Deepwater bottom-sealing-free double-wall steel cofferdam lowering inclination early warning and deviation correcting system and method

Abstract

The invention belongs to the technical field of early warning and deviation correction for lowering inclination of a steel cofferdam, and relates to an early warning and deviation correction system and method for lowering inclination of a deepwater double-wall steel cofferdam without a sealing bottom. According to the method, by evaluating the potential influence of the environment where the target double-wall steel cofferdam without the back cover is located, inclination, caused by environmental factors, of the double-wall steel cofferdam without the back cover in the lowering process is reduced, and it is also avoided that constructors work in the dangerous environment; the inclination reason is analyzed in a multi-dimensional manner by judging the inclination early warning requirement and the inclination correction requirement of the target bottom section of the double-wall steel cofferdam without the back cover and the current heightening section as well as the inclination early warning requirement and the inclination correction requirement of the target bottom section of the double-wall steel cofferdam without the back cover when the target bottom section of the double-wall steel cofferdam is put down at present; whether the bottom section of the steel cofferdam is abnormally inclined or not can be conveniently perceived at the first time, constructors are reminded to take measures, serious safety accidents such as structural damage and even collapse caused by excessive inclination of the steel cofferdam are avoided, and damage to the structure of the steel cofferdam due to inclination of the bottom section is also avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of steel cofferdam lowering tilt warning and correction, and relates to a deepwater bottomless double-wall steel cofferdam lowering tilt warning and correction system and method. Background Art

[0002] With the continuous development of transportation infrastructure construction, more and more bridges need to cross wide rivers, bays and other deep-water areas. In these projects, deep-water bottomless double-walled steel cofferdams are widely used in bridge foundation construction and other fields as a common construction technology to create a relatively dry and stable construction environment for subsequent pile foundation, pier and other construction work. However, in deep-water environments, factors such as water flow velocity, water pressure, complexity of riverbed geological conditions, and the huge size and weight of the steel cofferdam itself during the lowering process can easily cause the steel cofferdam to tilt during the lowering process.

[0003] In the prior art, there are also some solutions related to analyzing the tilt warning and correction during the lowering of steel cofferdams. For example, the invention patent application of a system and method for tilt warning and correction during the lowering of a steel cofferdam with Chinese patent publication number CN118087569A, which uses a detection device with simple structure and easy operation to comprehensively convert the influence of wind flow, water flow and other factors on the positioning construction of the steel cofferdam during construction into the influence of the cable length value and the rope output speed, and accurately measures the rope pulling and pulling angle and the steel cofferdam inclination sensor to monitor the inclination angle at the four corners of the steel cofferdam according to the cable inclination sensor. After analysis and processing, it is compared with the preset offset threshold, and then the winch is controlled to adjust the rope pulling and pulling speed to complete the correction, solving the problem that it is difficult to accurately control the lowering accuracy of conventional steel cofferdam hoisting and lowering; the determination method adopted by the present invention can achieve better detection effect without using large equipment, saves engineering cost, and is easy to promote; at the same time, it can avoid the use of large lifting equipment in the hoisting process of ordinary steel cofferdams, reducing construction costs.

[0004] Another invention patent application for an automatic water injection correction system and method for a cofferdam with a Chinese patent publication number of CN116005697A solves the problem that the water level monitoring and control at any time during the sinking and water injection of the cofferdam needs a dedicated person, which is inefficient, and the process control accuracy is low, which is easy to cause errors. Inclinometers are set at the four corners of the cofferdam. The inclinometers are used to monitor the tilt state of the cofferdam. The data transceiver is used to collect real-time data monitored by the inclinometer and transmit the data to the centralized controller. The centralized controller analyzes and processes the above data and compares it with the built-in warning value of the system, and sends a turn-on or turn-off instruction to the water injection solenoid valve; the water injection pipeline is set along the cofferdam, and the lower end of the water injection pipeline is provided with a branch water injection pipe corresponding to the position of each water injection tank. The water injection solenoid valve is set on the branch water injection pipe to control the water injection of the water injection tank. The present invention can realize accurate automatic correction of the cofferdam when it sinks.

[0005] Although the above scheme proposes some solutions for tilt warning and correction during the lowering process of the steel cofferdam, there are still certain limitations: on the one hand, some existing technologies obtain the difference between the rope pulling angle and the inclination angle of the steel cofferdam at the four corners of the steel cofferdam and the preset offset threshold after analysis and processing, and then control the winch to adjust the rope pulling speed to complete the correction. However, it lacks analysis of the potential influence of the environment in which the steel cofferdam is located on its inclination, and also ignores the analysis of the cause of the tilt from multiple dimensions such as compartment pressure and lowering speed, and cannot timely and accurately detect whether the bottom section of the steel cofferdam is abnormally tilted at the first time.

[0006] On the other hand, some existing technologies detect and analyze the inclination of the cofferdam during the sinking and water filling process, but ignore the detection and analysis of the inclination during the entire lowering process of the steel cofferdam, so that it is impossible to ensure whether the steel cofferdam as a whole is tilted, and it is impossible to ensure the connection accuracy between the sections of the steel cofferdam and the overall verticality. Summary of the invention

[0007] In view of this, in order to solve the problems raised in the above background technology, a system and method for early warning and correcting the lowering tilt of a deepwater bottomless double-walled steel cofferdam is proposed.

[0008] The purpose of the present invention can be achieved through the following technical solutions: The first aspect of the present invention provides a deep-water bottomless double-walled steel cofferdam lowering tilt warning and correction system, including: an environmental data acquisition module, a bottom section lowering operation data analysis module, a lowering operation data acquisition module, a lowering operation data analysis module, a tilt warning and correction module and a database.

[0009] The environmental data acquisition module is used to record the deepwater double-walled steel cofferdam without bottom to be monitored as the target double-walled steel cofferdam without bottom, obtain the environmental data of the environment in which the target double-walled steel cofferdam without bottom is located in real time, and evaluate the potential influence of the environment in which the target double-walled steel cofferdam without bottom is located.

[0010] The bottom section lowering operation data analysis module is used to obtain the lowering operation data of the target bottom section of the double-walled steel cofferdam without a bottom in real time, and judge the inclination warning demand and inclination correction demand of the bottom section of the target double-walled steel cofferdam without a bottom based on this. If it is a warning demand or a correction demand, the inclination warning and correction module is executed; otherwise, the lowering operation data collection module is executed.

[0011] The lowering operation data acquisition module is used to obtain the lowering operation data of the current connecting section of the target bottom-less double-walled steel cofferdam and the current inclination data of the bottom section of the target bottom-less double-walled steel cofferdam in real time.

[0012] The decentralized operation data analysis module is used to respectively determine the tilt warning demand and tilt correction demand of the current connecting high section of the target double-walled steel cofferdam without a bottom, as well as the tilt warning demand and tilt correction demand of the current decentralized bottom section of the target double-walled steel cofferdam without a bottom. If it is a warning demand or a correction demand, the tilt warning and correction module is executed; otherwise, the decentralized operation data collection module is executed.

[0013] The tilt warning and correction module is used to provide tilt warning and tilt correction for the bottom section of the target double-walled steel cofferdam without a bottom cover and the current connecting height section.

[0014] The database is used to store the length of each compartment of the bottom section of the target double-walled steel cofferdam without a bottom, and store the reference value of the tension of each cable, the reference value of the pressure of each compartment and the reference value of the lowering speed.

[0015] The second aspect of the present invention provides a method for warning and correcting the tilt of lowering a deepwater double-walled steel cofferdam without a bottom, comprising: S1, environmental data acquisition: recording the deepwater double-walled steel cofferdam without a bottom to be monitored as a target double-walled steel cofferdam without a bottom, acquiring the environmental data of the environment in which the target double-walled steel cofferdam without a bottom is located in real time, and evaluating the potential influence of the environment in which the target double-walled steel cofferdam without a bottom is located.

[0016] S2. Analysis of bottom section lowering operation data: real-time acquisition of the lowering operation data of the target bottom section of the double-walled steel cofferdam without bottom cover, and based on this, determine the tilt warning demand and tilt correction demand of the bottom section of the target double-walled steel cofferdam without bottom cover; if it is a warning demand or a correction demand, execute S5; otherwise, execute S3.

[0017] S3. Collection of lowering operation data: real-time acquisition of lowering operation data of the current connecting high section of the target double-walled steel cofferdam without bottom and current inclination data of the bottom section of the target double-walled steel cofferdam without bottom.

[0018] S4. Analysis of the lowering operation data: respectively determine the tilt warning demand and tilt correction demand of the current connecting high section of the target double-walled steel cofferdam without a bottom, and the tilt warning demand and tilt correction demand of the current lowering bottom section of the target double-walled steel cofferdam without a bottom. If a warning demand or a correction demand is required, execute S5; otherwise, execute S3.

[0019] S5. Tilt warning and correction: Provide tilt warning and tilt correction for the bottom section of the target double-walled steel cofferdam without bottom cover and the current connecting height section.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention obtains the environmental data of the environment in which the target double-walled steel cofferdam with no bottom is located in real time, and evaluates the potential influence of the environment in which the target double-walled steel cofferdam with no bottom is located. By accurately grasping the environmental data and potential influence, the inclination of the double-walled steel cofferdam with no bottom during the lowering process caused by environmental factors is reduced. On the other hand, it also avoids the construction workers from working in a dangerous environment, which is beneficial to protecting the lives of the construction workers.

[0021] 2. The present invention obtains the lowering operation data of the target bottom section of the double-walled steel cofferdam without a bottom in real time, and judges the tilt warning demand and tilt correction demand of the bottom section of the target double-walled steel cofferdam without a bottom based on the data, and analyzes the cause of the tilt from multiple dimensions such as the tilt data of the bottom section of the target double-walled steel cofferdam without a bottom and the construction process data, so as to detect whether the bottom section of the steel cofferdam is abnormally tilted at the first time, and remind the construction personnel to take measures to avoid serious safety accidents such as structural damage or even collapse of the steel cofferdam due to excessive tilt.

[0022] 3. The present invention helps to grasp the overall inclination state of the steel cofferdam in real time, make timely warnings and corrections, and monitor the current inclination of the bottom section of the target double-walled steel cofferdam without a bottom in the process of lowering the current high section of the target double-walled steel cofferdam without a bottom, thereby avoiding damage to the steel cofferdam structure due to the inclination of the bottom section, ensuring the connection accuracy between the sections and the overall verticality, and improving the project quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of system module connection of the present invention.

[0025] Figure 2 It is a schematic diagram for implementing the method steps of the present invention.

[0026] Figure 3 The present invention is a flowchart of the lowering operation of the deepwater bottomless double-wall steel cofferdam. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] See also Figure 1 As shown, the present invention provides a system for lowering inclination warning and correction of double-walled steel cofferdam without bottom in deep water, and the specific modules are distributed as follows: environmental data acquisition module, bottom section lowering operation data analysis module, lowering operation data acquisition module, lowering operation data analysis module, inclination warning and correction module and database. Among them, the connection mode between the modules is: the environmental data acquisition module is connected with the bottom section lowering operation data analysis module, the bottom section lowering operation data analysis module is respectively connected with the lowering operation data acquisition module and the inclination warning and correction module, the lowering operation data acquisition module is connected with the lowering operation data analysis module, the lowering operation data analysis module is connected with the inclination warning and correction module, and the database is respectively connected with the bottom section lowering operation data analysis module and the lowering operation data analysis module.

[0030] It is necessary to further explain that the flow chart of the lowering operation of the deepwater bottomless double-walled steel cofferdam is as follows: Figure 3 shown.

[0031] The environmental data acquisition module is used to record the deepwater double-walled steel cofferdam without bottom to be monitored as the target double-walled steel cofferdam without bottom, obtain the environmental data of the environment in which the target double-walled steel cofferdam without bottom is located in real time, and evaluate the potential influence of the environment in which the target double-walled steel cofferdam without bottom is located.

[0032] In a specific example, the environmental data of the target environment of the bottomless double-walled steel cofferdam includes terrain flatness, water flow velocity and water flow impact force.

[0033] It needs to be further explained that the specific method of obtaining the terrain flatness, water flow velocity and water flow impact force of the target environment without a bottom double-walled steel cofferdam is: using side-scan sonar to detect the surface characteristics of the riverbed, and drawing an underwater topography map of the environment where the target double-walled steel cofferdam without a bottom is located, and extracting the elevation of each detection point of the underwater topography map of the environment where the target double-walled steel cofferdam without a bottom is located, and calculating it according to the standard deviation formula to obtain the elevation standard deviation of the detection point of the underwater topography map of the environment where the target double-walled steel cofferdam without a bottom is located, and the reciprocal is recorded as the terrain flatness of the environment where the target double-walled steel cofferdam without a bottom is located.

[0034] It should be noted that the side scan sonar is an effective underwater imaging technology, which is widely used in the fields of seabed topography mapping, shipwreck positioning, pipeline laying and detection of riverbed surface features.

[0035] The water flow velocity in the environment of the target open-bottom double-walled steel cofferdam is directly measured using the deployed flowmeter.

[0036] The pressure sensors arranged on the steel cofferdam are used to directly measure the water flow impact force in the environment where the target double-walled steel cofferdam with no bottom is located.

[0037] As a preferred feasibility example, the specific analysis method of the potential influence of the environment where the target double-walled steel cofferdam without bottom is located is: extracting the terrain flatness of the environment where the target double-walled steel cofferdam without bottom is located from the environmental data , water flow speed and water impact .

[0038] According to the analytical formula Get the potential influence of the environment where the target double-walled steel cofferdam is located ,in are the terrain flatness threshold, maximum water flow velocity and maximum water flow impact force of the environment where the target is located without affecting the lowering of the double-walled steel cofferdam without bottom cover. They are the minimum values ​​set to prevent the denominator from being 0, and their units are meters per second and Newton respectively.

[0039] It should be further explained that the flatness of the terrain directly affects the stability and verticality of the cofferdam during lowering. If the terrain is uneven, the cofferdam may tilt during lowering due to uneven force.

[0040] The water flow velocity directly affects the hydrodynamic load on the cofferdam. A higher water flow velocity will increase the water flow impact force on the cofferdam sidewall, which may cause the cofferdam to deflect or tilt during the lowering process.

[0041] The water flow impact force is a direct result of the water flow velocity, but it more directly reflects the mechanical effect of the water flow on the cofferdam. A larger water flow impact force will cause the side wall of the cofferdam to be subjected to greater lateral pressure, which may cause the cofferdam to tilt during the lowering process.

[0042] When writing the formula for the potential influence of the environment on the target double-walled steel cofferdam without a bottom, a quantitative method is mainly used to analyze the potential influence of terrain flatness, water flow velocity and water flow impact force on the environment on the target double-walled steel cofferdam without a bottom, and then to evaluate the impact of the environment on the downward inclination of the cofferdam.

[0043] Table 1 below is a calculation demonstration of the potential influence of the environment on the target open-bottom double-wall steel cofferdam.

[0044] Table 1 Demonstration table of potential influence calculation

[0045]

[0046] It can be found from the above table that the potential influence of the environment in which the target double-walled steel cofferdam with no bottom is located is the result of the combined effect of three key environmental parameters: terrain flatness, water flow velocity and water flow impact force. When the terrain flatness is smaller, the water flow velocity is greater and the water flow impact force is greater, the potential influence of the environment in which the target double-walled steel cofferdam with no bottom is greater, and the target double-walled steel cofferdam with no bottom is more likely to be affected by the environment, increasing the probability of tilting during the lowering process.

[0047] The present invention obtains the environmental data of the environment in which the target double-walled steel cofferdam with no bottom is located in real time, and evaluates the potential influence of the environment in which the target double-walled steel cofferdam with no bottom is located. By accurately grasping the environmental data and the potential influence, the inclination of the double-walled steel cofferdam with no bottom during the lowering process caused by environmental factors is reduced. On the other hand, it also avoids construction workers from working in a dangerous environment, which is beneficial to protecting the life safety of construction workers.

[0048] The bottom section lowering operation data analysis module is used to obtain the lowering operation data of the target bottom section of the double-walled steel cofferdam without a bottom in real time, and judge the inclination warning demand and inclination correction demand of the bottom section of the target double-walled steel cofferdam without a bottom based on this. If it is a warning demand or a correction demand, the inclination warning and correction module is executed; otherwise, the lowering operation data collection module is executed.

[0049] In a specific example, the lowering operation data of the target bottom section of the double-walled steel cofferdam without bottom cover and the current height connection section include inclination data and construction process data.

[0050] The tilt data include the tilt of each key point on the top and the depth of each deployment point.

[0051] It needs to be further explained that the specific method of obtaining the inclination of each key point of the bottom section of the target double-walled steel cofferdam without a bottom and the top of the current connecting height section and the lowering depth of each layout point is: using the deployed inclinometer to directly measure the inclination of each key point of the bottom section of the target double-walled steel cofferdam without a bottom and the top of the current connecting height section.

[0052] A GPS-RTK receiving antenna is installed on each layout point of the target bottom section of the double-walled steel cofferdam without a bottom and the current connecting high section, a base station is set up at a base point with a known elevation, the receiving antenna receives satellite signals, and differential processing is performed with the base station data to obtain the elevations of the target bottom section of the double-walled steel cofferdam without a bottom and each layout point of the current connecting high section in real time, and further the elevations of the target bottom section of the double-walled steel cofferdam without a bottom and each layout point of the current connecting high section obtained by measuring are subtracted from the known water surface elevation to obtain the lowering depths of the target bottom section of the double-walled steel cofferdam without a bottom and each layout point of the current connecting high section.

[0053] The construction process data include the tension of each cable, the pressure of each compartment, the positioning accuracy of each bottom key point and the lowering speed.

[0054] It needs to be further explained that the specific method of obtaining the cable tension of the target bottom section of the double-walled steel cofferdam without a bottom and the current connecting height section, the pressure of each compartment, the positioning accuracy of each bottom key point and the lowering speed is: using the tension sensor arranged on the cable to directly measure the cable tension of the target bottom section of the double-walled steel cofferdam without a bottom and the current connecting height section.

[0055] The pressure sensors arranged in each compartment are used to directly measure the pressure of each compartment of the target bottom section of the double-walled steel cofferdam without a bottom and the current high section.

[0056] A total station is placed on a stable control point near the target double-walled steel cofferdam without a bottom, and the key points at the bottom of the bottom section of the target double-walled steel cofferdam without a bottom and the current connecting height section are measured. The coordinates of the key points at the bottom are calculated by measuring the angles and distances between multiple control points and the key points at the bottom. The coordinates of the key points at the bottom are further subtracted from their design coordinates to obtain their absolute values, and the reciprocal is further taken. The results obtained are recorded as the positioning accuracy of the key points at the bottom section of the target double-walled steel cofferdam without a bottom and the current connecting height section.

[0057] The deployed speed sensors are used to directly measure the lowering speed of the target bottom section of the double-walled steel cofferdam without a bottom and the current connecting high section.

[0058] As a preferred feasibility example, the specific judgment method for the inclination warning demand and the inclination correction demand of the bottom section of the target double-walled steel cofferdam without a bottom is as follows: the inclination of each key point on the top of the bottom section of the target double-walled steel cofferdam without a bottom, the lowering depth of each layout point, the tension of each cable, the pressure of each compartment, the positioning accuracy of each bottom key point and the lowering speed are extracted from the lowering operation data, and the lowering inclination risk index and the lowering construction inclination risk index of the bottom section of the target double-walled steel cofferdam without a bottom are analyzed accordingly.

[0059] The lowering tilt risk index and the lowering construction tilt risk index of the bottom section of the target double-walled steel cofferdam without a bottom are summed according to the weights and multiplied with the potential influence of the environment in which the target double-walled steel cofferdam without a bottom is located, and the lowering tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom is calculated, and compared with the preset lowering tilt risk coefficient warning threshold and lowering tilt risk coefficient correction threshold. If the lowering tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom is greater than or equal to the lowering tilt risk coefficient warning threshold and less than the lowering tilt risk coefficient correction threshold, the tilt warning demand of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as a warning demand; if the lowering tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom is greater than or equal to the lowering tilt risk coefficient correction threshold, the tilt correction demand of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as a correction demand.

[0060] In a specific example, the weights corresponding to the lowering inclination risk index of the target bottom section of the double-walled steel cofferdam without a bottom and the lowering construction inclination risk index in the lowering inclination risk coefficient of the target bottom section of the double-walled steel cofferdam without a bottom can be set to 0.7 and 0.3 respectively.

[0061] (1) The structural characteristics, dimensions, weight distribution and interaction with the lowering environment of the bottom section of the target double-walled steel cofferdam without bottom play a fundamental role in determining the risk of tilting during the lowering process. Although the operation, equipment, process and other factors during the construction process will also affect the lowering tilt of the bottom section of the steel cofferdam, their influence is relatively small compared with the factors of the bottom section itself. (2) Many factors affecting the lowering tilt of the bottom section of the target double-walled steel cofferdam without bottom, such as structural form and dimensions, are basically determined during the design and manufacturing stages. In the actual lowering process, these factors are difficult to change and are relatively uncontrollable or difficult to control. Factors in the construction process are relatively easier to control and adjust through management, training and technical means. (3) The lowering tilt of the bottom section of the target double-walled steel cofferdam without bottom is directly related to the stability of the entire steel cofferdam and the safety of subsequent construction. Although construction factors are also important, they are more to ensure that the bottom section can be lowered smoothly according to design requirements and are the means and guarantee for achieving safe lowering of the bottom section. Therefore, in summary, the weights corresponding to the lowering tilt risk index of the bottom section of the target double-walled steel cofferdam without a bottom and the lowering construction tilt risk index in the lowering tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom are assigned as 0.7 and 0.3 respectively.

[0062] As a preferred feasibility example, the specific analysis method of the downward tilt risk index of the target bottom section of the double-walled steel cofferdam without a bottom is: compare the inclination of each key point on the top of the bottom section of the target double-walled steel cofferdam without a bottom with the set key point inclination threshold, and obtain the inclination scale value of each key point on the top of the bottom section of the target double-walled steel cofferdam without a bottom.

[0063] The lowering depth of each layout point of the bottom section of the target double-walled steel cofferdam without a bottom is calculated according to the standard deviation formula, and the standard deviation of the lowering depth of the layout point of the bottom section of the target double-walled steel cofferdam without a bottom is obtained.

[0064] The largest key point inclination scale value is selected from the inclination scale values ​​of each key point at the top of the bottom section of the target double-walled steel cofferdam without a bottom, and the value is added to the standard deviation of the lowering depth of the layout point. The result is recorded as the lowering inclination risk index of the bottom section of the target double-walled steel cofferdam without a bottom.

[0065] As a preferred feasibility example, the specific analysis method of the inclination risk index of the lowering construction of the bottom section of the target double-walled steel cofferdam without a bottom is: the cable tension, compartment pressure and lowering speed of the bottom section of the target double-walled steel cofferdam without a bottom are respectively compared with the cable tension reference values, compartment pressure reference values ​​and lowering speed reference values ​​stored in the database, and then the differences are subtracted from 1 to obtain the compliance degree of the cable tension, compartment pressure and lowering speed of the bottom section of the target double-walled steel cofferdam without a bottom.

[0066] It needs to be further explained that the specific method of obtaining the compliance of each cable tension of the bottom section of the target double-walled steel cofferdam without a bottom, the compliance of each compartment pressure and the compliance of the lowering speed is: compare the cable tension of each cable tension of the bottom section of the target double-walled steel cofferdam without a bottom with the corresponding cable tension reference value stored in the database, and obtain the ratio of each cable tension of the bottom section of the target double-walled steel cofferdam without a bottom to the corresponding cable tension reference value, further subtract it from 1, and the difference obtained is recorded as the compliance of each cable tension of the bottom section of the target double-walled steel cofferdam without a bottom.

[0067] Similarly, the compliance of pressure in each compartment and the compliance of lowering speed in the bottom section of the target double-walled steel cofferdam without bottom can be obtained.

[0068] It needs to be explained that the specific method of obtaining the corresponding cable tension reference values ​​stored in the database is: selecting from the database the cables whose numbers are consistent with the cables of the target bottom section of the double-walled steel cofferdam without a bottom, and recording them as the corresponding cables of the target bottom section of the double-walled steel cofferdam without a bottom, so that the cable tension reference values ​​in the database whose numbers are consistent with the cables of the target bottom section of the double-walled steel cofferdam without a bottom are the corresponding cable tension reference values ​​of the cable tension of the target bottom section of the double-walled steel cofferdam without a bottom.

[0069] Further, the inverse of the cable tension compliance and the compartment pressure compliance of the target bottom section of the double-walled steel cofferdam without a bottom are calculated and then accumulated and summed. Then, the results are added to the positioning accuracy of each bottom key point of the target bottom section of the double-walled steel cofferdam without a bottom and the compliance of the lowering speed of the target bottom section of the double-walled steel cofferdam without a bottom. The result is recorded as the inclination risk index of the lowering construction of the bottom section of the target double-walled steel cofferdam without a bottom.

[0070] The present invention obtains the lowering operation data of the target bottom section of the double-walled steel cofferdam without a bottom in real time, and judges the tilt warning demand and tilt correction demand of the bottom section of the target double-walled steel cofferdam without a bottom based on the data, and analyzes the cause of the tilt from multiple dimensions such as the tilt data of the bottom section of the target double-walled steel cofferdam without a bottom and the construction process data, so as to detect whether the bottom section of the steel cofferdam is abnormally tilted at the first time, and remind the construction personnel to take measures to avoid serious safety accidents such as structural damage or even collapse of the steel cofferdam due to excessive tilt.

[0071] The lowering operation data acquisition module is used to obtain the lowering operation data of the current connecting section of the target bottom-less double-walled steel cofferdam and the current inclination data of the bottom section of the target bottom-less double-walled steel cofferdam in real time.

[0072] In a specific example, the current inclination data of the bottom section of the target bottomless double-walled steel cofferdam includes the height difference and inclination of each compartment.

[0073] It needs to be further explained that the specific method of obtaining the height difference and inclination of each compartment of the bottom section of the target double-walled steel cofferdam without a bottom is: using the deployed inclination sensor to directly measure the inclination of each compartment of the bottom section of the target double-walled steel cofferdam without a bottom.

[0074] The water depth at the left and right ends of a compartment of the bottom section of the double-walled steel cofferdam without bottom cover is directly measured using the deployed depth gauge. , further according to the calculation formula The height difference of the compartment of the bottom section of the target double-walled steel cofferdam without bottom cover is obtained, where The inclination of the compartment at the bottom section of the double-walled steel cofferdam without bottom cover is is the length of the compartment of the target bottom section of the double-walled steel cofferdam without bottom extracted from the database. Similarly, the height difference of each compartment of the bottom section of the target double-walled steel cofferdam without bottom can be obtained.

[0075] The decentralized operation data analysis module is used to respectively determine the tilt warning demand and tilt correction demand of the current connecting high section of the target double-walled steel cofferdam without a bottom, as well as the tilt warning demand and tilt correction demand of the current decentralized bottom section of the target double-walled steel cofferdam without a bottom. If it is a warning demand or a correction demand, the tilt warning and correction module is executed; otherwise, the decentralized operation data collection module is executed.

[0076] As a preferred feasibility example, the specific judgment method for the inclination warning demand and inclination correction demand of the current connecting high section of the target double-walled steel cofferdam without a bottom is: the judgment method for the inclination warning demand and inclination correction demand of the bottom section of the target double-walled steel cofferdam without a bottom is used to obtain the inclination warning demand and inclination correction demand of the current connecting high section of the target double-walled steel cofferdam without a bottom.

[0077] As a preferred feasibility example, the specific judgment method for the tilt warning demand and tilt correction demand of the target bottom section of double-walled steel cofferdam without bottom is as follows: extract the height difference and inclination of each compartment of the bottom section of double-walled steel cofferdam without bottom from the current inclination data, and screen out the maximum height difference and maximum inclination of the compartments of the bottom section of double-walled steel cofferdam without bottom, respectively, compare them with the set height difference threshold and inclination threshold, add them up, and further multiply them with the potential influence of the environment in which the target double-walled steel cofferdam without bottom is located, and calculate the tilt risk coefficient of the bottom section of double-walled steel cofferdam without bottom.

[0078] The current tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom is compared with the preset tilt risk coefficient warning threshold and tilt risk coefficient correction threshold. If the current tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom is greater than or equal to the tilt risk coefficient warning threshold and less than the tilt risk coefficient correction threshold, the current tilt warning demand of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as a warning demand; if the current tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom is greater than or equal to the tilt risk coefficient correction threshold, the current tilt correction demand of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as a correction demand.

[0079] The tilt warning and correction module is used to provide tilt warning and tilt correction for the bottom section of the target double-walled steel cofferdam without a bottom cover and the current connecting height section.

[0080] As a preferred feasibility example, the tilt warning and correction module includes the following contents: extracting the tilt warning requirements and tilt correction requirements for the target bottom section of the double-walled steel cofferdam without a bottom and the current connecting height section; if it is a warning requirement or a correction requirement, further judging the reasons for the tilt of the target bottom section of the double-walled steel cofferdam without a bottom and the current connecting height section, providing feedback and warning, and based on them, performing tilt correction of the target bottom section of the double-walled steel cofferdam without a bottom and the current connecting height section.

[0081] It needs to be further explained that the specific judgment method for the reason for the inclination of the target bottom section of the double-walled steel cofferdam without a bottom and the current connecting section is: if the inclination scale value of a key point at the top of the bottom section of the target double-walled steel cofferdam without a bottom is greater than 1, or the standard deviation of the lowering depth of the layout point of the bottom section of the target double-walled steel cofferdam without a bottom is greater than the set standard deviation threshold, or there is a cable tension compliance in the bottom section of the target double-walled steel cofferdam without a bottom that is less than the set tension compliance threshold, then the reason for the inclination of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as uneven cable tension.

[0082] If there is a compartment pressure compliance degree in the bottom section of the target double-walled steel cofferdam without a bottom and the compliance degree of the compartment is less than the set pressure compliance degree threshold, the tilting cause of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as compartment pressure imbalance.

[0083] If the compliance degree of the lowering speed in the bottom section of the target double-walled steel cofferdam without a bottom is less than the set lowering speed compliance threshold, the reason for the inclination of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as non-compliance with the lowering speed.

[0084] If the positioning accuracy of a bottom key point in the bottom section of the target double-walled steel cofferdam without a bottom cover is less than the set key point positioning accuracy threshold, the cause of the tilt of the bottom section of the target double-walled steel cofferdam without a bottom cover is recorded as inaccurate bottom key point positioning.

[0085] It is necessary to further explain that the specific operations of the tilt correction of the bottom section of the target double-walled steel cofferdam without bottom cover and the current high section are as follows: (1) Based on cable tension adjustment: Use high-precision tension sensors to monitor the tension data of each cable in real time, accurately determine which cable tension is too large or too small, causing the bottom section of the steel cofferdam to tilt, and the tension of the cable on the opposite side of the tilt direction should be appropriately increased, and the tension of the cable on the same side should be appropriately reduced, and the cable tension is further slowly adjusted through equipment such as winches. (2) Based on compartment pressure balance: By installing pressure sensors in each compartment, the pressure value of each compartment is obtained in real time, and the pressure data of each compartment is compared to determine the relationship between the pressure difference and the tilt. For compartments with lower pressure, the pressure can be increased by injecting water, and for compartments with higher pressure, the pressure can be reduced by draining water. (3) Based on lowering speed control: Use high-precision lowering speed monitoring equipment to grasp the lowering speed of each part of the steel cofferdam bottom section in real time. If it is found that the lowering speed of one side of the steel cofferdam bottom section is too fast and causes tilting, the lowering speed of that side should be reduced, and the lowering speed of the other side should be appropriately increased. (4) Based on positioning system assistance: Use high-precision total stations, GPS positioning systems and other equipment to measure the position coordinates of each key point of the steel cofferdam bottom section in real time, accurately calculate the inclination and offset, and calculate the direction and specific value that need to be corrected based on the measured inclination data, combined with the design parameters and construction requirements of the steel cofferdam, and make corrections.

[0086] As a specific example, if the bottom section of the steel cofferdam is tilted 3° in a certain direction, it is determined according to relevant calculations that a certain force needs to be applied in the opposite direction or a certain amount of adjustment needs to be made to restore it to verticality.

[0087] As a preferred feasibility example, the tilt warning and correction module also includes: extracting the tilt warning demand and tilt correction demand currently released by the target bottom section of the double-walled steel cofferdam without a bottom, and if it is a warning demand or a correction demand, further judging whether the compartments of the bottom section of the target double-walled steel cofferdam without a bottom have height difference and tilt, and providing feedback and warning, and based on it, performing tilt correction of the bottom section of the target double-walled steel cofferdam without a bottom.

[0088] It needs to be further explained that the specific judgment method for whether the compartments of the bottom section of the target double-walled steel cofferdam without a bottom have height difference and inclination is: compare the height difference and inclination of each compartment of the bottom section of the target double-walled steel cofferdam without a bottom with the set allowable height difference and inclination thresholds respectively; if the height difference of a compartment of the bottom section of the target double-walled steel cofferdam without a bottom is greater than or equal to the allowable height difference, then the compartment of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as having a height difference; if the inclination of a compartment of the bottom section of the target double-walled steel cofferdam without a bottom is greater than or equal to the inclination threshold, then the compartment of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as having an inclination.

[0089] It is necessary to further explain that the specific operation of the tilt correction of the bottom section of the target double-walled steel cofferdam without a bottom is as follows: (1) On the outside or inside of the tilted side of the bottom section, according to the actual situation on site, a temporary support structure, such as a steel support or a concrete support, is installed. One end of the support is fixed on a stable foundation, and the other end is reliably connected to the bottom section. The bottom section is straightened through the reaction force provided by the support. (2) Appropriately add counterweights in the opposite direction of the tilt of the bottom section, such as placing sandbags, steel ingots and other heavy objects. The weight of the added counterweight is determined according to the tilt degree of the bottom section and the structural bearing capacity. Generally, it is appropriate not to exceed 5%-10% of the deadweight of the bottom section. By changing the center of gravity, the bottom section is assisted in correcting the deviation.

[0090] The database is used to store the length of each compartment of the bottom section of the target bottom-less double-walled steel cofferdam, and store the reference value of each cable tension, the reference value of each compartment pressure and the reference value of the lowering speed.

[0091] The present invention helps to grasp the overall inclination state of the steel cofferdam in real time, make timely warnings and corrections, and during the lowering process of the current connecting high section of the target double-walled steel cofferdam without a bottom, the current inclination state of the bottom section of the target double-walled steel cofferdam without a bottom can be determined in real time by respectively judging the inclination warning needs and inclination correction needs of the current connecting high section of the target double-walled steel cofferdam without a bottom and the inclination warning needs and inclination correction needs of the current lowering bottom section of the target double-walled steel cofferdam without a bottom, thereby avoiding damage to the steel cofferdam structure due to the inclination of the bottom section, ensuring the connection accuracy between the sections and the overall verticality, and improving the project quality.

[0092] Example 2

[0093] See also Figure 2 As shown, the present invention provides a method for warning and correcting the lowering inclination of a deepwater double-walled steel cofferdam without a bottom, and the specific steps are as follows: S1, environmental data acquisition: the deepwater double-walled steel cofferdam without a bottom to be monitored is recorded as a target double-walled steel cofferdam without a bottom, and the environmental data of the environment in which the target double-walled steel cofferdam without a bottom is obtained in real time, and the potential influence of the environment in which the target double-walled steel cofferdam without a bottom is evaluated.

[0094] S2. Analysis of bottom section lowering operation data: real-time acquisition of the lowering operation data of the target bottom section of the double-walled steel cofferdam without bottom cover, and based on this, determine the tilt warning demand and tilt correction demand of the bottom section of the target double-walled steel cofferdam without bottom cover; if it is a warning demand or a correction demand, execute S5; otherwise, execute S3.

[0095] S3. Collection of lowering operation data: real-time acquisition of lowering operation data of the current connecting high section of the target double-walled steel cofferdam without bottom and current inclination data of the bottom section of the target double-walled steel cofferdam without bottom.

[0096] S4. Analysis of the lowering operation data: respectively determine the tilt warning demand and tilt correction demand of the current connecting high section of the target double-walled steel cofferdam without a bottom, and the tilt warning demand and tilt correction demand of the current lowering bottom section of the target double-walled steel cofferdam without a bottom. If a warning demand or a correction demand is required, execute S5; otherwise, execute S3.

[0097] S5. Tilt warning and correction: Provide tilt warning and tilt correction for the bottom section of the target double-walled steel cofferdam without bottom cover and the current connecting height section.

[0098] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A deepwater bottomless double-walled steel cofferdam lowering tilt warning and correction system, characterized by: include: The environmental data acquisition module is used to record the deepwater double-walled steel cofferdam without bottom to be monitored as the target double-walled steel cofferdam without bottom, obtain the environmental data of the environment in which the target double-walled steel cofferdam without bottom is located in real time, and evaluate the potential influence of the environment in which the target double-walled steel cofferdam without bottom is located; The bottom section lowering operation data analysis module is used to obtain the lowering operation data of the target bottom section of the double-walled steel cofferdam without bottom cover in real time, and judge the tilt warning demand and tilt correction demand of the bottom section of the target double-walled steel cofferdam without bottom cover based on the data. If it is a warning demand or a correction demand, the tilt warning and correction module is executed, otherwise, the lowering operation data collection module is executed; The lowering operation data acquisition module is used to obtain the lowering operation data of the current connecting section of the target bottom-less double-walled steel cofferdam and the current inclination data of the bottom section of the target bottom-less double-walled steel cofferdam in real time; The decentralization operation data analysis module is used to respectively judge the tilt warning demand and tilt correction demand of the current high section of the target double-walled steel cofferdam without bottom cover and the tilt warning demand and tilt correction demand of the current lowered bottom section of the target double-walled steel cofferdam without bottom cover. If it is a warning demand or a correction demand, the tilt warning and correction module is executed; otherwise, the decentralization operation data collection module is executed; The tilt warning and correction module is used to provide tilt warning and tilt correction for the bottom section of the target double-walled steel cofferdam without bottom cover and the current connecting height section; The database is used to store the length of each compartment of the bottom section of the target double-walled steel cofferdam without a bottom, and store the reference value of the tension of each cable, the reference value of the pressure of each compartment and the reference value of the lowering speed.

2. According to claim 1, a deepwater bottomless double-walled steel cofferdam lowering tilt warning and correction system is characterized by: The specific analysis method of the potential influence of the environment of the target double-walled steel cofferdam without bottom cover is as follows: Extract the terrain flatness of the target double-walled steel cofferdam without bottom cover from the environmental data , water flow speed and water impact ; According to the analytical formula Get the potential influence of the environment where the target double-walled steel cofferdam is located ,in are the terrain flatness threshold, maximum water flow velocity and maximum water flow impact force of the environment where the target is located without affecting the lowering of the double-walled steel cofferdam without bottom cover. They are the minimum values ​​set to prevent the denominator from being 0, and their units are meters per second and Newton respectively.

3. According to claim 2, a deepwater bottomless double-walled steel cofferdam lowering tilt warning and correction system is characterized by: The specific judgment method of the tilt warning demand and tilt correction demand of the bottom section of the target double-walled steel cofferdam without bottom cover is as follows: The inclination of each key point on the top of the bottom section of the target double-walled steel cofferdam without bottom, the lowering depth of each layout point, the tension of each cable, the pressure of each compartment, the positioning accuracy of each key point on the bottom and the lowering speed are extracted from the lowering operation data, and the lowering inclination risk index of the bottom section of the target double-walled steel cofferdam without bottom and the lowering construction inclination risk index are analyzed accordingly; The lowering tilt risk index and the lowering construction tilt risk index of the bottom section of the target double-walled steel cofferdam without a bottom are summed according to the weights and multiplied with the potential influence of the environment in which the target double-walled steel cofferdam without a bottom is located, and the lowering tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom is calculated, and compared with the preset lowering tilt risk coefficient warning threshold and lowering tilt risk coefficient correction threshold. If the lowering tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom is greater than or equal to the lowering tilt risk coefficient warning threshold and less than the lowering tilt risk coefficient correction threshold, the tilt warning demand of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as a warning demand; if the lowering tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom is greater than or equal to the lowering tilt risk coefficient correction threshold, the tilt correction demand of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as a correction demand.

4. According to claim 3, a deepwater bottomless double-walled steel cofferdam lowering tilt warning and correction system is characterized by: The specific analysis method of the lowering and tilting risk index of the bottom section of the target double-walled steel cofferdam without bottom cover is as follows: The inclination of each key point on the top of the bottom section of the target double-walled steel cofferdam without bottom cover is compared with the set key point inclination threshold, so as to obtain the inclination scale value of each key point on the top of the bottom section of the target double-walled steel cofferdam without bottom cover; The lowering depth of each layout point of the bottom section of the target double-walled steel cofferdam without bottom is calculated according to the standard deviation formula to obtain the standard deviation of the lowering depth of the layout point of the bottom section of the target double-walled steel cofferdam without bottom; The largest key point inclination scale value is selected from the inclination scale values ​​of each key point at the top of the bottom section of the target double-walled steel cofferdam without a bottom, and the value is added to the standard deviation of the lowering depth of the layout point. The result is recorded as the lowering inclination risk index of the bottom section of the target double-walled steel cofferdam without a bottom.

5. According to claim 3, a deepwater bottomless double-walled steel cofferdam lowering tilt warning and correction system is characterized by: The specific analysis method of the tilt risk index of the lowering construction of the bottom section of the target double-walled steel cofferdam without bottom cover is as follows: The cable tension, compartment pressure and lowering speed of the bottom section of the target double-walled steel cofferdam without bottom cover are respectively compared with the reference values ​​of cable tension, compartment pressure and lowering speed stored in the database, and then the difference is made with 1 to obtain the compliance of the cable tension, compartment pressure and lowering speed of the bottom section of the target double-walled steel cofferdam without bottom cover; The inverse of the cable tension compliance and the compartment pressure compliance of the target bottom section of the double-walled steel cofferdam without a bottom are calculated and then added together. The results are then added to the positioning accuracy of each bottom key point of the target bottom section of the double-walled steel cofferdam without a bottom and the compliance of the lowering speed of the target bottom section of the double-walled steel cofferdam without a bottom. The result is recorded as the inclination risk index of the lowering construction of the bottom section of the target double-walled steel cofferdam without a bottom.

6. The system for early warning and correcting the tilt of a deepwater bottomless double-walled steel cofferdam according to claim 3 is characterized by: The specific judgment method of the tilt warning demand and tilt correction demand of the current high-rise section of the target bottom-free double-wall steel cofferdam is as follows: The tilt warning demand and tilt correction demand of the bottom section of the target double-walled steel cofferdam without bottom are determined by the same method, and the tilt warning demand and tilt correction demand of the current high section of the target double-walled steel cofferdam without bottom are obtained.

7. The system for early warning and correcting the tilt of a deepwater bottomless double-walled steel cofferdam according to claim 6 is characterized by: The specific judgment method of the tilt warning demand and tilt correction demand of the bottom section of the target double-walled steel cofferdam without bottom cover is as follows: Extract the height difference and inclination of each compartment of the bottom section of the target double-walled steel cofferdam without bottom from the current inclination data, and screen out the maximum height difference and maximum inclination of the compartment of the bottom section of the target double-walled steel cofferdam without bottom, respectively, compare them with the set height difference threshold and inclination threshold, add them up, and multiply them with the potential influence of the environment where the target double-walled steel cofferdam without bottom is located, and calculate the inclination risk coefficient of the current lowering of the bottom section of the target double-walled steel cofferdam without bottom; The current tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom is compared with the preset tilt risk coefficient warning threshold and tilt risk coefficient correction threshold. If the current tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom is greater than or equal to the tilt risk coefficient warning threshold and less than the tilt risk coefficient correction threshold, the current tilt warning demand of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as a warning demand; if the current tilt risk coefficient of the bottom section of the target double-walled steel cofferdam without a bottom is greater than or equal to the tilt risk coefficient correction threshold, the current tilt correction demand of the bottom section of the target double-walled steel cofferdam without a bottom is recorded as a correction demand.

8. The system for early warning and correcting the tilt of a deepwater bottomless double-walled steel cofferdam according to claim 7 is characterized by: The tilt warning and correction module includes: The tilt warning and correction requirements for the target bottom section of the double-walled steel cofferdam without a bottom and the current connecting height section are extracted. If a warning requirement or a correction requirement is required, the reasons for the tilt of the bottom section of the target double-walled steel cofferdam without a bottom and the current connecting height section are determined, and feedback and warning are given, and based on them, the tilt correction of the bottom section of the target double-walled steel cofferdam without a bottom and the current connecting height section is performed.

9. The system for early warning and correcting the tilt of a deepwater bottomless double-walled steel cofferdam according to claim 8 is characterized by: The tilt warning and correction module also includes: The tilt warning demand and tilt correction demand currently released by the target bottom section of the double-walled steel cofferdam without a bottom are extracted. If it is a warning demand or a correction demand, it is determined whether the compartments of the bottom section of the target double-walled steel cofferdam without a bottom have height difference and tilt, and feedback and warning are given, and the tilt correction of the bottom section of the target double-walled steel cofferdam without a bottom is performed based on it.

10. A method for early warning and correction of the lowering tilt of a deepwater bottomless double-walled steel cofferdam, characterized in that: include: S1. Environmental data collection: The deepwater double-walled steel cofferdam without bottom to be monitored is recorded as the target double-walled steel cofferdam without bottom, and the environmental data of the environment in which the target double-walled steel cofferdam without bottom is obtained in real time, and the potential influence of the environment in which the target double-walled steel cofferdam without bottom is evaluated; S2, bottom section lowering operation data analysis: real-time acquisition of the lowering operation data of the target bottom section of the double-walled steel cofferdam without bottom cover, and based on the data, the tilt warning demand and tilt correction demand of the bottom section of the target double-walled steel cofferdam without bottom cover are judged. If the warning demand or the correction demand is required, S5 is executed, otherwise, S3 is executed; S3, data collection for lowering operation: real-time acquisition of lowering operation data of the current connecting high section of the target double-walled steel cofferdam without bottom cover and current inclination data of the bottom section of the target double-walled steel cofferdam without bottom cover; S4, analysis of lowering operation data: respectively determine the tilt warning demand and tilt correction demand of the current connecting high section of the target double-walled steel cofferdam without bottom cover and the tilt warning demand and tilt correction demand of the current lowering bottom section of the target double-walled steel cofferdam without bottom cover. If the warning demand or the correction demand is required, execute S5; otherwise, execute S3; S5. Tilt warning and correction: Provide tilt warning and tilt correction for the bottom section of the target double-walled steel cofferdam without bottom cover and the current connecting height section.

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