CN111809639A

CN111809639A - Double-row steel sheet pile cofferdam

Info

Publication number: CN111809639A
Application number: CN202010729131.9A
Authority: CN
Inventors: 吴学向; 阮鹏; 叶城雄; 吴叶婷
Original assignee: Fujian Xinggang Construction Engineering Co ltd
Current assignee: Fujian Xinggang Construction Engineering Co ltd
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2020-10-23
Anticipated expiration: 2040-07-27
Also published as: CN111809639B

Abstract

The utility model relates to a double steel sheet pile cofferdam, slide respectively including two rows of larsen steel sheet piles, fixed connection that are parallel arrangement in the outer convex part dorsal surface of larsen steel sheet pile and the guide rail post and the both ends that are on a parallel with larsen steel sheet pile and connect in the connecting piece of guide rail post, the guide rail post sets up in the biggest deformation position department of steel sheet pile and the part is higher than on the surface of water, the guide rail post is provided with the slide that extends along the length direction of guide rail post, the connecting piece includes fixed sleeve and slides along the fixed sleeve axial and inserts the slide bar of locating fixed sleeve, slide bar are close to the tip of larsen steel sheet pile be provided with slide connect in the sliding seat of slide, fixed sleeve is provided with the regulating part of adjusting slide bar and fixed sleeve's relative sliding. This application has the displacement of the double steel sheet pile of more effective restriction and the effect of moment of flexure.

Description

Double-row steel sheet pile cofferdam

Technical Field

The application relates to the technical field of river engineering construction, in particular to a double-row steel sheet pile cofferdam.

Background

The structural form of the construction of the large cofferdam on the soft soil foundation generally comprises two types of earth-rock cofferdams and sheet pile cofferdams. The cofferdam with large volume is difficult to construct in the aspects of stability, foundation bearing capacity, seepage prevention, water stop and the like, and the construction period is long. The steel sheet pile cofferdam has small volume and small influence range, and can adopt a double-row sheet pile structure or a grid sheet pile structure. Compared with the lattice type steel sheet piles, the double-row steel sheet pile cofferdam structure has the advantages of reliable water stop, convenience in recycling and the like, and the manufacturing cost is generally only 1/3-1/2 of the lattice type steel sheet pile structure of the same scale. The cofferdam can bear larger deformation, has high construction and dismantling speed, and often becomes the preferred cofferdam form on soft soil foundations.

In the double-row steel sheet pile cofferdam structure, the steel pull rod plays a vital role in limiting the deformation of the whole structure. Under general conditions, the maximum deformation and bending moment of the steel sheet piles occur at positions close to a riverbed, but due to the limitation of construction conditions, steel pull rods are positioned at the top of the steel sheet piles above the water surface in most of the double-row steel sheet pile cofferdams at present. Therefore, the arrangement of the existing steel pull rod only has obvious limiting effect on the top position, and the stability of the whole structure is poor.

Disclosure of Invention

In order to more effectively restrict displacement and moment of flexure of double steel sheet pile, the purpose of this application provides a double steel sheet pile cofferdam.

The application provides a double steel sheet pile cofferdam adopts following technical scheme:

the utility model provides a double steel sheet pile cofferdam, includes that two rows are parallel arrangement's Larsen steel sheet pile, fixed connection and slide respectively in the guide rail post and the both ends of Larsen steel sheet pile outer convex part dorsal surface and being on a parallel with Larsen steel sheet pile and connect in the connecting piece of guide rail post, the guide rail post sets up on the guide rail post is higher than the surface of water in steel sheet pile maximum deformation position department and part, the guide rail post is provided with the slide that extends along the length direction of guide rail post, the connecting piece includes fixed sleeve and slides along the fixed sleeve axial and inserts the slide bar of locating fixed sleeve, the tip that fixed sleeve, slide bar are close to Larsen steel sheet pile be provided with slide connect in the sliding seat of slide, fixed sleeve is provided with the regulating part of adjusting slide bar.

By adopting the technical scheme, after insertion and driving of the Larsen steel sheet piles are completed, a worker adjusts the relative sliding position of the sliding rod and the fixed sleeve through the adjusting piece according to the distance between the two rows of Larsen steel sheet piles, so that the distance between the two sliding seats is matched with the distance between the two opposite guide rail columns on the two rows of Larsen steel sheet piles, then the sliding seats are installed in the slideways on the guide rail columns in a sliding manner, when the sliding seats slide to the position near the maximum deformation position of the Larsen steel sheet piles below the water surface, the sliding rod is adjusted to slide towards the direction far away from or close to the fixed sleeve through the adjusting piece, so that the outer walls of the sliding seats are abutted against the inner walls of the slideways to limit the sliding of the sliding seats, thereby realizing the installation of the connecting piece near the maximum deformation position of the steel sheet piles below the water surface, needing no, the displacement and the bending moment of the double-row steel sheet piles can be more effectively limited; on the other hand, after the connecting piece is detached, the telescopic adjustment can be carried out according to double rows of steel sheet piles with different intervals, the repeated use is realized, the utilization rate of the connecting piece is improved, and therefore the economic benefit is improved.

Preferably, the adjusting part is a threaded sleeve which is rotatably connected to one end, far away from the Larsen steel sheet pile, of the fixing sleeve, and the sliding rod is a screw rod with threads penetrating through the threaded sleeve.

Through adopting above-mentioned technical scheme, rotate the thread bush to drive the slide bar and slide along fixed sleeve's axial, realize adjusting the length of connecting piece.

Preferably, every connecting piece on the guide rail post is provided with many and distributes along the length direction of guide rail post, and wherein the connecting piece that is located the top is located on the surface of water, adjacent two be provided with between the thread bush and be used for the synchronous pivoted drive assembly of transmission thread bush, be located the top and be provided with its pivoted driving piece of drive on the thread bush.

Through adopting above-mentioned technical scheme, the connecting piece is provided with a plurality ofly and distributes along the length direction of guide rail post, on the one hand, make the connecting piece not only restrict near the maximum deformation position of steel sheet pile, also effectively restrict the larsen steel sheet pile that lies in the surface of water top, strengthen double larsen steel sheet pile overall structure's stability and reliability, effectively reduce the stormy waves and erode the possibility that leads to larsen steel sheet pile to take place to empty to larsen steel sheet pile, on the other hand, drive the thread bush through the driving piece that lies in the surface of water top and rotate, the thread bush drives the slide bar and slides along its axis direction, and simultaneously, transmission assembly is under the drive of driving piece, make the thread bush synchronous rotation on two adjacent connecting pieces, in order to reach the purpose of the length of many connecting pieces of synchronous adjustment, avoid under water to be.

Preferably, the drive assembly includes that the synchronous sprocket of thread bush and adjacent two of wraparound are located to coaxial fixed cover the synchronous chain of synchronous sprocket, wherein when the quantity of connecting piece is 2, synchronous sprocket is single sprocket, when the quantity of connecting piece exceeded 2, lies in the synchronous sprocket of the top and the below and is single sprocket, and all the other are double sprocket.

By adopting the technical scheme, the thread bush on one of the connecting pieces rotates to drive the synchronous chain wheel on the connecting piece to rotate, the synchronous chain wheel rotates to drive the synchronous chain meshed with the synchronous chain to transmit, the synchronous chain drives the other synchronous chains meshed with the synchronous chain to rotate, and the like, so that the thread bushes driving the connecting pieces on the same guide rail column synchronously rotate, and the synchronous adjustment and installation of the length sizes of the connecting pieces are realized.

Preferably, the driving part is a rotating hand wheel coaxially and fixedly sleeved on the threaded sleeve at the top.

Through adopting above-mentioned technical scheme, be provided with the rotation hand wheel, the increase rotates the moment of torsion of thread bush to the staff of being convenient for uses power still less just can rotate the thread bush, improves the simple operation nature.

Preferably, the fixed sleeve radially runs through and has seted up in the hole of permeating water, the hole of permeating water is provided with a plurality ofly and along fixed sleeve's axial distribution.

Through adopting above-mentioned technical scheme, fixed sleeve has seted up the hole of permeating water, and the slide bar that is located the surface of water below slides at the fixed sleeve hole, when the slide bar when sliding towards being close to the fixed sleeve direction, is convenient for discharge the water in the fixed sleeve through the hole of permeating water, when the slide bar slides towards keeping away from the fixed sleeve direction, the water in river course enters into to the fixed sleeve through the hole of permeating water to effectively reduce the connecting piece and take place the possibility of the dead phenomenon of card when the aquatic is adjusted.

Preferably, the sliding seat is provided with a sliding groove extending along the arrangement direction of the Larsen steel sheet piles and a sliding block connected to the sliding groove in a sliding manner, and the end parts of the sliding rod and the fixing sleeve are fixedly connected to the sliding block.

Through adopting above-mentioned technical scheme, be provided with the spout and slide and connect in the sliding block of spout, the equal fixed connection in sliding block of sliding rod and fixed sleeve's tip, make certain slippage between connecting piece and the sliding seat, thereby make to have certain compensation effect between connecting piece and the sliding seat, when guide rail post mounted position on two Lassen steel sheet piles relatively has certain deviation, adjust the slippage position between sliding block and the sliding seat of sliding rod tip or fixed sleeve tip, make the connecting piece be in the state of two perpendicular rows of Lassen steel sheet piles all the time, guarantee the effect that connecting piece mounting effect and restriction Lassen steel sheet pile warp.

Preferably, the guide rail column is provided with a limiting assembly for limiting the sliding seat to slide in a damping mode.

Through adopting above-mentioned technical scheme, be provided with spacing subassembly, when the erection joint spare, slide the sliding seat at connecting piece both ends respectively and connect in the slide of the guide rail post on the double larsen steel sheet pile, need apply the effort along the length direction of guide rail post to sliding seat or connecting piece, just can change the sliding position of sliding seat, it limits to sliding of sliding seat to need not extra effort when the staff of being convenient for adjusts the length of connecting piece, thereby liberation staff's both hands, the staff of being convenient for adjusts the length of connecting piece.

Preferably, spacing subassembly include along the Larsen steel sheet pile direction of arranging offer in the slide inner wall the installation blind hole, along the extending direction of installation blind hole slide connect in the spacing ball of installation blind hole, offer in the spacing groove of sliding seat near the side of installation blind hole and place the installation blind hole in and force spacing ball scarf joint in the spring of spacing groove, the installation blind hole is provided with a plurality ofly and follows the length direction equipartition of guide rail post, the spacing groove is provided with the multichannel and follows vertical equipartition, adjacent two the interval and the adjacent two of installation blind hole the interval of spacing groove equals, the one end fixed connection of spring is in the inner wall of locating part and other end fixed connection in installation blind hole, the spacing groove is for slotting with spacing ball matched with hemisphere, the spacing groove is along fixed sleeve's axial extension.

Through adopting above-mentioned technical scheme, the sliding seat slides and inserts when locating the slide of guide rail post, the sliding seat butt when spacing ball is global, continue to exert certain power along the length direction of guide rail post and force spacing ball compression spring, the spring has elastic potential energy, spacing ball is when corresponding with spacing groove position, the spring resets and forces the locating part to scarf joint in the spacing groove, thereby the slip of restriction sliding seat, spacing groove sets up along fixed sleeve's axial extension, make the sliding seat along fixed sleeve's axial displacement after being convenient for connecting piece regulation length after, spacing ball still butt in the spacing groove, play the limiting displacement to the sliding seat, further improve overall structure's stability.

Preferably, impermeable cloth is laid on the upstream face of the Larsen steel sheet pile.

By adopting the technical scheme, the anti-seepage cloth is arranged, when the river water in the double-row Larsen steel sheet pile cofferdam is subsequently pumped by the water pump, the anti-seepage cloth can prevent the extra river water of the cofferdam from permeating into the cofferdam cells, and the pumping efficiency is improved.

In summary, the present application includes at least one of the following beneficial technical effects:

the two ends of the connecting piece are provided with sliding seats connected with the slide way in a sliding mode, the connecting piece is slid to the position near the maximum deformation position under the water surface of the double-row Larsen steel sheet pile, the sliding rod is adjusted by the adjusting piece to slide towards the direction far away from or close to the fixed sleeve, the outer wall of the sliding seat is enabled to abut against the inner wall of the slide way, sliding of the sliding seat is limited, and therefore the connecting piece is installed near the maximum deformation position of the steel sheet pile under the water surface, sliding limitation of the sliding seat by additional fasteners is not needed, operation is convenient and fast, and compared with a traditional steel pull rod structure, displacement and bending moment;

after the connecting piece is detached, telescopic adjustment can be performed according to double rows of steel sheet piles with different intervals, so that repeated use is realized, the utilization rate of the connecting piece is improved, and the economic benefit is improved;

the connecting pieces are arranged in a plurality and are distributed along the length direction of the guide rail column, on one hand, the connecting pieces are enabled to limit the positions near the maximum deformation positions of the steel sheet piles and effectively limit the Larsen steel sheet piles above the water surface, the stability and reliability of the overall structure of the double-row Larsen steel sheet piles are enhanced, the possibility that the Larsen steel sheet piles are toppled due to the fact that the Larsen steel sheet piles are washed by wind waves is effectively reduced, on the other hand, the driving pieces above the water surface are used for driving the threaded sleeves to rotate, the threaded sleeves drive the sliding rods to slide along the axial direction of the sliding rods, and meanwhile, the transmission assembly is driven by the driving pieces to enable the threaded sleeves on two adjacent connecting pieces to rotate synchronously, so that the purpose of synchronously adjusting the lengths of the connecting pieces;

be provided with the spout and slide and connect in the sliding block of spout, the equal fixed connection in sliding block of slide bar and fixed sleeve's tip, make certain slippage between connecting piece and the sliding seat, thereby make to have certain compensation effect between connecting piece and the sliding seat, when guide rail post mounted position on two Larsen steel sheet piles relatively has certain deviation, adjust the slippage position between sliding block and the sliding seat of slide bar tip or fixed sleeve tip, make the connecting piece be in the state of two perpendicular rows of Larsen steel sheet piles all the time, guarantee the effect that connecting piece mounted effect and restriction Larsen steel sheet pile warp.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a double-row steel sheet pile cofferdam;

fig. 2 is a schematic view of a connection structure between two opposite tension steel sheet piles;

FIG. 3 is a schematic view of the internal structure of the guide rail column;

FIG. 4 is an enlarged partial schematic view of FIG. 3 at A;

FIG. 5 is a schematic view of the structure of the connector;

fig. 6 is a schematic structural view of the transmission assembly.

Description of reference numerals: 1. larsen steel sheet piles; 2. a guide rail column; 21. a slideway; 22. a sliding seat; 221. a chute; 222. a slider; 3. a connecting member; 31. fixing the sleeve; 311. water permeable holes; 32. a slide bar; 33. a threaded sleeve; 34. a drive member; 35. a transmission assembly; 351. a synchronous sprocket; 352. a synchronization chain; 4. river banks; 5. a limiting component; 51. installing blind holes; 52. a limiting ball; 53. a spring; 54. a limiting groove.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses double steel sheet pile cofferdam refers to fig. 1, fig. 2, and include two rows of Larsen steel sheet piles 1 that arrange and be parallel arrangement along river course width direction, fixed connection in the guide rail post 2 that 1 outer convex part dorsal surface of Larsen steel sheet pile just is on a parallel with Larsen steel sheet pile 1 and both ends slide respectively and connect in the connecting piece 3 of guide rail post 2. The ends of the two rows of Larsen steel sheet piles 1 are abutted against the river bank 4, the connecting pieces 3 on each guide rail column 2 are provided with a plurality of connecting pieces and distributed along the length direction of the guide rail column 2, the connecting piece 3 positioned at the uppermost part is positioned above the water surface, and impermeable cloth is laid on the upstream surface of the Larsen steel sheet piles 1.

Referring to fig. 2 and 3, the guide rail column 2 is disposed at the maximum deformation position of the steel sheet pile and partially above the water surface, the upper portion of the guide rail column 2 is open, the guide rail column 2 is provided with a slide rail 21 extending along the length direction of the guide rail column 2 and a sliding seat 22 connected to the slide rail 21 in a sliding manner, and the sliding seat 22 is in clearance fit with the slide groove 221. The sliding seat 22 can be installed in the slide rail 21 along the opening of the guide rail column 2, the sliding seat 22 is provided with a sliding groove 221 extending along the arrangement direction of the Larsen steel sheet piles 1 and a sliding block 222 connected to the sliding groove 221 in a sliding manner, and the sliding seat 22 is partially hollow, so that on one hand, the weight of the sliding seat 22 is reduced, the convenience in installing the connecting piece 3 is increased, and on the other hand, the buoyancy provided by water to the sliding seat 22 is increased.

Referring to fig. 3 and 4, the guide rail column 2 is provided with a limiting component 5 which limits the sliding of the sliding seat 22 in a damping mode. The limiting assembly 5 comprises a blind mounting hole 51 formed in the inner wall of the slideway 21 along the arrangement direction of the Larsen steel sheet piles 1, a limiting ball 52 connected to the blind mounting hole 51 in a sliding manner along the extending direction of the blind mounting hole 51, a limiting groove 54 formed in the side surface of the sliding seat 22 close to the blind mounting hole 51, and a spring 53 arranged in the blind mounting hole 51 and forcing the limiting ball 52 to be embedded in the limiting groove 54. The installation blind holes 51 are provided with a plurality of length direction equipartitions along the guide rail column 2, the limiting grooves 54 are provided with a plurality of channels and along vertical equipartitions, and the interval of two adjacent installation blind holes 51 equals to the interval of two adjacent limiting grooves 54. One end of the spring 53 is fixedly connected to the limiting member and the other end is fixedly connected to the inner wall of the installation blind hole 51, the limiting groove 54 is a hemispherical groove matched with the limiting ball 52, and the limiting groove 54 extends along the axial direction of the fixing sleeve 31.

Referring to fig. 2 and 5, the connecting member 3 includes a fixing sleeve 31 and a sliding rod 32 slidably inserted in the fixing sleeve 31 along the axial direction of the fixing sleeve 31, the fixing sleeve 31 is radially penetrated and communicated with a water permeable hole 311, the water permeable hole 311 is provided with a plurality of holes and axially distributed along the fixing sleeve 31, and the ends of the fixing sleeve 31 and the sliding rod 32 close to the larsen steel sheet pile 1 are fixedly connected to the sliding block 222. The fixed sleeve 31 is provided with an adjusting piece for adjusting the relative sliding position of the sliding rod 32 and the fixed sleeve 31, the adjusting piece is a threaded sleeve 33 which is rotatably connected to one end of the fixed sleeve 31 far away from the Larsen steel sheet pile 1, and the sliding rod 32 is a screw rod with threads penetrating through the threaded sleeve 33.

Referring to fig. 2 and 6, a transmission assembly 35 for transmitting the synchronous rotation of the threaded sleeves 33 is arranged between two adjacent threaded sleeves 33 on the same guide rail column 2, and a driving member 34 for driving the threaded sleeves 33 to rotate is arranged on the uppermost threaded sleeve 33. The transmission assembly 35 includes the synchronous sprocket 351 of the threaded sleeve 33 and the synchronous chain 352 of two adjacent synchronous sprockets 351 of wraparound are located to the coaxial fixed cover, wherein when the quantity of connecting piece 3 is 2, synchronous sprocket 351 is the single-row sprocket, when the quantity of connecting piece 3 exceeded 2, the synchronous sprocket 351 that is located the top and the bottom was the single-row sprocket, and all the other is double-row sprocket, and the synchronous chain 352 that connects on two adjacent synchronous sprockets 351 is the staggered distribution. The driving piece 34 is the rotation hand wheel of the threaded sleeve 33 of the top is located to the coaxial fixed cover, and the increase rotates the moment of torsion of threaded sleeve 33 to the staff of being convenient for uses power still less just can rotate threaded sleeve 33, improves the simple operation nature.

The application principle of the double-row steel sheet pile cofferdam of the embodiment of the application is as follows: after insertion and driving of the Larsen steel sheet piles 1 are finished, welding the guide rail columns 2 on the Larsen steel sheet piles 1, enabling a worker to rotate the threaded sleeves 33 according to the distance between the two rows of Larsen steel sheet piles 1 so as to adjust the relative sliding positions of the sliding rods 32 and the fixing sleeves 31, enabling the distance between the two sliding seats 22 to be matched with the distance between the two opposite guide rail columns 2 on the two rows of Larsen steel sheet piles 1, then sliding and installing the sliding seats 22 in the slideways 21 on the guide rail columns 2, continuously applying a certain force along the length direction of the guide rail columns 2 to force the limiting balls 52 to compress the springs 53, enabling the springs 53 to have elastic potential energy, when the positions of the limiting balls 52 and the limiting grooves 54 correspond, resetting the springs 53 to force the limiting pieces to be embedded in the limiting grooves 54, thereby limiting the sliding of the sliding seats 22 when the sliding seats 22 slide to the position near the maximum deformation position of the Larsen steel sheet, then, a rotating hand wheel on the uppermost threaded sleeve 33 is rotated, the plurality of sliding rods 32 are synchronously adjusted through the transmission assembly 35 to slide towards the direction far away from or close to the fixed sleeve 31, so that the outer wall of the sliding seat 22 abuts against the inner wall of the slideway 21, the sliding of the sliding seat 22 is further limited, the operation is convenient, and compared with the traditional steel pull rod structure, the displacement and the bending moment of the double-row steel sheet pile can be more effectively limited; on the other hand, after the connecting piece 3 is detached, the telescopic adjustment can be carried out according to double rows of steel sheet piles with different intervals, the repeated use is realized, the utilization rate of the connecting piece 3 is improved, and therefore the economic benefit is improved.

The sliding rod 32 and the end part of the fixed sleeve 31 are fixedly connected to the sliding block 222, so that a certain sliding amount exists between the connecting piece 3 and the sliding seat 22, and a certain compensation effect exists between the connecting piece 3 and the sliding seat 22, when a certain deviation amount exists between the installation positions of the guide rail columns 2 on the two Larsen steel sheet piles 1, the sliding position between the sliding block 222 at the end part of the sliding rod 32 or the end part of the fixed sleeve 31 and the sliding seat 22 is adjusted, so that the connecting piece 3 is always in a state of being perpendicular to the two rows of Larsen steel sheet piles 1, and the installation effect of the connecting piece 3 and the effect of limiting the deformation of the Larsen steel sheet piles 1 are ensured.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a double steel sheet pile cofferdam which characterized in that: comprises two rows of Larsen steel sheet piles (1) which are arranged in parallel, a guide rail column (2) which is fixedly connected with the back surface of the outer convex part of the Larsen steel sheet pile (1) and is parallel to the Larsen steel sheet pile (1), and connecting pieces (3) of which the two ends are respectively connected with the guide rail column (2) in a sliding way, the guide rail column (2) is arranged at the maximum deformation position of the steel sheet pile and is partially higher than the water surface, the guide rail column (2) is provided with a slideway (21) extending along the length direction of the guide rail column (2), the connecting piece (3) comprises a fixed sleeve (31) and a sliding rod (32) which is inserted in the fixed sleeve (31) in a sliding way along the axial direction of the fixed sleeve (31), the end parts of the fixed sleeve (31) and the sliding rod (32) close to the Larsen steel sheet pile (1) are provided with sliding seats (22) connected with the slide ways (21) in a sliding way, the fixed sleeve (31) is provided with an adjusting piece for adjusting the relative sliding position of the sliding rod (32) and the fixed sleeve (31).

2. The double-row steel sheet pile cofferdam of claim 1, wherein: the adjusting piece is a threaded sleeve (33) which is rotatably connected to one end, far away from the Larsen steel sheet pile (1), of the fixing sleeve (31), and the sliding rod (32) is a screw rod with threads penetrating through the threaded sleeve (33).

3. The double-row steel sheet pile cofferdam of claim 2, wherein: every connecting piece (3) on guide rail post (2) are provided with many and distribute along the length direction of guide rail post (2), and wherein lie in on connecting piece (3) of the top are in the surface of water, adjacent two be provided with between thread bush (33) and be used for transmission thread bush (33) synchronous pivoted drive assembly (35), lie in and be provided with its pivoted driving piece (34) of drive on thread bush (33) of the top.

4. The double-row steel sheet pile cofferdam of claim 3, wherein: drive assembly (35) including coaxial fixed cover locate synchronous sprocket (351) of thread bush (33) and adjacent two of wraparound synchronous chain (352) of synchronous sprocket (351), wherein when the quantity of connecting piece (3) is 2, synchronous sprocket (351) are the single sprocket, when the quantity of connecting piece (3) exceeded 2, lie in the synchronous sprocket (351) of the top and the below and be the single sprocket, and all the other are double sprocket.

5. The double-row steel sheet pile cofferdam of claim 3, wherein: the driving piece (34) is a rotating hand wheel which is coaxially and fixedly sleeved on the uppermost threaded sleeve (33).

6. The double-row steel sheet pile cofferdam of claim 1, wherein: the sliding seat (22) is provided with a sliding groove (221) extending along the arrangement direction of the Larsen steel sheet piles (1) and a sliding block (222) connected to the sliding groove (221) in a sliding mode, and the end portions of the sliding rod (32) and the fixed sleeve (31) are fixedly connected to the sliding block (222).

7. The double-row steel sheet pile cofferdam of claim 1, wherein: fixed sleeve (31) radially run through seted up in the hole (311) of permeating water, the hole (311) of permeating water is provided with a plurality ofly and along the axial distribution of fixed sleeve (31).

8. The double-row steel sheet pile cofferdam of claim 1, wherein: the guide rail column (2) is provided with a limiting component (5) which limits the sliding of the sliding seat (22) in a damping mode.

9. The double row steel sheet pile cofferdam of claim 8, wherein: the limiting assembly (5) comprises an installation blind hole (51) arranged on the inner wall of the slide way (21) along the arrangement direction of the Larsen steel sheet piles (1), a limiting ball (52) arranged on the installation blind hole (51), a limiting groove (54) arranged on the side face of the sliding seat (22) close to the installation blind hole (51) and a spring (53) arranged in the installation blind hole (51) and forcing the limiting ball (52) to be embedded in the limiting groove (54), wherein the installation blind hole (51) is provided with a plurality of length direction uniform distribution along the guide rail column (2), the limiting groove (54) is provided with a plurality of channels and is vertically uniformly distributed along, every two are adjacent, the space between the installation blind hole (51) is equal to the space between the limiting groove (54), one end of the spring (53) is fixedly connected to the inner wall of the limiting part and the other end of the installation blind hole (51), the limiting groove (54) is a hemispherical groove matched with the limiting ball (52), and the limiting groove (54) extends along the axial direction of the fixing sleeve (31).

10. The double-row steel sheet pile cofferdam of claim 1, wherein: and impermeable cloth is laid on the upstream surface of the Larsen steel plate pile (1).