Deep and long steel sheet pile cofferdam structure

Abstract

The invention relates to the technical field of steel sheet pile cofferdams, in particular to a deep and long steel sheet pile cofferdam structure which comprises two steel pipe sets symmetrically distributed front and back, each steel pipe set is composed of a plurality of steel pipes linearly and evenly distributed, and a steel sheet pile is jointly connected between every two adjacent steel pipes. The deep and long steel sheet pile cofferdam structure further comprises a plurality of supporting mechanisms, and the supporting mechanisms are evenly distributed on the front sides and the rear sides of the two steel pipe sets. The sealing limiting parts and the supporting parts are alternately distributed and connected with each other, so that the multiple sealing limiting parts and the multiple supporting parts form a whole, two gaps with the same structure and adjacent positions are mutually complemented, force transmission can be conducted between the multiple sealing limiting parts and the multiple supporting parts, stress is uniform, and the sealing effect is good. And therefore, the overall supporting and limiting strength of the multiple sealing and limiting parts and the multiple supporting parts on the multiple steel pipes and the multiple steel sheet piles is improved, and the phenomenon that the single section of the cofferdam deforms is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of steel sheet pile cofferdams, and in particular to a deep and long steel sheet pile cofferdam structure. Background Art

[0002] Deep and long steel sheet pile cofferdam is a temporary soil and water retaining structure commonly used in deep foundation pit support, water conservancy projects, bridge construction and other fields. It has the characteristics of high strength, fast construction and reusability.

[0003] The deep and long steel sheet pile cofferdam needs to be reinforced by a support system after the steel sheet piles and steel pipes are spliced ​​together to form a closed or semi-closed space, isolating it from external water and soil, and creating a dry and safe working environment for internal construction.

[0004] After the construction of the existing deep and long steel sheet pile cofferdam, the cofferdam can be limited by internal support or external support. When the cofferdam is supported and limited by external support, due to the long length of the cofferdam, a segmented external support system is usually used to support the cofferdam. However, each section of the segmented support structure is independently stressed, and it cannot be ensured that each support structure is on the same vertical plane, making it difficult to achieve overall coordinated load transfer. This may cause some support structures to be overloaded while other sections are underloaded, forming local stress concentration, which in turn causes the support structure to deform, crack or even become unstable, resulting in poor sealing effect of the cofferdam and affecting the use of the entire cofferdam. In addition, in order to improve the support effect during installation, the existing segmented support structure needs to be welded, which makes the construction steps of the entire cofferdam cumbersome, reduces construction efficiency, and cannot achieve flexible installation and use of the support structure.

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

[0006] Based on this, it is necessary to provide a deep and long steel sheet pile cofferdam structure, which aims to solve the problems caused by the existing deep and long steel sheet pile cofferdam during construction.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a deep and long steel sheet pile cofferdam structure, comprising: two groups of steel pipes symmetrically distributed front and back, each group of steel pipes is composed of multiple linearly evenly distributed steel pipes, and steel sheet piles are commonly connected between two adjacent steel pipes.

[0008] At least two steel tensioning mechanisms are commonly connected between the two front-to-back symmetrical steel pipes. The steel tensioning mechanism includes two screw rods respectively penetrating the corresponding two steel pipes, and nuts are connected to the screw rods.

[0009] The deep and long steel sheet pile cofferdam structure also includes a supporting mechanism, which is provided in multiple numbers and evenly distributed on the front and rear sides of the two groups of steel pipe groups. The supporting mechanism is connected to multiple screws at the same height. The supporting mechanism includes multiple groups of sealing limit groups respectively connected to multiple corresponding screws. The sealing limit groups are composed of multiple sealing limit parts. The sealing limit parts are connected to multiple adjacent corresponding screws. Multiple supporting parts are connected to the multiple sealing limit parts. Each sealing limit part is connected to two adjacent supporting parts. The sealing limit part is also connected to multiple clamping parts for clamping between two adjacent supporting parts.

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

[0011] The support portion includes two I-beams symmetrically arranged on the upper and lower sides of the corresponding multiple screw rods. The front and rear side walls of the two I-beams are each provided with a plurality of evenly distributed plug holes, which are plugged into and matched with the corresponding support plates.

[0012] Preferably, the steel tensioning mechanism further comprises a pull rod arranged between the two screw rods, both ends of the pull rod are hinged with a bidirectional hinge, and the two bidirectional hinges are hinged to the two screw rods respectively.

[0013] Preferably, the support mechanism further comprises a plurality of tightening parts arranged on the side of the sealing limit part away from the steel pipe, and the tightening parts are simultaneously plugged into and matched with corresponding plug holes on the side of the two I-beams away from the steel pipe.

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

[0015] Preferably, the clamping part includes a clamping plate installed at one end of the corresponding connecting plate away from the steel sheet pile, and two groups of clamping holes are symmetrically opened on the clamping plate. The clamping hole group consists of at least two clamping holes, and a clamping rod is inserted into the clamping hole, and a handle is installed on the multiple clamping rods.

[0016] Preferably, the tightening portion includes a tightening plate sleeved on the corresponding screw rod, and two plug-in plates are symmetrically installed on one end of the tightening plate close to the steel pipe, and the plug-in plates are plugged into the corresponding plug-in holes.

[0017] Preferably, a positioning portion is provided between the two supporting portions at corresponding upper and lower positions, and the positioning portion includes two positioning plates symmetrically distributed above and below the center, and the two positioning plates are fixedly connected to the two corresponding upper and lower I-beams respectively, and the opposite ends of the two positioning plates are provided with stepped openings, and the two stepped openings cooperate with each other.

[0018] Preferably, two connectors are symmetrically installed on the outer ring surface of the steel pipe, the connectors are plug-fitted with the steel sheet piles, and through holes are symmetrically opened in the upper and lower parts of the steel pipe wall.

[0019] Preferably, the steel sheet pile is formed by splicing two Z-shaped steel plates.

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

[0021] 2. The support part adopted in the present invention can realize the positioning and alignment of the upper and lower support parts during installation, thereby effectively avoiding the phenomenon of excessive or insufficient feeding of any support part, ensuring that each support part supports and limits multiple steel pipes and multiple steel sheet piles, and also avoiding the phenomenon of local stress concentration and deformation of any support part, thereby ensuring the supporting effect of the support part.

[0022] 3. The support part, sealing limit part and tightening part adopted in the present invention cooperate with each other, and the support part can be directly connected without adding additional welding steps, so that the operation steps of the entire cofferdam construction are simple and convenient, and the support part can be flexibly installed and disassembled, with a high reuse rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 Shown is a schematic diagram of the three-dimensional structure of the present invention.

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

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

[0027] Figure 4 Shown Figure 2 Cross-sectional view of AA in the figure.

[0028] Figure 5 Shown Figure 4 Magnified view of area B.

[0029] Figure 6 A structural schematic diagram of part of the steel tensioning mechanism and part of the supporting mechanism of the present invention is shown.

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

[0031] Figure 8 It shows a structural schematic diagram of the sealing limiting part, the clamping part and the tightening part of the present invention.

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

[0033] Among them, the above-mentioned drawings include the following figure marks: 1. steel pipe; 10. connecting part; 11. through hole; 2. steel sheet pile; 20. Z-shaped steel plate; 3. steel tensioning mechanism; 30. screw; 31. pull rod; 32. bidirectional hinge; 4. supporting mechanism; 40. sealing limit part; 400. limit frame; 401. support plate; 402. sealing gasket; 403. connecting plate; 41. supporting part; 410. I-beam; 411. plug-in hole; 412. splicing hole; 42. clamping part; 420. clamping plate; 421. clamping hole; 422. clamping rod; 43. tightening part; 430. tightening plate; 431. plug-in plate; 44. positioning part; 440. positioning plate; 441. stepped opening. DETAILED DESCRIPTION

[0034] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope 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 groups of steel pipes symmetrically distributed front and back, each group of steel pipes consists of multiple linearly evenly distributed steel pipes 1, and steel sheet piles 2 are commonly connected between two adjacent steel pipes 1.

[0036] See Figure 1 、 Figure 2 and Figure 7The outer surface of the steel pipe 1 is symmetrically provided with two connectors 10, which are plugged into the steel sheet pile 2. The upper and lower parts of the wall of the steel pipe 1 are symmetrically provided with holes 11. The steel sheet pile 2 is formed by splicing two Z-shaped steel plates 20.

[0037] During the specific work, the structure assembled into a steel sheet pile cofferdam is transported to the construction site by an existing transport vehicle, and then the multiple steel pipes 1 and multiple steel sheet piles 2 are divided into two parts. According to the planned route, the multiple steel pipes 1 and multiple steel sheet piles 2 in each part are distributed alternately in the manner of steel pipes 1 and steel sheet piles 2 and inserted into the foundation of the planned route in sequence through existing hydraulic equipment to form two rows of cofferdams. The connecting piece 10 is a hook-shaped structure, and both ends of the Z-shaped steel plate 20 are also respectively provided with a hook-shaped bend. The two Z-shaped steel plates 20 are plugged in and matched through the two hook-shaped bends. The two Z-shaped steel plates 20 are vertically plugged in and matched with the corresponding connecting pieces 10 on the two steel pipes 1 through the hook-shaped bends, thereby realizing the function of connecting multiple steel pipes 1 with multiple steel sheet piles 2.

[0038] See Figure 1 、 Figure 3 and Figure 4 Two steel tensioning mechanisms 3 are commonly connected between the two front-to-back symmetrical steel pipes 1. The steel tensioning mechanism 3 includes two screws 30 that respectively penetrate the corresponding two steel pipes 1, and nuts are connected to the screws 30.

[0039] See Figure 4 and Figure 6 The steel tensioning mechanism 3 further includes a pull rod 31 arranged between the two screw rods 30 , and both ends of the pull rod 31 are hinged with a bidirectional hinge 32 , and the two bidirectional hinges 32 are hinged to the two screw rods 30 respectively.

[0040] During the specific work, after multiple steel pipes 1 and multiple steel sheet piles 2 are inserted into the foundation, first select a screw rod 30, and pass the screw rod 30 through the two through-holes 11 in the lower half of a steel pipe 1, then hinge the screw rod 30 with the two-way hinge 32 at the end of the pull rod 31, and then hinge the two-way hinge 32 at the other end of the pull rod 31 with another screw rod 30, and then pass the other screw rod 30 through the 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, and repeat this step 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 every two relative steel pipes 1, and existing tensioning equipment can also be set on the pull rod 31.

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

[0042] During specific operation, after multiple screws 30 are connected to the corresponding steel pipes 1, multiple limit frames 400 are connected to the multiple corresponding screws 30. The limit frames 400 drive the sealing gaskets 402 to be tightly attached to the surface of the steel pipe 1. The sealing gaskets 402 seal the penetration holes 11 on the steel pipe 1 to prevent water from seeping into the steel pipe 1. Multiple screws 30 support the multiple limit frames 400 and the connecting plates 403 fixedly connected to the multiple limit frames 400. Repeat this step until multiple sealing limit parts 40 are connected to the corresponding multiple screws 30.

[0043] See Figure 1 、 Figure 6 and Figure 9 A plurality of support portions 41 are connected to the plurality of sealing limit portions 40 , and each sealing limit portion 40 is connected to two adjacent support portions 41 . The sealing limit portion 40 is also connected to a plurality of clamping portions 42 for clamping between two adjacent support portions 41 .

[0044] See Figure 6 and Figure 8 The clamping part 42 includes a clamping plate 420 installed at the end of the corresponding connecting plate 403 away from the steel sheet pile 2. Two groups of clamping holes are symmetrically opened on the clamping plate 420. The clamping hole group consists of two clamping holes 421. A clamping rod 422 is inserted into the clamping hole 421, and a handle is installed on the multiple clamping rods 422.

[0045] During specific work, the connecting plate 403 is limited while the clamping plate 420 is limited. Reinforcement plates are installed at the upper and lower ends of the connecting plate 403 located at the clamping plate 420. The reinforcement 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 level of the connecting plate 403 is effectively improved.

[0046] See Figure 5 、 Figure 6 and Figure 9The support portion 41 includes two I-beams 410 symmetrically positioned above and below the corresponding screw rods 30. Multiple, evenly distributed insertion holes 411 are defined on the front and rear walls of each I-beam 410. These insertion holes 411 engage with the corresponding support plates 401. The support portion 41 also includes a set of splicing holes 412 located at the front and rear ends of the middle section of the I-beam 410.

[0047] See Figure 1 、 Figure 6 and Figure 8 The support mechanism 4 also includes a plurality of tightening parts 43 arranged on the side of the sealing limit part 40 away from the steel pipe 1, and the tightening parts 43 are plugged into and matched with the corresponding plug holes 411 of the two I-beams 410 away from the side of the steel pipe 1.

[0048] During the specific operation, after the multiple sealing limit parts 40 are installed, the support mechanism 4 of the lower half of the steel pipe 1 is installed first. The specific steps are: first select an I-beam 410 and place it on the side of the two adjacent sealing limit parts 40 away from the steel pipe 1 and on the lower side of the corresponding multiple screws 30, and the multiple plug holes 411 on the I-beam 410 are plugged into the support plates 401 on the lower side of the corresponding multiple limit frames 400 in the two sealing limit parts 40. The multiple lower support plates 401 support and limit the I-beam 410 connected thereto, and then the other I-beam is placed. 410 moves to the top of the installed I-beam 410 and is located on the upper side of the corresponding multiple screws 30, and then the multiple plug-in holes 411 of the upper I-beam 410 are plugged into the support plates 401 on the upper side of the corresponding multiple limit frames 400 in the two sealing limit parts 40, and the multiple upper support plates 401 support and limit the I-beams 410 connected to them. Repeat the installation steps of the two I-beams 410 until the multiple I-beams 410 are respectively connected to the multiple sealing limit parts 40, and each I-beam 410 after installation is respectively connected to two adjacent sealing limit parts 40.

[0049] The ends of the two adjacent groups of upper and lower I-beams 410 are simultaneously located at the same corresponding clamping plate 420, and then the handle is lifted, and the handle drives the two clamping rods 422 to be inserted into the corresponding plug-in holes 411, the clamping holes 421 and the corresponding plug-in holes 411 on the upper side in turn, so as to realize the connection between the two corresponding upper and lower I-beams 410 and the clamping plate 420, and repeat the previous steps, and connect the two adjacent upper and lower corresponding I-beams 410 to the same clamping plate 420 through the other two clamping rods 422, thereby realizing the function of connecting the two adjacent groups of upper and lower I-beams 410, and the two adjacent groups of upper and lower I-beams 410 cooperate with the clamping plate 420, which effectively improves the supporting strength of the two adjacent groups of upper and lower 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 portion 43 includes a tightening plate 430 sleeved on the corresponding screw rod 30. Two plug-in plates 431 are symmetrically installed on the upper and lower ends of the tightening plate 430 close to the steel pipe 1. The plug-in plates 431 are plugged into the corresponding plug-in holes 411.

[0051] During specific operation, after multiple support parts 41 are connected to multiple sealing limit parts 40, multiple tightening plates 430 are sequentially sleeved on multiple corresponding screw rods 30, and the tightening plates 430 drive two plug-in plates 431 to be plugged into the two plug-in holes 411 on the side of the corresponding upper and lower I-beams 410 away from the steel pipe 1, and then the tightening plates 430 are tightened to the surfaces of the two I-beams 410 through nuts, and another nut is moved to another screw rod 30 in the same steel tensioning mechanism 3, and the nut tightens the other tightening plate 430 to the surfaces of the corresponding two I-beams 410. At the same time, the nuts continue to be fed, and the nuts tighten and limit the I-beams 410 corresponding to the front and rear sides, the sealing limit parts 40 corresponding to the two sides, the multiple steel pipes 1 and the multiple steel sheet piles 2 as a whole, and the nut connection steps are repeated until the multiple nuts are connected to the multiple screws 30 located on the lower side. The multiple tightening plates 430 cooperate with the plug-in holes 411 through the plug-in 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 it can be flexibly installed and disassembled, with a high reuse rate.

[0052] See Figure 1 、 Figure 5 and Figure 6 A positioning portion 44 is provided between the two supporting portions 41 at corresponding upper and lower positions. The positioning portion includes two positioning plates 440 symmetrically distributed above and below the center. The two positioning plates 440 are fixedly connected to the two corresponding I-beams 410 above and below, respectively. Step openings 441 are provided at the opposite ends of the two positioning plates 440, and the two stepped openings 441 cooperate with each other.

[0053] During the specific operation, while the I-beam 410 at the lower part of the steel pipe 1 is installed and limited, the I-beam 410 located above limits the positioning plate 440 at the same time. The stepped opening 441 on the 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, and the remaining support mechanisms 4 are tightened and limited to multiple steel pipes 1 and multiple steel sheet piles 2 from the upper part of the steel pipe 1. In this process, it is necessary to pay attention to the last step of feeding the nut. The pushed I-beam 410 drives the positioning plate 440 connected to it to the already positioned positioning plate 440 direction until the stepped openings 441 of the two positioning plates 440 fit tightly with each other, and then the feeding of the nut is stopped. At this time, it can be ensured that the upper and lower support parts 41 are in the same vertical plane, ensuring the uniformity of the overall force of the multiple steel pipes 1 and the multiple steel sheet piles 2, avoiding the phenomenon that the stress is concentrated at one point and causes the support part 41 to bend. At the same time, the two positioning plates 440 that cooperate with each other can also support the upper and lower support parts 41, further improving the supporting strength of the support part 41 to the multiple steel pipes 1 and the multiple steel sheet piles 2.

[0054] After installation, the multiple sealing limit parts 40 and the multiple support parts 41 are alternately distributed, and two adjacent sealing limit parts 40 or two support parts 41 can be connected to each other, so that the multiple sealing limit parts 40 and the multiple support parts 41 have strong integrity, and the force can be shared, thereby improving the supporting and limiting strength of the multiple sealing limit parts 40 and the multiple support parts 41 to the multiple steel pipes 1 and the multiple steel sheet piles 2, avoiding the deformation of the individual sections of the cofferdam, and completing 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", "transverse", "up", "down", "front", "back", "left", "right", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0056] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A deep and long steel sheet pile cofferdam structure, characterized by: It includes two groups of steel pipes symmetrically distributed front and back, each group of steel pipes consists of multiple linearly evenly distributed steel pipes, and steel sheet piles are connected between two adjacent steel pipes; At least two steel tensioning mechanisms are connected between the two symmetrical steel pipes, and the steel tensioning mechanisms include two screws respectively passing through the corresponding two steel pipes, and nuts are connected to the screws; The support mechanism is provided with multiple and evenly distributed on the front and rear sides of the two groups of steel pipe groups. The support mechanism includes multiple groups of sealing limit groups respectively connected to multiple corresponding screws. The sealing limit groups are composed of multiple sealing limit parts. The multiple sealing limit parts are connected to multiple support parts. Each sealing limit part is connected to two adjacent support parts. The sealing limit part is also connected to a plurality of clamping parts. The sealing limit part includes a plurality of limit frames respectively sleeved on a plurality of corresponding screws, two support plates are symmetrically installed on the end of the limit frame away from the steel pipe, a sealing gasket is laid on the end of the limit frame close to the steel pipe, and a connecting plate is installed between two adjacent limit frames; The support portion includes two I-beams symmetrically arranged on the upper and lower sides of the multiple screw rods. A plurality of plug holes are opened on the front and rear side walls of the two I-beams, and the plug holes are plugged into and matched with the corresponding support plates.

2. The deep and 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, both ends of the pull rod are hinged with a bidirectional hinge, and the two bidirectional hinges are hinged to the two screw rods respectively.

3. The deep and long steel sheet pile cofferdam structure according to claim 1, characterized in that: The support mechanism also includes a plurality of tightening parts arranged on the side of the sealing limit part away from the steel pipe, and the tightening parts are simultaneously plugged into and matched with the corresponding plug holes on the side of the two I-beams away from the steel pipe.

4. The deep and long steel sheet pile cofferdam structure according to claim 1, characterized in that: The support portion further comprises a splicing hole group formed at the front and rear ends of the middle section of the I-beam, and the splicing hole group consists of at least two splicing holes.

5. The deep and long steel sheet pile cofferdam structure according to claim 1, characterized in that: The clamping part includes a clamping plate installed at one end of the corresponding connecting plate away from the steel sheet pile. Two groups of clamping holes are symmetrically opened on the clamping plate. The clamping hole group consists of at least two clamping holes. A clamping rod is inserted into the clamping hole, and a handle is installed on the multiple clamping rods.

6. The deep and long steel sheet pile cofferdam structure according to claim 3, characterized in that: The tightening part includes a tightening plate sleeved on the corresponding screw rod, and two plug-in plates are symmetrically installed on one end of the tightening plate close to the steel pipe, and the plug-in plates are plugged into the corresponding plug-in holes.

7. The deep and long steel sheet pile cofferdam structure according to claim 1, characterized in that: A positioning portion is provided between the two supporting portions at corresponding upper and lower positions. The positioning portion includes two positioning plates symmetrically distributed above and below the center. The two positioning plates are respectively fixedly connected to the two corresponding I-beams above and below. The opposite ends of the two positioning plates are provided with stepped openings, and the two stepped openings cooperate with each other.

8. The deep and 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, and the connecting pieces are plugged into and matched with the steel sheet piles. The upper and lower parts of the steel pipe wall are symmetrically provided with through holes.

9. The deep and long steel sheet pile cofferdam structure according to claim 1, characterized in that: The steel sheet pile is formed by splicing two Z-shaped steel plates.

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