Large double-wall steel cofferdam capable of intelligently monitoring and finely adjusting sinking deep water and construction method

Abstract

The construction method comprises the following steps that a cofferdam assembling platform is erected between a temporary steel bridge and a steel pile casing, and a steel cofferdam wall body is assembled to form a bottom section cofferdam; the cofferdam assembling platform is demounted in an auxiliary mode through a hydraulic jack; and hoisting the bottom section cofferdam. The cofferdam assembling platform has the beneficial effects that the arc-shaped limiting plates are arranged on the bearing plates to conduct sectional assembling of the cofferdam wall body, after assembling is completed, the jack moves downwards to enable the supporting brackets to be changed into 180 degrees from original 90 degrees, the transverse supports rotate through the rotating shafts and move in the direction close to the steel pipe piles, dismantling of the cofferdam assembling platform is rapidly completed, and the construction efficiency is improved. The efficiency of cofferdam assembly construction is improved; the bulkhead concrete pouring devices are symmetrically arranged on the annular rail to slide and move, the residual slurry collecting tank is arranged to collect and recycle residual slurry overflowing from the pouring tank, the construction cost is saved, and the concrete pouring speed of the division cabin is increased.

Description

Technical Field

[0001] The invention belongs to the field of deepwater large double-wall steel cofferdam construction, and in particular relates to an intelligent monitoring and fine-tuning sinking deepwater large double-wall steel cofferdam and a construction method. Background Art

[0002] Large double-walled steel cofferdams are a common form of deep-water foundation bridge construction. With the increasing requirements for refined construction, structural safety needs to be highly valued. In the past, the hoisting construction methods of large double-walled steel cofferdams had problems such as slow efficiency in dismantling the assembly platform, slow pouring speed of high bulkhead concrete, and low degree of automated monitoring of the steel cofferdam. Therefore, how to monitor the status of the steel cofferdam in real time and to innovate the design and improvement of the cofferdam construction process technology are key factors in the construction of large deep foundation steel cofferdams.

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

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

[0005] This intelligent monitoring and fine-tuning deep-water large double-wall steel cofferdam construction system includes steel pipe piles, steel temporary bridges, steel cofferdam walls and steel casings; 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; An inner support of the cofferdam is arranged inside the steel cofferdam wall; an intelligent monitoring device is installed in the center of the inner support of the cofferdam.

[0006] Preferably, 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 vertical brace and a telescopic diagonal brace are installed under the cross 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-supported right-angle positioning plate is provided on the corbel support; 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.

[0007] Preferably, 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 a circular track installed on the temporary supporting main beam and the temporary supporting tie beam for sliding movement; the bulkhead concrete pouring device comprises two frame systems, which are connected by a telescopic cross bar, each frame structure is provided with a concrete pouring trough No. 2, support rods are vertically arranged in the frame system, and the concrete pouring trough No. 2 is slidably connected to the support rods 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, a slurry outlet main pipe is installed at the bottom of the concrete pouring trough No. 1, the 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.

[0008] Preferably, a base plate is provided at the bottom of the intelligent monitoring device, arc-shaped limit grooves are provided at both ends of the base plate, the base 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 base 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 on both 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 into the top of the vertical plate, and the top of the U-shaped connector is adjusted by a button block, and the adjusting button block is lowered and fixed with an arc-shaped limit block through a positioning rod for clamping the inner support of the cofferdam.

[0009] The construction method of intelligent monitoring and fine-tuning the sinking of a large double-wall steel cofferdam in deep water includes the following steps: 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.

[0010] Preferably, the cross brace and the 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 so that the right-angle positioning plate changes 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.

[0011] Preferably, an inner support of the cofferdam is provided in 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.

[0012] The beneficial effects of the present invention are: 1) The present invention adopts the technology of supporting the cofferdam assembly platform with steel pipe piles, and arranges arc-shaped limit plates on the pressure plate to assemble the cofferdam wall in sections. After the assembly is completed, the jack is moved down to change the supporting bracket from the original 90° to 180°, and the cross brace is rotated by the rotating shaft and moved in the direction close to the steel pipe pile, so that the cofferdam assembly platform is quickly dismantled, thereby improving the efficiency of the cofferdam assembly construction.

[0013] 2) The present invention adopts the technology of pouring concrete bottom sealing in divided cabins in batches. The concrete pouring device of the cabin wall is symmetrically arranged on the circular track for sliding movement. The sliding rod is arranged and placed in the sliding rail of the support rod, which is convenient for the pouring trough to move up and down to adjust the relative position. A residual slurry collecting trough is provided to collect and recycle the residual slurry overflowing from the pouring trough, which saves construction costs and improves the concrete pouring speed of the divided cabin.

[0014] 3) The present invention adopts the intelligent monitoring technology of steel cofferdam with detachable integral bracket. The left and right adjacent intelligent monitoring devices are quickly connected through the connecting plate in the arc-shaped limit groove. The upper and lower adjacent devices are fixed by telescopic connecting rods. The relative positions of the upper and lower devices are adjusted, and the arc-shaped limit blocks are used to clamp the support inside the cofferdam to realize real-time monitoring of the entire sinking process of the cofferdam. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the cofferdam assembly platform supported by pipe piles; Figure 2 It is a structural diagram of the cofferdam assembly platform; Figure 3 This is a schematic diagram of the structure before the steel pipe pile support is removed; Figure 4 It is a schematic diagram of the structure after the steel pipe pile support is removed; Figure 5 It is the plan layout of the cofferdam assembly platform supported by pipe piles; Figure 6 It is a schematic diagram of the structure of the bulkhead concrete pouring device; Figure 7 It is a schematic diagram of the connection of adjacent concrete pouring troughs; Figure 8 It is a plan view of pouring concrete in divided cabins in stages; Fig. 9 It is a schematic elevation diagram of the intelligent monitoring of the steel cofferdam with a detachable integral support; Fig.10 It is the plan layout of intelligent monitoring points of steel cofferdam; Fig.11 It is a structural schematic diagram of a detachable integral intelligent monitoring device; Fig.12 It is a structural diagram of the intelligent monitoring device before it is assembled; Fig.13 It is a schematic diagram of the structure of the intelligent monitoring device after assembly.

[0016] Explanation of the reference numerals: 1-steel pipe pile, 2-positioning hole, 3-steel temporary bridge, 4-steel cofferdam wall, 5-arc limit plate, 6-steel casing, 7-pressure plate, 8-right angle positioning plate, 9-hoop, 10-rotating shaft, 11-limit block, 12-corbel support, 13-jack, 14-telescopic diagonal brace, 15-vertical brace, 16-horizontal brace, 17-cap, 18-residual slurry collection trough, 19-support rod, 20-slurry outlet main pipe, 21-concrete casting trough 1, 22-slurry outlet branch pipe, 23-telescopic cross bar, 24-concrete casting trough 2, 25-upper frame structure, 26-slide rail, 27-slide rod, 28-limiting ring, 29-connecting Tie rod, 30-slurry outlet pipe, 31-lower frame structure, 32-annular 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 inner support, 40-intelligent monitoring layout point, 41-arc limit groove, 42-U-shaped connector, 43-bottom plate, 44-positioning rod, 45-adjustment button, 46-arc limit block, 47-reserved groove, 48-vertical plate, 49-square connecting plate, 50-tightening threaded rod, 51-rotating threaded rod, 52-stress sensor, 53-insert block, 54-jack. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0018] Embodiment 1 As an example, Figures 1 to 13 As 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 walls 4 and steel casings 6; A steel pipe pile 1 is provided at the bottom of the steel temporary bridge 3, a cross brace 16 is provided between the steel pipe pile 1 and the steel casing 6, a pressure plate 7 is provided on the cross brace 16 to form a cofferdam assembly platform, and a steel cofferdam wall 4 is installed on the pressure plate 7; like Figures 1 to 4 As shown, specifically, a right-angle positioning plate 8 is provided on the side wall of the steel casing 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 clamp 9 is installed on the steel casing 6 below the right-angle positioning plate 8, a corbel support 12 is welded on the clamp 9, and a jack 13 is provided on the corbel support 12 to support the right-angle positioning plate 8; an arc-shaped limit plate 5 is provided on the pressure plate 7, and the steel cofferdam wall body 4 is placed between the two arc-shaped limit plates 5.

[0019] like Figure 8 As shown, a circular track 32 is provided inside the steel cofferdam wall 4, and a bulkhead concrete pouring device 34 is provided on the circular track 32; like Figure 6 to Figure 7 As shown, the bulkhead concrete pouring device 34 includes a concrete pouring trough 1 21 and two concrete pouring troughs 24 , and the concrete pouring trough 1 21 is used to supply slurry to the concrete pouring troughs 24 .

[0020] Specifically, a temporary supporting main beam 33 and a temporary supporting tie beam 35 are symmetrically welded on the inner side of the steel cofferdam wall body 4; two bulkhead concrete pouring devices 34 are symmetrically arranged on a circular track 32 installed on the temporary supporting main beam 33 and the temporary supporting tie beam 35 for sliding movement; 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 concrete pouring trough 24, and a support rod 19 is vertically provided in the frame system. The support rod 19 is slidably connected by a slide rod 27; a limit ring 28 is provided at the center of the bottom of the frame structure, and a slurry outlet pipe 30 at the bottom of the concrete casting trough 24 is placed in the limit ring 28; a concrete casting trough 1 21 is provided behind the concrete casting trough 24 on one side, and a slurry outlet main pipe 20 is installed at the bottom of the concrete casting trough 1 21, and the slurry outlet main pipe 20 is connected to a slurry outlet branch pipe 22, and the two slurry outlet branch pipes 22 are respectively connected to the two concrete casting troughs 24; a residual slurry collecting tank 18 is provided at the bottom of the concrete casting trough 1 21 like Figures 9 to 13 As shown, a cofferdam inner support 39 is provided inside the steel cofferdam wall 4; an intelligent monitoring device 36 is installed in the center of the cofferdam inner support 39.

[0021] Specifically, a bottom plate 43 is provided at the bottom of the intelligent monitoring device 36, and arc-shaped limit grooves 41 are provided at both ends of the bottom plate 43. The bottom plates 43 of the left and right adjacent intelligent monitoring devices 36 are connected by a connecting plate 38, and the upper and lower adjacent connecting plates 38 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, and stress sensors 52 are respectively provided on both sides of the vertical plate 48. Square connecting plates 49 are connected to both sides of the stress sensor 52 through a tightening threaded rod 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 to the inner support 39 of the cofferdam through a U-shaped connector 42, and the U-shaped connector 42 is inserted at the top of the vertical plate 48. The top of the U-shaped connector 42 is adjusted by a button 45, and the adjusting button 45 is lowered and fixed with an arc-shaped limit block 46 through a positioning rod 44, which is used to clamp the inner support 39 of the cofferdam Embodiment 2 As another embodiment, this embodiment 2 proposes, based on the embodiment 1, a more specific intelligent monitoring and fine-tuning construction system for sinking a large double-walled steel cofferdam in deep water: A square steel 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 limit 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 under the cross brace 16 to enhance the stability of the structure; the bracket support 12 is welded to the hoop 9 under the right-angle positioning plate 8, and a jack 13 is arranged on it to tighten the right-angle positioning plate 8; a pressure plate 7 is installed on the evenly arranged cross braces 16 , the steel cofferdam wall 4 is placed in two arc-shaped limit plates 5 arranged on the plate for segmented assembly; after the steel cofferdam wall 4 is assembled, the steel cofferdam is lifted by the hydraulic jack lowering system, the pressure plate 7 is removed, and the jack 13 is moved down, 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 is rotated through the rotating shaft 10, and the telescopic diagonal brace 14 placed inside the cross brace is moved toward the direction close to the steel pipe pile 1, and finally the bottom section cofferdam is lowered.

[0022] A temporary support main beam 33 is symmetrically welded on the inner side of the steel cofferdam wall body 4, and a temporary support tie beam 35 is set to strengthen the connection and fixation with the cofferdam; two bulkhead concrete pouring devices 34 are symmetrically arranged on the circular track 32 installed on the temporary support main beam 33 and the temporary support tie beam 35 for sliding movement; the bulkhead concrete pouring device 34 is composed of two concrete troughs 24, which are respectively placed in a frame system composed of an upper frame structure 25, a lower frame structure 31 and a support rod 19, and two sets of sliding rods 27 are symmetrically arranged on the concrete pouring trough 24 and placed in the slide rail 26 of the support rod 19, so as to facilitate the pouring trough to move up and down to adjust the relative position A limiting ring 28 connected to the connecting rod 29 is arranged at the center of the lower frame structure 31, and the slurry outlet pipe 30 at the bottom of the casting trough is placed in the limiting ring 28 for precise positioning; two adjacent concrete casting troughs 24 are connected by a telescopic cross bar 23; a concrete casting trough 1 21 is arranged behind one of the concrete casting troughs 24, and a slurry outlet main pipe 20 is installed at the bottom thereof, which is respectively connected to the slurry outlet branch pipes 22, and the concrete is transferred to the two concrete casting troughs 24 through the branch pipes; three residual slurry collecting troughs 18 welded to the support rods 19 are arranged at the bottom of the concrete casting trough 1 21 to collect and recycle the residual slurry overflowing from the casting trough.

[0023] The intelligent monitoring deployment point 40 is arranged at the center of the inner support 39 of the steel cofferdam wall 4; the intelligent monitoring device 36 is installed on the intelligent monitoring deployment point 40, and the left and right adjacent devices are connected by a connecting plate 38 in the arc-shaped limit groove 41 and fastened with bolts, and the upper and lower adjacent devices 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, and a tightening threaded rod 50 is arranged to be fixed with a square connecting plate 49 passing through the reserved groove 47; the intelligent monitoring device 36 is fixed to the inner support 39 of the cofferdam through a U-shaped connector 42, and two plug blocks 53 are arranged at the bottom of the connector to be inserted into the socket 54 at the top of the vertical plate 48, and an adjustment button 45 is arranged on the top to be fixed with the arc-shaped limit block 46 through the positioning rod 44, and the arc-shaped limit block 46 is used to clamp the inner support 39 of the cofferdam, thereby realizing real-time monitoring of the entire process of cofferdam sinking.

[0024] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0025] Embodiment 3 As another embodiment, this embodiment 3 proposes, based on the embodiments 1 and 2, a construction method for intelligently monitoring and fine-tuning the sinking of a deep-water large double-wall steel cofferdam using this construction system, comprising the following steps: Step 1, erection of cofferdam assembly platform and assembly of bottom section cofferdam: square steel temporary bridge 3 is arranged on steel pipe pile 1, one end of cross brace 16 is placed in positioning hole 2 of inner steel pipe pile 1, and the other end is placed in limiting block 11 of right-angle positioning plate 8 of steel casing 6, and fixed by bolts; vertical brace 15 and telescopic diagonal brace 14 are installed under cross brace 16 to enhance the stability of the structure; corbel support 12 is welded to the hoop 9 under right-angle positioning plate 8, and jack 13 is arranged thereon to tighten right-angle positioning plate 8; pressure plate 7 is installed on evenly arranged cross brace 16, and steel cofferdam wall 4 is placed in two arc-shaped limiting plates 5 arranged on the plate for segmented assembly.

[0026] Step 2: lifting the bottom cofferdam: after the steel cofferdam wall 4 is assembled, the steel cofferdam is lifted by a hydraulic jack lowering system.

[0027] Dismantling of the assembly platform: first remove the pressure plate 7 and move the jack 13 downward so that the right-angle positioning plate 8 changes 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 moves the telescopic diagonal brace 14 placed inside the cross brace toward the steel pipe pile 1 to complete the dismantling of the assembly platform.

[0028] Step 3: hoist and lower the bottom cofferdam, use two bulkhead concrete pouring devices 34 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.

[0029] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiments 1 and 2 can be referenced to each other and will not be described in detail in this application.

[0030] Embodiment 4 As another embodiment, this embodiment 4 proposes, on the basis of the embodiment 3, a more specific construction method for intelligent monitoring and fine-tuning the sinking of a deep-water large double-wall steel cofferdam, wherein steps 3 to 4 are specifically as follows: Step 3, cofferdam landing and high bulkhead concrete pouring: lower the bottom cofferdam to a suspended state through the steel strand hanging system, 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 landed; temporary support main beams 33 are symmetrically welded on the inner side of the steel cofferdam wall 4, and temporary support tie beams 35 are set to strengthen the connection and fixation with the cofferdam; two bulkhead concrete pouring devices 34 are symmetrically arranged on the circular track 32 installed on the temporary support main beam 33 and the temporary support tie beam 35 for sliding movement; the bulkhead concrete pouring device 34 consists of two concrete troughs 24, which are respectively placed in a frame system consisting of an upper frame structure 25, a lower frame structure 31 and a support rod 19, and in the concrete pouring trough Two groups of sliding rods 27 are symmetrically arranged on the second 24 and placed in the sliding rails 26 of the support rods 19, so as to facilitate the up and down movement of the casting trough to adjust the relative position; 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 casting trough is placed in the limiting ring 28 for precise positioning; two adjacent concrete casting troughs 24 are connected by setting a telescopic cross bar 23; a concrete casting trough 1 21 is arranged behind one of the concrete casting troughs 24, and a 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 transmitted to the two concrete casting troughs 24 through the branch pipes; three residual slurry collecting troughs 18 welded on the support rods 19 are arranged at the bottom of the concrete casting trough 1 21 to collect and recycle the residual slurry overflowing from the casting trough.

[0031] 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.

[0032] Step 4, intelligent monitoring of cofferdam: adopt the intelligent monitoring technology of steel cofferdam with detachable integral bracket to realize real-time monitoring of the whole process of cofferdam sinking; the intelligent monitoring deployment point 40 is set at the center of the inner support 39 of the cofferdam of the steel cofferdam wall 4; the intelligent monitoring device 36 is installed on the intelligent monitoring deployment point 40, and the left and right adjacent devices are connected by the connecting plate 38 in the arc-shaped limit groove 41 and fastened with bolts, and the upper and lower adjacent devices are fixed by installing a telescopic connecting rod 37 on the connecting plate 38 to adjust the relative position of the upper and lower devices; intelligent A vertical plate 48 is installed on the bottom plate 43 of the monitoring device 36, and two stress sensors 52 are respectively placed on both sides of the vertical plate 48. A tightening threaded rod 50 is set to fix it with a square connecting plate 49 passing through the reserved groove 47; the intelligent monitoring device 36 is fixed to the inner support 39 of the cofferdam through a U-shaped connecting piece 42, and two plug blocks 53 are set at the bottom of the connecting piece to be inserted into the socket 54 at the top of the vertical plate 48. An adjustment button 45 is set at the top and fixed with an arc-shaped limit block 46 through a positioning rod 44, and the arc-shaped limit block 46 is used to clamp the inner support 39 of the cofferdam.

[0033] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiments 1 to 3 can be referenced to each other and will not be described in detail in this application.

[0034] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced 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; An inner support of the cofferdam is arranged inside the steel cofferdam wall; an intelligent monitoring device is installed in the center of the inner support of the cofferdam.

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 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.

3. The intelligent monitoring and fine-tuning deep-water large double-wall steel cofferdam construction system according to claim 1 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.

4. The intelligent monitoring and fine-tuning deep-water large double-wall steel cofferdam construction system according to claim 1 is characterized in that: A base plate is provided at the bottom of the intelligent monitoring device, and arc-shaped limit grooves are provided at both ends of the base plate. The base 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 base plate of the intelligent monitoring device, and stress sensors are respectively provided on both sides of the vertical plate. 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 into the top of the vertical plate. The top of the U-shaped connector is adjusted by a button block, and the adjusting button block is lowered and fixed with an arc-shaped limit block through a positioning rod to clamp the inner support of the cofferdam.

5. 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 4, 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: Use hydraulic jacks to assist in dismantling the cofferdam assembly platform; 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.

6. The construction method of intelligent monitoring and fine-tuning deep-water large double-wall steel cofferdam according to claim 5 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.

7. The construction method of intelligent monitoring and fine-tuning deep-water large double-wall steel cofferdam according to claim 5 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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