Rapid repairing and reinforcing method for concrete slab cracks

Abstract

The invention discloses a concrete slab crack rapid repairing and reinforcing method which comprises the following steps: 1) cutting a main crack: cutting the crack along the length direction of a crack to be repaired on a concrete slab to form the main crack; (2) auxiliary seams are cut, the extending direction of the main seam serves as the longitudinal direction, transverse auxiliary seams are cut on one side of the main seam at set intervals, and the transverse auxiliary seams penetrate through the main seam and then extend to the other side of the main seam; and (3) crack repairing is conducted, specifically, the main crack and the auxiliary crack are cleaned, then a corrugated steel bar is embedded in the auxiliary crack, repairing resin is poured into the main crack and the auxiliary crack synchronously, and crack repairing is completed after the resin is cured. According to the method, a fishbone-shaped net-shaped built-in reinforced sealing stress system is constructed, so that efficient repair and performance improvement of concrete cracks are realized, and the structural stability is better after repair.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete crack repair, and particularly to the repair of cracks on the concrete surfaces such as the floor of a building's concrete floor, the paving of a large concrete slab in a yard, and the road surface of a large concrete slab. Specifically, it relates to a method for quickly repairing and strengthening cracks on the concrete surface. Background Art

[0002] In the engineering field, cracks are likely to occur on the concrete surface due to factors such as load changes, temperature stress, and material shrinkage. Especially for large-area concrete surface structures such as the floor of a building's concrete floor, the paving of a large concrete slab in a yard, and the road surface of a large concrete slab, cracks not only affect the structural bearing capacity but also cause the infiltration of moisture and corrosive media, exacerbating concrete carbonation and steel bar corrosion, seriously threatening the durability of the project. For the in-situ repair of concrete cracks, traditional techniques mainly include surface coating repair, grouting method, pasting steel plates or fiber cloth, etc.

[0003] The surface coating method seals the crack surface with materials such as epoxy resin. Although the operation is simple, it can only handle shallow surface cracks and cannot penetrate deep into the structure. Moreover, the bonding force between the coating and the concrete matrix is limited, and it is easy to fall off under the action of dynamic loads or concrete deformation, making it difficult to achieve long-term effective sealing. The grouting method injects materials such as resin into the cracks under pressure to fill internal defects. However, it depends on the penetration of the cracks. For cracks with complex orientations or bifurcations, it is difficult for the grouting material to be evenly distributed, and the toughness of a single grouting body is insufficient to adapt to the three-dimensional deformation of the concrete, and the cracks are prone to secondary expansion. The method of pasting steel plates or fiber cloth enhances the structural bearing capacity by external reinforcement. However, the steel plate has a large self-weight and the construction is cumbersome. Although the fiber cloth is light, its anti-peeling ability is weak. Moreover, both belong to passive reinforcement, which can only restrict the surface deformation of the cracks and cannot form an integral system that works together with the concrete to bear force, and the improvement of the stress concentration phenomenon around the cracks is limited. There is a risk of bonding interface failure during long-term use.

[0004] For the concrete slab road surfaces in heavy-load environments such as yards and roads, the existing repair techniques also face problems such as a long construction period and a great impact on normal operation. For example, traditional repair materials have a long curing time and are difficult to meet the requirements of quickly opening to traffic or goods turnover. Moreover, after reinforcement, the structural stiffness changes suddenly, and new stress concentration points are likely to occur at the interface between the new and old materials. In addition, the existing processes generally lack a multi-dimensional constraint mechanism for cracks, which can neither effectively disperse the complex stresses on the concrete surface nor easily achieve the deformation coordination of rigid-flexible combination and long-term sealing protection at the same time. As a result, the durability improvement effect of the repaired structure is limited under the dual action of long-term loads and environmental erosion.

[0005] Therefore, developing a crack reinforcement process that can be quickly constructed, takes into account structural reinforcement and sealing protection, and adapts to the three-dimensional deformation of concrete has become a key technical requirement for solving the problem of cracks on large-area concrete surfaces. Summary of the Invention

[0006] Aiming at the above deficiencies existing in the prior art, the purpose of the present invention is to solve the problems of troublesome repair, low efficiency, and poor stability after repair of cracks on the concrete slab surface. A rapid repair and reinforcement method for cracks on the concrete slab surface is provided. By constructing a fishbone-shaped network embedded reinforcement and sealing stress system, efficient repair and performance improvement of concrete cracks are realized, and the structural stability after repair is better.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: A rapid repair and reinforcement method for cracks on the concrete slab surface, characterized by including the following steps: 1) Cut the main crack, cut the crack along the length direction of the crack to be repaired on the concrete slab surface to form a main crack; 2) Cut the secondary cracks. Taking the extension direction of the main crack as the longitudinal direction, cut transverse secondary cracks on one side of the main crack at a set spacing. The transverse secondary cracks extend to the other side of the main crack after passing through the main crack, making the main crack and the secondary cracks form a fishbone shape as a whole; 3) Crack repair. Clean the main crack and the secondary cracks, then install corrugated steel bars in the secondary cracks, and simultaneously pour repair resin into the main crack and the secondary cracks. After the resin cures, a composite solid that deforms in coordination with the original concrete is formed to complete the crack repair.

[0008] Further, in step 3), during the crack cleaning process, the debris and dust in the main crack and the secondary cracks are sucked out by a high-pressure vacuum pump in cooperation with a hose nozzle; for larger stuck debris, it is taken out by a clip or a hook.

[0009] Further, in step 3), the length direction of the corrugated steel bar is consistent with the length direction of the secondary crack, its width direction is consistent with the depth direction of the secondary crack, and the corrugated steel bar penetrates the main crack.

[0010] Further, the repair resin is a high-strength repair resin.

[0011] Further, the spacing between adjacent transverse secondary cracks is 10 - 15 cm.

[0012] Further, the corrugated steel bar is a long strip-shaped sheet structure, and a number of concave and convex structures are alternately distributed along its length direction.

[0013] Compared with the prior art, the present invention has the following advantages: 1. The fishbone-shaped cut cracks form a planar network structure for stress dispersion through the longitudinal main crack and regularly arranged transverse secondary cracks, disperse the complex stress on the concrete slab surface along the vertical and horizontal cracks, and enhance the overall stress-bearing performance of the crack area; avoid the continuous expansion of cracks under the action of loads.

[0014] 2. Due to its high-strength elastic properties, the corrugated steel bar can effectively resist the three-dimensional stress deformation of concrete. The corrugated surface of the corrugated steel bar forms an interlocking structure with the poured high-strength repair resin, adapting to the size of the secondary joint. By multi-directionally bearing force, the stiffness of the anchor body is enhanced, significantly enhancing the stiffness of the embedded reinforced anchor body. The toughness of the resin and the steel bar cooperate to jointly restrain the late expansion of cracks, forming a deformation coordination embedded reinforcement mechanism of composite force, effectively restricting the deformation of concrete.

[0015] 3. After the high-strength repair resin fills the cut joint and cures, it forms a sealing layer, bonding the concrete and wrapping the steel bar, constructing a sealing and reinforcement system with the triple functions of stress dispersion, embedded reinforcement, and sealing protection. It not only completely fills the crack and bonds the surrounding concrete, blocking the erosion path of water and corrosive media, but also improves the durability of the concrete structure through sealing protection, inhibits the crack expansion, and realizes the structural reinforcement and durability improvement of the concrete slab crack. Brief Description of the Drawings

[0016] Figure 1 It is a top view of the main joint and the secondary joint in the present invention.

[0017] Figure 2 It is a structural schematic diagram of the corrugated steel bar.

[0018] Figure 3 It is a partial top view of the present invention after crack repair.

[0019] In the figure: 1 - concrete slab surface, 2 - main joint, 3 - secondary joint, 4 - corrugated steel bar, 5 - resin. Detailed Embodiment

[0020] The present invention will be further described below in conjunction with the drawings and embodiments.

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Therefore, the detailed description of the embodiments of the present invention provided in the drawings below is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance. In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Example: Refer to Figure 1 , Figure 2 and Figure 3 , a method for quickly repairing and strengthening cracks on the concrete slab surface, comprising the following steps: 1) Cut the main crack 2. Cut the crack along the length direction (i.e., the extension direction) of the crack to be repaired on the concrete slab surface 1 to form the main crack 2. During the implementation process, the length of the main crack 2 is the same as the length of the crack to be repaired, and the width and depth are constructed according to the set dimensions.

[0024] 2) Cut the secondary seam 3. Taking the extension direction of the main seam 2 as the longitudinal direction, cut the transverse secondary seam 3 on one side of the main seam 2 at a set spacing. The transverse secondary seam 3 extends through the main seam 2 to the other side of the main seam 2, making the overall shape of the main seam 2 and the secondary seam 3 like a fishbone. During the actual cutting process, the length, width, and depth of the secondary seam 3 are constructed according to the set dimensions. Preferably, the depth of the secondary seam 3 is the same as that of the main seam 2, thereby improving the integrity after seam repair. During implementation, the spacing between adjacent transverse secondary seams 3 is 10 - 15 cm, further improving the dispersion of the stress on the main seam 2 and enhancing the seam repair effect. In this solution, the main seam 2 and the secondary seam 3 together form a fishbone-shaped cut seam, constituting a planar network structure for stress dispersion and enhancing the overall mechanical properties of the crack area.

[0025] 3) Crack repair. Clean the main seam 2 and the secondary seam 3. During the cleaning process, use a high-pressure vacuum pump in cooperation with a hose nozzle to suck out the debris and dust in the main seam 2 and the secondary seam 3. For larger debris that is stuck, take it out with a clip or a hook. Then, install a corrugated steel bar 4 in the secondary seam 3. The corrugated steel bar 4 is a long strip-shaped sheet structure. Along its length direction, a number of concave and convex structures are alternately distributed on the corrugated steel bar 4. Among them, the corrugated steel bar 4 is obtained by cutting a corrugated steel plate. During implementation, the length direction of the corrugated steel bar 4 is the same as the length direction of the secondary seam 3, and its length is preferably the same as that of the secondary seam 3. The distance between its upper side and the surface of the concrete slab 1 is less than 2 cm. The width direction of the corrugated steel bar 4 is the same as the depth direction of the secondary seam 3 (that is, the concave and convex structures of the corrugated steel bar 4 fit the two sides of the secondary seam 3), and the corrugated steel bar 4 penetrates through the main seam 2. Then, pour the repair resin 5 into the main seam 2 and the secondary seam 3 simultaneously. After the resin 5 cures, it forms a composite reinforcement body that deforms synergistically with the original concrete, completing the crack repair. Among them, the repair resin 5 is a high-strength repair resin. In this way, the corrugated surface of the corrugated steel bar 4 and the poured high-strength repair resin 5 form an interlocking structure, adapting to the size of the secondary seam 3. By multi-directional stress, the stiffness of the anchor body is enhanced, effectively restricting the deformation of the concrete. The high-strength repair resin 5 fills the cut seam and cures to form a sealing layer, bonding the concrete and wrapping the steel bar, constructing a sealing and reinforcement system with triple functions of stress dispersion, embedded reinforcement, and sealing protection, inhibiting crack propagation, and realizing the reinforcement of the crack structure and the improvement of the durability of the concrete slab 1.

[0026] This solution achieves efficient crack repair through a triple mechanism: first, the fishbone-shaped mesh cutting system disperses the complex stress of the concrete slab 1 along the longitudinal and transverse seams, preventing the cracks from continuing to expand under load; second, the corrugated steel bars 4, with their high-strength elastic properties, effectively resist the three-dimensional stress deformation of the concrete. The interfacial bite structure formed by its wavy surface and the resin 5 significantly enhances the stiffness of the embedded reinforced anchor body, while the toughness of the resin 5 cooperates with the steel bars to restrain the later expansion of the cracks, forming a composite stress deformation coordinated embedded reinforcement mechanism; third, the continuous sealing layer formed after the resin 5 is cured not only completely fills the cracks and bonds to the surrounding concrete, blocking the erosion path of moisture and corrosive media, but also improves the durability of the concrete structure through sealing protection.

[0027] Compared with traditional repair technologies, this invention breaks through the limitations of single materials or simple structures. Through the systematic design of "stress dispersion + embedded reinforcement + sealing protection", it solves the problems of insufficient stress concentration treatment, poor deformation adaptability, and short sealing durability in existing processes. Especially in the repair of large concrete slab pavements in storage yards and roads under heavy load environments, this process can restore the bearing capacity of the slab structure in a short period of time and reduce the impact on normal operations by virtue of its advantages such as rapid construction (embedded steel bars in the seams, short curing time of the grouting resin 5), non-destructive reinforcement (cutting the seams does not damage the integrity of the original structure) and long-term sealing protection. The innovative mesh force system and composite reinforcement body design of this scheme provide a new solution for the structural repair of concrete cracks, combining engineering practicality with technological foresight.

[0028] As a specific embodiment: The rear yard and roadway of a coastal coal terminal utilize reinforced concrete slabs for surface treatment. These structures support coal loading, unloading, and transshipment, as well as the frequent passage of heavy vehicles. The slabs are 20 cm thick in the yard area and 25 cm thick in the roadway area, with a concrete strength of C30. Uneven settlement in some areas of the original foundation, combined with the dynamic loads from the coal stacks and transport vehicles, has caused severe cracks in some of the concrete slabs. The high humidity and salt spray environment of the coastal area exacerbates the risk of concrete carbonization and steel corrosion. These cracks not only weaken the structure's bearing capacity but also threaten its integrity. If not addressed promptly, they could seriously impact terminal operations and even cause accidents.

[0029] During the construction preparation phase, corrugated steel bars made of high-strength Q355 steel and measuring 15cm x 0.8cm x 3cm were selected. Their high strength and elasticity resist three-dimensional deformation of the concrete. The corrugated design forms a strong interlocking structure with the high-strength repair resin, enhancing the rigidity of the anchor. The high-strength repair resin possesses excellent adhesion, toughness, and rapid curing properties, tightly bonding with the concrete and steel bars to buffer stress, limit crack propagation, and shorten the construction period. Its special formula makes it suitable for the harsh coastal environment and effectively blocks media erosion. Furthermore, sealant is used to seal the crack edges, and a cleaner is used to ensure a clean construction interface, enhancing material bonding.

[0030] In terms of equipment preparation, professional high-precision circular saws are equipped with guide and depth control systems, the cutting blades are wear-resistant, and can accurately cut fishbone-shaped mesh slits; high-power high-pressure vacuum suction pumps are equipped with special hose nozzles and wire hooks to completely remove impurities in the slits; special resin infusion equipment can accurately control the infusion volume and pressure to ensure uniform resin filling.

[0031] The construction process is rigorous and methodical. First, construction workers use a level and a steel ruler to mark the longitudinal main seam and transverse secondary seam according to the crack's direction, ensuring that the main seam and the crack overlap, with a spacing of 10-15 cm between the secondary seams. The operator then starts the circular saw, controlling the speed and depth to achieve a seam depth of 5-7 cm and a width of 1.0-1.2 cm. Dust reduction measures are implemented throughout the process to ensure a clean, regular seam. Immediately after cutting, impurities are removed from the seam using a vacuum pump and a wire hook. After quality inspection, corrugated steel strips are installed in the secondary seams, ensuring a tight fit and a minimum of 2 cm from the panel surface. Positioning and verticality are then checked. Next, high-strength repair resin is poured simultaneously with the steel strips, precisely controlling the pressure and speed to ensure the resin fills the seam completely without bubbles. After pouring, the surface is trimmed. Finally, warning signs are set up, and according to resin curing requirements and the ambient temperature and humidity, measures such as covering with film and applying water are implemented to ensure the resin is fully cured.

[0032] Quality inspection and acceptance ensure project quality from multiple perspectives. Appearance inspections focus on the shape and dimensions of the cuts, the placement of the steel bars, and the condition of the resin surface. Strength testing involves compression testing of core samples after the resin has cured. After the construction unit passes self-inspection, the construction company organizes a multi-party acceptance inspection based on standards, reviews the test results, and examines the construction materials. Upon approval, the project is signed and commissioned. This process, leveraging scientific procedures and rigorous quality control, successfully repairs cracks, restores the structure's bearing capacity, and enhances durability, setting a high-quality example for similar projects.

[0033] From the successful treatment of the cracks in the concrete slab in the embodiments, it can be seen that the rapid reinforcement and repair technology for the cracks on the concrete slab surface has significant advantages. In terms of structural design, the fishbone-shaped mesh cutting seams disperse stress and avoid secondary damage; the corrugated steel bars and high-strength resin cooperate to enhance the stiffness of the anchor body and restrain the crack expansion. In terms of material properties, the resin cures to form a sealing layer, blocking the erosion of the medium and improving the durability. In terms of construction efficiency, the resin cures quickly, the construction period is short, the impact on operation is small, and the cutting seams do not damage the original structure. This technology breaks through the traditional limitations and provides an innovative solution for the structural repair of concrete cracks through systematic design of "stress dispersion + embedded reinforcement + sealing protection" to solve problems such as stress concentration and poor deformation adaptability.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those of ordinary skill in the art should understand that any modifications or equivalent replacements made to the technical solutions of the present invention without departing from the purpose and scope of the present technical solution shall be covered by the scope of the claims of the present invention.

Claims

1. A rapid repair and reinforcement method for cracks on the concrete slab surface, characterized in that, It includes the following steps: 1) Cut the main crack. Cut the crack along the length direction of the crack to be repaired on the concrete slab surface to form the main crack; 2) Cut the secondary cracks. Taking the extension direction of the main crack as the longitudinal direction, cut transverse secondary cracks on one side of the main crack at a set spacing. The transverse secondary cracks pass through the main crack and extend to the other side of the main crack, making the overall shape of the main crack and the secondary cracks like a fishbone; 3) Crack repair. Clean the main crack and the secondary cracks, then install corrugated steel bars in the secondary cracks, and simultaneously pour repair resin into the main crack and the secondary cracks. Wait for the resin to cure to form a composite solid that deforms synergistically with the original concrete to complete the crack repair.

2. A rapid repair and reinforcement method for cracks on a concrete slab surface according to claim 1, characterized in that, In step 3), during the cleaning process, use a high-pressure vacuum pump in cooperation with a hose nozzle to suck out the debris and dust in the main crack and the secondary cracks; for larger stuck debris, take it out with a clip or a hook.

3. A rapid repair and reinforcement method for cracks on the concrete slab surface according to claim 1, characterized in that, In step 3), the length direction of the corrugated steel bar is consistent with the length direction of the secondary crack, its width direction is consistent with the depth direction of the secondary crack, and the corrugated steel bar penetrates the main crack.

4. A rapid repair and reinforcement method for concrete slab cracks according to claim 1, characterized in that, The repair resin is a high-strength repair resin.

5. A rapid repair and reinforcement method for cracks on the concrete slab surface according to claim 1, characterized in that, The spacing between adjacent transverse secondary cracks is 10 - 15 cm.

6. A rapid repair and reinforcement method for cracks on the concrete slab surface according to claim 1, characterized in that, The corrugated steel bar is a long strip-shaped sheet structure, and a number of concave and convex structures are alternately distributed along its length direction on the corrugated steel bar.

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