CN115467550A - Concrete crack repairing method - Google Patents

Abstract

The invention discloses a method for repairing concrete cracks, which comprises the following steps: S1, crack pretreatment; S2, crack pouring; S3, crack sealing; S4, curing. The invention solves the problem of not cleaning the floating dust and dust in the cracks in the traditional crack repairing process, and ensures the perfusion of the cracks from the source.

Description

A method for repairing cracks in concrete

technical field

The invention relates to the technical field of civil engineering. More specifically, the present invention relates to a method for repairing cracks in concrete.

Background technique

Concrete is the most widely used building material in the field of modern civil engineering. However, most of the concrete is exposed to the outdoor environment for a long time, and it has a porous structure. Water and ions can penetrate into the interior through its pores, causing moldy, Carbonation, cracking and other diseases, the existence of cracks will further lead to corrosion of steel bars, seriously affect the normal use of concrete structures, reduce the bearing capacity of concrete structures, and even lead to structural damage of concrete, so cracks need to be dealt with in a timely manner.

At present, the methods of repairing concrete cracks mainly include:

1. Surface sealing method. This method cuts the groove along the direction of the crack through the equipment. According to the position of the groove, remove the sundries in the crack with a steel brush, clean both sides of the crack, scrape the crack and press to seal the crack Glue to repair cracks;

2. Automatic low-pressure infiltration method. After treating the surface of the crack, paste and fix the grouting nozzle along the center of the crack according to the set interval. The pressure continues to infiltrate into the cracks to repair the cracks;

3. Pressure grouting method. After treating the cracks, the grouting nozzles are arranged along the direction of the cracks, and the grouting nozzles are used to inject grout into the cracks to realize the repair of the cracks;

The above three methods do not perform any treatment on the inside of the crack, and when there is a lot of dust and dust in the crack, it will lead to unsatisfactory subsequent pouring and sealing effects, which will eventually affect the repair effect of the concrete crack.

Contents of the invention

Another purpose of the present invention is to provide a concrete crack repair method that can solve the problem of not cleaning the floating dust and dust in the crack during the traditional crack repair process, and ensure the pourability of the crack from the source.

In order to achieve these objects and other advantages according to the present invention, a method for repairing concrete cracks is provided, comprising the following steps:

S1, crack pretreatment;

S11, use high-pressure air to clean the floating dust on the surface of the crack;

S12. Install a pouring device at the left end of the crack, fill the pouring device with water, and the water will automatically flow into the crack under the action of its own gravity;

S13. A plurality of vacuuming points are arranged at intervals along the length of the crack, and any vacuuming point is equipped with a vacuuming device. When water flows into the crack, the negative pressure at the vacuuming point is evacuated sequentially from left to right. , when the vacuum device pumps out the water, stop working, and carry out vacuuming at the next vacuuming point until the water fills the entire crack;

S14, continuously pouring water and performing negative pressure vacuuming at the last vacuuming point until the vacuuming device pumps out water;

S15. Use an air compressor to press high-pressure air into the crack at the pouring device, and the vacuum device continues to vacuumize under negative pressure until no water is drawn out from the crack;

S16, use a film to cover the cracks, and perform follow-up operations after it dries for 5-7 days;

S2, crack filling;

Replace the water inside the perfusion device with epoxy glue, and repeat steps S11-S13;

S3, crack sealing;

When the surface of the crack is covered with glue, cover the crack with a plastic film, and the part where the plastic film contacts the concrete surface is filled with glue;

S4, maintenance;

Continue pouring epoxy resin glue and vacuuming for 1 minute. When there is no cavity in the contact part of the plastic film and the concrete surface, turn off the vacuuming device and keep more than half of the epoxy resin glue in the pouring device. After the glue is cured, keep on-site continuous maintenance for 7 days before opening.

Preferably, in the step S2, when pouring the epoxy resin glue into the crack, the contact surface tension T of the epoxy resin glue and the concrete contact angle θ should satisfy 0.05≤2Tcosθ.

Preferably, in the step S3, when the surface of the crack is not covered with glue, use an injection device to coat the surface of the crack with glue, and then cover the crack with a plastic film from left to right, and observe while covering. When there is a void in the contact part of the plastic film and the concrete surface, lift the plastic film and continue to fill it with glue and cover it again until the entire crack is covered and the contact part of the plastic film and the concrete surface is filled with glue.

Preferably, the thickness of the plastic film is not less than 0.05 mm.

Preferably, in the step S13, the vacuum negative pressure is 0-0.1 MPa; in the step S15, the high-pressure air pressure is not lower than 2 MPa.

Preferably, in the step S12, a pressure of 0-10 MPa is used to assist perfusion.

Preferably, in the step S12, the contact part between the bottom of the pouring device and the concrete surface is in a sealed state.

Preferably, during the repairing process of the cracks, the cracks are reinforced by pasting carbon fiber sheet materials to ensure that the cracks will not crack again during the repairing process.

The present invention at least includes the following beneficial effects:

1. The present invention solves the problem of not cleaning the floating dust and dust in the cracks during the traditional crack repair process, and ensures the perfusion of the cracks from the source;

2. The present invention sets the contact angle between the pouring material and the concrete, so that the pouring material can also penetrate into the crack under the action of its own gravity without pressure, which further ensures the pourability of the crack ;

3. The crack repair method of the present invention is a major innovation to the traditional crack repair method, which provides a reasonable and effective repair technology for cracks in concrete engineering, is applicable to concrete repair in various scenarios, and can greatly reduce structural risks.

Other advantages, objectives and features of the present invention will partly be embodied through the following descriptions, and partly will be understood by those skilled in the art through the study and practice of the present invention.

Description of drawings

Fig. 1 is the arrangement position schematic diagram of vacuum point of the present invention;

Fig. 2 is a schematic diagram of the perfusion process of the present invention;

Fig. 3 is a schematic diagram of the completion of perfusion in the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

It should be noted that, in the description of the present invention, the terms "horizontal", "vertical", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and It is not to indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, or operate in a particular orientation, and thus should not be construed as limiting the invention.

As shown in Figure 1-3, the present invention provides a kind of concrete crack repairing method, comprises the following steps:

S1, crack pretreatment;

S11. Use high-pressure air to clean the floating dust on the surface of the crack, so as to prevent the floating dust on the surface of the crack from falling into the inside of the crack during the subsequent construction process, which will affect the repair effect;

S12. Install a pouring device at the left end of the crack, fill the pouring device with water, and the water will automatically flow into the crack under the action of its own gravity; water is poured into the crack to wash the impurities inside the crack;

S13. As shown in Figure 1, a plurality of vacuuming points are arranged at intervals along the length of the crack, and any vacuuming point is provided with a vacuuming device. When water flows into the crack, it is vacuumed sequentially from left to right. Vacuum at the point with negative pressure, when the vacuum device pumps out the water, stop working, and carry out the vacuum at the next vacuum point, as shown in Figure 3, until the water fills the entire crack; pour water into the crack through the perfusion device, cooperate with The vacuum device on the surface of the crack is vacuumed sequentially, which can make the water fill the entire crack quickly and improve the construction efficiency;

S14. Continue to pour water and perform negative pressure vacuuming at the last vacuum point until the vacuum device pumps out water; after the water fills the cracks, perform negative pressure vacuuming at the last vacuum point to remove The impurity water is pumped out of the crack to prepare for the subsequent filling of epoxy resin glue;

S15. Use an air compressor to press high-pressure air into the crack at the pouring device, and the vacuum device continues to vacuumize under negative pressure until no water is drawn out from the crack; The other end of the crack is continuously vacuumed, and the cooperation between the two can accelerate the water in the crack to drain out of the crack and speed up the construction efficiency;

S16. Use a film with dustproof and water permeable effects to cover the cracks, and perform follow-up operations after it dries for 5-7 days;

S2, crack filling;

Replace the water inside the filling device with epoxy resin glue, and repeat steps S11-S13; the epoxy resin glue can be cured on a wet surface, and when there is a wet part in the crack, the epoxy resin glue can be cured on a wet surface function, it can also seal the cracks well and ensure the repair effect of the cracks, and in order to ensure the subsequent repair effect, the strength of the epoxy resin glue selected needs to be greater than the strength of the repaired concrete cracks;

S3, crack sealing;

When the surface of the crack is covered with glue, cover the crack with a plastic film, and the part where the plastic film contacts the concrete surface is filled with glue;

S4, maintenance;

Continue pouring epoxy resin glue and vacuuming for 1 minute. When there is no void in the contact part of the plastic film and the concrete surface, turn off the vacuuming device, and save more than half of the epoxy resin glue in the pouring device, and keep it open after 7 days of continuous maintenance on site . The invention pre-treats the cracks, solves the problem of not cleaning up the floating dust and dust in the cracks in the traditional crack repair process, ensures the pourability of the cracks from the source, ensures the repair effect, and provides a reasonable and effective solution for cracks in concrete engineering. Advanced repair technology, suitable for concrete repair in various scenarios, can greatly reduce structural risks.

In another technical solution, in the step S2, when pouring the epoxy resin glue into the crack, the contact surface tension T of the epoxy resin glue and the concrete contact angle θ should satisfy 0.05≤2Tcosθ.

In this technical solution, by setting the contact angle between the pouring material and the concrete, the epoxy resin can also penetrate into the inside of the crack under the action of its own gravity without pressure, which further ensures the crack perfusability.

In another technical solution, in step S3, when the surface of the crack is not covered with glue, use an injection device to coat the surface of the crack with glue, and then cover the crack with a plastic film from left to right, and observe while covering , when the covered plastic film and the concrete surface contact part appear void, lift the plastic film and continue to fill the glue and then cover again until the entire crack is covered and the plastic film and the concrete surface contact part is filled with glue.

In this technical solution, in order to ensure that the glue inside the crack is fully filled, when the inside of the crack is filled with glue, the surface also needs to be covered with glue, and when there is a cavity in the contact part of the plastic film and the concrete surface, it may be It is caused by insufficient perfusion, so it is necessary to refill the glue and cover the film again to ensure the repair effect of subsequent cracks.

In another technical solution, the thickness of the plastic film is not less than 0.05 mm.

In another technical solution, in the step S13, the vacuum negative pressure is 0-0.1 MPa; in the step S15, the high-pressure air pressure is not lower than 2 MPa.

In another technical solution, in the step S12, a pressure of 0-10 MPa is used to assist perfusion.

In this technical solution, through pressure-assisted continuous perfusion, it is possible to ensure that the epoxy resin glue is injected into the fine parts of the cracks, further improving the perfusion effect.

In another technical solution, in the step S12, the contact part between the bottom of the pouring device and the concrete surface is in a sealed state.

In this technical solution, the bottom of the pouring device is sealed with the concrete surface, which can ensure that the materials in the pouring device will not flow out from the contact surface, affecting subsequent operations.

In another technical solution, during the repairing process of the cracks, the cracks are reinforced by pasting carbon fiber sheet materials to ensure that the cracks will not crack again during the repairing process.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the use listed in the specification and implementation, it can be applied to various fields suitable for the present invention, and it can be easily understood by those skilled in the art Therefore, the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims (8)

1. A concrete crack repairing method is characterized by comprising the following steps:

s1, preprocessing a crack;

s11, cleaning floating dust on the surface of the crack by using high-pressure air;

s12, arranging a filling device at the left end of the crack, and filling water into the filling device, wherein the water automatically flows into the crack under the action of self gravity;

s13, arranging a plurality of vacuumizing points at intervals at the crack along the length direction of the crack, wherein a vacuumizing device is arranged on any vacuumizing point, the vacuumizing points are sequentially vacuumized in a negative pressure manner from left to right when water flows into the crack, and after the vacuumizing device extracts water, the operation is stopped, and vacuumizing at the next vacuumizing point is performed until the whole crack is filled with water;

s14, continuously filling water and performing negative pressure vacuumizing at the last vacuumizing point until the vacuumizing device extracts water;

s15, pressing high-pressure air into the crack at the position of the filling device by adopting an air compressor, and continuously vacuumizing the crack by adopting a vacuumizing device under negative pressure until no water is pumped out from the crack;

s16, covering the crack with a film, and performing subsequent operation after the crack is dried for 5-7 days;

s2, crack pouring;

replacing water in the filling device with epoxy resin glue, and repeating the steps S11-S13;

s3, sealing the crack;

when the surface of the crack is fully distributed with the glue solution, a plastic film is adopted to cover the crack, and the contact part of the plastic film and the concrete surface is fully filled with the glue solution;

s4, maintaining;

and continuously pouring the epoxy resin glue and vacuumizing for 1min, closing the vacuumizing device when no cavity is formed in the contact part of the plastic film and the concrete surface, keeping more than half of the epoxy resin glue in the pouring device, and keeping the spot open after continuously maintaining for 7d after the epoxy resin glue in the crack is cured.

2. The method for repairing concrete cracks according to claim 1, wherein in the step S2, when the epoxy resin adhesive is poured into the cracks, the contact surface tension T of the epoxy resin adhesive and the contact angle θ of the concrete should satisfy 0.05 ≤ 2Tcos θ.

3. The method for repairing concrete cracks according to claim 1, wherein in step S3, when the crack surface is not filled with the glue solution, the glue solution is applied to the crack surface by using an injection device, then the crack is covered with a plastic film from left to right, and the plastic film is observed while covering, when the covered portion of the plastic film in contact with the concrete surface is hollow, the plastic film is lifted and continuously filled with the glue solution, and then the plastic film is covered again until the whole crack is covered and the portion of the plastic film in contact with the concrete surface is filled with the glue solution.

4. A concrete crack repair method as claimed in claim 3, characterized in that the thickness of the plastic film is not less than 0.05mm.

5. The concrete crack repairing method according to claim 1, wherein in the step S13, the vacuuming negative pressure is 0-0.1MPa; in step S15, the pressure of the high-pressure air is not lower than 2MPa.

6. The method for repairing concrete cracks according to claim 1, wherein in step S12, the pressure of 0-10Mpa is used for auxiliary pouring.

7. The concrete crack repairing method according to claim 1, wherein in the step S12, a contact portion of the bottom of the pouring device and the concrete surface is in a sealed state.

8. The method for repairing concrete cracks as claimed in claim 1, wherein in the process of repairing the cracks, the cracks are reinforced by a method of reinforcing by adhering carbon fiber sheet materials, so that the cracks are prevented from secondary cracking in the process of repairing.

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