Tidal Influence on External Steel Casing Connected Combined Drainage Single-Wall Steel Hoisted Cofferdam and Construction Method

Abstract

This invention provides a method for constructing a single-walled steel caisson cofferdam with external steel casing for combined drainage under tidal influences. The cofferdam mainly includes a single-walled steel caisson cofferdam, pulleys, wire ropes, a winch, pull rings, reinforcing diagonal braces for the steel caisson, a steel casing, reinforcing guide plates for the steel caisson, guide pulleys, and a water-collecting steel casing. For the construction of a single-walled steel caisson cofferdam with external steel casing for combined drainage under tidal influences, the cofferdam is reinforced internally with reinforcing guide plates and diagonal braces. Pulleys, wire ropes, a winch, pull rings, and guide pulleys guide and position the cofferdam during installation. A water-collecting steel casing is installed on the outside of the cofferdam for water collection and drainage. This invention belongs to the field of civil engineering and provides a construction method for a single-walled steel caisson cofferdam with external steel casing for combined drainage under tidal influences. This method effectively reduces project costs, accelerates construction speed, and can achieve good technical and economic benefits in practical engineering applications.

Description

Technical Field

[0001] This invention relates to the field of civil engineering, and in particular to a single-walled steel caisson cofferdam with external steel casing connected to a combined drainage system and construction method for tidal-affected structures. Background Technology

[0002] Tidal phenomena are widespread in various types of water bodies, and the periodic rise and fall of water levels they cause pose significant technical challenges to cofferdam construction. In traditional cofferdam construction methods, when encountering tidal influences, rapid changes in water level can lead to unstable water pressure differences between the inside and outside of the cofferdam, causing the cofferdam structure to bear large lateral forces and buoyancy, thus increasing the risk of cofferdam instability.

[0003] Conventional single-wall steel cofferdam construction suffers from problems such as poor positioning accuracy, low construction efficiency, poor connection between steel casing and bottom concrete, and poor drainage effect. Summary of the Invention

[0004] The purpose of this invention is to provide a method for constructing a single-walled steel caisson cofferdam with external steel casing connected to a combined drainage system to solve the above-mentioned technical problems caused by tidal influences.

[0005] To solve the above-mentioned technical problems, the present invention provides a construction method for a combined drainage single-wall steel caisson cofferdam with external steel casing affected by tidal forces, comprising the following steps:

[0006] Step 1: Steel casing construction: Install water collection steel casings on the outside of the cofferdam location;

[0007] Step 2, Fabrication and Installation of Single-Wall Steel Hoisting Box: Lower the single-wall steel hoisting box around several steel casings, so that the single-wall steel hoisting box fits into the steel casings. Use wire ropes and winches to guide and position the installation of the single-wall steel hoisting box cofferdam.

[0008] Step 3: Cofferdam drainage system treatment: A pre-reserved water collection ditch and a water inlet hole are set on the bottom plate of the steel caisson of the single-wall steel caisson cofferdam. The water inlet hole of the bottom plate of the steel caisson connects the inner side of the single-wall steel caisson cofferdam with the pre-reserved water collection ditch of the steel caisson. A drainage pipe is set in the pre-reserved water collection ditch of the steel caisson to drain the water into the water collection steel casing.

[0009] Step 4, Steel casing treatment: The steel casing is anchored to the bottom concrete of the single-wall steel caisson cofferdam through counter-pressure supports and steel casing anchoring clamps. Grouting pipes and external leakage re-grouting pipes are set around the steel casing of the single-wall steel caisson cofferdam for grouting and sealing treatment.

[0010] Step 5: Pouring bottom concrete: The concrete hopper support bracket is cross-supported on the upper part of several steel casings. The concrete hopper support bracket is equipped with hopper guide columns, hopper diagonal braces and hopper support beams to support the concrete hopper.

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

[0012] (1) The cofferdam installation positioning accuracy and construction efficiency are improved by adopting the cofferdam guide support, steel casing guide support and winch and pulley combination sinking technology;

[0013] (2) The connection between the steel casing and the bottom sealing concrete is reinforced by using steel casing anchoring clamps, counter-pressure supports and repeated grouting pipes to improve the connection strength between the steel casing and the bottom sealing concrete;

[0014] (3) Use water collection steel casing and steel caisson to reserve water collection ditch to remove water from the cofferdam and improve the drainage effect of the cofferdam;

[0015] (4) Use concrete hopper support brackets for bottom sealing concrete pouring to improve the efficiency and quality of bottom sealing concrete pouring. Attached Figure Description

[0016] Figure 1 This is a diagram of a single-walled steel caisson cofferdam structure with external steel casing connected to a combined drainage system, influenced by tidal forces.

[0017] Figure 2 This is a structural diagram of the steel cofferdam guide installation;

[0018] Figure 3 This is a structural diagram of the steel casing and the water collection steel casing;

[0019] Figure 4 This is a structural diagram of the support frame for the concrete pouring hopper;

[0020] Figure 5 This is a cross-sectional view of the support frame for the concrete pouring hopper.

[0021] In the diagram: 1. Single-wall steel caisson cofferdam; 2. Pulley; 3. Wire rope; 4. Winch; 5. Pull ring; 6. Steel caisson reinforcing diagonal brace; 7. Steel casing; 8. Steel caisson guide reinforcing steel plate; 9. Guide pulley; 10. Steel caisson side plate; 11. Cofferdam guide support; 12. Steel casing guide support; 13. Guide support crossbeam; 14. Guide support diagonal brace; 15. Jack; 16. Externally exposed repeated grouting pipe; 17. Steel casing anchoring clamp; 18. Grouting pipe. ; 19. Clamp connecting plate; 20. Clamp fixing bolt; 21. Steel caisson bottom plate; 22. Steel caisson reserved water collection ditch; 23. Drainage pipe; 24. Water collection steel casing; 25. Water inlet hole of steel caisson bottom plate; 26. Anchoring steel bar; 27. Concrete pouring hopper support bracket; 28. Concrete pouring hopper; 29. ​​Hopper guide column; 30. Hopper diagonal brace; 31. Hopper support crossbeam; 32. Hopper guide pipe; 33. Counter pressure bracket; 34. Bottom sealing concrete. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] like Figure 1-Figure 5 The present invention provides a construction method for a single-walled steel caisson cofferdam with external steel casing connected to a combined drainage system under tidal influence, comprising the following steps:

[0026] Step 1, Construction of Steel Casing 7: Construct steel casing 7 by installing water collection steel casing 24 on the outside of the cofferdam location;

[0027] Step 2, Fabrication and Installation of Single-Wall Steel Hoisting Casing: The fabricated single-wall steel hoisting casing is transported to the construction site using transportation equipment. It is then lowered around several steel casings 7 using cranes or floating cranes, so that it fits into the steel casings 7. The installation position of the single-wall steel hoisting casing cofferdam 1 is guided and positioned using pulleys 2, wire ropes 3, winches 4, pull rings 5, and guide pulleys 9. The position of the side plate 10 of the single-wall steel hoisting casing cofferdam 1 is adjusted and positioned using cofferdam guide supports 11.

[0028] One end of the wire rope 3 is connected to the four sides of the single-wall steel caisson via a pull ring 5, and the other end is connected to the winch 4. The wire rope 3 is wound around the pulley 2 and the guide pulley 9 in sequence, so that the single-wall steel caisson can be moved and positioned by the wire rope 3 to form the single-wall steel caisson cofferdam 1. The inner side of the steel caisson side plate 10 of the single-wall steel caisson cofferdam 1 has a cofferdam guide support 11, and the side of the steel casing 7 has a steel casing guide support 12. The cofferdam guide support 11 and the steel casing guide support 12 have matching guide slopes so that the single-wall steel caisson can be guided to its lower position by the guide slopes when it is hoisted.

[0029] Step 3, Cofferdam Drainage System Treatment: A pre-reserved water collection ditch 22 and a water inlet hole 25 are set on the bottom plate 21 of the steel caisson of the single-wall steel caisson cofferdam 1. The water inlet hole 25 of the bottom plate of the steel caisson connects the inner side of the single-wall steel caisson cofferdam 1 with the pre-reserved water collection ditch 22 of the steel caisson. A drain pipe 23 is set in the pre-reserved water collection ditch 22 of the steel caisson to drain water into the water collection steel casing 24.

[0030] Step 4, Steel casing 7 treatment: The steel casing 7 is anchored to the bottom sealing concrete 34 in the single-wall steel caisson cofferdam 1 by the counter-pressure bracket 33 and the steel casing anchoring clamp 17. The steel casing anchoring clamp 17 is provided with clamp connecting plates 19 at both ends. The clamp connecting plates 19 of two adjacent steel casing anchoring clamps 17 are connected by clamp fixing bolts 20. Several anchoring steel bars 26 are arranged at intervals on the outside of the steel casing anchoring clamp 17. Grouting pipes 18 and external leakage repeated grouting pipes 16 are set around the steel casing 7 in the single-wall steel caisson cofferdam 1 for grouting and sealing treatment.

[0031] Step 5, Pouring the bottom sealing concrete 34: The bottom sealing concrete 34 is poured using the concrete hopper support 27 and the concrete hopper 28. The concrete hopper support 27 is cross-supported on the upper part of several steel casings 7. The concrete hopper support 27 is equipped with hopper guide columns 29, hopper diagonal braces 30 and hopper support beams 31 to support the concrete hopper 28.

[0032] like Figure 1The diagram shown illustrates the structure of the external steel casing 7 connecting to the combined drainage single-wall steel caisson cofferdam 1, which is affected by tidal forces. It mainly includes the single-wall steel caisson cofferdam 1, pulleys 2, wire ropes 3, winches 4, pull rings 5, steel caisson reinforcing diagonal braces 6, steel casing 7, steel caisson guide reinforcing steel plates 8, guide pulleys 9, and water-collecting steel casing 24. For the construction of the external steel casing 7 connecting to the combined drainage single-wall steel caisson cofferdam 1 under tidal influence, the single-wall steel caisson cofferdam 1 is reinforced internally with steel caisson guide reinforcing steel plates 8 and steel caisson reinforcing diagonal braces 6. The steel caisson reinforcing diagonal braces 6 are located at the inner corner of the single-wall steel caisson cofferdam 1. Pulleys 2, wire ropes 3, winches 4, pull rings 5, and guide pulleys 9 are used to guide and position the installation of the single-wall steel caisson cofferdam 1. A water-collecting steel casing 24 is installed on the outer side of the single-wall steel caisson cofferdam 1 for water collection and drainage.

[0033] like Figure 2 The diagram shows the guide installation structure of the steel caisson cofferdam. The single-wall steel caisson cofferdam 1 uses the cofferdam guide support 11 to adjust and position the side plate 10 of the steel caisson. The upper outer side of the steel casing 7 is equipped with steel casing guide support 12, guide support beam 13, guide support diagonal brace 14 and jack 15 to support and adjust the steel caisson.

[0034] The guide support beam 13 is located on the outside of the steel casing 7. The guide support diagonal brace 14 is used to connect the guide support beam 13 and the steel casing 7. The jack 15 is located on the upper part of the guide support beam 13, and the steel casing guide support 12 is located at the end of the jack 15 so that the jack 15 can push the steel casing guide support 12 to move, thereby controlling the lowering position of the cofferdam guide support 11 through the steel casing guide support 12.

[0035] like Figure 3 The diagram shows the structure of the steel casing 7 and the water collection steel casing 24. The water collection steel casing 24 is set on the outside of the single-wall steel caisson cofferdam 1. The steel caisson bottom plate 21 is provided with a reserved water collection ditch 22 and a water inlet hole 25. A drainage pipe 23 is set in the reserved water collection ditch 22 to drain water into the water collection steel casing 24. The steel casing 7 is provided with a counter-pressure support 33 and a steel casing anchoring clamp 17 to anchor to the bottom sealing concrete 34. The steel casing anchoring clamp 17 is provided with a clamp connecting plate 19, clamp fixing bolts 20 and anchoring steel bars 26. The steel casing 7 is provided with a grouting pipe 18 and an external leakage repeated grouting pipe 16 around it for grouting and sealing treatment.

[0036] like Figures 4-5The diagram shows the structure of the concrete hopper support 27. The single-wall steel cofferdam 1 uses the concrete hopper support 27 and the concrete hopper 28 for bottom sealing concrete 34 pouring. The concrete hopper support 27 is cross-supported on the upper part of several steel casings 7. The concrete hopper support 27 is equipped with hopper guide columns 29, hopper diagonal braces 30 and hopper support beams 31 to support the concrete hopper 28. The lower part of the concrete hopper 28 is equipped with a hopper guide pipe 32.

[0037] 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 single-walled steel caisson cofferdam with external steel casing connected to a combined drainage system under tidal influence, characterized in that... Includes the following steps: Step 1, Steel casing (7) construction: Steel casing (7) construction is carried out, and water collection steel casing (24) is installed on the outside of the cofferdam location; Step 2, Single-wall steel caisson fabrication and installation: Lower the single-wall steel caisson around several steel casings (7) so that the single-wall steel caisson fits into the steel casings (7). Use wire rope (3) and winch (4) to guide and position the installation of the single-wall steel caisson cofferdam (1). One end of the wire rope (3) is connected to the four sides of the single-wall steel box through the pull ring (5), and the other end is connected to the winch (4). The wire rope (3) is wound around the pulley (2) and the guide pulley (9) in sequence so that the single-wall steel box can be moved and positioned by the wire rope (3) to form a single-wall steel box cofferdam (1). The steel caisson side plate (10) of the single-wall steel caisson cofferdam (1) has a cofferdam guide support (11) on the inner side of the steel caisson side plate (10). The guide support beam (13) is set on the outer side of the steel casing (7). The guide support diagonal brace (14) is used to connect the guide support beam (13) and the steel casing (7). The jack (15) is set on the upper part of the guide support beam (13), and the steel casing guide support (12) is set at the end of the jack (15) so that the jack (15) can push the steel casing guide support (12) to move. The cofferdam guide support (11) and the steel casing guide support (12) have matching guide slopes. Step 3, Cofferdam Drainage System Treatment: A pre-reserved water collection ditch (22) and a water inlet hole (25) are set on the bottom plate (21) of the steel caisson of the single-wall steel caisson cofferdam (1). The water inlet hole (25) of the bottom plate of the steel caisson connects the inner side of the single-wall steel caisson cofferdam (1) with the pre-reserved water collection ditch (22). A drain pipe (23) is set in the pre-reserved water collection ditch (22) of the steel caisson to drain water into the water collection steel casing (24). Step 4, Steel casing (7) treatment: The steel casing (7) is anchored to the bottom sealing concrete (34) in the single-wall steel caisson cofferdam (1) by the counter-pressure bracket (33) and the steel casing anchoring clamp (17). The single-wall steel caisson cofferdam (1) is located around the steel casing (7) and grouting pipe (18) and external leakage repeat grouting pipe (16) are installed for grouting and sealing treatment. Step 5, bottom sealing concrete (34) pouring: The concrete pouring hopper support bracket (27) is cross-erected on the upper part of several steel casings (7). The concrete pouring hopper support bracket (27) is equipped with hopper guide column (29), hopper diagonal brace (30) and hopper support beam (31) to support the concrete pouring hopper (28).

2. The construction method of the tidal-affected external steel casing connected combined drainage single-wall steel caisson cofferdam according to claim 1, characterized in that: Step 4: The steel casing anchoring clamp (17) is provided with clamp connecting plates (19) at both ends. The clamp connecting plates (19) of two adjacent steel casing anchoring clamps (17) are connected by clamp fixing bolts (20). Several anchoring steel bars (26) are arranged at intervals on the outside of the steel casing anchoring clamp (17).

3. The construction method of the tidal-affected external steel casing connected combined drainage single-wall steel caisson cofferdam according to claim 1, characterized in that: The single-wall steel caisson cofferdam (1) is equipped with a steel caisson guide reinforcing steel plate (8) and a steel caisson reinforcing diagonal brace (6), and the steel caisson reinforcing diagonal brace (6) is located at the inner corner of the single-wall steel caisson cofferdam (1).

4. The construction method of the tidal-affected external steel casing connected combined drainage single-wall steel caisson cofferdam according to claim 1, characterized in that: In step five, a hopper guide pipe (32) is installed at the bottom of the concrete pouring hopper (28).

5. A tidal-affected external steel casing connected to a combined drainage single-wall steel caisson cofferdam, characterized in that: The method described in any one of claims 1-4 for constructing a single-walled steel caisson cofferdam with external steel casing connected to a combined drainage system under tidal influence is used to obtain the structure.

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