Large crack-proof thin-wall pool and construction method thereof

Abstract

The present invention discloses a large-scale anti-cracking thin-walled water pool and a construction method thereof. The large-scale anti-cracking thin-walled water pool includes a plurality of pool bodies, and the pool bodies include a bottom plate, a wall body and a top plate. The bottom plate, the wall body and the top plate are all provided with a plurality of crisscrossing reinforcement strips and a plurality of crisscrossing post-cast strips. The post-cast strips divide the pool body into a plurality of array-distributed casting compartments. The present invention divides the pool body into a plurality of array-distributed casting compartments by the post-cast strips, which can achieve compartment-based flow construction, shorten the flow rhythm, thereby reducing the construction difficulty, simplifying the construction process, and shortening the construction period; at the same time, the pool body adopts a combination of reinforcement strips and post-cast strips, which can achieve the purpose of reducing expansion joints and prevent the failure of the concrete waterproofing of the pool body due to cracking of the thin wall.

Description

Technical Field

[0001] The present invention relates to the technical field of thin-wall pool casting, in particular to a large-scale crack-proof thin-wall pool and a construction method thereof. Background Art

[0002] Currently, most water tanks in industrial and residential buildings utilize thin-walled reinforced concrete. These tanks require very high waterproofing levels, and their primary structure is constructed entirely of waterproof concrete. Conventional casting methods, however, present significant challenges due to the relatively thin walls and the high formwork required. These methods also require high standards for construction techniques. Even the slightest inaccuracy in the concrete's properties, workability, and construction techniques can lead to failure in waterproofing the primary concrete. Even with a surface waterproofing layer, the tank can still leak.

[0003] The above defects need to be improved. Summary of the Invention

[0004] In order to overcome the deficiencies of the existing technology, the present invention provides a large crack-resistant thin-walled pool and a construction method thereof.

[0005] The technical solution of the present invention is as follows:

[0006] In the first aspect, the present invention provides a large-scale anti-cracking thin-walled water pool, comprising a plurality of pool bodies, wherein the pool bodies comprise a bottom plate, a wall body and a top plate, and the bottom plate, the wall body and the top plate are all provided with a plurality of criss-cross reinforcement strips and a plurality of criss-cross post-cast strips, and the post-cast strips divide the pool body into a plurality of array-distributed casting compartments.

[0007] According to the present invention of the above scheme, the tank body is a multi-stage AO biological tank body.

[0008] According to the present invention of the above solution, an expansion agent is provided in the concrete for pouring the sub-compartments.

[0009] According to the present invention of the above solution, the thickness of the concrete protective layer of the bottom plate is not less than 40 mm, the thickness of the concrete protective layer of the wall is not less than 30 mm, and the thickness of the concrete protective layer of the top plate is not less than 20 mm.

[0010] According to the present invention of the above solution, the width of the reinforcement strip is not less than 2000 mm, and the width of the post-cast strip is not less than 800 mm.

[0011] According to the present invention of the above scheme, a plurality of longitudinally arranged top plate deformation joints are provided on the bottom plate, a plurality of longitudinally arranged bottom plate deformation joints are provided on the top plate, the top plate deformation joints and the bottom plate deformation joints are both filled with polysulfide sealing paste, a horizontally arranged wall construction joint is provided on the wall, a waterstop is provided on the wall construction joint, and the waterstop intersects the wall construction joint vertically.

[0012] On the other hand, a construction method of a large anti-crack thin-walled pool as any of the above technical solutions comprises:

[0013] S1. Bin setting: Use the skip bin method to divide the tank into several casting bins, and determine the construction time and sequence of each casting bin;

[0014] S2. Concrete material preparation: Screening of cement, sand, and gravel raw materials, adding expansion agent to concrete, controlling concrete alkali content, water-cement ratio, concrete slump, and initial and final setting time of concrete;

[0015] S3. Reinforcement belt setting: several crisscross reinforcement belts are set on the bottom plate, wall and top plate of the pool body;

[0016] S4. Post-casting strip setting: post-casting strips are set between adjacent casting compartments;

[0017] S5. Rebar bundling and formwork installation: Bundle the steel bars in all parts of the tank body, and then install the formwork;

[0018] S6. Concrete pouring: pour concrete according to the divided positions;

[0019] S7. Film curing: Film curing is carried out after the initial setting of the concrete and before the final setting.

[0020] According to the present invention of the above scheme, in step S6, when pouring one of the pouring compartments, the bottom plate concrete and the reinforcement strip on the bottom plate are poured first, then the wall and the reinforcement strip on the wall are poured, and finally the top plate concrete and the reinforcement strip on the top plate are poured; the post-pouring strip is poured 42 days after the surrounding pouring compartments are completed.

[0021] According to the present invention of the above scheme, in step S2, ordinary Portland cement R42.5 is selected as cement; natural medium-coarse sand is selected as sand, with an average particle size of not less than 0.3 mm and a mud content of less than 3.0%; and gravel is selected as gravel with a particle size of not more than 40 mm, a mud content of less than 10%, and a water absorption rate of less than 1.5%.

[0022] According to the present invention of the above aspect, the concrete of the reinforcing strip and the post-cast strip has a strength one level higher than that of the concrete of the remaining parts.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention divides the pool into multiple array-distributed casting compartments through post-casting strips, which can achieve compartment-by-compartment flow construction, shorten the flow beat, thereby reducing construction difficulty, simplifying construction technology, and shortening construction period;

[0025] 2. The pool body of the present invention adopts a combination of reinforcement belt and post-casting belt, which can achieve the purpose of reducing expansion joints and prevent the failure of waterproofing of the pool body concrete due to cracking of thin walls;

[0026] 3. The present invention adds an expansion agent to the poured concrete, which can compensate for the shrinkage of the concrete by an equal amount and has the function of filling and blocking capillary pores. It increases the cost at a low level but greatly improves the anti-seepage and anti-cracking ability of the concrete, reducing the possibility of leakage in the pool.

[0027] 4. The present invention performs film curing after the initial setting and before the final setting of the poured concrete, so that the concrete curing film is closely combined with the concrete surface, promotes the hydration effect of the concrete, plays a significant role in preventing cracking and moisturizing, and further reduces the possibility of leakage in the pool. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0029] Figure 2 This is a schematic plan view of a base plate according to an embodiment of the present invention.

[0030] In the figure,

[0031] 1. Pool body; 101. Bottom plate; 102. Reinforcement strip; 103. Post-pouring strip; 104. Pouring compartment. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0033] It should be noted that the terms "install", "set", "connect", "fix" and the like should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium; they can be internal connections between two elements or interactions between two elements, unless otherwise clearly defined. The directions or positions indicated by the terms "upper", "lower", "top", "bottom", "inside", "side" and the like are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on this technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Several" means one or more, unless otherwise clearly defined. "Multiple" means two or more, unless otherwise clearly defined.

[0034] See also Figure 1 、 Figure 2 The present invention provides a large-scale anti-cracking thin-walled water pool, comprising two parallel and symmetrically arranged pool bodies 1, the pool body 1 being a multi-section AO biological pool body, and the size of a single pool body 1 being 103.675m×137.575m. The pool body 1 comprises a bottom plate 101, a wall body and a top plate, and the bottom plate 101, the wall body and the top plate are all provided with a number of crisscrossing reinforcement strips 102 and a number of crisscrossing post-casting strips 103, wherein the post-casting strips 103 divide the pool body 1 into a number of array-distributed casting compartments 104. The present invention divides the pool body 1 into a number of array-distributed casting compartments 104 through the post-casting strips 103, which can achieve compartment-based flow construction, shorten the flow rhythm, thereby reducing the construction difficulty, simplifying the construction process, and shortening the construction period; at the same time, the pool body adopts the combination of the reinforcement strip 102 and the post-casting strip 103, which can achieve the purpose of reducing expansion joints and preventing the failure of the pool body concrete waterproofing due to cracking of the thin wall.

[0035] In a preferred embodiment, an expansive agent is provided in the concrete for pouring the compartment 104. The addition of the expansive agent during pouring can compensate for the shrinkage of the concrete by an equal amount and has the function of filling and blocking capillary pores. It increases the cost less but greatly improves the anti-seepage and anti-cracking ability of the concrete, and reduces the possibility of leakage in the pool.

[0036] In a preferred embodiment, the thickness of the concrete protective layer of the bottom plate 101 is not less than 40 mm, the thickness of the concrete protective layer of the wall is not less than 30 mm, and the thickness of the concrete protective layer of the top plate is not less than 20 mm. The setting of the concrete protective layer thickness of the above-mentioned bottom plate 101, wall and top plate can effectively prevent leakage and ensure the concrete molding quality of the bottom plate 101, wall and top plate.

[0037] In a preferred embodiment, the width of the reinforcing strip 102 is not less than 2000 mm, and the width of the post-casting strip 103 is not less than 800 mm. The width settings of the above-mentioned reinforcing strip 102 and post-casting strip 103 can effectively ensure the thin-wall cracking of large-scale crack-proof thin-wall water pools.

[0038] In a preferred embodiment, the bottom plate 101 is provided with several longitudinal top plate expansion joints, and the top plate is provided with several longitudinal bottom plate expansion joints. Providing expansion joints on the bottom plate 101 and the top plate effectively prevents concrete cracking caused by factors such as temperature, settlement, and vibration. Both the top plate expansion joints and the bottom plate expansion joints are filled with polysulfide sealant. By filling the expansion joints with polysulfide sealant, adhesion to the concrete on both sides of the expansion joints is ensured, maintaining good airtightness and waterproofing properties under conditions of expansion, contraction, vibration, and temperature fluctuations, thereby effectively waterproofing the walls. Furthermore, horizontal construction joints are provided on the walls, and waterstops are provided on the wall construction joints, intersecting the wall construction joints at right angles. Providing waterstops on the wall construction joints effectively prevents water leakage at the wall construction joints.

[0039] In another aspect, the present invention provides a method for constructing a large-scale crack-proof thin-walled pool, comprising the following steps:

[0040] Step S1, compartment setting: Use the skipping method to divide the tank body 1 into several pouring compartments 104, and determine the construction time and sequence of each pouring compartment 104. Figure 1 The multi-stage AO biological pool shown includes two pool bodies 1 arranged parallel and symmetrically up and down. The size of a single pool body 1 is 103.675m×137.575m. Each pool body 1 is divided into 6 array-distributed casting compartments 104, and is arranged according to the Figure 1 The multi-section AO bio-tank is numbered as shown. The construction order for the six casting compartments 104 of the upper tank body 1 is: compartment 1, compartment 3, compartment 5, compartment 2, compartment 4, and compartment 6; the construction order for the six casting compartments 104 of the lower tank body 1 is: compartment 10, compartment 12, compartment 8, compartment 11, compartment 7, and compartment 9.

[0041] Step S2, concrete material preparation: screening cement, sand, and gravel raw materials, adding expansion agent into concrete, controlling concrete alkali content, water-cement ratio, concrete slump, and initial and final setting time of concrete.

[0042] Among them, ordinary Portland cement R42.5 is used as cement; natural medium-coarse sand is used as sand, with an average particle size of not less than 0.3mm and a mud content of less than 3.0%; gravel is used with a tight structure, high strength, a particle size of not more than 40mm, a mud content of less than 10%, and a water absorption rate of less than 1.5%; the alkali content of concrete shall comply with relevant management regulations, and the total alkali content limit is required to be 3kg / m3; the water-cement ratio of concrete shall not be greater than 0.55; the slump of concrete shall be generally controlled between 140mm and 180mm, the horizontal components shall be controlled at 140mm±20mm, and the vertical components shall be controlled at 160mm±20mm; the initial setting time of concrete shall be controlled at 1h~3h, and the final setting time of concrete shall be controlled at 12h~16h.

[0043] Step S3: Installing reinforcement strips 102: Install a plurality of crisscross reinforcement strips 102 on the bottom plate 101, walls, and roof of the tank body 1. The reinforcement strips 102 are sealed with a quick-closing mesh and firmly supported with steel bars. This ensures the required casting of the bottom plate 101, walls, and roof, while facilitating the subsequent casting of the reinforcement strips 102.

[0044] Step S4, setting of post-casting strips 103: Post-casting strips 103 are set between adjacent casting compartments 104. Post-casting strips 103 are closed with a quick-closing net and firmly supported with steel bars, which not only ensures the casting needs of the casting compartments 104, but also facilitates the subsequent casting construction of post-casting strips 103.

[0045] Step S5, steel bar bundling and formwork installation: the steel bars at all parts of the tank body 1 are bundled, and then the formwork is installed.

[0046] Step S6, Concrete Pouring: Concrete is poured according to the designated locations. When pouring one of the pouring compartments 104, the concrete for the bottom slab 101 and the reinforcement strip 102 on it are poured first. The walls and the reinforcement strip 102 on them are then poured. Finally, the top slab concrete and the reinforcement strip 102 on them are poured. The post-cast strip 103 is poured 42 days after the surrounding pouring compartments 104 are completed. The concrete in the reinforcement strip 102 and post-cast strip 103 is one grade higher in strength than the concrete in the remaining areas.

[0047] The concrete pouring process for base plate 101 utilizes a continuous pouring process, with thin layers poured in a gradual, evenly rising, and reaching the top in one go. During pouring, the concrete is layered in an inclined manner, with a layering scale used to control the layer thickness to 300mm to 400mm (based on the thickness of base plate 101, not exceeding 400mm). The concrete is advanced at a 1:6 slope. Two vibration points are arranged based on the slope formed during pouring: the first at the concrete discharge point and the second at the concrete slope angle. After the concrete is poured and vibrated to density, it is applied using a single-pass finishing process. Before the concrete initially sets, the surface is smoothed with a 2m scraper to remove surface water seepage. Before the concrete finally sets, it is smoothed with a wooden trowel and then smoothed with an iron trowel two to three times to reduce shrinkage of the surface concrete and prevent surface shrinkage cracks. This concrete pouring process for base plate 101 ensures the structural integrity and waterproofness of the concrete for base plate 101 and prevents the occurrence of cold joints.

[0048] Before pouring the wall concrete, a 50mm thick, reduced-gravel cement mortar with the same mix as the wall concrete should be evenly spread across the wall joints. The mortar should be placed in a mortar trough and evenly distributed manually into the mold; it should not be poured directly into the mold using a pump pipe. When pouring the wall concrete in layers, a layer gauge rod should be constructed to control the thickness of the concrete layer. The layer thickness should be approximately 50cm. Concrete vibration should be performed using an inserted vibrator. When pouring in layers, the vibrator should be inserted 50mm into the lower layer to eliminate joints between layers.

[0049] Among them, a construction road should be laid before pouring the concrete of the top plate. Its width should be no less than 800mm, and it should be able to ensure the construction road for operators, prevent stepping on steel bars, ensure the correct position of the bent steel bars, and the thickness of the protective layer of the top plate steel bars. It should be removed in time after the concrete is poured. When pouring the concrete of the top plate, use fixed-length marker piles for pre-measurement, and use a small white line to pull the elevation control line according to the control points marked with red tape on the wall steel bars to check the thickness. The laying thickness of the concrete of the top plate should be slightly larger than the thickness of the top plate. Use a flat vibrator to vibrate back and forth. When using a vibrating rod, it should be dragged and vibrated in the pouring direction. The angle should be controlled at 60 degrees. After the vibration is completed, use a 3m long ruler to scrape it flat according to the elevation control line to ensure the surface flatness, and smooth it before initial setting. At the same time, in order to prevent shrinkage cracks in the concrete of the top plate, use a 2m scraper to scrape it along the base of the four walls toward the middle of the plate before the concrete begins to set. Use a wooden trowel to smooth and compact it 2 to 3 times before final setting, and ensure that the concrete is flat.

[0050] Step S7, film curing: Film curing is performed after the initial setting of the concrete and before the final setting. During the film curing process, the concrete curing film is tightly bonded to the concrete surface, promoting the hydration of the concrete, playing a significant role in preventing cracks and retaining moisture, and further reducing the possibility of leakage in the pool.

[0051] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

[0052] The above is an exemplary description of the patent of the present invention in conjunction with the accompanying drawings. It is obvious that the implementation of the patent of the present invention is not limited to the above-mentioned method. As long as various improvements are made by adopting the method concept and technical solution of the patent of the present invention, or the concept and technical solution of the patent of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A large crack-proof thin-walled pool, characterized in that: The tank body comprises a bottom plate, a wall plate and a top plate. The bottom plate, the wall plate and the top plate are all provided with a plurality of crisscross reinforcement strips and a plurality of crisscross post-casting strips. The post-casting strips divide the tank body into a plurality of array-distributed casting compartments. The construction method of the large anti-crack thin-wall pool includes: S1. Bin setting: Use the skip bin method to divide the tank into several casting bins, and determine the construction time and sequence of each casting bin; S2. Concrete material preparation: Screening of cement, sand, and gravel raw materials, adding expansion agent to concrete, controlling concrete alkali content, water-cement ratio, concrete slump, and initial and final setting time of concrete; S3. Reinforcement belt setting: several crisscross reinforcement belts are set on the bottom plate, wall and top plate of the pool body; S4. Post-casting strip setting: post-casting strips are set between adjacent casting compartments; S5. Rebar bundling and formwork installation: Bundle the steel bars in all parts of the tank body, and then install the formwork; S6. Concrete pouring: pour concrete according to the divided positions; S7, film curing: film curing is carried out after the initial setting of concrete and before the final setting; In step S6, when pouring one of the pouring compartments, first pour the bottom plate concrete and the reinforcement strip on the bottom plate, then pour the wall and the reinforcement strip on the wall, and finally pour the top plate concrete and the reinforcement strip on the top plate; the post-pouring strip is poured 42 days after the surrounding pouring compartments are completed.

2. The large crack-proof thin-walled pool according to claim 1, characterized in that: The pool body is a multi-section AO biological pool body.

3. The large crack-proof thin-walled pool according to claim 1, characterized in that: An expansion agent is provided in the concrete for pouring the sub-compartments.

4. The large crack-proof thin-walled pool according to claim 1, characterized in that: The thickness of the concrete protective layer of the bottom plate is not less than 40 mm, the thickness of the concrete protective layer of the wall is not less than 30 mm, and the thickness of the concrete protective layer of the top plate is not less than 20 mm.

5. The large crack-proof thin-walled pool according to claim 1, characterized in that: The width of the reinforcement strip is not less than 2000 mm, and the width of the post-cast strip is not less than 800 mm.

6. The large crack-proof thin-walled pool according to claim 1, characterized in that: The bottom plate is provided with a plurality of longitudinally arranged top plate deformation joints, the top plate is provided with a plurality of longitudinally arranged bottom plate deformation joints, the top plate deformation joints and the bottom plate deformation joints are both filled with polysulfide sealing paste, the wall is provided with a horizontally arranged wall construction joint, the wall construction joint is provided with a waterstop, and the waterstop intersects the wall construction joint vertically.

7. The large crack-proof thin-walled pool according to claim 1, characterized in that: In step S2, ordinary Portland cement R42.5 is selected as cement; natural medium-coarse sand is selected as sand, with an average particle size of not less than 0.3 mm and a mud content of less than 3.0%; and gravel is selected with a particle size of not more than 40 mm, a mud content of less than 10%, and a water absorption rate of less than 1.5%.

8. The large crack-proof thin-walled pool according to claim 1, characterized in that: The concrete of the reinforcing strip and the post-casting strip is one level stronger than the concrete of the remaining parts.

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