Deep-water high-flow-speed shallow covering layer combined reinforced double-wall steel sleeve box cofferdam and construction method

Abstract

The invention provides a deepwater high-flow-speed shallow covering layer combined reinforced double-wall steel sleeve box cofferdam and a construction method. The deepwater high-flow-speed shallow covering layer combined reinforced double-wall steel sleeve box cofferdam mainly comprises a double-wall steel sleeve box cofferdam body, cofferdam reinforcing steel pile casings, sand filling treatment, an upstream face cofferdam body, cofferdam reinforcing supports, steel pile casing reinforcing supports, steel pile casing stabilizing steel pipe columns and steel pile casings. According to deepwater high-flow-speed shallow covering layer combined reinforcing double-wall steel jacket box cofferdam construction, a cofferdam reinforcing steel casing and a cofferdam reinforcing support are adopted for reinforcing an upstream face cofferdam, the overall stability of the cofferdam is improved, sand filling treatment and steel casing reinforcing supports are adopted in the cofferdam reinforcing steel casing, and the stability of the cofferdam reinforcing steel casing is improved; the cofferdam reinforcing steel casings are connected through the steel casing stabilizing steel pipe columns. The invention belongs to the field of civil engineering, and relates to a construction method for a deepwater high-flow-speed shallow covering layer combined reinforced double-wall steel jacket box cofferdam, which effectively reduces the engineering cost, accelerates the construction speed, and can obtain better technical and economic benefits when being applied to actual engineering.

Description

Technical Field

[0001] The invention relates to the field of civil engineering, in particular to a deep water high flow velocity shallow cover layer combined reinforced double-wall steel casing cofferdam and a construction method. Background Art

[0002] With the continuous advancement of transportation infrastructure construction, more and more bridges need to be built in harsh water environments. The deep-water environment greatly increases the water pressure on the cofferdam, and the construction difficulty and risk are significantly increased; the high flow rate will not only produce a strong scouring force on the cofferdam structure, but also affect the stability of various materials and equipment during the construction process; and the shallow cover layer cannot provide sufficient anchoring force for the cofferdam, making it difficult for the cofferdam to be stably positioned. In this context, traditional single-wall steel cofferdams, earth cofferdams, etc. are difficult to meet construction requirements and are prone to safety accidents such as deformation and collapse, which seriously affect the progress and quality of the project. Therefore, it is urgent to develop a cofferdam construction technology suitable for deep water, high flow rate and shallow cover layers to solve the problem of bridge foundation construction under complex water conditions and ensure the smooth progress of the project.

[0003] Conventional cofferdam construction has problems such as poor overall stability of the cofferdam, low efficiency in steel casing connection and positioning construction, and low efficiency in cofferdam blade foot treatment construction. Summary of the Invention

[0004] The purpose of the present invention is to provide a deep-water, high-flow-rate, shallow-cover layer combined reinforced double-wall steel jacketed cofferdam and a construction method to solve the above-mentioned technical problems.

[0005] To solve the above technical problems, the present invention provides a construction method for a double-wall steel box cofferdam with a deep water, high flow velocity and shallow cover layer, comprising the following steps: Step 1: Steel casing construction: Use the steel casing guide and stabilization device to install and position the steel casing. Use internal guide steel plates and steel clamps to connect the upper and lower steel casings. Step 2: Cofferdam reinforcement steel casing treatment: install steel casing reinforcement bracket in the steel casing and perform sand filling treatment; Step 3: Sinking the cofferdam: Sinking the double-walled steel box cofferdam is carried out. After the sinking of the double-walled steel box cofferdam is completed, the cofferdam reinforcement steel casing and cofferdam reinforcement bracket are used to reinforce the cofferdam on the waterside; Step 4: Treatment of cofferdam blade foot: The cofferdam blade foot at the bottom of the double-wall steel box cofferdam is adjusted and fixed with adjustable elevation steel piers; Step 5: Pouring of bottom concrete: The bottom concrete of the cofferdam is poured. The steel casing and the double-walled steel box cofferdam are anchored to the bottom concrete using steel casing anchoring wing plates and cofferdam anchoring wing plates respectively.

[0006] The beneficial effects of the present invention are: (1) Use cofferdam reinforcement brackets and sand filling to strengthen the cofferdam reinforcement steel casing to improve the stability of the cofferdam reinforcement steel casing supporting the water-facing cofferdam; (2) Use steel casing guide and stabilization devices to guide and position the steel casing, and use internal guide steel plates and steel clamps to connect the steel casing to improve the construction efficiency of the steel casing; (3) Use an adjustable elevation steel pier structure to support the cofferdam blade foot and improve the construction efficiency of the cofferdam blade foot treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a structural diagram of a double-walled steel box cofferdam with a deep water, high velocity and shallow overburden. Figure 2 This is a cross-sectional view of a double-walled steel box cofferdam; Figure 3 This is the structural diagram of the steel casing guide and stabilization device; Figure 4 This is the steel casing connection structure diagram; Figure 5 This is the structural diagram of the cofferdam blade foot treatment.

[0008] In the figure: 1. Double-walled steel box cofferdam; 2. Steel casing for cofferdam reinforcement; 3. Sand filling treatment; 4. Water-facing cofferdam; 5. Cofferdam reinforcement bracket; 6. Steel casing reinforcement bracket; 7. Steel casing stabilizing steel pipe column; 8. Steel casing; 9. Reinforcement bracket crossbeam; 10. Reinforcement bracket column; 11. Bottom seal concrete; 12. Steel casing anchor wing plate; 13. Cofferdam anchor wing plate; 14. Steel casing guide and stabilization device; 15. Jack; 16. Guide crossbeam; 17. Jack support platform; 18. Guide support beam; 1 9. Steel casing fixing bracket; 20. Upper steel casing; 21. Internal guide steel plate; 22. Fixing bolts; 23. Clamp fixing connecting plate; 24. Lower steel casing; 25. Steel clamp; 26. Cofferdam blade foot; 27. Adjustable elevation steel pier; 28. Gunny bag concrete layer; 29. Fixed pier; 30. Adjustable pier; 31. Lower support steel plate; 32. Upper support steel plate; 33. Pier fixing bolts; 34. Adjustment slide; 35. Inner guide support steel plate; 36. Outer guide support steel plate. DETAILED DESCRIPTION

[0009] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0010] It should be understood by those skilled in the art that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0011] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0012] like Figure 1-Figure 5 The present invention provides a construction method for a double-walled steel box cofferdam with a deep water, high flow velocity, and shallow overburden, comprising the following steps: Step 1, construction of steel casing 8: Construction of steel casing 8, using steel casing guide and stabilization device 14 to install and position steel casing 8, and connecting upper steel casing 20 and lower steel casing 24 by internal guide steel plate 21 and steel hoop 25; Step 2: Cofferdam reinforcement steel casing 2 treatment: install steel casing reinforcement bracket 6 in the steel casing 8 and perform sand filling treatment 3; Step 3: sinking the cofferdam: sinking the double-walled steel box cofferdam 1. After the double-walled steel box cofferdam 1 is sunk, the cofferdam reinforcement steel casing 2 and the cofferdam reinforcement bracket 5 are used to reinforce the cofferdam 4 on the water-facing side. Step 4: Processing the cofferdam blade foot 26: The cofferdam blade foot 26 at the lower part of the double-wall steel box cofferdam 1 is adjusted and fixed with an adjustable elevation steel buttress 27. After the lower supporting steel plate 31 and the upper supporting steel plate 32 of the adjustable elevation steel buttress 27 are adjusted into place, they are fixed with a fixed buttress 29. The inner guide support steel plate 35 and the outer guide support steel plate 36 are fixed with an adjusting chute 34 and a buttress fixing bolt 33. Step 5, pouring bottom seal concrete 11: pouring the cofferdam bottom seal concrete 11, the steel casing 8 and the double-walled steel box cofferdam 1 are anchored to the bottom seal concrete 11 using steel casing anchoring wing plates 12 and cofferdam anchoring wing plates 13 respectively.

[0013] like Figure 1The structure diagram of a double-walled steel-cased cofferdam 1 for deepwater, high-velocity, and shallow overburden reinforcement is shown. It primarily comprises a double-walled steel-cased cofferdam 1, a cofferdam reinforcement steel casing 2, sand filling treatment 3, a water-facing cofferdam 4, cofferdam reinforcement brackets 5, steel casing reinforcement brackets 6, steel casing stabilization steel pipe columns 7, and steel casing 8. For the construction of a double-walled steel-cased cofferdam 1 for deepwater, high-velocity, and shallow overburden reinforcement, a cofferdam reinforcement steel casing 2 is installed on the inner side of the water-facing surface of the double-walled steel-cased cofferdam 1. Cofferdam reinforcement brackets 5 are installed between the cofferdam reinforcement steel casing 2 and the double-walled steel-cased cofferdam 1 to reinforce the water-facing cofferdam 4 and improve its overall stability. Sand filling treatment 3 and steel casing reinforcement brackets 6 are used internally to enhance the stability of the cofferdam reinforcement steel casing 2. Steel casing stabilization steel pipe columns 7 are used to connect the cofferdam reinforcement steel casings 2.

[0014] like Figure 2 In the cross-sectional view of the double-walled steel casing cofferdam 1 shown, the bottom of the steel casing 8 and the double-walled steel casing cofferdam 1 are anchored to the bottom concrete 11 by steel casing anchoring wing plates 12 and cofferdam anchoring wing plates 13 respectively. The steel casing reinforcement bracket 6 includes a reinforcement bracket cross beam 9 and a reinforcement bracket column 10. Several reinforcement bracket cross beams 9 are arranged along the height direction of the reinforcement bracket column 10, and the ends of several reinforcement bracket cross beams 9 are connected to the inner wall of the cofferdam reinforcement steel casing 2.

[0015] like Figure 3 As shown in the structural diagram of the steel casing guiding and stabilizing device 14, the steel casing 8 is installed and positioned using the steel casing guiding and stabilizing device 14. The steel casing guiding and stabilizing device 14 is formed by splicing a guide beam 16 and a guide support beam 18, and a number of jack support platforms 17 are provided on the inner sides of the guide beam 16 and the guide support beam 18. The jack 15 is provided in the jack support platform 17 so that the end of the jack 15 is against the outer side of the steel casing 8. After the steel casing 8 is adjusted into place, it is fixed using a steel casing fixing bracket 19, and the steel casing fixing bracket 19 is connected between the guide beam 16 and the steel casing 8.

[0016] like Figure 4 As shown in the connection structure diagram of the steel casing 8, the steel casing 8 includes an upper steel casing 20 and a lower steel casing 24, and the joints of the upper steel casing 20 and the lower steel casing 24 are connected by an internal guide steel plate 21 and a steel hoop 25, and the steel hoop 25 is connected by a fixing bolt 22 and a hoop fixing connecting plate 23.

[0017] Among them, the steel hoop 25 is arranged in an annular structure, and has a hoop fixing connecting plate 23 at both ends of the steel hoop 25. After the steel hoop 25 surrounds the joint of the upper steel casing 20 and the lower steel casing 24, the hoop fixing connecting plates 23 at both ends of the steel hoop 25 are fixed by fixing bolts 22 to position the steel hoop 25 on the outside of the joint of the upper steel casing 20 and the lower steel casing 24.

[0018] The upper portion of the internal guide steel plate 21 is connected to the inner wall of the upper steel casing 20 , and the lower portion of the internal guide steel plate 21 is tilted inwardly to guide the end of the lower steel casing 24 .

[0019] like Figure 5 As shown in the structural diagram of the cofferdam blade foot 26 processing, the lower cofferdam blade foot 26 of the double-wall steel box cofferdam 1 is adjusted and fixed with an adjustable elevation steel pier 27, and a sack concrete layer 28 is set at the lower part of the adjustable elevation steel pier 27. The adjustable elevation steel pier 27 includes a lower supporting steel plate 31 and an upper supporting steel plate 32. The lower supporting steel plate 31 is connected to the inner guide support steel plate 35, and the upper supporting steel plate 32 is connected to the outer guide support steel plate 36. An adjustable pier 30 is used between the lower supporting steel plate 31 and the upper supporting steel plate 32 for elevation adjustment. After the lower supporting steel plate 31 and the upper supporting steel plate 32 are adjusted into place, they are fixed with a fixed pier 29. The inner guide support steel plate 35 and the outer guide support steel plate 36 are fixed with an adjusting slide 34 and a pier fixing bolt 33.

[0020] Among them, the outer periphery of the adjustable pier 30 has a thread, and the adjustable pier 30 passes through the upper supporting steel plate 32 and is positioned and adjusted by bolts on both sides; the lower supporting steel plate 31 and the upper supporting steel plate 32 are both provided with matching adjustment grooves 34. After the supporting adjustment of the lower supporting steel plate 31 and the upper supporting steel plate 32 is completed, the pier fixing bolts 33 are passed through the adjustment grooves 34 and fixed with the bolts.

[0021] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the scope of protection of the present invention.

Claims

1. The construction method of a double-wall steel box cofferdam with deep water, high flow rate and shallow cover layer is characterized by: The following steps are involved: Step 1, construction of steel casing (8): using the steel casing guide and stabilizing device (14) to install and position the steel casing (8), and using the internal guide steel plate (21) and the steel hoop (25) to connect the upper steel casing (20) and the lower steel casing (24) during the height connection process; Step 2, cofferdam reinforcement steel casing (2) treatment: installing a steel casing reinforcement bracket (6) in the steel casing (8) and performing sand filling treatment (3); Step 3, sinking the cofferdam: sinking the double-walled steel box cofferdam (1). After the double-walled steel box cofferdam (1) is sunk, the cofferdam reinforcement steel casing (2) and the cofferdam reinforcement bracket (5) are used to reinforce the water-facing cofferdam (4); Step 4, cofferdam blade foot (26) processing: the cofferdam blade foot (26) at the lower part of the double-wall steel box cofferdam (1) is adjusted and fixed with an adjustable elevation steel buttress (27); Step 5, pouring of bottom seal concrete (11): pouring of cofferdam bottom seal concrete (11), the steel casing (8) and the double-walled steel box cofferdam (1) are anchored to the bottom seal concrete (11) using steel casing anchoring wing plates (12) and cofferdam anchoring wing plates (13) respectively.

2. The construction method of the deep-water, high-velocity, shallow-cover combined reinforced double-wall steel jacketed cofferdam according to claim 1 is characterized by: In step three, a cofferdam reinforcement steel casing (2) is set on the inner side of the water-facing surface of the double-walled steel casing cofferdam (1), a cofferdam reinforcement bracket (5) is set 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-flow-rate, shallow-cover combined reinforced double-wall steel jacketed cofferdam according to claim 1 is characterized by: In step 2, the steel casing reinforcement bracket (6) includes a reinforcement bracket crossbeam (9) and a reinforcement bracket column (10), and a plurality of reinforcement bracket crossbeams (9) are arranged along the height direction of the reinforcement bracket column (10), and the ends of the plurality of reinforcement bracket crossbeams (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-cover combined reinforced double-wall steel jacketed cofferdam according to claim 1 is characterized by: In step 1, the steel casing guide stabilizing device (14) is formed by splicing a guide crossbeam (16) and a guide support beam (18), and a plurality of jack support platforms (17) are provided on the inner sides of the guide crossbeam (16) and the guide support beam (18). The jack (15) is provided in the jack support platform (17) so that the end of the jack (15) is 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), and the steel casing fixing bracket (19) is connected between the guide crossbeam (16) and the steel casing (8).

5. The construction method of the deep-water, high-velocity, shallow-cover combined reinforced double-wall steel jacketed cofferdam according to claim 1 is characterized by: In step 1, the steel hoop (25) is arranged in an annular structure, and the two ends of the steel hoop (25) are provided with hoop fixing connecting plates (23). After the steel hoop (25) surrounds the joint of the upper steel casing (20) and the lower steel casing (24), the hoop fixing connecting plates (23) at both ends of the steel hoop (25) are fixed by fixing bolts (22).

6. The construction method of the deep-water, high-velocity, shallow-cover combined reinforced double-wall steel jacketed cofferdam according to claim 1 is characterized by: In step 1, the upper portion of the internal guide steel plate (21) is connected to the inner wall of the upper steel casing (20), and the lower portion of the internal guide steel plate (21) is tilted inward.

7. The construction method of a deep-water, high-velocity, shallow-cover combined reinforced double-wall steel jacketed cofferdam according to claim 1 is characterized by: In step 4, a sack concrete layer (28) is provided at the lower part of the adjustable elevation steel buttress (27), wherein the adjustable elevation steel buttress (27) comprises a lower supporting steel plate (31) and an upper supporting steel plate (32), wherein the lower supporting steel plate (31) is connected to an inner guide supporting steel plate (35), and the upper supporting steel plate (32) is connected to an outer guide supporting steel plate (36), and an adjustable buttress (30) is used between the lower supporting steel plate (31) and the upper supporting steel plate (32) for elevation adjustment, and after the lower supporting steel plate (31) and the upper supporting steel plate (32) are adjusted in place, they are fixed by using a fixed buttress (29).

8. The construction method of the deep-water, high-velocity, shallow-cover combined reinforced double-wall steel jacketed cofferdam according to claim 7 is characterized by: The outer periphery of the adjustable buttress (30) is provided with a thread, and the adjustable buttress (30) passes through the upper supporting steel plate (32) and is positioned and adjusted by bolts on both sides; the lower supporting steel plate (31) and the upper supporting steel plate (32) are both provided with matching adjusting grooves (34), and after the supporting adjustment of the lower supporting steel plate (31) and the upper supporting steel plate (32) is completed, the buttress fixing bolts (33) are passed through the adjusting grooves (34) for fixing.

9. A deep water, high velocity, shallow overburden combined reinforced double-wall steel jacketed cofferdam, characterized by: It is obtained by the construction method of the deep-water high-flow-velocity shallow-cover combined reinforced double-wall steel box cofferdam according to any one of claims 1-8.

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