Bridge pier anti-corrosion repairing structure based on marine environment

Abstract

The invention relates to a bridge pier anti-corrosion repairing structure based on the marine environment, the bridge pier anti-corrosion repairing structure comprises a reinforcing connecting layer and a functional layer which are arranged on the outer side of a bridge pier base layer, the reinforcing connecting layer comprises back bolts which are transversely distributed and steel wire meshes which are annularly distributed, the back bolts are anchored on the bridge pier base layer, and the steel wire meshes are annularly fixed on the back bolts; the functional layer is of an ultra-high performance concrete anti-corrosion structure poured on the outer side of the reinforced connecting layer. The back bolt steel wire mesh composite structure is additionally arranged between the base layer bridge pier concrete and the functional layer ultra-high performance concrete to serve as a reinforced connecting layer, so that the base layer and the functional layer form an effective and unified whole, the risks of cracking, sliding and delaminating are avoided, and the service life of the repaired bridge pier is prolonged.

Description

Technical Field

[0001] The invention relates to the field of bridge pier anti-corrosion, and more specifically to a bridge pier anti-corrosion repair structure based on a marine environment. Background Art

[0002] The main function of a bridge pier is to support the span structure, while bearing various external forces and loads to ensure the stability and safety of the bridge. However, for bridge piers built in a complex marine environment, the presence of a large number of corrosive ions in seawater and the scouring of waves cause continuous damage and peeling of the concrete surface, further causing steel corrosion, ultimately affecting its macroscopic mechanical properties and seriously shortening the service life of the bridge pier. Currently, the commonly used repair schemes include: 1) increasing the cross-section reinforcement method, which cannot effectively solve the problem of seawater ion erosion and can only temporarily delay the damage process; 2) external steel reinforcement method can improve the bearing capacity and ductility of the bridge pier, but it is also unable to resist ion erosion damage; 3) spraying anti-corrosion coatings or sticking anti-corrosion films on the surface can prevent ion erosion within its effective time limit, but cannot protect the bridge pier concrete for a long time. In summary, conventional technical means cannot fundamentally solve the problem of ion erosion damage to bridge pier concrete in the marine environment. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a pier anti-corrosion repair structure based on a marine environment, which can solve the problem of ion corrosion damage to the pier concrete in the marine environment.

[0004] The technical solution adopted by the present invention to solve its technical problems is: constructing a pier anti-corrosion repair structure based on the marine environment, including a reinforced connection layer and a functional layer arranged on the outside of the pier base layer, the reinforced connection layer includes laterally distributed back bolts and circumferentially distributed wire mesh, the back bolts are anchored on the pier base layer, the wire mesh is circumferentially fixed on the back bolts, and the functional layer is an ultra-high performance concrete anti-corrosion structure cast on the outside of the reinforced connection layer.

[0005] According to the above solution, the exposed length of the back bolt after anchoring is 50-70 mm.

[0006] According to the above scheme, the pier base has 5-6 anchor bolts per square meter.

[0007] According to the above scheme, the wire mesh is 40-60mm away from the base structure.

[0008] According to the above scheme, the aperture of the steel wire mesh is 110-150mm.

[0009] According to the above scheme, the wire diameter of the steel wire mesh is 3-5mm.

[0010] According to the above solution, the steel wire mesh is circumferentially welded on the back bolt.

[0011] The implementation of the bridge pier anti-corrosion repair structure based on the marine environment of the present invention has the following beneficial effects:

[0012] 1. The present invention adds a back-bolted steel wire mesh composite structure as a reinforcing connection layer between the base pier concrete and the functional layer ultra-high performance concrete, so that the base and the functional layer form an effectively unified whole, avoiding the risk of cracking, slipping and delamination, and improving the service life of the repaired pier.

[0013] 2. The anti-corrosion repair structure of the present invention is easy to construct, has excellent anti-corrosion performance, is free from later maintenance, and has low overall cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0015] Figure 1 It is a cross-sectional schematic diagram of the bridge pier anti-corrosion repair structure based on the marine environment of the present invention;

[0016] Figure 2 It is a top view of the bridge pier anti-corrosion repair structure based on the marine environment of the present invention. DETAILED DESCRIPTION

[0017] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0018] like Figure 1-2 As shown, the pier anti-corrosion repair structure based on the marine environment of the present invention includes a base layer 1, a strengthening connection layer and a functional layer 3.

[0019] The base layer 1 is the existing ordinary concrete structure of the pier. The reinforced connection layer is anchored on the treated pier concrete base layer 1 through back bolts 4, and a layer of wire mesh 2 is fixed in the annular direction. After the outer formwork is supported, the functional layer 3 of ultra-high performance concrete material is poured, so that the base layer 1 and the functional layer 3 form an effectively unified overall structure.

[0020] The base layer 1 is an ordinary concrete structure of the existing bridge pier. A high-pressure water gun is used to wash the existing base layer 1 structure to ensure that the damaged structure is removed and a stable sand and gravel matrix is ​​exposed.

[0021] The reinforced connection layer is a composite structure of laterally distributed back bolts 4 and circumferentially distributed wire mesh 2. After the back bolts 4 are anchored on the treated base 1 concrete, the wire mesh 2 is circumferentially welded on the back bolts 4; the exposed length of the back bolts 4 after anchoring is 50-70mm, and 45-6 back bolts are anchored per square meter; the wire mesh 2 is made of stainless steel, 40-60mm away from the base 1 structure, with an aperture of 110mm or 150mm and a wire diameter of 3-5mm.

[0022] Functional layer 3 is an ultra-high performance concrete anti-corrosion structure, the ultra-high performance concrete strength grade is ≥C120, the 28d drying shrinkage rate is ≤300με, and the expansion is 700±50mm.

[0023] After completing the construction of the connection layer, support the outer formwork and control the pouring thickness of the functional layer 3 to 80-120mm. Before pouring the ultra-high performance concrete material, ensure that the surface of the base 1 structure is in a moist state. No vibration is required during the pouring process. Demoulding is performed 3-7 days after the pouring is completed, and wet curing is performed for 7-14 days after demolding.

[0024] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A bridge pier anti-corrosion repair structure based on marine environment, characterized in that: It includes a reinforced connection layer and a functional layer arranged on the outside of the pier base. The reinforced connection layer includes laterally distributed back bolts and circumferentially distributed wire meshes. The back bolts are anchored on the pier base, and the wire meshes are circumferentially fixed on the back bolts. The functional layer is an ultra-high performance concrete anti-corrosion structure cast on the outside of the reinforced connection layer.

2. The pier anti-corrosion repair structure based on the marine environment according to claim 1 is characterized in that: The exposed length of the back bolt after anchoring is 50-70 mm.

3. The pier anti-corrosion repair structure based on the marine environment according to claim 1 is characterized in that: The pier base has 5 to 6 anchor bolts per square meter.

4. The pier anti-corrosion repair structure based on the marine environment according to claim 1 is characterized in that: The steel wire mesh is 40-60 mm away from the base structure.

5. The pier anti-corrosion repair structure based on the marine environment according to claim 1 is characterized in that: The pore size of the steel wire mesh is 110-150 mm.

6. The pier anti-corrosion repair structure based on the marine environment according to claim 1 is characterized in that: The wire diameter of the steel wire mesh is 3-5 mm.

7. The bridge pier anti-corrosion repair structure based on the marine environment according to claim 1 is characterized in that: The steel wire mesh is circumferentially welded on the back bolt.

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