A deep long steel sheet pile cofferdam structure

Abstract

The present application relates to the technical field of steel sheet pile cofferdam, and particularly relates to a deep long steel sheet pile cofferdam structure, which comprises two groups of steel pipe groups symmetrically distributed in front and back, each group of steel pipe groups is composed of a plurality of linearly and uniformly distributed steel pipes, and adjacent two steel pipes are jointly connected with a steel sheet pile; the deep long steel sheet pile cofferdam structure further comprises a supporting mechanism, the supporting mechanism is provided with a plurality of supporting mechanisms and is equally divided on the front and back sides of the two groups of steel pipe groups. The sealing limiting parts and the supporting parts are alternately distributed and connected with each other, so that the plurality of sealing limiting parts and the plurality of supporting parts form a whole and complement each other, the gaps between the plurality of sealing limiting parts and the plurality of supporting parts can transmit force, so that the force is evenly distributed, and the supporting and limiting strength of the plurality of sealing limiting parts and the plurality of supporting parts to the plurality of steel pipes and the plurality of steel sheet piles is improved, and the deformation of the individual section of the cofferdam is avoided.

Description

Technical Field

[0001] This invention relates to the field of sheet pile cofferdam technology, and particularly to a deep and long sheet pile cofferdam structure. Background Technology

[0002] Deep and long steel sheet pile cofferdams are temporary earth-retaining and water-blocking structures commonly used in deep foundation pit support, water conservancy projects, bridge construction, and other fields. They are characterized by high strength, quick construction, and reusability.

[0003] After the steel sheet piles and steel pipes are spliced, the deep and long steel sheet pile cofferdam needs to be reinforced by a support system to form a closed or semi-closed space, which isolates external water and soil and creates a dry and safe working environment for internal construction.

[0004] After construction, existing deep and long steel sheet pile cofferdams can be limited by internal or external bracing. When using external bracing, due to the long length of the cofferdam, a segmented external bracing system is usually used. However, each segment of the segmented support structure is subjected to independent force, and it cannot be ensured that each support structure is on the same vertical plane. This makes it difficult to achieve overall coordinated load transfer, which may lead to overloading of some support structures while other sections are underloaded, resulting in local stress concentration. This can cause deformation, cracking, or even instability of the support structure, resulting in poor sealing performance of the cofferdam and affecting its overall use. Furthermore, the existing segmented support structure requires welding during installation to improve the support effect, making the construction process cumbersome, reducing construction efficiency, and preventing flexible installation and use of the support structure.

[0005] Therefore, there is an urgent need to provide deep and long steel sheet pile cofferdam structures that can improve support strength and deformation resistance. Summary of the Invention

[0006] Therefore, it is necessary to provide a deep and long steel sheet pile cofferdam structure to solve the problems that arise during the construction of existing deep and long steel sheet pile cofferdams.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a deep and long steel sheet pile cofferdam structure, comprising: two sets of steel pipe groups symmetrically distributed front and rear, each set of steel pipe groups consisting of multiple linearly and uniformly distributed steel pipes, and steel sheet piles connecting adjacent steel pipes.

[0008] At least two steel tensioning mechanisms are connected between two symmetrical steel pipes. Each steel tensioning mechanism includes two screws that pass through the two corresponding steel pipes, and nuts are connected to the screws.

[0009] The deep and long steel sheet pile cofferdam structure also includes a support mechanism. The support mechanism is provided in multiple units and is evenly distributed on the front and rear sides of the two groups of steel pipes. The support mechanism is connected to multiple screws at the same height. The support mechanism includes multiple sealing and limiting groups connected to multiple corresponding screws. Each sealing and limiting group is composed of multiple sealing and limiting parts. Each sealing and limiting part is connected to multiple adjacent corresponding screws. Multiple supporting parts are connected to the multiple sealing and limiting parts. Each sealing and limiting part is connected to two adjacent supporting parts. Multiple locking parts for locking between two adjacent supporting parts are also connected to the sealing and limiting parts.

[0010] The sealing and limiting part includes multiple limiting frames respectively sleeved on multiple corresponding screws. Two support plates are symmetrically installed on the end of the limiting frame away from the steel pipe. A sealing gasket is laid on the end of the limiting frame close to the steel pipe. A connecting plate is installed between two adjacent limiting frames.

[0011] The support part includes two I-beams symmetrically arranged on the upper and lower sides of the corresponding multiple screws. Multiple evenly distributed insertion holes are opened on the front and rear side walls of the two I-beams, and the insertion holes are inserted and matched with the corresponding support plates.

[0012] Preferably, the steel tensioning mechanism further includes a tie rod disposed between the two screws, both ends of which are hinged with bidirectional hinges, and the two bidirectional hinges are respectively hinged to the two screws.

[0013] Preferably, the support mechanism further includes a plurality of tightening parts disposed on the side of the sealing and limiting part away from the steel pipe, and the tightening parts simultaneously engage with the corresponding insertion holes of the two I-beams on the side away from the steel pipe.

[0014] Preferably, the support portion further includes a set of splicing holes at the front and rear ends of the middle section of the I-beam, and the set of splicing holes consists of at least two splicing holes.

[0015] Preferably, the snap-fit ​​part includes a snap-fit ​​plate installed on the end of the corresponding connecting plate away from the sheet pile. The snap-fit ​​plate has two sets of snap-fit ​​holes symmetrically opened on the left and right sides. Each set of snap-fit ​​holes consists of at least two snap-fit ​​holes. A snap-fit ​​rod is inserted into the snap-fit ​​hole, and a handle is installed on multiple snap-fit ​​rods.

[0016] Preferably, the tightening part includes a tightening plate sleeved on the corresponding screw, and two plug plates are symmetrically installed at the end of the tightening plate near the steel pipe, and the plug plates are plugged into the corresponding plug holes.

[0017] Preferably, a positioning part is provided between the two support parts at corresponding positions above and below. The positioning part includes two positioning plates symmetrically distributed at the center of the upper and lower parts. The two positioning plates are fixedly connected to two corresponding I-beams above and below. Each of the two positioning plates has a stepped opening at its opposite end, and the two stepped openings cooperate with each other.

[0018] Preferably, two connectors are symmetrically installed on the outer ring of the steel pipe, and the connectors are inserted into the steel sheet pile. The upper and lower parts of the steel pipe wall are symmetrically provided with through holes.

[0019] Preferably, the sheet pile is made of two Z-shaped steel plates spliced ​​together.

[0020] In summary, the present invention has the following beneficial technical effects: 1. The sealing and limiting parts and the supporting parts adopted in the present invention are alternately distributed and interconnected, so that multiple sealing and limiting parts and multiple supporting parts form an integral whole and complement each other in the gaps of two adjacent positions of the same structure. Force can be transmitted between multiple sealing and limiting parts and multiple supporting parts, so that the force is uniform, thereby improving the supporting and limiting strength of multiple sealing and limiting parts and multiple supporting parts for multiple steel pipes and multiple steel sheet piles as a whole, avoiding deformation of individual sections of the cofferdam. At the same time, the sealing and limiting parts can also seal the connection between the steel tensioning mechanism and the steel pipe, preventing water seepage during use.

[0021] 2. The support unit used in this invention can achieve positioning and alignment of the upper and lower support units during installation, thereby effectively avoiding the phenomenon of excessive or insufficient feed of any support unit. This ensures that each support unit supports and limits multiple steel pipes and multiple steel sheet piles, and also avoids the phenomenon of stress concentration in any support unit causing deformation, thus ensuring the support effect of the support unit.

[0022] 3. The support part, sealing and limiting part and tightening part adopted in this invention can be directly connected to the support part without the need for additional welding steps, which makes the operation steps of the entire cofferdam construction simple and convenient, and the support part can be flexibly installed and disassembled, with a high reuse rate. Attached Figure Description

[0023] 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 A three-dimensional structural schematic diagram of the present invention is shown.

[0025] Figure 2 A front view of the present invention is shown.

[0026] Figure 3 A left view of the invention is shown.

[0027] Figure 4 It shows Figure 2 Sectional view of AA.

[0028] Figure 5 It shows Figure 4 A magnified view of region B in the middle.

[0029] Figure 6 The diagram shows a partial steel tensioning mechanism and a partial support mechanism of the present invention.

[0030] Figure 7 A schematic diagram of the steel pipe and sheet pile of the present invention is shown.

[0031] Figure 8 A schematic diagram of the sealing and limiting part, the snap-fit ​​part, and the tightening part of the present invention is shown.

[0032] Figure 9 A schematic diagram of the support portion of the present invention is shown.

[0033] The above-mentioned drawings include the following reference numerals: 1. Steel pipe; 10. Connector; 11. Through hole; 2. Steel sheet pile; 20. Z-shaped steel plate; 3. Steel tensioning mechanism; 30. Screw; 31. Tie rod; 32. Two-way hinge; 4. Support mechanism; 40. Sealing and limiting part; 400. Limiting frame; 401. Support plate; 402. Sealing gasket; 403. Connecting plate; 41. Support part; 410. I-beam; 411. Insertion hole; 412. Splicing hole; 42. Snap-fit ​​part; 420. Snap-fit ​​plate; 421. Snap-fit ​​hole; 422. Snap-fit ​​rod; 43. Tightening part; 430. Tightening plate; 431. Insertion plate; 44. Positioning part; 440. Positioning plate; 441. Step opening. Detailed Implementation

[0034] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] See Figure 1 , Figure 2 and Figure 7 A deep and long steel sheet pile cofferdam structure includes two sets of steel pipe groups symmetrically distributed front and back. Each set of steel pipe groups consists of multiple linearly and uniformly distributed steel pipes 1, and steel sheet piles 2 are connected between two adjacent steel pipes 1.

[0036] See Figure 1 , Figure 2 and Figure 7The steel pipe 1 has two connectors 10 symmetrically installed on its outer ring. The connectors 10 are inserted into the sheet pile 2. The upper and lower parts of the steel pipe 1 are symmetrically provided with through holes 11. The sheet pile 2 is made of two Z-shaped steel plates 20 spliced ​​together.

[0037] In practice, the assembled sheet pile cofferdam structure is transported to the construction site using existing transport vehicles. Then, multiple steel pipes 1 and multiple sheet piles 2 are divided into two parts. According to the planned route, the multiple steel pipes 1 and multiple sheet piles 2 of each part are inserted into the foundation of the planned route in an alternating manner using existing hydraulic equipment to form two rows of cofferdams. The connector 10 has a hook-shaped structure, and the two ends of the Z-shaped steel plate 20 are also provided with hook-shaped bends. The two Z-shaped steel plates 20 are connected by two hook-shaped bends. The two Z-shaped steel plates 20 are vertically connected to the corresponding connectors 10 on the two steel pipes 1 through hook-shaped bends, so as to realize the function of connecting multiple steel pipes 1 and multiple sheet piles 2.

[0038] See Figure 1 , Figure 3 and Figure 4 Two steel pipes 1, which are symmetrical front and back, are connected by two steel tensioning mechanisms 3. The steel tensioning mechanism 3 includes two screws 30 that pass through the two corresponding steel pipes 1 respectively, and nuts are connected to the screws 30.

[0039] See Figure 4 and Figure 6 The steel tensioning mechanism 3 also includes a pull rod 31 disposed between the two screws 30. Both ends of the pull rod 31 are hinged with a two-way hinge 32, and the two two-way hinges 32 are respectively hinged to the two screws 30.

[0040] In practice, after multiple steel pipes 1 and multiple sheet piles 2 are inserted into the foundation, a screw rod 30 is selected and passed through two through holes 11 in the lower half of a steel pipe 1. Then, the screw rod 30 is hinged to the double hinge 32 at the end of the tie rod 31. The double hinge 32 at the other end of the tie rod 31 is then hinged to another screw rod 30. Then, the other screw rod 30 is passed through two through holes 11 in the lower half of another steel pipe 1 at the corresponding position, so as to realize the function of connecting the steel tensioning mechanism 3 with the corresponding two steel pipes 1. This step is repeated until multiple steel tensioning mechanisms 3 are connected to multiple corresponding steel pipes 1. At this time, two steel tensioning mechanisms 3 are connected to each pair of opposite steel pipes 1. Existing tensioning devices can also be installed on the tie rod 31.

[0041] See Figure 1 , Figure 4 , Figure 5 and Figure 6The deep and long steel sheet pile cofferdam structure also includes a support mechanism 4. The support mechanism 4 is provided in multiple units and is evenly distributed on the front and rear sides of the two groups of steel pipes. The support mechanism 4 is connected to multiple screws 30 at the same height. The support mechanism 4 includes multiple sealing and limiting groups that are respectively connected to multiple corresponding screws 30. The sealing and limiting group is composed of multiple sealing and limiting parts 40. The sealing and limiting parts 40 are connected to multiple adjacent corresponding screws 30. The sealing and limiting parts 40 include multiple limiting frames 400 that are respectively sleeved on multiple corresponding screws 30. Two support plates 401 are symmetrically installed at the end of the limiting frame 400 away from the steel pipe 1. A sealing gasket 402 is laid at the end of the limiting frame 400 close to the steel pipe 1. A connecting plate 403 is installed between two adjacent limiting frames 400.

[0042] In practice, after multiple screws 30 are inserted into the corresponding steel pipes 1, multiple limiting frames 400 are inserted into the multiple corresponding screws 30. The limiting frames 400 cause the sealing gaskets 402 to be in close contact with the surface of the steel pipes 1. The sealing gaskets 402 seal the through holes 11 on the steel pipes 1 to prevent water from seeping into the steel pipes 1. The multiple screws 30 support the multiple limiting frames 400 and the connecting plates 403 that are fixedly connected to the multiple limiting frames 400. This step is repeated until the multiple sealing limiting parts 40 are connected to the multiple screws 30.

[0043] See Figure 1 , Figure 6 and Figure 9 Multiple sealing limiting parts 40 are connected to multiple support parts 41. Each sealing limiting part 40 is connected to two adjacent support parts 41. Multiple locking parts 42 for locking between two adjacent support parts 41 are also connected to the sealing limiting parts 40.

[0044] See Figure 6 and Figure 8 The snap-fit ​​part 42 includes a snap-fit ​​plate 420 installed on the end of the corresponding connecting plate 403 away from the sheet pile 2. Two sets of snap-fit ​​holes are symmetrically opened on the snap-fit ​​plate 420. Each snap-fit ​​hole set consists of two snap-fit ​​holes 421. A snap-fit ​​rod 422 is inserted into the snap-fit ​​hole 421. A handle is installed on multiple snap-fit ​​rods 422.

[0045] In specific operations, the connecting plate 403 is limited while the snap-fit ​​plate 420 is also limited. Reinforcing plates are installed at both the upper and lower ends of the connecting plate 403 located at the snap-fit ​​plate 420. The reinforcing plates effectively increase the contact area between the connecting plate 403 and the two Z-shaped steel plates 20. After the pouring construction, the stress of the connecting plate 403 is effectively improved.

[0046] See Figure 5 , Figure 6 and Figure 9The support part 41 includes two I-beams 410 symmetrically arranged on the upper and lower sides of the corresponding plurality of screws 30. Multiple evenly distributed insertion holes 411 are provided on the front and rear side walls of each of the two I-beams 410, and the insertion holes 411 are inserted into and fitted with the corresponding support plate 401. The support part 41 also includes a group of splicing holes at the front and rear ends of the middle section of the I-beams 410, and the group of splicing holes consists of at least two splicing holes 412.

[0047] See Figure 1 , Figure 6 and Figure 8 The support mechanism 4 also includes a plurality of tightening parts 43 disposed on the side of the sealing and limiting part 40 away from the steel pipe 1, and the tightening parts 43 are engaged with the corresponding insertion holes 411 of the two I-beams 410 on the side away from the steel pipe 1.

[0048] In practice, after the multiple sealing and limiting parts 40 are installed, the support mechanism 4 of the lower half of the steel pipe 1 is installed first. The specific steps are as follows: First, select an I-beam 410 and place it on the side away from the steel pipe 1 of the two adjacent sealing and limiting parts 40, and under the corresponding multiple screws 30. The multiple insertion holes 411 on the I-beam 410 are inserted and engaged with the support plates 401 on the lower side of the corresponding multiple limiting frames 400 in the two sealing and limiting parts 40. The multiple lower support plates 401 support and limit the I-beam 410 connected to them. Then, another I-beam is installed. 410 is moved above the installed I-beam 410 and positioned on the upper side of the corresponding multiple screws 30. Then, the multiple insertion holes 411 of the upper I-beam 410 are inserted and engaged with the support plates 401 on the upper side of the corresponding multiple limit frames 400 in the two sealing limit parts 40. The multiple upper support plates 401 support and limit the I-beam 410 connected to them. The installation steps of the two I-beams 410 are repeated until the multiple I-beams 410 are connected to the multiple sealing limit parts 40 respectively. After installation, each I-beam 410 is connected to the two adjacent sealing limit parts 40 respectively.

[0049] The ends of two adjacent sets of vertically distributed I-beams 410 are simultaneously located at the same corresponding snap-fit ​​plate 420. Then, the handle is lifted, and the handle drives two snap-fit ​​rods 422 to be inserted sequentially into the corresponding insertion holes 411, snap-fit ​​hole 421 on the upper side and the corresponding insertion hole 411 on the lower side, so that the two vertically distributed I-beams 410 are connected to the snap-fit ​​plate 420. Repeating the previous steps, the two adjacent vertically distributed I-beams 410 are connected to the same snap-fit ​​plate 420 through the other two snap-fit ​​rods 422, thereby realizing the function of connecting the two adjacent sets of vertically distributed I-beams 410. The two adjacent sets of vertically distributed I-beams 410 and the snap-fit ​​plate 420 cooperate to effectively improve the support strength of the two adjacent sets of vertically distributed I-beams 410 for multiple steel pipes 1 and multiple steel sheet piles 2.

[0050] See Figure 6 , Figure 8 and Figure 9 The tightening part 43 includes a tightening plate 430 sleeved on the corresponding screw 30. Two plug plates 431 are symmetrically installed at the end of the tightening plate 430 near the steel pipe 1. The plug plates 431 are plugged into the corresponding plug holes 411.

[0051] In practice, after multiple support parts 41 are connected to multiple sealing and limiting parts 40, multiple tightening plates 430 are sequentially fitted onto multiple corresponding screws 30. The tightening plates 430 drive two insertion plates 431 to insert into the two insertion holes 411 on the side of the corresponding upper and lower I-beams 410 away from the steel pipe 1. Then, the tightening plates 430 are tightened to the surfaces of the two I-beams 410 by nuts. Then, another nut is moved to another screw 30 in the same steel tensioning mechanism 3, and the nut tightens another tightening plate 430 to the surfaces of the corresponding two I-beams 410. Simultaneously, the nuts continue to be fed, and the nuts tighten and limit the corresponding I-beams 410 on the front and rear sides, the corresponding sealing and limiting parts 40 on both sides, the multiple steel pipes 1 and the multiple steel sheet piles 2 as a whole. The nut connection steps are repeated until the multiple nuts are connected to the multiple screws 30 located on the lower side. The multiple top clamping plates 430 cooperate with the insertion holes 411 through the insertion plates 431 to further realize the function of limiting the upper and lower I-beams 410. There is no need to weld the upper and lower I-beams 410 together. The operation steps are simple and convenient, and they can be flexibly installed and disassembled with a high reuse rate.

[0052] See Figure 1 , Figure 5 and Figure 6 A positioning part 44 is provided between the two support parts 41 at corresponding positions above and below. The positioning part includes two positioning plates 440 symmetrically distributed at the center of the upper and lower parts. The two positioning plates 440 are fixedly connected to the two corresponding I-beams 410 above and below. Each of the two positioning plates 440 has a stepped opening 441 at its opposite end, and the two stepped openings 441 cooperate with each other.

[0053] In practice, while the I-beam 410 at the lower part of the steel pipe 1 is being installed and limited, the upper I-beam 410 simultaneously limits the positioning plate 440. The stepped opening 441 on this positioning plate 440 is away from the steel pipe 1. The installation steps of the support mechanism 4 at the lower part of the steel pipe 1 are repeated. The remaining support mechanism 4 is then tightened and limited from the upper part of the steel pipe 1 to multiple steel pipes 1 and multiple sheet piles 2. During this process, it is important to note that when the nut is fed in the last step, the pushed I-beam 410 will drive the positioning plate 440 connected to it towards the already positioned positioning plate. Move in the 440 direction until the stepped openings 441 of the two positioning plates 440 are tightly fitted together, and then stop feeding the nut. At this time, it can be ensured that the upper and lower support parts 41 are on the same vertical plane, ensuring the uniformity of the overall force on the multiple steel pipes 1 and multiple steel sheet piles 2, and avoiding the phenomenon of stress concentration at one point causing the support part 41 to bend. At the same time, the two positioning plates 440 that fit together can also support the upper and lower support parts 41, further improving the support strength of the support parts 41 for the multiple steel pipes 1 and multiple steel sheet piles 2.

[0054] After installation, multiple sealing and limiting parts 40 and multiple supporting parts 41 are alternately distributed, and can connect two adjacent sealing and limiting parts 40 or two supporting parts 41, so that the multiple sealing and limiting parts 40 and multiple supporting parts 41 have strong integrity and the stress can be distributed. This improves the supporting and limiting strength of the multiple sealing and limiting parts 40 and multiple supporting parts 41 for multiple steel pipes 1 and multiple steel sheet piles 2, avoids deformation of individual sections of the cofferdam, and completes the construction of the deep and long steel sheet pile cofferdam.

[0055] In the description of the embodiments of the present invention, it should be noted that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of the present invention and for 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, they should not be construed as limitations on the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0056] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A deep long steel sheet pile cofferdam structure, characterized by: Two groups of steel pipe groups are symmetrically distributed, each group of steel pipe groups is composed of a plurality of linearly and uniformly distributed steel pipes, and steel sheet piles are connected between adjacent two steel pipes; At least two steel tensioning mechanisms are connected between the two steel pipes symmetrically in front and back, and each steel tensioning mechanism comprises two screw rods penetrating through the corresponding two steel pipes, and nuts are connected to the screw rods; A plurality of support mechanisms are provided and evenly distributed on the front and back sides of the two groups of steel pipe groups, and each support mechanism comprises a plurality of sealing and limiting groups connected to the corresponding screw rods, each sealing and limiting group is composed of a plurality of sealing and limiting parts, a plurality of support parts are connected to the sealing and limiting parts, each sealing and limiting part is connected to two adjacent support parts, and a plurality of clamping parts are connected to the sealing and limiting parts; The sealing and limiting part comprises a plurality of limiting frames sleeved on the corresponding screw rods, two support plates are symmetrically installed at the end of the limiting frame away from the steel pipe, a sealing gasket is laid on the end of the limiting frame close to the steel pipe, and a connecting plate is jointly installed between adjacent two limiting frames; The support part comprises two I-shaped steels symmetrically arranged on the upper and lower sides of the plurality of screw rods, a plurality of insertion holes are formed in the front and back sidewalls of the two I-shaped steels, and the insertion holes are in insertion fit with the corresponding support plates; The support mechanism further comprises a plurality of top pressing parts arranged on the side of the sealing and limiting part away from the steel pipe, and the top pressing parts are in insertion fit with the corresponding insertion holes on the side of the two I-shaped steels away from the steel pipe; A positioning part is arranged between two support parts at corresponding positions, the positioning part comprises two positioning plates symmetrically distributed at the center of the upper and lower sides, the two positioning plates are fixedly connected to the corresponding I-shaped steels on the upper and lower sides, and the opposite ends of the two positioning plates are provided with stepped openings which are in mutual fit.

2. The long steel sheet pile cofferdam structure according to claim 1, characterized in that: The steel tensioning mechanism further comprises a pull rod arranged between the two screw rods, and two bidirectional hinges are hingedly connected to the two ends of the pull rod.

3. The long steel sheet pile cofferdam structure according to claim 1, characterized in that: The support part further comprises a plurality of splicing holes formed at the front and back ends of the middle section of the I-shaped steel.

4. The long steel sheet pile cofferdam structure according to claim 1, characterized in that: The clamping part comprises a clamping plate installed on the end of the corresponding connecting plate away from the steel sheet pile, two groups of clamping hole groups are symmetrically formed on the clamping plate, each clamping hole group is composed of at least two clamping holes, a clamping rod is inserted into the clamping hole, and a handle is jointly installed on the plurality of clamping rods.

5. The long steel sheet pile cofferdam structure according to claim 3, characterized in that: The top pressing part comprises a top pressing plate sleeved on the corresponding screw rod, two insertion plates are symmetrically installed on the end of the top pressing plate close to the steel pipe, and the insertion plates are in insertion fit with the corresponding insertion holes.

6. The long steel sheet pile cofferdam structure according to claim 1, characterized in that: Two connecting pieces are symmetrically installed on the outer ring surface of the steel pipe, the connecting pieces are in insertion fit with the steel sheet pile, and the steel pipe wall is symmetrically provided with a plurality of through holes.

7. The long steel sheet pile cofferdam structure according to claim 1, characterized in that: The steel sheet pile is spliced by two Z-shaped steel plates.

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