A method for reinforcing a building structure with a nuclear power cold source system

Abstract

The application provides a method for reinforcing a building structure in a nuclear power cold source system, and belongs to the technical field of ocean engineering management. The method comprises the following steps: early on-site measurement, preparation of underwater non-segregation grouting material, prefabrication of a three-proofing composite plate, construction of an offshore operation working platform, base surface treatment, installation of the three-proofing composite plate, configuration of the underwater non-segregation grouting material, grouting of the underwater non-segregation grouting material, top sealing and surface cleaning. The three-proofing composite plate composed of an electrostatic prevention chemical insulation plate, an alloy plate for preventing electric conduction and an alloy plate for preventing marine organism adhesion is arranged outside the pier column, and the underwater non-segregation grouting material is used as a connecting material between the building structure in seawater and the three-proofing composite plate, so that marine organism adhesion corrosion does not occur on the surface of the building structure in seawater, electrochemical corrosion between the building structure and metal components is prevented, and the damage of seawater corrosion to the building and structure is effectively prevented.

Description

Technical Field

[0001] This invention relates to the field of marine engineering management technology, and in particular to a method for reinforcing the structure of a building in a nuclear power plant cold source system. Background Technology

[0002] In nuclear power plant cold source systems, the safety of the cold source water intake is extremely important. The seawater intake structure platform includes reinforced concrete or steel structures. Marine organism attachment corrosion, electrochemical corrosion, and seawater corrosion are three common and widespread phenomena in marine engineering. Electrochemical corrosion occurs when different metals react with each other, damaging concrete structures, steel structures, and metal connectors. Acidic mucus secreted by marine organisms adheres to concrete surfaces and metal components, corroding them and severely impacting the technical specifications, expected lifespan, durability, stability, and safety of buildings and structures. This damage can severely damage the entire seawater structure platform under the impact of hurricanes, seawater, and other loads, even leading to platform collapse and directly affecting the safety of the nuclear power plant's cold source water intake. Summary of the Invention

[0003] In view of this, in order to overcome the shortcomings of the above-mentioned background technology, the present invention provides a method for reinforcing the building structure in a nuclear power cold source system. This method uses a three-proof composite plate, consisting of an anti-static and anti-conductive chemical insulation board and an alloy plate that prevents marine organism adhesion, to surround the building structure in seawater. Underwater non-segregating grout is used as the connecting material between the building structure in seawater and the three-proof composite plate. This method can prevent marine organism adhesion corrosion from occurring on the structural surface, ensure that electrochemical corrosion does not occur between the structure and the metal components, and effectively prevent seawater corrosion from damaging the building and structure.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A method for reinforcing building structures in nuclear power plant cold source systems includes the following steps:

[0006] Step S1: Preliminary on-site measurement

[0007] Before commencing construction, the installation location of the three-proof composite reinforcement system was confirmed on-site, and the specifications and dimensions were determined by measuring the actual dimensions. The system was then positioned on the surface of the building structure in the seawater. The three-proof composite reinforcement system consists of an inner layer of underwater non-segregating grout; a middle layer of anti-static and anti-conductivity chemical insulation board; and an outer layer of alloy plate to prevent marine organism attachment.

[0008] Step S2: Prepare underwater non-segregating grout.

[0009] Underwater non-segregating grout is used as a connection material between the building structure and the three-proof composite panel in seawater.

[0010] Step S3: Prefabricated three-proof composite panel

[0011] Use an electric drill to drill holes in the surface of the three-proof composite board, and use copper wire to fix the binding straps to the three-proof composite board.

[0012] Step S4: Construct an offshore work platform

[0013] Step S5, Base Surface Treatment

[0014] Remove contaminants from the surface of the building structure in seawater and roughen the surface of the building structure in seawater;

[0015] Step S6: Install the three-proof composite panel

[0016] 1) Drill holes on both sides of the building structure above the seawater and install hooks to suspend tension adjusters;

[0017] 2) Transport the three-proof composite panels to the construction site via an offshore work platform and erect the three-proof composite panels;

[0018] 3) Connect the two ends of the three pre-fixed binding straps and tighten them initially so that the three-proof composite board surrounds the building structure in the seawater; one end of the three-proof composite board has a pre-made slot, insert the other end into the slot, and tighten the binding straps again; adjust the horizontal and vertical position of the three-proof composite board, and after it reaches the design position, tighten the binding straps.

[0019] 4) Lower the three-proof composite board to the designated position and ensure its balance. Then install the three-proof composite board in the designated position and align it. Then use the strapping device to tie the three-proof composite board to the building structure in the seawater so that it is tightly connected to the building structure in the seawater.

[0020] 5) After all the three-proof composite panels are installed and tightened, use three-proof expansion bolts to connect and fix them at the vertical overlap positions and the overlap positions of the upper and lower three-proof composite panels.

[0021] Step S7: Prepare underwater non-segregation grouting material

[0022] Step S8: Inject underwater non-segregating grout.

[0023] Step S9, Top Sealing

[0024] After the grout has initially cured, apply the sealing adhesive evenly to the top of the three-proof composite board to seal the top.

[0025] Step S10, Surface Cleaning

[0026] After all construction is completed, clean up any excess slurry or construction residue on the surface of the three-proof composite board to ensure a clean surface.

[0027] Preferably, the chemical insulating board and the alloy plate are bonded and fixed together by epoxy resin adhesive.

[0028] Preferably, after step S5 and before step S6, the method further includes:

[0029] Step S51: Lay out ultra-high molecular weight polyethylene mesh fabric

[0030] After the base surface is treated, ultra-high molecular weight polyethylene mesh is evenly laid out at the locations where the three-proof composite panels need to be installed in the seawater building structure.

[0031] Preferably, in step S6, 5), the overlap length of the upper and lower three-proof composite panels is 100-200mm.

[0032] Preferably, in step S6, step 5), three-proof expansion bolts are installed with a standard of 100-150mm, and the bolts are fixed vertically in a staggered manner.

[0033] Preferably, step S8, injecting underwater non-segregating grout, specifically involves:

[0034] 11) Use low-pressure injection grouting method, which is divided into two grouting sessions. First, grout the bottom, with a grouting height of 100-150mm.

[0035] 22) After the grout has initially solidified, continue to inject the remaining grout.

[0036] Preferably, in step 11), if leakage occurs during bottom sealing, the flexible mold is repaired in time, and a second bottom sealing is performed until no leakage occurs.

[0037] Preferably, in step 22), if two pieces of three-proof composite board overlap, after sealing the bottom, it is necessary to inject the filler in two stages. The first stage is injected to the overlap position, and after initial curing, the second stage is injected to the top.

[0038] Preferably, the lap joint is sealed with sealing adhesive before grouting.

[0039] Preferably, the thickness of the three-proof composite board is 0.1-3mm.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The present invention provides a method for reinforcing building structures in nuclear power cold source systems. This method involves enclosing the building structure in seawater with a three-proof composite plate, which consists of a chemically insulating plate that prevents static electricity and electrical conduction, and an alloy plate that prevents marine organism adhesion. Underwater non-segregating grout is used as the connecting material between the building structure in seawater and the three-proof composite plate. This method prevents marine organism adhesion corrosion from occurring on the surface of the building structure in seawater, ensures that electrochemical corrosion does not occur between the structure and metal components, and effectively prevents seawater corrosion from damaging buildings and structures. Detailed Implementation

[0042] This invention provides a method for reinforcing building structures in nuclear power plant cold source systems, comprising the following steps:

[0043] Step S1: Preliminary on-site measurement

[0044] Before commencing construction, the installation location of the three-proof composite reinforcement system was confirmed on-site, and the specifications and dimensions were determined by measuring the actual dimensions. The system was then positioned on the surface of the building structure in the seawater. The three-proof composite reinforcement system consists of an inner layer of underwater non-segregating grout; a middle layer of anti-static and anti-conductivity chemical insulation board; and an outer layer of alloy plate to prevent marine organism attachment.

[0045] Specifically, the preferred option is:

[0046] Before commencing construction, the installation location of the three-proof reinforcement system was confirmed on-site based on the drawings, design institute, and owner's requirements. Measurements were taken on-site to determine the specifications and dimensions, and the system was positioned on the surface of the building structure in seawater. Prefabricated three-proof composite panels were then produced. The preferred three-proof composite reinforcement system consists of: an inner layer of underwater non-segregating grout; and a middle layer of anti-static, anti-conductive chemical insulation board and anti-marine organism adhesion alloy plate, forming the three-proof composite panel. The thickness of the three-proof composite panel can be customized from 0.1 to 3 mm depending on the designed service life, and the preferred alloy plate is PW302 alloy plate.

[0047] Step S2: Prepare underwater non-segregating grout (preferably HHY-HYSJ).

[0048] Underwater non-segregating grout is used as a connection material between the building structure and the three-proof composite panel in seawater.

[0049] Specifically, the preferred option is:

[0050] The required grouting volume is determined based on the measuring tape, and underwater non-segregating grout is prepared. This underwater non-segregating grout is used as a connecting material between the building structure and the three-proof composite panel in seawater. Through its gravity and non-segregating properties, it effectively removes air and water from the three-proof reinforcement system while ensuring structural density.

[0051] Step S3: Prefabricated three-proof composite panel

[0052] Use an electric drill to drill holes in the surface of the three-proof composite board, and use copper wire to fix the binding straps to the three-proof composite board.

[0053] Specifically, the preferred option is:

[0054] Based on the design and owner requirements, as well as the shape (circular or square) and size of the offshore structure, chemical insulation boards and PW302 alloy boards for preventing marine organism adhesion are cut on-site on the coast.

[0055] Apply epoxy adhesive evenly to the cut surface of the chemical insulation board, then attach the PW302 new alloy plate for preventing marine organism adhesion. Once fully bonded and secure, a three-proof composite board is formed.

[0056] Use a power drill to make holes in the surface of the three-proof composite board, and use copper wire to fix the cable ties to the three-proof composite board. Generally, three layers of cable ties are used: top, middle, and bottom. The flexible mold used for sealing the bottom is fixed at the same horizontal line as the bottommost cable tie.

[0057] Step S4: Construct an offshore work platform

[0058] Specifically, the preferred option is:

[0059] Use the spliced ​​floating equipment as a working platform and tighten it with bolts and nuts of corresponding size; erect a gantry frame on the platform and use tension adjusters to connect the two ends of the gantry frame and the floating equipment platform respectively for tight connection; use green netting as a protective structure around the floating equipment platform to prevent it from falling into the water.

[0060] Step S5, Base Surface Treatment

[0061] Remove contaminants from the surface of the building structure in seawater and roughen the surface of the building structure in seawater;

[0062] Specifically, the preferred option is:

[0063] Use a long-handled wire brush to remove contaminants from the building structure surface in seawater, including loose concrete; use a roughening machine to roughen the concrete surface of the building structure in seawater; after all treatment is completed, use a high-pressure water gun to rinse the concrete surface of the building structure in seawater to ensure that there is no loose concrete, cement slurry, or other contaminants, increasing the adhesion to the grouting material. If there is rust on the steel structure surface, use a wire brush and a high-pressure water gun to remove the rust; according to design requirements, anti-corrosion treatment can also be performed.

[0064] Step S51: Lay out ultra-high molecular weight polyethylene mesh fabric

[0065] After the base surface treatment is completed, at the locations where the three-proof reinforcement system needs to be installed in the seawater structure, ultra-high molecular weight polyethylene mesh cloth is evenly laid out and fixed with copper wire to increase the strength (this step depends on the design requirements).

[0066] Step S6: Install the three-proof composite panel

[0067] 1) Drill holes on both sides of the building structure above the seawater and install hooks to suspend tension adjusters. Specifically, drill holes on both sides of the building structure above the seawater (such as the cap beam) and install hooks to suspend tension adjusters.

[0068] 2) Transport the three-proof composite panels to the construction site via an offshore work platform and erect the three-proof composite panels. Specifically, the three-proof composite panels can be transported to the construction site via a floating equipment platform and erected. The three-proof composite panels have prefabricated hanging straps on top, which are connected to the fasteners to keep the three-proof composite panels in a suspended state.

[0069] 3) Connect the two ends of the three pre-fixed binding straps and tighten them initially so that the three-proof composite board surrounds the building structure in the seawater; one end of the three-proof composite board has a pre-made slot, insert the other end into the slot, and tighten the binding straps again; adjust the horizontal and vertical position of the three-proof composite board (if necessary, use pry bars or other auxiliary tools to adjust), and tighten the binding straps after it reaches the designed position.

[0070] 4) Lower the three-proof composite board to the designated position and ensure its balance. Then, install the three-proof composite board in the designated position and align it. Finally, use a strapping device to tie the three-proof composite board to the underwater structure to ensure a tight connection. Specifically, when installing the underwater three-proof composite board, the diver goes into the water, and the assistant transports the three-proof composite board to the surface. Under the unified coordination and command of the diver, the three-proof composite board is lowered to the designated position and its balance is ensured. Then, the diver installs the three-proof composite board in the designated position and aligns it. Finally, use a strapping device to tie the three-proof composite board to the underwater structure to ensure a tight connection.

[0071] 5) After all the three-proof composite panels are installed and tightened, use three-proof expansion bolts to connect and fix them at the vertical overlap positions and the overlap positions of the upper and lower three-proof composite panels. Specifically, after all the three-proof composite panels are installed and tightened, use a pneumatic screwdriver to drive three-proof expansion bolts at the vertical overlap positions and the overlap positions of the upper and lower three-proof composite panels. It is preferred to install the three-proof expansion bolts with a standard overlap of about 100-150mm. Vertically, they are generally fixed in a staggered two-longitudinal manner. The overlap length of the upper and lower three-proof composite panels is preferably 100-200mm. Before injecting the underwater non-segregating grout, the number of binding straps will be increased according to the requirements of the design institute and the owner to prevent formwork bulging.

[0072] Step S7: Prepare underwater non-segregating grout, preferably as follows:

[0073] Materials A and B should be mixed according to the material specifications to prepare the underwater non-segregation grout until they are uniformly mixed. The underwater non-segregation grout must be prepared and used immediately, and should be injected within 30 minutes after mixing.

[0074] Step S8: Inject underwater non-segregating grout, preferably as follows:

[0075] 11) Low-pressure injection is used, generally in two stages. The first stage is bottom injection (sealing), with a preferred injection height of 100-150mm. If necessary, a flexible mold can be used to reinforce the bottom surface to prevent grout leakage during later stages of grouting. If grout leakage occurs during bottom sealing (grout overflows underwater or divers can observe and touch for grout overflow underwater), the flexible mold should be repaired promptly, and a second bottom sealing should be performed until no leakage occurs.

[0076] 22) After the grout has initially cured, continue grouting the remaining grout. If two layers of three-proof composite panels overlap, after sealing the bottom, grouting should be done in two stages. The first stage should be grouted up to the overlap, and after initial curing, the second stage should be grouted up to the top. Before the second grouting, the material inlet and the visible conduit should be cleaned to prevent blockage. The initial curing time is generally about 4 hours. To expedite construction, two high-level material inlets can be installed and grouted alternately.

[0077] 33) If grout overflow occurs at vertical joints and upper and lower overlaps during grouting, stop grouting, repair the flexible mold, and resume grouting after initial curing. To reduce this phenomenon, sealant can be used to seal the overlaps before grouting.

[0078] 44) Determine the injection point by observing whether grout overflows from the holes of the fixing straps or by tapping them.

[0079] Step S9, Top Sealing

[0080] After the grout has initially cured, apply sealing adhesive evenly to the top of the three-proof composite board to seal the top. Specifically, the preferred method is:

[0081] After the grout has initially cured, apply the sealing adhesive evenly to the top of the three-proof composite board to seal the top. Stir the sealing adhesive evenly according to the product instructions. After the grout has completely cured, remove the fastening strip (whether to remove it depends on the requirements of the design institute and the owner).

[0082] Step S10, Surface Cleaning

[0083] After all construction is completed, remove the binding straps and clean any excess slurry or construction residue from the surface of the three-proof composite board to ensure a clean surface.

[0084] In this invention, the chemical insulating board and the alloy plate are bonded and fixed together by epoxy resin adhesive.

[0085] The above are merely preferred embodiments of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A method for reinforcing building structures in nuclear power plant cold source systems, characterized in that, Includes the following steps: Step S1: Preliminary on-site measurement; Before commencing construction, the installation location of the three-proof composite reinforcement system was confirmed on-site, and the specifications and dimensions were determined by measuring the actual dimensions. The system was then positioned on the surface of the building structure in the seawater. The three-proof composite reinforcement system consists of an inner layer of underwater non-segregating grout; a middle layer of anti-static and anti-conductivity chemical insulation board; and an outer layer of alloy plate to prevent marine organism attachment. Step S2: Prepare underwater non-segregating grout; Underwater non-segregating grout is used as a connection material between the building structure and the three-proof composite panel in seawater. Step S3: Prefabricate the three-proof composite panel; Use an electric drill to drill holes in the surface of the three-proof composite board, and use copper wire to fix the binding straps to the three-proof composite board. Step S4: Construct an offshore work platform; Step S5: Base surface treatment; Remove contaminants from the surface of the building structure in seawater and roughen the surface of the building structure in seawater; Step S6: Install the three-proof composite panel; 1) Drill holes on both sides of the building structure above the seawater and install hooks to suspend tension adjusters; 2) Transport the three-proof composite panels to the construction site via an offshore work platform and erect the three-proof composite panels; 3) Connect the two ends of the three pre-fixed binding straps and tighten them initially so that the three-proof composite board surrounds the building structure in the seawater; one end of the three-proof composite board has a pre-made slot, insert the other end into the slot, and tighten the binding straps again; adjust the horizontal and vertical position of the three-proof composite board, and after it reaches the design position, tighten the binding straps. 4) Lower the three-proof composite board to the designated position and ensure its balance. Then install the three-proof composite board in the designated position and align it. Then use the strapping device to tie the three-proof composite board to the building structure in the seawater so that it is tightly connected to the building structure in the seawater. 5) After all the three-proof composite panels are installed and tightened, use three-proof expansion bolts to connect and fix them at the vertical overlap positions and the overlap positions of the upper and lower three-proof composite panels. Step S7: Prepare underwater non-segregation grouting material; Step S8: Inject underwater non-segregating grout; Step S9: Top sealing; After the grout has initially cured, apply the sealing adhesive evenly to the top of the three-proof composite board to seal the top. Step S10: Surface cleaning; After all construction is completed, clean up any excess slurry or construction residue on the surface of the three-proof composite board to ensure a clean surface.

2. The method for reinforcing building structures in a nuclear power plant cold source system according to claim 1, characterized in that, The chemical insulating board and the alloy plate are bonded and fixed together by epoxy resin adhesive.

3. The method for reinforcing building structures in a nuclear power plant cold source system according to claim 1, characterized in that, The steps following step S5 and before step S6 include: Step S51: Lay out ultra-high molecular weight polyethylene mesh fabric; After the base surface is treated, ultra-high molecular weight polyethylene mesh is evenly laid out at the locations where the three-proof composite panels need to be installed in the seawater building structure.

4. A method for reinforcing building structures in a nuclear power plant cold source system according to claim 1, characterized in that, In step S6, 5), the overlap length of the upper and lower three-proof composite panels is 100-200mm.

5. A method for reinforcing building structures in a nuclear power plant cold source system according to claim 1, characterized in that, In step S6, 5), install the three-proof expansion bolts with a standard of 100-150mm, and fix them vertically in an alternating two-longitudinal manner.

6. A method for reinforcing building structures in a nuclear power plant cold source system according to claim 1, characterized in that, Step S8, injecting underwater non-segregating grout, specifically involves: 11) Use low-pressure injection grouting, which is divided into two injections. First, inject grout into the bottom and use a flexible mold to reinforce the bottom surface. The injection height is 100-150mm. 22) After the grout has initially solidified, continue to inject the remaining grout.

7. A method for reinforcing building structures in a nuclear power plant cold source system according to claim 6, characterized in that, If leakage occurs during the bottom sealing process in step 11), the flexible mold should be repaired promptly, and a second bottom injection should be performed until there is no leakage.

8. A method for reinforcing building structures in a nuclear power plant cold source system according to claim 6, characterized in that, In 22), if two pieces of three-proof composite board overlap, after sealing the bottom, it is necessary to inject the filler in two stages. The first stage is to inject the filler up to the overlap position, and after initial curing, the second stage is to inject the filler up to the top.

9. A method for reinforcing building structures in a nuclear power plant cold source system according to claim 6, characterized in that, Before grouting, sealant is used to seal the lap joints.

10. A method for reinforcing a building structure in a nuclear power plant cold source system according to any one of claims 1-9, characterized in that, The thickness of the three-proof composite board is 0.1-3mm.