A method for installing a double-row steel sheet pile cofferdam structure

Abstract

The application discloses a novel installation method of double-row steel sheet pile cofferdam structure, which comprises the following steps: installing an I-shaped steel at the center of the set position of two rows of Larsen steel sheet pile groups, and fixing the two ends of the I-shaped steel to a pair of river embankments; tightly installing an outer Larsen steel sheet pile group on the side of the I-shaped steel far from the water flow, and spacing a plurality of pile groups one in the inner cavity of the outer Larsen steel sheet pile group far from the I-shaped steel, the bottom ends of the pile groups one being inserted into the foundation for supporting the outer Larsen steel sheet pile group; tightly installing an inner Larsen steel sheet pile group on the side of the I-shaped steel close to the water flow, and spacing a plurality of pile groups two in the inner cavity of the Larsen steel sheet pile group between the inner Larsen steel sheet pile group and the I-shaped steel, the bottom ends of the pile groups two being inserted into the foundation for supporting the inner Larsen steel sheet pile group. The cofferdam structure installed by the installation method has good water flow impact resistance, anti-permeability and support stability.

Description

Technical Field

[0001] The present invention relates to the technical field of double-row steel sheet pile cofferdam construction, and more particularly to a novel installation method of a double-row steel sheet pile cofferdam structure. Background Art

[0002] Cofferdam construction generally falls into two main structural types: earth-rock cofferdams and sheet pile cofferdams. Large earth-rock cofferdams are less than ideal in terms of stability, foundation bearing capacity, and waterproofing, and they also require a long construction period. Steel sheet pile cofferdams, on the other hand, are smaller in size and have a smaller impact area. They can be constructed using double-row sheet pile structures or lattice sheet pile structures. Compared to lattice steel sheet piles, double-row steel sheet pile cofferdams offer advantages such as greater stability, improved water-stopping properties, and ease of recycling. Using a double-row steel sheet pile cofferdam as a cofferdam construction structure, the cofferdam structure, partially formed by splicing Larsen steel sheet piles, is installed within the river channel to block the river water and create an enclosed space. However, the upstream cofferdam structure, facing the water, is subject to the continuous impact of the river water for extended periods, causing deformation and damage to the Larsen steel sheet pile joints. In severe cases, this can lead to leakage in the cofferdam structure, severely impacting the construction process. Deformation of the steel sheet piles is primarily due to insufficient support points, resulting from the prolonged erosion of the river water. Therefore, it is of great significance to realize the installation of the connecting structure between the double-row steel sheet pile cofferdams and the installation of the double-row steel sheet pile cofferdams through the set installation method to enhance the stability of the steel sheet pile cofferdam structure. Summary of the Invention

[0003] An object of the present invention is to provide a novel installation method for a double-row steel sheet pile cofferdam structure, wherein the installed cofferdam structure has good water flow impact resistance, anti-seepage performance and support stability.

[0004] To solve the above technical problems, the present invention provides a novel installation method for a double-row steel sheet pile cofferdam structure. The cofferdam structure is arranged along the width of the river channel and covers a pair of riverbanks. It includes two rows of Larsen steel sheet pile groups arranged at intervals. The rows are arranged in a mirror image. The Larsen steel sheet pile group away from the water flow is defined as the outer Larsen steel sheet pile group, and the Larsen steel sheet pile group close to the water flow is defined as the inner Larsen steel sheet pile group. The installation method includes the following steps:

[0005] Step 1: Install an I-beam at the center of the set position of the two rows of Larsen steel sheet pile groups, and fix the two ends of the I-beam to a pair of river embankments respectively;

[0006] Step 2: Install an outer Larsen steel sheet pile group against the side of the I-beam away from the water flow. At the same time, multiple pile groups 1 are spaced apart in the inner cavity of the outer Larsen steel sheet pile group away from the I-beam, with the bottom ends of the pile groups inserted into the foundation to support the outer Larsen steel sheet pile group; the flange plate of the I-beam contacts and abuts against the concave portion of the outer Larsen steel sheet pile group away from the I-beam;

[0007] Step 3: Install an inner Larsen steel sheet pile group against the water flow side of the I-beam, and simultaneously install multiple second pile groups in the inner cavity of the Larsen steel sheet pile group between the inner Larsen steel sheet pile group and the I-beam, with the bottom ends of the second pile groups inserted into the foundation to support the inner Larsen steel sheet pile group; the flange plate of the I-beam contacts and abuts against the concave portion of the inner Larsen steel sheet pile group facing the I-beam;

[0008] The I-beams connect the two rows of Larsen steel sheet pile groups to form a whole, and the plurality of pile groups 1 and the plurality of pile groups 2 are staggered with each other.

[0009] Preferably, in step one, a plurality of vertical through openings are provided at equal intervals on the top of the I-beam along the width of the river channel, which are located in the center of the I-beam. After both ends of the I-beam are fixed, a plurality of supporting piles are vertically inserted into the plurality of openings one by one, and the bottom ends of the supporting piles are inserted into the foundation.

[0010] Preferably, in step 2 and step 3, the pile group 1 and the pile group 2 have the same structure and both include a pile seat and a pair of steel piles located in the pile seat, the rear side of the pile seat is in contact with the Larsen steel sheet pile, and the front side is provided with a pair of arc-shaped grooves, a pair of steel columns are clamped in the pair of arc-shaped grooves, and the bottom ends of the pair of steel columns are vertically inserted into the foundation to fix the pile seat.

[0011] Preferably, in step three, before installing the Nerarsen steel sheet pile group, a plurality of support assemblies are provided on the web of the I-beam in one-to-one correspondence with the plurality of pile groups 2. After the Nerarsen steel sheet pile group is installed, the support assemblies are in one-to-one contact with and against the plurality of pile groups 2.

[0012] The cam is connected to the drive mechanism by the spring which is located at the top of the gear train and the drive mechanism is connected to the cam by a threaded rod and a pinion which is located at the bottom of the gear train.

[0013] Preferably, the clamping seat is fixedly connected to a connecting seat relative to the other side of the connecting sliding seat, and sliding blocks are provided on the upper and lower sides thereof. A pair of slide grooves are relatively provided on the pair of flange plates of the I-beam, and the upper and lower sliding blocks are slidably connected to the pair of slide grooves; while constructing step 2, multiple support assemblies are slid from the two ends of the pair of slide grooves to between the pair of flange plates of the I-beam through the upper and lower sliding blocks, and are initially positioned to the set positions of multiple pile groups two; in step 3, when installing the Larsen steel sheet pile group, the position of the support assembly can be adaptively adjusted according to the installation situation by sliding the upper and lower sliding blocks, so that the support assembly is located in the inner cavity of the steel sheet pile group corresponding to pile group two.

[0014] Preferably, in step 2 and step 3, each row of Larsen steel sheet pile groups is formed by splicing multiple Larsen steel sheet piles, and adjacent Larsen steel sheet piles are connected to each other as a whole through the bending parts on both sides. The bending parts on both sides of the Larsen steel sheet piles are provided with sealing strips. After the clamping, the sealing strips located at the bending parts are in interference fit with each other. Each row of Larsen steel sheet pile groups can be installed as a whole after the overall assembly is completed, or can be installed by clamping in sequence.

[0015] The present invention has at least the following beneficial effects:

[0016] 1. The installation method of the present invention facilitates the support of auxiliary steel sheet piles by arranging pile groups, I-beams and support components, thereby improving the supporting performance of Larsen steel sheet piles, thereby improving the performance of Larsen steel sheet piles in resisting water flow impact and the stability of the steel sheet piles, and minimizing the deformation and damage of the splicing positions of the Larsen steel sheet piles due to the impact force of river water, which may cause water leakage and seepage in the cofferdam structure in severe cases.

[0017] 2. The Larsen steel sheet piles of the present invention are provided with sealing strips at the bending parts on both sides. Adjacent Larsen steel sheet piles are clamped together through the bending parts. After clamping, the sealing strips located at the bending parts are in interference fit, thereby sealing the gaps between adjacent Larsen steel sheet piles and achieving waterproof sealing.

[0018] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the I-beam, support assembly and pile group in the present invention;

[0021] Figure 3 is a schematic plan view of the support assembly of the present invention;

[0022] Figure 4 Schematic diagram of the structure of pile group 1 and pile group 2 of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the Larsen steel sheet pile group of the present invention.

[0024] Description of reference numerals:

[0025] 1. Riverbank, 2. Larsen steel sheet pile, 3. I-beam, 4. Support pile, 5. Pile group one, 6. Pile group two, 7. Support assembly, 71. Sliding seat, 72. Threaded rod, 73. Snap-on seat, 74. Worm gear, 75. Worm, 76. Rotating rod, 77. Connecting seat, 78. Sliding block, 8. Pile seat, 9. Steel pile. DETAILED DESCRIPTION

[0026] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below with reference to the accompanying drawings so that those skilled in the art can implement it according to the description.

[0027] It should be noted that, in the description of the present invention, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They 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, and therefore cannot be understood as a limitation on the present invention.

[0028] like Figures 1 to 5 As shown, the present invention provides a novel installation method for a double-row steel sheet pile cofferdam structure. The cofferdam structure is arranged along the width of the river channel and covers a pair of riverbanks 1. It includes two groups of Larsen steel sheet piles 2 arranged at intervals. The Larsen steel sheet pile group away from the water flow is defined as the outer Larsen steel sheet pile group, and the Larsen steel sheet pile group close to the water flow is defined as the inner Larsen steel sheet pile group. The installation method includes the following steps:

[0029] Step 1: Install an I-beam at the center of the set position of the two rows of Larsen steel sheet pile groups, and fix the two ends of the I-beam to a pair of river embankments respectively;

[0030] Step 2: Install an outer Larsen steel sheet pile group against the side of the I-beam away from the water flow. At the same time, multiple pile groups 1 are spaced apart in the inner cavity of the outer Larsen steel sheet pile group away from the I-beam, with the bottom ends of the pile groups inserted into the foundation to support the outer Larsen steel sheet pile group; the flange plate of the I-beam contacts and abuts against the concave portion of the outer Larsen steel sheet pile group away from the I-beam;

[0031] Step 3: Install an inner Larsen steel sheet pile group against the water flow side of the I-beam, and simultaneously install multiple second pile groups in the inner cavity of the Larsen steel sheet pile group between the inner Larsen steel sheet pile group and the I-beam, with the bottom ends of the second pile groups inserted into the foundation to support the inner Larsen steel sheet pile group; the flange plate of the I-beam contacts and abuts against the concave portion of the inner Larsen steel sheet pile group facing the I-beam;

[0032] The I-beams connect the two rows of Larsen steel sheet pile groups to form a whole, and the plurality of pile groups 1 and the plurality of pile groups 2 are staggered with each other.

[0033] An I-beam 3 is arranged between the two rows of Larsen steel sheet piles 2 groups, which connect the two rows of Larsen steel sheet piles 2 groups to form a whole. The two ends of the I-beam 3 are respectively fixed in a pair of riverbanks 1. The Larsen steel sheet piles 2 groups close to the water flow are the inner Larsen steel sheet piles 2 groups, and the Larsen steel sheet piles 2 groups away from the water flow are the outer Larsen steel sheet piles 2 groups. The inner cavity intervals of the Larsen steel sheet piles 2 groups between the inner Larsen steel sheet piles 2 groups and the I-beam 3 are provided with multiple pile groups 2 6, and the inner cavity intervals of the outer Larsen steel sheet piles 2 groups on the side away from the I-beam 3 are provided with multiple pile groups 1 5. The pile groups 1 5 and pile groups 2 6 are staggered with each other and the bottom ends are inserted into the foundation to support the Larsen steel sheet piles 2 groups.

[0034] The double-layer cofferdam structure is composed of two rows of Larsen steel sheet piles 2 arranged along the width of the river channel. Each row of Larsen steel sheet piles 2 is formed by splicing multiple Larsen steel sheet piles 2, and the two rows of Larsen steel sheet piles 2 are mirror images of each other. An I-beam 3 is arranged between the two rows of Larsen steel sheet piles 2. The two rows of Larsen steel sheet piles 2 are connected to form a whole through the I-beam 3, so that the two rows of Larsen steel sheet piles 2 can support each other, which greatly improves the impact resistance of the double-layer cofferdam structure composed of the Larsen steel sheet piles 2 and increases the stability of the cofferdam structure.

[0035] Tubular piles are arranged in the inner cavity of each Larsen steel sheet pile 2, and the tubular piles are divided into a pile group 2 6 located between the two rows of Larsen steel sheet piles 2 and a pile group 1 5 located on the side away from the two rows of Larsen steel sheet piles 2. The two groups of Larsen steel sheet piles close to the water flow are the inner Larsen steel sheet piles group 2, and the ones away from the water flow are the outer Larsen steel sheet piles group 2. A plurality of pile groups 2 6 are arranged at intervals in the inner cavity between the inner Larsen steel sheet piles group 2 and the I-beam 3, and a plurality of pile groups 1 5 are arranged at intervals on the side of the outer Larsen steel sheet piles group 2 away from the I-beam 3. The pile groups 1 5 and the pile groups 2 6 are staggered with each other. Each Larsen steel sheet pile 2 is provided with a pile group 1 5 or a pile group 2 6. The pile groups 2 6 and the pile groups 1 5 are tightly fitted with the corresponding Larsen steel sheet piles 2, and are used to support the Larsen steel sheet piles 2, thereby improving the performance of the Larsen steel sheet piles 2 in resisting water flow impact. By supporting the connection between the Larsen steel sheet piles 2 and the pile groups 1 5, deformation of the Larsen steel sheet piles 2 in the water-facing position due to impact when the river water impacts is avoided as much as possible.

[0036] In another technical solution,Figure 2 As shown, in the step one, a plurality of vertical through openings are provided at equal intervals along the width of the river on the top of the I-beam, which are located in the center of the I-beam. After the two ends of the I-beam are fixed, a plurality of supporting piles are vertically inserted into the plurality of openings one by one, and the bottom ends of the supporting piles are inserted into the foundation.

[0037] The top outer wall of the I-beam 3 is provided with a plurality of equally spaced rectangular openings, into which support piles 4 are inserted. The two ends of the I-beam 3 are fixed in the river bank 1, and the bottom ends of the support piles 4 are inserted in the foundation, thereby improving the stability of the I-beam 3.

[0038] In another technical solution, Figure 4 As shown, in step 2 and step 3, the pile group 1 and pile group 2 have the same structure and both include a pile seat and a pair of steel piles located in the pile seat. The rear side of the pile seat is in contact with the Larsen steel sheet pile, and the front side is provided with a pair of arc-shaped grooves. A pair of steel columns are clamped in the pair of arc-shaped grooves. The bottom ends of the pair of steel columns are vertically inserted into the foundation to fix the pile seat, thereby fixing the entire pile group 1 5 or pile group 2 6.

[0039] Pile Group 1 5 and Pile Group 2 6 share the same structure, primarily consisting of two steel piles 9 and a pile seat 8. One side of the pile seat 8 mates with the Larsen steel sheet pile 2, while the other side features two arcuate slots. The two steel piles 9 snap into these slots, conveniently securing the pile seat 8 to the steel piles 9. The bottoms of Pile Group 2 6 and Pile Group 1 5 are inserted into the foundation, protecting the joints of the Larsen steel sheet piles 2. Furthermore, multiple Pile Groups 1 5 and 2 6, combined with the I-beam 3 and support assembly 7, effectively support the Larsen steel sheet piles 2, significantly improving the impact resistance of the joints.

[0040] In another technical solution, Figure 2 As shown, in the step three, before installing the Nerarsen steel sheet pile group, a plurality of support assemblies are provided on the web of the I-beam in a one-to-one correspondence with the plurality of pile groups 2. After the Nerarsen steel sheet pile group is installed, the support assemblies are in one-to-one contact with and against the plurality of pile groups 2.

[0041] The I-beam 3 is equipped with multiple support assemblies 7, which assist in supporting the two sets of Larsen steel sheet piles. The I-beam 3 directly contacts the recessed portion of the Larsen steel sheet piles 2, while the support assemblies 7 primarily contact the raised portion of the Larsen steel sheet piles 2, effectively supporting the two sets of Larsen steel sheet piles. The coordination between the I-beam 3, support assemblies 7, pile groups 1 5, and pile groups 2 6 enhances the integrity of the two sets of Larsen steel sheet piles 2, effectively supporting the Larsen steel sheet piles 2 and preventing local deformation of the Larsen steel sheet piles 2.

[0042] In another technical solution, Figure 3As shown, the support assembly 7 includes a sliding seat 71 with a T-shaped cross-section, a clamping seat 73, and a drive mechanism disposed within the clamping seat. The sliding seat is slidably connected to the clamping seat. The drive mechanism includes a rotating rod 76, a worm 75 integrally connected to the rotating rod, a worm wheel 74 meshing with the worm, and a threaded rod 72 connected to the center of the worm wheel. The rotating rod drives the rotation. One end of the threaded rod is fixedly connected to the center of the worm wheel, and the other end is threadedly connected to the center of the sliding seat. A threaded channel is provided in the center of the sliding seat. The sliding seat contacts and abuts against the second pile group 6, and the clamping seat is connected to the I-beam 3. In the initial state, the sliding seat is driven to move toward the side of the rotating rod. After the installation of the Nerarsen steel sheet pile group in step 3 is completed, multiple second pile groups are installed. Then, the rotating rod is driven to rotate, which drives the sliding seat toward pile group 2 until it abuts against pile group 2.

[0043] The clamping seat is fixedly connected to a connecting seat 77 on the other side of the connecting sliding seat. Sliding blocks 78 are provided on both the upper and lower surfaces of the connecting seat. A pair of slide grooves are provided on the flanges of the I-beam 3, and the upper and lower sliding blocks are slidably connected to the pair of slide grooves. During step 2, the multiple support assemblies are slid from the ends of the pair of slide grooves to between the flanges of the I-beam using the upper and lower sliding blocks, and are initially positioned to the set positions of the multiple pile groups 2. In step 3, when installing the Nerarsen steel sheet pile groups, the upper and lower sliding blocks can be used to adaptively adjust the position of the support assemblies according to the installation situation, so that the support assemblies are located within the inner cavity of the steel sheet pile group corresponding to pile group 2.

[0044] The supporting assembly 7 mainly comprises a clamping seat and a sliding seat. The cross section of the sliding seat is a T-shaped structure, and one end of the sliding seat is in contact with the pile seat 8. A driving mechanism is provided in the clamping seat, and the driving mechanism can directly adjust the position of the sliding seat, thereby facilitating the effective support of the Larsen steel sheet pile 2. The driving mechanism comprises a threaded rod rotatably mounted in the clamping seat, the sliding seat is screwed on the outer wall of the threaded rod, one end of the threaded rod is fixedly connected to a worm gear, and the inner wall of the clamping seat is rotatably connected to a worm gear, and the worm gear and the worm gear are meshed. The inner wall of the clamping seat is rotatably mounted with a rotating rod that passes through the clamping seat, and one end of the rotating rod is connected to the worm gear. At the same time, the supporting assembly 7 is relatively independent and can adjust the position of the sliding seat according to actual conditions. A clamping mechanism is provided on the clamping seat. The setting of the clamping mechanism makes it convenient to clamp the supporting assembly 7 in the groove of the I-beam 3, thereby facilitating the later disassembly of the supporting assembly 7. The clamping mechanism comprises a connecting seat, and sliding blocks are installed on the outer walls of both sides of the connecting seat, and the inner walls of both sides of the I-beam 3 are provided with sliding grooves matching the sliding blocks. During installation, the support assembly 7 is slid from the end of the chute to between the I-beams 3; during removal, the support assembly 7 is slid from between the I-beams 3 to the end of the chute. The rotation of the rotating rod can be driven by a micro motor or other feasible driving mechanism.

[0045] The adjustable support assembly 7 can adjust the supporting effect of the support assembly 7 according to actual conditions, effectively avoiding the problem that the splicing position of the Larsen steel plate is easily deformed and damaged due to the impact force of the river water, which may cause the cofferdam structure to leak in severe cases and seriously affect the construction progress.

[0046] In another technical solution, Figure 5 As shown, in step 2 and step 3, each row of Larsen steel sheet piles 2 is formed by splicing multiple Larsen steel sheet piles 2, and adjacent Larsen steel sheet piles 2 are connected to each other as a whole through the bending parts on both sides. The bending parts on both sides of the Larsen steel sheet piles 2 are provided with sealing strips. After clamping, the sealing strips located at the bending parts are interference-fitted with each other. Each row of Larsen steel sheet piles can be installed as a whole after the overall assembly is completed, or can be installed by clamping in sequence.

[0047] The connection structure is a connection part formed by bending on both sides of the Larsen steel sheet pile 2 for mutual clamping. Adjacent Larsen steel sheet piles 2 are clamped to each other through the connection part. The clamping connection method is convenient for the installation and disassembly of the Larsen steel sheet piles 2, which greatly improves the construction efficiency and facilitates the subsequent recycling and reuse of the Larsen steel sheet piles 2, greatly saving resources.

[0048] The waterproof structure includes a sealing strip arranged at the connection position of the Larsen steel sheet pile 2. When adjacent Larsen steel sheet piles 2 are clamped together through the bending part, the sealing strips located at the bending part are interference fit between each other, which greatly improves the sealing performance of the connection position of the Larsen steel sheet pile 2 and minimizes the leakage of river water through the small gap at the connection between two adjacent Larsen steel plates.

[0049] It will be understood that the present invention is described by way of some embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and embodiments. They can be fully applied to various fields suitable for the present invention, and further modifications can be easily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for installing a double-row steel sheet pile cofferdam structure, characterized in that: The cofferdam structure is set along the width of the river channel and covers a pair of riverbanks. It includes two rows of Larsen steel sheet pile groups arranged at intervals. They are arranged in a mirror image. The Larsen steel sheet pile group away from the water flow is defined as the outer Larsen steel sheet pile group, and the Larsen steel sheet pile group close to the water flow is defined as the inner Larsen steel sheet pile group. The installation method includes the following steps: Step 1: Install an I-beam at the center of the set position of the two rows of Larsen steel sheet pile groups, and fix the two ends of the I-beam to a pair of river embankments respectively; Step 2: Install an outer Larsen steel sheet pile group against the side of the I-beam away from the water flow. At the same time, multiple pile groups 1 are spaced apart in the inner cavity of the outer Larsen steel sheet pile group away from the I-beam, with the bottom ends of the piles inserted into the foundation to support the outer Larsen steel sheet pile group; the flange plate of the I-beam contacts and abuts against the concave portion of the outer Larsen steel sheet pile group away from the I-beam; Step 3: Install an inner Larsen steel sheet pile group against the water flow side of the I-beam, and at the same time, set a plurality of pile groups 2 in the inner cavity of the Larsen steel sheet pile group between the inner Larsen steel sheet pile group and the I-beam, with their bottom ends inserted into the foundation to support the inner Larsen steel sheet pile group; the I-beam flange plate contacts and abuts against the concave portion of the inner Larsen steel sheet pile group facing the I-beam; before installing the inner Larsen steel sheet pile group, a plurality of support assemblies are provided on the web of the I-beam in a one-to-one correspondence with the corresponding positions of the plurality of pile groups 2. After the inner Larsen steel sheet pile group is installed, the support assemblies are in one-to-one contact and abut against the plurality of pile groups 2; Among them, the I-beam connects two rows of Larsen steel sheet pile groups to form a whole, and multiple pile groups 1 and multiple pile groups 2 are staggered with each other; in step 2 and step 3, the pile group 1 and pile group 2 have the same structure and both include a pile seat and a pair of steel piles located in the pile seat, the rear side of the pile seat is fitted with the Larsen steel sheet pile, and the front side is provided with a pair of arc grooves, a pair of steel columns are clamped in the pair of arc grooves, and the bottom ends of the pair of steel columns are vertically inserted into the foundation to fix the pile seat.

2. The installation method of the double-row steel sheet pile cofferdam structure according to claim 1, characterized in that: In the step one, a plurality of vertical through openings are provided at equal intervals along the width of the river channel on the top of the I-beam, which are located in the center of the I-beam. After both ends of the I-beam are fixed, a plurality of supporting piles are vertically inserted into the plurality of openings one by one, and the bottom ends of the supporting piles are inserted into the foundation.

3. The installation method of the double-row steel sheet pile cofferdam structure according to claim 1, characterized in that: The support assembly includes a sliding seat with a T-shaped cross-section, a clamping seat and a driving mechanism arranged in the clamping seat, the sliding seat is slidably connected to the clamping seat, and the driving mechanism includes a rotating rod, a worm connected to the rotating rod as a whole, a worm gear meshed with the worm, and a threaded rod connected to the center of the worm gear, the rotating rod drives the rotation, one end of the threaded rod is fixedly connected to the center of the worm gear, and the other end is threadedly connected to the center of the sliding seat, a threaded channel is provided in the center of the sliding seat, the sliding seat contacts and tightly abuts the pile group 2, and the clamping seat is connected to the I-beam; in the initial state, the sliding seat is driven to move close to the side of the rotating rod, and after the installation of the Nerarsen steel sheet pile group in step three is completed, multiple pile groups 2 are installed, and then the rotating rod is driven to rotate to push the sliding seat toward pile group 2 until it is tightly abuts pile group 2.

4. The installation method of the double-row steel sheet pile cofferdam structure according to claim 3, characterized in that: The clamping seat is fixedly connected to the connecting seat relative to the other side of the connecting sliding seat, and sliding blocks are provided on the upper and lower sides thereof. A pair of slide grooves are relatively provided on the pair of flange plates of the I-beam, and the upper and lower sliding blocks are slidably connected to the pair of slide grooves; while constructing step 2, multiple support assemblies are slid from the two ends of the pair of slide grooves to between the pair of flange plates of the I-beam through the upper and lower sliding blocks, and are initially positioned to the set positions of multiple pile groups two; in step 3, when installing the Larsen steel sheet pile group, the position of the support assembly is adaptively adjusted by sliding the upper and lower sliding blocks according to the installation situation, so that the support assembly is located in the inner cavity of the steel sheet pile group corresponding to pile group two.

5. The installation method of the double-row steel sheet pile cofferdam structure according to claim 1, characterized in that: In step 2 and step 3, each row of Larsen steel sheet pile groups is formed by splicing multiple Larsen steel sheet piles, and adjacent Larsen steel sheet piles are connected to each other as a whole through the bending parts on both sides. The bending parts on both sides of the Larsen steel sheet piles are provided with sealing strips. After the clamping, the sealing strips located at the bending parts are interference-fitted with each other. After the overall assembly of each row of Larsen steel sheet pile groups is completed, they are installed as a whole or clamped and installed in sequence.

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