CN110616861B - Thermal power plant concrete structure modification construction method - Google Patents
Thermal power plant concrete structure modification construction method Download PDFInfo
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- CN110616861B CN110616861B CN201910896083.XA CN201910896083A CN110616861B CN 110616861 B CN110616861 B CN 110616861B CN 201910896083 A CN201910896083 A CN 201910896083A CN 110616861 B CN110616861 B CN 110616861B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F13/00—Coverings or linings, e.g. for walls or ceilings
- E04F13/02—Coverings or linings, e.g. for walls or ceilings of plastic materials hardening after applying, e.g. plaster
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Abstract
The invention discloses a construction method for modifying a concrete structure of a thermal power plant, which comprises the following steps: (1) preparing a concrete finishing material; (2) cleaning a base layer: preparing tools, and cleaning the quality defect parts of the concrete beam column base layer; (3) local repairing of the base layer; (4) spraying a binder; (5) coating concrete finishing materials in a scraping mode; (6) and (6) polishing and cleaning. According to the invention, the concrete finishing material is prepared by adopting specific raw materials and proportions, so that the adhesive property is good, the strength is high, and the occurrence of repairing color difference can be prevented; the binding force between the concrete finishing material and the base layer is increased by spraying a layer of binder on the surface of the base layer before the concrete finishing material is blade-coated, so that the durability of the concrete finishing material is enhanced; the modified surface layer has the advantages of smoothness, uniform color, higher hardness, moisture resistance, no loss of the natural color of concrete and the like, does not need frequent maintenance in the later period, and has good durability.
Description
Technical Field
The invention belongs to the technical field of concrete modification construction, and particularly relates to a concrete structure modification construction method for a thermal power plant.
Background
The current electric power energy structure still takes thermal power as the main thing, and thermal power plant's concrete equipment basis is more, and equipment foundation secondary grouting shaping back, the grout blanket is great with basic outward appearance colour difference, and the impression is not good. The traditional modification method adopts putty scraping and paint spraying, which not only has high cost, but also changes the appearance color of the concrete. Therefore, a construction method which has low cost and keeps the color of the concrete basically unchanged is urgently needed to solve the problem.
The main structure of the main power house of the thermal power plant usually adopts a concrete frame structure, and the number of concrete beams and columns in the frame structure is large. Most beams and columns are exposed and have no decoration. The appearance defects such as chromatic aberration, slurry spraying pollution, mould expansion and slab staggering, honeycomb pitted surface and the like are easy to occur after the concrete beam and the concrete column are constructed and formed, so that the appearance is influenced. The traditional concrete beam column modification method comprises the following steps: the treatment effect is not ideal by methods such as mortar plastering of the beam column, sand paper polishing of the beam column and the like.
The appearance quality defects of concrete foundations, beams and columns of the thermal power plant not only cause poor visual perception, but also reduce the appearance process level of the whole thermal power plant. Therefore, how to solve the concrete structure defects of concrete foundations, beams, columns and the like of the thermal power plant to enable the concrete structure defects to be attractive and elegant is a problem which needs to be solved urgently in the industry of building the thermal power plant.
Disclosure of Invention
The invention aims to provide a concrete structure modification construction method for a thermal power plant, which is characterized in that concrete modification materials are prepared by adopting specific raw materials and proportions, so that the concrete structure modification construction method is good in cohesiveness and high in strength, and can prevent the occurrence of repair color difference; the binding force between the concrete finishing material and the base layer is increased by spraying a layer of binder on the surface of the base layer before the concrete finishing material is blade-coated, so that the durability of the concrete finishing material is enhanced; the modified surface layer has the advantages of smoothness, uniform color, higher hardness, moisture resistance, no loss of the natural color of concrete and the like, does not need frequent maintenance in the later period, and has good durability.
The purpose of the invention can be realized by the following technical scheme:
a construction method for modifying a concrete structure of a thermal power plant comprises the following steps:
(1) preparing a concrete finishing material: according to the cement: putty: white latex: weighing the raw materials according to the weight ratio of 4:2:1:2, mixing and uniformly stirring the raw materials, and blending the concrete finishing material for later use;
(2) cleaning a base layer: preparing tools, and cleaning the quality defect parts of the concrete beam column base layer;
(3) local repair of a base layer: after the base layer is cleaned, repairing local honeycomb, concave and corner damaged parts by adopting the concrete finishing material prepared in the step (1), and naturally drying;
(4) spraying a binder: according to clear water: latex 100: 15-20 parts by weight of a binder, and spraying the binder on the surface of the concrete matrix subjected to the step (3);
(5) coating concrete finishing material by blade coating: uniformly coating the modifying material prepared in the step (1) on a concrete base layer sprayed with a binder by using a batch cutter, after the first time of coating the concrete modifying material is finished, if the concrete surface layer is still uneven, and after the coated modifying material reaches 60-70% dryness, coating the next layer of the concrete modifying material until the surface layer is flat;
(6) polishing and cleaning: and (5) after finishing the step (5), rechecking the repaired surface layer, if the repaired surface layer sinks, rechecking and leveling the sunk part by using a concrete finishing material, after the rechecking is finished, airing the finishing material after blade coating, polishing the surface layer of the concrete finishing material by using sand paper, and removing dust on the surface layer to finish the finishing construction.
Furthermore, the cement used in the concrete finishing material and the cement in the concrete to be finished are of the same type.
Further, the step (2) of cleaning the base layer comprises the following specific steps: the method comprises the steps of cleaning sundries of plastic skins, paper and adhesive tapes on the surface of concrete by using a small scraper knife and an art designer knife, polishing protrusions on the surface of the concrete by using abrasive paper and a polishing machine, and chiseling concrete slab staggering and honeycomb rough surfaces by using a hammer and a steel chisel until the quality defects on the surface of a concrete substrate are cleaned.
Further, the thickness of each layer of the concrete finishing material scraped in the step (5) is controlled to be 1-2 mm.
Further, in the step (6), the concrete finishing material surface layer is polished by abrasive paper, firstly, 100-mesh coarse abrasive paper is used for polishing, then 1200-mesh fine abrasive paper is used for polishing until the surface layer is polished flat, and finally, dry and soft rag is used for wiping off dust on the surface layer.
The invention has the beneficial effects that:
(1) the concrete finishing material adopted by the invention combines cement, putty, white latex and water together, and the excellent characteristics of the cement, the putty, the white latex and the water are fully embodied by a specific blending proportion, and the cement raw material and the type of the cement in the concrete to be finished are kept consistent, so that the occurrence of the color difference during repairing can be prevented; the concrete finishing material integrates the advantages of cement, putty and latex, and is a good material for finishing the concrete surface layer;
(2) the invention carries out the spraying step of the binder before carrying out blade coating on the base layer to the concrete finishing material, the spraying of the binder can increase the binding power of the concrete base layer, increase the binding force between the concrete finishing material and the base layer, and further enhance the durability of the concrete finishing material;
(3) the surface layer finished by the method has the advantages of smoothness, uniform color, higher hardness, moisture resistance, no loss of the natural color of concrete and the like, does not need frequent maintenance in the later period, has good durability and low construction cost, is not easy to fall off even if a mechanical vibration foundation or a beam column is adopted, and has wide application in the field of appearance modification of concrete beams, concrete columns, concrete foundations, concrete structural parts and the like.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A construction method for modifying a concrete structure of a thermal power plant comprises the following steps:
(1) preparing a concrete finishing material; (2) cleaning a base layer; (3) local repairing of the base layer; (4) spraying a binder; (5) coating concrete finishing materials in a scraping mode; (6) polishing and cleaning;
specifically, (1) concrete finishing material preparation comprises the following specific steps: and preparing the concrete finishing material, wherein one part of the concrete finishing material is used for repairing local depressions and corner damage of the surface layer, and the other part of the concrete finishing material is used for coating the concrete base layer. The blending method of the concrete finishing material comprises the following steps: cement: putty: white latex (polyvinyl acetate): the weight ratio of water to water is 4:2:1: 2. And (3) mixing the materials in the proportion and uniformly stirring to prepare the concrete finishing material (note that the varieties of the used cement and the modified cement in the concrete are kept consistent, so that color difference is prevented). The concrete finishing material in the proportion basically keeps the natural color of the concrete, and the strength of the finishing material after solidification is higher due to the action of the white latex; not only has good cohesiveness, but also does not need to paint the surface layer, and has lower economic cost. The composite concrete finishing material integrates the advantages of cement, putty and latex, and is a good material for finishing a concrete surface layer. Note that the latex is not limited to white latex (polyvinyl acetate), and may be replaced by other environment-friendly glue or environment-friendly glue powder.
(2) The specific steps of base layer cleaning are as follows: the appearance defects of the concrete beam column mainly comprise the following problems: concrete color difference, surface slurry spraying pollution, mold expansion and dislocation, honeycomb pitted surface and the like. In order to quickly treat the appearance defects and the basic layer cleaning, the following tools are prepared: a small spatula, sandpaper, polisher, hammer, steel chisel, mask, goggles, gloves, utility knife, soft rag, batch knife, etc. Before the basic layer is cleaned, the labor protection articles are worn, the goggles are worn to prevent dust and sundries from hurting eyes, and the mask is worn to prevent dust from being sucked into lungs to cause occupational diseases. After the preparation work is finished, the base layer is cleaned by using a tool prepared in advance, and a small shovel knife and an art knife are used for cleaning sundries such as plastic skins, paper, adhesive tapes and the like on the surface of the concrete; the sand paper is used for grinding small raised particles on the surface of the concrete; the polishing machine is used for polishing large protrusions on the surface of the concrete; the hammer and the steel chisel are used for chiseling staggered concrete blocks and honeycomb pitted surfaces; and (4) after the quality defects of the concrete beam column base layer are cleared, entering the next procedure.
(3) The method comprises the following specific steps of local base layer repair: after the base layer is cleaned, repairing the damaged parts of local honeycombs, pits and edges and corners, and repairing the local defects by using a prepared concrete finishing material.
(4) The concrete steps of spraying the binder are as follows: before a concrete matrix is coated with a finishing material in a scraping way, firstly, a binder is sprayed, the spraying is uniform and consistent, no part with missing spraying is required, and the mixing ratio (weight ratio) of the binder is clear water: latex 100: 15-20, the binder meets the latest national environmental protection standard requirements, products forbidden and eliminated by the national regulations cannot be adopted, and particularly latex with excessive formaldehyde cannot be adopted. The purpose of spraying the binder is to increase the binding power of the concrete base layer, increase the binding force between the concrete finishing material and the base layer and further enhance the durability of the concrete finishing material.
(5) The concrete finishing material is coated by blade coating, and the concrete finishing material comprises the following specific steps: the prepared finishing material is uniformly coated on a concrete base layer by a prepared batch cutter, all tiny sand holes and cracks need to be fully scraped, and the degree is that the fine sand holes and the cracks are compact and smooth, and the line angle and the edges are neat. After the first time of coating the concrete finishing material, if the concrete surface layer is still uneven, and after the first time of coating the finishing material reaches 60-70 percent of dryness, coating the finishing material for the next time. The thickness of the scraping and modifying material is generally controlled to be about 1 mm-2 mm. In the process of scraping the dressing material, if raised sand grains or other impurities are found, the dressing material needs to be disposed in time.
(6) Polishing and cleaning: and after finishing coating the surface layer with the finishing material, rechecking the repaired surface layer, and if the repaired surface layer has problems, rechecking and leveling the collapsed part by using the finishing material. After the completion of the repeated compensation, after the decoration material waiting for blade coating is dried, the surface layer of the decoration material is polished by using the sand paper prepared in advance, the surface layer is polished by using the coarse sand paper, and then the surface layer is polished by using the fine sand paper. After the finishing material surface layer is ground flat, the surface layer can generate more dust, the dust on the finishing material surface layer is wiped clean by using a prepared dry soft rag, and after the working procedure is finished, the surface of the concrete base layer is flat, uniform in color, free of color difference and smooth.
Description of the process principle: according to the construction method for modifying the concrete structure of the thermal power plant, cement, putty, glue and water are combined together, the excellent characteristics of the cement, the putty, the glue and the water are fully embodied through a specific blending proportion, and through chemical reaction among the raw materials, the modified surface layer has the characteristics of smoothness, uniform color, higher hardness, moisture resistance, no loss of the natural color of concrete and the like, frequent maintenance in the later period is not needed, the durability is good, the construction cost is low, and the modified surface layer is not easy to fall off even if a mechanical vibration foundation or a beam column is adopted. Through practice, the construction method is popularized and used in a plurality of thermal power plants, and is widely applied to appearance modification of concrete beams, concrete columns, concrete foundations, concrete structural accessories and the like. The construction method is not limited to the modification of the concrete structure of the thermal power plant, the appearance modification of other scenes is also applicable, and if the modified concrete foundation is in a humid or water environment, the waterproof finish paint can be added after the modification is finished.
Example (b):
a660 WM unit power plant in inner Mongolia modifies a steam turbine room running layer beam column by the construction method, the modification surface area from an A shaft of a No. 2 machine to a B shaft beam column is 2980 square meters, the construction cost is 75000 yuan, about 25.2 yuan per square meter, the construction cost is lower, and the modification effect is attractive and elegant.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (1)
1. A construction method for modifying a concrete structure of a thermal power plant is characterized by comprising the following steps:
(1) preparing a concrete finishing material: according to the cement: putty: white latex: weighing the raw materials according to the weight ratio of 4:2:1:2, mixing and uniformly stirring the raw materials, and blending the concrete finishing material for later use;
(2) cleaning a base layer: preparing tools, and cleaning the quality defect parts of the concrete beam column base layer;
(3) local repair of a base layer: after the base layer is cleaned, repairing local honeycomb, concave and corner damaged parts by adopting the concrete finishing material prepared in the step (1), and naturally drying;
(4) spraying a binder: according to clear water: latex 100: 15-20 parts by weight of a binder, and spraying the binder on the surface of the concrete matrix subjected to the step (3);
(5) coating concrete finishing material by blade coating: uniformly coating the modifying material prepared in the step (1) on a concrete base layer sprayed with a binder by using a batch cutter, after the first time of coating the concrete modifying material is finished, if the concrete surface layer is still uneven, and after the coated modifying material reaches 60-70% dryness, coating the next layer of the concrete modifying material until the surface layer is flat;
(6) polishing and cleaning: after the step (5) is finished, rechecking the repaired surface layer, if the repaired surface layer sinks, rechecking and leveling the sunk part by using a concrete finishing material, after the rechecking is finished, drying the finishing material after blade coating, polishing the surface layer of the concrete finishing material by using abrasive paper, removing the dust on the surface layer, and finishing the finishing construction;
the cement adopted in the concrete finishing material and the cement in the concrete to be finished are of the same type;
the specific steps of cleaning the base layer in the step (2) are as follows: cleaning plastic skins, paper and adhesive tape sundries on the surface of the concrete by using a small scraper knife and an art designer knife, polishing protrusions on the surface of the concrete by using abrasive paper and a polishing machine, and chiseling concrete slab staggering and honeycomb rough surfaces by using a hammer and a steel chisel until the quality defects on the surface of the concrete substrate are cleaned;
the thickness of each layer of the concrete finishing material blade-coated in the step (5) is controlled to be 1-2 mm;
and (6) polishing the surface layer of the concrete finishing material by using abrasive paper, firstly polishing by using 100-mesh coarse abrasive paper, then polishing by using 1200-mesh fine abrasive paper, and finally wiping off dust on the surface layer by using dry and soft cleaning cloth.
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| CN114607165A (en) * | 2022-03-01 | 2022-06-10 | 中国化学工程第十四建设有限公司 | Method for repairing appearance quality defect of concrete frame |
| CN116283103A (en) * | 2023-03-31 | 2023-06-23 | 上海宝冶集团有限公司 | Composite repairing agent for concrete surface and civil building concrete ground repairing method |
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| CN1414196A (en) * | 2001-10-25 | 2003-04-30 | 云南建工装饰工程有限公司 | External wall magnetic surface whitewash technology |
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