CN-115961976-B - Concrete structure cavity seepage-running water application stable anchoring and grouting repairing method

Abstract

The invention discloses a concrete structure cavity seepage-running water application stable anchoring and grouting repairing method. The anchor grouting repairing method comprises the steps of 1) defining a repairing treatment range according to detection and finding out leakage and running water positions according to the situation, conducting drainage treatment, 2) cleaning a cavity treatment surface, 3) brushing an interface agent on the cleaning surface and applying non-woven fabrics, 4) arranging anchor grouting holes (deep holes) and grouting holes (shallow holes) on the non-woven fabrics, 5) conducting anchor grouting firstly and grouting holes later, 6) conducting composite grouting treatment on drainage holes, and after solidification, cleaning grouting pipe orifices and conducting surface finishing. The invention adopts the cracked and wet concrete on the surface of the cavity of the stabilized concrete, can effectively solve the problems of wet surface adhesion and slurry hydrophilic surface permeation adhesion of the wet concrete, effectively controls unstable dropping of cracked concrete at the cavity position, and ensures the running safety of a train without generating slump dropping blocks due to the stability of cracked concrete at the surface layer in filling grouting in the cavity position.

Inventors

• QIU XIAOPEI

Assignees

• 广州市泰利斯固结补强工程有限公司

Dates

Publication Date

20260505

Application Date

20230104

Claims (1)

1. 1. A concrete structure cavity seepage-running water application stable anchoring and grouting repairing method is characterized by comprising the following steps of: 1) Before construction, when broken concrete blocks fall off to form a cavity on a broken surface of a large-area cavity, the formed cavity is repaired firstly to form a closed surface with the cavity surface; in the step 1), firstly, conducting drainage treatment according to the conditions of cavity, cavity position leakage and running water, conducting drainage to drain the leakage and running water to a ditch, repairing the cavity position of the broken surface of the cavity, and then conducting stable anchoring and reinforcing treatment of the cavity position covering; the cavity repairing method comprises the following steps: cleaning the cavity, implanting an expansion screw, brushing an interface agent, layering, filling epoxy repair mortar and an embedded grouting pipe, grouting the embedded pipe, and modifying the surface; 2) In the step 2), the detected broken surface cavity position is subjected to basal surface cleaning, leakage and running water points are searched in the cleaning, and leakage and running water are led and discharged into an interval ditch; 3) In the step 3), the interface agent of the epoxy material is cleaned and coated on the concrete basal plane of the disintegrated cavity position which is cleaned, drained and drained, and the interface agent is repeatedly coated, so that the interface agent is fully adsorbed by the concrete to form an initial mucous membrane layer, and then the pre-cut non-woven fabric is coated on the mucous membrane layer of the interface agent, so that the interface agent is required to be leveled and free of bubbles; 4) Distributing holes on the surface of the non-woven fabric, distributing holes on the surface layer of the non-woven fabric after the non-woven fabric is coagulated in the step 4), distributing the anchoring holes and grouting holes, wherein the distance between the anchoring holes is 40cm, the depth of the anchoring holes is 8-10 cm higher than that of solid concrete at the bottom of the cavity, and the depth of the grouting holes is 3-5 cm lower than the cavity; Grouting the anchoring holes by cement, wherein the water cement ratio is 0.6-1:1, and the grouting pressure is 0.1-0.2 mpa, grouting by epoxy grouting materials, and grouting by the grouting pressure of 0.2-0.3 mpa, so that the anchoring holes and grouting pipes form an anchoring pull bolt, the application surface layer of the cavity position concrete of the fracture surface is stabilized, and weight gain and falling in the grouting process are prevented; 5) Grouting the grouting holes with epoxy grouting materials, enhancing the binding force between cement paste in the cavity bottom and structural concrete, and applying grouting pressure of 0.3-0.4 mpa, wherein repeated grouting is required to be carried out for a plurality of times, so as to ensure the infiltration consolidation reinforcing effect of the inner side surface of the cracked concrete; 6) And 6) performing composite grouting on the drainage holes, removing the grouting pipe orifice after the drainage holes are coagulated, performing composite grouting on cement paste epoxy grouting materials on the cavity position drainage holes, performing water stopping and reinforcing treatment on the cavity position leakage-flow water level, and removing the grouting pipe orifice after the drainage holes are coagulated.

Description

Concrete structure cavity seepage-running water application stable anchoring and grouting repairing method Technical Field The invention relates to a repairing method for cavities and hollows of a concrete structure, belongs to the technical field of subway concrete construction, and particularly relates to a repairing method for a concrete structure cavity by means of seepage-running water application stable anchoring. Background The underground excavation method is adopted to construct the subway concrete structure tunnel, and the air in the template cannot be effectively discharged or leaked during the concrete casting and tamping process due to the fact that the over excavation exists on the excavated soil body in the construction period, so that cavities with different sizes are formed locally by the concrete. The cement slurry or cement mortar on the outer surface of the cavity is influenced by train running vibration and water leakage corrosion, the concrete layer on the outer surface of the cavity is cracked, and the cracked block positions form cavities. The cavity and the cavity are affected by the external water head to cause the problem of leakage and running water. The broken surface of the cavity position can be broken at any time when the tunnel appears, and hidden danger of disease exists for the operation safety of subway trains. A conventional repairing treatment method for cavities and hollows of a concrete structure. Method for repairing cavity by pouring and tamping again by removing broken concrete on surface of cavity ① Setting a construction operation platform, ② removing concrete on the cavity surface, ③ draining water and running water, ④ setting a template, ⑤ pouring concrete again, ⑥ grouting and sealing water holes after solidification, ⑦ removing the template after solidification, and ⑧ recovering train operation. There are problems: 1. and the residual mud amount for clearing and cleaning the concrete is too large, the repairing backfill amount is increased, and the work amount for clearing and re-pouring the concrete is large. 2. And setting a construction operation platform and a vertical formwork, wherein the railway is occupied and subway trains cannot pass. 3. Due to the long construction period, the shutdown of the train has a certain influence on the social traffic. Second, cavity site backfill grouting repairing method ① The method comprises the steps of supporting a formwork by a vertical frame for a cavity, carrying out ② drainage on water leakage and flowing water, carrying out filling grouting on materials such as cement and the like for the cavity by ③, carrying out sealing grouting on drainage holes by ④, and removing the formwork after ⑤ is solidified. There are problems: because the surface layer concrete of the cavity is broken and has poor self-stability, the broken surface is easy to fall off in a large area due to direct backfilling grouting, and a bracket template is required to be set. The support templates occupy the tracks, and the trains cannot pass. The construction period and the time for filling the cement paste to be coagulated lead to the shutdown of the train, and have certain influence on social traffic. Repairing method by adopting externally-attached steel plate ① The method comprises the steps of draining water and flowing water at the cavity, cleaning a concrete base surface at the cavity ②, externally attaching a steel plate ③, filling grouting (drainage holes) at the cavity into reserved grouting holes of the steel plate after ④ is solidified, and removing the grouting holes after ⑤ is solidified. There are problems: 1. If the cavity is positioned on the tunnel roof arch, when the contact net is arranged below the cavity, the steel plate is easy to generate high-voltage static current, so that the safe operation of the train is influenced and the tunnel concrete is not beneficial. 2. During the process of the steel plate pasting installation and the cavity filling grouting, the train cannot normally run. 3. The repairing cost is high by adopting the steel plate for pasting. Fourth, repair method adopting externally-attached aramid cloth The problems of water seepage, water leakage and running water exist in the semicircular cavity position on the tunnel generally, the problem of wet seepage exists in the broken concrete at the cavity position, and the adhesive stuck by the aramid fiber cloth material cannot be stuck on the wet-seepage broken concrete base surface. In the train running vibration and cavity filling grouting process, the aramid cloth can fall off at any time, and the safe running of the train is affected. Disclosure of Invention Aiming at the defects and shortcomings of the prior art, the invention aims to provide a concrete structure cavity seepage-running water application stable anchoring and grouting repairing method, which adopts the application of cracked and wet concrete on the surface of a stable cavity, can effective