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CN-121976690-A - System and method for repairing concrete crack by epoxy resin grouting based on dialysis principle

CN121976690ACN 121976690 ACN121976690 ACN 121976690ACN-121976690-A

Abstract

The invention discloses a system and a method for repairing concrete cracks by grouting with epoxy resin based on a dialysis principle, which belong to the technical field of repairing concrete cracks and comprise a grouting system, a slurry pumping system and a filtering system; the grouting system comprises a grouting pump, a grouting material storage tank and a grouting pipe, the grouting system comprises a grouting pump, an impurity collection tank and a grouting pipe, the inlet end and the outlet end of the filtering system are respectively connected with the impurity collection tank and the grouting material storage tank, the filtering system comprises a rough filtering unit, a fine filtering unit and an adsorption unit which are sequentially connected in series from the inlet end to the outlet end, and the grouting system, the concrete crack, the grouting system and the filtering system are connected through pipelines to form a circulating flow path. According to the invention, through the cyclic dialysis process of filling, extracting, filtering and re-filling, impurities in the cracks are synchronously carried out and filtered, so that the integration of impurity removal and grouting reinforcement is realized, the bonding strength of a grouting material and a concrete crack wall is greatly improved, the repair quality is ensured, and the service life of a concrete structure is prolonged.

Inventors

  • Xiang Fuzhuang
  • YAN TAO
  • CHENG KAIGE
  • YANG WANSHAN
  • XU WENYING
  • LI XIAOHUA
  • DING JIANTONG
  • LI XUEFENG
  • PENG YONGBING
  • LI XUEFENG
  • GONG YING
  • HE MENGLIN
  • LIU LIPING
  • CHENG HUAWEI

Assignees

  • 中国水利水电第七工程局有限公司

Dates

Publication Date
20260505
Application Date
20260408

Claims (9)

  1. 1. The concrete crack epoxy resin grouting repair system based on the dialysis principle is characterized by comprising a grouting system, a slurry pumping system and a filtering system (3); The grouting system comprises a grouting pump (11), a grouting material storage tank (12) and a grouting pipe (13); The pulp pumping system comprises a pulp pumping pump (21), an impurity collecting tank (22) and a pulp pumping pipe (23); The inlet end and the outlet end of the filtering system (3) are respectively connected with the impurity collecting tank (22) and the grouting material storage tank (12), and the filtering system (3) comprises a rough filtering unit (31), a fine filtering unit (32) and an adsorption unit (33) which are sequentially connected in series from the inlet end to the outlet end; The concrete crack (5) is provided with a grouting opening, a slurry pumping opening and a sealing assembly (4), the sealing assembly (4) is covered outside the concrete crack (5), a grouting pipe (13) and a slurry pumping pipe (23) penetrate through the sealing assembly (4) to be connected with the grouting opening and the slurry pumping opening respectively, and a grouting system, the concrete crack (5), the slurry pumping system and a filtering system (3) form a circulating flow path through pipeline connection.
  2. 2. The concrete crack epoxy resin grouting repair system based on the dialysis principle as claimed in claim 1, wherein the rough filtering unit (31) adopts a metal filter screen with the filtering precision of 50-100 μm, the fine filtering unit (32) adopts a high molecular filter membrane with the filtering precision of 0.1-10 μm, and the adsorption unit (33) comprises a filling molecular sieve, a water absorption resin and an ion exchange resin.
  3. 3. The dialysis principle-based concrete crack epoxy resin grouting repair system as claimed in claim 1, wherein the sealing assembly (4) comprises a grouting port sealing sleeve (41), a grouting port sealing sleeve (42) and a crack surface sealing layer (43), the grouting port sealing sleeve (41) and the grouting port sealing sleeve (42) are made of elastic rubber and are attached to a crack wall, the grouting port sealing sleeve (41) and the grouting port sealing sleeve (42) are respectively connected with a grouting pipe (13) and a grouting pipe (23), and the crack surface sealing layer (43) is made of epoxy sealant.
  4. 4. The system for repairing the concrete cracks by grouting with epoxy resin based on the dialysis principle according to claim 1, wherein two groups of metering pumps (14) are arranged at the feeding end of the grouting material storage tank (12), a stirring assembly is arranged in the grouting material storage tank (12), and a refrigerating and temperature controlling assembly is arranged outside the grouting material storage tank (12).
  5. 5. The dialysis principle-based concrete crack epoxy resin grouting repair system as claimed in claim 1, wherein a slurry buffer plate (25) is arranged in the impurity collection tank (22), and the filtering system (3) is provided with a back flushing assembly.
  6. 6. The system for repairing the concrete cracks by grouting with epoxy resin based on the dialysis principle according to claim 1, wherein the grouting pipe (13) is provided with a pressure sensor and a flow control valve (16), and the grouting pipe (23) is provided with a flow monitoring valve (24).
  7. 7. The method for repairing the concrete cracks by grouting with epoxy resin based on the dialysis principle is characterized by comprising the following steps of: s1, crack pretreatment, which comprises the steps of S11-S12; s11, cleaning the surface of a concrete crack (5), and respectively arranging a grouting port and a slurry pumping port at two ends of the concrete crack (5); s12, installing a sealing assembly (4) outside the concrete crack (5), and smearing an epoxy sealing layer between the sealing assembly (4) and the concrete crack (5); s2, system connection and debugging, including steps S21-S23; s21, connecting a grouting system, a slurry pumping system and a filtering system (3) through a circulating pipeline; S22, adding the two-component epoxy resin grouting material into a grouting storage tank and uniformly stirring; S23, debugging a grouting pump (11) and a slurry pumping pump (21), and setting initial grouting pressure and slurry pumping negative pressure; S3, carrying out primary grouting and impurity removal, namely starting a grouting pump (11), grouting epoxy resin grouting material into a concrete crack (5) through a grouting pipe (13), and stopping grouting when continuous slurry outflow occurs in a grouting pipe (23); s4, pulp pumping and classified filtering, wherein the step S41-S42 comprises the steps of: S41, starting a slurry pump (21), and pumping impurity-containing slurry carrying impurities in a concrete crack (5) through a slurry pumping pipe (23) in a negative pressure slurry pumping mode and feeding the slurry into an impurity collecting tank (22) for buffering; S42, feeding the slurry buffered in the impurity collection tank (22) into a filtering system (3); s5, re-stirring and secondary grouting, wherein the method comprises the following steps of S51-S52: S51, delivering the filtered clean epoxy resin grouting material into a grouting material storage tank through a return pipe and a return pump (15), and re-stirring and mixing the filtered clean epoxy resin grouting material with the existing grouting material in the grouting material storage tank and the newly added grouting material; S52, performing secondary grouting on the concrete cracks (5); s6, repeating the circulation process of the steps S3-S5, and adjusting the circulation times according to the impurity content in the concrete cracks (5) until the impurity content in the extracted slurry is lower than 0.01% (mass fraction); s7, final grouting and curing, including the steps of S71 and S72: s71, after the circulation dialysis is completed, closing the slurry pumping system and the filtering system (3), keeping the grouting pump (11) to operate, and grouting the cracks in the final period; s72, closing a grouting pump (11) after grouting is completed, sealing a grouting opening and a grouting opening, standing and solidifying; And S8, post-monitoring, wherein the post-monitoring comprises the steps of S82-S82: S81, after the grouting material is completely solidified, removing the sealing assembly (4) and the circulating pipeline, and cleaning the redundant grouting material on the surface of the crack; S82, detecting the bonding strength of the grouting material and the concrete by adopting a splitting tensile test, ensuring that the bonding strength is not lower than the tensile strength of the concrete body, and simultaneously detecting the filling compactness of cracks by adopting ultrasonic waves.
  8. 8. The method of claim 7, wherein the step S4 further comprises a step S43 of monitoring the pressure difference between the inlet end and the outlet end of the filter system (3) in real time, and switching the filter unit and cleaning the filter residue if the pressure difference is greater than 0.1 MPa.
  9. 9. The method for repairing the concrete cracks by grouting with epoxy resin based on the dialysis principle according to claim 7, wherein the distance between a grouting opening and a grouting opening is not less than 1/3 of the length of the cracks, and the depth of the grouting pipe (13) and the grouting pipe (23) penetrating into the concrete cracks (5) is not less than 10cm.

Description

System and method for repairing concrete crack by epoxy resin grouting based on dialysis principle Technical Field The invention belongs to the technical field of concrete crack repair, and particularly relates to a system and a method for repairing concrete cracks by grouting with epoxy resin, which are suitable for reinforcing and repairing concrete cracks containing moisture, dust, alkali educts and other impurities. Background In the construction, use and service processes of the concrete structure, cracks are easily generated due to factors such as temperature, stress, load action and the like, the existence of the cracks can reduce the integrity, bearing capacity and durability of the structure, the corrosion of internal steel bars is accelerated, and the service life of the concrete structure is shortened, so that the cracks are required to be repaired in time. The chemical grouting method is one of the mainstream technologies of concrete crack repair, wherein the epoxy resin grouting material is widely applied to various concrete crack repair projects due to the characteristics of high bonding strength, excellent mechanical property, small curing shrinkage and the like. However, in an actual engineering scene, water, construction dust and alkali substances (such as calcium hydroxide) precipitated in the hydration process of the concrete are often remained in the concrete crack, and the impurities seriously damage the interfacial bonding performance of the epoxy resin grouting material and the concrete crack wall, so that the grouting material cannot be effectively combined with the crack wall, the problem of poor bonding occurs, the repairing effect is greatly reduced, even the repairing failure is caused, and the aims of structural reinforcement and durability improvement cannot be realized. In the prior art, the treatment mode for impurities in cracks is mainly pre-cleaning, such as compressed air purging, high-pressure water flushing and chemical solvent flushing. The compressed air purging can only remove part of dust in the cracks, dust and adsorptive moisture in the depths of the cracks cannot be removed, the high-pressure water purging can remove part of impurities, but more moisture can remain in the cracks, so that the effective bonding of the epoxy resin grouting material is reduced, new chemical impurities are easily introduced during chemical solvent purging, and the bonding strength of the epoxy resin grouting material is reduced. The method has the problems of incomplete cleaning, complex operation and poor suitability, and cannot fundamentally solve the influence of impurities on the adhesive property. In addition, the existing epoxy resin grouting technology adopts a single grouting mode or a repeated grouting mode for many times, and only the compactness of grouting can be improved by increasing the grouting amount, but impurity removal on the surface of a crack cannot be realized, so that the bonding strength is reduced, and the repairing effect is reduced. Therefore, a concrete crack repairing technology capable of synchronously realizing impurity removal and grouting reinforcement and improving interface bonding performance is needed. Disclosure of Invention The invention aims to provide a system and a method for grouting and repairing concrete cracks by epoxy resin based on a dialysis principle, which are used for solving the problems in the background technology. The aim of the invention is realized by the following technical scheme: A concrete crack epoxy resin grouting repair system based on a dialysis principle comprises a grouting system, a slurry pumping system and a filtering system; The grouting system comprises a grouting pump, a grouting material storage tank and a grouting pipe; the pulp pumping system comprises a pulp pumping pump, an impurity collecting tank and a pulp pumping pipe; The inlet end and the outlet end of the filtering system are respectively connected with the impurity collection tank and the grouting material storage tank, and the filtering system comprises a rough filtering unit, a fine filtering unit and an adsorption unit which are sequentially connected in series from the inlet end to the outlet end; The concrete crack is equipped with grout mouth, take out thick liquid mouth and seal assembly, seal assembly covers outside the concrete crack, grout pipe and take out thick liquid pipe pass seal assembly connect and be connected with grout mouth and take out thick liquid mouth respectively, grout system, concrete crack, take out thick liquid system, filtration system pass through the pipe connection and form the circulation flow path. Further, the rough filtering unit adopts a metal filter screen with the filtering precision of 50-100 mu m, the fine filtering unit adopts a high molecular filter membrane with the filtering precision of 0.1-10 mu m, and the adsorption unit comprises a filled molecular sieve, water-absorbing resin and ion exchange resi