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Method for repairing and reinforcing pile foundations in ocean splash zones

A technology of splash zone and pile foundation, which is applied in foundation structure engineering, sheet pile walls, buildings, etc., can solve the problems of weakening the durability of concrete, reducing the normal service life, and cracking of piles, and achieves significant economic benefits and low operating costs Considerable, life-prolonging effect

Inactive Publication Date: 2012-02-01
浙江固邦新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these measures are also short-term or medium-term maintenance solutions, and cannot guarantee the durability of the terminal structure during the entire operation period
[0004] In contrast, large pipe piles and PHC piles have the characteristics of high durability and good impermeability, but their flexural bearing capacity is much lower than that of steel pipe piles, the slope of pile sinking is small, and in the case of large number of strikes Under the condition of the pile, it is easy to crack the pile body and the pile top is damaged.
Secondly, passing ships under some bridges may rub against the side wall of the pile body, and its weak impact performance may cause concrete cracking or even partial layer detachment
These conditions will greatly weaken the durability of concrete and reduce its normal service life. Some necessary repairs must be carried out to meet the durability requirements

Method used

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  • Method for repairing and reinforcing pile foundations in ocean splash zones
  • Method for repairing and reinforcing pile foundations in ocean splash zones
  • Method for repairing and reinforcing pile foundations in ocean splash zones

Examples

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Embodiment 1

[0029] Example 1, reinforcement and repair of the splash area of ​​steel pipe piles at the wharf, refer to figure 1 , 2 , 3.

[0030] According to the actual corrosion situation, the splash area and the area below 1 m are designated as the repair area. The total repair height is 3 m, the repair thickness t is 70 mm, and r is the outer diameter of the pipe pile. The specific parameters of steel pipe piles are 1200 mm in diameter, 20 mm in wall thickness, and Q345 steel. The specific implementation steps are as follows:

[0031] (1) First, sandblast large areas of anti-corrosion parts with quartz sand to remove surface rust spots, and further use manual derusting for other severely corroded parts, or knock off floating rust with a hammer. Use a steel shovel to remove floating rust bumps and attached sea organisms (sea oysters, etc.), and use a steel brush and coarse sandpaper to remove attached seaweed, etc.

[0032] (2) The shear connectors are arranged at a certain distanc...

Embodiment 2

[0038] Example 2, reinforcement and repair of splash area of ​​wharf concrete pile, refer to Figure 4 .

[0039] According to the actual corrosion situation, the splash area and the area below 1 m are designated as the repair area, the total repair height is 3 m, and the repair thickness t is 70 mm. The specific implementation steps are as follows:

[0040] (1) Firstly, remove the loose concrete in the local severely corroded part, and then perform a hair removal treatment on the entire repaired area to remove the surface laitance, expose a fresh interface, and make the surface uneven, with a hair removal depth of 3 to 5 about mm.

[0041] (2) If the thickness of the repair exceeds 50 mm, an additional shear connector 5 is required to ensure reliable bonding between the newly poured UHTCC and the original concrete. In this embodiment, the shear connector 5 is provided.

[0042] Arrange the L-shaped anchor bar shear connectors 5 with a diameter of 8 mm, and set the connecto...

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Abstract

The invention provides a method for repairing and reinforcing pile foundations in ocean splash zones. The method is characterized by comprising the following steps: firstly carrying out interface treatment on the splash zones and the zones needing repair near the splash zones aiming at different pile body types, fixing end hoops for bearing upper construction loads on the lower edges of the repaired zone, installing external molds and then continuously pouring a self-compaction ultra high toughness cementitious composite (UHTCC). The method has the following beneficial effect: erosion of dry-wet alternation and chloride ion permeation in the splash zones, temperature difference and sea wave impact effect can be effectively resisted, thus ensuring the durability of pile bodies under the environmental condition of severe corrosion.

Description

technical field [0001] The invention belongs to the technical field of port engineering and bridge engineering, and relates to a reinforcement and repair technology for pile foundations of wharfs and bridges in marine environments, in particular to a method for repairing and strengthening piles in severely corroded ocean splash zones and tidal range zones. Background technique [0002] The structure of seaport engineering is in a highly corrosive marine environment, especially the structural part of the splash zone is in an extremely harsh environment of chloride ion erosion, and there are generally serious durability problems, and the corrosion of steel bars caused by chloride salts is the main problem facing port engineering at present. . In the high-piled wharf and sea-crossing bridge structure, the safety and reliability of the pile foundation is particularly important. In the splash area above the high tide level, the pile body is subjected to the impact of tides and w...

Claims

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Application Information

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IPC IPC(8): E02D5/64C04B28/00
Inventor 徐世烺侯利军李庆华
Owner 浙江固邦新材料有限公司
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