Steel pipe pile cofferdam anti-floating structure suitable for deepwater foundation and construction method

Abstract

The invention provides a deepwater foundation steel pipe pile cofferdam anti-floating structure which is characterized by comprising an anti-floating support, the anti-floating support comprises a plurality of anti-floating support vertical rods arranged on the periphery of a steel casing, the middles of the anti-floating support vertical rods are connected and fixed through a transverse connecting system, and the bottom of the anti-floating support is fixed through a bottom connecting system; the tops of the anti-floating supports are welded and fixed to the outer wall of the steel casing, the anti-floating support vertical rods are evenly distributed in the outer circumferential direction of the steel casing, and flitch plates are welded to the tops of the anti-floating supports and fixed to the outer wall of the steel casing at the same time. According to the steel pipe pile cofferdam anti-floating structure suitable for the deepwater foundation, the structural form is simple, operation is convenient, the stress form is clear, the bottom sealing concrete bears small buoyancy, and the safety problems that the cofferdam floats upwards, and a bearing platform inclines are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to an anti-floating structure of a steel pipe pile cofferdam suitable for a deep-water foundation and a construction method. Background Art

[0002] When the bridge cap and main tower are located below the water surface, a water-retaining cofferdam structure needs to be built. The cofferdam in the deepwater foundation will be subject to a large buoyancy, especially the large-size steel pipe pile cofferdam in the deepwater foundation. The buoyancy is resisted by the bonding force between the bottom concrete and the steel casing, the bottom concrete and the self-weight of the cofferdam. Especially when the size of the cofferdam in the deepwater foundation is large, a larger bottom concrete thickness is required to resist the huge buoyancy. The bonding force between the bottom concrete and the steel casing is not enough to resist the large buoyancy, which will cause the cofferdam to float up, the cap to tilt, and other problems, which will cause serious losses to the project. Therefore, it is necessary to develop an anti-floating structure and construction method for steel pipe pile cofferdams in deepwater foundations. Summary of the invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes an anti-floating structure and construction method suitable for deep-water foundation steel pipe pile cofferdam, so as to solve the problem that large steel pipe pile cofferdams in deep-water foundations are subjected to large buoyancy and high construction risks.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] The invention discloses an anti-floating structure suitable for a deep-water foundation steel pipe pile cofferdam, comprising an anti-floating support, wherein the anti-floating support comprises a plurality of anti-floating support uprights arranged on the periphery of a steel casing, wherein the middle of the anti-floating support uprights is connected and fixed by a transverse connecting system, the bottom of the anti-floating support is fixed by a bottom connecting system, and the top of the anti-floating support is welded and fixed to the outer wall of the steel casing.

[0006] Furthermore, the vertical poles of each anti-floating support are evenly distributed along the outer circumference of the steel casing.

[0007] Furthermore, a plate is welded on the top of the anti-floating support, and the plate is also fixed to the outer wall of the steel casing.

[0008] Furthermore, the top of the anti-floating support is welded to the portion of the steel casing above the water surface.

[0009] A construction method of the above anti-floating structure comprises the following steps:

[0010] S1. After the steel pipe pile cofferdam is driven and the inner support is lowered underwater, the mud inside the cofferdam is sucked;

[0011] S2. Install the anti-floating support and weld the top of the anti-floating support to the steel casing;

[0012] S3, pouring the bottom concrete underwater for the first time;

[0013] S4. After the bottom concrete to be poured reaches the designed strength, water is pumped out of the cofferdam and the inner support is tightened;

[0014] S5. Weld a corbel to the steel casing at the top of the poured bottom concrete; for example, the corbel is made of I-beam.

[0015] S6, pouring the bottom concrete for the second time;

[0016] S7. Cut off the steel casing and anti-floating support on the top of the bottom concrete to form a cofferdam and pour the foundation.

[0017] Furthermore, the top of the anti-floating support is welded to the portion of the steel casing above the water surface.

[0018] Furthermore, the top of the anti-floating support is welded to the steel casing through a plate.

[0019] Further, in step S6, the thickness of the poured concrete needs to be no less than the height of the corbel.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The invention provides an anti-floating structure suitable for deep-water foundation steel pipe pile cofferdams. The structure is simple, easy to operate, and has a clear force form, so that the bottom concrete is subjected to a smaller buoyancy, avoiding safety problems such as cofferdam floating and pedestal tilting. During construction, before water is pumped out of the cofferdam, the anti-floating brackets welded on the steel casing and the bottom concrete jointly resist the buoyancy; after water is pumped out of the cofferdam and the anti-floating brackets are cut off, the corbels welded on the steel casing and the bottom concrete jointly resist the buoyancy. This construction method is suitable for the construction of deep-water foundation steel pipe pile cofferdams. Compared with the traditional anti-floating method, when the thickness of the bottom concrete remains unchanged, the buoyancy of the bottom concrete is greatly reduced, avoiding the problem of cofferdam floating; when the force on the bottom concrete remains unchanged, the thickness of the bottom concrete is reduced, thereby reducing the amount of bottom concrete used. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0023] Figure 1 The invention is a schematic diagram of an anti-floating structure of a steel pipe pile cofferdam suitable for deep-water foundation;

[0024] Figure 2 for Figure 1 Schematic diagram of the cross section at AA in the middle;

[0025] Figure 3 for Figure 1 Schematic diagram of the cross section at BB;

[0026] Figure 4 for Figure 1 Schematic diagram of the cross section at CC;

[0027] Figure 5 This is a schematic diagram of the arrangement of the corbels in the invention;

[0028] Figure 6 for Figure 5 Schematic diagram of the cross section at AA in the middle. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0033] A kind of anti-floating structure suitable for deep-water foundation steel pipe pile cofferdam, such as Figures 1 to 6As shown, it includes an anti-floating support, which includes a plurality of anti-floating support poles 2 arranged on the periphery of a steel casing 1. The middle of the anti-floating support poles are connected and fixed by a transverse connecting system 4, the bottom of the anti-floating support is fixed by a bottom connecting system 5, and the top of the anti-floating support is welded and fixed to the outer wall of the steel casing.

[0034] The anti-floating support uprights are evenly distributed along the outer circumference of the steel casing.

[0035] A plate is welded on the top of the anti-floating support, and the plate is also fixed to the outer wall of the steel casing.

[0036] The top of the anti-floating support is welded to the part of the steel casing above the water surface.

[0037] A construction method for the above-mentioned anti-floating structure of steel pipe pile cofferdam applicable to deep-water foundation comprises the following steps:

[0038] S1. After the steel pipe pile cofferdam is driven and the inner support is lowered underwater, the mud inside the cofferdam is sucked;

[0039] S2. Install the anti-floating support and weld the top of the anti-floating support to the steel casing;

[0040] S3, pouring the bottom concrete underwater for the first time;

[0041] S4. After the bottom concrete to be poured reaches the designed strength, water is pumped out of the cofferdam and the inner support is tightened;

[0042] S5, welding a bracket 6 on the steel casing at the top of the poured bottom concrete;

[0043] S6, pouring the bottom concrete for the second time;

[0044] S7. Cut off the steel casing and anti-floating support on the top of the bottom concrete to form a cofferdam and pour the foundation.

[0045] In step S6, the thickness of the poured concrete needs to be no less than the height of the corbel. The anti-floating bracket and the corbel are welded to the steel casing, which has great rigidity and can transfer most of the buoyancy to the steel casing, thereby reducing the buoyancy of the bottom concrete and ensuring the safety of the steel cofferdam construction. The top of the anti-floating bracket is welded to the part of the steel casing above the water surface. The top of the anti-floating bracket is welded to the steel casing through a plate.

[0046] The invention provides an anti-floating structure suitable for deep-water foundation steel pipe pile cofferdams. The structure is simple, easy to operate, and has a clear force form, so that the bottom concrete is subjected to a smaller buoyancy, avoiding safety problems such as cofferdam floating and pedestal tilting. During construction, before water is pumped out of the cofferdam, the anti-floating brackets welded on the steel casing and the bottom concrete jointly resist the buoyancy; after water is pumped out of the cofferdam and the anti-floating brackets are cut off, the corbels welded on the steel casing and the bottom concrete jointly resist the buoyancy. This construction method is suitable for the construction of deep-water foundation steel pipe pile cofferdams. Compared with the traditional anti-floating method, when the thickness of the bottom concrete remains unchanged, the buoyancy of the bottom concrete is greatly reduced, avoiding the problem of cofferdam floating; when the force on the bottom concrete remains unchanged, the thickness of the bottom concrete is reduced, thereby reducing the amount of bottom concrete used.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-floating structure for steel pipe pile cofferdams suitable for deepwater foundations, characterized by: It includes an anti-floating support, which includes a plurality of anti-floating support poles arranged on the periphery of the steel casing, the middle of the anti-floating support poles are connected and fixed by a transverse connecting system, the bottom of the anti-floating support is fixed by a bottom connecting system, and the top of the anti-floating support is welded and fixed to the outer wall of the steel casing.

2. The anti-floating structure of steel pipe pile cofferdam applicable to deepwater foundation according to claim 1, characterized in that: The anti-floating support uprights are evenly distributed along the outer circumference of the steel casing.

3. The anti-floating structure and construction method of steel pipe pile cofferdam applicable to deepwater foundation according to claim 1, characterized in that: A plate is welded on the top of the anti-floating support, and the plate is also fixed to the outer wall of the steel casing.

4. The anti-floating structure and construction method of steel pipe pile cofferdam applicable to deepwater foundation according to claim 1, characterized in that: The top of the anti-floating support is welded to the part of the steel casing above the water surface.

5. A construction method for the anti-floating structure according to claim 1, characterized in that: The steps include: S1. After the steel pipe pile cofferdam is driven and the inner support is lowered underwater, the mud inside the cofferdam is sucked; S2. Install the anti-floating support and weld the top of the anti-floating support to the steel casing; S3, pouring the bottom concrete underwater for the first time; S4. After the bottom concrete to be poured reaches the designed strength, water is pumped out of the cofferdam and the inner support is tightened; S5. Weld the bracket on the steel casing at the top of the poured bottom concrete; S6, pouring the bottom concrete for the second time; S7. Cut off the steel casing and anti-floating support on the top of the bottom concrete to form a cofferdam and pour the foundation.

6. The anti-floating structure and construction method of steel pipe pile cofferdam applicable to deepwater foundation according to claim 5, characterized in that: The top of the anti-floating support is welded to the part of the steel casing above the water surface.

7. The anti-floating structure and construction method of steel pipe pile cofferdam applicable to deepwater foundation according to claim 5, characterized in that: The top of the anti-floating support is welded to the steel casing through a plate.

8. The anti-floating structure and construction method of steel pipe pile cofferdam applicable to deepwater foundation according to claim 5, characterized in that: In step S6, the thickness of the poured concrete needs to be no less than the height of the corbel.

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