Intelligent Monitoring and Fine-Tuning Deep-Water Large Double-Walled Steel Cofferdam Sinking and Construction Method

Abstract

The present invention relates to an intelligent monitoring and fine-tuning sunken deep-water large double-wall steel cofferdam and a construction method, which includes the following steps: erect a cofferdam assembly platform between a steel temporary bridge and a steel casing, and assemble the steel cofferdam wall body to form the bottom-section cofferdam; assist in demolishing the cofferdam assembly platform through a hydraulic jack; hoist and place the bottom-section cofferdam. The beneficial effects of the present invention are as follows: an arc-shaped limiting plate is arranged on the bearing plate for segmented assembly of the cofferdam wall body. After the assembly is completed, the support corbel is changed from the original 90° to 180° by the downward movement of the jack, and the cross brace rotates through a rotating shaft and moves towards the direction close to the steel pipe pile, quickly completing the demolition of the cofferdam assembly platform and improving the efficiency of cofferdam assembly construction; the bulkhead concrete pouring device is symmetrically arranged to slide and move on the annular track, and a surplus slurry collecting trough is arranged to collect and recycle the surplus slurry overflowing outside the pouring trough, saving the construction cost and increasing the pouring speed of the segmented cabin concrete.

Description

Technical Field

[0001] The invention belongs to the field of deep - water large - scale double - wall steel cofferdam construction, and particularly relates to an intelligent monitoring and fine - tuning sinking deep - water large - scale double - wall steel cofferdam and a construction method thereof. Background Technique

[0002] The large - scale double - wall steel cofferdam is a commonly used form in the construction of deep - water foundation bridges. With the improvement of construction refinement requirements, structural safety needs to be highly emphasized. In the previous large - scale double - wall steel cofferdam hoisting construction methods, there are problems such as slow disassembly efficiency of the assembly platform, low pouring speed of high - bulkhead concrete, and low degree of automation monitoring of the steel cofferdam. Therefore, how to monitor the state of the steel cofferdam in real time and innovate and improve the construction technology of the cofferdam is a key factor in the construction of large - scale deep - foundation steel cofferdams.

[0003] In summary, it is very meaningful to seek a construction method for an intelligent monitoring and fine - tuning sinking deep - water large - scale double - wall steel cofferdam with high construction efficiency, low construction cost, and simple operation. Summary of the Invention

[0004] The purpose of the invention is to overcome the deficiencies in the prior art and provide an intelligent monitoring and fine - tuning sinking deep - water large - scale double - wall steel cofferdam and a construction method thereof.

[0005] This intelligent monitoring and fine - tuning sinking deep - water large - scale double - wall steel cofferdam construction system includes steel pipe piles, steel temporary bridges, steel cofferdam wall bodies, and steel casing pipes;

[0006] The bottom of the steel temporary bridge is provided with steel pipe piles. There are cross braces between the steel pipe piles and the steel casing pipes. A bearing plate is arranged on the cross braces to form a cofferdam assembly platform, and the steel cofferdam wall body is installed on the bearing plate; an annular track is arranged inside the steel cofferdam wall body, and a bulkhead concrete pouring device is arranged on the annular track;

[0007] The bulkhead concrete pouring device includes a first concrete pouring trough and two second concrete pouring troughs. The first concrete pouring trough is used to supply slurry to the second concrete pouring troughs;

[0008] There is an internal support inside the steel cofferdam wall body; an intelligent monitoring device is installed in the center of the internal support of the cofferdam.

[0009] Preferably, a right - angle positioning plate is arranged on the side wall of the steel casing pipe. One end of the cross brace is placed in the positioning hole of the inner steel pipe pile, and the other end is placed on the right - angle positioning plate and fixed by bolts; vertical braces and telescopic diagonal braces are installed below the cross brace; a hoop is installed on the steel casing pipe below the right - angle positioning plate, a bracket support is welded on the hoop, and a jack is arranged on the bracket support to support the right - angle positioning plate; arc - shaped limit plates are arranged on the bearing plate, and the steel cofferdam wall body is placed between the two arc - shaped limit plates.

[0010] Preferably, temporary support main beams and temporary support cross beams are symmetrically welded to the inner side of the steel cofferdam wall; two bulkhead concrete pouring devices are symmetrically arranged and slide on the circular tracks installed on the temporary support main beams and temporary support cross beams; the bulkhead concrete pouring device includes two frame systems, which are connected by a telescopic cross bar, and each frame structure is provided with a second concrete pouring trough. A support rod is vertically arranged in the frame system, and the second concrete pouring trough is slidably connected to the support rod through a sliding rod; a limit ring is arranged at the center of the bottom of the frame structure, and the bottom slurry outlet pipe of the second concrete pouring trough is placed in the limit ring; a first concrete pouring trough is arranged behind the second concrete pouring trough on one side, and a main slurry outlet pipe is installed at the bottom of the first concrete pouring trough. The main slurry outlet pipe is connected with slurry outlet branch pipes, and the two slurry outlet branch pipes are respectively connected into the two second concrete pouring troughs; a surplus slurry collection trough is arranged at the bottom of the first concrete pouring trough.

[0011] Preferably, the bottom of the intelligent monitoring device is provided with a bottom plate, and arc-shaped limit grooves are arranged at both ends of the bottom plate. The bottom plates of adjacent intelligent monitoring devices on the left and right are connected by a connecting plate, and the upper and lower adjacent connecting plates are fixed by a telescopic connecting rod; a vertical plate is installed on the bottom plate of the intelligent monitoring device, and stress sensors are respectively arranged on both sides of the vertical plate. Square connecting plates are connected to both sides of the stress sensors through tightening threaded rods, and the square connecting plates pass through the reserved grooves on the vertical plate; the intelligent monitoring device is fixed on the cofferdam internal support through a U-shaped connecting piece. The U-shaped connecting piece is inserted at the top of the vertical plate, and an adjusting button block is arranged at the top of the U-shaped connecting piece. An arc-shaped limit block is fixed through a positioning rod under the adjusting button block for clamping the cofferdam internal support.

[0012] The construction method of the intelligent monitoring and fine-tuning sinking of the deep-water large double-wall steel cofferdam includes the following steps:

[0013] Step 1: Build a cofferdam assembly platform between the steel temporary bridge and the steel casing, and assemble the steel cofferdam wall to form the bottom section of the cofferdam;

[0014] Step 2: Auxiliary demolish the cofferdam assembly platform by a hydraulic jack;

[0015] Step 3: Lift and place the bottom section of the cofferdam, use two bulkhead concrete pouring devices to pour high-bulkhead concrete, and sequentially carry out the assembly and lowering construction of the remaining sections of the cofferdam according to the design until the cofferdam lands on the bed;

[0016] Step 4: The cofferdam sucks mud and sinks: After the cofferdam lands on the bed, start sucking mud and sinking until the design position.

[0017] Preferably, the cross brace and the steel pipe pile are connected by a rotating shaft. A right-angle positioning plate is provided on the side wall of the steel casing. One end of the cross brace is placed in the positioning hole of the inner steel pipe pile, and the other end is placed on the right-angle positioning plate and fixed by bolts. A rotating shaft is provided at the right angle of the right-angle positioning plate. A hoop is installed on the steel casing below the right-angle positioning plate. A bracket support is welded on the hoop, and a jack is arranged on the bracket support to support the right-angle positioning plate. After the steel cofferdam wall body is assembled, the bearing plate is removed, and the jack is retracted to make the right-angle positioning plate change from 90° to 180° through the rotating shaft, canceling the support for the end of the cross brace. The cross brace rotates through the rotating shaft, and at the same time, the telescopic strut retracts towards the steel pipe pile, providing space for the lowering of the bottom section of the cofferdam.

[0018] Preferably, a cofferdam internal support is provided inside the steel cofferdam wall body, and an intelligent monitoring device is installed in the center of the cofferdam internal support to realize real-time monitoring of the whole process of the steel cofferdam sinking.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1) The present invention adopts the steel pipe pile support cofferdam assembly platform technology. An arc-shaped limiting plate is arranged on the bearing plate for segmented assembly of the cofferdam wall body. After the assembly is completed, the support bracket is changed from the original 90° to 180° by the lowering of the jack. The cross brace rotates through the rotating shaft and moves towards the direction close to the steel pipe pile, quickly completing the demolition of the cofferdam assembly platform and improving the efficiency of the cofferdam assembly construction.

[0021] 2) The present invention adopts the technology of segmented pouring of concrete for bottom sealing of the cofferdam. The concrete pouring devices for the cabin walls are symmetrically arranged and slide on the annular track. The sliding rods are arranged in the slide rails of the support rods, facilitating the up and down movement of the pouring trough to adjust the relative position. A surplus slurry collection trough is set to collect and recycle the surplus slurry overflowing from the pouring trough, saving the construction cost and improving the pouring speed of the segmented cabin concrete.

[0022] 3) The present invention adopts the technology of intelligent monitoring of the detachable integral bracket steel cofferdam. The left and right adjacent intelligent monitoring devices are quickly connected through the connecting plates placed in the arc-shaped limiting grooves, and the upper and lower adjacent devices are fixed by telescopic connecting rods. The relative position of the upper and lower devices is adjusted, and the arc-shaped limiting blocks are used to clamp the cofferdam internal support to realize real-time monitoring of the whole process of the cofferdam sinking. Description of the Drawings

[0023] Figure 1 is a structural schematic diagram of the pipe pile support cofferdam assembly platform;

[0024] Figure 2 is a structural schematic diagram of the cofferdam assembly platform;

[0025] Figure 3 is a structural schematic diagram before the removal of the steel pipe pile support;

[0026] Figure 4It is a structural schematic diagram after the removal of the steel pipe pile support;

[0027] Figure 5 It is a plan layout diagram of the pipe pile support cofferdam assembly platform;

[0028] Figure 6 It is a structural schematic diagram of the bulkhead concrete pouring device;

[0029] Figure 7 It is a connection schematic diagram of adjacent concrete pouring troughs;

[0030] Figure 8 It is a plan schematic diagram of pouring concrete in batches in the segmented cabin;

[0031] Figure 9 It is an elevation schematic diagram of the intelligent monitoring of the detachable integral bracket steel cofferdam;

[0032] Figure 10 It is a plan layout diagram of the intelligent monitoring measuring points of the steel cofferdam;

[0033] Figure 11 It is a structural schematic diagram of the detachable integral intelligent monitoring device;

[0034] Figure 12 It is a structural schematic diagram before the intelligent monitoring device is assembled;

[0035] Figure 13 It is a structural schematic diagram after the intelligent monitoring device is assembled.

[0036] Explanation of reference numerals: 1 - steel pipe pile, 2 - positioning hole, 3 - steel temporary bridge, 4 - steel cofferdam wall, 5 - arc-shaped limiting plate, 6 - steel casing, 7 - bearing plate, 8 - right-angle positioning plate, 9 - hoop, 10 - rotating shaft, 11 - limiting block, 12 - bracket support, 13 - jack, 14 - telescopic diagonal brace, 15 - vertical brace, 16 - cross brace, 17 - pile cap, 18 - surplus slurry collection trough, 19 - support rod, 20 - total slurry discharge pipe, 21 - concrete pouring trough 1, 22 - slurry discharge branch pipe, 23 - telescopic cross bar, 24 - concrete pouring trough 2, 25 - upper frame structure, 26 - slide rail, 27 - slide bar, 28 - limiting ring, 29 - connecting rod, 30 - slurry discharge pipe, 31 - lower frame structure, 32 - circular track, 33 - temporary support main beam, 34 - bulkhead concrete pouring device, 35 - temporary support tie beam, 36 - intelligent monitoring device, 37 - telescopic connecting rod, 38 - connecting plate, 39 - cofferdam internal support, 40 - intelligent monitoring layout point, 41 - arc-shaped limiting groove, 42 - U-shaped connecting piece, 43 - bottom plate, 44 - positioning rod, 45 - adjusting block, 46 - arc-shaped limiting block, 47 - reserved groove, 48 - vertical plate, 49 - square connecting plate, 50 - jacking threaded rod, 51 - rotating threaded rod, 52 - stress sensor, 53 - inserting block, 54 - inserting hole. Detailed implementation manners

[0037] The present invention will be further described below in conjunction with embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0038] Embodiment 1

[0039] As an embodiment, as Figures 1 to 13 shown, this intelligent monitoring and fine-tuning deep-water large double-wall steel cofferdam construction system includes steel pipe piles 1, steel temporary bridges 3, steel cofferdam wall bodies 4, and steel casing pipes 6;

[0040] The bottom of the steel temporary bridge 3 is provided with steel pipe piles 1. A cross brace 16 is arranged between the steel pipe piles 1 and the steel casing pipes 6. A bearing plate 7 is arranged on the cross brace 16 to form a cofferdam assembly platform, and the steel cofferdam wall body 4 is installed on the bearing plate 7;

[0041] As Figures 1 to 4 shown, specifically, a right-angle positioning plate 8 is arranged on the side wall of the steel casing pipe 6. One end of the cross brace 16 is placed in the positioning hole 2 of the inner steel pipe pile 1, and the other end is placed on the right-angle positioning plate 8 and fixed by bolts; a vertical brace 15 and a telescopic diagonal brace 14 are installed below the cross brace 16; a hoop 9 is installed on the steel casing pipe 6 below the right-angle positioning plate 8. A bracket support 12 is welded on the hoop 9, and a jack 13 is arranged on the bracket support 12 to support the right-angle positioning plate 8; an arc-shaped limiting plate 5 is arranged on the bearing plate 7, and the steel cofferdam wall body 4 is placed between the two arc-shaped limiting plates 5.

[0042] As Figure 8 shown, an annular track 32 is arranged inside the steel cofferdam wall body 4, and a bulkhead concrete pouring device 34 is arranged on the annular track 32;

[0043] As Figures 6 to 7 shown, the bulkhead concrete pouring device 34 includes a concrete pouring trough 1 21 and two concrete pouring troughs 2 24. The concrete pouring trough 1 21 is used for supplying slurry to the concrete pouring trough 2 24.

[0044] Specifically, temporary support main beams 33 and temporary support cross beams 35 are symmetrically welded to the inner side of the steel cofferdam wall body 4; two bulkhead concrete pouring devices 34 are symmetrically arranged and slide on the annular track 32 installed on the temporary support main beams 33 and temporary support cross beams 35; the bulkhead concrete pouring device 34 includes two frame systems, which are connected by a telescopic cross bar 23. Each frame structure is provided with a second concrete pouring trough 24. A support rod 19 is vertically arranged in the frame system, and the second concrete pouring trough 24 is slidably connected to the support rod 19 through a sliding rod 27; a limit ring 28 is arranged at the center of the bottom of the frame structure, and the bottom slurry outlet pipe 30 of the second concrete pouring trough 24 is placed in the limit ring 28; a first concrete pouring trough 21 is arranged behind the second concrete pouring trough 24 on one side. The bottom of the first concrete pouring trough 21 is provided with a main slurry outlet pipe 20, and the main slurry outlet pipe 20 is connected with slurry outlet branch pipes 22. The two slurry outlet branch pipes 22 are respectively connected to the two second concrete pouring troughs 24; a surplus slurry collecting trough 18 is arranged at the bottom of the first concrete pouring trough 21

[0045] As Figures 9 to 13 shown, a cofferdam internal support 39 is arranged inside the steel cofferdam wall body 4; an intelligent monitoring device 36 is installed in the center of the cofferdam internal support 39

[0046] Specifically, a bottom plate 43 is arranged at the bottom of the intelligent monitoring device 36. Arc-shaped limiting grooves 41 are arranged at both ends of the bottom plate 43. The bottom plates 43 of the adjacent intelligent monitoring devices 36 on the left and right are connected by a connecting plate 38, and the adjacent connecting plates 38 up and down are fixed by a telescopic connecting rod 37; a vertical plate 48 is installed on the bottom plate 43 of the intelligent monitoring device 36. Stress sensors 52 are respectively arranged on both sides of the vertical plate 48. Square connecting plates 49 are connected to both sides of the stress sensors 52 through tightening threaded rods 50, and the square connecting plates 49 pass through the reserved grooves 47 on the vertical plate 48; the intelligent monitoring device 36 is fixed on the cofferdam internal support 39 through a U-shaped connecting piece 42. The U-shaped connecting piece 42 is inserted at the top of the vertical plate 48. An adjusting button 45 is arranged at the top of the U-shaped connecting piece 42. An arc-shaped limiting block 46 is fixed through a positioning rod 44 below the adjusting button 45 for clamping the cofferdam internal support 39

[0047] Embodiment 2

[0048] As another embodiment, this Embodiment 2 is proposed on the basis of Embodiment 1, and a more specific intelligent monitoring and fine-tuning sinking construction system for deep-water large double-wall steel cofferdams

[0049] A square steel temporary bridge 3 is arranged on the steel pipe pile 1. One end of the cross brace 16 is placed in the positioning hole 2 of the inner steel pipe pile 1, and the other end is placed in the limiting block 11 of the right-angle positioning plate 8 of the steel casing 6 and fixed by bolts. A vertical brace 15 and a telescopic diagonal brace 14 are installed below the cross brace 16 to enhance the structural stability. The bracket support 12 is welded to the hoop 9 below the right-angle positioning plate 8, and a jack 13 is arranged thereon to tightly press the right-angle positioning plate 8. The bearing plates 7 are installed on the uniformly arranged cross braces 16, and the steel cofferdam wall body 4 is placed in the two arc-shaped limiting plates 5 arranged on the plates for segmented assembly. After the assembly of the steel cofferdam wall body 4 is completed, the steel cofferdam is lifted by the hydraulic jack lowering system, the bearing plates 7 are removed, and the jack 13 is lowered, so that the right-angle positioning plate 8 is changed from the original 90° to 180° through the rotating shaft 10. At the same time, the cross brace 16 rotates through the rotating shaft 10, and the telescopic diagonal brace 14 arranged inside the cross brace moves towards the direction close to the steel pipe pile 1, and finally the bottom section of the cofferdam is lowered.

[0050] The temporary support main beams 33 are symmetrically welded on the inner side of the steel cofferdam wall body 4, and the temporary support tie beams 35 are arranged to strengthen the connection and fixation with the cofferdam. Two bulkhead concrete pouring devices 34 are symmetrically arranged to slide on the annular tracks 32 installed on the temporary support main beams 33 and the temporary support tie beams 35. The bulkhead concrete pouring device 34 is composed of two concrete pouring troughs II 24, which are respectively placed in the frame system composed of the upper frame structure 25, the lower frame structure 31 and the support rods 19. Two groups of sliding rods 27 are symmetrically arranged on the concrete pouring troughs II 24 and placed in the slide rails 26 of the support rods 19 to facilitate the up and down movement of the pouring troughs to adjust the relative positions. A limiting ring 28 connected to the connecting rod 29 is arranged at the center of the lower frame structure 31, and the bottom slurry outlet pipe 30 of the pouring trough is placed in the limiting ring 28 for precise positioning. The adjacent two concrete pouring troughs II 24 are connected by setting a telescopic cross bar 23. A concrete pouring trough I 21 is arranged behind one of the concrete pouring troughs II 24. The bottom of it is provided with a slurry outlet main pipe 20, which is respectively connected to the slurry outlet branch pipes 22, and the concrete is conveyed to the two concrete pouring troughs II 24 through the branch pipes. Three surplus slurry collecting troughs 18 welded to the support rods 19 are arranged at the bottom of the concrete pouring trough I 21 to collect and recycle the surplus slurry overflowing from the pouring trough.

[0051] The described intelligent monitoring layout point 40 is set at the center of the cofferdam internal support 39 of the steel cofferdam wall body 4; an intelligent monitoring device 36 is installed on the intelligent monitoring layout point 40. The adjacent devices on the left and right are connected by a connecting plate 38 placed in the arc-shaped limiting groove 41 and fastened with bolts. The adjacent devices above and below are fixed by installing telescopic connecting rods 37 on the connecting plate 38 to adjust the relative positions of the upper and lower devices. A vertical plate 48 is installed on the bottom plate 43 of the intelligent monitoring device 36. Two stress sensors 52 are respectively placed on both sides of the vertical plate 48. A tightening threaded rod 50 is set and fixed to a square connecting plate 49 passing through a reserved groove 47. The intelligent monitoring device 36 is fixed on the cofferdam internal support 39 through a U-shaped connecting piece 42. Two insertion blocks 53 are arranged at the bottom of the connecting piece and inserted into the jacking holes 54 at the top of the vertical plate 48. An adjusting button block 45 is arranged at the top and fixed to an arc-shaped limiting block 46 through a positioning rod 44. The cofferdam internal support 39 is clamped by the arc-shaped limiting block 46, so as to realize the real-time monitoring of the whole process of the cofferdam sinking.

[0052] It should be noted that the parts that are the same or similar to those in Embodiment 1 in this embodiment can be referred to each other and will not be described in detail in this application.

[0053] Embodiment 3

[0054] As another embodiment, this Embodiment 3 is proposed on the basis of Embodiments 1 and 2. The construction method of the intelligent monitoring fine-tuning and sinking of a deep-water large double-wall steel cofferdam using this construction system includes the following steps:

[0055] Step 1: Erection of the cofferdam assembly platform and assembly of the bottom section of the cofferdam: A square steel temporary bridge 3 is arranged on the steel pipe piles 1. One end of a cross brace 16 is placed in the positioning hole 2 of the inner steel pipe pile 1, and the other end is placed in the limiting block 11 of the right-angle positioning plate 8 of the steel casing 6 and fixed with bolts; a vertical brace 15 and a telescopic diagonal brace 14 are installed below the cross brace 16 to enhance the structural stability; a bracket support 12 is welded to the hoop 9 below the right-angle positioning plate 8, and a jack 13 is arranged on it to press against the right-angle positioning plate 8; bearing plates 7 are installed on the uniformly arranged cross braces 16, and the steel cofferdam wall body 4 is placed in two arc-shaped limiting plates 5 arranged on the plate for sectional assembly.

[0056] Step 2: Lifting of the bottom section of the cofferdam: After the assembly of the steel cofferdam wall body 4 is completed, the steel cofferdam is lifted by a hydraulic jack lowering system.

[0057] Demolition of the assembly platform: First, the bearing plates 7 are removed, and the jack 13 is lowered, so that the right-angle positioning plate 8 is changed from the original 90° to 180° through a rotating shaft 10; at the same time, the cross brace 16 rotates through the rotating shaft 10, and the telescopic diagonal brace 14 placed inside the cross brace moves towards the direction close to the steel pipe pile 1 to complete the demolition of the assembly platform.

[0058] Step 3: Hoist and place the bottom section of the cofferdam, use two bulkhead concrete pouring devices 34 to pour high bulkhead concrete, and successively carry out the assembly and lowering construction of the remaining sections of the cofferdam according to the design until the cofferdam lands on the bed.

[0059] Step 4: Sink the cofferdam by dredging: After the cofferdam lands on the bed, start to sink the cofferdam by dredging until it reaches the designed position.

[0060] It should be noted that the parts that are the same or similar to those in Embodiment 1 and Embodiment 2 in this embodiment can be referred to each other and will not be elaborated in this application.

[0061] Embodiment 4

[0062] As another embodiment, this Embodiment 4 is proposed on the basis of Embodiment 3. A more specific construction method for intelligent monitoring and fine-tuning the sinking of a deep-water large double-wall steel cofferdam. Steps 3 to 4 are specifically as follows:

[0063] Step 3: Cofferdam landing on the bed and high bulkhead concrete pouring: Lower the bottom section of the cofferdam to a suspended state through the steel strand hanging system, use two bulkhead concrete pouring devices to pour high bulkhead concrete, and successively carry out the assembly and lowering construction of the remaining sections of the cofferdam according to the design until the cofferdam lands on the bed; symmetrically weld temporary support main beams 33 inside the steel cofferdam wall 4, and set temporary support tie beams 35 to strengthen the connection and fixation with the cofferdam; two bulkhead concrete pouring devices 34 are symmetrically arranged on the annular track 32 installed on the temporary support main beam 33 and the temporary support tie beam 35 to slide and move; the bulkhead concrete pouring device 34 is composed of two concrete troughs II 24, which are respectively placed in the frame system composed of the upper frame structure 25, the lower frame structure 31 and the support rod 19, and two groups of sliding rods 27 are symmetrically arranged on the concrete pouring trough II 24 and placed in the slide rails 26 of the support rod 19 to facilitate the up and down movement of the pouring trough to adjust the relative position; a limit ring 28 connected to the connecting rod 29 is set at the center of the lower frame structure 31, and the bottom slurry outlet pipe 30 of the pouring trough is placed in the limit ring 28 for precise positioning; the adjacent two concrete pouring troughs II 24 are connected by setting telescopic cross bars 23; a concrete pouring trough I 21 is arranged behind one of the concrete pouring troughs II 24, and the bottom slurry outlet main pipe 20 is installed at its bottom, which is respectively connected to the slurry outlet branch pipes 22, and the concrete is conveyed to the two concrete pouring troughs II 24 through the branch pipes; three surplus slurry collection troughs 18 welded on the support rod 19 are arranged at the bottom of the concrete pouring trough I 21 to collect and recycle the surplus slurry overflowing from the pouring trough.

[0064] Sink the cofferdam by dredging: After the cofferdam lands on the bed, start to sink the cofferdam by dredging until it reaches the designed position.

[0065] Step 4. Intelligent monitoring of cofferdam: The intelligent monitoring technology of the detachable integral bracket steel cofferdam is adopted to realize the real-time monitoring of the whole process of cofferdam sinking; the intelligent monitoring layout point 40 is set at the center of the cofferdam internal support 39 of the steel cofferdam wall 4; an intelligent monitoring device 36 is installed on the intelligent monitoring layout point 40, and the adjacent devices on the left and right are connected by a connecting plate 38 placed in the arc-shaped limiting groove 41 and fastened with bolts. The adjacent devices up and down are fixed by installing a telescopic connecting rod 37 on the connecting plate 38 to adjust the relative positions of the upper and lower devices; a vertical plate 48 is installed on the bottom plate 43 of the intelligent monitoring device 36, and two stress sensors 52 are respectively placed on both sides of the vertical plate 48. A top-tight threaded rod 50 is set and fixed to a square connecting plate 49 passing through a reserved groove 47; the intelligent monitoring device 36 is fixed on the cofferdam internal support 39 through a U-shaped connecting piece 42. Two insertion blocks 53 are arranged at the bottom of the connecting piece and inserted into the jacks 54 at the top of the vertical plate 48, and an adjusting button block 45 is arranged at the top and fixed to an arc-shaped limiting block 46 through a positioning rod 44. The cofferdam internal support 39 is clamped by using the arc-shaped limiting block 46.

[0066] It should be noted that the same or similar parts in this embodiment and Embodiments 1 to 3 can be referred to each other and will not be elaborated in this application.

[0067] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

Claims

1. An intelligent monitoring and fine-tuning deep-water large double-wall steel cofferdam construction system, characterized in that: Including steel pipe piles, steel temporary bridges, steel cofferdam walls and steel casing; Steel pipe piles are arranged at the bottom of the steel temporary bridge, and a cross brace is arranged between the steel pipe piles and the steel casing. A pressure plate is arranged on the cross brace to form a cofferdam assembly platform, and the steel cofferdam wall is installed on the pressure plate; a circular track is arranged inside the steel cofferdam wall, and a bulkhead concrete pouring device is arranged on the circular track; The bulkhead concrete pouring device comprises a first concrete pouring trough and two second concrete pouring troughs, wherein the first concrete pouring trough is used for supplying slurry to the second concrete pouring troughs; The steel cofferdam wall is provided with an inner support of the cofferdam; an intelligent monitoring device is installed in the center of the inner support of the cofferdam; A bottom plate is provided at the bottom of the intelligent monitoring device, arc-shaped limit grooves are provided at both ends of the bottom plate, the bottom plates of the left and right adjacent intelligent monitoring devices are connected by connecting plates, and the upper and lower adjacent connecting plates are fixed by telescopic connecting rods; a vertical plate is installed on the bottom plate of the intelligent monitoring device, and stress sensors are respectively provided on both sides of the vertical plate, and square connecting plates are connected to the two sides of the stress sensor through tightening threaded rods, and the square connecting plates pass through the reserved grooves on the vertical plates; the intelligent monitoring device is fixed to the inner support of the cofferdam through a U-shaped connector, and the U-shaped connector is inserted on the top of the vertical plate, and the top of the U-shaped connector is adjusted by a button, and the adjustment button is lowered and fixed with an arc-shaped limit block through a positioning rod, which is used to clamp the inner support of the cofferdam; A right-angle positioning plate is provided on the side wall of the steel casing, one end of the horizontal brace is placed in the positioning hole of the inner steel pipe pile, and the other end is placed on the right-angle positioning plate and fixed by bolts; vertical braces and telescopic diagonal braces are installed under the horizontal brace; a clamp is installed on the steel casing under the right-angle positioning plate, a corbel support is welded on the clamp, and a jack is provided on the corbel support to support the right-angle positioning plate; an arc-shaped limit plate is provided on the pressure plate, and the steel cofferdam wall is placed between the two arc-shaped limit plates.

2. According to claim 1, the intelligent monitoring and fine-tuning deep-water large double-wall steel cofferdam construction system is characterized in that: A temporary supporting main beam and a temporary supporting tie beam are symmetrically welded on the inner side of the steel cofferdam wall; two bulkhead concrete pouring devices are symmetrically arranged on the circular track installed on the temporary supporting main beam and the temporary supporting tie beam for sliding movement; the bulkhead concrete pouring device includes two frame systems, which are connected by a telescopic cross bar, and each frame structure is provided with a concrete pouring trough No. 2, and a support rod is vertically arranged in the frame system, and the concrete pouring trough No. 2 is slidably connected to the support rod through a sliding rod; a limiting ring is provided at the center of the bottom of the frame structure, and a slurry outlet pipe at the bottom of the concrete pouring trough No. 2 is placed in the limiting ring; a concrete pouring trough No. 1 is provided at the rear of the concrete pouring trough No. 2 on one side, and a slurry outlet main pipe is installed at the bottom of the concrete pouring trough No. 1, and a slurry outlet main pipe is connected to a slurry outlet branch pipe, and the two slurry outlet branch pipes are respectively connected to the two concrete pouring troughs No. 2; a residual slurry collecting trough is provided at the bottom of the concrete pouring trough No.

1.

3. The construction method for intelligently monitoring and fine-tuning the sinking of a deep-water large double-walled steel cofferdam as claimed in any one of claims 1 to 2, characterized in that: The following steps are involved: Step 1: Set up a cofferdam assembly platform between the steel temporary bridge and the steel casing, and assemble the steel cofferdam wall to form a bottom section cofferdam; Step 2: Remove the cofferdam assembly platform with the assistance of hydraulic jacks; Step 3: hoist and lower the bottom cofferdam, use two bulkhead concrete pouring devices to pour high bulkhead concrete, and assemble and lower the remaining cofferdam segments in sequence according to the design until the cofferdam is placed on the bed; Step 4. The cofferdam absorbs mud and sinks: After the cofferdam is placed on the bed, it starts to absorb mud and sink until it reaches the designed position.

4. The construction method of intelligent monitoring and fine-tuning deep-water large double-wall steel cofferdam according to claim 3 is characterized in that: The cross brace and steel pipe piles are connected by a rotating shaft, and a right-angle positioning plate is provided on the side wall of the steel casing. One end of the cross brace is placed in the positioning hole of the inner steel pipe pile, and the other end is placed on the right-angle positioning plate and fixed by bolts; a rotating shaft is provided at the right angle of the right-angle positioning plate, and a clamp is installed on the steel casing below the right-angle positioning plate, and a corbel support is welded on the clamp, and a jack is provided on the corbel support to support the right-angle positioning plate; after the steel cofferdam wall is assembled, the pressure plate is removed, and the jack is retracted to change the right-angle positioning plate from 90° to 180° through the rotating shaft, thereby canceling the support for the end of the cross brace; the cross brace rotates through the rotating shaft, and at the same time, the telescopic diagonal brace is retracted toward the steel pipe pile to provide space for the lowering of the bottom section of the cofferdam.

5. The construction method of intelligent monitoring and fine-tuning deep-water large double-wall steel cofferdam according to claim 4 is characterized in that: An inner support of the cofferdam is arranged inside the wall of the steel cofferdam, and an intelligent monitoring device is installed in the center of the inner support of the cofferdam to realize real-time monitoring of the whole sinking process of the steel cofferdam.

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