges are relatively low, and the load of large-scale equipment transportation vehicles often far exceeds the design live load of the bridges. The large load effect is greater than the design effect of the operating bridges. To ensure the operation safety of the transportation equipment and the bridges, such bridges are usually demolished and rebuilt or strengthened and upgraded.

[0003] At present, the commonly used reinforcement methods for arch bridges mainly include three methods: increasing the main arch section, adjusting the dead load of the superstructure on the arch, and enhancing the integrity. The commonly used reinforcement methods for arch bridges usually adopt methods such as concrete pouring and steel plate pasting, but these methods have the disadvantages of long construction period, high cost, and great influence on the original structure. Therefore, there is an urgent need for an efficient, economical, and reliable arch bridge reinforcement device and method. Summary of the Invention

[0004] The purpose of the present invention is to provide a prestressed reinforcement device for arch bridges and a construction method thereof, aiming to solve the problems of long construction period, high cost, and great influence on the original structure in the existing arch bridge reinforcement methods, and combining lightweight and high-strength carbon fiber materials with prestress technology, which can significantly improve the bearing capacity of the main arch ring of the arch bridge.

[0005] To achieve the above purpose, the present invention provides a prestressed reinforcement device for arch bridges, including:

[0006] Prestressed carbon fiber plates: made of high-strength carbon fiber composite materials, used to enhance the bending resistance of the main arch ring of the arch bridge; its thickness range is 5 mm - 20 mm, and the ultimate tensile strength is 2000 MPa - 3000 MPa;

[0007] Anchoring components: including upper anchorages and lower anchorages, both the upper anchorages and the lower anchorages are provided with internal threaded holes, and the thread hole specifications are M20 - M40;

[0008] Tensioning components: applying prestress to the prestressed carbon fiber plates through hydraulic jacks to make them closely combined with the main arch ring of the arch bridge; the rated pressure range of the hydraulic jacks is 100 MPa - 200 MPa, the diameter of the tension rods is 20 mm - 40 mm, and high-strength alloy steel materials are used;

[0009] Anticorrosion protection layer: Wrapped around the outside of the prestressed carbon fiber plate, made of two-component epoxy resin or other corrosion-resistant materials, with a thickness range of 2 mm - 5 mm, and the tensile strength after curing is not less than 50 MPa, which can effectively prevent the corrosion of the carbon fiber plate by the external environment.

[0010] Preferably, the paving direction of the prestressed carbon fiber plate is consistent with the axis direction of the main arch ring of the arch bridge, and the laying angle error does not exceed ±2°, so as to ensure uniform stress.

[0011] Preferably, the upper anchor is located at the top or near the top of the main arch ring of the arch bridge, and is used to fix one end of the prestressed carbon fiber plate; the lower anchor is located at the bottom or near the bottom of the main arch ring of the arch bridge, and is used to fix the other end of the prestressed carbon fiber plate.

[0012] Preferably, both the upper anchor and the lower anchor are fixed to the main arch ring of the arch bridge by bolts to ensure the firm connection of the prestressed carbon fiber plate; elastic washers are provided at the bolt connection parts of the upper anchor and the lower anchor to compensate for the thermal expansion and contraction effects caused by temperature changes.

[0013] Preferably, the hydraulic jack of the tensioning assembly is equipped with a displacement sensor and a pressure sensor, which are used to monitor the prestress value and displacement in real time to ensure precise control during the construction process.

[0014] Preferably, the surface of the anticorrosion protection layer is provided with anti-slip textures, and the texture depth is 0.1 mm - 0.3 mm, which can increase the friction and reduce the accumulation of rainwater.

[0015] The present invention also provides a construction method for a prestressed reinforcement device for an arch bridge, including the following steps:

[0016] Step S1: Clean the surface of the main arch ring of the arch bridge, remove dust, oil stains and other impurities on the surface; use a high-pressure water jet cleaning device for cleaning, the cleaning pressure range is 50 MPa - 100 MPa, and the cleaning time is not less than 10 minutes;

[0017] Step S2: Install the anchoring assembly, install the upper anchor and the lower anchor at the top and bottom of the main arch ring of the arch bridge respectively, and firmly connect them to the main arch ring of the arch bridge by bolts; the bolt tightening torque range is 200 Nm - 400 Nm;

[0018] Step S3: Lay the prestressed carbon fiber plate, lay the prestressed carbon fiber plate along the outside of the main arch ring of the arch bridge, and ensure that the fitting error with the main arch ring of the arch bridge does not exceed ±1 mm;

[0019] Step S4: Apply prestress, apply prestress to the prestressed carbon fiber plate through the tensioning assembly, the prestress value is 70% - 80% of the ultimate tensile strength of the carbon fiber plate, and keep it constant for 30 minutes and then release the tensile force;

[0020] Step S5: Install the anti-corrosion protective layer. Apply or wrap the anti-corrosion protective layer on the outer side of the prestressed carbon fiber plate. Use the spraying process, with the spraying thickness being uniform and the error not exceeding ±0.2 mm. After spraying, cure it at room temperature for 24 hours.

[0021] Preferably, in step S1, use a high-pressure water jet cleaning device. During the cleaning process, keep the distance between the nozzle and the surface of the arch bridge at 10 cm - 20 cm to avoid damaging the surface of the arch bridge.

[0022] Preferably, in step S4, the prestress value is monitored in real time through a displacement sensor and a pressure sensor, and the error range does not exceed ±1%.

[0023] Preferably, in step S5, after spraying, cure it for 24 hours in an environment with a temperature of 20°C - 30°C and a humidity of 50% - 70% to ensure the quality of the anti-corrosion protective layer.

[0024] Therefore, the present invention adopts the above-mentioned prestressed reinforcement device for arch bridges and its construction method, and the technical effects are as follows:

[0025] In the present invention, the prestressed carbon fiber plate is adopted. Due to its high strength and light weight characteristics, it can significantly improve the load-bearing capacity of the arch bridge and effectively shorten the construction period at the same time.

[0026] Compared with the traditional concrete or steel plate pasting method, the cost of the present invention is lower.

[0027] By applying prestress, it can ensure that the prestressed carbon fiber plate is tightly combined with the main arch ring of the arch bridge, enhancing the reinforcement effect and having good reliability.

[0028] The anti-corrosion protective layer effectively protects the carbon fiber plate from the influence of the external environment and extends the service life of the reinforcement device.

[0029] Next, through the drawings and embodiments, the technical solutions of the present invention will be further described in detail. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of an embodiment of a prestressed reinforcement device for an arch bridge according to the present invention;

[0031] Figure 2 It is a schematic step diagram of an embodiment of a construction method of a prestressed reinforcement device for an arch bridge according to the present invention.

[0032] Reference Signs

[0033] 1. Main arch ring of the arch bridge; 2. Prestressed carbon fiber plate; 3. Upper anchor; 4. Lower anchor;

[0034] 5. Anticorrosion protection layer. Detailed implementation mode

[0035] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meaning understood by those with ordinary skills in the field to which the present invention belongs. The words such as "including" or "comprising" used in the present invention mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. "Upper", "lower", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0037] Embodiment 1

[0038] As Figure 1 shown, the present invention provides a prestressed reinforcement device for an arch bridge, including:

[0039] Prestressed carbon fiber board 2: Made of high-strength carbon fiber composite material, used to enhance the bending resistance of the main arch ring 1 of the arch bridge; its thickness ranges from 5 mm to 20 mm, and the ultimate tensile strength is 2000 MPa to 3000 MPa; the paving direction of the prestressed carbon fiber board 2 is consistent with the axis direction of the main arch ring 1 of the arch bridge, and the laying angle error does not exceed ±2°, so as to ensure uniform stress.

[0040] Anchoring assembly: Includes an upper anchor 3 and a lower anchor 4. Both the upper anchor 3 and the lower anchor 4 are provided with internal threaded holes, and the thread hole specifications are M20 - M40; the upper anchor 3 is located at the top or near the top of the main arch ring 1 of the arch bridge, used to fix one end of the prestressed carbon fiber board 2; the lower anchor 4 is located at the bottom or near the bottom of the main arch ring 1 of the arch bridge, used to fix the other end of the prestressed carbon fiber board 2.

[0041] Both the upper anchor 3 and the lower anchor 4 are fixed to the main arch ring 1 of the arch bridge by bolts to ensure the firm connection of the prestressed carbon fiber board 2; elastic washers are provided at the bolt connection parts of the upper anchor 3 and the lower anchor 4 to compensate for the thermal expansion and contraction effects caused by temperature changes.

[0042] Tensioning assembly: Apply prestress to the prestressed carbon fiber board 2 through a hydraulic jack to make it closely combine with the main arch ring of the arch bridge; the rated pressure range of the hydraulic jack is 100 MPa to 200 MPa, the diameter of the tensioning rod is 20 mm to 40 mm, and high-strength alloy steel material is used; the hydraulic jack of the tensioning assembly is equipped with a displacement sensor and a pressure sensor, used to monitor the prestress value and displacement in real time to ensure precise control during the construction process.

[0043] Figure 1 There are no relevant components of the tensioning assembly. The hydraulic jack and the tensioning rod are sequentially laid under the prestressed carbon fiber plate 2, and the relevant components of the tensioning assembly are removed after the prestress application is completed. Both the upper anchor 3 and the lower anchor 4 are of a hollow structure, and the tensioning rod can penetrate through the upper anchor 3 and the lower anchor 4 and directly contact the prestressed carbon fiber plate 2.

[0044] Anticorrosion protective layer 5: Wrapped around the outside of the prestressed carbon fiber plate 2, made of two-component epoxy resin or other corrosion-resistant materials, with a thickness range of 2 mm - 5 mm, and the tensile strength after curing is not less than 50 MPa, which can effectively prevent the corrosion of the carbon fiber plate by the external environment. The surface of the anticorrosion protective layer 5 is provided with anti-slip textures with a texture depth of 0.1 mm - 0.3 mm, which can increase the friction and reduce the accumulation of rainwater.

[0045] As Figure 2 shown, the present invention also provides a construction method for an efficient reinforcement device for an arch bridge, including the following steps:

[0046] Step S1, clean the surface of the main arch ring 1 of the arch bridge, removing dust, oil stains and other impurities on the surface; use a high-pressure water jet cleaning device for cleaning, with the cleaning pressure range of 50 MPa - 100 MPa and the cleaning time not less than 10 minutes; during the cleaning process, the distance between the nozzle and the surface of the arch bridge needs to be maintained at 10 cm - 20 cm to avoid damaging the surface of the arch bridge.

[0047] Step S2, install the anchoring assembly, install the upper anchor 3 and the lower anchor 4 at the top and bottom of the main arch ring 1 of the arch bridge respectively, and firmly connect them to the main arch ring 1 of the arch bridge through bolts; the bolt tightening torque range is 200 Nm - 400 Nm;

[0048] Step S3, lay the prestressed carbon fiber plate 2, lay the prestressed carbon fiber plate 2 along the outside of the main arch ring 1 of the arch bridge, and ensure that the fitting error between it and the main arch ring 1 of the arch bridge does not exceed ±1 mm;

[0049] Step S4, apply prestress, apply prestress to the prestressed carbon fiber plate 2 through the tensioning assembly, with the prestress value being 70% - 80% of the ultimate tensile strength of the carbon fiber plate, and keep it constant for 30 minutes and then release the tensile force; the prestress value is monitored in real time by a displacement sensor and a pressure sensor, and the error range does not exceed ±1%.

[0050] Step S5, install the anticorrosion protective layer 5, apply or wrap the anticorrosion protective layer 5 on the outside of the prestressed carbon fiber plate 2, adopt a spraying process, with the spraying thickness being uniform and the error not exceeding ±0.2 mm; after spraying, cure it for 24 hours in an environment with a temperature of 20°C - 30°C and a humidity of 50% - 70% to ensure the quality of the anticorrosion protective layer 5.

[0051] Therefore, the present invention adopts the above-mentioned prestressed reinforcement device for arch bridges and its construction method, aiming to solve the problems of long construction period, high cost and great influence on the original structure in the existing arch bridge reinforcement methods, and combines the lightweight and high-strength carbon fiber material with prestress technology, which can significantly improve the bearing capacity of the main arch ring of the arch bridge.

[0052] It should be noted that the content not elaborated in detail in the present invention is all prior art and is well known to those skilled in the art.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions of the present invention or make equivalent substitutions, and these modifications or equivalent substitutions cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A prestressed reinforcement device for an arch bridge, characterized in that, Including: Prestressed carbon fiber plate: Made of high-strength carbon fiber composite material, used to enhance the flexural capacity of the main arch ring of the arch bridge; Its thickness ranges from 5mm to 20mm, and the ultimate tensile strength is from 2000MPa to 3000MPa; Anchoring assembly: Includes an upper anchor and a lower anchor. Both the upper anchor and the lower anchor are provided with internal threaded holes, and the thread hole specifications are M20 - M40; Tensioning assembly: Applies prestress to the prestressed carbon fiber plate through a hydraulic jack to make it closely combine with the main arch ring of the arch bridge; The rated pressure range of the hydraulic jack is from 100MPa to 200MPa, the diameter of the tension rod is from 20mm to 40mm, and it is made of high-strength alloy steel; Anticorrosion protective layer: Wraps the outside of the prestressed carbon fiber plate, made of two-component epoxy resin, with a thickness range of 2mm to 5mm, and the tensile strength after curing is not less than 50MPa.

2. The prestressed reinforcement device for an arch bridge according to claim 1, characterized in that, The paving direction of the prestressed carbon fiber plate is consistent with the axial direction of the main arch ring of the arch bridge, and the laying angle error does not exceed ±2°.

3. The prestressed reinforcement device for an arch bridge according to claim 1, wherein, The upper anchor is located at the top or near the top of the main arch ring of the arch bridge, used to fix one end of the prestressed carbon fiber plate; The lower anchor is located at the bottom or near the bottom of the main arch ring of the arch bridge, used to fix the other end of the prestressed carbon fiber plate.

4. A prestressed reinforcement device for an arch bridge according to claim 1, characterized in that, Both the upper anchor and the lower anchor are fixed to the main arch ring of the arch bridge by bolts, and elastic washers are provided at the bolt connection parts of the upper anchor and the lower anchor.

5. A prestressed reinforcement device for an arch bridge according to claim 1, characterized in that, The hydraulic jack of the tensioning assembly is equipped with a displacement sensor and a pressure sensor, used to monitor the prestress value and displacement in real time.

6. The prestressed reinforcement device for an arch bridge according to claim 1, characterized in that, The surface of the anticorrosion protective layer is provided with anti-slip textures, and the texture depth is from 0.1mm to 0.3mm.

7. A construction method of a prestressed reinforcement device for an arch bridge as described in any one of claims 1-6, characterized in that, Including the following steps: Step S1: Clean the surface of the main arch ring of the arch bridge, remove dust, oil stains and other impurities on the surface; Use a high-pressure water jet cleaning device for cleaning, the cleaning pressure range is from 50MPa to 100MPa, and the cleaning time is not less than 10 minutes; Step S2: Install the anchoring assembly, install the upper anchor and the lower anchor on the top and bottom of the main arch ring of the arch bridge respectively, and firmly connect them to the main arch ring of the arch bridge by bolts; The bolt tightening torque range is from 200Nm to 400Nm; Step S3: Lay the prestressed carbon fiber plate, lay the prestressed carbon fiber plate along the outside of the main arch ring of the arch bridge, and ensure that the fitting error between it and the main arch ring of the arch bridge does not exceed ±1mm; Step S4: Apply prestress, apply prestress to the prestressed carbon fiber plate through the tensioning assembly, the prestress value is 70% - 80% of the ultimate tensile strength of the carbon fiber plate, and keep it constant for 30 minutes and then release the tensile force; Step S5: Install the anticorrosion protective layer, apply or wrap the anticorrosion protective layer on the outside of the prestressed carbon fiber plate, adopt the spraying process, the spraying thickness is uniform and the error does not exceed ±0.2mm; After spraying, cure at room temperature for 24 hours.

8. The construction method of a prestressed reinforcement device for an arch bridge according to claim 7, characterized in that, In step S1, during the cleaning process, the distance between the nozzle and the surface of the arch bridge needs to be kept at 10cm - 20cm.

9. The construction method of a prestressed reinforcement device for an arch bridge according to claim 7, characterized in that, In step S4, the prestress value is monitored in real time by the displacement sensor and the pressure sensor, and the error range does not exceed ±1%.

10. The construction method of a prestressed reinforcement device for an arch bridge according to claim 7, characterized in that, In step S5, after spraying, it is cured for 24 hours in an environment with a temperature of 20°C - 30°C and a humidity of 50% - 70%.

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