CN113026837A - Restoration, reinforcement and anticorrosion construction method for port RC pile foundation in alpine region - Google Patents

Restoration, reinforcement and anticorrosion construction method for port RC pile foundation in alpine region Download PDF

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Publication number
CN113026837A
CN113026837A CN202110296251.9A CN202110296251A CN113026837A CN 113026837 A CN113026837 A CN 113026837A CN 202110296251 A CN202110296251 A CN 202110296251A CN 113026837 A CN113026837 A CN 113026837A
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China
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pile
corrosion
port
combined die
die
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Chinese (zh)
Inventor
唐亮
程志和
丛晟亦
凌贤长
刑文强
李新宇
南嘉明
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D37/00Repair of damaged foundations or foundation structures
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/06Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/64Repairing piles

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

A construction method for repairing, reinforcing and preventing corrosion of a port RC pile foundation in a high and cold area relates to a pile foundation repairing and preventing corrosion. Arranging and binding and fixing FRP grid ribs at the damaged position of the RC pile; sleeving two semicircular protective walls of a sealed combined die outside the damaged part of the RC pile, connecting and fixing the two semicircular protective walls through a plurality of corrosion-resistant screws, installing the underwater robot on a guide rail before fixing, and then sealing by using HY-137 glue; starting a water pump to discharge seawater in the sealed combined die, then controlling an underwater robot to spray polymer cement mortar around the RC pile, and then spraying a silane impregnant on the surface of the polymer cement mortar; and finally, detaching the sealed combined die and then transferring the sealed combined die together with the underwater robot. The method can carry out repair reinforcement and anticorrosion construction on the locally damaged RC pile foundation underwater, and greatly improves the durability, bearing capacity and corrosion resistance of the pile body.

Description

Restoration, reinforcement and anticorrosion construction method for port RC pile foundation in alpine region
Technical Field
The invention relates to a pile foundation repairing and corrosion preventing method, in particular to a method for repairing, reinforcing and corrosion preventing construction of a port RC pile foundation in a high and cold area, and belongs to the technical field of ocean and port engineering pile foundation repairing.
Background
The ocean shipping pattern of the world is changed along with the road opening of the arctic channel and the offshore silk, the arctic channel becomes a new gold channel and a strategic guarantee channel, and the demand of ocean engineering infrastructures such as a seaport, a cross-sea bridge and a drilling platform along the line is increased. The problems of freezing damage, cracks and corrosion of the port RC pile foundation caused by multi-field coupling action of ocean and severe cold environment are not solved for a long time, and the number of the RC pile foundations damaged by seawater corrosion is huge every year, so that serious loss is caused.
At present, the main anti-corrosion measure of the RC pile foundation in the high and cold areas in seawater is coating protection, the RC pile foundation has certain anti-corrosion capability and durability, and the RC pile foundation is widely applied to port engineering in countries such as Japan, Korea and the like. The service cycle of the anticorrosive coating in a seawater environment is 1-3 years, the coating protection is easy to cause local failure in one year, and the cycle is short. After the reinforced concrete is corroded and damaged in seawater, the repairing work difficulty is high, the conventional underwater concrete is suitable for integral casting and forming of large-volume pile foundations, the problems of poor bonding capability of new and old concrete, poor casting quality and the like exist, meanwhile, the concrete casting construction needs to overcome the low-temperature condition to guarantee the concrete hydration process in a cold environment, the temperature stress cracking caused by hydration heat of the concrete is also prevented, therefore, the local effective repairing and reinforcing are difficult to realize, and a proper material is also lacked to replace a steel bar material corroded in an original pile foundation. When the steel plate is used for repairing, only a temporary effect is achieved, the corrosion speed of the pile body is delayed, and the improvement influence on the strength and durability of the pile body is small. In actual engineering, local repairing, reinforcing and corrosion preventing treatment on underwater damaged RC pile foundations is lacked by related equipment and technologies, and repairing, reinforcing and corrosion preventing of the RC pile foundations (including piers) of ports which are built or to be built along the line become problems which need to be solved urgently.
In view of this, it is necessary to provide a method for repairing, reinforcing and corrosion-preventing the RC pile foundation of the port in the alpine region, so as to effectively solve the problem that the RC pile foundation of the port in the alpine region faces in the repairing and reinforcing process, which has important engineering and strategic meanings for accelerating the construction of ports and wharfs along the north waterway and the offshore silk route.
Disclosure of Invention
In order to overcome the defects in the background art, the invention provides a method for repairing, reinforcing and anti-corrosion construction of a port RC pile foundation in a high and cold area, which can carry out repairing, reinforcing and anti-corrosion construction on a locally damaged RC pile foundation underwater, and greatly improve the durability, bearing capacity and anti-corrosion performance of a pile body.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for repairing, reinforcing and preventing corrosion of a port RC pile foundation in a high and cold area needs to use a material unit, a mould unit, a control unit and a drainage unit;
the material unit comprises FRP grid ribs, polymer cement mortar and silane impregnant, the die unit comprises a sealing combined die and a plurality of corrosion-resistant screws, the sealing combined die is in a cylindrical shape formed by butting two semicircular guard walls, a silicon rubber strip is filled between the butting ends at the two sides of the two semicircular guard walls, the two semicircular guard walls are connected and fixed through the corrosion-resistant screws, semi-annular silicon rubber rings are respectively and fixedly bonded on the upper end port and the lower end port of the die at the upper end and the lower end of the sealing combined die in advance, the upper end port and the lower end port of the die are respectively in contact with an RC pile after being connected and fixed, the control unit comprises a computer, a microcomputer control material storage tank, a guide rail and an underwater robot, the microcomputer control material storage tank is provided with two small tank bodies for storing the polymer cement mortar and the silane impregnant, and a grouting guide pipe and a coating guide pipe are, the two small tanks are respectively matched with a compressor which can supply pressure to the respective inner parts through the control of the computer, the grouting guide pipe and the coating guide pipe are inserted into a sealing combined die and are sealed, the free ends of the grouting guide pipe and the coating guide pipe are provided with spray heads and fixed on an underwater robot, the guide rail comprises two split bodies and is respectively fixed on the inner sides of two semicircular guard walls of the sealing combined die, the sealing combined die is connected and fixed with the two split bodies of the guide rail and spirally assembled around an RC pile, the underwater robot can move along the guide rail and is provided with a camera for real-time display through the computer, the drainage unit comprises an anti-corrosion and anti-freezing hose, a water pump and a water suction end, the water suction end on the die is fixed with the water suction end and is sealed, and the water suction end of the water pump is connected with, the other end of the anti-corrosion and anti-freezing hose is connected with the upper end of the water absorption end;
the construction method comprises the following steps:
the method comprises the following steps: arranging and binding and fixing the FRP grid ribs at the potential RC pile damaged part by combining the lifting equipment with manpower;
step two: then, combining lifting equipment with manual submergence, sleeving two semicircular guard walls of the sealed combined die outside the damaged position of the RC pile, connecting and fixing the two semicircular guard walls through a plurality of corrosion-resistant screws, observing that the guide rail is well assembled before fixing, installing an underwater robot on the guide rail, and then sealing the butt joint positions of the two sides of the sealed combined die, the butt joint positions of the upper and lower semi-annular silicon rubber rings and the connecting positions of the upper and lower ends and the RC pile by using HY-137 glue to form a sealed space structure between the sealed combined die and the RC pile;
step three: starting a water pump to discharge seawater in the sealed combined die through a water suction end, then supplying pressure to a small tank body of a microcomputer control material storage tank for storing polymer cement mortar through a computer control compressor, simultaneously controlling an underwater robot to move up and down along a guide rail, spraying the polymer cement mortar conveyed under pressure around an RC pile, after the polymer cement mortar is integrated with original concrete of the RC pile, supplying pressure to the small tank body of the microcomputer control material storage tank for storing silane impregnant through the computer control compressor, simultaneously controlling the underwater robot to move up and down along the guide rail, spraying the silane impregnant conveyed under pressure on the surface of the polymer cement mortar to form a waterproof coating, and displaying a control spraying area on the computer in real time by combining the operation with a camera on the underwater robot;
step four: and finally, the sealing combined die is disassembled by combining lifting equipment and manual submergence, and then the sealing combined die is transferred together with an underwater robot.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the RC pile foundation to be repaired is wrapped around the sealing combined die in a sealing manner to form a sealing space structure, then water is discharged through the water pump to create an anhydrous environment for the underwater robot in the sealing combined die to spray grouting materials and anticorrosive coatings, so that mortar and coatings can be conveniently and rapidly solidified, the repairing quality and durability are ensured, the underwater robot is controlled by a computer to move on the guide rail in the sealing combined die and simultaneously carry out spraying operation, related operations can be remotely controlled on an offshore platform or a port and pier, the intelligent degree is high, the limitation by environmental conditions is small, the repairing, reinforcing and anticorrosive construction can be carried out on the locally damaged RC pile foundation underwater, the durability, the bearing capacity and the corrosion resistance of the pile body are greatly improved, and the repairing quality is high.
Drawings
FIG. 1 is a schematic view of the construction structure of the present invention;
FIG. 2 is a schematic view of the internal structure of the split mold of the present invention.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 1 to 2, a construction method for repairing, reinforcing and preventing corrosion of an RC pile foundation of a port in a alpine region requires the use of a material unit, a mold unit, a control unit and a drainage unit;
the material unit comprises FRP grid ribs 2, polymer cement mortar 3 and a silane impregnant 4, wherein the FRP grid ribs 2 are used as a repair framework, the polymer cement mortar 3 is used as a grouting material, and the silane impregnant 4 is used as an anticorrosive coating;
the mould unit comprises a sealing combined mould 8, a corrosion-resistant screw 9, a lower mould port 18 and an upper mould port 19, wherein the sealing combined mould 8 is formed by butting two semicircular protective walls into a cylinder shape, the butting ends of the two sides of the two semicircular protective walls are respectively provided with a plurality of through holes in a corresponding mode, a silicon rubber strip is filled between the butting ends of the two sides of the two semicircular protective walls, the thickness of the silicon rubber strip is preferably 0.5cm, the silicon rubber strip can be bonded and fixed on the two sides of one semicircular protective wall in advance for convenience of installation, the sealing combined mould 8 is fixedly connected with the two semicircular protective walls through the corrosion-resistant screws 9, the upper mould port 19 and the lower mould port 18 are respectively arranged at the upper end and the lower end of the sealing combined mould 8, the upper mould port 19 and the lower mould port 18 are respectively bonded and fixed with a semi-annular silicon rubber ring 20 with good flexibility and corrosion resistance in advance, and the upper mould port 19 and the lower mould port The ring is in good contact with the RC pile 1;
the control unit comprises a computer 12, a microcomputer control material storage tank 13, a guide rail 15 and an underwater robot 16, wherein the microcomputer control material storage tank 13 is provided with two small tank bodies which are respectively used for storing polymer cement mortar 3 and silane impregnant 4, the two small tank bodies are respectively matched with a compressor which can control the compressor to supply pressure to the respective interiors through the computer 12, a grouting guide pipe 14 is led out of the small tank body for storing the polymer cement mortar 3, a coating guide pipe 11 is led out of the small tank body for storing the silane impregnant 4, a guide pipe port 10 is arranged at an upper port 19 of the mold, the guide pipe port 10 is used for allowing the grouting guide pipe 14 and the coating guide pipe 11 to penetrate through and be inserted into the sealed combined mold 8, the connecting positions of the grouting guide pipe 14 and the coating guide pipe 11 and the upper port 19 of the mold are sealed, and spray heads are arranged at the free ends of the grouting guide pipe 14 and the coating guide pipe 11 and, the guide rail 15 comprises two split bodies and is respectively fixed on the inner sides of two semicircular guard walls of the sealing combined die 8, the sealing combined die 8 is connected and fixed with the two split bodies of the guide rail 15 and assembled into a spiral shape to surround the RC pile 1, the underwater robot 16 can move along the guide rail 15 and is provided with a camera which can display in real time through the computer 12, and the underwater robot can adopt the scheme of the utility model patent of the submarine pipeline detection underwater robot, which is the prior art, also can adopt the granted announcement date of 2021 year 02 and 05 days, the publication number CN212473864U and the name of the patent;
the water discharging unit comprises an anti-corrosion anti-freezing hose 5, a water pump 6 and a water absorbing end head 17, wherein a water outlet port 7 is further formed in an upper port 19 of the mold, the water absorbing end head 17 is fixed at the position of the water outlet port 7, the connecting position of the water absorbing end head 17 and the upper port 19 of the mold is sealed, the lower end of the water absorbing end head 17 is close to a lower port 18 of the mold so as to fully discharge seawater in the sealed combined mold 8, the water pumping end of the water pump 6 is connected with one end of the anti-corrosion anti-freezing hose 5, and the other end of the anti-corrosion anti-freezing hose 5 is connected with;
the construction method comprises the following steps:
the method comprises the following steps: arranging and binding and fixing FRP grid ribs 2 at the damaged part of the potential RC pile 1 by combining the lifting equipment with manpower;
step two: then, combining lifting equipment with manual submergence, sleeving two semicircular guard walls of the sealed combined die 8 outside the damaged part of the RC pile 1, connecting and fixing the two semicircular guard walls through a plurality of corrosion-resistant screws 9, observing that the guide rail 15 is well assembled before fixing, installing an underwater robot 16 on the guide rail 15, and sealing the butt joint positions of the two sides of the sealed combined die 8, the butt joint positions of the upper and lower ends of the semicircular silicon rubber rings 20 and the connecting positions of the upper and lower ends of the semicircular silicon rubber rings and the RC pile 1 by using HY-137 glue to form a sealed space structure between the sealed combined die 8 and the RC pile 1;
step three: the water pump 6 is started to discharge seawater in the sealed combined die 8 through the water absorption end 17, a waterless space is provided for the spraying operation of the polymer cement mortar 3 and the silane impregnant 4, the polymer cement mortar is better solidified, then the computer 12 controls the compressor to supply pressure to the small tank body of the microcomputer control material storage tank 13 for storing the polymer cement mortar 3, the underwater robot 16 is controlled to move up and down along the guide rail 15, the polymer cement mortar 3 conveyed under pressure is sprayed around the RC pile 1, the spraying amount of the polymer cement mortar 3 covers the FRP grid rib 2 and is thickened by 3-6 mm, after the polymer cement mortar is integrated with the original concrete of the RC pile 1, the computer 12 controls the compressor to supply pressure to the small tank body of the microcomputer control material storage tank 13 for storing the silane impregnant 4, the underwater robot 16 is controlled to move up and down along the guide rail 15 at the same time, the silane impregnant 4 conveyed under pressure is sprayed on the surface of the polymer cement mortar 3 to form a waterproof coating, the above operation is combined with the real-time display of the camera on the underwater robot 16 on the computer 12, so as to better control the spraying area;
step four: and finally, the sealing combined die 8 is disassembled by combining lifting equipment and manual submerging and then is transferred together with the underwater robot 16.
The construction method solves the problems of local repair, reinforcement and anticorrosion treatment of corroded RC pile foundations in seawater and severe cold environments, can carry out regional construction, reinforcement and anticorrosion on the RC piles 1 at any time point, avoids the problem of large-volume integral pouring of underwater concrete or poor adhesion of new and old concrete, and effectively solves the problems of low strength and poor corrosion resistance of corrosion damage reinforcing steel bars in the original concrete, and the sealing combined die 8 can carry out the injection of polymer cement mortar 3 and silane impregnant 4 in an anhydrous closed environment, so that the better combination can be realized, the bonding force is good, and the corrosion resistance and durability of the RC piles 1 are greatly improved;
three novel materials, namely FRP grid rib 2, polymer cement mortar 3 and silane impregnant 4, are introduced to be applied to local repair reinforcement and anticorrosion work of RC pile foundation in seawater environment of high and cold regions, firstly, the FRP grid rib 2 soaks high-performance continuous fibers such as carbon fibers, glass fibers and the like in resin with good corrosion resistance to form an integral grid, the integral grid has good tensile strength and corrosion resistance, the integral bearing capacity, rigidity and crack resistance of concrete are greatly improved, meanwhile, the integral grid is light and high in strength, the material bonding force is high, damaged reinforcing steel bars in original concrete can be fully replaced, secondly, the polymer cement mortar 3 not only serves as bonding mortar of the FRP grid rib 2 and the RC pile 1, but also serves as a concrete repair material of the surface layer of the RC pile 1, and the polymer cement mortar 3 has the characteristics of no separation under water, self compactness, frost resistance, low bleeding property and the like, the fiber of the FRP grid rib 2 can be reliably connected with the original concrete of the RC pile 1 and is in deformation coordination with the original concrete, the bearing capacity and durability requirements are met, finally, the silane impregnant 4 is sprayed after pouring is completed, the silane impregnant 4 forms a firm hydrophobic organic silicon network protective layer on the surface of the capillary hole of the polymer cement mortar 3, invasion of external moisture and harmful substances is prevented, meanwhile, internal moisture and harmful gas overflow, and the waterproofness and corrosion resistance are greatly improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (3)

1. A method for repairing, reinforcing and anticorrosion construction of a port RC pile foundation in a alpine region is characterized by comprising the following steps: the construction method requires the use of a material unit, a die unit, a control unit, and a drainage unit;
the material unit comprises FRP grid ribs (2), polymer cement mortar (3) and silane impregnant (4), the die unit comprises a sealing combined die (8) and a plurality of corrosion-resistant screws (9), the sealing combined die (8) is in a cylindrical shape formed by butting two semicircular guard walls, a silicon rubber strip is filled between the butting ends of the two sides of the two semicircular guard walls, the two semicircular guard walls are connected and fixed through the corrosion-resistant screws (9), an upper die port (19) and a lower die port (18) at the upper end and the lower end of the sealing combined die (8) are respectively bonded and fixed with a semicircular silicon rubber ring (20) in advance, the upper die port and the lower die port are respectively bonded and fixed with a semicircular silicon rubber ring (20) in advance and are respectively butted into a complete rubber ring to be contacted with an RC pile (1) after being connected and fixed, the control unit comprises a computer (12), a microcomputer control material storage tank (13), a, the storage tank (13) for the microcomputer-controlled material is provided with two small tanks for storing the polymer cement mortar (3) and the silane impregnant (4), a grouting guide pipe (14) and a coating guide pipe (11) are respectively led out, the two small tanks are respectively matched with a compressor which can supply pressure to the respective interiors under the control of the computer (12), the grouting guide pipe (14) and the coating guide pipe (11) are inserted into a sealing combined die (8) and are sealed, free ends of the grouting guide pipe (14) and the coating guide pipe (11) are provided with spray heads and are fixed on an underwater robot (16), the guide rail (15) comprises two split bodies and is respectively fixed on the inner sides of two semicircular guard walls of the sealing combined die (8), and the two split bodies of the guide rail (15) are assembled into a spiral shape and are wound around an RC pile (1) after the sealing combined die (8) is connected and fixed, the underwater robot (16) can move along a guide rail (15) and is provided with a camera for real-time display through a computer (12), the drainage unit comprises an anti-corrosion and anti-freezing hose (5), a water pump (6) and a water absorption end (17), the water absorption end (17) is fixed by an upper port (19) of the mold and is sealed, the water pumping end of the water pump (6) is connected with one end of the anti-corrosion and anti-freezing hose (5), and the other end of the anti-corrosion and anti-freezing hose (5) is connected with the upper end of the water absorption end (17);
the construction method comprises the following steps:
the method comprises the following steps: arranging and binding and fixing the FRP grid ribs (2) at the damaged part of the potential RC pile (1) by combining the lifting equipment with manpower;
step two: then, combining lifting equipment with manual submergence, sleeving two semicircular guard walls of a sealed combined die (8) outside a damaged part of the RC pile (1), connecting and fixing the two semicircular guard walls through a plurality of corrosion-resistant screws (9), observing that the guide rail (15) is well assembled before fixing, installing an underwater robot (16) on the guide rail (15), and sealing the butt joint positions of the two sides of the sealed combined die (8), the butt joint positions of the upper and lower semi-annular silicon rubber rings (20) and the connecting positions of the upper and lower ends and the RC pile (1) by using HY-137 glue to form a sealed space structure between the sealed combined die (8) and the RC pile (1);
step three: starting a water pump (6), discharging seawater in a sealed combined die (8) through a water absorption end head (17), controlling a compressor to supply pressure to a small tank body storing polymer cement mortar (3) in a microcomputer control material storage tank (13) through a computer (12), simultaneously controlling an underwater robot (16) to move up and down along a guide rail (15), spraying the polymer cement mortar (3) conveyed under pressure around an RC pile (1), after the polymer cement mortar is integrated with original concrete of the RC pile (1), controlling the compressor to supply pressure to the small tank body storing a silane impregnant (4) in the microcomputer control material storage tank (13) through the computer (12), simultaneously controlling the underwater robot (16) to move up and down along the guide rail (15), spraying the silane impregnant (4) conveyed under pressure on the surface of the polymer cement mortar (3) to form a waterproof coating, and displaying and controlling the camera on the computer (12) in real time in combination with the operation, wherein the camera on the underwater robot (16) is combined to control the computer (12) A spray zone;
step four: and finally, the sealing combined die (8) is disassembled by combining lifting equipment with manual submergence and then transferred together with an underwater robot (16).
2. The method for repairing, reinforcing and anti-corrosion construction of the RC pile foundation of the port in the alpine region according to claim 1, characterized in that: the thickness of the silicon rubber strip is 0.5cm and is adhered and fixed on two sides of a semicircular guard wall of the sealing combined die (8) in advance.
3. The method for repairing, reinforcing and anti-corrosion construction of the RC pile foundation of the port in the alpine region according to claim 1, characterized in that: and in the third step, the injection amount of the polymer cement mortar (3) is to cover the FRP grid rib (2) and thicken 3-6 mm.
CN202110296251.9A 2021-03-19 2021-03-19 Restoration, reinforcement and anticorrosion construction method for port RC pile foundation in alpine region Pending CN113026837A (en)

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CN202110296251.9A CN113026837A (en) 2021-03-19 2021-03-19 Restoration, reinforcement and anticorrosion construction method for port RC pile foundation in alpine region

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CN202110296251.9A CN113026837A (en) 2021-03-19 2021-03-19 Restoration, reinforcement and anticorrosion construction method for port RC pile foundation in alpine region

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