Steel cofferdam structure for first piling and second weir and construction and installation method of steel cofferdam structure

Abstract

The invention relates to the technical field of steel cofferdams, and discloses a steel cofferdam structure used for first piling and then weir and a construction and installation method of the steel cofferdam structure, the structure comprises wall plates, and a plurality of wall plates are connected in sequence to form an annular cofferdam structure; wherein the wall plate comprises an inner plate, an outer plate and a horizontal bracket, the inner plate and the outer plate are arranged in parallel, and the horizontal bracket is fixed between the inner plate and the outer plate; the bulkhead plates are arranged between the inner plate and the outer plate, so that the annular cofferdam structure is divided into a plurality of cabins; the multiple inner supports are sequentially fixed to the inner plate from top to bottom; wherein the inner support comprises a cross-shaped support and an inclined support, the cross-shaped support is arranged in the middle of the annular cofferdam structure, the inclined support is arranged on the side portion of the cross-shaped support, and the two ends of the inclined support are both fixed to the inner plate; the damping part is located outside the annular cofferdam structure and fixed to the outer plate. Potential damage of vibration to the annular cofferdam structure is reduced, the stability and durability of the cofferdam are enhanced, and the safety of the cofferdam under various environmental conditions is improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel cofferdams, and in particular to a steel cofferdam structure for first piling and then weir construction and a construction and installation method thereof. Background Art

[0002] Steel cofferdam is a temporary retaining steel structure built for the construction of permanent water conservancy facilities in water conservancy project construction. Its main function is to prevent water and soil from entering the construction location of the building so as to drain water, excavate foundation pits and build buildings in the cofferdam. The design and construction of steel cofferdams need to take into account their stability and safety to ensure the smooth progress of the project. The structural design of steel cofferdams is usually a spatial box structure, and its main force system includes a vertical steel box and a horizontal frame system. Common types of steel cofferdams include double-walled bottom plate steel box cofferdams, which are designed as double-wall structures and supplemented by truss support systems inside. In addition, there are single-walled steel box cofferdams, steel sheet pile cofferdams, lock steel pipe pile cofferdams, steel hanging box cofferdams, etc., which are suitable for different engineering conditions and needs. Steel cofferdams have a wide range of uses and are suitable for various water conservancy projects, including bridges, tunnels, hydropower stations, etc. The steel cofferdam structure of piles first and then weirs is a construction method in which the construction sequence of steel cofferdams is carried out after the bored pile construction. This method is usually used in sandy clay geological conditions. The bored piles are constructed by setting up a drilling platform first, and then the steel cofferdam is constructed. The advantage of this method is that the construction quality of the bored piles is easy to control, and the physical engineering of the bored piles is completed first, and the visual progress is also good.

[0003] In the existing technology, steel cofferdam structures often have problems such as insufficient structural strength, poor stability and unsatisfactory shock absorption when facing complex water environments. Traditional cofferdam structures are prone to deformation or instability when subjected to water flow impact and pressure, leading to construction safety hazards. Existing cofferdam structures usually lack effective shock absorption measures and cannot effectively cope with the dynamic changes of water flow, thus affecting the stability and safety of the construction process.

[0004] Therefore, it is necessary to provide a steel cofferdam structure for first piling and then weir and a construction and installation method thereof to solve the problems of poor stability and poor impact resistance of the steel cofferdam structure in the prior art. Summary of the invention

[0005] In view of this, the present invention proposes a steel cofferdam structure for first piling and then weir and a construction and installation method thereof, aiming to solve the problems of poor stability and poor impact resistance of the steel cofferdam structure in the prior art.

[0006] On the one hand, the present invention provides a steel cofferdam structure for piling first and then weir, comprising:

[0007] A plurality of wall panels are provided, and the plurality of wall panels are sequentially connected to form an annular cofferdam structure; wherein the wall panels include an inner panel, an outer panel and a horizontal bracket, the inner panel and the outer panel are arranged in parallel, and the horizontal bracket is fixed between the inner panel and the outer panel;

[0008] A bulkhead plate is arranged between the inner plate and the outer plate so as to divide the annular cofferdam structure into a plurality of cabins;

[0009] There are several inner supports, which are fixed to the inner plate in sequence from top to bottom; wherein the inner supports include a cross support and an oblique support, the cross support is arranged in the middle of the annular cofferdam structure, the oblique support is arranged on the side of the cross support, and both ends of the oblique support are fixed to the inner plate;

[0010] The shock absorbing part is located outside the annular cofferdam structure and is fixed on the outer plate.

[0011] Furthermore, the shock absorbing part comprises:

[0012] A fixing plate fixed to the outer plate;

[0013] A shock absorbing spring is arranged on a side of the fixing plate away from the outer plate;

[0014] The special-shaped plate has one side arranged in a wave shape and one side arranged in a plane shape, and the plane-shaped side is connected to the shock-absorbing spring.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] First, the wall panels include inner panels, outer panels and horizontal brackets, providing a solid annular cofferdam structure. The parallel arrangement of the inner and outer panels and the fixing of the horizontal brackets enhance the overall stability and bearing capacity of the annular cofferdam structure, making it stronger and more resilient when subjected to external pressure. Secondly, the bulkheads divide the annular cofferdam structure into multiple cabins, effectively improving the isolation effect of the annular cofferdam structure, preventing the uniform impact of the water flow on the overall structure of the annular cofferdam, thereby reducing the risk of structural instability caused by uneven local pressure. The internal supports include cross braces and diagonal braces, which enhance the compressive capacity and overall stability of the annular cofferdam structure. The cross brace is located at the center of the annular cofferdam structure, providing uniform force distribution, while the diagonal brace further provides lateral support on both sides of the cross brace to prevent deformation or tilting of the structure. Finally, the setting of the external shock-absorbing part effectively absorbs and mitigates the impact of the water flow on the cofferdam structure, reduces the potential damage of vibration to the annular cofferdam structure, and not only enhances the stability and durability of the cofferdam, but also improves its safety under various environmental conditions.

[0017] On the other hand, the present application also provides a construction and installation method for a steel cofferdam structure with piles first and then weirs, comprising:

[0018] Collecting the water depth, setting the distance between the inner plate and the outer plate according to the water depth, fixing the inner plate, the outer plate and the horizontal bracket to form a plurality of wall plates;

[0019] splicing a plurality of the wall panels to sequentially connect them into a ring-shaped cofferdam structure, collecting water flow velocity, and determining the distance between every two bulkheads according to the water flow velocity;

[0020] Mounting the shock absorbing part on the outer plate;

[0021] Collecting water flow characteristics in the water area, and determining the distance between every two inner supports in the annular cofferdam structure according to the water flow characteristics;

[0022] The annular cofferdam structure is installed at a preset position in the water area by a hoisting mechanism.

[0023] Furthermore, the collecting of the water depth and setting the distance between the inner plate and the outer plate according to the water depth includes:

[0024] In the early stage of construction, the water depth is collected to form a water depth distribution map;

[0025] The distance between the inner plate and the outer plate is calculated according to the following formula:

[0026] d=Pw*H / Sy;

[0027] In the above formula, d represents the distance between the inner plate and the outer plate, and Pw represents the density of water. Pw = 1000 kg / m 3 , H represents the water depth, and Sy represents the yield strength of the outer plate.

[0028] Furthermore, when collecting the water depth and forming a water depth distribution map, it includes:

[0029] The ultrasonic depth sounder is used to measure the depth of the target water area to obtain water depth data;

[0030] Combined with GPS positioning system, record the GPS coordinate information of each measuring point;

[0031] Import the water depth data and GPS coordinate information into mapping and data analysis software to draw a water depth distribution map.

[0032] Furthermore, the collecting of water flow velocity and determining the distance between each two bulkheads according to the water flow velocity includes:

[0033] Conduct multi-point measurements in the target water area at the same time, collect the water flow velocity at multiple measurement points, and obtain the average water flow velocity at the same time;

[0034] Sampling is performed at multiple time points, and the average water flow speed at different time points is calculated, and the maximum average water flow speed is obtained by comparison. The maximum average water flow speed is used as the final water flow speed to determine the distance between each two bulkheads.

[0035] Furthermore, when the maximum value of the average water flow velocity is used as the final water flow velocity to determine the distance between every two bulkheads, the method includes:

[0036] The distance between each two bulkheads is calculated according to the following formula:

[0037] D = K·S / (Vmax·P);

[0038] In the above formula, D represents the distance between every two bulkheads, K represents the adjustment coefficient, 0.5≤K≤1, S represents the structural stress bearing capacity of the outer plate, Vmax represents the maximum average velocity of the water flow, and P represents the water flow pressure.

[0039] Furthermore, the water flow characteristics include the water flow rate and the maximum value of the average velocity of the water flow.

[0040] Furthermore, the collecting of water flow characteristics in the water area and determining the distance between every two inner supports in the annular cofferdam structure according to the water flow characteristics includes:

[0041] Monitor water flow in real time and draw a line graph of water flow changes;

[0042] The highest point in the line graph is selected as the final water flow rate, and the distance between every two inner supports in the annular cofferdam structure is obtained in combination with the maximum value of the average water flow velocity.

[0043] Furthermore, the selecting the highest point in the line graph as the final water flow rate and obtaining the distance between every two inner supports in the annular cofferdam structure in combination with the maximum value of the average water flow velocity includes:

[0044] The distance between every two inner supports in the annular cofferdam structure is calculated according to the following formula:

[0045] L = S / (ρ × Qmax × Vmax);

[0046] In the above formula, L represents the distance between every two inner supports in the annular cofferdam structure, S represents the structural stress bearing capacity of the outer plate, Qmax represents the final water flow rate, and Vmax represents the maximum average water flow velocity.

[0047] It can be understood that, first of all, collecting water depth data, calculating and determining the reasonable distance between the inner plate and the outer plate, can ensure the structural strength and stability of the wall panel. The inner plate, outer plate and horizontal bracket are fixed together to form a plurality of wall panels, and these wall panels are spliced ​​in sequence to assemble into a complete annular cofferdam structure. Next, the water flow velocity data of multiple measuring points are collected, and the average value is calculated to determine the appropriate distance between each two bulkheads, ensuring that the bulkheads can effectively separate the cabin inside the cofferdam, and optimize the distribution of water flow, reducing the impact on the annular cofferdam structure. Then, the shock-absorbing component is fixed on the outer plate to absorb and reduce the impact and vibration of the water flow on the annular cofferdam structure, further enhancing the stability and durability of the annular cofferdam structure. After completing the installation of the shock-absorbing part, the water flow characteristics in the water area are collected to determine the optimal distance between each two inner supports in the annular cofferdam structure, optimize the layout of the inner supports, and improve the overall compressive capacity of the annular cofferdam structure. Finally, the completed annular cofferdam structure was accurately installed at the preset position in the water area through the lifting mechanism. The entire installation process ensured the stability and reliability of the annular cofferdam structure in the actual construction environment, which not only improved the engineering efficiency of the annular cofferdam structure, but also ensured its safety and applicability in complex water conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0049] Figure 1 A schematic structural diagram of a steel cofferdam structure for first piling and then weir provided in an embodiment of the present invention;

[0050] Figure 2 A flow chart of a construction and installation method for a steel cofferdam structure with piles first and weirs later provided in an embodiment of the present invention;

[0051] In the figure, 100, wall panel; 110, inner panel; 120, outer panel; 130, horizontal bracket; 200, bulkhead panel; 300, inner support; 310, cross brace; 320, diagonal brace; 400, shock absorbing part; 410, fixing plate; 420, shock absorbing spring; 430, special-shaped plate. DETAILED DESCRIPTION

[0052] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] In the existing technology, steel cofferdam structures usually face the challenges of insufficient structural strength, poor stability and poor shock absorption when dealing with complex water environments. When subjected to the impact and pressure of water flow, traditional cofferdam structures are prone to deformation or instability, which in turn brings hidden dangers to construction safety. In addition, the existing cofferdam structure lacks effective shock absorption measures and cannot fully cope with the dynamic changes of water flow, making it difficult to ensure stability and safety during construction.

[0054] Therefore, in view of the problems existing in the prior art, it is necessary to provide a steel cofferdam structure for piling first and then weir and a construction and installation method thereof to reduce the potential damage of vibration to the annular cofferdam structure, enhance the stability and durability of the cofferdam, and improve its safety under various environmental conditions.

[0055] In some embodiments of the present application, see Figure 1 As shown, this embodiment provides a steel cofferdam structure for first piling and then weir, including:

[0056] A plurality of wall panels 100 are provided, and the plurality of wall panels 100 are sequentially connected to form an annular cofferdam structure; wherein the wall panel 100 comprises an inner panel 110, an outer panel 120 and a horizontal bracket 130, the inner panel 110 and the outer panel 120 are arranged in parallel, and the horizontal bracket 130 is fixed between the inner panel 110 and the outer panel 120;

[0057] The bulkhead plate 200 is arranged between the inner plate 110 and the outer plate 120 so as to divide the annular cofferdam structure into a plurality of cabins;

[0058] There are several inner supports 300, which are fixed on the inner plate 110 in sequence from top to bottom; wherein the inner supports 300 include a cross support 310 and an oblique support 320, the cross support 310 is arranged in the middle of the annular cofferdam structure, the oblique support 320 is arranged on the side of the cross support 310, and both ends of the oblique support 320 are fixed to the inner plate 110;

[0059] The shock absorbing part 400 is located outside the annular cofferdam structure and is fixed on the outer plate 120 .

[0060] It is understandable that the wall panel 100 in the present invention includes an inner plate 110, an outer plate 120 and a horizontal bracket 130, providing a sturdy annular cofferdam structure. The parallel arrangement of the inner and outer plates 120 and the fixation of the horizontal bracket 130 enhance the overall stability and bearing capacity of the annular cofferdam structure, making it stronger and more resilient when subjected to external pressure. Secondly, the bulkhead 200 divides the annular cofferdam structure into multiple cabins, effectively improving the isolation effect of the annular cofferdam structure, preventing the uniform impact of water flow on the overall structure of the annular cofferdam, thereby reducing the risk of structural instability caused by uneven local pressure. The inner support 300 includes a cross support 310 and a diagonal support 320, which enhances the compressive strength and overall stability of the annular cofferdam structure. The cross support 310 is located at the center of the annular cofferdam structure, providing uniform force distribution, while the diagonal support 320 further provides lateral support on both sides of the cross support 310 to prevent deformation or tilting of the structure. Finally, the setting of the external shock absorbing part 400 effectively absorbs and slows down the impact of the water flow on the cofferdam structure, reduces the potential damage of vibration to the annular cofferdam structure, and not only enhances the stability and durability of the cofferdam, but also improves its safety under various environmental conditions. Specifically, the number of shock absorbing parts 400 is not specifically limited.

[0061] In some embodiments of the present application, the shock absorbing part 400 includes:

[0062] A fixing plate 410 fixed on the outer plate 120;

[0063] A shock absorbing spring 420 is arranged on a side of the fixing plate 410 away from the outer plate 120;

[0064] The special-shaped plate 430 has one side configured to be wavy and the other side configured to be flat, and the flat side is connected to the shock-absorbing spring 420 .

[0065] It is understandable that the fixed plate 410 provides a solid foundation for the shock absorbing system by being firmly mounted on the outer plate 120. Secondly, the shock absorbing spring 420 is mounted on the side of the fixed plate 410 away from the outer plate 120, which can effectively absorb and alleviate the impact and vibration of the water flow and reduce the direct effect of the external water pressure on the annular cofferdam structure. The wavy side of the special-shaped plate 430 can further disperse the impact force, and the flat side is connected to the shock absorbing spring 420 to form a flexible buffer structure, which not only enhances the overall stability of the cofferdam, but also reduces the risk of structural fatigue and deformation, prolongs the service life of the cofferdam, and improves construction safety.

[0066] On the other hand, see Figure 2 As shown, the present application also provides a construction and installation method for a steel cofferdam structure with piles first and then weirs, which is applied to the above-mentioned steel cofferdam structure with piles first and then weirs, and is characterized in that it includes the following steps:

[0067] S10, collecting the water depth, setting the distance between the inner plate 110 and the outer plate 120 according to the water depth, fixing the inner plate 110, the outer plate 120 and the horizontal bracket 130 to form a plurality of wall panels 100;

[0068] S20, splicing a plurality of wall panels 100 to sequentially connect them into an annular cofferdam structure, collecting water flow velocity, and determining the distance between every two bulkhead panels 200 according to the water flow velocity;

[0069] S30, installing the shock absorbing part 400 on the outer plate 120;

[0070] S40, collecting water flow characteristics in the water area, and determining the distance between every two inner supports 300 in the annular cofferdam structure according to the water flow characteristics;

[0071] S50. Install the annular cofferdam structure at a preset position in the water area through a hoisting mechanism.

[0072] It can be understood that, first, the water depth data is collected, and the reasonable distance between the inner plate 110 and the outer plate 120 is calculated and determined, so as to ensure the structural strength and stability of the wall panel 100. The inner plate 110, the outer plate 120 and the horizontal bracket 130 are fixed together to form a plurality of wall panels 100, and these wall panels 100 are spliced ​​in sequence to assemble into a complete annular cofferdam structure. Next, the water flow velocity data of multiple measuring points are collected, and the average value thereof is calculated to determine the appropriate distance between every two bulkheads 200, so as to ensure that the bulkheads 200 can effectively separate the cabins inside the cofferdam, optimize the distribution of the water flow, and reduce the impact on the annular cofferdam structure. Then, the shock absorbing part 400 is fixed on the outer plate 120 to absorb and mitigate the impact and vibration of the water flow on the annular cofferdam structure, so as to further enhance the stability and durability of the annular cofferdam structure. After the installation of the shock-absorbing part 400 is completed, the water flow characteristics in the water area are collected to determine the optimal distance between every two inner supports 300 in the annular cofferdam structure, optimize the layout of the inner supports 300, and improve the overall compressive resistance of the annular cofferdam structure. Finally, the completed annular cofferdam structure is accurately installed to the preset position in the water area through the hoisting mechanism. The entire installation process ensures the stability and reliability of the annular cofferdam structure in the actual construction environment, which not only improves the engineering efficiency of the annular cofferdam structure, but also ensures its safety and applicability in complex water conditions.

[0073] In some embodiments of the present application, when collecting the water depth and setting the distance between the inner plate 110 and the outer plate 120 according to the water depth, the method includes:

[0074] In the early stage of construction, the water depth is collected to form a water depth distribution map;

[0075] The distance between the inner plate 110 and the outer plate 120 is calculated according to the following formula:

[0076] d=Pw*H / Sy;

[0077] In the above formula, d represents the distance between the inner plate 110 and the outer plate 120, and Pw represents the density of water. Pw = 1000 kg / m 3 , H represents the water depth, and Sy represents the yield strength of the outer plate 120.

[0078] It is understandable that by collecting the water depth and forming a depth distribution map, the construction party can fully understand the water depth conditions in the construction area. According to the water density, water depth and yield strength of the outer plate 120, the reasonable distance between the inner plate 110 and the outer plate 120 is calculated to ensure that the structure has the best compressive resistance under different depths and pressure conditions, which not only ensures the strength of the annular cofferdam structure, but also avoids excessive use of materials, improves economy and construction efficiency, and ensures that the annular cofferdam structure can work safely and stably for a long time in a complex water environment.

[0079] Specifically, yield strength refers to the yield point of metal materials, which is extremely unclear and difficult to measure. Therefore, in order to measure the yield characteristics of the material, the stress at which permanent residual plastic deformation equals a certain value (generally 0.2% of the original length) is specified.

[0080] In some embodiments of the present application, when collecting the water depth and forming a water depth distribution map, the process includes:

[0081] The ultrasonic depth sounder is used to measure the depth of the target water area to obtain water depth data;

[0082] Combined with GPS positioning system, record the GPS coordinate information of each measuring point;

[0083] Import the water depth data and GPS coordinate information into mapping and data analysis software to draw a water depth distribution map.

[0084] It is understandable that by using an ultrasonic depth sounder combined with a GPS positioning system, the depth data of the target water area and the location information of each measuring point can be accurately collected, greatly improving the accuracy and efficiency of the measurement. Importing the water depth data and GPS coordinate information into the mapping and data analysis software, and quickly drawing a water depth distribution map, helps to fully grasp the changes in the water terrain. It not only provides accurate depth information, but also ensures the precise positioning of each measuring point, making the subsequent cofferdam design and installation more scientific and reasonable. Overall, this efficient and accurate data collection and analysis process reduces construction risks, optimizes engineering scheme design, and improves construction safety and engineering quality.

[0085] Specifically, mapping and data analysis software include GIS, AutoCAD and ArcGIS.

[0086] In some embodiments of the present application, when collecting the water flow velocity and determining the distance between every two bulkheads 200 according to the water flow velocity, the method includes:

[0087] Conduct multi-point measurements in the target water area at the same time, collect the water flow velocity at multiple measurement points, and obtain the average water flow velocity at the same time;

[0088] Sampling is performed at multiple time points, and the average water flow velocity at different time points is calculated. The maximum average water flow velocity is obtained by comparison, and the maximum average water flow velocity is used as the final water flow velocity to determine the distance between every two bulkheads 200.

[0089] It is understandable that by simultaneously conducting multi-point measurements in the target water area and collecting the water flow velocity at multiple measurement points, the dynamic characteristics of the water flow can be more comprehensively reflected. By calculating the average water flow velocity at the same time, the reliability and representativeness of the measurement data are ensured. At the same time, sampling at multiple time points and calculating the average water flow velocity can capture the changing trend of the water flow velocity, and obtain the maximum value through comparison, which is used as the final water flow velocity. This not only takes into account the temporal and spatial changes of the water flow and improves the accuracy of the design, but also ensures that under the most severe water flow conditions, the 200-degree spacing of the bulkhead can withstand the maximum water flow impact, further enhancing the stability and safety of the steel cofferdam structure and avoiding the risk of structural instability caused by excessive local water flow.

[0090] In some embodiments of the present application, when the maximum value of the average water flow velocity is used as the final water flow velocity to determine the distance between every two bulkheads 200, it includes:

[0091] The distance between every two bulkheads 200 is calculated according to the following formula:

[0092] D = K·S / (Vmax·P);

[0093] In the above formula, D represents the distance between every two bulkheads 200, K represents the adjustment coefficient, 0.5≤K≤1, S represents the structural stress bearing capacity of the outer plate 120, Vmax represents the maximum value of the average water flow velocity, and P represents the water flow pressure.

[0094] It can be understood that by calculating the distance between every two bulkheads 200, the safety and design rationality of the cofferdam structure are improved. Comprehensively consider key factors such as the maximum average velocity of the water flow and the water flow pressure to ensure that the spacing of the bulkheads 200 can adapt to the maximum water flow impact. At the same time, the adjustment coefficient K provides flexibility and can be fine-tuned according to different water conditions to ensure the safety and stability of the structure under different environments. Specifically, the K value decreases as the water flow velocity increases, ensuring that under high-speed water flow conditions, the cofferdam structure can withstand greater impact and remain stable. The structural stress bearing capacity of the outer plate 120 is included in the calculation so that it can not only withstand the water flow pressure, but also give full play to the strength characteristics of the material. The spacing design of the bulkheads 200 is more scientific, which effectively improves the compressive resistance of the annular cofferdam structure and ensures its durability and safety in a strong water flow environment. Specifically, P = ρgh; structural stress bearing capacity refers to the maximum stress that a structure can withstand without damage or permanent deformation.

[0095] In some embodiments of the present application, the water flow characteristics include the water flow rate and the maximum average water flow velocity.

[0096] It is understandable that the combination of water flow and the maximum average water velocity can more comprehensively reflect the hydrodynamic conditions in the water area and provide a scientific basis for the design of the cofferdam structure. The water flow reflects the scale of the overall water flow, while the maximum average water velocity represents the maximum impact force of the local water flow on the structure. The combination of the two can more accurately calculate the required compressive strength and stability of the structure. In addition, through a comprehensive analysis of the water flow characteristics, the layout of the internal support 300 can be optimized, so that the annular cofferdam structure can maintain stability and safety under different water flow conditions, avoiding structural failure or damage caused by water flow fluctuations, thereby improving the reliability and service life of the construction.

[0097] In some embodiments of the present application, when collecting water flow characteristics in the water area and determining the distance between every two inner supports 300 in the annular cofferdam structure according to the water flow characteristics, the method includes:

[0098] Monitor water flow in real time and draw a line graph of water flow changes;

[0099] The highest point in the line graph is selected as the final water flow rate, and the distance between every two inner supports 300 in the annular cofferdam structure is obtained in combination with the maximum average water flow velocity.

[0100] It is understandable that real-time monitoring and line chart analysis can reflect the dynamic changes of water flow, ensure that the maximum possible water flow impact force is taken into account, and thus enhance the safety of the structure. By selecting the highest flow point as the basis, it can be ensured that the cofferdam structure can still operate stably under the most unfavorable conditions. Secondly, combined with the maximum average water flow velocity, the distance between every two inner supports of 300 can be accurately determined, thereby effectively dispersing the water flow impact force, optimizing the layout of the support structure, avoiding local overload or stress concentration, and improving the overall impact resistance of the cofferdam. It can significantly improve the stability and durability of the cofferdam, adapt to the complex environmental conditions of different waters, and ensure the safety and service life of the project.

[0101] In some embodiments of the present application, the highest point in the line graph is selected as the final water flow rate, and the distance between every two inner supports 300 in the annular cofferdam structure is obtained in combination with the maximum value of the average water flow velocity, including:

[0102] The distance between every two inner supports 300 in the annular cofferdam structure is calculated according to the following formula:

[0103] L = S / (ρ × Qmax × Vmax);

[0104] In the above formula, L represents the distance between every two inner supports 300 in the annular cofferdam structure, S represents the structural stress bearing capacity of the outer plate 120, Qmax represents the final water flow rate, and Vmax represents the maximum average water flow velocity.

[0105] It is understandable that by considering the structural stress bearing capacity of the outer plate 120, the final water flow rate and the maximum average water flow velocity, the impact force of the water flow on the annular cofferdam structure and the bearing capacity of the annular cofferdam structure itself can be fully considered. By calculating the distance between every two inner supports 300, the support layout is more reasonable, which can effectively disperse the water flow pressure and prevent local excessive load from causing structural instability. Secondly, determining the support distance based on the water flow characteristics can provide sufficient support strength under adverse water flow conditions to ensure the overall stability of the cofferdam structure. By combining the two core elements of water flow and water flow velocity, the design of the structure is optimized, the impact resistance and service life of the cofferdam in complex water environments are improved, and a strong guarantee is provided for the safety of the cofferdam project.

[0106] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0107] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0108] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0109] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A steel cofferdam structure for piling first and then weir, characterized in that: include: A plurality of wall panels are provided, and the plurality of wall panels are sequentially connected to form an annular cofferdam structure; wherein the wall panels include an inner panel, an outer panel and a horizontal bracket, the inner panel and the outer panel are arranged in parallel, and the horizontal bracket is fixed between the inner panel and the outer panel; A bulkhead plate is arranged between the inner plate and the outer plate so as to divide the annular cofferdam structure into a plurality of cabins; There are several inner supports, which are fixed to the inner plate in sequence from top to bottom; wherein the inner supports include a cross support and an oblique support, the cross support is arranged in the middle of the annular cofferdam structure, the oblique support is arranged on the side of the cross support, and both ends of the oblique support are fixed to the inner plate; The shock absorbing part is located outside the annular cofferdam structure and is fixed on the outer plate.

2. The steel cofferdam structure for piling first and then weir according to claim 1 is characterized in that: The shock absorbing part comprises: A fixing plate fixed to the outer plate; A shock absorbing spring is arranged on a side of the fixing plate away from the outer plate; The special-shaped plate has one side arranged in a wave shape and one side arranged in a plane shape, and the plane-shaped side is connected to the shock-absorbing spring.

3. A construction and installation method for a steel cofferdam structure with piles first and then weirs, applied to the steel cofferdam structure with piles first and then weirs as claimed in any one of claims 1-2, characterized in that: include: Collecting the water depth, setting the distance between the inner plate and the outer plate according to the water depth, fixing the inner plate, the outer plate and the horizontal bracket to form a plurality of wall plates; splicing a plurality of the wall panels to sequentially connect them into a ring-shaped cofferdam structure, collecting water flow velocity, and determining the distance between every two bulkheads according to the water flow velocity; Mounting the shock absorbing part on the outer plate; Collecting water flow characteristics in the water area, and determining the distance between every two inner supports in the annular cofferdam structure according to the water flow characteristics; The annular cofferdam structure is installed at a preset position in the water area by a hoisting mechanism.

4. The construction and installation method for a steel cofferdam structure with piles first and then weirs according to claim 3 is characterized in that: The collecting of the water depth and setting the distance between the inner plate and the outer plate according to the water depth includes: In the early stage of construction, the water depth is collected to form a water depth distribution map; The distance between the inner plate and the outer plate is calculated according to the following formula: d=Pw*H / Sy; In the above formula, d represents the distance between the inner plate and the outer plate, and Pw represents the density of water. Pw = 1000 kg / m 3 , H represents the water depth, and Sy represents the yield strength of the outer plate.

5. The construction and installation method for a steel cofferdam structure with piles first and then weirs according to claim 4 is characterized in that: When collecting water depth and forming a water depth distribution map, it includes: The ultrasonic depth sounder is used to measure the depth of the target water area to obtain water depth data; Combined with GPS positioning system, record the GPS coordinate information of each measuring point; Import the water depth data and GPS coordinate information into mapping and data analysis software to draw a water depth distribution map.

6. The construction and installation method for a steel cofferdam structure of first piling and then weir according to claim 5 is characterized in that: The collecting of water flow velocity and determining the distance between each two bulkheads according to the water flow velocity comprises: Conduct multi-point measurements in the target water area at the same time, collect the water flow velocity at multiple measurement points, and obtain the average water flow velocity at the same time; Sampling is performed at multiple time points, and the average water flow speed at different time points is calculated, and the maximum average water flow speed is obtained by comparison. The maximum average water flow speed is used as the final water flow speed to determine the distance between each two bulkheads.

7. The construction and installation method for a steel cofferdam structure of first piling and then weir according to claim 6 is characterized in that: When the maximum value of the average water flow velocity is used as the final water flow velocity to determine the distance between every two bulkheads, the method includes: The distance between each two bulkheads is calculated according to the following formula: D = K·S / (Vmax·P); In the above formula, D represents the distance between every two bulkheads, K represents the adjustment coefficient, 0.5≤K≤1, S represents the structural stress bearing capacity of the outer plate, Vmax represents the maximum average velocity of the water flow, and P represents the water flow pressure.

8. The construction and installation method for the steel cofferdam structure of first piling and then weir according to claim 7, It is characterized in that The water flow characteristics include the water flow rate and the maximum value of the average velocity of the water flow.

9. The construction and installation method for a steel cofferdam structure of first piling and then weir according to claim 8 is characterized in that: The collecting of water flow characteristics in the water area and determining the distance between every two inner supports in the annular cofferdam structure according to the water flow characteristics includes: Monitor water flow in real time and draw a line graph of water flow changes; The highest point in the line graph is selected as the final water flow rate, and the distance between every two inner supports in the annular cofferdam structure is obtained in combination with the maximum value of the average water flow velocity.

10. The construction and installation method for a steel cofferdam structure of first piling and then weir according to claim 9, characterized in that: The method of selecting the highest point in the line graph as the final water flow rate and obtaining the distance between every two inner supports in the annular cofferdam structure in combination with the maximum value of the average water flow velocity includes: The distance between every two inner supports in the annular cofferdam structure is calculated according to the following formula: L = S / (ρ × Qmax × Vmax); In the above formula, L represents the distance between every two inner supports in the annular cofferdam structure, S represents the structural stress bearing capacity of the outer plate, Qmax represents the final water flow rate, and Vmax represents the maximum average water flow velocity.

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