Local reinforcing device of marine concrete pile and construction method of local reinforcing device

Abstract

The invention discloses a local reinforcing device of a marine concrete pile and a construction method of the local reinforcing device, and belongs to the technical field of pile foundation construction engineering.The local reinforcing device comprises a reinforced concrete pipe pile, a steel pipe with an epoxy anti-corrosion coating and annular positioning hoops, and the upper end and the lower end of the outer wall of the steel pipe with the epoxy anti-corrosion coating are each connected with a set of annular positioning hoops; the steel pipe with the epoxy anti-corrosion coating and the reinforced concrete pipe pile are coaxially arranged, the steel pipe with the epoxy anti-corrosion coating is located at the broken pile position of the reinforced concrete pipe pile, and the steel pipe with the epoxy anti-corrosion coating and the reinforced concrete pipe pile are locked through the two sets of annular positioning hoops. By adopting the steel pipe with the anti-corrosion coating, welding the shear nails in the steel pipe, pouring the ultra-high performance concrete UHPC and a corresponding construction method, by utilizing the characteristics of high flowability, high impermeability and early high strength of the ultra-high performance concrete UHPC and combining the interface strengthening effect of the shear nails, the pain point of the traditional technology is accurately solved, and the construction efficiency is improved. And a reliable scheme is provided for ocean engineering broken pile reinforcement.

Description

Technical Field

[0001] This invention relates to the field of pile foundation construction engineering technology, and in particular to a local reinforcement device for marine concrete piles and its construction method. Background Technology

[0002] In marine engineering fields such as port terminals, cross-sea bridges, offshore wind power, and photovoltaics, large-diameter concrete pipe piles are the core load-bearing structures, and their integrity directly determines the stability, safety, and service life of the project. As marine engineering expands into the deep sea, the dynamic loads such as surges and tides borne by the pipe piles become more complex. Hammering construction or long-term service can easily lead to pile cracking and breakage, and existing reinforcement technologies are difficult to adapt to the harsh working conditions.

[0003] Currently, the reinforcement of broken offshore pipe piles mostly adopts traditional steel pipe hoops, which involve methods such as no shear studs, ordinary concrete pouring, steel plate welding, or carbon fiber cloth bonding. These technologies have obvious limitations: traditional steel pipe hoops do not have shear studs, the interface bonding between ordinary concrete and steel pipe / original pile is weak, and delamination and sliding are prone to occur under stress, making it impossible to form a whole load-bearing system; the steel pipes are not treated with targeted anti-corrosion measures, and electrochemical corrosion is prone to occur in high salt spray environments, causing the reinforcement layer to crack and peel off in a short period of time; ordinary concrete has poor fluidity and low impermeability, is prone to segregation during underwater pouring, and has a long curing period, making it difficult to adapt to short offshore operation windows such as periods without wind and waves.

[0004] There is an urgent need in this field for a reinforcement solution that combines "corrosion resistance, strong synergy, and high adaptability": it must solve the problem of marine corrosion of steel pipes, strengthen the synergy between the reinforcement layer and the original pile, and be adaptable to rapid underwater and offshore construction. Summary of the Invention

[0005] The purpose of this invention is to provide a local reinforcement device for marine concrete piles and its construction method. By using a steel pipe with an anti-corrosion coating, welding shear studs inside the steel pipe, and employing ultra-high performance concrete (UHPC) grouting and a specialized fixing method, the invention utilizes the high fluidity, high impermeability, and early high strength characteristics of UHPC, combined with the interface strengthening effect of shear studs, to solve the pain points of traditional technologies and provide a reliable solution for the reinforcement of broken piles in marine engineering.

[0006] To achieve the above objectives, the present invention provides a partial reinforcement device for marine concrete piles, comprising a reinforced concrete pipe pile, a steel pipe with an epoxy anti-corrosion coating, and annular positioning clamps. A set of annular positioning clamps is connected to both the upper and lower ends of the outer wall of the epoxy anti-corrosion coated steel pipe. The epoxy anti-corrosion coated steel pipe is coaxially arranged with the reinforced concrete pipe pile, and is located at the break point of the reinforced concrete pipe pile. The two sets of annular positioning clamps lock the epoxy anti-corrosion coated steel pipe to the reinforced concrete pipe pile.

[0007] Preferably, the steel pipe with epoxy anti-corrosion coating is a hollow cylindrical shape, and the steel pipe with epoxy anti-corrosion coating has a two-part detachable structure. The two parts of the steel pipe with epoxy anti-corrosion coating are connected together by steel pipe locking bolts and nuts.

[0008] Preferably, the inner wall of the steel pipe with epoxy anti-corrosion coating is uniformly fixed with shear studs along the axial direction, and the shear studs are extended toward the center of the steel pipe with epoxy anti-corrosion coating to improve the shear bearing capacity.

[0009] Preferably, the top of the outer wall of the steel pipe with epoxy anti-corrosion coating is provided with a grouting hole, and the bottom of the outer wall of the steel pipe with epoxy anti-corrosion coating is provided with a venting hole, for underwater high-pressure injection of ultra-high performance concrete grout.

[0010] Preferably, the annular positioning clamp is a two-part detachable structure, and the two parts of the annular positioning clamp are connected together by clamp locking bolts and nuts.

[0011] Preferably, the inner ring of the annular positioning clamp is provided with an annular elastic guide block, the elastic guide block protruding towards the center of the annular positioning clamp, and the elastic guide block is in contact with the outer wall of the reinforced concrete pipe pile.

[0012] Preferably, the bottom of the annular positioning clamp is provided with an arc-shaped groove, which is engaged with the outer wall of the steel pipe with epoxy anti-corrosion coating to fix the steel pipe with epoxy anti-corrosion coating.

[0013] A construction method for a local reinforcement device for marine concrete piles includes the following steps: Step 1: Before installing the ring positioning clamp, carry out the preparatory work by checking whether the two-lobed ring positioning clamp, the steel pipe with epoxy anti-corrosion coating, and the bolt and nut assembly are complete. Step 2: Insert the two-lobed annular positioning clamp into the reinforced concrete pipe pile. With the help of the elastic guide block structure of the annular positioning clamp, make the centroid of the reinforced concrete pipe pile coaxial with the centroid of the annular positioning clamp. Step 3: Use clamp locking bolts and nuts to pre-tighten a two-lobed annular positioning clamp, so that the annular positioning clamp is initially tightly connected to the reinforced concrete pipe pile; Step 4: Place the steel pipe with epoxy anti-corrosion coating onto the broken pile, and make the groove of another annular positioning clamp engage with the outer wall of the steel pipe with epoxy anti-corrosion coating to achieve positioning constraint between the steel pipe with epoxy anti-corrosion coating and the broken pile. Then tighten the clamp locking bolts and nuts at the top of all the annular positioning clamps, and the steel pipe locking bolts and nuts of the steel pipe with epoxy anti-corrosion coating to achieve fixation. Step 5: Using a high-pressure water gun, inject underwater grouting material through the pre-drilled grouting hole at the top of the steel pipe to fill the gap between the epoxy-coated steel pipe and the broken pile, thus completing the overall reinforcement construction.

[0014] The advantages and positive effects of the local reinforcement device for marine concrete piles and its construction method described in this invention are as follows: 1. Existing technologies suffer from poor coordination between the steel pipe, concrete, and original pile due to the absence of shear studs and the use of ordinary concrete. This invention pre-welds shear studs onto the inner wall of the steel pipe, with the studs evenly distributed axially and circumferentially. Combined with the high adhesion of ultra-high performance concrete, the shear studs embed into the ultra-high performance concrete, forming a dual force transmission structure of "mechanical interlocking and interfacial bonding." Simultaneously, the ultra-high performance concrete fills the cracks in the original pile and the gap between the steel pipe and the original pile, achieving overall force distribution among the three components, preventing delamination and slippage, and significantly improving load-bearing capacity and fatigue resistance.

[0015] 2. Existing steel pipes lack corrosion protection, and ordinary concrete has poor impermeability, making them susceptible to seawater corrosion. The steel pipes of this invention are coated with an epoxy anti-corrosion coating before leaving the factory, isolating them from seawater contact; the ultra-high performance concrete has a chloride ion permeability resistance coefficient ≤1×10⁻⁶. -12 The flow rate is m / s, forming a dense protective layer that prevents seawater from seeping in and eroding the original pile. This dual anti-corrosion design solves the problem of insufficient durability in traditional technologies, increasing the service life of the reinforced structure by more than three times.

[0016] 3. Existing ordinary concrete has poor fluidity and a long curing time, making it unsuitable for offshore working conditions. The ultra-high performance concrete used in this invention has good fluidity and can be poured underwater by self-leveling without vibration; moreover, ultra-high performance concrete has high early strength, shortening the curing period to 1-2 days, making it suitable for short offshore working windows. At the same time, the elastic guide blocks on the inner wall of the steel pipe and the annular positioning clamps ensure that the steel pipe is coaxial with the original pile, unaffected by wind and waves, improving construction accuracy and efficiency.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a partial reinforcement device for marine concrete piles according to the present invention. Figure 2 This is a schematic diagram of the steel pipe with epoxy anti-corrosion coating according to the present invention; Figure 3 This is a schematic diagram of the half-body structure of the steel pipe with epoxy anti-corrosion coating of the present invention; Figure 4 This is a schematic diagram of the annular positioning clamp structure of the present invention; Figure 5 This is a schematic diagram of the half-body structure of the annular positioning clamp of the present invention. Attached Figure

[0019] 1. Reinforced concrete pipe piles; 2. Steel pipes with epoxy anti-corrosion coating; 3. Circular positioning clamps; 4. Clamp locking bolts and nuts; 5. Slots; 6. Elastic guide blocks; 7. Grouting holes; 8. Vent holes; 9. Steel pipe locking bolts and nuts; 10. Shear studs. Detailed Implementation

[0020] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0022] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] like Figures 1-5 As shown, a partial reinforcement device for marine concrete piles includes a reinforced concrete pipe pile 1, a steel pipe 2 with an epoxy anti-corrosion coating, and annular positioning clamps 3. The upper and lower ends of the outer wall of the steel pipe 2 with epoxy anti-corrosion coating are connected to a set of annular positioning clamps 3. The steel pipe 2 with epoxy anti-corrosion coating is coaxially arranged with the reinforced concrete pipe pile 1, and the steel pipe 2 with epoxy anti-corrosion coating is located at the broken pile position of the reinforced concrete pipe pile 1. The two sets of annular positioning clamps 3 lock the steel pipe 2 with epoxy anti-corrosion coating to the reinforced concrete pipe pile 1.

[0024] The steel pipe 2 with epoxy anti-corrosion coating is a hollow cylindrical shape. The steel pipe 2 with epoxy anti-corrosion coating has a two-part detachable structure. The two parts of the steel pipe 2 with epoxy anti-corrosion coating are connected together by steel pipe locking bolts and nuts 9.

[0025] Shear studs 10 are uniformly fixed along the axial direction on the inner wall of the steel pipe 2 with epoxy anti-corrosion coating. The shear studs 10 extend towards the center of the steel pipe 2 with epoxy anti-corrosion coating to improve the shear bearing capacity.

[0026] The top of the outer wall of the steel pipe 2 with epoxy anti-corrosion coating is provided with grouting hole 7, and the bottom of the outer wall of the steel pipe 2 with epoxy anti-corrosion coating is provided with vent hole 8, which is used for underwater high-pressure injection of ultra-high performance concrete grout.

[0027] Specifically, the concrete used is ultra-high performance concrete (UHPC).

[0028] The annular positioning clamp 3 is a two-part detachable structure, and the two parts of the annular positioning clamp 3 are connected together by clamp locking bolts and nuts 4.

[0029] The inner ring of the annular positioning clamp 3 is provided with an annular elastic guide block 6. The elastic guide block 6 protrudes towards the center of the annular positioning clamp 3 and is in contact with the outer wall of the reinforced concrete pipe pile 1.

[0030] The bottom of the annular positioning clamp 3 is provided with an arc-shaped groove 5, which is clamped on the outer wall of the steel pipe 2 with epoxy anti-corrosion coating to fix the steel pipe 2 with epoxy anti-corrosion coating.

[0031] This invention discloses a construction method for a local reinforcement device for marine concrete piles, comprising the following steps: Step 1: Before constructing the annular positioning clamp 3, carry out the preparatory procedures and check whether the two-lobed annular positioning clamp 3, the steel pipe 2 with epoxy anti-corrosion coating, and the bolt and nut assembly are complete.

[0032] Step 2: Fit the two-lobed annular positioning clamp 3 into the reinforced concrete pipe pile 1. With the help of the elastic guide block 6 structure of the annular positioning clamp 3, make the centroid of the reinforced concrete pipe pile 1 coaxial with the centroid of the annular positioning clamp 3.

[0033] Step 3: Use the clamp locking bolt and nut 4 to pre-tighten a two-lobed annular positioning clamp 3, so that the annular positioning clamp 3 is initially tightly connected to the reinforced concrete pipe pile 1.

[0034] Step 4: Place the epoxy-coated steel pipe 2 onto the broken pile, and engage the groove 5 of another annular positioning clamp 3 on the outer wall of the epoxy-coated steel pipe 2 to achieve positioning constraint between the epoxy-coated steel pipe 2 and the broken pile. Then tighten all the clamp locking bolts and nuts 4 at the top of the annular positioning clamps 3, and the steel pipe locking bolts and nuts 9 of the epoxy-coated steel pipe 2 to achieve fixation.

[0035] Step 5: Using a high-pressure water gun, inject underwater grouting material through the pre-reserved grouting hole 7 at the top of the steel pipe to fill the gap between the steel pipe 2 with epoxy anti-corrosion coating and the broken pile, thus completing the overall reinforcement construction.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the essence and scope of the technical solutions of the present invention.

Claims

1. A local reinforcement device for a marine concrete pile, characterized in that: The utility model provides a kind of steel pipe with epoxy anticorrosive coating and reinforced concrete pipe pile, the steel pipe with epoxy anticorrosive coating is coaxially arranged with reinforced concrete pipe pile, and the steel pipe with epoxy anticorrosive coating is located at the broken pile position of reinforced concrete pipe pile, and two sets of annular positioning clamps lock the steel pipe with epoxy anticorrosive coating and reinforced concrete pipe pile.

2. A local reinforcement device for a marine concrete pile according to claim 1, characterized in that: The steel pipe with epoxy anticorrosive coating is hollow cylindrical shape, and the steel pipe with epoxy anticorrosive coating is two-piece detachable structure, and the split structure of the steel pipe with epoxy anticorrosive coating is connected together by steel pipe locking bolt and nut.

3. A local reinforcement device for a marine concrete pile according to claim 2, characterized in that: The inner wall of the steel pipe with epoxy anticorrosive coating is uniformly fixed with shear stud along the axial direction, and the shear stud extends to the center of the steel pipe with epoxy anticorrosive coating to improve the shear bearing capacity.

4. A local reinforcement device for a marine concrete pile according to claim 3, characterized in that: The top of the outer wall of the steel pipe with epoxy anticorrosive coating is provided with a grouting hole, and the bottom of the outer wall of the steel pipe with epoxy anticorrosive coating is provided with an exhaust hole for underwater high-pressure pouring of super-high-performance concrete slurry.

5. A local reinforcement device for a marine concrete pile according to claim 4, characterized in that: The annular positioning clamp is two-piece detachable structure, and the split structure of the annular positioning clamp is connected together by clamp locking bolt and nut.

6. A local reinforcement device for a marine concrete pile according to claim 5, characterized in that: The inner ring of the annular positioning clamp is provided with annular elastic guide block, which protrudes towards the center of the annular positioning clamp, and the elastic guide block is attached to the outer wall of the reinforced concrete pipe pile.

7. A local reinforcement device for a marine concrete pile according to claim 6, characterized in that: The bottom of the annular positioning clamp is provided with an arc-shaped clamping groove, which is clamped on the outer wall of the steel pipe with epoxy anticorrosive coating to fix the steel pipe with epoxy anticorrosive coating.

8. A method of construction of a local reinforcement of a marine concrete pile according to any one of claims 1 to 7, characterized in that: The utility model includes the following steps, Step one: before the construction of the annular positioning clamp, the preparation process is carried out, and the completeness of the two-piece annular positioning clamp, the steel pipe with epoxy anticorrosive coating, the bolt and nut assembly fittings is checked; Step two: the two-piece annular positioning clamp is sleeved on the reinforced concrete pipe pile, and the centroid of the reinforced concrete pipe pile is coaxial with the centroid of the annular positioning clamp by means of the elastic guide block structure of the annular positioning clamp; Step three: the clamp locking bolt and nut are used to pre-tighten one two-piece annular positioning clamp, so that the annular positioning clamp is preliminarily tightly combined with the reinforced concrete pipe pile; Step four: the steel pipe with epoxy anticorrosive coating is sleeved on the broken pile, and the clamping groove of the other annular positioning clamp is clamped on the outer wall of the steel pipe with epoxy anticorrosive coating to realize the positioning and constraint of the steel pipe with epoxy anticorrosive coating and the broken pile, and then the clamp locking bolt and nut at the top of all annular positioning clamps, the steel pipe locking bolt and nut of the steel pipe with epoxy anticorrosive coating are tightened to realize fixation; Step five: underwater grouting material is poured into the gap between the steel pipe with epoxy anticorrosive coating and the broken pile through the grouting hole reserved at the top of the steel pipe by high-pressure water gun to complete the overall reinforcement construction.

Images