Underwater steel structure pier column foot structure

Abstract

The utility model discloses an underwater steel structure pier column foot structure, relates to the field of pier structures, and aims to solve the problem of poor anti-corrosion capability of an underwater pier of a steel structure in a fresh water area at present, enveloping concrete is arranged outside the bottom of the steel structure pier, the enveloping concrete adopts reinforced concrete, and an internal steel bar part of the enveloping concrete is fixedly connected with the pier; and the connecting position of the top face of the encapsulation concrete and the pier is filled with sealant in advance, the top face of the encapsulation concrete is covered with the waterproof layer, accumulated water invading between the pier and the encapsulation concrete is reduced, and therefore the anti-corrosion capacity of the pier is improved, and the durability of the pier is improved.

Description

Technical Field

[0001] The utility model relates to the field of bridge pier structures, in particular to an underwater steel structure bridge pier column foot structure. Background Art

[0002] For steel bridges built in water bodies, some piers may be underwater. Steel piers are characterized by light structure, easy installation, and fast construction. They are also highly adaptable to piers with complex shapes. Therefore, they are widely used in pedestrian landscape bridges of general scale and rich pier shapes. However, the biggest disadvantage of steel piers in water is that they are easily corroded and have poor durability. Therefore, for steel piers in water, cathodic protection, anti-corrosion coatings, and concrete encapsulation of underwater steel columns are generally used to solve the anti-corrosion problem. The construction process of cathodic protection and anti-corrosion coatings is relatively complicated, and the construction requirements are extremely high. During the construction process, attention should be paid to the protection of anti-corrosion measures, and a thicker anti-corrosion coating is required to achieve a certain anti-corrosion effect. These two anti-corrosion methods are usually used in coastal environments with deep water depths such as ports and docks. For pedestrian landscape bridges in freshwater areas of general scale with small horizontal deformation of piers, the corrosion of steel is general due to the freshwater environment and the shallow water depth. Therefore, reinforced concrete encapsulation is usually used to prevent the corrosion of steel piers.

[0003] Common concrete encapsulation includes plain concrete encapsulation and reinforced concrete encapsulation. Plain concrete encapsulation is often used to encapsulate shorter steel columns. For steel columns with higher heights, reinforced concrete encapsulation is used to prevent the encapsulation concrete from cracking when the steel column deforms. Due to the inconsistency in linear stiffness between steel and concrete, when the steel column deforms, there will be an incoordination between the deformation of the steel column and the concrete encapsulation. As time goes by, there will be a gap between the two. This gap will cause rainwater to remain here, accelerating the corrosion of the steel column, resulting in the weakening of the anti-corrosion ability of the encapsulation concrete on the lifting steel column. Utility Model Content

[0004] The purpose of the utility model is to provide a steel structure pier column foot structure in water in view of the defects existing in the prior art, wherein encapsulated concrete is arranged outside the bottom of the steel structure pier, the encapsulated concrete adopts reinforced concrete, the internal steel bar part of which is fixedly connected with the pier, thereby increasing the deformation coordination of the encapsulated concrete and the pier, pre-filling the sealing glue at the junction of the top surface of the encapsulated concrete and the pier, and covering the top surface of the encapsulated concrete with a waterproof layer, thereby reducing the intrusion of accumulated water between the pier and the encapsulated concrete, thereby improving the durability of the pier.

[0005] In order to achieve the above purpose, the following technical solutions are adopted:

[0006] A submerged steel structure bridge pier column foot structure, comprising:

[0007] The pier foundation is embedded with anchor bolts, and the top ends of the anchor bolts extend outside the pier foundation.

[0008] The pier is made of steel structure, and a column base plate is provided at the bottom end. The anchor bolts are connected to the column base plate through fasteners.

[0009] The enclosed concrete is located on the pier foundation and covers the outside of the column base plate of the pier. A steel bar framework is arranged inside the enclosed concrete, and the steel bar framework is connected to the outer peripheral surface of the pier. Sealing grooves distributed along the perimeter of the pier are formed on the top surface of the enclosed concrete, and flexible caulking sealant is filled in the sealing grooves. A waterproof layer is painted on the top surface of the enclosed concrete, and the waterproof layer extends to the outer peripheral surface of the pier.

[0010] Furthermore, a column base plate is embedded in the pier foundation, and a plurality of column base holes for the anchor bolts to pass through are formed on the column base plate.

[0011] Furthermore, the column base holes correspond to the anchor bolts one by one. One end of the anchor bolt is embedded in the pier foundation, and the other end extends outside the pier foundation after passing through the column base holes.

[0012] Furthermore, a threaded section is provided on the part of the anchor bolt outside the pier foundation, and the fastener is matched with the threaded section and abuts against the column base plate.

[0013] Furthermore, stiffening ribs are connected between the column base plate and the pier, and a plurality of stiffening ribs are spaced along the perimeter of the pier.

[0014] Furthermore, the fastener is located between two adjacent stiffening ribs. The enclosed concrete wraps the outside of the stiffening ribs and the column base plate and extends above the stiffening ribs.

[0015] Furthermore, the top surface of the enclosed concrete forms an inclined slope, and the height of the top surface of the enclosed concrete gradually decreases in the direction away from the axis along the radial direction of the pier.

[0016] Furthermore, the steel bar framework includes stirrups and vertical bars. A plurality of layers of stirrups are arranged along the axial direction of the pier, and a plurality of vertical bars are arranged at intervals along the perimeter of the pier. The stirrups and the vertical bars are connected to form a steel bar mesh.

[0017] Furthermore, the top surface of the enclosed concrete is above the ground line.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model aims at the problem that the anti-corrosion ability of the bottom of a steel structure pier in a fresh water area is poor at present. A wrapped concrete is arranged outside the bottom of the steel structure pier. The wrapped concrete is reinforced concrete, and part of the internal steel bars thereof is fixedly connected with the pier, so as to increase the deformation coordination of the wrapped concrete and the pier. A sealant is pre-filled at the joint position between the top surface of the wrapped concrete and the pier, and a waterproof layer is covered on the top surface of the wrapped concrete, so as to reduce the intrusion of accumulated water between the pier and the wrapped concrete, thereby improving the anti-corrosion ability of the pier and enhancing the durability of the pier.

[0020] In the utility model, a plurality of stiffening ribs are connected between the pier and the column base plate, which can improve the stability of the pier body.

[0021] In the utility model, a flexible caulking sealant is filled in a groove on the top surface of the wrapped concrete. The flexible caulking sealant can have a certain deformation space by itself, can change along with the change of the gap between the pier and the wrapped concrete, and will not be damaged by itself; secondly, a caulking material is adopted, one side of which can be closely connected with the edge of the pier, and the other side of which can be firmly bonded with the edge of the wrapped concrete, so as to reduce the occurrence of cracks. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the column base structure of a steel structure pier in water in an embodiment of the utility model.

[0023] Figure 2 It is a schematic diagram of the wrapped concrete in an embodiment of the utility model.

[0024] Figure 3 It is a schematic diagram of the waterproof structure at the top of the wrapped concrete in an embodiment of the utility model.

[0025] Label description (in the order of the first appearance): 1. Pier, 2. Stiffening rib, 3. Wrapped concrete, 4. Sealant, 5. Fastener, 6. Column base plate, 7. Anchor bolt, 8. Pier foundation, 9. Column foot plate, 10. Waterproof layer, 11. Stirrup, 12. Vertical bar. Detailed Embodiment

[0026] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application.

[0027] As Figures 1 - 3 shown, this embodiment provides a column base structure of a steel structure pier in water, aiming at enhancing the structural stability and durability of the pier 1 in a complex underwater environment.

[0028] A steel structure pier column foot structure in water mainly includes a pier foundation 8, a pier 1, and enclosed concrete 3. Among them, the pier foundation 8 serves as the support foundation for the entire structure and is embedded with anchor bolts 7. The anchor bolts 7 ensure that the pier 1 can be firmly fixed on the pier foundation 8, and at the same time, their tops extend outside the pier foundation 8 for easy connection with the column base plate 6 of the pier 1. The pier 1 is made of steel structure and has sufficient strength and stiffness to bear the load of the bridge. The bottom end of the pier 1 is provided with a column base plate 6, which, as a key connecting component, is tightly connected to the anchor bolts 7 through fasteners 5, realizing the stable connection between the pier 1 and the pier foundation 8.

[0029] The enclosed concrete 3 is located on the pier foundation 8 and completely covers the column base plate 6 of the pier 1. It not only enhances the corrosion resistance of the bottom of the pier 1 but also improves the deformation coordination between the enclosed concrete 3 and the pier 1 through the connection between the internal steel bar framework and the outer peripheral surface of the pier 1, reducing the relative displacement caused by factors such as pier stress and temperature changes.

[0030] As Figure 2 shown, the steel bar framework arranged inside the enclosed concrete 3 is reinforced according to engineering requirements to ensure that it can effectively improve the deformation and crack resistance performance of the enclosed concrete when the pier deforms. As Figure 3 shown, the sealing grooves opened at the top of the enclosed concrete 3 are distributed along the periphery of the pier 1 and are filled with flexible caulking sealant 4, effectively preventing water from seeping into the tiny gaps between the enclosed concrete 3 and the pier 1, preventing the corrosion of the internal steel bars and the erosion of the concrete. The waterproof layer 10 is directly painted on the top surface of the enclosed concrete 3 and extends to the outer peripheral surface of the pier 1, forming a complete waterproof barrier. The material of the waterproof layer 10 needs to have good weather resistance and anti-aging performance to ensure long-term effective waterproof effect.

[0031] Through the design of the enclosed concrete 3 and the internal steel bar framework. The connection between the steel bar framework and the outer peripheral surface of the pier 1 enables the enclosed concrete 3 and the pier 1 to maintain good coordination during deformation, reducing the stress concentration and damage caused by inconsistent deformation, thereby reducing the occurrence of cracks.

[0032] The flexible caulking sealant 4 in the sealing grooves and the waterproof layer 10 on the top surface together constitute multiple waterproof barriers, effectively preventing water from invading the inside of the pier 1, reducing the risk of steel bar corrosion and concrete erosion, and extending the service life of the structure. This structural design is reasonable, the construction is simple, facilitating on-site operation and quality control. At the same time, the connection between each component is tight and reliable, easy to maintain and repair, and applicable to various complex underwater environments, such as engineering projects with high requirements for the service life and durability of bridges, such as important transportation arteries, urban landmark buildings, etc.

[0033] The pier foundation 8, as a key part supporting the entire pier 1, is internally designed with embedded anchor bolts 7 to ensure a firm connection with the pier 1. The column base plate 9 is buried inside the pier foundation 8, and multiple column base holes opened thereon precisely correspond to the positions of the anchor bolts 7. This ensures that the anchor bolts 7 can accurately pass through the column base plate 9, providing a strong anchoring force for the pier 1.

[0034] A concrete cushion layer can be provided between the column base plate 9 and the column base bottom plate 6, or the column base plate 9 and the column base bottom plate 6 can be directly abutted.

[0035] One end of the anchor bolt 7 is firmly buried in the pier foundation 8, and the other end has a threaded section and extends outside the pier foundation 8 through the column base hole. The threaded section facilitates the cooperation with the fastener 5 to achieve the fastening connection between the pier 1 and the foundation. The fastener 5 can cooperate with the threaded section of the anchor bolt 7. The fastener 5 can adopt multiple fastening nuts, which are abutted against the column base bottom plate 6 through tightening operations, locking the pier 1 firmly on the pier foundation 8. The position of the fastener 5 is usually arranged between two adjacent stiffening ribs 2, which facilitates the tightening operation, while optimizing the structural strength and stability.

[0036] The pier 1 is made of steel structure, which is a steel column structure. The bottom of the pier 1 is provided with a column base bottom plate 6 for connection with the anchor bolt 7. To improve the stability of the pier 1, multiple stiffening ribs 2 are connected between the pier 1 and the column base bottom plate 6. These stiffening ribs 2 are distributed at intervals along the periphery of the pier 1, effectively enhancing the stability of the pier 1.

[0037] The enclosed concrete 3 adopts a reinforced concrete structure, and a steel bar framework is provided inside to enhance its strength and toughness. The top surface is designed with an inclined slope, which helps with drainage and reduces the erosion of the accumulated water on the pier 1. Specifically, the top surface of the enclosed concrete 3 forms an inclined slope, and the height of the top surface of the enclosed concrete 3 gradually decreases along the direction radially away from the axis of the pier 1, that is, it forms a form with a lower outer circle and a higher center.

[0038] The steel bar framework is constructed by multiple layers of stirrups 11 and vertically arranged steel bars 12 distributed at intervals. The two are arranged in a mesh pattern, which not only improves the strength of the enclosed concrete 3, making the enclosed concrete not easily damaged when the pier 1 deforms; but also enhances the crack resistance of the enclosed concrete 3, reduces the generation of cracks, thereby extending the service life of the enclosed concrete 3, effectively resisting environmental erosion, and significantly improving its anti-corrosion performance.

[0039] In addition, the enclosed concrete 3 can use low-shrinkage and low-permeability cement, and add appropriate amounts of mineral admixtures and high-performance admixtures, which can improve the compactness, strength and durability of the enclosed concrete 3, thereby effectively resisting environmental erosion.

[0040] At the position where the top surface of the encapsulated concrete 3 is connected to the bridge pier 1, a sealing groove is pre-opened and filled with a flexible caulking sealant 4. The flexible caulking sealant 4 has good deformation ability and bonding performance, can adjust its own shape with the slight changes between the bridge pier 1 and the encapsulated concrete 3, can adapt to the slight deformation between the bridge pier 1 and the encapsulated concrete 3, and ensures the sealing effect. At the same time, the top surface of the encapsulated concrete 3 is also covered with a waterproof layer 10 to further prevent water intrusion.

[0041] The waterproof layer 10 is applied to the top surface of the encapsulated concrete 3 and the outer peripheral surface of the bridge pier 1 to form a continuous waterproof barrier. It can be understood that the material selection needs to consider weather resistance, anti-aging property and good bonding performance. The inclined design of the top surface of the encapsulated concrete 3 helps natural drainage and reduces the risk of water accumulation eroding the structure.

[0042] The top of the encapsulated concrete 3 is higher than the water level of the surrounding normal water level, preventing water or rainwater below the normal water level from seeping into the interior of the encapsulated concrete 3 and affecting the durability of the bridge pier 1; keeping the drainage around the bridge pier 1 unobstructed to avoid adverse effects on the bridge pier 1 caused by water accumulation; facilitating the daily maintenance and inspection of the bridge pier 1 to ensure the safe operation of the structure.

[0043] The specific embodiments of the utility model have been described in detail above, but they are only examples, and the utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modification or substitution to the utility model is also within the scope of the utility model. Therefore, any equivalent transformation, modification, improvement, etc. made without departing from the spirit and principle of the utility model should be covered within the scope of the utility model.

Claims

1. A steel structure pier column foot structure in water, characterized in that, Including: A pier foundation is embedded with anchor bolts, and the top ends of the anchor bolts extend outside the pier foundation; The pier is made of steel structure, and a column base plate is provided at the bottom end. The anchor bolts are connected to the column base plate through fasteners; The encased concrete is located on the pier foundation and wraps outside the column base plate of the pier. A steel bar framework is arranged inside the encased concrete, and the steel bar framework is connected to the outer peripheral surface of the pier; a sealing groove distributed along the periphery of the pier is formed on the top surface of the encased concrete, a flexible caulking sealant is filled in the sealing groove, and a waterproof layer is painted on the top surface of the encased concrete and extends to the outer peripheral surface of the pier.

2. The underwater steel structure pier column foot structure according to claim 1, characterized in that, A column base plate is embedded in the pier foundation, and a plurality of column base holes for the anchor bolts to pass through are formed on the column base plate.

3. The underwater steel structure pier column base structure according to claim 2, characterized in that, The column base holes correspond to the anchor bolts one by one. One end of the anchor bolt is embedded in the pier foundation, and the other end extends outside the pier foundation after passing through the column base hole.

4. The underwater steel structure pier column footing structure according to claim 1 or 2 or 3, characterized in that, A threaded section is provided on the part of the anchor bolt outside the pier foundation, and the fastener is matched with the threaded section and abuts against the column base plate.

5. The underwater steel structure pier column foot structure according to claim 1, characterized in that, Stiffening ribs are connected between the column base plate and the pier, and a plurality of stiffening ribs are distributed at intervals along the periphery of the pier.

6. The underwater steel structure pier column foot structure according to claim 5, characterized in that, The fastener is located between two adjacent stiffening ribs. The encased concrete wraps outside the stiffening ribs and the column base plate and extends above the stiffening ribs.

7. The underwater steel structure pier column footing structure according to claim 1, characterized in that, The top surface of the encased concrete forms an inclined slope, and the height of the top surface of the encased concrete gradually decreases in the direction away from the axis along the radial direction of the pier.

8. The underwater steel structure pier column footing structure according to claim 1, characterized in that The steel bar framework includes stirrups and vertical bars. A plurality of layers of stirrups are arranged along the axial direction of the pier, and a plurality of vertical bars are arranged at intervals along the periphery of the pier. The stirrups are connected to the vertical bars to form a steel bar mesh.

9. The underwater steel structure pier column foot structure according to claim 1, characterized in that, The top surface of the encased concrete is above the normal water level line.

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