Steel cofferdam lock buckle gap water flushing device

Abstract

This utility model relates to the field of steel cofferdam technology, and discloses a water flushing device for the interlocking gaps of a steel cofferdam. It includes steel pipe retaining piles, with an interlocking structure on the outer side of each pile. A seamless steel pipe is also installed on the outer side of the retaining pile, positioned on one side of the interlocking structure. Water jets are provided on the seamless steel pipe, facing the interlocking structure. Compared with existing technologies, this utility model, by installing a seamless steel pipe at the root of the interlocking structure on the outer side of the steel pipe retaining pile, and connecting the seamless steel pipe to a high-pressure water pump, allows water to flush the interlocking area, jetting the blocked soil layer, reducing frictional resistance at the interlocking structure, minimizing stress deformation of the interlocking structure, and ensuring the overall water-stopping effect of the cofferdam. This utility model, when used in conjunction with a water jet drilling system, reduces pile driving (extraction) resistance and improves the accuracy of vibratory driving (extraction) of steel pipe piles.

Description

Technical Field

[0001] This utility model relates to the field of steel cofferdam construction technology, and in particular to a water flushing device for the locking gap of a steel cofferdam. Background Technology

[0002] Steel cofferdams are a commonly used retaining structure in the construction of deep-water bridge foundations. A steel cofferdam typically consists of a cofferdam wall, walers, internal supports, and a bottom sealing concrete layer, forming a water-tight and support structure during foundation construction, ensuring a dry construction environment. Steel cofferdams are mainly composed of multiple steel pipe columns arranged sequentially, with adjacent columns connected by an interlocking structure. During construction, water jet injection devices are often used. High-pressure water pumps pressurize water to hundreds of megapascals, creating a high-speed water jet through specially designed nozzles. This jet impacts the soil layer at the pile tip, pre-cutting and breaking up the soil, reducing pile driving (extraction) resistance, and improving the accuracy of vibratory driving (extraction) of the steel pipe piles. However, during construction, the interlocking structure on the outer side of the steel pipe pile is affected by soil conditions, resulting in significant side friction. During vibratory driving (extraction), this side friction can cause the interlocking to deform or even detach, affecting the subsequent water-stopping effect. Existing solutions include: First, applying lubricant to the locking mechanism to reduce friction. However, this lubricant will eventually become ineffective, failing to guarantee reduced friction during vibratory removal and potentially causing the locking mechanism to detach, impacting turnover. Furthermore, the use of lubricant can cause pollution. Second, changing the locking mechanism design. Simpler locking mechanisms result in reduced clamping force and poor water-stopping effect; more complex mechanisms with better water-stopping effects increase construction costs. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a water flushing device for the interlocking gaps of a steel cofferdam. A seamless steel pipe is installed at the root of the interlocking structure on the outside of the steel pipe retaining pile. This seamless steel pipe is connected to a high-pressure water pump, and spray holes are opened along the seamless steel pipe. This allows water to flush the interlocking position, jetting the blocked soil layer, reducing frictional resistance at the interlocking structure, minimizing stress and deformation of the interlocking structure, and ensuring the overall water-stopping effect of the cofferdam.

[0004] To achieve this technical objective, the present invention adopts the following solution:

[0005] This utility model provides a water flushing device for the interlocking gap of a steel cofferdam, including a steel pipe retaining pile, a locking structure is provided on the outside of the steel pipe retaining pile, and a seamless steel pipe is also provided on the outside of the steel pipe retaining pile. The seamless steel pipe is located on one side of the locking structure and has water spray holes.

[0006] Furthermore, the water spray holes are oriented towards the locking structure.

[0007] Furthermore, the seamless steel pipe is connected to the high-pressure water pump.

[0008] Furthermore, the locking structure is a CO type lock, a CT type lock, or a Larsen lock.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] This utility model provides a water flushing device for the interlocking gaps of a steel cofferdam. A seamless steel pipe is installed at the root of the interlocking structure on the outside of the steel pipe retaining pile. The seamless steel pipe is connected to a high-pressure water pump. Water spray holes are opened along the seamless steel pipe so that the water can flush the interlocking position, jet the blocked soil layer, reduce the frictional resistance at the interlocking structure, reduce the stress deformation of the interlocking structure, and ensure the overall water-stopping effect of the cofferdam. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the steel cofferdam structure in an embodiment of this utility model;

[0012] Figure 2 This is a top view of the steel pipe retaining pile in an embodiment of this utility model;

[0013] Figure 3 This is a side view of the steel pipe retaining pile in an embodiment of this utility model;

[0014] The markings in the diagram are: 1. Steel pipe retaining pile; 2. Interlocking structure; 3. Seamless steel pipe; 4. Water spray hole. Detailed Implementation

[0015] To fully understand the purpose, features and effects of this utility model, the following specific embodiments will be used to describe this utility model in detail, but this utility model is not limited thereto.

[0016] See Figures 1 to 3This utility model provides a water flushing device for the interlocking gaps of a steel cofferdam, including steel pipe retaining piles 1. The steel pipe retaining piles 1 are existing technology and will not be described in detail here. An interlocking structure 2 is provided on the outer side of the steel pipe retaining piles 1, and the interlocking structure 2 is welded to the steel pipe retaining piles 1. The interlocking structure 2 is a CO-type interlocking structure, a CT-type interlocking structure, or a Larssen interlocking structure, which can be determined according to the application scenario. Multiple steel pipe retaining piles 1 are arranged according to design requirements and connected by the interlocking structure 2 to form a steel cofferdam. A seamless steel pipe 3 is also provided on the outer side of the steel pipe retaining piles 1, and is welded to the steel pipe retaining piles 1. The seamless steel pipe 3 is connected to a high-pressure water pump and is located on one side of the interlocking structure 2. Water spray holes 4 are provided on the seamless steel pipe 3, facing the interlocking structure 2. The upper end of the seamless steel pipe 3 is connected to the high-pressure water pump, and high-pressure water enters the seamless steel pipe 3 and is sprayed onto the interlocking structure 2 through the water spray holes 4. A high-pressure water pump can be connected to multiple seamless steel pipes 3 simultaneously, or it can be connected to a single seamless steel pipe 3, depending on the application. The high-pressure water pump connected to the seamless steel pipe 3 can be shared with the high-pressure water pump of the water jet inlet system, or it can be separate, depending on the specific application scenario.

[0017] In this embodiment, the locking structure 2 is a Larssen lock, and the seamless steel pipe 3 is set at the root of the Larssen lock. The water jet hole 4 faces the opening of the Larssen lock. During construction, the water channel can flush the location of the locking structure 2, jetting the blocking soil layer, reducing the frictional resistance at the locking structure 2, reducing the stress deformation of the locking structure 2, preventing the locking structure 2 from detaching from the weld, and ensuring the overall water-stopping effect of the cofferdam. The high-pressure water pump connected to the seamless steel pipe 3 is shared with the water jet hole-preparing system. This utility model, when used in conjunction with the water jet hole-preparing system, reduces the resistance of pile driving (extraction) and improves the vibration driving (extraction) accuracy of steel pipe piles.

[0018] This utility model of a steel cofferdam interlocking gap water flushing device can, during construction, adjust parameters such as water pressure, water volume, and spray angle by making targeted openings based on the parameters of unfavorable soil layers such as silt and silty clay, according to the preliminary geological exploration report, thereby reducing energy consumption; compared with lubricants, it does not pollute the environment.

[0019] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of the present invention. Of course, those skilled in the art can make modifications and variations to the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should be considered as being within the protection scope of the present invention.

Claims

1. A water flushing device for the interlocking gap of a steel cofferdam, comprising steel pipe retaining piles (1), wherein an interlocking structure (2) is provided on the outer side of the steel pipe retaining piles (1), characterized in that, The locking structure (2) is a Larsen lock. A seamless steel pipe (3) is installed on the outside of the steel pipe retaining pile (1). The seamless steel pipe (3) is installed at the root of the locking structure (2). The seamless steel pipe (3) is connected to a high-pressure water pump. A water spray hole (4) is installed on the seamless steel pipe (3). The water spray hole (4) faces the opening of the Larsen lock.

Images