Structural crack maintenance method

Abstract

The invention relates to the field of building waterproof construction, and discloses a structural crack maintenance method which comprises the steps that the surface of a crack of a structure is blocked, and a ventilation connector communicating the crack with the outside is arranged; drilling holes in the structure to form a deep grouting channel and a shallow grouting channel which are mutually independent, wherein the deep grouting channel and the shallow grouting channel extend to a deep area and a shallow area of the crack respectively; high-pressure gas is injected into the shallow layer area through the shallow layer grouting channel; after the shallow layer area is filled with the high-pressure gas, fast curing grouting liquid is injected into the deep layer area through the deep layer grouting channel; and after the deep layer area is filled with the fast curing grouting liquid and the fast curing grouting liquid is completely cured, stopping injecting the high-pressure gas into the shallow layer area, and injecting the long-acting curing grouting liquid into the shallow layer area through the shallow layer grouting channel, so that the shallow layer area is filled with the long-acting curing grouting liquid and the long-acting curing grouting liquid is completely cured. The structural crack maintenance method disclosed by the invention has a good anti-seepage maintenance effect.

Description

Technical Field

[0001] The present invention belongs to the field of building waterproof construction, and specifically relates to a method for repairing structural cracks. Background Art

[0002] Traditional structural crack repair techniques generally use a single polyurethane grouting liquid, which has significant defects: its insufficient water resistance leads to easy recurrence of leakage in high-humidity environments, poor anti-aging performance causes brittle cracking and failure of materials, and curing shrinkage easily forms secondary cracks. It is difficult to quickly consolidate in dynamic water and gushing water conditions, and the deformation joint part cannot adapt to structural deformation. Although high-permeability modified epoxy resin has excellent permeability, adhesion strength and environmental adaptability, its slow curing rate makes it easy to be diluted and washed away by water flow in cracks with water pressure, and rapid plugging cannot be achieved. Existing single-material systems are difficult to balance the technical contradiction between rapid consolidation and long-term durability in complex working conditions, resulting in poor anti-seepage repair effects for structural cracks. Summary of the Invention

[0003] In view of the above deficiencies or defects in the prior art, the present invention provides a method for repairing structural cracks, which has good anti-seepage repair effects.

[0004] To achieve the above object, the present invention provides a method for repairing structural cracks, including the following steps:

[0005] Step S1. Seal the surface of the crack of the structure and set a ventilation interface communicating the crack with the outside;

[0006] Step S2. Drill holes in the structure to form independent deep grouting channels and shallow grouting channels, the deep grouting channels extend to the deep area of the crack, and the shallow grouting channels extend to the shallow area of the crack;

[0007] Step S3. Inject high-pressure gas into the shallow area through the shallow grouting channel;

[0008] Step S4. After the high-pressure gas fills the shallow area, inject a fast-curing grouting liquid into the deep area through the deep grouting channel, and use the high-pressure gas filling the shallow area to restrict the diffusion of the fast-curing grouting liquid to the shallow area;

[0009] Step S5. After the fast-curing grouting liquid fills the deep area and is completely cured, stop injecting the high-pressure gas into the shallow area, and inject a long-term curing grouting liquid into the shallow area through the shallow grouting channel, so that the long-term curing grouting liquid fills the shallow area and is completely cured.

[0010] Optionally, the step S1 includes:

[0011] A groove is formed on the surface of the crack, and a π-shaped hose with an opening communicating with the crack in alignment is buried in the groove. An air vent interface communicating with the inside of the π-shaped hose and extending out of the notch of the groove is arranged on the π-shaped hose, and the notch of the groove is sealed.

[0012] The step S3 includes:

[0013] Inject the high-pressure gas into the shallow layer area through the shallow grouting channel and the π-shaped hose.

[0014] Optionally, the step S1 includes:

[0015] After burying the π-shaped hose, a water-swellable waterstop strip is embedded between the side of the π-shaped hose facing away from the crack and the two side walls of the groove. After the embedding is completed, the notch of the groove is sealed with epoxy mortar.

[0016] Optionally, the step S3 includes:

[0017] Drill a hole at a position on the structure near the crack to form a test hole penetrating the structure, detect the water pressure outside the structure through the test hole, and make the injection pressure of the high-pressure gas greater than the water pressure outside the structure.

[0018] Optionally, the step S4 includes:

[0019] Before injecting the fast-curing grouting liquid into the deep layer area through the deep grouting channel, detect the gas pressure overflowing from the deep grouting channel, and make the injection pressure of the fast-curing grouting greater than the gas pressure overflowing from the deep grouting channel and less than the injection pressure of the high-pressure gas.

[0020] Optionally, the step S4 includes:

[0021] During the process of injecting the fast-curing grouting liquid into the deep layer area, when slurry overflows from adjacent deep grouting channels or the injection volume of the fast-curing grouting liquid reaches 1.2 times the volume of the crack, stop injecting the fast-curing grouting liquid into the deep layer area.

[0022] Optionally, the step S4 includes:

[0023] After stopping the injection of the fast-curing grouting liquid into the deep area and waiting for a preset duration, stop injecting the high-pressure gas into the shallow area, and observe whether there is water overflow from the crack. If there is no water overflow, it proves that the fast-curing grouting liquid fills the deep area and is completely cured. If there is water overflow, resume injecting the high-pressure gas into the shallow area and continue injecting the fast-curing grouting liquid into the deep area until the fast-curing grouting liquid fills the deep area and is completely cured.

[0024] Optionally, step S1 includes:

[0025] After sealing the surface of the crack, verify the tightness of the crack surface through a pneumatic test or a water injection test.

[0026] Optionally, the depth of the deep grouting channel is 1 / 2 to 2 / 3 of the structural thickness, and the depth of the shallow grouting channel is less than 1 / 2 of the structural thickness.

[0027] Optionally, the fast-curing grouting liquid is a polyurethane grouting liquid, and the long-term curing grouting liquid is a polyurea grouting liquid or an epoxy grouting liquid.

[0028] Through the above technical solution, in the structural crack repair method of the present invention, first drill holes in the structure to form independent deep grouting channels and shallow grouting channels. The deep grouting channels extend to the deep area of the crack, and the shallow grouting channels extend to the shallow area of the crack. Inject high-pressure gas into the shallow area through the shallow grouting channels. After the high-pressure gas fills the shallow area, then inject the fast-curing grouting liquid into the deep area through the deep grouting channels. Use the high-pressure gas filled in the shallow area to restrict the diffusion of the fast-curing grouting liquid to the shallow area. After the fast-curing grouting liquid fills the deep area and is completely cured, stop injecting the high-pressure gas into the shallow area, and inject the long-term curing grouting liquid into the shallow area through the shallow grouting channels, so that the long-term curing grouting liquid fills the shallow area and is completely cured. With such a setting, that is, using the characteristic that the fast-curing grouting liquid can be quickly cured, first quickly stop the clear water in the deep area of the crack to provide a static water environment for the grouting and water stopping in the shallow area of the crack, so that the long-term curing grouting liquid has sufficient time to cure after being injected into the shallow area of the crack, thereby exerting its long-term water-stopping characteristic. In this way, the anti-seepage repair effect on the structural crack can be significantly improved.

[0029] Other features and advantages of the present invention will be described in detail in the subsequent specific embodiment part. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention.

[0031] In the accompanying drawings:

[0032] Figure 1 is a structural schematic diagram of the structural crack repair in a specific embodiment of the present invention;

[0033] Figure 2 is Figure 1 a grouting schematic diagram of the structural crack repair in;

[0034] Figure 3 is a flowchart of the structural crack repair method in a specific embodiment of the present invention;

[0035] Figure 4 is Figure 1 a structural schematic diagram of the π-shaped hose in.

[0036] Explanation of reference numerals:

[0037] 1 Structure

[0038] 2 Crack

[0039] 3 Deep grouting channel

[0040] 4 Shallow grouting channel

[0041] 5 π-shaped hose

[0042] 6 Water-swellable waterstop Detailed description of specific embodiments

[0043] The following is a detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0044] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0045] In the present invention, unless otherwise stated, directional terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. usually refer to the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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 should not be construed as a limitation to the embodiments of the present invention; the directional terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0046] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0047] An exemplary embodiment of the present invention provides a method for repairing structural cracks. Referring to the attached Figure 1 to the attached Figure 3 As shown, the method for repairing structural cracks includes the following steps:

[0048] Step S1. Seal the surface of the crack 2 of the structure 1 and set a ventilation interface connecting the crack 2 and the outside;

[0049] Step S2. Drill holes in the structure 1 to form independent deep grouting channels 3 and shallow grouting channels 4. The deep grouting channel 3 extends to the deep area of the crack 2, and the shallow grouting channel 4 extends to the shallow area of the crack 2;

[0050] Step S3. Inject high-pressure gas into the shallow area through the shallow grouting channel 4;

[0051] Step S4. After the high-pressure gas fills the shallow area, inject a fast-curing grouting liquid into the deep area through the deep grouting channel 3, and use the high-pressure gas filling the shallow area to limit the diffusion of the fast-curing grouting liquid to the shallow area;

[0052] Step S5. After the fast-curing grouting liquid fills the deep area and is completely cured, stop injecting high-pressure gas into the shallow area, and inject a long-term curing grouting liquid into the shallow area through the shallow grouting channel 4, so that the long-term curing grouting liquid fills the shallow area and is completely cured.

[0053] In the method for repairing the crack 2 of the structure 1 in the exemplary embodiment, first drill holes in the structure 1 to form independent deep grouting channels 3 and shallow grouting channels 4. The deep grouting channel 3 extends to the deep area of the crack 2, and the shallow grouting channel 4 extends to the shallow area of the crack 2. Inject high-pressure gas into the shallow area through the shallow grouting channel 4. After the high-pressure gas fills the shallow area, inject a fast-curing grouting liquid into the deep area through the deep grouting channel 3, and use the high-pressure gas filling the shallow area to limit the diffusion of the fast-curing grouting liquid to the shallow area. After the fast-curing grouting liquid fills the deep area and is completely cured, stop injecting high-pressure gas into the shallow area, and inject a long-term curing grouting liquid into the shallow area through the shallow grouting channel 4, so that the long-term curing grouting liquid fills the shallow area and is completely cured. With such a setting, that is, using the characteristic that the fast-curing grouting liquid can be quickly cured, first quickly stop the clear water in the deep area of the crack 2 to provide a static water environment for the grouting and water stopping in the shallow area of the crack 2, so that the long-term curing grouting liquid has sufficient time to cure after being injected into the shallow area of the crack 2, thereby exerting its long-term water-stopping characteristic. In this way, the anti-seepage repair effect of the crack 2 of the structure 1 can be significantly improved.

[0054] Specifically, grouting nozzles can be buried at the orifices of the deep grouting channel 3 and the shallow grouting channel 4. During actual application, the grouting machine is connected to the grouting nozzles. In this way, the grouting machine can inject grout into the shallow and deep regions of the crack 2 through the deep grouting channel 3 and the shallow grouting channel 4 respectively. Additionally, when high-pressure gas needs to be injected into the shallow region through the shallow grouting channel 4, an air compressor can be used to connect to the grouting nozzle at the orifice of the shallow grouting channel 4.

[0055] During actual application, generally, multiple groups of deep grouting channels 3 and shallow grouting channels 4 are arranged at intervals along the length direction of the crack 2, and the above steps are repeated to grout and stop water for the entire crack 2.

[0056] It can be understood that during the process of injecting the long-acting curing grout into the shallow region, the gas in the shallow region can be discharged to the outside through the ventilation interface.

[0057] In this embodiment, the structural crack repair method may further include:

[0058] Step S6. After the long-acting curing grout fills the shallow region and completely cures, chisel the grouting nozzles of the shallow grouting channel, the grouting nozzles of the deep grouting channel, and the ventilation interface, and perform a sealing treatment with epoxy sealing mortar, and restore the finishing layer at this place according to the original design.

[0059] In an alternative embodiment, step S1 includes:

[0060] Open a groove on the surface of the crack 2, bury a π-shaped hose 5 with an opening communicating with the crack 2 in the groove, set a ventilation interface on the π-shaped hose 5 that communicates with its interior and extends out of the groove opening, and seal the groove opening;

[0061] Step S3 includes:

[0062] Inject high-pressure gas into the shallow region through the shallow grouting channel 4 and the π-shaped hose 5.

[0063] In this embodiment, the π-shaped hose 5 and the groove enclose a closed cavity, and the closed cavity communicates with the crack. This setting effectively improves the uniformity of injecting high-pressure gas into the shallow region, ensures that the high-pressure gas can fill the shallow region, and prevents the rapid-curing grout from spreading to the shallow region.

[0064] Specifically, referring to the appendix Figure 4As shown, the π-shaped hose 5 includes an arc portion with an arc-shaped cross-section and straight portions extending outward in opposite directions from opposite sides of the arc portion. In actual application, the straight portions of the π-shaped hose 5 are abutted against the bottom wall of the groove, and the opening of the arc portion of the π-shaped hose 5 is aligned and communicated with the crack 2 to form a closed cavity; in addition, the π-shaped hose 5 further includes a plurality of ventilation interfaces that are communicated with the arc portion and extend toward the side away from the opening, and the plurality of ventilation interfaces are evenly arranged along the length direction of the arc portion.

[0065] In actual application, the specific operations for opening the groove and installing the π-shaped hose 5 are as follows:

[0066] First, remove the loose materials: Use tools such as chisels, hammers, shovels, etc. to remove sundries such as loose concrete, mortar blocks, and stones inside the surface of the crack. For larger loose materials, they can be first broken into smaller pieces with a chisel or a hammer, and a special drill bit or shovel can be installed using an electric drill or a pneumatic tool to remove them. The grooving depth is based on the upper surface of the steel bars of the structure 1, and the steel bars of the structure 1 shall not be damaged.

[0067] Then, clean the dust and impurities: Use a high-pressure air gun or a vacuum cleaner to comprehensively blow or suck the groove to remove fine impurities such as residual dust, sand grains, and wood chips inside the groove. At the same time, the groove should be blown from multiple angles to ensure that the dust and impurities inside the groove are completely removed. In addition, during the cleaning process, the cleaning situation inside the groove should be continuously checked to ensure that the dust and impurities inside the groove are completely removed.

[0068] Finally, install the π-shaped hose 5: Align the opening direction of the π-shaped hose 5 with the crack and fix it point by point with epoxy mortar. Leave a ventilation interface for the hose at intervals of 500 mm, and install a pressure relief valve on the ventilation interface.

[0069] In an alternative embodiment, step S1 includes:

[0070] After burying the π-shaped hose 5, embed a water-swelling sealing strip 6 between the side of the π-shaped hose 5 facing away from the crack 2 and the two side walls of the groove. After the embedding is completed, seal the notch of the groove with epoxy mortar.

[0071] In this embodiment, by embedding a water-swelling sealing strip 6 between the side of the π-shaped hose 5 facing away from the crack 2 and the two side walls of the groove, in this way, the sealing performance and waterproof effect of the crack 2 can be further improved.

[0072] In actual application, the specific operations for installing the water-swelling sealing strip 6 are as follows:

[0073] According to the width of the crack and the specifications of the water-swelling waterstop strip 6, installation control lines are snapped on the structural surfaces on both sides of the crack to ensure the accurate installation position of the water-swelling waterstop strip 6. For the installation of the water-swelling waterstop strip 6, first, the water-swelling waterstop strip 6 is unfolded along the length direction of the crack, so that the center of the water-swelling waterstop strip 6 is aligned with the center of the crack. Then, both sides of the water-swelling waterstop strip 6 are respectively embedded into the grooves. During the embedding process, it is necessary to pay attention to compacting the water-swelling waterstop strip 6 to make it fully contact with the inner wall of the groove to avoid air pockets or bubbles. After the embedding is completed, epoxy mortar is used to seal the gaps in the grooves to ensure good sealing performance between the water-swelling waterstop strip 6 and the surface of the structure 1.

[0074] In an alternative embodiment, step S3 includes:

[0075] Drill holes at positions on the structure 1 near the crack 2 to form test holes penetrating the structure 1, and detect the water pressure on the outer side of the structure 1 through the test holes, so that the injection pressure of the high-pressure gas is greater than the water pressure on the outer side of the structure 1.

[0076] In this embodiment, by making the injection pressure of the high-pressure gas greater than the water pressure on the outer side of the structure 1, it can be ensured that the high-pressure gas can be smoothly injected to fill the shallow area and form an air barrier that can block the entry of grout and seepage water.

[0077] During actual application, a waterstop valve is installed in the test hole, and a pressure sensor is set at the outlet of the test hole, so as to test the magnitude of the water pressure on the outer side of the structure 1 through the test hole.

[0078] In an alternative embodiment, step S4 includes:

[0079] Before injecting the fast-curing grouting liquid into the deep area through the deep grouting channel 3, detect the gas pressure overflowing from the deep grouting channel 3, so that the injection pressure of the injected fast-curing grouting is greater than the gas pressure overflowing from the deep grouting channel 3 and less than the injection pressure of the high-pressure gas.

[0080] In this embodiment, by making the injection pressure of the injected fast-curing grouting greater than the gas pressure overflowing from the deep grouting channel 3 and less than the injection pressure of the high-pressure gas, it can be ensured that when injecting the fast-curing grouting liquid into the deep area through the deep grouting channel 3, the fast-curing grouting liquid can be smoothly injected to fill the deep area, and can be blocked by the high-pressure gas in the shallow area. At the same time, the clear water in the deep area can be pushed to the outside of the structure 1.

[0081] In an alternative embodiment, step S4 includes:

[0082] During the process of injecting the fast-curing grouting liquid into the deep area, when slurry overflows from the adjacent deep grouting channel 3 or the injection volume of the fast-curing grouting liquid reaches 1.2 times the volume of the crack 2, stop injecting the fast-curing grouting liquid into the deep area.

[0083] Specifically, the volume of the crack 2 can be estimated by the following formula: the width of the crack 2 × the depth of the crack 2 × the density of the fast-curing grouting liquid.

[0084] In an alternative embodiment, step S4 includes:

[0085] After stopping injecting the fast-curing grouting liquid into the deep area and waiting for a preset duration, stop injecting high-pressure gas into the shallow area, and observe whether there is water overflow from the crack 2. If there is no water overflow, it proves that the fast-curing grouting liquid fills the deep area and is completely cured. If there is water overflow, resume injecting high-pressure gas into the shallow area and continue injecting the fast-curing grouting liquid into the deep area until the fast-curing grouting liquid fills the deep area and is completely cured.

[0086] In this way, it can be reliably ensured that the fast-curing grouting liquid fills the deep area and is completely cured, providing a reliable static water environment for subsequent grouting and water stoppage in the shallow area.

[0087] In an alternative embodiment, step S1 includes:

[0088] After sealing the surface of the crack 2, verify the tightness of the surface of the crack 2 through air pressure testing or water injection testing.

[0089] In this way, the tightness of the surface of the crack 2 can be ensured, providing a reliable sealing environment for subsequent grouting repair.

[0090] In actual application, the specific operations of air pressure testing and water injection testing are as follows:

[0091] Air pressure testing: Use special airtight detection equipment, such as an airtightness tester, a pressure sensor, etc. Connect the test head of the equipment to the surface of the crack 2, and then inject gas at a certain pressure, and observe the pressure change. Generally, within a specified time (such as 5 - 10 minutes), if the pressure drop does not exceed the specified value (such as 0.05 - 0.1 MPa), it is considered that the sealing performance is good; if the pressure drop exceeds the specified value, it means that there is a problem with poor sealing, and the leakage point needs to be found and corresponding repair measures need to be taken.

[0092] Water injection test: Applicable to structural cracks with high waterproof requirements, such as construction joints and deformation joints in basements, water tanks, tunnels and other parts. Before the water injection test, both ends of the closed part of the crack 2 surface are blocked with temporary blocking materials (such as rubber plugs, wooden boards, etc.) to ensure that the closed space forms a relatively independent cavity. Then, a certain amount of water is injected to make the water surface height reach the design requirement or the specified test height (such as 10-20 cm higher than the top of the crack 2). During the water injection process, pay attention to observing whether there is water seepage on the surface of the crack 2. If there is water seepage, make a mark in time and stop the water injection. After the water injection is completed, observe for a certain period of time (such as 24-48 hours) to check whether there is leakage on the surface of the crack 2. If there is no leakage on the surface of the crack 2 within the specified time, it is considered that the sealing performance is good; if leakage is found, the surface of the crack 2 needs to be carefully inspected to find the leakage point and take corresponding repair measures.

[0093] During the sealing performance inspection process, if it is found that there is a problem of poor sealing, corresponding repair measures should be taken according to the specific situation. For small leakage points, sealant or waterproof mortar can be used to block and repair the leakage points; for large leakage points or areas with poor sealing, it may be necessary to remove some of the closed materials or water stop strips, and re-close or install water stop strips to ensure good sealing performance on the surface of the crack 2 and meet the requirements of waterproofing and anti-seepage.

[0094] In an alternative embodiment, the depth of the deep grouting channel 3 is 1 / 2 to 2 / 3 of the thickness of the structure 1, and the depth of the shallow grouting channel 4 is less than 1 / 2 of the thickness of the structure 1. With this setting, the fast-curing grouting liquid will spread to both sides in the crack 2. The spread of the grouting liquid to the shallow area will be blocked by the high-pressure gas in the shallow area, while it can spread unobstructed to the outside of the structure 1 to fill the deep area.

[0095] In an alternative embodiment, the fast-curing grouting liquid is polyurethane grouting liquid, and the long-acting curing grouting liquid is polyurea grouting liquid or epoxy grouting liquid.

[0096] It can be understood that the polyurethane grouting liquid has the advantage of fast curing speed but poor water resistance, while the polyurea grouting liquid or epoxy grouting liquid has the advantages of room temperature curing, low viscosity, good permeability, strong bonding ability, high mechanical strength of the consolidated body, extremely strong toughness, effective curing and bonding in humid base surfaces and underwater, and high chemical stability against cracking. However, the curing has high requirements for time and environment. In this embodiment, the advantages of both can be fully utilized and their respective disadvantages can be complemented. In this way, the anti-seepage repair effect on the crack 2 of the structure 1 can be significantly improved.

[0097] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0098] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. 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.

[0099] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0100] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for repairing structural cracks, characterized in that, It includes the following steps: Step S1. Seal the crack surface of the structure and set a ventilation interface connecting the crack and the outside; Step S2. Drill holes in the structure to form independent deep grouting channels and shallow grouting channels. The deep grouting channels extend to the deep area of the crack, and the shallow grouting channels extend to the shallow area of the crack; Step S3. Inject high-pressure gas into the shallow area through the shallow grouting channel; Step S4. After the high-pressure gas fills the shallow area, inject a fast-curing grouting liquid into the deep area through the deep grouting channel, and use the high-pressure gas filling the shallow area to restrict the fast-curing grouting liquid from spreading to the shallow area; Step S5. After the fast-curing grouting liquid fills the deep area and completely cures, stop injecting the high-pressure gas into the shallow area, and inject a long-term curing grouting liquid into the shallow area through the shallow grouting channel, so that the long-term curing grouting liquid fills the shallow area and completely cures.

2. The structural crack repair method according to claim 1, characterized in that, The step S1 includes: Open a groove on the surface of the crack, bury a π-shaped hose with an opening in the groove communicating with the crack in position, set the ventilation interface on the π-shaped hose communicating with its interior and extending out of the notch of the groove, and seal the notch of the groove; The step S3 includes: Inject the high-pressure gas into the shallow area through the shallow grouting channel and the π-shaped hose.

3. The structural crack repair method according to claim 2, wherein The step S1 includes: After burying the π-shaped hose, embed a water-swelling water stop strip between the side of the π-shaped hose facing away from the crack and the two side walls of the groove. After embedding, use epoxy mortar to seal the notch of the groove.

4. The structural crack repair method according to claim 1, characterized in that The step S3 includes: Drill a hole at a position near the crack on the structure to form a test hole penetrating the structure, detect the water pressure on the outside of the structure through the test hole, and make the injection pressure of the high-pressure gas greater than the water pressure on the outside of the structure.

5. The structural crack repair method according to claim 4, characterized in that, The step S4 includes: Before injecting the fast-curing grouting liquid into the deep area through the deep grouting channel, detect the gas pressure overflowing from the deep grouting channel, and make the injection pressure of the fast-curing grouting greater than the gas pressure overflowing from the deep grouting channel and less than the injection pressure of the high-pressure gas.

6. The structural crack repair method according to claim 1, characterized in that, The step S4 includes: During the process of injecting the fast-curing grouting liquid into the deep area, when slurry overflows from adjacent deep grouting channels or the injection volume of the fast-curing grouting liquid reaches 1.2 times the volume of the crack, stop injecting the fast-curing grouting liquid into the deep area.

7. The structural crack repair method according to claim 6, characterized in that, The step S4 includes: After stopping the injection of the fast-curing grouting liquid into the deep area and waiting for a preset duration, stop injecting the high-pressure gas into the shallow area, and observe whether there is water overflowing from the crack. If there is no water overflow, it proves that the fast-curing grouting liquid fills the deep area and is completely cured. If there is water overflow, resume injecting the high-pressure gas into the shallow area and continue injecting the fast-curing grouting liquid into the deep area until the fast-curing grouting liquid fills the deep area and is completely cured.

8. The structural crack repair method according to claim 1, characterized in that, The step S1 includes: After sealing the surface of the crack, verify the tightness of the crack surface through air pressure testing or water injection testing.

9. The structural crack repair method according to claim 1, characterized in that, The depth of the deep grouting channel is 1 / 2 to 2 / 3 of the thickness of the structure, and the depth of the shallow grouting channel is less than 1 / 2 of the thickness of the structure.

10. The structural crack repair method according to claim 1, characterized in that, The fast-curing grouting liquid is a polyurethane grouting liquid, and the long-term curing grouting liquid is a polyurea grouting liquid or an epoxy grouting liquid.

Images