High-stability double-row steel sheet pile cofferdam mechanism for river mud layer

Abstract

The invention relates to the technical field of river channel cofferdams, and discloses a high-stability double-row steel sheet pile cofferdam mechanism for a river channel sludge layer, the high-stability double-row steel sheet pile cofferdam mechanism comprises a plurality of steel sheet pile main bodies, storage grooves are fixedly formed in the other sides of two inclined supporting piles, and supporting base plates are rotatably connected to the bottoms of the inner walls of the two storage grooves; the outer walls of one ends of the two connecting rods are both sleeved with second connecting frames, and the other sides of the two supporting base plates are fixedly provided with a plurality of barb cones at equal intervals, the inclined supporting piles are supported at the inner edge of the inner side steel sheet pile body, and the supporting base plates in the containing grooves in one sides of the inclined supporting piles are rotated so that the supporting base plates can be supported in ground sludge; the barb cone is inserted into the ground sludge, the barb cone is inserted into the sludge to assist the supporting base plate in making contact with the ground so as to be matched with the inclined supporting pile to stably support the inner edge of the inner side steel sheet pile body, the first fixing bolt is removed, the connecting rod can be folded, and then the supporting base plate is stored in the storage groove; and the stability of the cofferdam mechanism is improved, and meanwhile, the transportation and storage convenience of the equipment is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of river cofferdams, and specifically relates to a double-row steel sheet pile cofferdam mechanism for a highly stable river silt layer. Background Technology

[0002] Steel sheet piles, as a unique steel structure, are equipped with linkage devices at their edges. These devices allow for free combination, ingeniously forming continuous and tight retaining or water-retaining walls. They play a crucial role in numerous engineering fields. Traditional double-row steel sheet pile cofferdams, to ensure structural integrity, typically use through-type components such as tie rods to connect the front and rear rows of piles. This design makes double-row steel sheet pile cofferdams widely applicable, suitable for silt excavation in river water conservancy construction projects, providing a stable working space for excavation; and also for hydraulic barriers in water conservancy projects, effectively resisting the impact of water flow.

[0003] With the vigorous development of modern water conservancy engineering technology, the functional requirements for double-row steel sheet pile cofferdam mechanisms are also increasing. Today, it is not only expected that they have basic soil and water retention functions, but also that they can be more efficient in use and more convenient in installation, so as to adapt to the ever-changing engineering needs and speed up the construction progress.

[0004] However, the existing double-row sheet pile cofferdam structure for river silt layers still has the following drawbacks in use:

[0005] 1. Existing double-row sheet pile cofferdam structures for river channels mainly rely on direct contact between the sheet piles and the riverbed silt surface for support. However, when the area of ​​operation is a section with a wide riverbank, the inner sheet piles often cannot directly contact the silt surface or the riverbank, thus failing to obtain effective support. If ordinary inclined bracing equipment is used for inclined support, due to the complex and diverse terrain along the riverbank, the contact angle between the inclined bracing equipment and the ground is difficult to adjust flexibly according to the actual situation. Moreover, when the contact between the inclined bracing equipment and the ground is insufficient, it will significantly reduce the support effect of the cofferdam structure, thereby seriously affecting the overall stability of the cofferdam structure and posing safety hazards to the construction project.

[0006] 2. In existing sheet pile cofferdam structures, when sheet piles are spliced ​​together, uneven settlement of the upper and lower layers of silt can cause variations in the pressure on the outer sheet piles. This pressure difference alters the contact between the less stressed and more stressed areas of the sheet piles, reducing the sealing performance of the splice and leading to leakage. Leakage not only affects the effectiveness of the cofferdam structure but also reduces the sealing quality of the sheet pile cofferdam, adversely impacting the smooth progress of the project and the surrounding environment.

[0007] Therefore, it is necessary to invent a double-row steel sheet pile cofferdam mechanism with high stability of river silt layer to solve the above problems. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a double-row steel sheet pile cofferdam mechanism for highly stable river silt layers, thereby solving the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a double-row steel sheet pile cofferdam mechanism for a highly stable river silt layer, comprising multiple steel sheet pile bodies, wherein a diagonal bracing mechanism, a fixing component, and a reinforcing and sealing mechanism are respectively provided between the multiple steel sheet pile bodies, wherein the multiple steel sheet pile bodies are arranged and installed in an inner and outer arrangement;

[0010] The inclined bracing mechanism includes multiple inclined bracing piles installed at the outer edges of multiple inner sheet pile bodies. A first connecting frame is fixedly provided on one side of two sheet pile bodies and on one side of two inclined bracing piles. A support cylinder is rotatably connected to the inner wall of the two first connecting frames located on one side of the two sheet pile bodies. A receiving groove is fixedly provided on the other side of each of the two inclined bracing piles. A connecting rod is rotatably connected to one side of the inner wall of each of the two receiving grooves. A first fixing bolt is threadedly connected to the middle position of each of the two connecting rods. A support pad is rotatably connected to the bottom of the inner wall of each of the two receiving grooves. A second connecting frame is fitted onto the outer wall of one end of each of the two connecting rods. A first limiting groove is opened on one side of each of the two support pads, and the outer wall of one end of each of the two second connecting frames is slidably connected to the inner wall of each of the two first limiting grooves. Multiple barbed cones are fixedly provided at equal intervals on the other side of each of the two support pads.

[0011] Preferably, the inner walls of the two first connecting frames located on one side of the inclined support pile are rotatably connected to support shafts, and the outer walls of the two support shafts are respectively inserted into the inner walls of the two support cylinders. A connecting groove is opened on one side of the outer wall of the two support cylinders, and a second fixing bolt is threaded through the inner wall of the two connecting grooves on one side of the two support shafts respectively.

[0012] Preferably, the fixing component includes multiple fixing sleeves sleeved between the outer walls of two adjacent sheet pile bodies, and each fixing sleeve has a second limiting groove at the middle position of its bottom.

[0013] Preferably, each of the two ends of the inner wall of the second limiting groove is slidably connected with a locking plate, each of the two ends of one side of the locking plate is fixedly provided with a protrusion, each of the two ends of the inner wall of the fixing sleeve is fixedly provided with a spring, and the two ends of the other side of each locking plate are respectively fixedly connected to one end of two springs.

[0014] Preferably, each of the sheet pile bodies is fixed with a connecting strip at both ends, and each fixing sleeve is respectively fitted between the outer walls of the two connecting strips. Two grooves are opened on one side edge of each connecting strip, and the outer wall of one end of each protrusion is respectively inserted and connected to the inner wall of each groove.

[0015] Preferably, the reinforcement and sealing mechanism includes multiple mounting frames fixed between the inner and outer steel sheet pile bodies, and the inner wall of each mounting frame is fixedly connected with a support arm beam by screws. Two connecting blocks are connected between one end of the multiple support arm beams by screws.

[0016] Preferably, a support truss is interspersed between the inner walls of the two connecting blocks, and a reinforcing beam is fixedly connected to both sides of the support truss by screws, and one end of each reinforcing beam is fixedly connected to one side of each support arm beam by screws.

[0017] Preferably, threaded holes are provided at the middle position of the support truss and on both sides of the two connecting blocks, and the support truss and the two connecting blocks are connected by screws and threaded holes.

[0018] The technical effects and advantages of this invention are as follows:

[0019] 1. This invention uses a bracing mechanism to support the inner edge of the inner sheet pile body via bracing piles. The bracing piles are rotatably connected to the sheet pile body and the first connecting frame on the bracing piles via a support cylinder and a support shaft. After the bracing piles are connected, they are inserted into the silt on the side of the river channel. At this time, the support pad in the storage groove on one side of the bracing pile is rotated to support it in the silt. After the support pad is supported on the ground, the barbed cone on its side will also be inserted into the silt. The inclination direction of the barbed cone is consistent with the direction of the force on the support pad. The barbed cone will stably penetrate into the silt to assist the support pad in contact with the ground, thereby cooperating with the bracing pile to stably support the inner edge of the inner sheet pile body. After the support pad is supported, the first fixing bolt on the connecting rod can be tightened to fix the connecting rod. During disassembly, storage or transportation, the first fixing bolt can be released to fold the connecting rod and store the support pad in the storage groove, which is convenient for transportation and stacking, improves the stability of the cofferdam mechanism and also improves the convenience of equipment transportation and storage.

[0020] 2. This invention incorporates a reinforced sealing mechanism. During the support process, the inclined support beam of the mechanism provides vertical support to both the inner and outer sheet piles. This ensures that after the sheet pile body is engaged, the vertical support prevents large gaps even with significant differences in vertical force during uneven silt settlement, thus improving the sealing effect of the sheet pile cofferdam. Furthermore, the installation distance between the inner and outer sheet piles can be adjusted by rotating the support beam on the installation frame and then fixing it with screws, according to geographical requirements. This facilitates installation and connection in different spaces, and can be adjusted even in small construction spaces to adapt to different installation and construction environments.

[0021] 3. This invention uses a fixing component to clamp the fixing sleeve between the outer walls of two adjacent sheet pile bodies. The mating strip at the edge of the clamping strip presses against the protrusion on one side of the clamping plate, causing the clamping plate to compress the spring and press the clamping plate between the outer walls of the mating strip. This makes it difficult for the sheet pile bodies to shake and ensures good contact, allowing the sheet piles to maintain high stability during the cofferdam process. At the same time, the higher contact makes the sealing better.

[0022] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

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

[0024] Figure 1 This is a schematic diagram of the entire invention;

[0025] Figure 2 This is a schematic diagram of the high-level support of the inclined bracing pile of the present invention;

[0026] Figure 3 This is a schematic diagram of the low-point support of the inclined bracing pile of the present invention;

[0027] Figure 4 This is a schematic diagram of the connection between the inclined bracing pile and the support cylinder of the present invention;

[0028] Figure 5 This is a schematic diagram of the connection between the storage slot and the support pad of the present invention;

[0029] Figure 6 This is an appendix to the specification of this invention. Figure 3 An enlarged schematic diagram of point A in the middle;

[0030] Figure 7 This is a schematic diagram of the entire fixing sleeve of the present invention;

[0031] Figure 8 This is an appendix to the specification of this invention. Figure 2 An enlarged diagram of point B in the middle;

[0032] Figure 9 This is a schematic diagram of the reinforced sealing mechanism of the present invention;

[0033] Figure 10 This is a schematic diagram of the support truss of the present invention.

[0034] In the diagram: 1. Sheet pile body; 2. Diagonal bracing mechanism; 201. Diagonal bracing pile; 202. First connecting frame; 203. Support cylinder; 204. Storage groove; 205. Connecting rod; 206. First fixing bolt; 207. Support pad; 208. Second connecting frame; 209. First limiting slide groove; 210. Barbed cone; 211. Support shaft; 212. Connecting groove; 213. Second fixing bolt; 3. Fixing component; 301. Fixing sleeve; 302. Second limiting slide groove; 303. Clamping plate; 304. Protrusion; 305. Spring; 306. Connecting strip; 307. Groove; 4. Reinforcing and sealing mechanism; 401. Mounting frame; 402. Support arm beam; 403. Connecting block; 404. Support truss; 405. Reinforcing beam; 406. Threaded hole. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This invention provides, for example Figure 1-10 The double-row steel sheet pile cofferdam mechanism for a highly stable river silt layer is shown, comprising multiple steel sheet pile bodies 1. The mechanism is characterized in that: a diagonal bracing mechanism 2, a fixing component 3, and a reinforcing and sealing mechanism 4 are respectively provided between the multiple steel sheet pile bodies 1, wherein the multiple steel sheet pile bodies 1 are arranged and installed in an inner and outer manner.

[0037] The diagonal bracing mechanism 2 includes multiple diagonal bracing piles 201 installed on the outer edges of multiple inner sheet pile bodies 1. First connecting frames 202 are fixedly provided on one side of two sheet pile bodies 1 and on one side of two diagonal bracing piles 201. Support cylinders 203 are rotatably connected to the inner walls of the two first connecting frames 202 located on one side of the two sheet pile bodies 1. Receiving grooves 204 are fixedly provided on the other side of each of the two diagonal bracing piles 201. Connecting rods 205 are rotatably connected to one side of the inner walls of each of the two receiving grooves 204. First fixing bolts 206 are threadedly connected to the middle positions of the two connecting rods 205. Support pads 207 are rotatably connected to the bottom of the inner walls of each of the two receiving grooves 204. Second connecting frames 208 are fitted onto the outer walls of one end of each of the two connecting rods 205. First limiting grooves 209 are opened on one side of each of the two support pads 207, and the outer walls of one end of each of the two second connecting frames 208 are respectively... The two first limiting grooves 209 are slidably connected to the inner walls of the two supporting pads 207. Multiple barbed cones 210 are fixed at equal intervals on the other side. Before installing the steel sheet piles to build the cofferdam, the steel sheet pile cofferdam needs to be laid out to determine the center line of the island and the width edge of the double-row steel sheet pile cofferdam. Limiting devices are installed to strictly control its planar position and bidirectional verticality to meet the design requirements. At the same time, this design scheme strictly follows the construction steps of "building the island first and then driving the piles" during use. During the island construction process, the pit needs to be backfilled and compacted in layers until it is consistent with the elevation of the surrounding ground. The island is constructed and filled by advancing along the center line of the laid-out axis. Soil is transported by dump trucks and leveled by bulldozers from one side to the other. After the construction of the double-row steel sheet piles is completed, the soil is filled again in the steel sheet pile cofferdam, filled, leveled and compacted in layers, and the overall leveling is controlled by the elevation. For the earthwork near the double-row steel sheet piles, use a frog rammer or small rammer to compact and fill it in layers to the water surface, until it is filled to the other end of the cofferdam.

[0038] When using, please refer to the instruction manual. Figure 1-3As shown, the sheet pile bodies 1 are joined together and installed in an inner and outer distribution. When used for river damming and siltation, the outer sheet pile cofferdam will be subjected to strong impact force. At this time, the inner sheet pile body 1 is supported by the inclined bracing piles 201 at the inner edge of the inner sheet pile body 1, and is rotatably connected by the support cylinder 203 and the support shaft 211 through the first connecting frame 202 on the sheet pile body 1 and the inclined bracing pile 201. After the inclined bracing piles 201 are joined together, they are inserted into the silt on the side of the river. At this time, the support pad 207 in the receiving groove 204 on one side of the inclined bracing pile 201 is rotated to support it in the silt on the ground. After the support pad 207 is supported on the ground, the barbed cones 210 on its side will also insert into the silt. The barbed cone 210 is inserted into the silt on the ground, and the tilt direction of the barbed cone 210 is consistent with the direction of the force on the support pad 207. The barbed cone 210 will stably penetrate into the silt to assist the support pad 207 in contact with the ground, and then cooperate with the inclined bracing pile 201 to stably support the inner edge of the inner steel sheet pile body 1. After the support pad 207 is properly supported, the first fixing bolt 206 on the connecting rod 205 can be tightened to fix the connecting rod 205. During the later disassembly, storage or transportation process, the first fixing bolt 206 can be released to fold the connecting rod 205 and store the support pad 207 in the storage groove 204, which is convenient for transportation and stacking, improves the stability of the cofferdam mechanism and also improves the convenience of equipment transportation and storage.

[0039] Two first connecting frames 202 located on one side of the inclined support pile 201 are rotatably connected to the inner walls of two first connecting frames 202, and the outer walls of the two supporting shafts 211 are respectively inserted into the inner walls of the two supporting cylinders 203. A connecting groove 212 is provided on one side of the outer wall of each of the two supporting cylinders 203. A second fixing bolt 213 is threaded through the inner wall of each of the two connecting grooves 212 on one side of each of the two supporting shafts 211. The height of the inclined support surface on the rear side may vary depending on the riverbed surface environment. This can be addressed by referring to the appendix to the instruction manual. Figure 2 Included with instruction manual Figure 3 As shown, the rear diagonal bracing mechanism 2 can be adjusted to different heights through the support cylinder 203 and the support shaft 211, so that the diagonal bracing pile 201 can stably support the rear side. After support, the second fixing bolt 213 is tightened and pressed against the inner wall of the support cylinder 203, thereby fixing the support shaft 211 and the support cylinder 203.

[0040] Furthermore, the fixing component 3 includes multiple fixing sleeves 301 sleeved between the outer walls of two adjacent sheet pile bodies 1, and a second limiting groove 302 is provided at the middle position of the bottom of each fixing sleeve 301.

[0041] Each second limiting groove 302 has a slidably connected clamping plate 303 at both ends of its inner wall. Each clamping plate 303 has a protrusion 304 fixedly provided at both ends of one side. Each fixed sleeve 301 has a spring 305 fixedly provided at both ends of both sides of its inner wall. The other two ends of each clamping plate 303 are respectively fixedly connected to one end of two springs 305. After the steel sheet pile bodies 1 of the cofferdam are interlocked, the fixed sleeve 301 is clamped between the outer walls of two adjacent steel sheet pile bodies 1, so that the mating strip 306 at its edge presses the protrusion 304 on one side of the clamping plate 303, so that the clamping plate 303 compresses the spring 305, and then presses the clamping plate 303 between the outer walls of the mating strip 306, so that the steel sheet pile bodies 1 are not easy to shake and have good contact.

[0042] Furthermore, each sheet pile body 1 is fixed with a connecting strip 306 at both ends, and each fixing sleeve 301 is respectively fitted between the outer walls of the two connecting strips 306. Two grooves 307 are opened on one side edge of each connecting strip 306, and the outer wall of one end of each protrusion 304 is inserted and connected to the inner wall of each groove 307. After the fixing sleeve 301 is fitted, the protrusion 304 on one side of the clamping plate 303 is inserted into the groove 307 on the side of the connecting strip 306, thereby making the sheet pile body 1 fully contact. At the same time, the protrusion 304 sinks into the groove 307, making the fixing sleeve 301 less likely to fall off during the operation of the sheet pile body 1.

[0043] Furthermore, the reinforcing and sealing mechanism 4 includes multiple mounting brackets 401 fixed between the inner and outer sheet pile bodies 1. Each mounting bracket 401 has a support beam 402 fixedly connected to its inner wall by screws. Two connecting blocks 403 are connected to one end of each support beam 402 by screws, as shown in the attached instruction manual. Figure 9 As shown, the reinforcing and sealing mechanism 4 is installed between the inner and outer steel sheet pile bodies 1 to support the inner and outer steel sheet piles.

[0044] A support truss 404 is interlaced between the inner walls of the two connecting blocks 403. Reinforcing beams 405 are fixed to both ends of the support truss 404 with screws. One end of each reinforcing beam 405 is fixed to one side of each support arm beam 402 with screws. During the support process, the inclined support of the support arm beams 402 provides vertical support to both the inner and outer sheet piles. This ensures that after the sheet pile body 1 is engaged, the vertical support prevents large gaps even with significant differences in vertical force during uneven silt settlement, improving the sealing effect of the sheet pile cofferdam. Furthermore, the installation distance between the inner and outer sheet piles can be adjusted by rotating the support arm beams 402 on the mounting frame 401 and then fixing them with screws, facilitating installation and docking in different spaces. Even in small construction spaces, adjustments can be made to adapt to various installation environments.

[0045] Threaded holes 406 are provided at the middle position of the support truss 404 and on both sides of the two connecting blocks 403. The support truss 404 and the two connecting blocks 403 are connected by screws and threaded holes 406. The connecting blocks 403 connecting the support arm beams 402 on both sides are fixed by using the support truss 404 at the middle position of the mechanism. When fixing, the connecting blocks 403 at both ends can be stably connected by tightening the screws through the threaded holes 406 at the middle position of the support truss 404 and the threaded holes 406 on both sides of the connecting blocks 403. At the same time, the support of the mechanism on the steel sheet pile body 1 on both sides is improved. The support truss 404 is fixed on the inner and outer steel sheet pile body 1 and can be further reinforced in conjunction with the reinforcing beam 405.

[0046] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-row steel sheet pile cofferdam mechanism for a highly stable river silt layer, comprising multiple steel sheet pile bodies (1), characterized in that: The multiple sheet pile bodies (1) are respectively provided with a bracing mechanism (2), a fixing component (3) and a reinforcing and sealing mechanism (4), wherein the multiple sheet pile bodies (1) are arranged in an inner and outer arrangement; The inclined bracing mechanism (2) includes multiple inclined bracing piles (201) installed at the outer edges of multiple inner sheet pile bodies (1). A first connecting frame (202) is fixedly provided on one side of two sheet pile bodies (1) and on one side of the two inclined bracing piles (201). A support cylinder (203) is rotatably connected to the inner wall of the two first connecting frames (202) located on one side of the two sheet pile bodies (1). A receiving groove (204) is fixedly provided on the other side of each of the two inclined bracing piles (201). A connecting rod (205) is rotatably connected to one side of the inner wall of each of the two receiving grooves (204). The connecting rod (205) is threaded with a first fixing bolt (206) at the middle position. The bottom of the inner wall of the two storage slots (204) is rotatably connected with a support pad (207). The outer wall of one end of the two connecting rods (205) is fitted with a second connecting bracket (208). The first limiting groove (209) is opened on one side of the two support pads (207). The outer wall of one end of the two second connecting brackets (208) is slidably connected to the inner wall of the two first limiting grooves (209). Multiple barbed cones (210) are fixed at equal distances on the other side of the two support pads (207).

2. The double-row steel sheet pile cofferdam mechanism for a highly stable river silt layer according to claim 1, characterized in that: The inner walls of the two first connecting frames (202) located on one side of the inclined support pile (201) are rotatably connected with support shafts (211), and the outer walls of the two support shafts (211) are respectively inserted and connected to the inner walls of the two support cylinders (203). A connecting groove (212) is opened on one side of the outer wall of the two support cylinders (203), and the two support shafts (211) are respectively threaded through the inner walls of the two connecting grooves (212) and connected with second fixing bolts (213).

3. The double-row steel sheet pile cofferdam mechanism for a highly stable river silt layer according to claim 1, characterized in that: The fixing component (3) includes multiple fixing sleeves (301) sleeved between the outer walls of two adjacent sheet pile bodies (1), and a second limiting groove (302) is provided at the middle position of the bottom of each fixing sleeve (301).

4. The double-row steel sheet pile cofferdam mechanism for a highly stable river silt layer according to claim 3, characterized in that: Each of the two ends of the inner wall of the second limiting groove (302) is slidably connected with a locking plate (303), and each of the two ends of one side of the locking plate (303) is fixedly provided with a protrusion (304). Each of the two ends of the inner wall of the fixing sleeve (301) is fixedly provided with a spring (305), and the two ends of the other side of each locking plate (303) are respectively fixedly connected to one end of two springs (305).

5. The double-row steel sheet pile cofferdam mechanism for a highly stable river silt layer according to claim 4, characterized in that: Each sheet pile body (1) is fixed with a connecting strip (306) at both ends. Each fixing sleeve (301) is respectively fitted between the outer walls of the two connecting strips (306). Two grooves (307) are opened on one side edge of each connecting strip (306), and the outer wall of one end of each protrusion (304) is respectively inserted and connected to the inner wall of each groove (307).

6. The double-row steel sheet pile cofferdam mechanism for a highly stable river silt layer according to claim 1, characterized in that: The reinforcement and sealing mechanism (4) includes multiple mounting frames (401) fixed between the inner and outer steel sheet pile bodies (1). Each mounting frame (401) has a support arm beam (402) fixedly connected to its inner wall by screws. Two connecting blocks (403) are connected to one end of the multiple support arm beams (402) by screws.

7. The double-row steel sheet pile cofferdam mechanism for a highly stable river silt layer according to claim 6, characterized in that: A support truss (404) is interspersed between the inner walls of the two connecting blocks (403). Both ends of the support truss (404) are fixedly connected to a reinforcing beam (405) by screws, and one end of each reinforcing beam (405) is fixedly connected to one side of each support arm beam (402) by screws.

8. The double-row steel sheet pile cofferdam mechanism for a highly stable riverbed silt layer according to claim 7, characterized in that: The support truss (404) has threaded holes (406) at its middle position and on both sides of the two connecting blocks (403), and the support truss (404) and the two connecting blocks (403) are connected by screws and threaded holes (406).

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