Repair structure for defect facade on underwater concrete structure
By installing anchor bars, steel mesh, and baffles on underwater concrete structures, combined with underwater epoxy mortar, the problem of detecting and repairing defects in underwater concrete facades has been solved, achieving rapid and economical repair results.
Patent Information
- Application Number
- CN202422898091.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Defects in the facade of underwater concrete structures caused by high-speed water flow are difficult to detect and repair, especially for structures below the waterline. Existing technologies are ineffective for repair, and underwater repair processes are complex and uneconomical.
The structure employs a combination of anchor bars, steel mesh, baffles, and underwater epoxy mortar. The anchor bars are embedded in the concrete structure, the steel mesh is connected to the anchor bars, the baffles cover defects and form a pouring space, and underwater epoxy mortar is injected through the pouring port and drainage port, which enhances the structural strength after setting.
It enables rapid repair of defective underwater concrete structures, enhances the bonding force and strength between the repair materials and the original concrete structure, simplifies the repair process, and reduces economic costs.
Smart Images
Figure CN223688962U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of repair structures of defect vertical surface on underwater concrete structure. BACKGROUND
[0002] Under the long-term scour of water flow, the concrete vertical surface parts of the flow passing structures (such as spillway, sluice, diversion bottom hole, etc.) of hydropower station are often subjected to various defects such as scouring pits and spalling during operation, especially when the high-speed water flow contains bed load or suspended load, the damage is more serious, which may affect the service life of the flow passing structures of hydropower station and even normal operation.
[0003] For structures below the water level line, especially those that can be reached by diving technology, it is difficult to assess and detect the concrete vertical surface defects using conventional technical means such as underwater robots. At the same time, the repair difficulty is closely related to the selection of materials and underwater repair technology, so underwater vertical surface repair has always been a difficult problem. The measures of repairing after emptying many flow passing structures are also not economical compared to underwater repair. With the increase of the operating life of hydropower stations, the scouring condition of the concrete vertical surface structure of the flow passing structures is becoming more and more severe, which has become one of the main diseases of hydropower station operation, so underwater concrete vertical surface rapid repair is imminent. SUMMARY
[0004] The technical problem to be solved by the utility model is: To solve the above technical problems, the utility model provides a repair structure of defect vertical surface on underwater concrete structure.
[0005] The technical scheme adopted by the utility model is: A repair structure of defect vertical surface on underwater concrete structure has:
[0006] Anchor reinforcement, which is anchored into the concrete structure along the direction perpendicular to the surface of the defect vertical surface at the defect position on the concrete structure;
[0007] Steel mesh, which is arranged along the direction parallel to the surface of the defect vertical surface at the defect position on the concrete structure, and the steel mesh is installed on the anchor reinforcement;
[0008] Baffle, which is installed on the defect vertical surface of the concrete structure, the baffle can cover the defects on the defect vertical surface, and the top position of the baffle is provided with a pouring opening and a drainage opening leading to the defect position on the defect vertical surface;
[0009] The pouring body is formed by the condensation of the pouring material poured through the pouring opening on the baffle to the defect position on the defect facade. In this way, by anchoring the anchor bar into the concrete structure and connecting the reinforcing mesh with the anchor bar, the anchor bar and the reinforcing mesh are fixed and installed at the defect position of the concrete structure. After the baffle is installed on the defect facade of the concrete structure, a space is formed between the baffle and the defect on the concrete structure. After the pouring material is poured into the space through the pouring opening on the baffle, the accumulated water in the space is squeezed out from the drain opening. After the pouring material in the space is condensed into the pouring body, the pouring body is bonded together with the original concrete structure under the action of the anchor bar and the reinforcing mesh. The anchor bar and the reinforcing mesh can also enhance the structural strength of the pouring body.
[0010] The anchor bar is arranged in a plum blossom shape. In this way, when the pouring body is filled to the defect position on the concrete structure, the anchor bar is anchored into the pouring body, and the plum blossom arrangement has better structural stability.
[0011] An installation hole is drilled at the position where the anchor bar is installed on the defect facade. Epoxy structural adhesive is injected into the installation hole, which can bond the anchor bar with the concrete structure after the anchor bar is implanted into the installation hole. In this way, the anchor bar is fixed and installed on the concrete structure.
[0012] The reinforcing mesh is connected with the anchor bar by welding or binding. In this way, the reinforcing mesh is installed on the anchor bar of the concrete structure.
[0013] The pouring material is underwater epoxy mortar. In this way, the underwater epoxy mortar has the characteristics of high compressive strength, good bonding performance, adjustable curing time, and good durability.
[0014] A first positioning hole is drilled at the defect position on the defect facade of the concrete structure. A second positioning hole is drilled on the baffle at a position corresponding to the first positioning hole. The baffle and the concrete structure are connected by bolts installed in the first positioning hole and the second positioning hole at the corresponding positions. In this way, the baffle can be easily disassembled on the concrete structure. When the pouring body is poured on the concrete structure, the baffle is installed on the concrete structure. After the pouring body is condensed, the baffle is removed from the concrete structure.
[0015] A release agent is coated on the side surface of the baffle near the side of the concrete structure. In this way, the baffle can be easily removed from the concrete structure after the pouring body is condensed.
[0016] A sealing gasket is provided on the side surface of the baffle near the side of the concrete structure. When the baffle is installed on the concrete structure, the sealing gasket is arranged at the position around the defect. In this way, when the baffle is installed on the concrete structure and the pouring material is poured into the space between the concrete structure and the baffle, the pouring material can be effectively prevented from leaking out from the gap between the concrete structure and the baffle.
[0017] The depth of the anchor bar anchored into the concrete structure is 200mm, the distance between two adjacent anchor bars is 250mm, and the diameter of the anchor bar is 12mm.
[0018] The defect position on the defect vertical surface of the concrete structure is cut, and the opening of the defect position is in the dovetail groove form.
[0019] The utility model discloses a beneficial effect is: the utility model discloses a baffle is installed on the defect position of underwater concrete structure, and the baffle covers the defect, and the baffle is made of 1mm thick thin steel sheet, forms the space between concrete structure defect and baffle, and can be with the original vertical surface concrete base surface form the smooth transition through external force with the shape, pours underwater epoxy mortar in the space between the baffle and the defect of concrete structure, and the underwater epoxy mortar can be solid together with concrete structure after setting, and the repair of the defect on the concrete structure is completed, the first positioning hole is drilled on the position of the defect of concrete structure, and the second positioning hole is drilled on the corresponding position of the baffle, and the baffle is installed on the concrete structure by installing the bolt in the corresponding first positioning hole and second positioning hole, and the baffle is removed from the concrete structure by removing the bolt after the underwater epoxy mortar sets, the release agent is coated on the side of the baffle close to the concrete structure, and the baffle is removed from the concrete structure after the underwater epoxy mortar sets, the sealing pad is installed on the side of the baffle close to the concrete structure, and the sealing pad is arranged at the position around the defect when the baffle is installed on the concrete structure, so that the sealing pad can seal the gap between the baffle and the concrete structure when the baffle is installed on the concrete structure, and the underwater epoxy mortar is prevented from leaking from the gap between the sealing baffle and the concrete structure when pouring the underwater epoxy mortar on the defect position of the concrete structure, the pouring port and the drainage port are arranged on the baffle, and the underwater epoxy mortar is self-leveling in the defect of the internal concrete structure through the pouring port, and the accumulated water in the defect is drained through the drainage port during the pouring process of the underwater epoxy mortar, the installation hole is drilled on the defect position of the concrete structure, and the underwater epoxy structural adhesive is injected into the installation hole, so that the anchor bar and the concrete structure are solid together under the action of the underwater epoxy structural adhesive when the anchor bar is installed in the installation hole, the steel mesh is installed on the anchor bar, and the anchor bar and the steel mesh are fixed in the epoxy mortar after the underwater epoxy mortar poured in the space between the baffle and the defect of the concrete structure sets, so that the structural strength of the pouring body after the underwater epoxy mortar sets and the connecting strength of the pouring body and the concrete structure are enhanced. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 A structural diagram of a repairing structure for a defective vertical surface of an underwater concrete structure.
[0021] In the figure: 1-anchor bar, 2-reinforcing mesh, 3-baffle, 4-pouring body, 5-mounting hole, 6-pouring opening, 7-dovetail groove, 8-drainage opening, 9-sealing gasket, 10-expansion bolt. DETAILED DESCRIPTION
[0022] The utility model will be further explained in detail below by combining with the drawings and through examples, and the following examples are the explanation of the utility model and the utility model is not limited to the following examples.
[0023] The utility model is a repairing structure for a defective vertical surface of an underwater concrete structure.
[0024] In the example, a baffle is mounted on the defective vertical surface of the underwater concrete structure, and a space is formed between the defect of the concrete structure and the baffle. The first positioning hole is drilled at the position around the defect on the defective vertical surface of the concrete structure, and the second positioning hole is drilled at the corresponding position of the first positioning hole on the baffle. When the baffle is arranged on the concrete structure, the bolt is installed in the first positioning hole and the second positioning hole at the corresponding position and is tightened to realize the fixed installation of the baffle on the concrete structure.
[0025] Further, the sealing gasket is arranged at the position around the defect when the baffle is installed on the concrete structure. In this way, when the baffle is installed on the concrete structure, the sealing gasket can seal the gap between the baffle and the concrete structure, and good sealing effect is achieved.
[0026] In the example, the pouring opening and the drainage opening are made on the baffle. When the baffle is installed on the concrete structure, the pouring opening and the drainage opening are located at the top position of the space between the defect of the concrete structure and the baffle. In this way, when the underwater epoxy mortar is poured into the space through the pouring opening, the underwater epoxy mortar fills the space and drains the accumulated water in the space from the drainage opening.
[0027] In the example, the release agent is coated on the side surface of the baffle near the concrete structure. In this way, after the pouring and setting of the underwater epoxy mortar are completed, the baffle can be easily removed from the concrete structure.
[0028] In this embodiment, the anchor bars are arranged at the defect positions of the concrete structure and anchored into the concrete structure along the surface direction perpendicular to the vertical surface of the defect. The anchor bars are arranged in a quincunx arrangement. When arranging the anchor bars, installation holes are first drilled at the corresponding positions. After the installation hole drilling operation is completed by using a pneumatic drill or a hydraulic drill, the hole is cleaned by using high-pressure water to remove the dirt and sediment in the hole so that the hole wall is free of dust adhesion. The installation hole is injected with HK-983 underwater epoxy structural adhesive by using a special glue gun, and the anchor bar is implanted. The filling amount of the underwater epoxy structural adhesive satisfies that the annular space around the anchor bar is filled after the anchor bar is inserted to the bottom of the hole. After being inserted, the anchor bar is rotated several times so that the structural adhesive is tightly adhered to the anchor bar and the hole wall to increase the anchoring force. The depth of the anchor bar anchored into the concrete structure is 200 mm, the spacing between the two adjacent anchor bars is 250 mm, and the diameter of the anchor bar is 12 mm.
[0029] In this embodiment, after the anchor bars are arranged and the underwater epoxy structural adhesive is cured, the steel mesh is arranged at the end of the anchor bar. The steel mesh and the anchor bar are connected by electric welding or steel wire binding. When the underwater epoxy mortar is poured in the space between the defect of the concrete structure and the baffle, the anchor bar and the steel mesh are arranged in the underwater epoxy mortar. After the underwater epoxy mortar is cured into a pouring body, the anchor bar and the steel mesh are fixed in the pouring body, which enhances the structural strength of the pouring body and the connection strength between the pouring body and the concrete structure. The specification of the steel mesh is φ12@200x200, that is, the diameter of the transverse steel bar and the longitudinal steel bar in the steel mesh is 12 mm, the spacing between the two adjacent transverse steel bars is 200 mm, and the spacing between the two adjacent longitudinal steel bars is 200 mm.
[0030] The construction method of this embodiment is as follows:
[0031] Lofting: According to the underwater inspection result, the defect position is preliminarily judged. After entering the water to the defect position, the concrete defect position is positioned, inspected and reviewed in detail by using a steel tape, a cloth tape and other measuring tools, and the concrete defect characteristics are described, including the defect position, length, width, depth, trend and other conditions.
[0032] Cutting: A pneumatic cutting machine is used to cut a regular repair edge line along the defect edge. The cutting depth is determined according to the depth of the defect. The cutting depth should be deep into the original broken concrete layer to form a dovetail groove. The unique shape of the dovetail groove can provide mechanical engagement after the repair material is cured to prevent the repair material from falling off and improve the bonding force between the underwater epoxy mortar and the original concrete.
[0033] Chiseling and cleaning: The pneumatic mechanical equipment is used to chisel and clean the concrete. The chiseling and cleaning should completely remove all loose, damaged, delaminated, deteriorated or weak concrete layers, and pollutants such as grease and adhesive. After chiseling and cleaning, the surface of the coarse aggregate should be exposed.
[0034] Drilling installation holes: To enhance the integrity between the original concrete structure and the newly poured concrete, it is necessary to drill holes for rebar installation. Generally, pneumatic or hydraulic drills are used for drilling, with a hole depth of 20cm, a diameter of 16mm, and a hole spacing of 25cm, arranged in a staggered pattern. After drilling, high-pressure water is used to remove rock debris and sediment from the holes, ensuring the hole walls are free of dust.
[0035] Rebar installation: After drilling and cleaning, HK-983 underwater epoxy structural adhesive is injected through a special glue gun, and anchor bars with a diameter of 12mm are inserted. The amount of epoxy structural adhesive is sufficient to fill the annular space around the anchor bar after it is inserted to the bottom of the hole. After inserting the anchor bar, rotate it several times to make the structural adhesive fully adhere to the anchor bar and the hole wall, thereby increasing the anchoring force.
[0036] Installing the steel mesh: After the epoxy anchoring agent reaches the specified strength, the steel mesh, which has been prefabricated on land, will be hoisted into the water by a gantry crane or winch. The steel mesh and the anchor bars will be connected by underwater electric welding and steel wire binding.
[0037] Secondary cleaning: Before underwater epoxy mortar pouring, a high-pressure water gun is needed to clean the defects on the concrete structure, removing floating dust, debris, and aquatic plants and other impurities to ensure that the base surface is clean and free of debris and dust. At the same time, due to the complex underwater water quality, the surface of the newly planted steel bars may have certain attachments and corrosion. The surface of the steel bars needs to be cleaned with a wire brush or copper brush head to improve the bonding strength between the underwater epoxy mortar and the base concrete and steel bars.
[0038] Make baffles: Make baffles on land according to the size and shape of the damaged area. The baffles are made of 1mm thick steel plates and have reserved second positioning holes, pouring ports and drainage ports. Apply waterproof release agent to one side of the baffles and install sealing gaskets.
[0039] Drill positioning holes: Drill the first positioning hole at the location corresponding to the second positioning hole around the defect in the concrete structure;
[0040] Install the baffle: Place the baffle on the concrete structure, so that the side of the baffle coated with release agent and fitted with a sealing gasket is in close contact with the concrete structure. Fix the baffle to the concrete structure by installing expansion bolts in the first positioning hole and the second positioning hole.
[0041] Casting of the concrete body: The mixed underwater epoxy mortar is delivered to the casting point by means of bucket hoisting and water injection. The underwater epoxy mortar is poured into the casting port and flows into the defect through self-leveling and drains the accumulated water. At the same time, observe whether there is any leakage. After filling, seal the casting port and drainage port.
[0042] Curing and maintenance: During the pouring process of the underwater epoxy mortar, a baffle barrier is set around the pouring area if possible, the gate should be closed during pouring to reduce the influence of water flow and water pressure on the underwater epoxy mortar. According to the curing time requirement of the underwater epoxy mortar, the repair area is kept relatively stable to prevent it from being washed away during the curing process;
[0043] Demolding: After the poured underwater epoxy mortar reaches a certain strength, the baffle is removed. The baffle is removed carefully to avoid damaging the concrete surface, and the first positioning hole and gap are repaired with underwater epoxy mortar.
[0044] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.
Claims
1. A repair structure for a defective vertical surface of an underwater concrete structure, characterized by: Having: Anchoring bars (1) are anchored into the concrete structure along the direction perpendicular to the surface of the defect vertical plane at the defect position of the concrete structure; Steel bars (2) are arranged along the direction parallel to the surface of the defect vertical plane at the defect position of the concrete structure, and the steel bars are installed on the anchoring bars; A baffle (3) is installed on the defect vertical plane of the concrete structure, the baffle (3) can cover the defect on the defect vertical plane, and the baffle (3) is provided with a pouring opening (6) and a drainage opening (8) leading to the defect position on the defect vertical plane; A pouring body (4) is formed by the setting of the pouring material poured through the pouring opening (6) of the baffle (3) to the defect position on the defect vertical plane.
2. A repair structure for a defective vertical face of an underwater concrete structure according to claim 1, characterized in that: An installation hole (5) is drilled at the position where the anchoring bar is installed on the defect vertical plane, and underwater epoxy structural adhesive is injected into the installation hole, which can bond the anchoring bar (1) and the concrete structure after the anchoring bar is implanted into the installation hole.
3. The repair structure of a defective vertical surface of an underwater concrete structure according to claim 1, characterized in that: The steel bars (2) are connected with the anchoring bars (1) by welding or binding.
4. The repair structure for a defective vertical surface of an underwater concrete structure according to claim 1, characterized by: The pouring body (4) is underwater epoxy mortar.
5. The repair structure for a defective vertical surface of an underwater concrete structure according to claim 1, characterized by: First positioning holes are drilled at the positions around the defect on the defect vertical plane of the concrete structure, and second positioning holes are drilled on the baffle at positions corresponding to the first positioning holes, and the baffle (3) and the concrete structure are connected by expansion bolts (10) installed in the first positioning holes and the second positioning holes at the corresponding positions.
6. The repair structure for a defective vertical surface of an underwater concrete structure according to claim 1, characterized by: The baffle (3) is coated with a release agent on the side surface adjacent to the concrete structure.
7. The repair structure for a defective vertical surface of an underwater concrete structure according to claim 1, characterized by: A sealing gasket (9) is provided on the side surface adjacent to the concrete structure on the baffle (3).
8. The repair structure of a defective vertical face of an underwater concrete structure according to claim 1, characterized in that: The anchoring bars are arranged in a quincunx pattern.
9. The repair structure of a defective vertical face of an underwater concrete structure according to claim 1, characterized in that: The depth of the anchor bar (1) anchored into the concrete structure is 200 mm, the spacing between two adjacent anchor bars is 250 mm, the diameter of the anchor bar is 12 mm, and the specification of the steel bar mesh is .
10. The repair structure for a defective vertical face of an underwater concrete structure according to claim 1, characterized by: The defect site on the defect vertical plane of the concrete structure is cut and treated, and the opening of the defect site is formed into a dovetail groove (7).