Cofferdam structure and construction method thereof

Abstract

The application belongs to the technical field of cofferdam construction, and particularly relates to a cofferdam structure and a construction method thereof. The cofferdam structure comprises a cofferdam mechanism and a pile column. A reinforcing mechanism is arranged on the cofferdam mechanism. A grouting pipe is arranged below the reinforcing mechanism. The grouting pipe is used for generating a sealing base through mud grouting. The cofferdam mechanism comprises a mounting column one which is fixedly connected to the top of the pile column. The cofferdam structure and the construction method thereof enable the mounting column one, the mounting column two and the pile column to be stably inserted into the lathe, and the outer plate and the inner plate can be stably inserted into the side grooves of the mounting column one and the mounting column two. The filling of the reinforcing layer effectively ensures the stability of the outer plate and improves the sealing property of the outer plate. Meanwhile, the grouting pipe generates the sealing base through grouting, which can further improve the sealing property of the cofferdam, prevent the cofferdam structure from gradually accumulating water and ensure the stable construction of the engineering in the cofferdam structure.

Description

Technical Field

[0001] This invention relates to the field of cofferdam construction technology, specifically to a cofferdam structure and its construction method. Background Technology

[0002] A cofferdam is a temporary retaining structure built in water conservancy projects to construct permanent water conservancy facilities. Its function is to prevent water and soil from entering the construction site of the building, so as to facilitate drainage, excavation of foundation pits, and construction of buildings within the cofferdam.

[0003] Currently, in the prior art, for example, Chinese patent with publication number CN 115949082 B discloses a cofferdam structure and its construction method. This device provides support for the outer cofferdam structure by using main load-bearing piles and inner water-retaining plates, so that they can jointly block the impact of water flow, thereby improving the impact resistance of the outer cofferdam structure, thus ensuring the safety of subsequent construction and further improving construction safety.

[0004] However, in actual use, due to the impact of water flow, the bottom of the outer weir structure is not well sealed under the impact, and water flow can enter the cofferdam structure through the bottom of the outer weir structure, causing water to gradually accumulate in the cofferdam structure and affecting the construction of the cofferdam structure. Summary of the Invention

[0005] The main objective of this invention is to provide a cofferdam structure and its construction method, which can solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention proposes the following technical solution:

[0007] A cofferdam structure includes a cofferdam mechanism and piles. A reinforcement mechanism is provided on the cofferdam mechanism, and a grouting pipe is located below the reinforcement mechanism. The grouting pipe is used for mud injection to generate a sealed base. The cofferdam mechanism includes:

[0008] Mounting column one, which is fixedly connected to the top of the pile column;

[0009] Mounting column two, wherein an outer plate and an inner plate are slidably connected in the side groove on the side wall of mounting column one;

[0010] The reinforcement layer is composed of sand and gravel and is filled between the outer plate and the inner plate. The reinforcement mechanism includes a positioning component, which is fixedly installed on the second mounting column by bolts. The positioning component is detachably connected to a reinforcing steel column. The two ends of the reinforcing steel column are provided with fixing components, and the outer wall of the reinforcing steel column is provided with a reinforcement component.

[0011] Preferably, the thickness of the middle part of the inner plate is less than the thickness of the two sides of the inner plate, and an installation opening is provided on the outer wall of the second mounting column.

[0012] Preferably, the positioning component includes a mounting base, which is detachably connected to the mounting opening by bolts. A support block is fixedly connected to the outer wall of the mounting base, and a slot is formed on the inner surface of the support block. Through the use of the support block, the reinforcing steel column can be supported and positioned, which facilitates the installation of the reinforcing steel column.

[0013] Preferably, the fixing component includes a groove formed on the upper side of the reinforcing steel column. A slider is slidably connected in the groove, and an elastic telescopic rod is embedded in the slider. The slider and the groove are elastically connected by a compression spring. A locking block is fixedly connected to the side of the slider away from the compression spring. The locking block engages with a locking groove. A pull handle is fixedly connected to the telescopic end of the elastic telescopic rod. By holding the pull handle, the slider is pulled to slide in the groove, allowing the locking block to disengage from the locking groove, facilitating the subsequent removal of the reinforcing steel column.

[0014] Preferably, a limiting rod is fixedly connected to the outer wall of the reinforcing steel column. Two sets of limiting rods are provided, and the distance between the two sets of limiting rods is less than the length of the pull handle. By using the limiting rods, the pull handle can be limited, so that when the worker removes the reinforcing steel column, after the locking block disengages from the locking groove and the pull handle passes through the limiting rod, the pull handle can be gradually released, and the telescopic end of the elastic telescopic rod will reset, so that the limiting rod locks the pull handle and prevents the slider from resetting under the action of the compression spring.

[0015] Preferably, the reinforcement component includes a connecting rod hinged to the outer wall of the reinforcing steel column. An auxiliary support plate is hinged to the end of the connecting rod away from the reinforcing steel column. An elastic telescopic member is provided on the auxiliary support plate. A block is fixedly connected to the end of the elastic telescopic member away from the auxiliary support plate. A hinge rod is hinged to the outer wall of the block. A groove is formed on the outer wall of the hinge rod. A round rod is slidably connected in the groove. The round rod is fixedly connected to the outer wall of the support rod. The support rod is fixedly connected to the outer wall of the auxiliary support plate. A pressure block is hinged to the end of the hinge rod away from the block.

[0016] Preferably, the auxiliary support plate has a notch on the side away from the connecting rod, and a movable plate is slidably connected in the notch.

[0017] Preferably, an inner rod is fixedly connected to the side of the movable plate near the connecting rod. A sleeve rod is sleeved on the outer wall of the inner rod. The sleeve rod is fixedly connected to the outer wall of the auxiliary support plate. A slip ring is fixedly connected to the outer wall of the inner rod. The slip ring is slidably connected to the inner wall of the sleeve rod. A pressure sensor is fixedly connected to the inner wall of the sleeve rod. The slip ring and the pressure sensor are elastically connected by a connecting spring. When deformation occurs in the middle of the inner plate, the movable plate slides in the recess, causing the inner rod to move the slip ring, compressing the connecting spring. The pressure sensor detects a change in pressure reading, thereby warning the workers that the inner plate has begun to deform and that the pressure it is subjected to exceeds the inner plate's bearing capacity. This alerts the workers to move away from the cofferdam and to reinforce the cofferdam. Furthermore, during the movement of the inner rod, the hinge rod moves, and the round rod slides in the sliding groove, causing the pressure block to abut against the inner plate, applying a supporting force to the inner plate and achieving the effect of reinforcing the inner plate.

[0018] Preferably, the middle of the installation column is provided with a grouting channel, and the inside of the pile column is provided with an inner groove, a through-hole, and a limiting groove. The inner groove is connected to the grouting channel, and the through-hole is connected to the inner groove. A ring is slidably connected in the inner groove, and a stop block is fixedly connected to the bottom of the ring. The stop block is slidably connected in the limiting groove. The ring and the inner groove are elastically connected by a support spring. Mud is injected through the grouting channel. The mud squeezes the ring, and the ring compresses the support spring, causing the ring to move downward and disengage from the through-hole. The mud enters the gap between the pile column and the riverbed soil through the through-hole, thus reinforcing the pile column.

[0019] This invention proposes a construction method for a cofferdam structure, comprising the following steps:

[0020] S1. First, use a crane to insert the first installation column, the second installation column, and the pile into the riverbed. After the first installation column, the second installation column, and the pile are fixed and stable, insert the outer plate and the inner plate into the side grooves of the first installation column and the second installation column.

[0021] S2. Next, fill the reinforcement layer between the outer panel and the inner panel. After the reinforcement layer is filled, connect the mounting base to the mounting opening in a detachable manner with bolts. Then install the reinforcing steel column in the mounting base to reinforce and support the inner panel.

[0022] S3. Next, hinge the connecting rod to the outer wall of the reinforcing steel column, then fix the auxiliary support plate to the middle of the inner plate with bolts, and then pump out the water in the cofferdam.

[0023] S4. Then insert the grouting pipe into the bottom of the riverbed and grout the grouting pipe to generate a sealed base.

[0024] S5. Then, the mud is injected through the grouting channel. The mud squeezes the ring, and the ring compresses the support spring, causing the ring to move downwards and break free from the obstruction of the opening. The mud then enters the gap between the pile and the riverbed soil through the opening, reinforcing the pile.

[0025] This invention provides a cofferdam structure and its construction method. It has the following beneficial effects:

[0026] (1) By using the cofferdam mechanism, piles, grouting pipes and sealing base, the first installation column, the second installation column and the piles can be stably inserted into the lathe, and the outer plate and the inner plate can be stably inserted into the side grooves of the first installation column and the second installation column. Then, by filling the reinforcement layer, the stability of the outer plate is effectively guaranteed and the sealing performance of the outer plate is improved. At the same time, the grouting of the grouting pipe to generate a sealing base can further improve the sealing performance of the cofferdam, prevent water from gradually accumulating in the cofferdam structure, and ensure the stable construction of the project in the cofferdam structure.

[0027] (2) By using the reinforcement mechanism, the inner plate can be reinforced, the strength of the cofferdam structure can be improved, and the reinforcement steel column can be directly installed in the mounting base when it is installed. The installation is very convenient, and the subsequent removal of the reinforcement steel column is also relatively easy, reducing the workload.

[0028] (3) By using the reinforcement components, when the middle of the inner plate deforms, the moving plate slides in the notch, causing the inner rod to move the slip ring, compressing the connecting spring, and the pressure sensor detects the change in pressure reading, thereby warning the staff that the inner plate has begun to deform and that the pressure it receives exceeds the inner plate's bearing capacity, thus reminding the staff to stay away from the cofferdam and reinforce the cofferdam. In addition, during the movement of the inner rod, the hinge rod moves, and the round rod slides in the groove, causing the pressure block to abut against the inner plate and apply a supporting force to the inner plate, thereby achieving the effect of reinforcing the inner plate.

[0029] (4) By injecting mud into the grouting channel, the mud squeezes the ring, the ring compresses the support spring, and the ring drives the stop block to move downward to get away from the obstruction of the opening. The mud enters the gap between the pile and the riverbed soil through the opening, which strengthens the pile and further improves the strength of the cofferdam structure. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the overall three-dimensional structure of Embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of the reinforcement mechanism structure according to Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the positioning component structure according to Embodiment 1 of the present invention;

[0034] Figure 4 This is a schematic cross-sectional view of the fixing component and the reinforcing steel column according to Embodiment 1 of the present invention;

[0035] Figure 5 For the present invention Figure 2 Schematic diagram of structure A in the middle;

[0036] Figure 6 This is a schematic diagram of the installation column 2 and pile structure in Embodiment 1 of the present invention;

[0037] Figure 7 This is a cross-sectional view of the reinforcement component according to Embodiment 2 of the present invention;

[0038] Figure 8 For the present invention Figure 7 Schematic diagram of structure B in the middle;

[0039] Figure 9 This is a schematic diagram of the cross-sectional structure of the installation column and the pile column in Embodiment 3 of the present invention;

[0040] Figure 10 For the present invention Figure 9 Schematic diagram of the C-structure.

[0041] In the diagram: 1. Cofferdam structure; 2. Pile column; 3. Reinforcement mechanism; 4. Grouting pipe; 5. Sealing base; 101. Mounting column one; 102. Mounting column two; 103. Outer plate; 104. Inner plate; 105. Reinforcement layer; 1011. Grouting channel; 1021. Mounting port; 21. Inner groove; 22. Through opening; 23. Limiting groove; 24. Ring; 25. Stop block; 31. Positioning component; 32. Reinforcing steel column; 33. Fixing component; 34. Reinforcement component; 311. Mounting seat; 312. Support block; 3 13. Slot; 321. Limiting rod; 331. Groove; 332. Slider; 333. Locking block; 334. Elastic telescopic rod; 335. Pull handle; 341. Connecting rod; 342. Auxiliary support plate; 343. Elastic telescopic component; 344. Block; 345. Hinge rod; 346. Slide groove; 347. Round rod; 348. Support rod; 349. Pressure block; 3421. Notch; 3422. Moving plate; 3431. Sleeve rod; 3432. Inner rod; 3433. Slip ring; 3434. Pressure sensor.

[0042] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] 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.

[0044] Example 1: Please refer to Figures 1-6 The present invention proposes a cofferdam structure, including a cofferdam mechanism 1 and piles 2. A reinforcement mechanism 3 is provided on the cofferdam mechanism 1, and a grouting pipe 4 is provided below the reinforcement mechanism 3. The grouting pipe 4 is used for mud injection to generate a sealed base 5.

[0045] In an embodiment of the present invention, to achieve the assembly of the cofferdam mechanism 1, specifically, the cofferdam mechanism 1 includes a first mounting column 101, a second mounting column 102, and a reinforcing layer 105. The first mounting column 101 is fixedly connected to the top of the pile column 2. The second mounting column 102 and the side groove on the side wall of the first mounting column 101 are slidably connected to an outer plate 103 and an inner plate 104. The reinforcing layer 105 is composed of sand and gravel and is filled between the outer plate 103 and the inner plate 104. By mounting the first mounting column 101... 01. Both the second installation column 102 and the pile 2 are inserted into the riverbed. After the first installation column 101, the second installation column 102 and the pile 2 are fixed and stable, the outer plate 103 and the inner plate 104 are inserted into the side grooves of the first installation column 101 and the second installation column 102. Then, the reinforcement layer 105 is filled between the outer plate 103 and the inner plate 104 to complete the assembly of the cofferdam mechanism 1. After the water in the cofferdam is pumped out, the grouting pipe 4 is inserted into the bottom of the riverbed and grouting is performed on the grouting pipe 4 to generate a sealed base 5.

[0046] Furthermore, in order to reinforce the cofferdam mechanism 1, specifically, the reinforcement mechanism 3 includes a positioning component 31, which is fixedly installed on the second mounting column 102 by bolts. The positioning component 31 is detachably connected to a reinforcing steel column 32, and fixing components 33 are provided at both ends of the reinforcing steel column 32. Reinforcing components 34 are provided on the outer wall of the reinforcing steel column 32. The positioning component 31 includes a mounting base 311, and an installation opening 1021 is opened on the outer wall of the second mounting column 102. The mounting base 311 is detachably connected to the installation opening by bolts. In 1021, a support block 312 is fixedly connected to the outer wall of the mounting base 311. A slot 313 is formed on the inner surface of the support block 312. The fixing component 33 includes a groove 331, which is formed on the upper side of the reinforcing steel column 32. A slider 332 is slidably connected in the groove 331. An elastic telescopic rod 334 is embedded in the slider 332. The slider 332 and the groove 331 are elastically connected by a compression spring. A locking block 333 is fixedly connected to the side of the slider 332 away from the compression spring. The locking block 333 engages with the slot 313. The telescopic end of the elastic telescopic rod 334 is fixedly connected to a pull handle 335. A limit rod 321 is fixedly connected to the outer wall of the reinforcing steel column 32. Two sets of limit rods 321 are provided, and the distance between the two sets of limit rods 321 is less than the length of the pull handle 335. After the mounting base 311 is installed in the mounting opening 1021, the reinforcing steel column 32 is then installed on the support block 312. During this process, the locking block 333 compresses the compression spring. Then, after the locking block 333 aligns with the locking groove 313, under the reset action of the compression spring, the locking block 333... The 3-slot is inserted into the slot 313 to fix the reinforcing steel column 32. At the same time, when the staff removes the reinforcing steel column 32, they can pull the slider 332 in the groove 331 by holding the pull handle 335, so that the locking block 333 is disengaged from the slot 313. After the pull handle 335 passes the limit rod 321, the pull handle 335 is gradually released, and the telescopic end of the elastic telescopic rod 334 is reset, so that the limit rod 321 locks the pull handle 335, preventing the slider 332 from being reset under the action of the compression spring, so that the reinforcing steel column 32 can be removed easily and stably.

[0047] Furthermore, to reinforce the inner plate 104, the reinforcement component 34 specifically includes a connecting rod 341, which is hinged to the outer wall of the reinforcing steel column 32. An auxiliary support plate 342 is hinged to the end of the connecting rod 341 away from the reinforcing steel column 32. An elastic telescopic member 343 is provided on the auxiliary support plate 342. A block 344 is fixedly connected to the end of the elastic telescopic member 343 away from the auxiliary support plate 342. A hinge rod 345 is hinged to the outer wall of the block 344. A groove 346 is provided on the outer wall of the rod 345, and a round rod 347 is slidably connected in the groove 346. The round rod 347 is fixedly connected to the outer wall of the support rod 348, and the support rod 348 is fixedly connected to the outer wall of the auxiliary support plate 342. A pressure block 349 is hinged to the end of the hinge rod 345 away from the block 344. The auxiliary support plate 342 is fixed to the middle of the inner plate 104 by bolts. Under the action of the connecting rod 341, the auxiliary support plate 342 can reinforce the inner plate 104.

[0048] Example 2: Please refer to Figures 7-8 Based on Embodiment 1, the elastic telescopic component 343 is composed of an inner rod 3432, a sleeve rod 3431, a slip ring 3433, and a connecting spring. Specifically, the inner rod 3432 is fixedly connected to the side of the moving plate 3422 near the connecting rod 341. The sleeve rod 3431 is sleeved on the outer wall of the inner rod 3432 and fixedly connected to the outer wall of the auxiliary support plate 342. The slip ring 3433 is fixedly connected to the outer wall of the inner rod 3432 and slidably connected to the inner wall of the sleeve rod 3431. A pressure sensor 3434 is fixedly connected to the inner wall of the sleeve rod 3431. The slip ring 3433 and the pressure sensor 3434 are elastically connected by a connecting spring. A notch 3421 is provided on the side of the auxiliary support plate 342 away from the connecting rod 341. The sliding connection 1 includes a movable plate 3422. The thickness of the middle part of the inner plate 104 is less than the thickness of the two sides of the inner plate 104. When the middle part of the inner plate 104 deforms, the movable plate 3422 slides in the notch 3421, causing the inner rod 3432 to drive the slip ring 3433 to move, compressing the connecting spring. The pressure sensor 3434 senses the change in pressure reading, thereby warning the staff that the inner plate 104 has begun to deform and that the pressure it is subjected to exceeds the bearing capacity of the inner plate 104. This reminds the staff to stay away from the cofferdam and to reinforce the cofferdam. In addition, during the movement of the inner rod 3432, the hinge rod 345 moves, and the round rod 347 slides in the slide groove 346, causing the pressure block 349 to abut against the inner plate 104, applying a supporting force to the inner plate 104, thereby achieving the effect of reinforcing the inner plate 104.

[0049] Example 3: Please refer to Figures 9-10Based on Embodiment 1, a grouting channel 1011 is provided in the middle of the installation column 101. The inside of the pile column 2 is provided with an inner groove 21, an opening 22 and a limiting groove 23. The inner groove 21 is connected to the grouting channel 1011, and the opening 22 is connected to the inner groove 21. A ring 24 is slidably connected in the inner groove 21. A stop block 25 is fixedly connected to the bottom of the ring 24. The stop block 25 is slidably connected in the limiting groove 23. The ring 24 and the inner groove 21 are elastically connected by a support spring. By injecting mud into the grouting channel 1011, the mud squeezes the ring 24, and the ring 24 compresses the support spring, causing the ring 24 to drive the stop block 25 to move downward and disengage from the opening 22. The mud enters the gap between the pile column 2 and the riverbed soil through the opening 22, reinforcing the pile column 2 and further improving the strength of the cofferdam structure.

[0050] It should be noted that the above electrical components are all existing technology products. They are selected, installed and debugged by those skilled in the art according to the needs of use to ensure that all electrical appliances can work normally. The components are all general standard parts or components known to those skilled in the art. Their structure and principle can be known by those skilled in the art through technical manuals or conventional experimental methods. The applicant does not impose any specific restrictions here.

[0051] The present invention also provides a construction method for a cofferdam structure, comprising the following steps:

[0052] S1. First, use a crane to insert the first installation column 101, the second installation column 102 and the pile 2 into the riverbed. After the first installation column 101, the second installation column 102 and the pile 2 are fixed and stable, insert the outer plate 103 and the inner plate 104 into the side grooves of the first installation column 101 and the second installation column 102.

[0053] S2. Then fill the reinforcing layer 105 between the outer plate 103 and the inner plate 104. After the reinforcing layer 105 is filled, the mounting base 311 is detachably connected to the mounting port 1021 by bolts. Then install the reinforcing steel column 32 in the mounting base 311 to reinforce and support the inner plate 104.

[0054] S3. Then, hinge the connecting rod 341 to the outer wall of the reinforcing steel column 32, then fix the auxiliary support plate 342 to the middle of the inner plate 104 with bolts, and then pump out the water in the cofferdam.

[0055] S4. Then insert the grouting pipe 4 into the bottom of the riverbed, and then grout the grouting pipe 4 to generate a sealed base 5.

[0056] S5. Then, the mud is injected through the grouting channel 1011. The mud squeezes the ring 24, and the ring 24 compresses the support spring, causing the ring 24 to drive the stop block 25 to move downward and break away from the obstruction of the opening 22. The mud enters the gap between the pile 2 and the riverbed soil through the opening 22 to reinforce the pile 2.

[0057] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A cofferdam structure comprising a cofferdam mechanism (1) and a pile (2), characterized in that: The cofferdam mechanism (1) is equipped with a reinforcement mechanism (3), and a grouting pipe (4) is provided below the reinforcement mechanism (3). The grouting pipe (4) is used for mud injection to generate a sealing base (5). The cofferdam mechanism (1) includes: Mounting column one (101), which is fixedly connected to the top of the pile column (2); Mounting post two (102), the outer plate (103) and the inner plate (104) are slidably connected in the side groove on the side wall of mounting post two (102) and mounting post one (101). The reinforcement layer (105) is composed of sand and gravel and is filled between the outer plate (103) and the inner plate (104). The reinforcement mechanism (3) includes a positioning component (31), which is fixedly installed on the second mounting column (102) by bolts. The positioning component (31) is detachably connected to a reinforcing steel column (32). The two ends of the reinforcing steel column (32) are provided with fixing components (33), and the outer wall of the reinforcing steel column (32) is provided with a reinforcement component (34). The reinforcement component (34) includes a connecting rod (341) hinged to the outer wall of the reinforcing steel column (32). An auxiliary support plate (342) is hinged to the end of the connecting rod (341) away from the reinforcing steel column (32). An elastic telescopic member (343) is provided on the auxiliary support plate (342). A block (344) is fixedly connected to the end of the elastic telescopic member (343) away from the auxiliary support plate (342). 4) The outer wall is hinged with a hinge rod (345), and a sliding groove (346) is provided on the outer wall of the hinge rod (345). A round rod (347) is slidably connected in the sliding groove (346). The round rod (347) is fixedly connected to the outer wall of the support rod (348). The support rod (348) is fixedly connected to the outer wall of the auxiliary support plate (342). A pressure block (349) is hinged to the end of the hinge rod (345) away from the block (344). A grouting channel (1011) is provided in the middle of the installation column (101). The inside of the pile column (2) is provided with an inner groove (21), a through-hole (22) and a limiting groove (23). The inner groove (21) is connected to the grouting channel (1011), and the through-hole (22) is connected to the inner groove (21). A ring (24) is slidably connected in the inner groove (21). A stop block (25) is fixedly connected to the bottom of the ring (24). The stop block (25) is slidably connected in the limiting groove (23). The ring (24) and the inner groove (21) are elastically connected by a support spring.

2. The cofferdam structure of claim 1, wherein: The thickness of the middle part of the inner plate (104) is less than the thickness of the two sides of the inner plate (104), and the mounting port (1021) is provided on the outer wall of the mounting column (102).

3. The cofferdam structure of claim 2, wherein: The positioning component (31) includes a mounting base (311), which is detachably connected to the mounting port (1021) by bolts. A support block (312) is fixedly connected to the outer wall of the mounting base (311), and a slot (313) is provided on the inner surface of the support block (312).

4. The cofferdam structure of claim 3, wherein: The fixing component (33) includes a groove (331) which is formed on the upper side of the reinforcing steel column (32). A slider (332) is slidably connected in the groove (331). An elastic telescopic rod (334) is embedded in the slider (332). The slider (332) and the groove (331) are elastically connected by a compression spring. A locking block (333) is fixedly connected to the side of the slider (332) away from the compression spring. The locking block (333) engages with the locking groove (313). A pull handle (335) is fixedly connected to the telescopic end of the elastic telescopic rod (334).

5. The cofferdam structure of claim 4, wherein: Limiting rods (321) are fixedly connected to the outer wall of the reinforcing steel column (32). Two sets of limiting rods (321) are provided, and the distance between the two sets of limiting rods (321) is less than the length of the pull handle (335).

6. The cofferdam structure of claim 1, wherein: The auxiliary support plate (342) has a notch (3421) on the side away from the connecting rod (341), and a movable plate (3422) is slidably connected in the notch (3421).

7. The cofferdam structure of claim 6, wherein: The movable plate (3422) is fixedly connected to an inner rod (3432) on the side near the connecting rod (341). A sleeve rod (3431) is sleeved on the outer wall of the inner rod (3432). The sleeve rod (3431) is fixedly connected to the outer wall of the auxiliary support plate (342). A slip ring (3433) is fixedly connected to the outer wall of the inner rod (3432). The slip ring (3433) is slidably connected to the inner wall of the sleeve rod (3431). A pressure sensor (3434) is fixedly connected to the inner wall of the sleeve rod (3431). The slip ring (3433) and the pressure sensor (3434) are elastically connected by a connecting spring.

8. A method of constructing a cofferdam structure as claimed in any one of claims 1 to 7, characterised in that, Includes the following steps: S1. First, use a crane to insert the first installation column (101), the second installation column (102), and the pile (2) into the riverbed. After the first installation column (101), the second installation column (102), and the pile (2) are fixed and stable, insert the outer plate (103) and the inner plate (104) into the side grooves of the first installation column (101) and the second installation column (102). S2. Then fill the reinforcing layer (105) between the outer plate (103) and the inner plate (104). After the reinforcing layer (105) is filled, the mounting base (311) is detachably connected to the mounting port (1021) by bolts. Then install the reinforcing steel column (32) in the mounting base (311) to reinforce and support the inner plate (104). S3. Then, hinge the connecting rod (341) to the outer wall of the reinforcing steel column (32), then fix the auxiliary support plate (342) to the middle of the inner plate (104) with bolts, and then pump out the water in the cofferdam. S4. Then insert the grouting pipe (4) into the bottom of the riverbed and grout the grouting pipe (4) to generate a sealed base (5). S5. Then inject the mud through the grouting channel (1011). The mud squeezes the ring (24), and the ring (24) compresses the support spring, causing the ring (24) to drive the stop block (25) to move downward and break away from the obstruction of the opening (22). The mud enters the gap between the pile (2) and the riverbed soil through the opening (22) to reinforce the pile (2).

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