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CN-121992752-A - Accurate repairing method for dam cracks based on 3D printing technology

CN121992752ACN 121992752 ACN121992752 ACN 121992752ACN-121992752-A

Abstract

The invention provides a method for accurately repairing dam cracks based on a 3D printing technology, and belongs to the technical field of hydraulic engineering. Aiming at the problems of insufficient traditional repairing precision, low material combination degree and the like, the method acquires the crack data by carrying a crack scanner on a mechanical arm, takes the custom magnetic slurry, the curing agent and the magnetic photosensitive resin as printing materials, and realizes accurate repairing by means of the 3D printing on-demand forming characteristic. When the crack on water is repaired, printing a repair object slightly smaller than the crack, wrapping the repair object with magnetizing slurry rancour, filling the micro-crack with the slurry guided by a magnetic field, and stretching the 3D printing equipment with the illuminating lamp into the crack by a mechanical arm for repairing the underwater crack, and printing the underwater crack by adopting the magnetic slurry containing the underwater anti-dispersing agent in a layered manner. The magnetic field response characteristic of the magnetic slurry can accelerate solidification, improve bonding strength, realize remote operation by 3D printing, greatly improve construction efficiency and safety, and effectively solve the problem of repairing cracks of the dam in a complex environment.

Inventors

  • YANG YUNAN
  • CAO YUNFEI
  • Ma Dengshuo
  • HE YONGHAO
  • Qin Zaolifu

Assignees

  • 三峡大学

Dates

Publication Date
20260508
Application Date
20260129

Claims (10)

  1. 1. The accurate repairing method for the dam cracks based on the 3D printing technology is characterized in that when cracks appear above the upstream surface of the dam, for some cracks with regular shapes, the first 3D printing equipment (80) is utilized, and the first magnetic slurry (90), the first curing agent (120) and the first magnetic photosensitive resin (130) are used as printing materials in a material tank of the first 3D printing equipment (80) to repair the cracks (20) above the water surface, and specifically comprises the following steps: S1, arranging a mechanical arm (30) for construction on a water facing surface (10) of a dam; S2, operating the mechanical arm (30) to scan the crack (20) on the water surface by using a crack scanner (40) and transmitting the scanned crack back to the computer; S3, respectively placing a first magnetic slurry (90), a first curing agent (120) and a first magnetic photosensitive resin (130) in a material tank, printing the first magnetic slurry on a picture transmitted to a computer through a crack scanner (40) by using a first 3D printing device (80), and printing a restoration (50) smaller than the external dimension of a crack (20) on the water surface; S4, wrapping the outer surface of the restoration (50) with slurry (60), magnetizing the restoration, and then loading the restoration into the crack (20) on the water surface by using a mechanical arm (30) to finish restoration; and S5, cleaning the surface of the repaired water surface crack (20).
  2. 2. The method for accurately repairing dam cracks based on the 3D printing technology according to claim 1, wherein in the step S1, the mechanical arm (30) is set according to the situation; and (3) between the steps S1 and S2, cleaning up sundries in the cracks (20) on the water surface by adopting a high-pressure water gun, and scanning images transmitted to a computer through a crack scanner (40) to observe whether the sundries remain.
  3. 3. The method for accurately repairing dam cracks based on the 3D printing technology according to claim 1, wherein the first magnetic slurry (90) adopts a formula of 1.5-3.5% of flocculant, 12-20% of quick-setting dry material, 0.4-2% of water reducer, 0.35-0.5% of water gel ratio, 20-40% of magnetic powder, 0.15-0.3% of cellulose ether and 1-5% of epoxy resin.
  4. 4. The method for accurately repairing dam cracks based on the 3D printing technology according to claim 1, wherein in step S3, in order to match the curing time of the first magnetic slurry (90), the 3D printing should be performed in a layered manner, and the extrusion mixing curing time of the first magnetic slurry (90), the first curing agent (120) and the first magnetic photosensitive resin (130) by the first 3D printing device (80) is 30S-50S.
  5. 5. The method for accurately repairing dam cracks based on the 3D printing technology according to claim 1, wherein in the step S3, the content of magnetic powder in the first magnetic photosensitive resin (130) is 10% -20%, and the content of the photosensitive resin is 80% -90%.
  6. 6. The method for accurately repairing dam cracks based on the 3D printing technology according to claim 1, wherein in the step S4, the concrete formulation and the proportion of the slurry (60) wrapped around the printed repair object (50) are the same as those of the first magnetic slurry (90), and the first curing agent (120) is added.
  7. 7. The accurate repairing method for the dam cracks based on the 3D printing technology is characterized in that when cracks appear below the upstream surface of the dam, aiming at some subsurface cracks (70) with regular shapes, a mechanical arm (30) is used for stretching a second 3D printing device (100) into the cracks, and the second magnetic slurry (110), a first curing agent (120) and a first magnetic photosensitive resin (130) are used as printing materials in a material tank of the second 3D printing device (100) for repairing the subsurface cracks (70), and specifically comprises the following steps: a1, arranging a mechanical arm (30) for construction on the upstream surface (10) of the dam. A2, the mechanical arm (30) is operated to scan the subsurface fracture (70) by the fracture scanner (40) and transmit the scanned subsurface fracture back to the computer; A3, respectively placing second magnetic slurry (110), a first curing agent (120) and first magnetic photosensitive resin (130) in a material tank of the second 3D printing equipment (100), arranging an illuminating lamp (140) at the side of a spray head of the second 3D printing equipment (100), and printing and repairing the underwater cracks (70) by using a mechanical arm (30) to enable the second 3D printing equipment (100) to extend into the underwater cracks (70).
  8. 8. The method for accurately repairing dam cracks based on the 3D printing technology according to claim 7, wherein in the step A3, the second magnetic slurry (110) adopts a formula of flocculant, quick setting dry material, water reducing agent, water gel ratio, magnetic powder, cellulose ether, epoxy resin and underwater anti-dispersant, and the specific mass ratio of the flocculant is 1.5% -3.5%, the quick setting dry material is 12% -20%, the water reducing agent is 0.4% -2%, the water gel ratio is 0.35-0.5, the magnetic powder is 20% -40%, the cellulose ether is 0.15% -0.3%, the epoxy resin is 1% -5%, and the underwater anti-dispersant is 2% -3.5%.
  9. 9. The method for accurately repairing dam cracks based on the 3D printing technology according to claim 7, wherein in the step A3, in order to match the curing time of the second magnetic slurry (110), the 3D printing should be performed in a layered manner, and the extrusion mixing curing time of the second magnetic slurry (110), the first curing agent (120) and the first magnetic photosensitive resin (130) by the second 3D printing device (100) is 20s-40s.
  10. 10. The method for accurately repairing dam cracks based on the 3D printing technology according to claim 7, wherein in the step A3, when the second 3D printing device (100) repairs the cracks (70) under the water surface by printing under water, the lighting lamp (140) is turned on; In step A3, when the second 3D printing device (100) is extended into the underwater subsurface fracture (70) by using the mechanical arm (30) to print and repair the subsurface fracture (70), the mechanical arm (30) and the second 3D printing device (100) should be operated remotely to repair the subsurface fracture (70) in cooperation.

Description

Accurate repairing method for dam cracks based on 3D printing technology Technical Field The invention relates to the technical field of hydraulic engineering, in particular to a method for accurately repairing dam cracks based on a 3D printing technology. Background The traditional dam crack is repaired by adopting modes such as manual filling or common concrete pouring, and the like, so that the problems of insufficient repair precision, low combination degree of materials and original dam bodies, limited construction efficiency and the like exist, and particularly under complex crack forms or underwater environments, accurate plugging and long-acting reinforcement of cracks are difficult to realize, hidden troubles such as leakage, crack expansion and the like are easily caused again after repair, and the safety and the operation stability of a dam structure are threatened. Disclosure of Invention The invention aims to overcome the defects, and provides a method for accurately repairing dam cracks based on a 3D printing technology, so as to solve the problems of uncontrollable fluidity, long curing time, weak bonding between new and old materials and the like in the conventional cement grouting method, and particularly has poor effect on underwater cracks. In order to achieve the aim, the technical scheme adopted by the invention is that when the dam cracks appear above the upstream surface of the dam based on the 3D printing technology, the first 3D printing equipment is utilized and the first magnetic slurry, the first curing agent and the first magnetic photosensitive resin are used as printing materials in a material tank of the first 3D printing equipment to repair the cracks above the water surface aiming at some cracks with regular shapes, and the method specifically comprises the following steps: S1, arranging a mechanical arm used for construction on the upstream surface of a dam; s2, controlling the mechanical arm to scan cracks on the water surface by using a crack scanner and transmitting the cracks back to the computer; s3, respectively placing first magnetic slurry, a first curing agent and first magnetic photosensitive resin in a material tank, printing the first magnetic slurry, the first curing agent and the first magnetic photosensitive resin by using first 3D printing equipment through a picture transmitted to a computer by a crack scanner, and printing a restoration smaller than the outline dimension of a crack on the water surface; S4, coating the outer surface of the restoration with slurry, magnetizing the restoration, and then loading the restoration into a crack on the water surface by using a mechanical arm to finish restoration; And S5, cleaning the surface of the repaired water surface crack. Preferably, in step S1, the mechanical arm is set according to the situation; and step S1 and step S2, cleaning up sundries in cracks on the water surface by adopting a high-pressure water gun, and scanning images transmitted to a computer through a crack scanner to observe whether sundries remain. Preferably, the first magnetic slurry adopts a formula comprising 1.5 to 3.5 percent of flocculant, 12 to 20 percent of quick-setting dry material, 0.4 to 2 percent of water reducer, 0.35 to 0.5 percent of water-gel ratio, 20 to 40 percent of magnetic powder, 0.15 to 0.3 percent of cellulose ether and 1 to 5 percent of epoxy resin in parts by mass. Preferably, in step S3, in order to match the curing time of the first magnetic slurry, the 3D printing should be performed in a layered manner, and the first magnetic slurry, the first curing agent and the first magnetic photosensitive resin are extruded from the first 3D printing device for a mixed curing time of 30S to 50S. Preferably, in step S3, the first magnetic photosensitive resin used has a magnetic powder content of 10% to 20% and a photosensitive resin content of 80% to 90%. Preferably, in step S4, the specific formulation and the proportion of the slurry wrapped around the printed prosthesis are the same as those of the first magnetic slurry, and the first curing agent is added. The accurate repairing method for the dam cracks based on the 3D printing technology comprises the following steps of stretching second 3D printing equipment into the cracks by using a mechanical arm and repairing the cracks under the water by using second magnetic slurry, a first curing agent and first magnetic photosensitive resin as printing materials in a material tank of the second 3D printing equipment aiming at the cracks under the water with regular shapes when the cracks appear under the water surface of the upstream surface of the dam: a1, arranging a mechanical arm used for construction on the upstream surface of the dam. A2, operating the mechanical arm to scan the underwater cracks by using a crack scanner and transmitting the underwater cracks back to the computer; And A3, respectively placing second magnetic slurry, a first curing agent and first m