Deep-water, high-velocity, shallow-overburden composite reinforced double-walled steel cofferdam and construction method

Abstract

The present invention provides a double-walled steel casing cofferdam with a deep-water, high-flow rate, and shallow-cover layer combination reinforcement and a construction method, which mainly includes a double-walled steel casing cofferdam, a cofferdam reinforcement steel casing, sand filling treatment, a water-facing cofferdam, a cofferdam reinforcement bracket, a steel casing reinforcement bracket, a steel casing stabilizing steel pipe column, and a steel casing. In the construction of a double-walled steel casing cofferdam with a deep-water, high-flow rate, and shallow-cover layer combination reinforcement, the cofferdam reinforcement steel casing and the cofferdam reinforcement bracket are used to reinforce the water-facing cofferdam to improve the overall stability of the cofferdam. Sand filling treatment and steel casing reinforcement brackets are used inside the cofferdam reinforcement steel casing to improve its own stability. Steel casing stabilizing steel pipe columns are used to connect the cofferdam reinforcement steel casings. The present invention belongs to the field of civil engineering. The construction method for a double-walled steel casing cofferdam with a deep-water, high-flow rate, and shallow-cover layer combination reinforcement effectively reduces project costs, speeds up construction speed, and can achieve good technical and economic benefits when applied to actual projects.

Description

Technical Field

[0001] This invention relates to the field of civil engineering, and in particular to a double-walled steel cofferdam reinforced with a combination of deep-water, high-velocity, and shallow overburden layers, and its construction method. Background Technology

[0002] With the continuous advancement of transportation infrastructure construction, an increasing number of bridges need to be built in harsh aquatic environments. Deep water environments significantly increase the water pressure on cofferdams, dramatically increasing construction difficulty and risk. High flow velocities not only exert strong scouring forces on the cofferdam structure but also affect the stability of various materials and equipment during construction. Furthermore, shallow overburden layers cannot provide sufficient anchoring force for the cofferdam, making stable placement difficult. Against this backdrop, traditional single-wall steel cofferdams and earthen cofferdams are insufficient to meet construction requirements, easily leading to deformation, collapse, and other safety accidents, severely impacting project progress and quality. Therefore, developing a cofferdam construction technology suitable for deep-water, high-velocity, shallow-overburden layers is urgently needed to solve the challenges of bridge foundation construction under complex aquatic conditions and ensure the smooth progress of projects.

[0003] Conventional cofferdam construction suffers from problems such as poor overall stability of the cofferdam, low efficiency in connecting and positioning steel casings, and low efficiency in treating the cutting edge of the cofferdam. Summary of the Invention

[0004] The purpose of this invention is to provide a method for constructing a deep-water, high-velocity, shallow-cover layer reinforced double-walled steel cofferdam and its construction, which solves the above-mentioned technical problems.

[0005] To address the aforementioned technical problems, this invention provides a construction method for a double-walled steel cofferdam reinforced with a combination of deep-water, high-velocity, and shallow overburden layers, comprising the following steps:

[0006] Step 1, Steel casing construction: The steel casing is installed and positioned using a steel casing guide and stabilizing device. During the connection of the upper and lower steel casings, internal guide steel plates and steel clamps are used for connection.

[0007] Step 2: Reinforcement of the cofferdam with steel casing: Install steel casing reinforcement supports inside the steel casing and fill it with sand;

[0008] Step 3: Cofferdam sinking: Carry out the sinking construction of the double-walled steel caisson cofferdam. After the double-walled steel caisson cofferdam is sinking, use cofferdam reinforcement steel casing and cofferdam reinforcement support to reinforce the water-facing side of the cofferdam.

[0009] Step 4: Treatment of the cutting edge of the cofferdam: The cutting edge of the lower part of the double-walled steel cofferdam is adjusted and fixed using adjustable elevation steel supports;

[0010] Step 5: Pouring the bottom sealing concrete: The bottom sealing concrete of the cofferdam is poured. The steel casing and the double-walled steel caisson cofferdam are anchored to the bottom sealing concrete by the steel casing anchor plate and the cofferdam anchor plate, respectively.

[0011] The beneficial effects of this invention are as follows:

[0012] (1) The steel casing of the cofferdam is reinforced by using a cofferdam reinforcement support and sand filling treatment to improve the stability of the steel casing of the cofferdam on the water-facing side.

[0013] (2) A steel casing guide and stabilizing device is used to guide and position the steel casing, and internal guide steel plates and steel clamps are used to connect the steel casing, thereby improving the construction efficiency of the steel casing.

[0014] (3) An adjustable elevation steel support structure is used to support the cutting edge of the cofferdam, thereby improving the construction efficiency of the cutting edge treatment. Attached Figure Description

[0015] Figure 1 This is a structural diagram of a double-walled steel-casing cofferdam reinforced with a combination of deep-water, high-velocity, and shallow-cover layers.

[0016] Figure 2 This is a cross-sectional view of a double-walled steel-casing cofferdam;

[0017] Figure 3 This is a structural diagram of the steel casing guide and stabilization device;

[0018] Figure 4 This is a diagram of the steel casing connection structure;

[0019] Figure 5 This is a structural diagram of the cofferdam cutting edge treatment.

[0020] In the diagram: 1. Double-walled steel cofferdam; 2. Cofferdam reinforcement steel casing; 3. Sand filling treatment; 4. Water-facing cofferdam; 5. Cofferdam reinforcement support; 6. Steel casing reinforcement support; 7. Steel casing stabilizing steel pipe column; 8. Steel casing; 9. Reinforcement support beam; 10. Reinforcement support column; 11. Bottom sealing concrete; 12. Steel casing anchoring wing plate; 13. Cofferdam anchoring wing plate; 14. Steel casing guiding and stabilizing device; 15. Jack; 16. Guide beam; 17. Jack support platform; 18. Guide support beam; 9. Steel casing fixing bracket; 20. Upper steel casing; 21. Internal guide steel plate; 22. Fixing bolt; 23. Hoop fixing connecting plate; 24. Lower steel casing; 25. Steel hoop; 26. Cofferdam cutting edge; 27. Adjustable elevation steel support; 28. Burlap sack concrete layer; 29. ​​Fixed support; 30. Adjustable support; 31. Lower support steel plate; 32. Upper support steel plate; 33. Support fixing bolt; 34. Adjusting groove; 35. Inner guide support steel plate; 36. Outer guide support steel plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0022] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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, the above terms should not be construed as limiting this invention.

[0023] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0024] like Figure 1-Figure 5 The present invention provides a construction method for a double-walled steel cofferdam reinforced with a combination of deep-water, high-velocity, and shallow overburden layers, comprising the following steps:

[0025] Step 1, Construction of steel casing 8: The steel casing 8 is constructed. The steel casing 8 is installed and positioned using the steel casing guide and stabilizing device 14. During the height connection between the upper steel casing 20 and the lower steel casing 24, the internal guide steel plate 21 and steel clamp 25 are used for connection.

[0026] Step 2, reinforcement of the cofferdam with steel casing 2: Install steel casing reinforcement bracket 6 in the steel casing 8 and perform sand filling treatment 3;

[0027] Step 3, Cofferdam Sinking: Carry out the sinking construction of double-walled steel cofferdam 1. After the sinking of double-walled steel cofferdam 1 is completed, use cofferdam reinforcement steel casing 2 and cofferdam reinforcement support 5 to reinforce the water-facing cofferdam 4.

[0028] Step 4, Treatment of the cutting edge 26 of the cofferdam: The cutting edge 26 of the lower part of the double-walled steel cofferdam 1 is adjusted and fixed by the adjustable elevation steel support 27. After the lower support steel plate 31 and the upper support steel plate 32 of the adjustable elevation steel support 27 are adjusted into place, they are fixed by the fixed support 29. The inner guide support steel plate 35 and the outer guide support steel plate 36 are fixed by the adjusting slide 34 and the support fixing bolt 33.

[0029] Step 5, bottom sealing concrete 11 pouring: The bottom sealing concrete 11 of the cofferdam is poured. The steel casing 8 and the double-walled steel casing cofferdam 1 are anchored to the bottom sealing concrete 11 by the steel casing anchor plate 12 and the cofferdam anchor plate 13, respectively.

[0030] like Figure 1 The diagram shown illustrates the structure of a double-walled steel-casing cofferdam 1 reinforced with a combined structure for deep-water, high-velocity, and shallow-overburden layers. It mainly includes a double-walled steel-casing cofferdam 1, a reinforcing steel casing 2, sand filling treatment 3, a water-facing cofferdam 4, a cofferdam reinforcement support 5, a steel casing reinforcement support 6, a steel casing stabilizing steel pipe column 7, and a steel casing 8. For the construction of the double-walled steel-casing cofferdam 1 reinforced with a combined structure for deep-water, high-velocity, and shallow-overburden layers, a reinforcing steel casing 2 is installed on the inner side of the water-facing side of the double-walled steel-casing cofferdam 1. A reinforcing support 5 is installed between the reinforcing steel casing 2 and the double-walled steel-casing cofferdam 1 to reinforce the water-facing cofferdam 4, improving the overall stability of the cofferdam. The internal stability of the reinforcing steel casing 2 is enhanced by sand filling treatment 3 and the steel casing reinforcement support 6. The reinforcing steel casings 2 are connected by steel casing stabilizing steel pipe columns 7.

[0031] like Figure 2 The cross-sectional view of the double-walled steel casing cofferdam 1 shown shows that the bottom of the steel casing 8 and the double-walled steel casing cofferdam 1 are anchored to the bottom sealing concrete 11 by the steel casing anchoring wing plate 12 and the cofferdam anchoring wing plate 13, respectively. The steel casing reinforcing support 6 includes reinforcing support beams 9 and reinforcing support columns 10. Several reinforcing support beams 9 are arranged along the height direction of the reinforcing support columns 10, and the ends of several reinforcing support beams 9 are connected to the inner wall of the cofferdam reinforcing steel casing 2.

[0032] like Figure 3 The diagram shows the structure of the steel casing guide and stabilizer 14. The steel casing 8 is installed and positioned using the steel casing guide and stabilizer 14. The steel casing guide and stabilizer 14 is formed by splicing a guide beam 16 and a guide support beam 18. Several jack support platforms 17 are provided on the inner side of the guide beam 16 and the guide support beam 18. Jacks 15 are placed in the jack support platforms 17 so that the ends of the jacks 15 abut against the outer side of the steel casing 8. After the steel casing 8 is adjusted into place, it is fixed by a steel casing fixing bracket 19. The steel casing fixing bracket 19 is connected between the guide beam 16 and the steel casing 8.

[0033] like Figure 4 The diagram shows the connection structure of the steel casing 8. The steel casing 8 includes an upper steel casing 20 and a lower steel casing 24. The splice between the upper steel casing 20 and the lower steel casing 24 is connected by an internal guide steel plate 21 and a steel clamp 25. The steel clamp 25 is connected by a fixing bolt 22 and a clamp fixing connection plate 23.

[0034] The steel clamp 25 is arranged in a ring structure. The steel clamp 25 has clamp fixing connection plates 23 at both ends. After the steel clamp 25 surrounds the splice of the upper steel casing 20 and the lower steel casing 24, the clamp fixing connection plates 23 at both ends of the steel clamp 25 are fixed by fixing bolts 22 so that the steel clamp 25 positions the outside of the splice of the upper steel casing 20 and the lower steel casing 24.

[0035] The upper part of the internal guide steel plate 21 is connected to the inner wall of the upper steel casing 20, and the lower part of the internal guide steel plate 21 is inclined inward to guide the end of the lower steel casing 24.

[0036] like Figure 5 The diagram shows the structure of the cofferdam cutting edge 26. The lower cofferdam cutting edge 26 of the double-walled steel-casing cofferdam 1 is adjusted and fixed using adjustable elevation steel supports 27. A layer of burlap concrete 28 is set at the bottom of the adjustable elevation steel supports 27. The adjustable elevation steel supports 27 includes a lower support steel plate 31 and an upper support steel plate 32. The lower support steel plate 31 is connected to the inner guide support steel plate 35, and the upper support steel plate 32 is connected to the outer guide support steel plate 36. The lower support steel plate 31 and the upper support steel plate 32 are adjusted using adjustable supports 30. After the lower support steel plate 31 and the upper support steel plate 32 are adjusted to the correct position, they are fixed using fixed supports 29. The inner guide support steel plate 35 and the outer guide support steel plate 36 are fixed using adjusting grooves 34 and support fixing bolts 33.

[0037] The adjustable support 30 has threads on its outer circumference. The adjustable support 30 passes through the upper support steel plate 32 and is positioned and adjusted by bolts on both sides. The lower support steel plate 31 and the upper support steel plate 32 are provided with matching adjustment grooves 34. After the lower support steel plate 31 and the upper support steel plate 32 are adjusted, the support fixing bolts 33 pass through the adjustment grooves 34 and are fixed with the bolts.

[0038] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A construction method for a double-walled steel cofferdam reinforced with a combination of deep-water, high-velocity, shallow overburden layer, characterized in that: Includes the following steps: Step 1, Steel casing (8) construction: The steel casing (8) is installed and positioned using a steel casing guide and stabilizing device (14). During the process of connecting the upper steel casing (20) and the lower steel casing (24), the internal guide steel plate (21) and steel clamp (25) are used for connection. The steel clamp (25) is arranged in a ring structure. The steel clamp (25) has clamp fixing connection plates (23) at both ends. After the steel clamp (25) surrounds the splice of the upper steel casing (20) and the lower steel casing (24), the clamp fixing connection plates (23) at both ends of the steel clamp (25) are fixed by fixing bolts (22). The upper part of the internal guide steel plate (21) is connected to the inner wall of the upper steel casing (20), and the lower part of the internal guide steel plate (21) is inclined inward. Step 2, Treatment of steel casing reinforcement (2) for cofferdam: Install steel casing reinforcement bracket (6) in the steel casing reinforcement (2) of the cofferdam and perform sand filling treatment (3); Step 3, Cofferdam sinking: Carry out the sinking construction of the double-walled steel cofferdam (1). After the double-walled steel cofferdam (1) is sinked, the cofferdam (4) on the water-facing side is reinforced by the cofferdam reinforcement steel casing (2) and the cofferdam reinforcement bracket (5). Step 4, Treatment of the cofferdam cutting edge (26): The cofferdam cutting edge (26) at the bottom of the double-walled steel cofferdam (1) is adjusted and fixed using adjustable elevation steel supports (27); The adjustable elevation steel support (27) is provided with a burlap concrete layer (28) at the bottom. The adjustable elevation steel support (27) includes a lower support steel plate (31) and an upper support steel plate (32). The lower support steel plate (31) is connected to the inner guide support steel plate (35), and the upper support steel plate (32) is connected to the outer guide support steel plate (36). The lower support steel plate (31) and the upper support steel plate (32) are connected by an adjustable support (30) for elevation adjustment. After the lower support steel plate (31) and the upper support steel plate (32) are adjusted to the correct position, they are fixed by a fixed support (29). Step 5, bottom sealing concrete (11) pouring: the bottom sealing concrete (11) of the cofferdam is poured. The steel casing (8) and the double-walled steel box cofferdam (1) are anchored to the bottom sealing concrete (11) by the steel casing anchor plate (12) and the cofferdam anchor plate (13) respectively.

2. The construction method of the deep-water, high-velocity, shallow-overburden combined reinforced double-walled steel cofferdam according to claim 1, characterized in that: In step three, a cofferdam reinforcement steel casing (2) is installed on the inner side of the water-facing side of the double-walled steel casing cofferdam (1), a cofferdam reinforcement support (5) is installed between the cofferdam reinforcement steel casing (2) and the double-walled steel casing cofferdam (1), and adjacent cofferdam reinforcement steel casings (2) are connected by steel casing stabilizing steel pipe columns (7).

3. The construction method of the deep-water, high-velocity, shallow-overburden combined reinforced double-walled steel cofferdam according to claim 1, characterized in that: In step two, the steel casing reinforcement support (6) includes reinforcement support beams (9) and reinforcement support columns (10). Several reinforcement support beams (9) are arranged along the height direction of the reinforcement support columns (10), and the ends of several reinforcement support beams (9) are connected to the inner wall of the cofferdam reinforcement steel casing (2).

4. The construction method of the deep-water, high-velocity, shallow-overburden combined reinforced double-walled steel cofferdam according to claim 1, characterized in that: In step one, the steel casing guide and stabilizing device (14) is formed by splicing a guide beam (16) and a guide support beam (18). Several jack support platforms (17) are provided on the inner side of the guide beam (16) and the guide support beam (18). Jacks (15) are set in the jack support platforms (17) so that the ends of the jacks (15) abut against the outer side of the steel casing (8). After the steel casing (8) is adjusted into place, it is fixed by a steel casing fixing bracket (19). The steel casing fixing bracket (19) is connected between the guide beam (16) and the steel casing (8).

5. The construction method of the deep-water, high-velocity, shallow-overburden combined reinforced double-walled steel cofferdam according to claim 1, characterized in that: The adjustable support (30) has threads on its outer periphery. The adjustable support (30) passes through the upper support steel plate (32) and is positioned and adjusted by bolts on both sides. The inner guide support steel plate (35) and the outer guide support steel plate (36) are provided with matching adjustment grooves (34). After the inner guide support steel plate (35) and the outer guide support steel plate (36) are adjusted, the support fixing bolts (33) pass through the adjustment grooves (34) for fixing.

6. A double-walled steel-casing cofferdam reinforced with a combination of deep-water, high-velocity, and shallow overburden layers, characterized in that: The method described in any one of claims 1-5 for constructing a double-walled steel cofferdam reinforced with a combination of deep-water, high-velocity, and shallow overburden layers was used.

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