Floor mass concrete anti-cracking structure

Abstract

The utility model relates to the technical field of concrete anti-cracking, in particular to a floor mass concrete anti-cracking structure which comprises a concrete filling material main body, and the concrete filling material main body is filled with an anti-cracking structure. According to the floor mass concrete anti-cracking structure, a reasonable layered pouring method is adopted, that is, a construction method of layered pouring, layered vibration, one inclined plane, continuous flexible pouring and one-time top reaching is adopted for flexible pouring of concrete, the thickness of each layer is controlled within 400 mm, each layer is staggered by about 5 m, the gradient of the inclined plane is 1: 6, all pouring layers are staggered front and back, and flexible pouring is carried out in a layered mode. The upper layer is connected before the lower layer is initially set, the combination and quality of the upper layer and the lower layer of the concrete are ensured, the surface of the uppermost layer of concrete is rolled by an iron roller before the initial set, the surface compactness is enhanced, and the concrete is flattened by a wood trowel for not less than three times after water is collected, so that early plastic shrinkage cracks on the surface layer of the concrete are eliminated.

Description

Technical Field

[0001] This utility model relates to the field of concrete crack prevention technology, and in particular to a crack prevention structure for large-volume concrete floors. Background Technology

[0002] The main characteristic of mass concrete, besides its large volume, is that the heat of hydration of cement is difficult to dissipate. Under the constraints of external environment or internal forces, it is highly susceptible to temperature shrinkage cracks. When the structure is subjected to a large load, microcracks begin to propagate due to tensile and compressive stresses, gradually increasing in number. If the load continues to increase, the microcracks begin to connect, developing into large cracks until the structure fails. The constrained temperature deformation of concrete structures generates temperature stress. When the temperature stress exceeds the tensile strength of the concrete at the same stage, the concrete will crack.

[0003] In summary, traditional large-volume concrete structures often employ diaphragm walls, slab foundations, and box foundations. Therefore, one of the main problems after cracking is basement leakage. This issue is often difficult to address, causing additional impacts on the building's usability. For example, structural repairs and leak sealing are not only difficult and costly, but also prolong the project's delivery time and reduce the building's functionality. Sometimes, repeated leak sealing during the building's use can even lead to sealing costs exceeding civil engineering costs, further reducing the building's structural rigidity. Therefore, a crack-resistant large-volume concrete floor structure is particularly needed. Utility Model Content

[0004] The purpose of this utility model is to provide a crack-resistant structure for large-volume concrete floors, addressing the problem mentioned in the background art. Traditional large-volume concrete structures, such as diaphragm walls, slab foundations, and box foundations, often suffer from basement leakage after cracking. This problem is often difficult to solve, causing additional impacts on the building's usability. For example, repairing and sealing leaks is not only difficult and costly, but also prolongs the project's delivery time and reduces the building's functionality. Sometimes, repeated leak sealing during the building's use can even lead to sealing costs exceeding civil engineering costs, further reducing the building's structural rigidity. Therefore, a crack-resistant structure for large-volume concrete floors is particularly needed.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a large-volume concrete anti-crack structure for flooring, comprising a concrete filling material body, wherein the interior of the concrete filling material body is filled with an anti-crack structure;

[0006] The crack-resistant structure includes a first filling opening, a first reinforcing steel layer, a second filling opening, a second reinforcing steel layer, a third reinforcing steel layer, a third filling opening, a first reinforcing transverse steel bar, a reinforcing spigot, a second reinforcing transverse steel bar, and a third reinforcing transverse steel bar. The inner ring of the concrete filling material body is filled with the first reinforcing steel layer, and the outer ring surface of the first reinforcing steel layer is welded with the first reinforcing transverse steel bar. The inner ring of the concrete filling material body is filled with the second reinforcing steel layer, and the outer ring surface of the second reinforcing steel layer is welded with the second reinforcing transverse steel bar. The inner ring of the concrete filling material body is filled with the third reinforcing steel layer, and the outer ring surface of the third reinforcing steel layer is welded with the third reinforcing transverse steel bar.

[0007] Preferably, the concrete filling material body has a first filling opening inside, and the first filling opening and the first steel reinforcement layer are structurally compatible.

[0008] Preferably, the inner surface of the first reinforcing transverse steel bar is provided with a reinforcing socket, and the size of the reinforcing socket and the first steel bar layer are matched.

[0009] Preferably, the first reinforcing transverse steel bar is connected between the first steel bar layer and the concrete filling material body, and there are multiple first reinforcing transverse steel bars that are parallel to each other.

[0010] Preferably, the concrete filling material body has a third filling opening inside, and the third filling opening and the third steel reinforcement layer are structurally compatible.

[0011] Preferably, the second reinforcing transverse steel bar is connected between the second steel bar layer and the concrete filling material body, and there are multiple second reinforcing transverse steel bars that are parallel to each other.

[0012] Preferably, the third reinforcing transverse steel bar is connected between the third steel bar layer and the concrete filling material body, and there are multiple third reinforcing transverse steel bars that are parallel to each other.

[0013] Preferably, the concrete filling material body has a second filling opening inside, and the second filling opening and the second steel reinforcement layer are structurally compatible.

[0014] Compared with the prior art, the beneficial effects of this utility model are: under normal temperature and allowable stress conditions, the performance of steel is relatively stable, and its thermal expansion coefficient is not much different from that of concrete. Therefore, when the temperature changes, the internal stress between steel and concrete is very small, and the elastic modulus of steel is 6-16 times larger than that of concrete. When the strength of concrete reaches the ultimate strength and the deformation reaches the ultimate tensile value, the stress begins to transfer to the steel bar, thereby avoiding the development of cracks.

[0015] In terms of construction, the rational configuration of steel reinforcement plays a significant role in improving the crack resistance of concrete structures. Engineering practice has proven that when the thickness of a concrete slab is 400-600mm, increasing the configuration of structural steel reinforcement can enable the structural reinforcement to act as temperature reinforcement, effectively improving the crack resistance of concrete. Placing steel reinforcement close to the concrete surface can improve the surface layer's resistance to surface cooling and drying shrinkage. The structural steel reinforcement should be small in diameter and small in spacing, for example, with a diameter of 6-14mm and a spacing controlled at 100-150mm, which can greatly improve the ability to resist penetrating cracks.

[0016] If symmetrical reinforcement is applied to the entire cross-section of the concrete, that is, steel bars are placed in the upper, middle and bottom of the concrete, and the reinforcement ratio is controlled between 0.3% and 0.5%, the ability to resist through cracking is the best. During the concrete pouring process, due to the large size of the concrete structure, the overall pouring at one time will generate a large temperature stress, which will inevitably produce temperature cracks. Therefore, a reasonable layered pouring method is adopted, that is, the construction method of "layered pouring, layered vibration, one sloping surface, continuous pouring, and one-time to the top" is adopted. The thickness of each layer is controlled within 400mm, each layer is staggered by about 5m, the slope of the sloping surface is 1:6, the pouring layers are staggered, and the layers are poured in a backward manner. The upper layer is connected before the lower layer initially sets to ensure the bonding and quality of the upper and lower concrete layers. Before the initial setting of the top layer of concrete, the surface is rolled with an iron roller to enhance the surface density. After the concrete has absorbed water, it is smoothed with a wooden trowel at least three times to eliminate early plastic shrinkage cracks in the concrete surface layer. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the slope side section structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the concrete structure of this utility model;

[0020] Figure 4 This is a side view of the concrete structure of this utility model;

[0021] Figure 5 This is a top sectional view of the concrete structure of this utility model;

[0022] Figure 6 This is a side sectional view of the concrete structure of this utility model.

[0023] In the diagram: 1. Main body of concrete filling material; 2. Crack-resistant structure; 201. First filling opening; 202. First reinforcement layer; 203. Second filling opening; 204. Second reinforcement layer; 205. Third reinforcement layer; 206. Third filling opening; 207. First reinforcing transverse reinforcement; 208. Reinforcing spigot; 209. Second reinforcing transverse reinforcement; 210. Third reinforcing transverse reinforcement. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-6 This utility model provides a technical solution: a large-volume concrete anti-crack structure for flooring, comprising a concrete filling material body, wherein the interior of the concrete filling material body is filled with an anti-crack structure;

[0026] The crack-resistant structure includes a first filling opening, a first reinforcing steel layer, a second filling opening, a second reinforcing steel layer, a third reinforcing steel layer, a third filling opening, a first reinforcing transverse steel bar, a reinforcing spigot, a second reinforcing transverse steel bar, and a third reinforcing transverse steel bar. The inner ring of the concrete filling material body is filled with the first reinforcing steel layer, and the outer ring surface of the first reinforcing steel layer is welded with the first reinforcing transverse steel bar. The inner ring of the concrete filling material body is filled with the second reinforcing steel layer, and the outer ring surface of the second reinforcing steel layer is welded with the second reinforcing transverse steel bar. The inner ring of the concrete filling material body is filled with the third reinforcing steel layer, and the outer ring surface of the third reinforcing steel layer is welded with the third reinforcing transverse steel bar.

[0027] Furthermore, the concrete filling material body has a first filling opening inside, and the first filling opening and the first steel reinforcement layer are structurally compatible. The first filling opening, which is structurally compatible with the first steel reinforcement layer, facilitates the user to fill the first steel reinforcement layer.

[0028] Furthermore, a reinforcing socket is provided on the inner surface of the first reinforcing transverse steel bar, and the size of the reinforcing socket matches that of the first steel bar layer. The reinforcing socket, which matches the size of the first steel bar layer, makes it easy for the user to connect the first steel bar layer and the first reinforcing transverse steel bar.

[0029] Furthermore, the first reinforcing transverse steel bar is connected to the first steel bar layer and the concrete filling material body, and there are multiple first reinforcing transverse steel bars that are parallel to each other. The multiple first reinforcing transverse steel bars that are parallel to each other make it easier for users to reinforce the concrete filling material body.

[0030] Furthermore, the concrete filling material body has a third filling opening inside, and the third filling opening and the third steel reinforcement layer are structurally compatible. The third filling opening, which is structurally compatible with the third steel reinforcement layer, makes it easy for the user to install the third steel reinforcement layer into the concrete filling material body.

[0031] Furthermore, the second reinforcing transverse steel bar is connected to the concrete filling material body through the second steel bar layer, and there are multiple second reinforcing transverse steel bars that are parallel to each other. The multiple parallel second reinforcing transverse steel bars facilitate the user to perform secondary reinforcement on the concrete filling material body.

[0032] Furthermore, the third reinforcing transverse steel bar is connected to the concrete filling material body through the third steel bar layer, and there are multiple third reinforcing transverse steel bars that are parallel to each other. The multiple parallel third reinforcing transverse steel bars facilitate the user to reinforce the concrete filling material body three times.

[0033] Furthermore, the concrete filling material body has a second filling opening inside, and the second filling opening and the second steel reinforcement layer are structurally compatible. The second filling opening, which is structurally compatible with the second steel reinforcement layer, makes it easy for the user to install the second steel reinforcement layer into the concrete filling material body.

[0034] Working Principle: Under normal temperature and allowable stress conditions, steel's properties are relatively stable. Its coefficient of thermal expansion is not significantly different from that of concrete. Therefore, the internal stress between steel and concrete is very small when the temperature changes. Furthermore, the elastic modulus of steel is 6-16 times greater than that of concrete. When the concrete reaches its ultimate strength and deformation reaches its ultimate tensile value, stress begins to transfer to the reinforcing steel, thus preventing crack propagation. Properly configuring reinforcing steel in the structural design plays a significant role in improving the crack resistance of concrete structures. Engineering practice has shown that when the thickness of a concrete slab is 400-600mm, increasing the configuration of structural reinforcing steel can allow it to act as temperature-regulating reinforcement, effectively improving the crack resistance of the concrete. Placing reinforcing steel close to the concrete surface can improve the surface layer's resistance to surface cooling and drying shrinkage. The structural reinforcing steel should be of small diameter and with small spacing, for example, 6-14mm in diameter and spaced at 100-150mm. This can greatly improve... To achieve high resistance to penetrating cracks, symmetrical reinforcement is used throughout the entire concrete section, with reinforcement bars placed at the top, middle, and bottom, and the reinforcement ratio controlled between 0.3% and 0.5%. This provides the best resistance to penetrating cracks. During concrete pouring, due to the large size of the concrete structure, a single pour will generate significant temperature stress, inevitably leading to temperature cracks. Therefore, a reasonable layered pouring method is adopted, which involves "layered pouring, layered vibration, a single sloping surface, continuous pouring, and pouring to the top in one go." The thickness of each layer is controlled within 400mm, and each layer is staggered by about 5m. The slope of the sloping surface is 1:6. The pouring layers are staggered, and the layers are poured backwards. The upper layer is joined before the lower layer initially sets to ensure the bonding and quality of the concrete layers. Before the top layer of concrete initially sets, the surface is rolled with an iron roller to enhance surface compaction. After the concrete has absorbed water, it is smoothed with a wooden trowel at least three times to eliminate early plastic shrinkage cracks on the concrete surface.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-volume concrete anti-crack structure for flooring, comprising a concrete filling material body (1), characterized in that: The concrete filling material body (1) is filled with a crack-resistant structure (2). The crack-resistant structure (2) includes a first filling opening (201), a first reinforcing bar layer (202), a second filling opening (203), a second reinforcing bar layer (204), a third reinforcing bar layer (205), a third filling opening (206), a first reinforcing transverse reinforcing bar (207), a reinforcing spigot (208), a second reinforcing transverse reinforcing bar (209), and a third reinforcing transverse reinforcing bar (210). The inner ring of the concrete filling material body (1) is filled with the first reinforcing bar layer (202), and the outer ring surface of the first reinforcing bar layer (202) is welded with the first reinforcing transverse reinforcing bar (207). The inner ring of the concrete filling material body (1) is filled with the second reinforcing bar layer (204), and the outer ring surface of the second reinforcing bar layer (204) is welded with the second reinforcing transverse reinforcing bar (209). The inner ring of the concrete filling material body (1) is filled with the third reinforcing bar layer (205), and the outer ring surface of the third reinforcing bar layer (205) is welded with the third reinforcing transverse reinforcing bar (210).

2. The anti-crack structure for large-volume concrete floors according to claim 1, characterized in that: The concrete filling material body (1) has a first filling opening (201) inside, and the first filling opening (201) and the first steel reinforcement layer (202) are structurally compatible.

3. The anti-crack structure for large-volume concrete floors according to claim 1, characterized in that: The inner surface of the first reinforcing transverse steel bar (207) is provided with a reinforcing socket (208), and the reinforcing socket (208) and the first steel bar layer (202) are matched in size.

4. The anti-crack structure for large-volume concrete floors according to claim 1, characterized in that: The first reinforcing transverse steel bar (207) is connected between the first steel bar layer (202) and the concrete filling material body (1), and there are multiple first reinforcing transverse steel bars (207) that are parallel to each other.

5. The anti-crack structure for large-volume concrete floors according to claim 1, characterized in that: The concrete filling material body (1) has a third filling opening (206) inside, and the third filling opening (206) and the third steel reinforcement layer (205) are structurally compatible.

6. The anti-crack structure for large-volume concrete floors according to claim 1, characterized in that: The second reinforcing transverse steel bar (209) is connected between the second steel bar layer (204) and the concrete filling material body (1), and there are multiple second reinforcing transverse steel bars (209) that are parallel to each other.

7. The anti-crack structure for large-volume concrete floors according to claim 1, characterized in that: The third reinforcing transverse steel bar (210) is connected between the third steel bar layer (205) and the concrete filling material body (1), and there are multiple third reinforcing transverse steel bars (210) that are parallel to each other.

8. The anti-crack structure for large-volume concrete floors according to claim 1, characterized in that: The concrete filling material body (1) has a second filling opening (203) inside, and the second filling opening (203) and the second steel reinforcement layer (204) are structurally compatible.

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