Shallow water steel cofferdam structure and installation method

Abstract

The present application relates to the technical field of steel cofferdam, and disclose a kind of shallow water area steel cofferdam structure and installation method, including circular steel cofferdam, the upper end outer wall of circular steel cofferdam is equipped with deployment and retraction waterproof unit, deployment and retraction waterproof unit includes the support ring of being installed in the outer wall of circular steel cofferdam, the upper surface of support ring is fixedly connected with two symmetrical distribution support sleeve.The motor in deployment and retraction waterproof unit can drive movable arc plate and multiple support arc plate to unfold, so as to open tarpaulin, the opening of the upper end of circular steel cofferdam is shielded, rainwater is avoided to enter and influence construction, when not using, movable plate and multiple support plate can be retracted, and tarpaulin is retracted, so as to not produce shelter to the upper end of circle, overall structure is simple, it is convenient to deploy and retract tarpaulin, simultaneously, the opening of the upper end of circular steel cofferdam is completely shielded, rainproof is better, improve practicality.

Description

Technical Field

[0001] This invention relates to the field of steel cofferdam technology, specifically to a steel cofferdam structure and installation method for shallow water areas. Background Technology

[0002] Steel cofferdams refer to cofferdams constructed using steel structures in engineering construction. They include steel sheet pile cofferdams, steel caisson cofferdams, steel hanging cofferdams, steel pipe pile cofferdams, and other forms of steel cofferdams. Steel cofferdams are temporary water-retaining structures used to ensure the excavation and masonry of foundation works. Their functions are to prevent and contain water, as well as to support the walls of the foundation pit. They are generally used in shallow water areas.

[0003] Existing technology, such as patent publication number CN113818458A, discloses a steel sheet cofferdam structure, which includes steel sheet piles forming a rectangular cofferdam. The top of each steel sheet pile has a base and a first rotating plate rotatably connected to the top of the base. The tops of two opposite sides of the rectangular cofferdam also have bases, which extend along the entire length of the sides of the rectangular cofferdam. The first rotating plate extends along the entire length of the base. An insertion groove corresponding to the steel sheet pile is formed on the bottom end face of the base, and the top of the steel sheet pile is inserted into the insertion groove. Multiple locking elements are provided on the side of the base facing away from the steel sheet pile for locking the base to the steel sheet pile. A protrusion extending along the length of the first rotating plate is provided on the side of the first rotating plate closest to the other first rotating plate, and the protrusion is located at the end of the first rotating plate away from the base. A locking groove is formed on the side of the first rotating plate facing the other first rotating plate for engaging the protrusion on the other first rotating plate. This application has the effect of reducing rainwater ingress into the rectangular cofferdam.

[0004] While the aforementioned existing technologies have significant beneficial effects, they still have shortcomings:

[0005] In the aforementioned prior art, when the area of ​​the sheet pile is large, both the first and second rotating plates require the use of a floating crane for lifting, which is cumbersome and the floating crane is also affected by heavy rain, resulting in poor safety. In addition, in large sheet piles, it is inconvenient to connect the rope to the ring, and the strength of the connection is not high when tied manually, which can easily cause the first rotating plate to rotate in strong winds. Furthermore, when the two first rotating plates overlap to shield the upper end of the sheet pile, the two sides of the two first rotating plates are still open, and rainwater can easily enter the sheet pile during heavy rain, affecting its use. Therefore, a steel cofferdam structure and installation method for shallow water areas is proposed. It should be noted that the above content is within the scope of the inventor's technical knowledge and does not necessarily constitute prior art. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a steel cofferdam structure and installation method for shallow water areas, which improves the waterproofing of the steel cofferdam during internal construction and facilitates waterproofing operations.

[0007] First aspect: To achieve the above objectives, the present invention provides the following technical solution: a shallow water area steel cofferdam structure, comprising a circular steel cofferdam, wherein an extension and retraction waterproof unit is installed on the upper outer wall of the circular steel cofferdam, the extension and retraction waterproof unit comprising a support ring installed on the outer wall of the circular steel cofferdam, two symmetrically distributed support sleeves fixedly connected to the upper surface of the support ring, multiple connecting rings rotatably connected to the outer walls of the two support sleeves, a fixed arc plate, a movable arc plate and multiple support arc plates fixedly connected between the corresponding connecting rings on the two support sleeves, the fixed arc plate being fixedly connected to the upper surface of the support ring, the multiple support arc plates being located between the fixed arc plate and the movable arc plate, a transmission air guiding unit connected to the connecting rings at both ends of the movable arc plate being installed on the inner wall of the support sleeve, two symmetrically distributed support plates being fixedly connected to the outer wall of the support ring, a motor being installed on the upper surface of the two support plates, the output shaft of the motor being connected to the transmission air guiding unit, the motor driving the movable arc plate to rotate through the transmission air guiding unit, and rainproof cloths being fixedly connected between the fixed arc plate and the adjacent support arc plate, between two adjacent support arc plates, and between the movable arc plate and the adjacent support arc plate.

[0008] Preferably, the waterproofing unit further includes clearance grooves formed on the side walls of the connecting rings at both ends of the multiple supporting arc plates, with a slider slidably connected in the clearance groove, and the slider being fixedly connected to the side wall of the adjacent connecting ring.

[0009] Preferably, the waterproofing unit further includes a sliding opening on the inner wall of the support sleeve and an air inlet at the end of the support sleeve. The transmission and air guiding unit includes a transmission rod rotatably connected to one end of the support sleeve and a transmission ring rotatably connected inside the support sleeve. An adjacent motor drives the transmission rod to rotate. A transmission block is fixedly connected to the outer wall of the transmission ring. The transmission block is slidably connected to the sliding opening. The transmission block is fixedly connected to the inner wall of the connecting ring at the end of the movable arc plate. The transmission rod passes through the transmission ring. A groove is opened on the outer wall of the transmission rod. An active block is slidably connected to the inner wall of the groove. A spring is fixedly connected to the inner wall of the groove. The other end of the spring is fixedly connected to one end of the active block. A passive block is fixedly connected to the inner wall of the transmission ring. The active block and the passive block correspond to each other. An arc angle is opened on one end of the active block. An inclined groove is opened on one side of the passive block. The transmission and air guiding units in the two support sleeves are distributed in opposite directions. Multiple air guide vanes are fixedly connected to the outer wall of the transmission rod.

[0010] Preferably, the transmission air guide unit further includes a limiting groove formed at the end of the transmission rod, and the output shaft of the motor is matched with the limiting groove and movably connected.

[0011] Preferably, the waterproofing unit further includes a shielding arc plate fixedly connected to the side wall of the fixed arc plate and the movable arc plate, with the two shielding arc plates corresponding to each other.

[0012] Preferably, the waterproof extension unit further includes heat dissipation holes on the fixed arc plate, the movable arc plate, and the support ring, with the heat dissipation holes on the support ring corresponding to the heat dissipation holes on the fixed arc plate and the movable arc plate.

[0013] Preferably, a first elastic rope and a second elastic rope are fixedly connected between the fixed arc plate and the adjacent supporting arc plate, between the two adjacent supporting arc plates and between the movable arc plate and the adjacent supporting arc plate. The first elastic rope is fixedly connected to the outer wall of the rainproof cloth at multiple points, and the second elastic rope is fixedly connected to the inner wall of the rainproof cloth at multiple points.

[0014] Preferably, the outer wall of the circular steel cofferdam is fixedly connected to an annular bracket, the support ring is movably sleeved on the outer wall of the circular steel cofferdam, the annular bracket supports the support ring, and the annular bracket is locked to the support ring by bolts.

[0015] Preferably, a lifting ring is fixedly connected to the periphery of the support ring, and multiple lifting rings are evenly distributed.

[0016] The second aspect: a method for installing a steel cofferdam in shallow water areas, the method comprising the following steps:

[0017] Step 1: First, install the circular steel cofferdam in the shallow water area. Then, use a floating crane with lifting rings to lift the waterproof unit outside the circular steel cofferdam, so that the support ring contacts the ring bracket. Lock the ring bracket to the support ring with bolts to complete the installation.

[0018] Step 2: When it rains, start one of the motors. The output shaft of this motor, in conjunction with the transmission and air guiding unit, drives the movable arc plate to rotate, causing the movable arc plate and multiple supporting arc plates to unfold. This allows the rainproof cloth to unfold and cover the upper end of the circular steel cofferdam with rain protection. When the rain stops, start the other motor. The output shaft of this motor, in conjunction with the transmission and air guiding unit, drives the movable arc plate to rotate back, causing the movable arc plate and multiple supporting arc plates to rotate above the fixed arc plate, thus storing the rainproof cloth.

[0019] Step 3: After the rainproof cloth is unfolded, start the two motors to reverse, so that the arc corner on the active block slides with the inclined groove on the passive block, driving the active block to slide into the groove, so that the transmission air guide unit will not drive the movable arc plate to retract. At this time, the transmission rod blows the outside air from the opening end of the support sleeve and the air inlet into the rainproof cloth and the circular steel embankment for heat dissipation through the outer wall fan blades on its outer wall, and the heat dissipation holes are used to exhaust the heat.

[0020] Beneficial effects

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This invention installs a retractable waterproof unit on the upper outer wall of a circular steel cofferdam. The motor in the retractable waterproof unit can drive a movable arc plate and multiple supporting arc plates to unfold, thereby expanding the rainproof cloth and covering the upper opening of the circular steel cofferdam to prevent rainwater from entering and affecting construction. When not in use, the movable plate and multiple supporting plates can be retracted, which will also cause the rainproof cloth to retract, thus not obstructing the upper end of the circle. The overall structure is simple, and it is convenient to unfold and retract the rainproof cloth. At the same time, it completely covers the upper opening of the circular steel cofferdam, providing better rain protection and improving practicality.

[0023] 2. This invention installs a transmission air guiding unit inside the support sleeve. Two motors drive the movable arc plate to unfold and retract through the transmission air guiding unit. By reversing the motor output shaft, when the rainproof cloth covers the circular steel cofferdam, it drives the transmission rod to rotate, causing the air guide blades on the outer wall of the transmission rod to rotate. This allows outside air to be introduced into the rainproof cloth and the circular steel cofferdam, dissipating heat and providing fresh air. This allows workers to carry out construction inside the circular steel cofferdam, ensuring the construction progress.

[0024] 3. The present invention fixes the first elastic rope and the second elastic rope to the outer wall and bottom surface of the rainproof cloth at multiple points, so that when the movable arc plate is unfolded, the first elastic rope and the second elastic rope will stretch to unfold the rainproof cloth. When the movable arc plate is retracted, the first elastic rope and the second elastic rope will contract to fold and store the rainproof cloth, thus avoiding the accumulation of the rainproof cloth from affecting storage or causing damage to the rainproof cloth.

[0025] 4. By creating a clearance groove on the connecting ring, when the movable arc plate rotates, the connecting ring at its end can drive the adjacent connecting ring to rotate through the slider, and the adjacent connecting ring can drive the connecting ring on its other side to rotate. This allows multiple supporting arc plates to rotate through the slider, preventing the supporting arc plates from putting tension on the rainproof cloth and avoiding damage when rotating.

[0026] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the unfolded waterproof unit of the present invention;

[0029] Figure 3 This is a structural schematic diagram of the fixed arc plate, movable arc plate, and supporting arc plate of the present invention;

[0030] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0031] Figure 5 A schematic diagram of the retractable waterproof unit of this invention;

[0032] Figure 6 A schematic diagram of the positional structure of the annular support of the present invention;

[0033] Figure 7 A schematic diagram of the structure of the fixed arc plate, the movable arc plate, and the rotating part supporting the arc plate of the present invention;

[0034] Figure 8 Schematic diagram of the internal structure of the support sleeve of the present invention;

[0035] Figure 9 A cross-sectional view of the support sleeve and a detailed structural schematic diagram of the transmission and air guiding unit of the present invention;

[0036] Figure 10 A cross-sectional structural schematic diagram of the support sleeve and transmission rod of the present invention;

[0037] Figure 11 for Figure 10 A magnified view of a section at point B in the middle;

[0038] Figure 12 A cross-section of the support sleeve and a schematic diagram of the outer wall of the transmission rod of the present invention;

[0039] Figure 13 A schematic diagram of the connection structure between the first elastic rope and the second elastic rope and the rainproof cloth of the present invention.

[0040] In the diagram: 1. Circular steel cofferdam; 2. Ring support; 3. Waterproofing unit for deployment and retraction; 31. Support ring; 32. Support sleeve; 33. Connecting ring; 34. Fixed arc plate; 35. Movable arc plate; 36. Support arc plate; 37. Support plate; 38. Motor; 39. Shielding arc plate; 310. Heat dissipation hole; 311. Air inlet; 312. Clearance groove; 313. Sliding block; 314. Sliding port; 4. Transmission air guiding unit; 41. Transmission rod; 42. Transmission ring; 43. Transmission block; 44. Passive block; 45. Slide groove; 46. Active block; 47. Spring; 48. Arc angle; 49. Inclined groove; 410. Exhaust fan blade; 411. Limiting groove; 5. Rainproof cloth; 6. First elastic rope; 7. Second elastic rope; 8. Lifting ring. Detailed Implementation

[0041] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1:

[0043] Please see Figure 1-13 The shallow water steel cofferdam structure of this embodiment includes a circular steel cofferdam 1. An extension and retraction waterproof unit 3 is installed on the upper outer wall of the circular steel cofferdam 1. The extension and retraction waterproof unit 3 includes a support ring 31 installed on the outer wall of the circular steel cofferdam 1. Two symmetrically distributed support sleeves 32 are fixedly connected to the upper surface of the support ring 31. Multiple connecting rings 33 are rotatably connected to the outer walls of both support sleeves 32. A fixed arc plate 34, a movable arc plate 35, and multiple support arc plates 36 are fixedly connected between the corresponding connecting rings 33 on the two support sleeves 32. The fixed arc plate 34 is fixedly connected to the upper surface of the support ring 31, and the multiple support arc plates 36 are located at... Between the fixed arc plate 34 and the movable arc plate 35, the inner wall of the support sleeve 32 is equipped with a transmission air guide unit 4 connected to the connecting rings 33 at both ends of the movable arc plate 35. The outer wall of the support ring 31 is fixedly connected to two symmetrically distributed support plates 37. The upper surface of each of the two support plates 37 is equipped with a motor 38. The output shaft of the motor 38 is connected to the transmission air guide unit 4. The motor 38 drives the movable arc plate 35 to rotate through the transmission air guide unit 4. Rainproof cloths 5 are fixedly connected between the fixed arc plate 34 and the adjacent support arc plate 36, between two adjacent support arc plates 36, and between the movable arc plate 35 and the adjacent support arc plate 36.

[0044] Specifically, the steel cofferdam structure in this invention is similar to existing steel cofferdam structures. The main improvement of this invention lies in enhancing the waterproofing during construction inside the steel cofferdam and facilitating waterproofing operations. When the circular steel cofferdam 1 is installed in a shallow water area and construction is carried out inside, if it rains, the motor 38 can be started. The output end of the motor 38 drives the connecting rings 33 at both ends of the movable arc plate 35 to rotate through the transmission air guide unit 4. The support sleeve 32 supports the connecting rings 33, and the connecting rings 33 drive the movable arc plate 35 to rotate. The movable arc plate 35 unfolds the rainproof cloth 5 between itself and the adjacent supporting arc plates 36, and with the rotation of the movable arc plate 35, multiple supporting arc plates 36... 6. Rotate until the movable arc plate 35 is parallel to the fixed arc plate 34. At this time, multiple rainproof cloths 5 are fully unfolded. The unfolded rainproof cloths 5 can completely cover the upper opening of the circular steel cofferdam 1, preventing rainwater from entering the circular steel cofferdam 1 and ensuring the construction quality of the circular steel cofferdam 1. After the rain stops, the movable arc plate 35 is rotated by the motor 38, which also drives the multiple supporting arc plates 36 to rotate, so that the multiple supporting arc plates 36 and the movable arc plate 35 are rotated above the fixed arc plate 34, thereby retracting the rainproof cloths 5. The overall structure is simple, making it convenient to unfold and retract the rainproof cloths 5. It is easy to use, has higher safety in rainy weather, better rain protection, and improves practicality.

[0045] The motor 38 mentioned above can be purchased from the market. It is a mature technology that has been fully disclosed, so it will not be repeated in the manual. The motor 38 is equipped with a power connection cable, and it is electrically connected to the external main controller and 220V phase voltage (or 380V line voltage) through the power connection cable. The main controller can be a conventional known device such as a computer that plays a control role.

[0046] The waterproof unit 3 also includes clearance grooves 312 formed on the side walls of the connecting rings 33 at both ends of the multiple supporting arc plates 36. A slider 313 is slidably connected in the clearance grooves 312, and the slider 313 is fixedly connected to the side wall of the adjacent connecting ring 33. When the connecting rings 33 at both ends of the movable arc plate 35 rotate, the connecting rings 33 drive the slider 313 to slide in the clearance grooves 312 on the adjacent connecting rings 33. After the rainproof cloth 5 between the movable arc plate 35 and the adjacent supporting arc plate 36 is unfolded, the slider 313 contacts the inner wall of the clearance groove 312. At this time, the connecting ring 33 drives the adjacent connecting ring 33 to rotate. Similarly, after the rainproof cloth 5 between two adjacent supporting arc plates 36 is unfolded, the slider 313 drives the adjacent connecting ring 33 to rotate. Thus, the rotation of the movable arc plate 35 can drive the multiple supporting arc plates 36 to rotate through the connection rings 33 and the slider 313, without pulling on the rainproof cloth 5, avoiding damage to the rainproof cloth 5, and improving practicality.

[0047] Specifically, the waterproof extension unit 3 also includes a sliding opening 314 on the inner wall of the support sleeve 32 and an air inlet 311 at the end of the support sleeve 32. The transmission and air guiding unit 4 includes a transmission rod 41 rotatably connected to one end of the support sleeve 32 and a transmission ring 42 rotatably connected inside the support sleeve 32. An adjacent motor 38 drives the transmission rod 41 to rotate. A transmission block 43 is fixedly connected to the outer wall of the transmission ring 42. The transmission block 43 is slidably connected to the sliding opening 314. The transmission block 43 is fixedly connected to the inner wall of the connecting ring 33 at the end of the movable arc plate 35. The transmission rod 41 passes through the transmission ring 42. The outer wall of the transmission rod 41 is provided with a sliding groove 45, the inner wall of the sliding groove 45 is slidably connected with an active block 46, the inner wall of the sliding groove 45 is fixedly connected with a spring 47, the other end of the spring 47 is fixedly connected with one end of the active block 46, the inner wall of the transmission ring 42 is fixedly connected with a passive block 44, the active block 46 corresponds to the passive block 44, one end of the active block 46 is provided with an arc angle 48, one side of the passive block 44 is provided with an inclined groove 49, the transmission air guiding units 4 in the two support sleeves 32 are distributed in opposite directions, and multiple air guide vanes 410 are fixedly connected to the outer wall of the transmission rod 41.

[0048] When the rainproof cloth 5 needs to be unfolded for rain protection, one of the motors 38 is started to rotate forward. The motor 38 drives the transmission rod 41 to rotate, and the transmission rod 41 drives the active block 46 to rotate. The active block 46 contacts the passive block 44. At this time, the arc angle 48 on the active block 46 moves away from the passive block 44, thereby driving the passive block 44 to rotate through the active block 46. The passive block 44 drives the transmission ring 42 to rotate, and the transmission ring 42 drives the transmission block 43 to rotate in the sliding opening 314. The transmission block 43 drives the connecting rings 33 at both ends of the movable arc plate 35 to rotate, thereby opening the rainproof cloth 5. When the rainproof cloth 5 needs to be closed, another motor 38 is started to rotate forward, which is the same as the first motor 38. This motor 38 can drive the connecting rings 33 at both ends of the movable arc plate 35 to rotate, so that the movable arc plate 35 rotates to retract the rainproof cloth 5. At the same time, after the rainproof cloth 5 is unfolded, the output shafts of both motors 38 are started to rotate in reverse, which drives the transmission rod 41 to rotate in reverse. This causes the arc angle 48 of the active block 46 on the outer wall of the transmission rod 41 to contact the inclined groove 49 on the passive block 44. The inclined groove 49 guides the active block 46 through the arc angle 48, causing the active block 46 to slide into the sliding groove 45. The active block 46 drives the spring 47 to compress until the active block 46 slides past the passive block 44. At this time, driven by the spring 47, the active block 46 moves outward again, which does not affect the rotation of the active block 46 and the passive block 44 when the motor 38 rotates forward.

[0049] When the two motors 38 reverse, they will not drive the connecting ring 33 to rotate, allowing the transmission rod 41 to rotate independently. The rotation of the transmission rod 41 drives the exhaust fan 410 on its outer wall to rotate. The exhaust fan 410 draws in outside air from the outer end opening of the support sleeve 32 and exhausts it from the air inlet 311 into the rainproof cloth 5 and the circular steel cofferdam 1. This dissipates heat from the circular steel cofferdam 1 and provides fresh air, ensuring the normal drying of the cement inside the circular steel cofferdam 1. The rainproof cloth 5 can be made of transparent material, allowing workers to work inside the circular steel cofferdam 1 even on rainy days, thus ensuring the progress of the project.

[0050] Specifically, the transmission air guide unit 4 also includes a limiting groove 411 opened at the end of the transmission rod 41. The output shaft of the motor 38 is matched with the limiting groove 411 and movably inserted. The output shaft of the motor 38 can be inserted into the limiting groove 411 first, and then installed on the support plate 37 by bolts or other means. When the output shaft of the motor 38 rotates, the rotation of the limiting groove 411 can drive the transmission rod 41 to rotate. The motor 38 can be disassembled for easy replacement and maintenance. At the same time, it can be disassembled and stored away when the weather is good to prevent theft.

[0051] The retractable waterproof unit 3 also includes a shielding arc plate 39 fixedly connected to the side walls of the fixed arc plate 34 and the movable arc plate 35, with two shielding arc plates 39 corresponding to each other; after the movable arc plate 35 and multiple supporting arc plates 36 are retracted, the shielding arc plate 39 on the movable arc plate 35 contacts the shielding arc plate 39 on the fixed arc plate 34, and the supporting arc plate 36 is located between the movable arc plate 35 and the fixed arc plate 34. The shielding arc plate 39 can hide and protect the rainproof cloth 5, preventing it from being exposed and damaged.

[0052] The waterproof unit 3 also includes heat dissipation holes 310 on the fixed arc plate 34, the movable arc plate 35 and the support ring 31. The heat dissipation holes 310 on the support ring 31 correspond to the heat dissipation holes 310 on the fixed arc plate 34 and the movable arc plate 35. The fan blades 410 deliver fresh air into the circular steel cofferdam 1, and the air in the circular steel cofferdam 1 is discharged from the heat dissipation holes 310, thereby improving the air circulation in the circular steel cofferdam 1 and ensuring air quality.

[0053] A first elastic rope 6 and a second elastic rope 7 are fixedly connected between the fixed arc plate 34 and the adjacent supporting arc plate 36, and between the two adjacent supporting arc plates 36 and the movable arc plate 35 and the adjacent supporting arc plate 36. The first elastic rope 6 is fixedly connected to the outer wall of the rainproof cloth 5 at multiple points, and the second elastic rope 7 is fixedly connected to the inner wall of the rainproof cloth 5 at multiple points. When the movable arc plate 35 is unfolded, the movable arc plate 35 and the supporting arc plate 36 can drive the multiple first elastic ropes 6 and the multiple second elastic ropes 7 to stretch, thereby unfolding the rainproof cloth 5. When the movable arc plate 35 and the supporting arc plate 36 are retracted, the multiple first elastic ropes 6 and the multiple second elastic ropes 7 can drive the rainproof cloth 5 to fold through their own elasticity, thereby retracting the rainproof cloth 5 and avoiding the accumulation of the rainproof cloth 5, which may affect storage or cause damage to the rainproof cloth 5.

[0054] The outer wall of the circular steel cofferdam 1 is fixedly connected with an annular bracket 2, and the support ring 31 is movably sleeved on the outer wall of the circular steel cofferdam 1. The annular bracket 2 supports the support ring 31, and the annular bracket 2 is locked to the support ring 31 by bolts. The support ring 31 is detachable, which facilitates assembly operations on the water and does not affect the installation of the circular steel cofferdam 1. At the same time, it can be installed according to the weather and environment. The annular bracket 2 supports the support ring 31 to ensure the stability of the support ring 31.

[0055] The support ring 31 is fixedly connected to the circumference of the lifting ring 8, and multiple lifting rings 8 are evenly distributed. When installing the retractable waterproof unit 3, the floating jack can be connected to the lifting ring 8 through steel wire to lift the retractable waterproof unit 3 for installation, which facilitates the disassembly and assembly of the retractable waterproof unit 3.

[0056] In this embodiment, the implementation steps are as follows: After the circular steel cofferdam 1 is installed in the shallow water area, construction is carried out inside. If it rains, one of the motors 38 rotates forward, driving the transmission rod 41 to rotate. The transmission rod 41 drives the active block 46 to rotate, and the active block 46 contacts the passive block 44. At this time, the arc angle 48 on the active block 46 moves away from the passive block 44, thereby driving the passive block 44 to rotate through the active block 46. The passive block 44 drives the transmission ring 42 to rotate, and the transmission ring 42 drives the transmission block 43 to rotate within the sliding opening 314. The transmission block 43 drives the connecting rings 33 at both ends of the movable arc plate 35 to rotate. The connecting rings 33 are connected to... By driving the slider 313 to slide within the clearance groove 312 on the adjacent connecting ring 33, after the rainproof cloth 5 between the movable arc plate 35 and the adjacent connecting ring 33 is unfolded, the slider 313 contacts the inner wall of the clearance groove 312. At this time, the connecting ring 33 drives the adjacent connecting ring 33 to rotate. Similarly, after the rainproof cloth 5 between two adjacent supporting arc plates 36 is unfolded, the slider 313 drives the adjacent connecting ring 33 to rotate, so that the movable arc plate 35 can rotate and drive the multiple supporting arc plates 36 to rotate through the connection ring 33 and the slider 313, thereby opening the rainproof cloth 5.

[0057] The unfolded rainproof cloth 5 can completely cover the upper opening of the circular steel cofferdam 1, preventing rainwater from entering the circular steel cofferdam 1 and ensuring the construction quality of the circular steel cofferdam 1. With the rainproof cloth 5 open, the output shafts of the two motors 38 can be reversed, thereby reversing the transmission rod 41. This causes the arc angle 48 of the active block 46 on the outer wall of the transmission rod 41 to contact the inclined groove 49 on the passive block 44. The inclined groove 49 guides the active block 46 through the arc angle 48, causing the active block 46 to slide into the sliding groove 45. The active block 46 drives the spring 47 to compress until the active block 46 slides past the passive block 44. At this time, driven by the spring 47, the active block 46 moves outward again, without affecting the motor 38's forward rotation of the active block 46. When the passive block 44 is rotated by motor 6, the connecting ring 33 will not be rotated when the two motors 38 are reversed, so the transmission rod 41 rotates independently. The rotation of the transmission rod 41 drives the air duct 410 on its outer wall to rotate. The air duct 410 introduces outside air from the outer end opening of the support sleeve 32 and discharges it from the air inlet 311 into the rainproof cloth 5 and the circular steel dam 1, which dissipates heat and provides fresh air to the circular steel dam 1. The air in the circular steel dam 1 is discharged from the heat dissipation hole 310. After the rain stops, the other motor 38 is started to rotate forward, which is the same as the other first motor 38. This motor 38 can drive the connecting rings 33 at both ends of the movable arc plate 35 to rotate, so that the movable arc plate 35 can rotate and the rainproof cloth 5 can be retracted.

[0058] Example 2:

[0059] The installation method of the steel cofferdam in shallow water area in this embodiment includes the following steps:

[0060] Step 1: First, install the circular steel cofferdam 1 in the shallow water area. Then, use a floating crane with lifting ring 8 to hoist the waterproof unit 3 outside the circular steel cofferdam 1, so that the support ring 31 contacts the ring bracket 2. Lock the ring bracket 2 and support ring 31 with bolts to complete the installation.

[0061] Step 2: When it rains, start one of the motors 38. The output shaft of the motor 38, in conjunction with the transmission air guide unit 4, drives the movable arc plate 35 to rotate, causing the movable arc plate 35 and multiple supporting arc plates 36 to unfold, thereby unfolding the rainproof cloth 5 to cover the upper end of the circular steel cofferdam 1 for rain protection. When the rain stops, start the other motor 38. The output shaft of the motor 38, in conjunction with the transmission air guide unit 4, drives the movable arc plate 35 to rotate, causing the movable arc plate 35 and multiple supporting arc plates 36 to rotate above the fixed arc plate 34, and to store the rainproof cloth 5.

[0062] Step 3: After the rainproof cloth 5 is unfolded, start the two motors 38 to reverse, so that the arc angle 48 on the active block 46 slides with the inclined groove 49 on the passive block 44, driving the active block 46 to slide into the sliding groove 45, so that the transmission air guide unit 4 will not drive the movable arc plate 35 to retract. At this time, the transmission rod 41 blows the outside air from the opening end of the support sleeve 32 and the air inlet 311 into the rainproof cloth 5 and the circular steel cofferdam 1 for heat dissipation through the outer wall fan blade 410 on its outer wall, and the heat is discharged in conjunction with the heat dissipation hole 310.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A steel cofferdam structure for shallow water areas, comprising a circular steel cofferdam (1), characterized in that, A retractable waterproof unit (3) is installed on the upper outer wall of a circular steel cofferdam (1). The retractable waterproof unit (3) includes a support ring (31) installed on the outer wall of the circular steel cofferdam (1). Two symmetrically distributed support sleeves (32) are fixedly connected to the upper surface of the support ring (31). Multiple connecting rings (33) are rotatably connected to the outer walls of the two support sleeves (32). A fixed arc plate (34), a movable arc plate (35), and multiple support arc plates (36) are fixedly connected between the corresponding connecting rings (33) on the two support sleeves (32). The fixed arc plate (34) is fixedly connected to the upper surface of the support ring (31). Multiple support arc plates (36) are located between the fixed arc plate (34) and the movable arc plate (35). The inner wall of the support sleeve (32) is installed with the movable arc plate (36). 35) The transmission air guide unit (4) is connected to the connecting rings (33) at both ends. The outer wall of the support ring (31) is fixedly connected to two symmetrically distributed support plates (37). The upper surface of the two support plates (37) is equipped with motors (38). The output shaft of the motors (38) is connected to the transmission air guide unit (4). The motors (38) drive the movable arc plate (35) to rotate through the transmission air guide unit (4). The fixed arc plate (34) and the adjacent support arc plate (36), the two adjacent support arc plates (36) and the movable arc plate (35) and the adjacent support arc plate (36) are all fixedly connected with rainproof cloth (5). The unfolding and retracting waterproof unit (3) also includes clearance grooves (312) opened on the side wall of the connecting rings (33) at both ends of the multiple support arc plates (36). A slider (313) is slidably connected in the relief groove (312), and the slider (313) is fixedly connected to the side wall of the adjacent connecting ring (33); the retractable waterproof unit (3) also includes a sliding opening (314) opened on the inner wall of the support sleeve (32) and an air inlet (311) opened at the end of the support sleeve (32); the transmission air guiding unit (4) includes a transmission rod (41) rotatably connected to one end of the support sleeve (32) and a transmission ring (42) rotatably connected in the support sleeve (32); the adjacent motor (38) drives the transmission rod (41) to rotate; a transmission block (43) is fixedly connected to the outer wall of the transmission ring (42); the transmission block (43) is slidably connected to the sliding opening (314); and the transmission block (43) is connected to the inner wall of the connecting ring (33) at the end of the movable arc plate (35). The transmission rod (41) is fixedly connected to the transmission ring (42). The outer wall of the transmission rod (41) is provided with a groove (45). The inner wall of the groove (45) is slidably connected with an active block (46). The inner wall of the groove (45) is fixedly connected with a spring (47). The other end of the spring (47) is fixedly connected with one end of the active block (46). The inner wall of the transmission ring (42) is fixedly connected with a passive block (44). The active block (46) corresponds to the passive block (44). One end of the active block (46) is provided with an arc angle (48). One side of the passive block (44) is provided with an inclined groove (49). The transmission air guiding units (4) in the two support sleeves (32) are distributed in opposite directions. The outer wall of the transmission rod (41) is fixedly connected with multiple air guide vanes (410).

2. The shallow water steel cofferdam structure according to claim 1, characterized in that, The transmission air guide unit (4) also includes a limiting groove (411) opened at the end of the transmission rod (41), and the output shaft of the motor (38) matches and is movably connected to the limiting groove (411).

3. A shallow water steel cofferdam structure according to claim 2, characterized in that, The waterproof unit (3) also includes a shielding arc plate (39) fixedly connected to the side wall of the fixed arc plate (34) and the movable arc plate (35), with the two shielding arc plates (39) corresponding to each other.

4. A shallow water steel cofferdam structure according to claim 2, characterized in that, The waterproof unit (3) also includes heat dissipation holes (310) on the fixed arc plate (34), the movable arc plate (35) and the support ring (31), with the heat dissipation holes (310) on the support ring (31) corresponding to the heat dissipation holes (310) on the fixed arc plate (34) and the movable arc plate (35).

5. A shallow water steel cofferdam structure according to claim 1, characterized in that, A first elastic rope (6) and a second elastic rope (7) are fixedly connected between the fixed arc plate (34) and the adjacent supporting arc plate (36), and between the two adjacent supporting arc plates (36) and the movable arc plate (35) and the adjacent supporting arc plate (36). The first elastic rope (6) is fixedly connected to the outer wall of the rainproof cloth (5) at multiple points, and the second elastic rope (7) is fixedly connected to the inner wall of the rainproof cloth (5) at multiple points.

6. A shallow water steel cofferdam structure according to claim 1, characterized in that, The outer wall of the circular steel cofferdam (1) is fixedly connected with an annular bracket (2), and the support ring (31) is movably sleeved on the outer wall of the circular steel cofferdam (1). The annular bracket (2) supports the support ring (31), and the annular bracket (2) is locked to the support ring (31) by bolts.

7. A shallow water steel cofferdam structure according to claim 6, characterized in that, The support ring (31) is fixedly connected to the circumference of the lifting ring (8), and multiple lifting rings (8) are evenly distributed.

8. A method for installing a steel cofferdam in shallow water, characterized in that, The installation method for the shallow water steel cofferdam structure, including any one of claims 1-7, comprises the following steps: Step 1: First, install the circular steel cofferdam (1) in the shallow water area, and then use a floating crane with a lifting ring (8) to hoist the waterproof unit (3) outside the circular steel cofferdam (1), so that the support ring (31) contacts the ring bracket (2), and use bolts to lock the ring bracket (2) and the support ring (31) to complete the installation. Step 2: When it rains, start one of the motors (38). The output shaft of the motor (38) works with the transmission air guide unit (4) to drive the movable arc plate (35) to rotate, so that the movable arc plate (35) and multiple supporting arc plates (36) unfold, thereby unfolding the rainproof cloth (5) to cover the upper end of the circular steel cofferdam (1) for rain protection; when the rain stops, start another motor (38). The output shaft of the motor (38) works with the transmission air guide unit (4) to drive the movable arc plate (35) to rotate, so that the movable arc plate (35) and multiple supporting arc plates (36) rotate to the top of the fixed arc plate (34) to store the rainproof cloth (5); Step 3: After the rainproof cloth (5) is unfolded, start the two motors (38) to reverse, so that the arc corner (48) on the active block (46) slides with the inclined groove (49) on the passive block (44), driving the active block (46) to slide into the sliding groove (45), so that the transmission air guiding unit (4) will not drive the movable arc plate (35) to retract. At this time, the transmission rod (41) blows the outside air from the opening end of the support sleeve (32) and the air inlet (311) into the rainproof cloth (5) and the circular steel dam (1) for heat dissipation through the outer wall air guide vane (410) on its outer wall, and cooperates with the heat dissipation hole (310) to discharge the heat.

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