CN110821205A - Concrete crack negative pressure repairing construction device and construction method - Google Patents
Concrete crack negative pressure repairing construction device and construction method Download PDFInfo
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- CN110821205A CN110821205A CN201911163406.0A CN201911163406A CN110821205A CN 110821205 A CN110821205 A CN 110821205A CN 201911163406 A CN201911163406 A CN 201911163406A CN 110821205 A CN110821205 A CN 110821205A
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- E—FIXED CONSTRUCTIONS
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- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
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Abstract
The invention relates to a construction device and a construction method for repairing a concrete crack, belonging to the technical field of building construction.A filling opening is arranged in the middle of a grouting base; 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. When extrudeing the slip casting through the device in toward the crack, through the effect of vacuum pump, produce the negative pressure in the crack, this negative pressure makes the used material of repair under the squeezing action of grouting pump, can effectively overcome the action of gravity, and the whole crack is filled, tamped more easily, reaches the effect of repairing the concrete crack comprehensively.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a negative pressure repairing construction device and a construction method for concrete cracks after the concrete such as beams, plates (walls, columns) and the like cracks.
Background
With the continuous progress of society and the continuous development of cities, road bridges in various three-dimensional traffic come into play, after the bridges are used for a certain period, due to the action of factors such as overloaded vehicles and environments, the bottom surfaces of a plurality of bridges (plates) have micro cracks with different degrees, although the cracks have no great influence on the safety of the bridges temporarily, the micro cracks can be developed into destructive through cracks and deep cracks under the influence of the environment and load in the service process of the bridges along with the passage of time. The through cracks and deep cracks can corrode common steel bars or prestressed steel bars, the integrity of the structure is damaged, and the stress condition of concrete is changed, so that the possibility of damaging local and even whole structures is caused, and the quality and the operation safety of the bridge are seriously influenced.
For concrete cracks, general repairing methods are surface treatment, grouting, polymer dipping, drilling and plugging, and the like. For the concrete closed pool of the bridge and the chemical plant, the stress and the concrete material are subjected to various factors such as self and external environment, the crack is generally positioned on the lower surface of the beam (plate), and the factor of gravity is added, so that according to a general repairing method, the repairing agent is difficult to fill, the whole crack is difficult to fill, and the repairing quality is difficult to meet the design requirement.
Disclosure of Invention
The invention aims to provide a negative pressure repairing construction device and a construction method for concrete cracks.
The purpose of the invention is realized by the following technical scheme: 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.
And a sealing rubber gasket is arranged in the injection port.
And a sealing groove is formed in the inner periphery of the grouting base.
A construction method of a negative pressure repairing construction device for concrete cracks is 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 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.
The concrete crack negative pressure repairing construction method further comprises 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.
The concrete crack negative pressure repairing construction method further comprises 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.
The concrete crack negative pressure repairing construction method further comprises 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.
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.
A construction method of a negative pressure repairing construction device for concrete cracks is 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.
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.
The invention has the advantages and beneficial effects that:
the invention utilizes the concrete crack repairing construction device to pump out air in the crack through the negative pressure device to form a negative pressure environment, and can well solve the problem that the deep part of the crack is not easy to fill and tamp under the extrusion action of the grouting pump.
Drawings
FIG. 1 is a construction process flow chart a: cleaning cracks and determining the position of an injection port;
FIG. 2 is a construction process flow diagram b: sealing the crack with sealant and sealing strip/cloth;
FIG. 3 is a flow chart of the construction process c: installing a base;
FIG. 4 is a flow chart d of the construction process: installing a negative pressure pumping top nozzle and a grouting nozzle on a base;
FIG. 5 is a flow chart e of a construction process in which a vacuum pump is started to pump negative pressure;
FIG. 6 is a flow chart f of the construction process, wherein a grouting pump is started to start grouting;
FIG. 7 is a construction process flow diagram g of base course restoration;
FIG. 8 is a schematic cross-sectional view of a base;
FIG. 9 is a top view of the base;
FIG. 10 is a schematic view of a negative pressure pumping device;
fig. 11 is a schematic view of a grouting device.
Wherein:
1-beam (plate), 2-crack, 3-reserved injection port, 4-sealant, 5-sealing strip, 6-base, 7-grouting nozzle, 8-negative pressure pumping top nozzle, 9-repairing agent, 10-repaired crack, 11-injection port, 12-sealing groove, 13-sealing rubber pad, 14-air pipe, 15-vacuum pump, 16-grout pipe, 17-grout pump and 18-seat body.
Detailed Description
The construction apparatus and the construction method will be described in detail with reference to the accompanying drawings.
Example 1: a negative pressure repairing construction device for concrete cracks comprises a grouting base 6, a negative pressure pumping device and a grouting device, wherein the grouting base 6 comprises a circular base 18, a tubular filling opening 11 which is vertical to the base is integrally formed in the middle of the circular base 18, the tubular filling opening 11 is communicated with the base 18, a sealing rubber gasket 13 with the diameter slightly smaller than the inner diameter of the filling opening is arranged in the filling opening 11, and a circle of sealing grooves 12 are formed in the inner periphery of the edge of the base of the grouting base 6 at intervals; the negative pressure pumping device comprises a negative pressure pumping top nozzle 8, one end of the negative pressure pumping top nozzle 8 is inserted into an injection port 11 of a grouting base 6, the negative pressure pumping top nozzle 8 is matched with the inner diameter of the injection port 11 of the base, the negative pressure pumping top nozzle 8 is inserted into a sealing rubber mat 13 in the injection port 6 and can pump air, the sealing rubber mat 13 is immediately sealed after being pulled out, the other end of the negative pressure pumping top nozzle 8 is connected with a vacuum pump 15 through an air pipe 14, and air in a sealed crack is pumped out through the vacuum pump to generate negative pressure; the grouting device comprises a grouting nozzle 7, one end of the grouting nozzle 7 is inserted into an injection port 11 of a grouting base 6, the grouting nozzle 7 is matched with the inner diameter of the injection port 11 of the base, the other end of the grouting nozzle is connected with a grouting pump 17 through a grout pipe 16, and under the extrusion of the grouting pump and the negative pressure in a crack, the repairing liquid is filled into the concrete crack.
Example 2: as shown in fig. 1 to 7, the construction method of the concrete crack negative pressure repair using the construction apparatus of example 1 is exemplified by a repair work of a bridge crack in a certain municipal works, the bridge is cast-in-place concrete, the thickness of a beam (slab) 1 is 400mm, a lower pier is a columnar pier, a foundation except a 0# abutment is an enlarged foundation, and the rest is a bored pile; due to the influence of various factors such as the service life and the concrete, a large number of fine cracks 2 are generated under the bridge, and the cracks need to be repaired in order to prevent the cracks from further deteriorating to influence the safety of the bridge.
The crack is repaired by adopting a negative pressure repairing method, and the following steps are followed in the crack repairing construction process:
1) and preparation work: preparing machines, materials and the like required by repairing;
2) and cleaning cracks: removing dust and oil stains on the surface of the concrete crack 2, cleaning the concrete crack by using a cleaning agent if necessary to ensure the drying and smoothness of a crack base layer, and cleaning impurities in the crack by using an air pump;
3) determining the position of the base: a reserved injection hole 3 is arranged at a distance of 30-50 cm, a negative pressure pumping device is arranged at the reserved injection hole 3 and is a negative pressure pumping port, a grouting device is arranged and is a grouting port, and the position of the reserved injection hole 3 is arranged at a position with a wider crack, a smoother opening or a split position as much as possible; as shown in fig. 1;
4) sealing concrete cracks: brushing the concrete crack once by using the sealant, wherein the width of the concrete crack is about 5cm, and then completely tightly and firmly sticking the concrete crack by using the sealing strip/cloth to form a sealing strip, so that the effect of sealing the crack is achieved, and meanwhile, the sealing strip/cloth has higher strength, so that the reinforcing effect can be achieved, and the position of the base is reserved; as shown in fig. 2;
5) and a base is installed: fixing the bases 6 one by using the sealant 4 along the cracks at the selected positions where the injection ports 3 are reserved, and ensuring the smoothness of the injection ports 11 while checking the firm adhesion and the sealing of the bases 6; as shown in fig. 3;
6) and air compression test: after the sealing tape is hardened, compressed air is introduced into an injection hole of the base to carry out an air compression test, whether the sealing tape is tight or not is checked, the air pressure is controlled to be 0.1-0.2 MPa, at the moment, soapy water is coated on the sealing tape and the periphery of the base, if foam appears on the sealing tape after air ventilation, the air leakage of the part is indicated, and the air leakage part is sealed again;
7) and injecting a repairing agent: under the closed condition, respectively installing a negative pressure pumping top nozzle and a grouting nozzle on 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 an air pipe to generate negative pressure;
starting a special grouting pump, filling a prepared repairing agent 9 into a concrete crack under the combined action of extrusion of the grouting pump and negative pressure in the crack, stopping grouting after a filling opening of a base of the negative pressure top nozzle is pumped and the crack is confirmed to be filled, and moving the negative pressure top nozzle and a grouting nozzle to the next group of bases for circulating grouting;
because the sealing rubber mat 13 with the diameter slightly smaller than the inner diameter of the filling opening 11 is arranged in the filling opening 11 of the base, the rubber mat can be vacuumized or grouted by puncturing a negative pressure drawing top nozzle or a grouting nozzle, the rubber mat is closed after being drawn out, and the filling opening of the base has the functions of closing and sealing;
8) and recovering the base layer: after the injected repairing agent is cured, removing the sealant and the sealing strips/cloth according to engineering requirements, or not removing the sealant, polishing the surface sealant by using a polisher if necessary, and finally using a special base layer repairing material for surface restoration to ensure that the color of the repairing agent is consistent with that of the surface of the original concrete structure as much as possible and the crack is repaired, wherein the repaired crack 10 is shown in fig. 7;
9) after the grouting operation is finished, residual liquid in the negative pressure pumping device and the grouting device is blown clean by compressed air, and the pipeline and tools are flushed by acetone for the next use.
Example 3: as shown in fig. 1 to 7, the construction method of the concrete crack negative pressure repair using the construction apparatus of example 1, taking a repair of a crack in a top plate of a closed pool of a chemical engineering project as an example, the closed pool is cast-in-place concrete, the length of the pool is 20 meters, the width thereof is 8 meters, and the height thereof is 3.5 meters, wherein the thickness of the beam (plate) 1 is 200 mm; because of the multiple factor influences such as service life and concrete self, produced a large amount of slight cracks 2 below its roof 1, because there is corrosive substance in the chemical industry enterprise, for preventing that the crack further enlarges, corrosive substance corrodes the reinforcing bar of board, influences the structural safety in pond, needs repair this crack.
The crack is repaired by adopting a negative pressure repairing method, and the following steps are followed in the crack repairing construction process:
1) and preparation work: preparing machines, materials and the like required by repairing;
2) and cleaning cracks: removing dust and oil stains on the surface of the concrete crack 2, cleaning the concrete crack by using a cleaning agent if necessary to ensure the drying and smoothness of a crack base layer, and cleaning impurities in the crack by using an air pump;
3) determining the position of the base: a reserved injection hole 3 is arranged at a distance of 30-50 cm, a negative pressure pumping device is arranged at the reserved injection hole 3 and is a negative pressure pumping port, a grouting device is arranged and is a grouting port, and the position of the reserved injection hole 3 is arranged at a position with a wider crack, a smoother opening or a split position as much as possible; as shown in fig. 1;
4) sealing concrete cracks: brushing the concrete crack once by using the sealant, wherein the width of the concrete crack is about 5cm, and then completely tightly and firmly sticking the concrete crack by using the sealing strip/cloth to form a sealing strip, so that the effect of sealing the crack is achieved, and meanwhile, the sealing strip/cloth has higher strength, so that the reinforcing effect can be achieved, and the position of the base is reserved; as shown in fig. 2;
5) and a base is installed: fixing the bases 6 one by using the sealant 4 along the cracks at the selected positions where the injection ports 3 are reserved, and ensuring the smoothness of the injection ports 11 while checking the firm adhesion and the sealing of the bases 6; as shown in fig. 3;
6) and air compression test: after the sealing tape is hardened, compressed air is introduced into an injection hole of the base to carry out an air compression test, whether the sealing tape is tight or not is checked, the air pressure is controlled to be 0.1-0.2 MPa, at the moment, soapy water is coated on the sealing tape and the periphery of the base, if foam appears on the sealing tape after air ventilation, the air leakage of the part is indicated, and the air leakage part is sealed again;
7) and injecting a repairing agent: under the closed condition, respectively installing a negative pressure pumping top nozzle and a grouting nozzle on 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 an air pipe to generate negative pressure;
starting a special grouting pump, filling a prepared repairing agent 9 into a concrete crack under the combined action of extrusion of the grouting pump and negative pressure in the crack, stopping grouting after a filling opening of a base of the negative pressure top nozzle is pumped and the crack is confirmed to be filled, and moving the negative pressure top nozzle and a grouting nozzle to the next group of bases for circulating grouting;
because the sealing rubber mat 13 with the diameter slightly smaller than the inner diameter of the filling opening 11 is arranged in the filling opening 11 of the base, the rubber mat can be vacuumized or grouted by puncturing a negative pressure drawing top nozzle or a grouting nozzle, the rubber mat is closed after being drawn out, and the filling opening of the base has the functions of closing and sealing;
8) and recovering the base layer: after the injected repairing agent is cured, removing the sealant and the sealing strips/cloth according to engineering requirements, or not removing the sealant, polishing the surface sealant by using a polisher if necessary, and finally using a special base layer repairing material for surface restoration to ensure that the color of the repairing agent is consistent with that of the surface of the original concrete structure as much as possible and the crack is repaired, wherein the repaired crack 10 is shown in fig. 7;
9) after the grouting operation is finished, residual liquid in the negative pressure pumping device and the grouting device is blown clean by compressed air, and the pipeline and tools are flushed by acetone 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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| CN114396075B (en) * | 2021-12-31 | 2023-08-22 | 中交二公局第六工程有限公司 | Grouting material for repairing pipe gallery through crack and pipe gallery through crack repairing method |
| CN114397432A (en) * | 2022-03-24 | 2022-04-26 | 四川省水利水电勘测设计研究院有限公司 | Concrete structure surface crack detection device |
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