Repairing method for spillway concrete side wall

Abstract

The invention relates to a spillway concrete side wall repairing method. The spillway concrete side wall repairing method sequentially comprises the following steps that S1, the damaged surface of an original concrete structure is removed; s2, punching holes in the surface of the original concrete structure after the damaged surface is removed to form a plurality of holes for planting the steel bars, and respectively planting a plurality of connecting steel bars into the corresponding holes for planting the steel bars; s3, after the surface of the original concrete structure is cleaned up, the surface of the original concrete structure is coated with an adhesive, and an adhesive layer is formed; s4, arranging a surface layer reinforcing mesh on the surface of the original concrete structure; s5, surface layer concrete is poured on the surface of the original concrete structure, and a concrete surface layer is formed; and S6, surface anti-carbonization treatment is conducted on the concrete surface layer, and an anti-carbonization surface is formed. The strength of the repaired concrete structure can be improved, the service life is prolonged, and the adaptability to freezing and other related severe environments is improved.

Description

Technical Field

[0001] The invention relates to a method for repairing a spillway concrete side wall. Background Art

[0002] During operation, the spillway of a reservoir is affected by water scouring, soaking or cold weather, resulting in leaking reinforcement and concrete erosion on the concrete surface. Concrete grouting and surface repair are usually used to repair the damage. However, the bonding strength between the new and old concrete in this type of repair method is low. In the harsh outdoor environment where the spillway is located, due to the destructive effects of freeze-thaw cycles and chemical erosion, the concrete is prone to spalling and loosening, and its durability is reduced, making it difficult to meet the bearing capacity and service life requirements of the spillway side wall structure. Summary of the invention

[0003] The purpose of the present invention is to improve the strength of the repaired concrete structure, extend its service life, and improve its adaptability to harsh environments such as freezing.

[0004] The technical solution of the present invention is: a method for repairing a spillway concrete side wall, comprising the following steps implemented in sequence: S1. Remove the damaged surface of the original concrete structure; S2. drilling holes on the surface of the original concrete structure after the damaged surface is removed to form a plurality of holes for embedding reinforcement, and embedding a plurality of connecting steel bars into the respective corresponding holes for embedding reinforcement; S3. After cleaning the surface of the original concrete structure, an adhesive is applied to the surface of the original concrete structure to form an adhesive layer; S4. Install a surface steel mesh on the surface of the original concrete structure; S5. pouring surface concrete on the surface of the original concrete structure to form a concrete surface layer; S6. Carry out anti-carbonization treatment on the concrete surface layer to form an anti-carbonization surface.

[0005] Furthermore, in step S1, the surface should be cleaned at least until the surface of the original concrete structure becomes an undamaged fresh concrete surface.

[0006] Preferably, in step S1, a jackhammer may be used to break the damaged surface.

[0007] Preferably, in step 2, the holes for planting the reinforcement are perpendicular to (substantially perpendicular to) the surface of the original concrete structure after the damaged surface is removed.

[0008] Preferably, in step 2, the lower part of the connecting steel bar is anchored in the hole for planting steel bars, and the upper part is exposed from the surface of the original concrete structure by a certain length, so that the upper part of the connecting steel bar can pass through the surface steel mesh and its end is located in the concrete surface layer (after setting the concrete surface layer).

[0009] Preferably, the connection steel bars and the holes for planting the steel bars are both distributed in a plum blossom pattern.

[0010] Preferably, in step 3, the adhesive used is a modified epoxy adhesive suitable for concrete.

[0011] Furthermore, in step 3, the adhesive should cover the entire surface of the original concrete structure (the entire surface within the scope of repair).

[0012] Preferably, in step 3, the adhesive is also applied to the connecting steel bars exposed from the surface of the original concrete structure.

[0013] Furthermore, in step 3, the adhesive should cover the entire surface of the connecting steel bars exposed from the surface of the original concrete structure without leaving any defects such as bubbles.

[0014] Preferably, in step 3, the adhesive is applied by brushing.

[0015] Preferably, in step 5, the surface layer concrete used is self-compacting concrete.

[0016] Furthermore, a steel bar protection layer (or protective layer) should be provided in the concrete surface layer.

[0017] Preferably, the thickness of the steel bar protective layer is not less than 50 mm.

[0018] Preferably, in step 6, the surface anti-carbonization treatment is carried out by coating a polyurea coating.

[0019] The beneficial effects of the present invention are as follows: 1) through the reasonable configuration between each layer and the implantation of connecting steel bars, the repaired concrete and the original concrete have good adhesion, which effectively improves and ensures the overall strength and rigidity of the spillway side wall. Field experiments show that the strength of the repaired concrete can reach or approach the original design strength; 2) by adopting the plum blossom type arrangement of connecting steel bars, it is helpful to save the amount of steel bars, ensure the overall strength and strength of each part, reduce local damage, and reduce the probability of large-scale damage caused by local damage; 3) by improving the interlayer and internal structure, the anti-freeze performance is improved, especially for the cold northern regions, the damage to the concrete structure caused by the freeze-thaw cycle is significantly reduced; 4) by applying polyurea on the surface for anti-carbonization treatment, an effective protective layer is formed on the concrete surface, while also avoiding the rusting of steel bars, maintaining the bearing capacity and stability of the structure.

[0020] The invention is suitable for repairing the damaged concrete of the spillway side wall, and can also be used for repairing the damaged concrete structure in other occasions, especially in relevant severe occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a concrete damage repair structure involved in the present invention; Figure 2 It is a schematic diagram of the distribution of the neutral reinforcement (connecting reinforcement) in the concrete damage repair structure involved in the present invention; Figure 3 is with Figure 1 A partial enlarged view of the corresponding concrete damage repair structure. DETAILED DESCRIPTION

[0022] See also Figure 1-Figure 3 The present invention is a construction method for repairing concrete damage, which can be used to modify the surface damage of the spillway side wall and concrete structures in harsh occasions, especially for the side wall position with severe damage, exposed reinforcement, concrete erosion, and damage depth greater than 100mm, to solve the problems of insufficient bonding strength and poor durability of the spillway side wall concrete, and ensure the quality of the spillway side wall concrete repair.

[0023] The main construction process of this method is: chiseling and cleaning the damaged concrete → planting reinforcement → applying adhesive → hanging reinforcement mesh → pouring self-compacting concrete → applying polyurea coating.

[0024] Specifically, they may include: 1) Use appropriate methods such as jackhammers to break the damaged surface of the concrete structure to be repaired (e.g., the side wall of the spillway) to expose the fresh concrete surface, and retain the original steel bars (the original steel bars in the broken area). After the surface concrete is poured, the original steel bars exposed from the original concrete structure 1 are consolidated in the surface concrete. The rough surface formed after the surface is broken and the original steel bars consolidated in the surface layer can significantly improve the consolidation / tensile strength of the newly poured concrete surface layer and the original concrete structure.

[0025] For the concrete side walls of the spillway with obvious damage, the thickness of the demolition can usually be 200mm.

[0026] 2) After the damaged part of the surface is chiseled off, holes are drilled on the original concrete structure surface (which can be called the structural surface) and the connecting steel bars are implanted. The holes used for implanting steel bars can usually be perpendicular to the surface of the concrete structure, and the hole diameter and depth are based on actual needs. For example, the diameter of the drill hole is 15mm, φ12 steel bars are implanted, the steel bars are exposed 150mm, and the anchoring depth is 200mm.

[0027] The embedded reinforcement (connecting reinforcement) is preferably arranged in a plum blossom pattern (see Figure 2 For example), the spacing can be 750mm.

[0028] If drilling holes and planting reinforcement at the set position is hindered by the original steel bars, the original steel bars can be slightly offset and holes can be drilled and planted at an adjacent position where they are not hindered.

[0029] 3) After the reinforcement is planted, the original concrete surface is cleaned and coated (e.g., brushed) with an adhesive (e.g., a modified epoxy adhesive) to form an adhesive layer 3. The adhesive should usually be fully coated on the entire structural surface (the original concrete structural surface). At the same time, the adhesive can also be coated on the connecting steel bars exposed from the structural surface to cover the entire exposed surface of the connecting steel bars, thereby effectively preventing the gas and water (gas and liquid substances) remaining on the surface of the connecting steel bars after pouring the surface concrete or penetrating through tiny cracks from eroding / corroding the connecting steel bars.

[0030] 4) After applying the adhesive, hang a steel mesh (for example, φ8@200 steel mesh) on the structural surface to form a surface steel mesh 5, and the exposed connecting steel bars can be used to connect and fix the surface steel mesh. If necessary, a spacer can be set between the steel mesh and the structural surface, or positioning bars (steel bars protruding from the side of the steel mesh) can be prefabricated on one side of the steel mesh (the side facing the structural surface when the mesh is hung), and the positioning bars can be supported on the structural surface to maintain a set distance between the steel mesh and the structural surface.

[0031] 5) Pour the surface concrete on the structural surface to form the concrete surface layer 4. Usually, the thickness of the concrete surface layer can be 200mm, and C40W6F200 self-compacting concrete can be used. After pouring, the surface steel mesh and the connecting steel bars and original steel bars exposed from the structural surface are all consolidated in the concrete surface layer. The thickness of the steel bar protection layer can be set according to actual needs.

[0032] When pouring surface concrete, side formwork can be set according to actual needs.

[0033] 6) The surface of the concrete surface layer is treated with anti-carbonization, for example, by applying polyurea coating to form an anti-carbonization surface layer 6.

[0034] Unless otherwise specified or when one preferred or optional technical means is a further limitation of another technical means, the preferred and optional technical means disclosed in the present invention can be arbitrarily combined to form several different specific implementation methods.

Claims

1. A method for repairing a spillway concrete side wall, characterized in that The method comprises the following steps, which are implemented in sequence: S1. Remove the damaged surface of the original concrete structure; S2. drilling holes on the surface of the original concrete structure after the damaged surface is removed to form a plurality of holes for planting reinforcement, and implanting a plurality of connecting steel bars into the respective corresponding holes for planting reinforcement; S3. Clean the surface of the original concrete structure and apply an adhesive on the surface of the original concrete structure to form an adhesive layer; S4. Set the surface steel mesh based on the surface of the original concrete structure; S5. pouring surface concrete on the surface of the original concrete structure to form a concrete surface layer; S6. Perform anti-carbonization treatment on the concrete surface layer to form an anti-carbonization surface.

2. The repair method according to claim 1, characterized in that In step S1, the surface should be cleaned at least until the surface of the original concrete structure becomes an undamaged fresh concrete surface.

3. The repair method according to claim 1, characterized in that In step S1, a pneumatic pick is used to break off the damaged surface.

4. The repair method according to claim 1, characterized in that In step 2, the holes for embedding the reinforcement are perpendicular to the surface of the original concrete structure after the damaged surface is removed.

5. The repair method according to claim 1, characterized in that In step 2, the lower part of the connecting steel bar is anchored in the hole for planting steel bars, and the upper part is exposed from the surface of the original concrete structure by a certain length, so that the upper part of the connecting steel bar can pass through the surface steel mesh and its end is located in the concrete surface layer.

6. The repair method according to claim 1, characterized in that In step 3, the adhesive used is a modified epoxy adhesive suitable for concrete.

7. The repair method according to claim 1, characterized in that In step 3, the adhesive is applied to cover the entire surface of the existing concrete structure.

8. The repair method according to claim 1, characterized in that In step 3, the adhesive is applied by brushing.

9. The repair method according to claim 1, characterized in that In step 5, the surface concrete used is self-compacting concrete.

10. The repair method according to claim 1, characterized in that In step 6, a surface anti-carbonization treatment is performed by coating a polyurea coating.

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