Dynamic and stable construction method and system for hydraulic reclamation pipe bag cofferdam based on strong tide condition

Abstract

The invention discloses a dynamic stable construction method and system for a hydraulic reclamation pipe bag cofferdam based on a strong tide condition, and belongs to the technical field of cofferdam construction. The method specifically comprises the following steps: S1, environment data acquisition and preprocessing: acquiring related data of a construction area through deployment of a multi-source sensor, and preprocessing the acquired data; and S2, construction preparation and construction operation are conducted, wherein relevant parameters of the hydraulic reclamation pipe bag cofferdam are determined according to the collected relevant data, and construction of the hydraulic reclamation pipe bag cofferdam is conducted according to the determined parameters. Key data such as tidal range, flow velocity, circumferential stress, dry density and settlement volume are collected in real time through a multi-source sensor, and comprehensive dynamic monitoring of the construction process is achieved in combination with a construction evaluation index model. The system generates decision suggestions according to real-time data, the construction response speed and accuracy are remarkably improved, structural risks caused by delayed feedback in a traditional method are avoided, a grading evaluation mechanism is introduced, and differentiated measures are taken for different grades.

Description

Technical Field

[0001] The present invention relates to the technical field of cofferdam construction, and in particular to a dynamic stabilization construction method and system for a blow-fill bag cofferdam under strong tide conditions. Background Art

[0002] Traditional cofferdam construction methods usually use materials such as sand, gravel, and soil for filling. These materials have poor anti-seepage properties and are prone to problems such as leakage and collapse. In addition, traditional cofferdam construction methods also have shortcomings in stability and are easily affected by natural factors such as water erosion and earthquakes. At the same time, traditional cofferdam construction methods have poor traffic capacity and are difficult to meet the needs of modern engineering construction.

[0003] The blown-fill bag cofferdam uses geotextile bags as containers. Sand, mud and other filling materials are extracted from the excavation area and transported to the bags through mud pumps and other equipment. The filling materials gradually settle and drain in the bags. Water seeps out through the pores of the geotextile, while sand and other particles are retained to form a cofferdam structure with certain strength and stability. The construction process of the blown-fill bag cofferdam is relatively simple, and large-scale cofferdam filling can be completed in a short time, greatly shortening the construction period. The geotextile bag has good permeability and filterability. After the filling material settles and solidifies in the bag, it can form a relatively dense structure, effectively preventing water infiltration.

[0004] However, under strong tide conditions, during the construction of the blown-fill bag cofferdam, there is a lack of real-time monitoring and analysis of the construction process, and the construction plan is adjusted according to the analysis results to achieve dynamic and stable construction, which reduces the actual use effect of the blown-fill bag cofferdam after construction. Summary of the Invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a dynamic and stable construction method and system for a blown-fill bag cofferdam based on strong tide conditions; it can solve the problem that during the construction of existing blown-fill bag cofferdams, there is a lack of real-time monitoring and analysis of the construction process, and the construction plan is adjusted according to the analysis results to achieve dynamic and stable construction, thereby reducing the actual use effect of the blown-fill bag cofferdam after construction.

[0006] Technical solution: To solve the above technical problems, according to one aspect of the present invention, more specifically, a dynamic stabilization construction method of a blow-fill bag-fill cofferdam based on strong tide conditions, specifically comprising the following steps:

[0007] S1. Environmental data collection and preprocessing: Collect relevant data of the construction area through the deployment of multi-source sensors and preprocess the collected data;

[0008] S2. Construction preparation and construction operation: Determine the relevant parameters of the blown-fill bag cofferdam based on the collected relevant data, and carry out the construction of the blown-fill bag cofferdam according to the determined parameters;

[0009] S3. Real-time data collection and analysis of cofferdams: During the construction process, relevant data of the bag-fill cofferdams are collected. The construction evaluation index is obtained by analyzing the collected data on the maximum hoop stress of the bags, the measured dry density of the filling sand, and the settlement at the monitoring points.

[0010] S4. Comparison of analysis results: comparing the construction evaluation index with a pre-set first threshold value of the construction evaluation index and a pre-set second threshold value of the construction evaluation index to generate a corresponding comparison result;

[0011] S5. Comparison result display and decision generation: Display the comparison results, generate corresponding decisions based on the comparison results, and display the decisions.

[0012] Furthermore, in step S1, the specific method for collecting relevant data of the construction area is: obtaining the tidal range, maximum flow velocity, and wave period of the construction area through historical data and short-term observations; determining the soil layer distribution by rotating hole sampling, and measuring the shear strength of the soil.

[0013] Furthermore, in step S2, the specific steps of the blow-fill bag cofferdam construction are as follows:

[0014] S21. Clear debris, obstacles, and silt in the construction area and lay soft concrete paving;

[0015] S22. Lay the tube bags flatly and tightly at the cofferdam location according to the design requirements;

[0016] S23, filling the sand into the tube bag to ensure that the sand is evenly distributed in the tube bag;

[0017] S24. After the filling is completed, the cofferdam is shaped to make the tube bag meet the design shape and size requirements.

[0018] Furthermore, in step S3, when collecting relevant data on the blown-fill bag cofferdam, fiber grating sensors are deployed at key nodes of the bag, with an interval of 2 meters, to collect hoop stress in real time; a dual-probe gamma-ray densitometer is vertically inserted into the filling sand body to measure the dry density; a high-precision static level with an accuracy of ±0.1mm and a GNSS settlement plate with a sampling frequency of 1Hz collect the cofferdam settlement, and three reference points are set in the stable area to adopt a closed leveling route to eliminate system errors.

[0019] Furthermore, in step S3, the construction evaluation index is obtained by analyzing the collected maximum hoop stress of the tube bag, the measured dry density of the filling sand body, and the settlement at the monitoring point:

[0020]

[0021] Among them, PG is the construction evaluation index, ZY is the maximum hoop stress of the tube bag, YY is the allowable tensile stress of the tube bag, CM is the measured dry density of the filling sand body, XM is the minimum dry density allowed by the design, DM is the theoretical maximum dry density, DC is the maximum differential settlement of adjacent monitoring points, XC is the minimum differential settlement of adjacent monitoring points, and C i is the settlement of each monitoring point, and n is the number of monitoring points.

[0022] Furthermore, in step S4, when PG≥the first threshold of the construction evaluation index, it is judged as an excellent level; when the second threshold of the construction evaluation index≤PG<the first threshold of the construction evaluation index, it is judged as a qualified level; when PG<the second threshold of the construction evaluation index, it is judged as a risk level.

[0023] Furthermore, in step S4, the first threshold value of the construction evaluation index is greater than the second threshold value of the construction evaluation index, and the first threshold value of the construction evaluation index and the second threshold value of the construction evaluation index are set according to the actual situation of the construction site.

[0024] Furthermore, in S5, when PG ≥ the first threshold value of the construction assessment index and is judged to be excellent, the construction is carried out normally and the filling rate can be increased to 110% of the design value; when the second threshold value of the construction assessment index ≤ PG < the first threshold value of the construction assessment index and is judged to be qualified, the filling rate is reduced to 80% and the curing time of each layer is extended to 3 hours; when PG < the second threshold value of the construction assessment index and is judged to be a risk level, the construction is stopped immediately, the pipe bag pressure relief valve is started to release the excess pore water pressure, the ROV is dispatched to check the damage of the pipe bag, and quick-setting slurry is injected according to the defect location. Work can only be resumed when PG is restored to above 0.75.

[0025] According to another aspect of the present invention, a system for dynamically stabilizing a blown-fill bag-type cofferdam under strong tide conditions is provided. The system is used to implement the above-mentioned method for dynamically stabilizing a blown-fill bag-type cofferdam under strong tide conditions, and includes: a data acquisition and preprocessing module, a data storage module, a threshold setting module, an analysis and processing module, and a display and interaction module;

[0026] Data collection and preprocessing module: used to collect relevant data of the construction area, preprocess the collected data, collect relevant data of the blow-fill bag cofferdam during the construction process, and transmit the data to the data storage module and analysis and processing module;

[0027] Data storage module: used to store the data collected and preprocessed by the data acquisition and preprocessing module, and transmit the data to the analysis and processing module;

[0028] Threshold setting module: used to set the first threshold value and the second threshold value of the construction evaluation index according to the actual situation of the construction site, and transmit the setting results to the analysis and processing module;

[0029] Analysis and processing module: used to obtain a construction evaluation index by analyzing the collected data of the maximum hoop stress of the tube bag, the measured dry density of the filling sand body, and the settlement of the monitoring point, compare the construction evaluation index with the pre-set first and second thresholds of the construction evaluation index, generate corresponding comparison results, and transmit the comparison results to the display and interaction module;

[0030] Display interaction module: used to display the comparison results, generate corresponding decisions based on the comparison results, and display the decisions.

[0031] Beneficial effects: Through real-time collection of key data such as tidal range, flow velocity, hoop stress, dry density and settlement by multi-source sensors, combined with the construction evaluation index model, all-round dynamic monitoring of the construction process can be achieved. The system generates decision recommendations based on real-time data, significantly improving construction response speed and accuracy, avoiding structural risks caused by delayed feedback in traditional methods. A graded assessment mechanism is introduced, with differentiated measures taken for different levels, effectively balancing efficiency and safety. Risks of cofferdam collapse and leakage, particularly under strong tides, are significantly reduced. Construction parameters are dynamically adjusted based on real-time data to reduce ineffective downtime. Advanced equipment such as fiber Bragg grating sensors, dual-probe gamma-ray densitometers, high-precision static levels, and GNSS settlement plates are used, combined with closed leveling routes to eliminate system errors, ensure data acquisition accuracy, and provide a reliable basis for scientific decision-making. A construction assessment index model is constructed by integrating hoop stress, dry density, and differential settlement to quantitatively assess construction quality, breaking through the limitations of traditional reliance on empirical judgment and improving the objectivity and consistency of assessments. Through the coordinated operation of data acquisition, storage, analysis, threshold setting, and interactive display modules, the system achieves automated management of the entire construction process, reducing human intervention, minimizing the risk of operational errors, and improving project management efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the method flow chart;

[0033] Figure 2 It is a schematic diagram of the system principle. DETAILED DESCRIPTION

[0034] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] In the first step, the data acquisition and preprocessing module collects relevant data of the construction area through the deployment of multi-source sensors and preprocesses the collected data. The specific methods for collecting relevant data of the construction area are: obtaining the tidal range, maximum flow velocity, and wave period of the construction area through historical data and short-term observations; taking rotational hole samples to determine the soil layer distribution and measure the shear strength of the soil.

[0037] The second step is to determine the relevant parameters of the blown-fill bag cofferdam based on the collected relevant data, and to construct the blown-fill bag cofferdam based on the determined parameters. The specific steps for the construction of the blown-fill bag cofferdam are as follows:

[0038] S21. Clear debris, obstacles, and silt in the construction area and lay soft concrete paving;

[0039] S22. Lay the tube bags flatly and tightly at the cofferdam location according to the design requirements;

[0040] S23, filling the sand into the tube bag to ensure that the sand is evenly distributed in the tube bag;

[0041] S24. After the filling is completed, the cofferdam is shaped to make the tube bag meet the design shape and size requirements.

[0042] In the third step, during the construction process, relevant data of the blown-fill bag cofferdam are collected through the data acquisition and preprocessing module. When collecting relevant data of the blown-fill bag cofferdam, fiber optic Bragg grating sensors are deployed at key nodes of the bag, with an interval of 2 meters, to collect hoop stress in real time; a dual-probe gamma-ray densitometer is vertically inserted into the filling sand body to measure the dry density; a high-precision static level with an accuracy of ±0.1mm and a GNSS settlement plate with a sampling frequency of 1Hz are used to collect the cofferdam settlement, and three benchmark points are set in the stable area to adopt a closed leveling route to eliminate system errors.

[0043] The construction evaluation index is obtained by analyzing the collected data of the maximum hoop stress of the tube bag, the measured dry density of the filling sand body and the settlement of the monitoring point through the analysis and processing module:

[0044]

[0045] Among them, PG is the construction evaluation index, ZY is the maximum hoop stress of the tube bag, YY is the allowable tensile stress of the tube bag, CM is the measured dry density of the filling sand body, XM is the minimum dry density allowed by the design, DM is the theoretical maximum dry density, DC is the maximum differential settlement of adjacent monitoring points, XC is the minimum differential settlement of adjacent monitoring points, and C i is the settlement of each monitoring point, and n is the number of monitoring points.

[0046] The fourth step is to compare the construction evaluation index with the pre-set first threshold value of the construction evaluation index and the second threshold value of the construction evaluation index through the analysis and processing module to generate corresponding comparison results. When PG ≥ the first threshold value of the construction evaluation index, it is judged as excellent; when the second threshold value of the construction evaluation index ≤ PG < the first threshold value of the construction evaluation index, it is judged as qualified; when PG < the second threshold value of the construction evaluation index, it is judged as risky. The first threshold value of the construction evaluation index is greater than the second threshold value of the construction evaluation index. The first threshold value of the construction evaluation index and the second threshold value of the construction evaluation index are set according to the actual situation of the construction site.

[0047] The fifth step is to display the comparison results in the interactive module, generate corresponding decisions based on the comparison results, and display the decisions. When PG ≥ the first threshold of the construction assessment index and is judged to be excellent, construction will proceed normally and the filling rate can be increased to 110% of the design value; when the second threshold of the construction assessment index ≤ PG < the first threshold of the construction assessment index and is judged to be qualified, the filling rate will be reduced to 80% and the curing time of each layer will be extended to 3 hours; when PG < the second threshold of the construction assessment index and is judged to be a risk level, construction will be stopped immediately, the pipe bag pressure relief valve will be started to release the excess pore water pressure, an ROV will be dispatched to check the damage of the pipe bag, and quick-setting slurry will be injected according to the defect location. Work can only resume when PG recovers to above 0.75.

[0048] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A dynamic stabilization construction method for blow-fill bag cofferdams based on strong tide conditions, characterized in that: The specific steps include: S1. Environmental data collection and preprocessing: Collect relevant data of the construction area through the deployment of multi-source sensors and preprocess the collected data; S2. Construction preparation and construction operation: Determine the relevant parameters of the blown-fill bag cofferdam based on the collected relevant data, and carry out the construction of the blown-fill bag cofferdam according to the determined parameters; S3. Real-time data collection and analysis of cofferdams: During the construction process, relevant data of the bag-fill cofferdams are collected. The construction evaluation index is obtained by analyzing the collected data on the maximum hoop stress of the bags, the measured dry density of the filling sand, and the settlement at the monitoring points. S4. Comparison of analysis results: comparing the construction evaluation index with a pre-set first threshold value of the construction evaluation index and a pre-set second threshold value of the construction evaluation index to generate a corresponding comparison result; S5. Comparison result display and decision generation: Display the comparison results, generate corresponding decisions based on the comparison results, and display the decisions.

2. The dynamic stabilization construction method of a bag-filled tube cofferdam under strong tide conditions according to claim 1 is characterized by: In step S1, the specific method for collecting relevant data of the construction area is: obtaining the tidal range, maximum flow velocity, and wave period of the construction area through historical data and short-term observations; taking rotational hole samples to determine the soil layer distribution and measure the shear strength of the soil.

3. The dynamic stabilization construction method of a bag-filled tube cofferdam under strong tide conditions according to claim 1 is characterized by: In step S2, the specific steps of the blow-fill bag-in-tube cofferdam construction are as follows: S21. Clear debris, obstacles, and silt in the construction area and lay soft concrete paving; S22. Lay the tube bags flatly and tightly at the cofferdam location according to the design requirements; S23, filling the sand into the tube bag to ensure that the sand is evenly distributed in the tube bag; S24. After the filling is completed, the cofferdam is shaped to make the tube bag meet the design shape and size requirements.

4. The dynamic stabilization construction method of a bag-filled pipe cofferdam under strong tide conditions according to claim 1 is characterized in that: In step S3, when collecting data related to the blown-fill bag cofferdam, fiber Bragg grating sensors are deployed at key nodes of the bag, with an interval of 2 meters, to collect hoop stress in real time; a dual-probe gamma-ray densitometer is vertically inserted into the filling sand body to measure the dry density; a high-precision static level with an accuracy of ±0.1mm and a GNSS settlement plate with a sampling frequency of 1Hz are used to collect cofferdam settlement, and three reference points are set in the stable area to adopt a closed leveling route to eliminate system errors.

5. The dynamic stabilization construction method of a bag-filled blown-fill cofferdam under strong tide conditions according to claim 1 is characterized in that: In step S3, the construction evaluation index is obtained by analyzing the collected maximum hoop stress of the tube bag, the measured dry density of the filling sand body, and the settlement at the monitoring point: Among them, PG is the construction evaluation index, ZY is the maximum hoop stress of the tube bag, YY is the allowable tensile stress of the tube bag, CM is the measured dry density of the filling sand body, XM is the minimum dry density allowed by the design, DM is the theoretical maximum dry density, DC is the maximum differential settlement of adjacent monitoring points, XC is the minimum differential settlement of adjacent monitoring points, and C i is the settlement of each monitoring point, and n is the number of monitoring points.

6. The dynamic stabilization construction method of a bag-filled blown-fill cofferdam under strong tide conditions according to claim 5 is characterized by: In step S4, when PG≥the first threshold of the construction evaluation index, it is judged as an excellent level; when the second threshold of the construction evaluation index≤PG<the first threshold of the construction evaluation index, it is judged as a qualified level; when PG<the second threshold of the construction evaluation index, it is judged as a risk level.

7. The dynamic stabilization construction method of a bag-filled blown-fill cofferdam under strong tide conditions according to claim 1 is characterized by: In step S4, the first threshold value of the construction evaluation index is greater than the second threshold value of the construction evaluation index. The first threshold value of the construction evaluation index and the second threshold value of the construction evaluation index are set according to the actual situation of the construction site.

8. The dynamic stabilization construction method of a bag-filled blown-fill cofferdam under strong tide conditions according to claim 6 is characterized in that: In S5, when PG ≥ the first threshold value of the construction assessment index and is judged to be excellent, construction is carried out normally and the filling rate can be increased to 110% of the design value; when the second threshold value of the construction assessment index ≤ PG < the first threshold value of the construction assessment index and is judged to be qualified, the filling rate is reduced to 80% and the curing time of each layer is extended to 3 hours; when PG < the second threshold value of the construction assessment index and is judged to be a risk level, construction is stopped immediately, the pipe bag pressure relief valve is started to release the excess pore water pressure, an ROV is dispatched to inspect the damage of the pipe bag, and quick-setting slurry is injected according to the defect location. Work can only be resumed when PG is restored to above 0.

75.

9. Dynamic stabilization construction system of bag-filled cofferdam under strong tide conditions, characterized by: The system is used to implement the dynamic stabilization construction method of the blow-fill bag cofferdam under strong tide conditions as described in any one of claims 1 to 8, comprising: a data acquisition and preprocessing module, a data storage module, a threshold setting module, an analysis and processing module, and a display and interaction module; Data collection and preprocessing module: used to collect relevant data of the construction area, preprocess the collected data, collect relevant data of the blow-fill bag cofferdam during the construction process, and transmit the data to the data storage module and analysis and processing module; Data storage module: used to store the data collected and preprocessed by the data acquisition and preprocessing module, and transmit the data to the analysis and processing module; Threshold setting module: used to set the first threshold value and the second threshold value of the construction evaluation index according to the actual situation of the construction site, and transmit the setting results to the analysis and processing module; Analysis and processing module: used to obtain a construction evaluation index by analyzing the collected data of the maximum hoop stress of the tube bag, the measured dry density of the filling sand body, and the settlement of the monitoring point, compare the construction evaluation index with the pre-set first and second thresholds of the construction evaluation index, generate corresponding comparison results, and transmit the comparison results to the display and interaction module; Display interaction module: used to display the comparison results, generate corresponding decisions based on the comparison results, and display the decisions.

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