CN110821205A - Concrete crack negative pressure repair construction device and construction method - Google Patents

Abstract

The invention relates to a construction device and a construction method for repairing concrete cracks, belonging to the technical field of building construction. An injection port is arranged in the middle of a grouting base; The grouting device includes a grouting nozzle inserted into the injection port of the grouting base, and a grouting pump connected with the grouting nozzle through the grouting pipe. While squeezing grouting into the crack through the device, a negative pressure is generated in the crack through the action of the vacuum pump. It is easy to fill and fill the entire crack to achieve the effect of comprehensive repair of concrete cracks.

Description

Concrete crack negative pressure repair construction device and construction method

technical field

The invention belongs to the technical field of building construction, and particularly relates to a construction device and a construction method for repairing concrete cracks with negative pressure after cracks occur in concrete such as beams, slabs (walls, columns).

Background technique

With the continuous progress of society and the continuous development of cities, various road bridges in three-dimensional traffic have also emerged. After bridges have been used for a certain period, due to overloaded vehicles, the environment and other factors, many bridges (boards) have been damaged. Different degrees of fine cracks appear on the bottom surface. Although the cracks will not have a great impact on the safety of the bridge temporarily, as time goes on, under the influence of the environment and load during the service of the bridge, the tiny cracks can develop into Destructive through and deep fissures. Through cracks and deep cracks will corrode ordinary steel bars or prestressed steel bars, destroy the integrity of the structure, and change the stress conditions of concrete, which may damage the local or even the overall structure, seriously affecting the quality and operational safety of the bridge. .

For concrete cracks, the general repair methods include surface treatment method, grouting method, polymer immersion method, drilling impact method and so on. As for the concrete closed pools of bridges and chemical plants, the cracks are generally on the lower surface of the beams (slabs) due to the stress, the concrete material is affected by itself and the external environment and many other factors, plus the factors of gravity, according to the general repair method , the repair agent is difficult to fill, and it is difficult to fill the entire crack, and its repair quality is difficult to meet the design requirements.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a negative pressure repairing construction device and construction method for concrete cracks, through the construction device and method of the present invention, when repairing concrete cracks, while squeezing grouting into the cracks, through the vacuum pump Under the extrusion action of the grouting pump, the material used for repair can effectively overcome the gravity effect of the repair material, and it is easier to fill and fill the entire crack, so as to achieve a comprehensive repair of concrete cracks. effect.

The object of the present invention is achieved through the following technical solutions: a negative pressure repairing construction device for concrete cracks, characterized in that: it includes a grouting base, a negative pressure pumping device and a grouting device, and the grouting base is formed by the base body. It is composed of an injection port whose middle part of the base body is perpendicular to the base body and penetrates through the base body; the negative pressure pumping device includes a negative pressure pumping nozzle inserted into the injection port of the grouting base, one end is connected with the negative pressure pumping nozzle, and the other end is connected with the vacuum pump. The gas pipe; the grouting device includes a grouting nozzle inserted into the injection port of the grouting base, and a grouting pump connected with the grouting nozzle through the grouting pipe.

A sealing gasket is installed in the injection port.

The inner periphery of the grouting base is provided with a sealing groove.

A construction method of a negative pressure repairing construction device for concrete cracks is characterized in that: it comprises the following steps:

1) Determine the position of the base: set the negative pressure port or grouting port at a distance of 30-50cm;

2) Sealing concrete cracks: Seal the concrete cracks with sealing materials, and reserve the position of the base;

3) Install the base: at the selected position of the negative pressure suction port and the grouting port, fix the base along the crack;

4), injecting repair agent: under closed conditions, insert the suction nozzle and grouting nozzle into the injection ports of the two adjacent bases, turn on the vacuum pump, and pump the negative pressure nozzle and trachea to remove the cracks. The air is pumped out to generate negative pressure; then the special grouting pump is turned on. Under the combined action of the extrusion pump and the negative pressure in the crack, the pre-prepared repair agent is filled into the concrete crack, and the base of the negative pressure nozzle is to be pumped. After confirming that the cracks in this section are filled, the grouting can be stopped, and the suction nozzle and grouting nozzle are moved to the injection port of the next group of bases for circulating grouting.

Described concrete crack negative pressure repair construction method, it also comprises the following steps:

1) Clean the cracks: Before determining the position of the base in step 1) of claim 4, remove the dust and oil on the surface of the concrete cracks to ensure the dryness and smoothness of the crack base, and use an air pump to clean up the debris in the cracks.

Described concrete crack negative pressure repair construction method, it also comprises the following steps:

4) Compression test: After the installation of the base in step 3) of claim 4, after the sealing belt is hardened, carry out a compression test to check whether the sealing belt is sealed tightly. The compressed gas enters the crack through the injection port of the base, and the air pressure is controlled at 0.1～ 0.2MPa.

Described concrete crack negative pressure repair construction method, it also comprises the following steps:

7) Restoration of the base layer: After the repairing agent injected in step 4) of claim 4 is cured, remove the sealant and sealing strip/cloth. If necessary, use a sander to polish the surface sealant, and finally use a special base repair material. Surface restoration was carried out to make the color as consistent as possible with the original concrete structure surface.

The sealing of concrete cracks: first brush the concrete cracks with sealant, the width is about 5cm, and then use the sealing strips/cloths to stick them tightly and firmly to form a sealing belt, and reserve the position of the base.

A construction method of a negative pressure repairing construction device for concrete cracks is characterized in that: it comprises the following steps:

1) Clean the cracks: first remove the dust and oil on the surface of the concrete cracks to ensure the dryness and smoothness of the crack base, and use an air pump to clean up the debris in the cracks;

2) Determine the position of the base: set the negative pressure port or grouting port at a distance of 30-50cm;

3) Sealing concrete cracks: sealing the concrete cracks with sealing material, and reserving the position of the base;

4) Install the base: at the selected position of the negative pressure suction port and the grouting port, fix the base along the crack;

5) Compression test: After the sealing belt is hardened, carry out a compression test to check whether the sealing belt is sealed tightly. The compressed gas enters the crack through the base injection port, and the air pressure is controlled at 0.1-0.2MPa;

6), injecting repair agent: under closed conditions, insert the suction nozzle and grouting nozzle into the injection ports of the two adjacent bases, turn on the vacuum pump, and pump the negative pressure nozzle and trachea to remove the cracks. The air is pumped out to generate negative pressure; then the special grouting pump is turned on. Under the combined action of the extrusion pump and the negative pressure in the crack, the pre-prepared repair agent is filled into the concrete crack, and the base of the negative pressure nozzle is to be pumped. After confirming that the cracks in this section are filled, the grouting can be stopped, and the suction nozzle and grouting nozzle can be moved to the injection port of the next group of bases for circulating grouting;

7) Restoration of the base layer: After the injected repair agent is cured, remove the sealant and sealing strip/cloth. If necessary, use a sander to polish the surface sealant. Finally, use a special base repair material to restore the surface to make it color. It should be as consistent as possible with the original concrete structure surface.

The sealing of concrete cracks: first brush the concrete cracks with sealant, the width is about 5cm, and then use the sealing strips/cloths to stick them tightly and firmly to form a sealing belt, and reserve the position of the base.

The advantages and beneficial effects of the present invention are:

The invention uses the concrete crack repairing construction device to extract the air in the crack through the negative pressure device to form a negative pressure environment, and under the squeezing action of the grouting pump, it can well solve the problem that the depth of the crack is not easy to fill and fill real problem.

Description of drawings

Figure 1 is the construction process flow chart a: clean up the cracks and determine the location of the injection port;

Figure 2 is the construction process flow chart b: seal cracks with sealant, sealing strip/cloth;

Fig. 3 is the construction process flow chart c: install the base;

Fig. 4 is the construction process flow chart d: install the suction nozzle and the grouting nozzle on the base;

Fig. 5 is construction process flow chart e: start vacuum pump, pump negative pressure;

Figure 6 is the construction process flow chart f: start the grouting pump and start grouting;

Fig. 7 is construction process flow chart g: basic level restoration;

Figure 8 is a schematic cross-sectional view of the base;

Figure 9 is a top view of the base;

10 is a schematic diagram of a negative pressure pumping device;

Figure 11 is a schematic diagram of a grouting device.

in:

1-beam (plate), 2-crack, 3-reserved injection port, 4-sealant, 5-seal, 6-base, 7-grouting nozzle, 8-pumping negative pressure top nozzle, 9-repairing agent, 10- repaired crack, 11- injection port, 12- sealing groove, 13- sealing gasket, 14- air pipe, 15- vacuum pump, 16- slurry pipe, 17- grouting pump, 18- seat body.

Detailed ways

The construction device and construction method are described in detail below with reference to the accompanying drawings.

Embodiment 1: A negative pressure repairing construction device for concrete cracks, which includes a grouting base 6, a negative pressure pumping device and a grouting device, and the grouting base 6 includes a circular base 18. The circular base The middle part of 18 is integrally formed with a tubular injection port 11 perpendicular to the seat body. The tubular injection port 11 is connected to the seat body 18. A sealing gasket 13 with a diameter slightly smaller than the inner diameter of the injection port is installed in the injection port 11. The edge of the seat body of the grouting base 6 There is a ring of sealing grooves 12 at intervals on the inner circumference; the negative pressure pumping device includes a negative pressure pumping nozzle 8, one end of the negative pressure pumping nozzle 8 is inserted into the injection port 11 of the grouting base 6, and the negative pressure pumping nozzle 8 is injected with the base. The inner diameter of the inlet 11 is matched, and the suction nozzle 8 is inserted into the sealing gasket 13 in the injection port 6, and air can be pumped. After pulling out, the sealing gasket 13 is immediately sealed, and the other end of the suction nozzle 8 is connected to the vacuum pump through the air pipe 14. 15 is connected, and the air in the closed crack is pumped out by a vacuum pump to generate negative pressure; the grouting device includes a grouting nozzle 7, and one end of the grouting nozzle 7 is inserted into the injection port 11 of the grouting base 6, and the grouting nozzle 7 Matching the inner diameter of the base injection port 11, the other end is connected to the grouting pump 17 through the grout pipe 16. Under the extrusion of the grouting pump and the negative pressure in the crack, the repair fluid is filled into the concrete crack.

Example 2: As shown in Figures 1-7, the construction method of negative pressure repairing concrete cracks using the construction device of Example 1, taking the repair work of a bridge crack in a municipal project as an example, the bridge is cast-in-place concrete , the thickness of beam (slab) 1 is 400mm, the lower pier is a column pier, and the foundation except the 0# abutment is the expansion foundation, and the rest are all bored piles; due to various factors such as the service life and the concrete itself, the bridge A large number of fine cracks 2 are produced below. In order to prevent the further deterioration of the cracks and affect the safety of the bridge, the cracks need to be repaired.

The crack is now repaired by the method of negative pressure repair. In the process of repairing the crack, follow the following steps:

1) Preparatory work: prepare the equipment, materials, etc. required for repair;

2), clean up cracks: remove the dust and oil on the surface of concrete cracks 2, clean with cleaning agent if necessary, ensure the dryness and smoothness of the crack base, and use an air pump to clean up the debris in the cracks;

3) Determine the position of the base: Set the reserved injection port 3 at a distance of 30-50cm. The negative pressure device installed at the reserved injection port 3 is the negative pressure port, and the installation of the grouting device is the grouting port. The position of the injection port 3 should be set as far as possible in the part where the crack is wider, the opening is more unobstructed or forked; as shown in Figure 1;

4) Sealing concrete cracks: first brush the concrete cracks with sealant, with a width of about 5cm, and then use the sealing strips/cloths to stick them tightly and firmly to form a sealing belt, which can seal the cracks. / The cloth has high strength, which can play a role in reinforcement, and reserve the position of the base; as shown in Figure 2;

5) Install the base: at the selected position of the reserved injection port 3, fix the base 6 with the sealant 4 one by one along the crack, and check that the base 6 is firmly adhered and sealed, and at the same time, ensure that the injection port 11 is properly sealed. smooth; as shown in Figure 3;

6) Air pressure test: After the sealing belt is hardened, the compressed gas is passed into the base injection port for air pressure test to check whether the sealing belt is tight and the air pressure is controlled at 0.1-0.2MPa. If it is found that there is foam on the sealing belt after ventilation, it means that the part is leaking, and the leaking part is closed again;

7), injecting repair agent: under closed conditions, install the suction nozzle and grouting nozzle on the injection ports of the two adjacent bases, turn on the vacuum pump, and pump the negative pressure nozzle and trachea. The air is extracted to generate negative pressure;

Then turn on the special grouting pump, under the combined action of the squeeze of the grouting pump and the negative pressure in the crack, fill the pre-prepared repair agent 9 into the concrete crack, and return the slurry to the injection port of the base of the negative pressure nozzle to be pumped. After confirming that the cracks in this section are filled, stop grouting, and move the suction nozzle and grouting nozzle to the next group of bases for circulating grouting;

Since the sealing gasket 13 with a diameter slightly smaller than the inner diameter of the injection port 11 is installed in the injection port 11 of the base, a vacuum or grouting can be performed by piercing the rubber gasket with a negative pressure pumping nozzle or a grouting nozzle. Closed, the base injection port has the function of closing and sealing;

8), restoration of the base layer: after the injected repair agent is cured, remove the sealant and sealing strip/cloth according to the needs of the project. material, carry out surface restoration to make its color as consistent as possible with the original concrete structure surface, and repair the cracks, as shown in Figure 7. Repaired cracks 10;

9) After the grouting work is completed, use compressed air to blow out the residual liquid in the suction negative pressure device and the grouting device, and use acetone to flush the pipeline and tools for the next use.

Embodiment 3: As shown in Figure 1-7, the construction method of concrete crack repairing with negative pressure using the construction device of Example 1 is taken as an example of the repairing work of a closed pool roof crack in a certain chemical project. When pouring concrete, the pool is 20 meters long, 8 meters wide, and 3.5 meters high, of which the thickness of the beam (slab) 1 is 200 mm; due to the influence of various factors such as the service life and the concrete itself, a large number of fine cracks 2 are generated under the top plate 1, Due to the existence of corrosive substances in chemical enterprises, in order to prevent the cracks from further expanding, the corrosive substances erode the steel bars of the plate and affect the structural safety of the pool, so the cracks need to be repaired.

The crack is now repaired by the method of negative pressure repair. In the process of repairing the crack, follow the following steps:

1) Preparatory work: prepare the equipment, materials, etc. required for repair;

2), clean up cracks: remove the dust and oil on the surface of concrete cracks 2, clean with cleaning agent if necessary, ensure the dryness and smoothness of the crack base, and use an air pump to clean up the debris in the cracks;

3) Determine the position of the base: Set the reserved injection port 3 at a distance of 30-50cm. The negative pressure device installed at the reserved injection port 3 is the negative pressure port, and the installation of the grouting device is the grouting port. The position of the injection port 3 should be set as far as possible in the part where the crack is wider, the opening is more unobstructed or forked; as shown in Figure 1;

4) Sealing concrete cracks: first brush the concrete cracks with sealant, with a width of about 5cm, and then use the sealing strips/cloths to stick them tightly and firmly to form a sealing belt, which can seal the cracks. / The cloth has high strength, which can play a role in reinforcement, and reserve the position of the base; as shown in Figure 2;

5) Install the base: at the selected position of the reserved injection port 3, fix the base 6 with the sealant 4 one by one along the crack, and check that the base 6 is firmly adhered and sealed, and at the same time, ensure that the injection port 11 is properly sealed. smooth; as shown in Figure 3;

6) Air pressure test: After the sealing belt is hardened, the compressed gas is passed into the base injection port for air pressure test to check whether the sealing belt is tight and the air pressure is controlled at 0.1-0.2MPa. If it is found that there is foam on the sealing belt after ventilation, it means that the part is leaking, and the leaking part is closed again;

7), injecting repair agent: under closed conditions, install the suction nozzle and grouting nozzle on the injection ports of the two adjacent bases, turn on the vacuum pump, and pump the negative pressure nozzle and trachea. The air is extracted to generate negative pressure;

Then turn on the special grouting pump, under the combined action of the squeeze of the grouting pump and the negative pressure in the crack, fill the pre-prepared repair agent 9 into the concrete crack, and return the slurry to the injection port of the base of the negative pressure nozzle to be pumped. After confirming that the cracks in this section are filled, stop grouting, and move the suction nozzle and grouting nozzle to the next group of bases for circulating grouting;

Since the sealing gasket 13 with a diameter slightly smaller than the inner diameter of the injection port 11 is installed in the injection port 11 of the base, a vacuum or grouting can be performed by piercing the rubber gasket with a negative pressure pumping nozzle or a grouting nozzle. Closed, the base injection port has the function of closing and sealing;

8), restoration of the base layer: after the injected repair agent is cured, remove the sealant and sealing strip/cloth according to the needs of the project. material, carry out surface restoration to make its color as consistent as possible with the original concrete structure surface, and repair the cracks, as shown in Figure 7. Repaired cracks 10;

9) After the grouting work is completed, use compressed air to blow out the residual liquid in the suction negative pressure device and the grouting device, and use acetone to flush the pipeline and tools for the next use.

Claims (10)

1. The utility model provides a concrete crack's negative pressure repair construction equipment which characterized in that: the grouting base is composed of a base body and an injection port, wherein the middle part of the base body is vertical to the base body and penetrates through the base body; the negative pressure pumping device comprises a negative pressure pumping top nozzle inserted into the injection port of the grouting base and an air pipe, one end of the air pipe is connected with the negative pressure pumping top nozzle, and the other end of the air pipe is connected with the vacuum pump; the grouting device comprises a grouting nozzle inserted into the filling opening of the grouting base and a grouting pump connected with the grouting nozzle through a grouting pipe.

2. The negative pressure repairing construction device for concrete cracks according to claim 1, characterized in that: and a sealing rubber gasket is arranged in the injection port.

3. The negative pressure repairing construction device for concrete cracks according to claim 1, characterized in that: and a sealing groove is formed in the inner periphery of the grouting base.

4. A construction method using the negative pressure repairing construction device for concrete cracks according to any one of claims 1 to 3, characterized in that: it comprises the following steps:

1) determining the position of the base: arranging a negative pressure pumping port or a grouting port at a distance of 30-50 cm;

2) sealing concrete cracks: sealing the concrete cracks with a high-strength sealing material, and reserving the position of a base;

3) and a base is installed: fixing the base along the crack at the selected positions of the negative pressure pumping port and the grouting port;

4) and injecting a repairing agent: under the closed condition, respectively inserting the negative pressure pumping top nozzle and the grouting nozzle into the injection ports of two adjacent bases, starting a vacuum pump, and pumping air in the crack out through the negative pressure pumping top nozzle and the air pipe to generate negative pressure; and starting the special grouting pump, filling the prepared repairing agent into the concrete cracks under the combined action of extrusion of the grouting pump and negative pressure in the cracks, stopping grouting after the filling opening of the base of the negative pressure top nozzle is pumped and the cracks are confirmed to be filled, and moving the negative pressure top nozzle and the grouting nozzle to the filling opening of the next group of bases for circular grouting.

5. The concrete crack negative pressure repairing construction method according to claim 4, characterized in that: it also includes the following steps:

1) and cleaning cracks: before the position of the base is determined according to the step 1) of claim 4, firstly removing dust and oil stains on the surface of the concrete crack to ensure the dryness and smoothness of the crack base layer, and cleaning impurities in the crack by using an air pump.

6. The concrete crack negative pressure repairing construction method according to claim 4, characterized in that: it also includes the following steps:

4) and air compression test: after the base is installed in the step 3) of claim 4, after the sealing strip is hardened, a pneumatic test is carried out to check whether the sealing strip is sealed, compressed air enters the crack through the injection opening of the base, and the air pressure is controlled to be 0.1-0.2 MPa.

7. The concrete crack negative pressure repairing construction method according to claim 4, characterized in that: it also includes the following steps:

7) and recovering the base layer: after the repairing agent injected in the step 4) of the claim 4 is cured, the sealant and the sealing strip/cloth are removed, the surface sealant can be polished by a polisher if necessary, and finally, a special base layer repairing material is used for surface restoration, so that the color of the repairing agent is consistent with the surface of the original concrete structure as much as possible.

8. The concrete crack negative pressure repairing construction method according to claim 4, characterized in that: sealing the concrete cracks: brushing the concrete crack once by using the sealant, wherein the width of the concrete crack is about 5cm, tightly and firmly pasting the concrete crack by using the sealing strip/cloth to form a sealing strip, and reserving the position of the base.

9. A construction method using the negative pressure repairing construction device for concrete cracks according to any one of claims 1 to 3, characterized in that: it comprises the following steps:

1) and cleaning cracks: firstly, removing dust and oil stains on the surface of a concrete crack, ensuring the dryness and smoothness of a crack base layer, and cleaning impurities in the crack by using an air pump;

2) determining the position of the base: arranging a negative pressure pumping port or a grouting port at a distance of 30-50 cm;

3) sealing concrete cracks: sealing the concrete cracks with a sealing material, and reserving the position of a base;

4) and a base is installed: fixing the base along the crack at the selected positions of the negative pressure pumping port and the grouting port;

5) and air compression test: after the sealing tape is hardened, carrying out a gas compression test, checking whether the sealing tape is sealed, and controlling the gas pressure to be 0.1-0.2 MPa when compressed gas enters a crack through a base injection opening;

6) and injecting a repairing agent: under the closed condition, respectively inserting the negative pressure pumping top nozzle and the grouting nozzle into the injection ports of two adjacent bases, starting a vacuum pump, and pumping air in the crack out through the negative pressure pumping top nozzle and the air pipe to generate negative pressure; starting a special grouting pump, filling the prepared repairing agent into the concrete cracks under the combined action of extrusion of the grouting pump and negative pressure in the cracks, stopping grouting after the filling opening of the negative pressure top nozzle base is pumped to return slurry, and moving the negative pressure top nozzle and the grouting nozzle to the filling opening of the next group of bases to perform circulating grouting after the cracks are confirmed to be filled;

7) and recovering the base layer: after the injected repairing agent is cured, the sealant and the sealing strips/cloth are removed, the surface sealant can be polished by a polisher if necessary, and finally, a special base layer repairing material is used for surface restoration, so that the color of the repairing agent is consistent with that of the surface of the original concrete structure as much as possible.

10. The concrete crack negative pressure repairing construction method according to claim 9, characterized in that: sealing the concrete cracks: brushing the concrete crack once by using the sealant, wherein the width of the concrete crack is about 5cm, tightly and firmly pasting the concrete crack by using the sealing strip/cloth to form a sealing strip, and reserving the position of the base.

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