Immersed tube joint floating-state barge construction control method

Abstract

The invention relates to an immersed tube joint floating-state barge construction control method, which can realize safe and rapid barge of immersed tube joints by establishing a multi-parameter system comprising monitoring parameters, control parameters and regulation and control parameters. The maximum oil pressure difference value of three areas of transportation equipment is adjusted and controlled through the oil pressure of the transportation equipment, and it is guaranteed that immersed tube joints do not crack in the barge-up process; the height of a buttress on a ship is adjusted based on numerical calculation before loading, the deflection of a semi-submersible barge is controlled based on load adjustment of the semi-submersible barge in the pier falling process, and it is guaranteed that immersed tube joints do not crack in the pier falling process; a load adjusting scheme is formulated according to the loading speed and the tide level change before loading implementation, the height difference between a wharf surface and a stern deck surface and the floating state of the semi-submersible barge are controlled to meet corresponding control indexes based on loading speed adjustment and semi-submersible barge load adjustment in the loading process, and smooth walking of transportation equipment and stability and safety of the semi-submersible barge in the loading process are guaranteed; and the immersed tube joint can be safely connected.

Description

Technical Field

[0001] The invention relates to the technical field of barge-up of a submerged tube segment, and in particular to a construction control method for floating barge-up of a submerged tube segment. Background Art

[0002] At present, the transportation of immersed tube tunnel segments mainly adopts the floating transportation technology of tugboat towing, which has the disadvantages of occupying a large number of tugboats and a long time, occupying a large area of ​​waters, slow towing speed, great impact on navigation, deep waterway, great risk of coordination and linkage in the towing process, and poor ability to resist wind and waves. With the rapid development of cross-sea immersed tube tunnels and semi-submersible barge transportation technology, and the development trend of factory prefabrication of immersed tube segments, the use of semi-submersible barges to transport immersed tube segments has broad prospects. The transportation of immersed tube segments by semi-submersible barges includes the processes of barge-up, transshipment and diving of immersed tube segments. Barge-up of immersed tube segments refers to transporting the immersed tube from the dock to the plywood surface of the semi-submersible barge by transportation equipment, so that the immersed tube segment falls on the ship's pier on the deck of the semi-submersible barge.

[0003] Large immersed tube segments, especially reinforced concrete segments, have poor deformation adaptability. Due to the difference in stiffness between semi-submersible barges and immersed tube segments, the deformation and posture of the semi-submersible barge are in dynamic change during the process of the immersed tube segment being put on the pier, which in turn affects the stress and deformation of the immersed tube segment, and easily causes the immersed tube segment to crack. The traditional construction control method in the existing engineering field is mainly reflected in the control of the safety of the immersed tube segment structure itself, and there is no control over the dynamic process of the immersed tube segment being put on the pier. In addition, during the process of being put on the pier, transportation equipment such as transport trolleys are used to transport the immersed tube segment from the dock to the semi-submersible barge. When the immersed tube segment crosses the boundary line between the dock and the semi-submersible barge, the immersed tube segment and the dock are not on the same plane, resulting in the inability of the transportation equipment to move smoothly; and during the process of being put on the pier and landing, the tilt of the semi-submersible barge may cause the semi-submersible barge to overturn, which poses a stability safety problem. Summary of the invention

[0004] The purpose of the present invention is to provide a construction control method for floating barge-up of immersed tube segments in view of the problems in the prior art of floating barge-up of immersed tube segments, such as the possibility that the transport equipment may not be able to move, stability and safety problems, and cracking of the immersed tube segments.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for controlling floating barge-up of a submerged tube segment comprises the following steps:

[0007] S1. Design of multi-parameter system for construction control; the multi-parameter system includes: feedback of real-time status of control parameters and regulation parameters through monitoring parameters, control of control parameters through real-time regulation of regulation parameters, and control objectives through control of control parameters;

[0008] Among them, the control objectives include the smooth movement of the transport equipment during the process of loading and unloading, the stability and safety of the semi-submerged barge, and the non-cracking of the immersed tube sections;

[0009] The control parameters include wind speed and wave height, tide level change speed, height difference between the dock surface and the stern deck surface, floating state of the semi-submersible barge, deflection of the semi-submersible barge deck surface, and maximum difference in oil pressure in the three areas of the transport equipment;

[0010] Monitoring parameters include wind and wave monitoring, tide level monitoring, dock elevation monitoring, stern deck elevation monitoring, semi-submersible barge four-corner draft monitoring, semi-submersible barge deflection monitoring, transport equipment oil pressure monitoring, immersed tube section front end coordinate monitoring, and semi-submersible barge cabin water level monitoring;

[0011] The control parameters include the speed of loading, the load adjustment of the semi-submersible barge and the height of the pier on board;

[0012] S2. Construction preparation before loading based on multi-parameter system, including the following steps:

[0013] (1) Establish control indicators for control parameters:

[0014] According to the analysis of the response of wind and waves to the motion of the semi-submersible barge under the moored state, the control indicators of wind speed and wave height are set;

[0015] According to the analysis of the semi-submersible barge's load-adjusting capacity, set the control index of the tide level change speed;

[0016] According to the analysis of the transport equipment's traveling capacity, set the control index of the height difference between the dock surface and the stern deck surface;

[0017] According to the safety analysis of the transport equipment's traveling ability and the semi-submersible barge's stability, set the control index of the semi-submersible barge's floating state;

[0018] According to the stress analysis of the immersed tube segment, the control indicators of the deck deflection of the semi-submersible barge and the maximum difference of the oil pressure in the three zones of the transport equipment are set;

[0019] (2) Advance control before the launch:

[0020] Wind speed, wind direction and wave height are fed back through wind and wave monitoring. If the wind speed and wave height exceed the control index, the barge construction will not be carried out;

[0021] Tidal level monitoring reflects the speed of tidal level changes, and determines whether to carry out barge construction based on the speed of tidal level changes. If the speed of tidal level changes exceeds the control index and the semi-submersible barge's load-adjusting capacity cannot cope with the rapid tidal level changes, barge construction will not be carried out; the barge speed is set according to the traveling capacity of the transport equipment, and a semi-submersible barge load-adjusting plan for barge construction is formulated based on the barge speed and the speed of tidal level changes;

[0022] Numerical calculation is used to analyze the construction conditions of the immersed tube segment dropping on the pier. The height of the pier on the ship is adjusted according to the calculation results, so that the bottom surface of the immersed tube segment is in a horizontal state after the pier is dropped. S3, start the barge construction, implement it according to the set barge speed and load adjustment plan, from the dock to the semi-submersible barge, drive the immersed tube segment to the barge through the transportation equipment, and then carry out real-time regulation according to the monitoring data until the immersed tube segment drops on the pier to the pier on the ship on the semi-submersible barge;

[0023] During the loading process, when the real-time data of the corresponding control parameters do not meet the corresponding control indicators:

[0024] By controlling the loading speed and the semi-submersible barge load adjustment, the height difference between the dock surface and the semi-submersible barge stern deck surface is controlled, and the buoyancy of the semi-submersible barge is controlled by semi-submersible barge load adjustment, so as to meet the corresponding control indicators and ensure the smooth operation of the transportation equipment;

[0025] During the process of loading and unloading, when the real-time data of the corresponding control parameters do not meet the corresponding control indicators:

[0026] The buoyancy of the semi-submersible barge is controlled by adjusting the load of the semi-submersible barge so as to meet the corresponding control indicators and ensure the stability and safety of the semi-submersible barge during the process of landing and landing;

[0027] And / or by adjusting the oil pressure of the transport equipment to control the maximum difference of the oil pressure in the three zones of the transport equipment so as to meet the corresponding control index to ensure that the submerged tube section does not crack during the barge loading process;

[0028] During the pier dropping process, when the real-time data of the corresponding control parameters do not meet the corresponding control indicators: the deflection of the deck surface of the semi-submersible barge is controlled by adjusting the load of the semi-submersible barge during the pier dropping process to meet the corresponding control indicators to ensure that the immersed tube sections do not crack.

[0029] The floating-state barge construction control method of the immersed tube section of the present invention can establish a multi-parameter system including monitoring parameters, control parameters and regulating parameters by designing a construction control multi-parameter system, wherein the monitoring parameters feedback the real-time data of the control parameters and the regulating parameters, and the regulating parameters regulate the control parameters, and the real-time data of the control parameters are controlled to meet the corresponding control indicators, thereby realizing safe and rapid barge of the immersed tube section; controlling the maximum difference of the oil pressure in the three zones of the transportation equipment by regulating the oil pressure of the transportation equipment to ensure that the immersed tube section does not crack during the barge process; adjusting the height of the pier on the ship based on numerical calculation before the barge is implemented, and controlling the deflection of the semi-submersible barge based on the semi-submersible barge load adjustment during the pier landing process to ensure that the immersed tube section does not crack during the pier landing process; formulating a loading adjustment plan according to the barge speed and tidal level changes before the barge is implemented, and controlling the height difference between the dock surface and the stern deck surface and the floating state of the semi-submersible barge to meet the corresponding control indicators based on the barge speed adjustment and the semi-submersible barge load adjustment during the barge process, thereby ensuring the smooth movement of the transportation equipment and the stability and safety of the semi-submersible barge during the barge process, thereby realizing safe barge of the immersed tube section.

[0030] As a preferred solution of the present invention, numerical calculation is used to analyze the influence of the loading adjustment scheme on the buoyancy of the semi-submersible barge and the height difference between the dock surface and the stern deck surface, so as to fully understand how to use the semi-submersible barge loading adjustment to cope with the control needs of the buoyancy of the semi-submersible barge and the height difference between the dock surface and the stern deck surface under different tidal changes, and use it as a basis for rapid control decisions during the barge loading process to assist in formulating the semi-submersible barge loading adjustment plan for the barge loading construction.

[0031] As a preferred embodiment of the present invention, in step S2, numerical calculation is used to analyze the construction conditions of the immersed tube segment dropping into the piers, the height of the shipboard piers is adjusted according to the calculation results, and the shipboard piers on the semi-submersible barge are set to form a pre-arch as a whole, so that the bottom surface of the immersed tube segment is in a horizontal state after the piers are dropped.

[0032] As a preferred embodiment of the present invention, in step S3, when there is a large difference between the actual tidal level change and the predicted tidal level change, the height difference between the dock surface and the stern deck of the semi-submersible barge and the buoyancy of the semi-submersible barge are controlled by adjusting the barge loading speed and coordinating the semi-submersible barge load adjustment to meet the corresponding control indicators.

[0033] As a preferred solution of the present invention, when the actual tidal level change is greater than the predicted tidal level change, and the semi-submersible barge's load-adjusting capacity cannot cope with the regulation requirements of the rapid tidal level change, the barge loading speed can be accelerated, and the semi-submersible barge's load-adjusting can be coordinated to control the height difference between the dock surface and the stern deck surface, and the buoyancy of the semi-submersible barge, so as to meet the corresponding control indicators;

[0034] When the actual tidal change is smaller than the predicted tidal change, and the semi-submersible barge's loading capacity cannot meet the demand for regulating the predetermined barge loading speed, the barge loading speed can be slowed down, waiting for the tide, and the semi-submersible barge's loading can be used to control the height difference between the dock surface and the stern deck surface, and the buoyancy of the semi-submersible barge, so as to meet the corresponding control indicators.

[0035] As a preferred solution of the present invention, in step S3, whether to perform regulation is determined based on whether the real-time data of the control parameter exceeds 80% of the control index. If the real-time data of the control parameter is within 80% of the control index, regulation is not performed and the transfer is continued. If the real-time data of the control parameter exceeds 80% of the control index, regulation is required until the real-time data of the control parameter is within 50% of the control index, and then regulation is stopped.

[0036] As a preferred embodiment of the present invention, the monitoring system is arranged as follows:

[0037] The first monitoring point is arranged on the dock surface and the stern of the semi-submersible barge to obtain the height difference between the dock surface and the stern deck surface in real time, and the height difference between the dock surface and the stern deck surface is fed back through the height difference between the first monitoring point on the dock surface and the first monitoring point on the stern deck surface;

[0038] A second monitoring point is arranged at the front end of the immersed tube segment to obtain the real-time coordinates of the front end of the immersed tube segment in real time, and the speed of the submerged tube segment being raised is fed back through the real-time coordinates of the front end of the immersed tube segment;

[0039] Arrange the third monitoring point at the four corners of the semi-submersible barge to obtain the draft of the four corners of the semi-submersible barge in real time, and feedback the floating state of the semi-submersible barge through the draft monitoring of the four corners of the semi-submersible barge;

[0040] Arrange a fourth monitoring point in the semi-submersible barge cabin to obtain the water level height of the semi-submersible barge cabin in real time;

[0041] The fifth monitoring point is arranged at the bow and stern of the semi-submersible barge and in the middle of the longitudinal span to obtain the elevation of the semi-submersible barge deflection measuring point in real time, and the sixth monitoring point is set to obtain the tide level in real time. The deflection of the semi-submersible barge is fed back through the tide level and the elevation of the semi-submersible barge deflection measuring point.

[0042] As a preferred solution of the present invention, a first monitoring point is arranged on both sides of the front and rear decks of the dock; and a plurality of fifth monitoring points are evenly arranged longitudinally of the semi-submersible barge.

[0043] As a preferred embodiment of the present invention, the floating state of the semi-submersible barge includes trim and heel, wherein the trim reflects the height difference between the bow and the stern, and the heel reflects the height difference between the left and right sides of the semi-submersible barge.

[0044] As a preferred embodiment of the present invention, in step S2:

[0045] (1) Establish control indicators for control parameters:

[0046] Through numerical calculation, the influence of wind speed and wave height on the motion response of semi-submersible barge under moored state is analyzed, and the wind speed and wave height with less influence on the motion response of semi-submersible barge are selected as control indicators.

[0047] According to the analysis of the semi-submersible barge's load-adjusting capacity, it is chosen to be transferred to a barge during the rising tide. Considering that the semi-submersible barge's ballast water load-adjusting capacity can replace the weight of the submerged tube, the amount of the semi-submersible barge that sinks due to the weight of the submerged tube during the transfer process should be as large as possible. The amount of the semi-submersible barge that floats due to the rising tide, and the tidal level change speed is less than 1m / h;

[0048] According to the analysis of the transport equipment's walking capacity, the height difference between the dock surface and the stern deck surface is set to be controlled within ±5cm;

[0049] According to the safety analysis of the transport equipment's traveling ability and the semi-submersible barge's stability, the semi-submersible barge's longitudinal and transverse inclination are controlled within 1°;

[0050] According to the stress analysis of the immersed tube segment, the maximum difference of the oil pressure in the three zones of the transport equipment is controlled within 5%, and the deflection of the deck of the semi-submersible barge is controlled within 10cm;

[0051] (2) Advance control before the launch:

[0052] Optimize the window for lightering operations: observe the wind, wave and tide conditions near the lightering area, analyze the wind, wave and tide changes in the next few days or months based on the tide table, and select a time period that meets the wind, wave and tide control indicators and has relatively good wind, wave and tide conditions;

[0053] Calculation and analysis of the height of the piers on board: numerical calculation is used to analyze the construction conditions of the immersed tube segment pier placement. The height of the piers on board is adjusted so that the bottom surface of the immersed tube segment is basically in a horizontal state after the pier placement. The height of the piers on board is adjusted based on the calculation results.

[0054] Calculation of loading and unloading scheme: Set the loading speed to 1m / min, consider the change of tide level, and calculate and analyze the loading and unloading process according to the moment balance principle to obtain the loading and unloading scheme. The calculation and analysis method is as follows: simplify the ship force to the midpoint as the moment center, and calculate the front and rear gravity as the acting force. The calculation formula of the loading moment is: (F 1 +F W )×L 1 =F 2 ×L 2 ;

[0055] Where: F 1 ——barge weight (in kN);

[0056] F W ——weight of ballast water at the stern (in kN);

[0057] L 1 - distance from the stern weight to the centroid (in m);

[0058] F 2 ——weight of bow ballast water (unit: kN);

[0059] L 2 ——Distance from bow weight to centroid (in m).

[0060] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0061] 1. The floating state barge construction control method of the immersed tube section of the present invention can establish a multi-parameter system including monitoring parameters, control parameters and regulating parameters by designing a construction control multi-parameter system, wherein the monitoring parameters feedback the real-time data of the control parameters and the regulating parameters, and the regulating parameters regulate the control parameters, and the real-time data of the control parameters are controlled to meet the corresponding control indicators, thereby realizing safe and rapid barge of the immersed tube section; the maximum difference of the oil pressure in the three zones of the transportation equipment is controlled by regulating the oil pressure of the transportation equipment to ensure that the immersed tube section does not crack during the barge process; the height of the pier on the ship is adjusted based on numerical calculation before the barge is implemented, and the deflection of the semi-submersible barge is controlled based on the semi-submersible barge load adjustment during the pier landing process to ensure that the immersed tube section does not crack during the pier landing process; the loading adjustment plan is formulated according to the barge speed and tide level changes before the barge is implemented, and the height difference between the dock surface and the stern deck surface and the floating state of the semi-submersible barge are controlled based on the barge speed adjustment and the semi-submersible barge load adjustment during the barge process to meet the corresponding control indicators, thereby ensuring the smooth movement of the transportation equipment and the stability and safety of the semi-submersible barge during the barge process, thereby realizing safe barge of the immersed tube section.

[0062] It can select the working conditions before the barge is launched and control the subsequent risks in advance. During the barge launch and pier drop process, it can rely on the construction control multi-parameter system to perform corresponding control according to the real-time data obtained, to ensure that the transportation equipment can move smoothly during the barge launch, and to ensure that the submerged tube sections do not crack during the barge launch and pier drop process, and that the stability and safety of the semi-submersible barge meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 It is a control flow diagram of the construction control multi-parameter system of the present invention;

[0064] Figure 2 It is a control logic schematic diagram of the construction control multi-parameter system of the present invention;

[0065] Figure 3 It is a schematic diagram of the arrangement of monitoring points;

[0066] Figure 4 This is a schematic diagram to analyze the influence of wind speed, wave height, etc. on the motion response of semi-submersible barge under mooring state. Figure 1 ;

[0067] Figure 5 This is a schematic diagram to analyze the influence of wind speed, wave height, etc. on the motion response of semi-submersible barge under mooring state. Figure 2 ;

[0068] Figure 6 It is a schematic diagram of the analysis of setting the control indexes of the maximum difference of the oil pressure in the three zones of the transport equipment and the deflection of the deck surface of the semi-submersible barge through the force analysis of the immersed tube segment;

[0069] Figure 7 It is a schematic diagram of the construction conditions of the immersed tube section falling into the pier using numerical calculation analysis;

[0070] Figure 8 It is a schematic diagram of the deformation of the semi-submersible barge and the immersed tube section when landing;

[0071] Fig. 9 This is a schematic diagram of the reaction force of the pier on the ship when no height adjustment is performed;

[0072] Fig.10 It is a schematic diagram of the reaction force of the pier on the ship after the height is adjusted;

[0073] Fig.11 It is a schematic diagram that simplifies the ship's forces into the midpoint as the moment center and the front and rear gravity as the forces for calculation;

[0074] Fig.12 It is a schematic diagram of the load adjustment table of the load adjustment plan;

[0075] Fig.13 It is a schematic diagram showing that the semi-submersible barge cabin is divided into the bow cabin, the middle cabin and the stern cabin;

[0076] Fig.14 This is a schematic diagram of the stern docking and mooring of a semi-submersible barge;

[0077] Fig.15 It is a schematic diagram of the three-zone division of transportation equipment. DETAILED DESCRIPTION

[0078] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0079] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0080] Example 1

[0081] This embodiment provides a method for controlling floating barge-up of an immersed tube segment, comprising the following steps:

[0082] S1. Design of multi-parameter system for construction control; see Figure 1 and Figure 2 ,The multi-parameter system includes: feedback of the real-time conditions of the control parameters and the regulation parameters through the monitoring parameters, the control of the control parameters is achieved through the real-time regulation of the regulation parameters, and the control target is achieved through the control of the control parameters;

[0083] The control objectives include the smooth movement of the transport equipment during the process of loading and unloading, the stability and safety of the semi-submerged barge, and the non-cracking of the immersed tube sections. The transport equipment can be a SPMT vehicle or a trolley.

[0084] The control parameters include wind speed and wave height, tide level change speed, height difference between the dock surface and the stern deck surface, semi-submersible barge floating state, semi-submersible barge deck deflection, and maximum difference in oil pressure in three areas of the transport equipment; the semi-submersible barge floating state includes longitudinal inclination and transverse inclination; Fig.15 As shown, the front end of the three zones of the transport equipment is symmetrically divided into two zones, namely, the ② zone and the ③ zone, and the rear end is divided into one zone, namely, the ① zone;

[0085] Monitoring parameters include wind and wave monitoring, tide level monitoring, dock elevation monitoring, stern deck elevation monitoring, semi-submersible barge four-corner draft monitoring, semi-submersible barge deflection monitoring, transport equipment oil pressure monitoring, immersed tube section front end coordinate monitoring, and semi-submersible barge cabin water level monitoring;

[0086] The monitoring parameters need to be monitored and fed back in real time by deploying a monitoring system. In one or more embodiments, the monitoring system is deployed as follows:

[0087] The first monitoring point is arranged on the dock surface and the stern of the semi-submersible barge to obtain the height difference between the dock surface and the stern deck surface in real time. Figure 3 The first monitoring point on the stern deck ( Figure 3 The height difference between the dock surface and the stern deck surface is fed back by using the height difference of the stern deck surface elevation monitoring point in the image. Preferably, a first monitoring point is arranged on each side of the dock front and the stern deck surface, and a first monitoring point is arranged on each side of the stern deck surface, so that the stern elevation can be obtained more accurately. The above-mentioned arrangement of the first monitoring points can more accurately obtain the height difference between the dock surface and the ship.

[0088] Arrange the second monitoring point at the front end of the immersed tube segment ( Figure 3 The real-time coordinates of the front end of the immersed tube segment are obtained in real time by using the real-time coordinates of the front end of the immersed tube segment to feedback the speed of the immersed tube segment being loaded;

[0089] The third monitoring point is arranged at the four corners of the semi-submersible barge ( Figure 3 The draft of the semi-submersible barge at the four corners is obtained in real time (the draft monitoring points at the four corners of the semi-submersible barge). The buoyancy of the semi-submersible barge is fed back through the draft monitoring at the four corners of the semi-submersible barge.

[0090] The fourth monitoring point is arranged in the semi-submersible barge cabin to obtain the water level of the semi-submersible barge cabin in real time, and the amount of ballast water in the cabin is fed back through the water level of the semi-submersible barge cabin to support the semi-submersible barge load adjustment;

[0091] The fifth monitoring point is arranged at the mid-span of the semi-submersible barge in the bow, stern and longitudinal directions ( Figure 3The deflection monitoring point of the semi-submersible barge in the semi-submersible barge is used to obtain the elevation of the deflection measuring point of the semi-submersible barge in real time, and the sixth monitoring point is set to obtain the tide level in real time. The change amount and speed of the tide level are fed back through tide level monitoring, and the deflection of the semi-submersible barge is fed back through the tide level and the elevation of the deflection measuring point of the semi-submersible barge. More preferably, a number of fifth monitoring points are evenly arranged in the longitudinal direction of the semi-submersible barge, which can more accurately obtain the longitudinal deflection of the semi-submersible barge, which is conducive to analyzing the longitudinal load adjustment required for the semi-submersible barge.

[0092] The control parameters include the speed of loading, the load adjustment of the semi-submersible barge and the height of the pier on board;

[0093] S2. Construction preparation before loading based on multi-parameter system, including the following steps:

[0094] (1) Establish control indicators for control parameters:

[0095] According to the analysis of the response of wind and waves to the motion of the semi-submersible barge under the moored state, the control indicators of wind speed and wave height are set;

[0096] In one or more embodiments, optionally, Figure 4 and Figure 5 As shown in the figure, through numerical calculation, the influence of wind speed, wave height, etc. on the motion response of the semi-submersible barge in the moored state is analyzed, and the wind speed and wave height with less influence on the motion response of the semi-submersible barge are selected as control indicators; for example: the analysis results show that when the wind speed is below level 3 and the wave height is less than 0.5m, the wind and wave have little influence on the motion response of the semi-submersible barge, and the wind speed less than or equal to level 3 and the wave height less than or equal to 0.5m are used as the control indicators of wind and waves.

[0097] According to the analysis of the semi-submersible barge's load-adjusting capacity, set the control index of the tide level change speed;

[0098] In one or more embodiments, optionally, Figure 6 As shown in the figure, according to the analysis of the semi-submersible barge's load-adjusting capacity, it is chosen to carry out the barge-up during the rising tide. Considering that the semi-submersible barge's ballast water load-adjusting capacity can replace the weight of the submerged tube, the weight of the submerged tube on the barge-up process should make the semi-submersible barge sink as much as possible due to the weight of the submerged tube on the barge-up process, and the semi-submersible barge should float as much as possible due to the rising tide. The speed of tide level change is less than 1m / h.

[0099] According to the analysis of the transport equipment's walking capacity, a control index of the height difference between the dock surface and the stern deck surface is set; in one or more embodiments, optionally, according to the analysis of the transport equipment's walking capacity, the height difference between the dock surface and the stern deck surface is set to be controlled within ±5 cm;

[0100] According to the walking ability of the transport equipment and the safety analysis of the semi-submersible barge's stability, the control index of the semi-submersible barge's floating state is set; in one or more embodiments, optionally, according to the walking ability of the transport equipment and the safety analysis of the semi-submersible barge's stability, the semi-submersible barge's longitudinal inclination and transverse inclination are set to be controlled within 1°;

[0101] According to the stress analysis of immersed tube segments, Figure 6 As shown, the control indexes of the deck deflection of the semi-submersible barge and the maximum difference of the oil pressure in the three zones of the transport equipment are set; in one or more embodiments, optionally, according to the stress analysis of the immersed tube section, the maximum difference of the oil pressure in the three zones of the transport equipment is set to be controlled within 5%, and the deck deflection of the semi-submersible barge is controlled to be controlled within 10 cm;

[0102] (2) Advance control before the launch:

[0103] Wind speed, wind direction and wave height are fed back through wind and wave monitoring. If the wind speed and wave height exceed the control index, the barge construction will not be carried out;

[0104] Tidal level monitoring reflects the speed of tidal level changes, and determines whether to carry out the barge construction according to the speed of tidal level changes. If the speed of tidal level changes exceeds the control index and the semi-submersible barge's load-adjusting capacity cannot cope with the rapid tidal level changes, the barge construction will not be carried out;

[0105] In one or more embodiments, the barge construction operation window is optionally selected: observe the wind, wave and tide conditions near the barge loading area, analyze the wind, wave and tide changes in the next few days or months in combination with the tide table, and select a time period that meets the control indicators of wind, wave and tide and has relatively good wind, wave and tide conditions;

[0106] Set the barge loading speed according to the travel capacity of the transport equipment, and formulate the semi-submersible barge loading plan for the barge loading construction according to the barge loading speed and the speed of tide level change;

[0107] In one or more embodiments, Fig.11 As shown in the figure, the calculation of the barge loading scheme is as follows: the barge loading speed is set to 1m / min, the tide level change is considered, and the loading adjustment during the barge loading process is calculated and analyzed according to the moment balance principle to obtain the barge loading scheme. The calculation and analysis method is as follows: the ship force is simplified to the midpoint as the moment center, and the front and rear gravity are used as the acting force for calculation. The formula for calculating the barge loading moment is: (F 1 +F W )×L 1 =F 2 ×L 2 ;

[0108] Where: F 1 ——barge weight (in kN);

[0109] F W ——weight of ballast water at the stern (in kN);

[0110] L 1 - distance from the stern weight to the centroid (in m);

[0111] F2 ——weight of bow ballast water (unit: kN);

[0112] L 2 ——Distance from bow weight to centroid (in m).

[0113] like Fig.12 As shown, in the calculated loading plan, it can be seen that for each barge-on process, the amount of ballast water in each ballast tank needs to be adjusted accordingly.

[0114] In one or more embodiments, in step S2, numerical calculation is used to analyze the influence of the loading adjustment scheme on the floating state of the semi-submersible barge and the height difference between the dock surface and the stern deck surface, and fully understand how to adjust the loading of the semi-submersible barge to cope with the control needs of the floating state of the semi-submersible barge and the height difference between the dock surface and the stern deck surface under different tidal changes, as a basis for rapid control decisions during the barge loading process, and assist in formulating the semi-submersible barge loading adjustment scheme for the barge loading construction. For example, when the stern deck surface is higher than the dock surface, Fig.13 As shown, the height difference between the dock surface and the stern deck surface can be adjusted by pressurizing water in the middle cabin. When the semi-submersible barge has a stern trim, the buoyancy of the semi-submersible barge can be adjusted by pressurizing water in the bow cabin and draining water from the stern cabin.

[0115] In addition, it is necessary to equip experienced operators, analyze the control steps to deal with rapid changes in tide levels, and have a clear control process. Through experienced operators and detailed control steps, the efficiency of on-site control decision-making can be improved, and emergencies such as rapid changes in tide levels can be dealt with, reducing construction risks.

[0116] The construction conditions of the immersed tube segment dropping into the pier are analyzed by numerical calculation, and the height of the pier on the ship is adjusted according to the calculation results, so that the bottom surface of the immersed tube segment is in a horizontal state after the pier is dropped; in one or more embodiments, optionally, Figure 7 As shown, the calculation and analysis of the height of the piers on board: numerical calculation is used to analyze the construction conditions of the immersed tube segment pier drop. By adjusting the height of the piers on board, the bottom surface of the immersed tube segment is basically in a horizontal state after the pier drop. The height of the piers on board is adjusted according to the calculation results; for example: the numerical calculation results show that if Figure 8 As shown, during the process of dropping the immersed tube, the semi-submersible barge will be deformed. The deformation of the semi-submersible barge will cause uneven force on the piers on the ship. Some piers on the ship will even become empty, which will cause the immersed tube to crack. By adjusting the height of the piers on the ship, the force on the piers on the ship can be evenly distributed, and the bottom surface of the immersed tube is basically in a horizontal state, thus avoiding cracking of the immersed tube sections.

[0117] In one or more embodiments, in step S2, numerical calculation is used to analyze the construction conditions of the immersed tube segment dropping into the pier, and the height of the ship's pier is adjusted according to the calculation results, and the ship's pier on the semi-submersible barge is set to form a pre-camber as a whole. By setting the pre-camber of the whole ship's pier in advance and using the adaptive adjustment ability of the ship's pier, the immersed tube segment can be prevented from cracking during the process of barge loading and dropping into the pier, so that the bottom surface of the immersed tube segment is in a horizontal state after dropping into the pier, and the force of the ship's pier is balanced. Fig. 9 As shown in Figure 1, the reaction force of the piers on the ship is unbalanced when the height is not adjusted. However, after the height is adjusted, Fig.10 As shown, the reaction force of the piers on the ship is in a balanced state, which can avoid cracking of the immersed tube sections.

[0118] S3. Start the barge construction, implement the set barge speed and load adjustment plan, and move the submerged tube segment from the dock to the semi-submerged barge through the transportation equipment. Then, make real-time adjustments based on the monitoring data until the submerged tube segment falls to the pier on the semi-submerged barge;

[0119] During the loading process, when the real-time data of the corresponding control parameters do not meet the corresponding control indicators:

[0120] By controlling the loading speed and the semi-submersible barge load adjustment, the height difference between the dock surface and the semi-submersible barge stern deck surface is controlled, and the buoyancy of the semi-submersible barge is controlled by semi-submersible barge load adjustment, so as to meet the corresponding control indicators and ensure the smooth operation of the transportation equipment;

[0121] During the process of loading and unloading, when the real-time data of the corresponding control parameters do not meet the corresponding control indicators:

[0122] The buoyancy of the semi-submersible barge is controlled by adjusting the load of the semi-submersible barge so as to meet the corresponding control indicators and ensure the stability and safety of the semi-submersible barge during the process of landing and landing;

[0123] And / or by adjusting the oil pressure of the transport equipment to control the maximum difference of the oil pressure in the three zones of the transport equipment so as to meet the corresponding control index to ensure that the submerged tube section does not crack during the barge loading process;

[0124] During the pier dropping process, when the real-time data of the corresponding control parameters do not meet the corresponding control indicators: the deflection of the deck surface of the semi-submersible barge is controlled by adjusting the load of the semi-submersible barge during the pier dropping process to meet the corresponding control indicators to ensure that the immersed tube sections do not crack.

[0125] In one or more embodiments, in step S3, when there is a large difference between the actual tidal level change and the predicted tidal level change, the height difference between the dock surface and the stern deck of the semi-submersible barge and the buoyancy of the semi-submersible barge are controlled by adjusting the loading speed and coordinating the loading of the semi-submersible barge to meet the corresponding control index. This solution is different from the predicted tidal level change, which makes the semi-submersible barge loading scheme formulated in step S2 for the loading construction based on the predicted tidal level not fully applicable, so it is necessary to re-formulate the semi-submersible barge loading scheme.

[0126] Furthermore, when the actual tidal level change is greater than the predicted tidal level change, and the semi-submersible barge's load-adjusting capacity cannot cope with the regulation needs of rapid tidal level changes, the height difference between the dock surface and the stern deck surface and the buoyancy of the semi-submersible barge can be controlled by speeding up the loading speed and coordinating the semi-submersible barge's load-adjusting to meet the corresponding control indicators.

[0127] When the actual tidal change is smaller than the predicted tidal change, and the semi-submersible barge's loading capacity cannot meet the demand for regulating the predetermined barge loading speed, the barge loading speed can be slowed down, waiting for the tide, and the semi-submersible barge's loading can be used to control the height difference between the dock surface and the stern deck surface, and the buoyancy of the semi-submersible barge, so as to meet the corresponding control indicators.

[0128] In one or more embodiments, in step S3, whether to perform regulation is determined based on whether the real-time data of the control parameter exceeds 80% of the control index. If the real-time data of the control parameter is within 80% of the control index, the barge is not regulated and continues to be loaded. If the real-time data of the control parameter exceeds 80% of the control index, regulation is required until the real-time data of the control parameter is within 50% of the control index, and regulation is stopped. Under the condition of ensuring that the index can meet the initial requirements, the efficiency of loading and regulation can be improved.

[0129] In view of the above-mentioned construction control method for floating barge of immersed tube sections, a specific construction and control process for floating barge of immersed tube sections is provided below:

[0130] ① Semi-submersible barge berth and mooring. The semi-submersible barge berths and aligns the longitudinal centerline of the semi-submersible barge with the centerline of the immersed tube section, and moors through the mooring piers and cables on the dock, such as Fig.14 shown.

[0131] ② Adjust the floating state of the semi-submersible barge and overlap the dock. Adjust the floating state of the semi-submersible barge to be flush with the dock surface, and control the height difference between the lifting deck and the dock within ±5cm. After the floating state adjustment is completed, overlap with steel plates with a thickness of 40mm-50mm.

[0132] ③ Adjustment of the height of the piers on board. The height of the piers on board is adjusted according to the calculation results, so that when the submerged tube falls on the pier, the bottom surface of the submerged tube is basically in a horizontal state, ensuring that the force on the joints of the submerged tube is balanced.

[0133] ④ Inspection before the transfer: Conduct a comprehensive inspection of the semi-submersible transfer equipment, SPMT vehicle, monitoring instruments and systems to ensure normal operation.

[0134] ⑤ Monitor the changes in wind, waves and tides. Determine whether the changes in wind, waves and tides meet the control requirements through monitoring data. If the changes in wind, waves and tides exceed the control indicators, cancel the barge construction. If the changes in wind, waves and tides meet the control requirements, carry out the barge construction. When the monitored tide level reaches the predetermined tide level, carry out the barge construction.

[0135] ⑥ Carry out the transfer according to the predetermined transfer speed of 1m / min and the calculated transfer plan.

[0136] ⑦ During the implementation of the barge operation, the real-time situation of the control parameters is evaluated through the monitoring data of the monitoring parameters. The control parameters include the height difference between the dock surface and the stern deck surface, the floating state of the semi-submersible barge, and the maximum difference in oil pressure in the three areas of the SPMT vehicle (or trolley). Whether the real-time data of the control parameters exceeds 80% of the control index is used as the basis for determining whether to make adjustments. If the real-time data of the control parameters is within 80% of the control index, the barge operation will continue without adjustment. If the real-time data of the control parameters exceeds 80% of the control index, adjustment is required.

[0137] ⑧ Evaluate the real-time data of the control parameters based on the monitoring data of the monitoring parameters, and adjust the control parameters according to the control requirements of the control parameters and the influence of the control parameters on the control parameters, until the real-time data of the control parameters is within 50% of the control index, and then stop the adjustment.

[0138] The maximum difference of the three-zone oil pressure of the SPMT vehicle (or trolley) is controlled by adjusting the three-zone oil pressure of the SPMT vehicle (or trolley), and the height difference between the dock surface and the stern deck surface and the floating state of the semi-submersible barge are controlled by adjusting the load of the semi-submersible barge.

[0139] In fact, during the process of barging, there may be a large difference between the actual tidal level change and the predicted tidal level change. When the tidal level changes greatly, the semi-submersible barge's load-adjusting capacity cannot cope with the regulation needs of rapid tidal level changes. The height difference between the dock and the stern deck and the floating state of the semi-submersible barge can be regulated by speeding up the barge loading speed and coordinating with the semi-submersible barge loading. When the tidal level changes slowly, the semi-submersible barge's load-adjusting capacity cannot cope with the regulation needs of the scheduled barge loading speed. The height difference between the dock and the stern deck and the floating state of the semi-submersible barge can be regulated by slowing down the barge loading speed, waiting for the tide, and coordinating with the semi-submersible barge loading.

[0140] ⑨ During the pier dropping process, the immersed tube section is transferred from the support of the SPMT vehicle (or trolley) to the support of the pier on the ship. The deflection of the semi-submersible barge is controlled by adjusting the load of the semi-submersible barge to meet the control requirements, ensuring that after the pier dropping, the force on the pier on the ship tends to be uniform and the bottom surface of the immersed tube section is basically in a horizontal state.

[0141] The present embodiment provides a floating state barge construction control method for immersed tube segments, which can realize safe and rapid barge of immersed tube segments by establishing a multi-parameter system including monitoring parameters, control parameters, and regulation parameters, monitoring parameters feedback control parameters and real-time data of regulation parameters, regulation parameters regulate control parameters, and control real-time data of control parameters to meet corresponding control indicators; the maximum difference of oil pressure in three zones of the SPMT vehicle (or trolley) is controlled by oil pressure regulation of the SPMT vehicle (or trolley) to ensure that the immersed tube segments do not crack during the barge process; the height of the piers on the ship is adjusted based on numerical calculation before the barge is implemented, and the deflection of the semi-submersible barge is controlled based on the semi-submersible barge load adjustment during the pier landing process to ensure that the immersed tube segments do not crack during the pier landing process; the loading adjustment plan is formulated according to the barge speed and tide level changes before the barge is implemented, and the height difference between the dock surface and the stern deck surface and the floating state of the semi-submersible barge are controlled based on the barge speed adjustment and the semi-submersible barge load adjustment during the barge process to meet corresponding control indicators, so as to ensure that the SPMT vehicle (or trolley) moves smoothly and the stability of the semi-submersible barge is safe during the barge process, and realize safe barge of immersed tube segments.

[0142] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling floating barge-up of immersed tube segments, characterized in that: The following steps are involved: S1. Design of multi-parameter system for construction control; the multi-parameter system includes: feedback of real-time status of control parameters and regulation parameters through monitoring parameters, control of control parameters through real-time regulation of regulation parameters, and control objectives through control of control parameters; Among them, the control objectives include the smooth movement of the transport equipment during the process of loading and unloading, the stability and safety of the semi-submerged barge, and the non-cracking of the immersed tube sections; The control parameters include wind speed and wave height, tide level change speed, height difference between the dock surface and the stern deck surface, floating state of the semi-submersible barge, deflection of the semi-submersible barge deck surface, and maximum difference in oil pressure in the three areas of the transport equipment; Monitoring parameters include wind and wave monitoring, tide level monitoring, dock elevation monitoring, stern deck elevation monitoring, semi-submersible barge four-corner draft monitoring, semi-submersible barge deflection monitoring, transport equipment oil pressure monitoring, immersed tube section front end coordinate monitoring, and semi-submersible barge cabin water level monitoring; The control parameters include the speed of loading, the load adjustment of the semi-submersible barge and the height of the pier on board; S2. Construction preparation before loading based on multi-parameter system, including the following steps: (1) Establish control indicators for control parameters: According to the analysis of the response of wind and waves to the motion of the semi-submersible barge under the moored state, the control indicators of wind speed and wave height are set; According to the analysis of the semi-submersible barge's load-adjusting capacity, set the control index of the tide level change speed; According to the analysis of the transport equipment's traveling capacity, set the control index of the height difference between the dock surface and the stern deck surface; According to the safety analysis of the transport equipment's traveling ability and the semi-submersible barge's stability, set the control index of the semi-submersible barge's floating state; According to the stress analysis of the immersed tube segment, the control indicators of the deck deflection of the semi-submersible barge and the maximum difference of the oil pressure in the three zones of the transport equipment are set; (2) Advance control before the launch: Wind speed, wind direction and wave height are fed back through wind and wave monitoring. If the wind speed and wave height exceed the control index, the barge construction will not be carried out; Tidal level monitoring reflects the speed of tidal level changes, and determines whether to carry out the barge construction according to the speed of tidal level changes. If the speed of tidal level changes exceeds the control index and the semi-submersible barge's load-adjusting capacity cannot cope with the rapid tidal level changes, the barge construction will not be carried out; Set the barge loading speed according to the travel capacity of the transport equipment, and formulate the semi-submersible barge loading plan for the barge loading construction according to the barge loading speed and the speed of tide level change; Numerical calculations were used to analyze the construction conditions of the immersed tube segment dropping into the piers. The height of the piers on board was adjusted based on the calculation results, so that the bottom surface of the immersed tube segment was in a horizontal state after dropping into the piers. S3. Start the barge construction, implement the set barge speed and load adjustment plan, and move the submerged tube segment from the dock to the semi-submerged barge through the transportation equipment. Then, make real-time adjustments based on the monitoring data until the submerged tube segment falls to the pier on the semi-submerged barge; During the loading process, when the real-time data of the corresponding control parameters do not meet the corresponding control indicators: By controlling the loading speed and the semi-submersible barge load adjustment, the height difference between the dock surface and the semi-submersible barge stern deck surface is controlled, and the buoyancy of the semi-submersible barge is controlled by semi-submersible barge load adjustment, so as to meet the corresponding control indicators and ensure the smooth operation of the transportation equipment; During the process of loading and unloading, when the real-time data of the corresponding control parameters do not meet the corresponding control indicators: The buoyancy of the semi-submersible barge is controlled by adjusting the load of the semi-submersible barge so as to meet the corresponding control indicators and ensure the stability and safety of the semi-submersible barge during the process of landing and landing; And / or by adjusting the oil pressure of the transport equipment to control the maximum difference of the oil pressure in the three zones of the transport equipment so as to meet the corresponding control index to ensure that the submerged tube section does not crack during the barge loading process; During the pier dropping process, when the real-time data of the corresponding control parameters do not meet the corresponding control indicators: the deflection of the deck surface of the semi-submersible barge is controlled by adjusting the load of the semi-submersible barge during the pier dropping process to meet the corresponding control indicators to ensure that the immersed tube sections do not crack.

2. The method for controlling floating barge-up of immersed tube segments according to claim 1 is characterized in that: In step S2, numerical calculation is used to analyze the influence of the loading adjustment scheme on the floating state of the semi-submersible barge and the height difference between the dock surface and the stern deck surface, so as to fully understand how to use the semi-submersible barge loading adjustment to cope with the control needs of the floating state of the semi-submersible barge and the height difference between the dock surface and the stern deck surface under different tidal changes, so as to serve as the basis for rapid control decisions during the barge loading process and assist in formulating the semi-submersible barge loading adjustment scheme for the barge loading construction.

3. The method for controlling floating barge-up of immersed tube segments according to claim 1 is characterized in that: In step S2, numerical calculation is used to analyze the construction conditions of the immersed tube segment dropping into the piers, and the height of the shipboard piers is adjusted according to the calculation results, and the shipboard piers on the semi-submersible barge are set to form a pre-arch as a whole, so that the bottom surface of the immersed tube segment is in a horizontal state after the piers are dropped.

4. The method for controlling floating barge-up of immersed tube segments according to claim 1 is characterized in that: In step S3, when there is a large difference between the actual tidal level change and the predicted tidal level change, the height difference between the dock surface and the stern deck of the semi-submersible barge and the buoyancy of the semi-submersible barge are controlled by adjusting the loading speed and coordinating the loading of the semi-submersible barge to meet the corresponding control indicators.

5. The method for controlling floating barge-up of immersed tube segments according to claim 4 is characterized in that: When the actual tidal level change is greater than the predicted tidal level change, and the semi-submersible barge's load-adjusting capacity cannot cope with the rapid tidal level change regulation needs, the height difference between the dock surface and the stern deck surface and the buoyancy of the semi-submersible barge can be controlled by speeding up the loading speed and coordinating the semi-submersible barge's load-adjusting to meet the corresponding control indicators; When the actual tidal change is smaller than the predicted tidal change, and the semi-submersible barge's loading capacity cannot meet the demand for regulating the predetermined barge loading speed, the barge loading speed can be slowed down, waiting for the tide, and the semi-submersible barge's loading can be used to control the height difference between the dock surface and the stern deck surface, and the buoyancy of the semi-submersible barge, so as to meet the corresponding control indicators.

6. The method for controlling floating barge-up of immersed tube segments according to claim 1 is characterized in that: In step S3, whether to perform regulation is determined based on whether the real-time data of the control parameter exceeds 80% of the control index. If the real-time data of the control parameter is within 80% of the control index, no regulation is performed and the process continues. If the real-time data of the control parameter exceeds 80% of the control index, regulation is required until the real-time data of the control parameter is within 50% of the control index, and then regulation is stopped.

7. The method for controlling floating barge-up of immersed tube segments according to any one of claims 1 to 6, characterized in that: Arrange the monitoring system as follows: The first monitoring point is arranged on the dock surface and the stern of the semi-submersible barge to obtain the height difference between the dock surface and the stern deck surface in real time, and the height difference between the dock surface and the stern deck surface is fed back through the height difference between the first monitoring point on the dock surface and the first monitoring point on the stern deck surface; A second monitoring point is arranged at the front end of the immersed tube segment to obtain the real-time coordinates of the front end of the immersed tube segment in real time, and the speed of the submerged tube segment being raised is fed back through the real-time coordinates of the front end of the immersed tube segment; Arrange the third monitoring point at the four corners of the semi-submersible barge to obtain the draft of the four corners of the semi-submersible barge in real time, and feedback the floating state of the semi-submersible barge through the draft monitoring of the four corners of the semi-submersible barge; Arrange a fourth monitoring point in the semi-submersible barge cabin to obtain the water level height of the semi-submersible barge cabin in real time; The fifth monitoring point is arranged at the bow and stern of the semi-submersible barge and in the middle of the longitudinal span to obtain the elevation of the semi-submersible barge deflection measuring point in real time, and the sixth monitoring point is set to obtain the tide level in real time. The deflection of the semi-submersible barge is fed back through the tide level and the elevation of the semi-submersible barge deflection measuring point.

8. The method for controlling floating barge-up of immersed tube segments according to claim 7 is characterized in that: A first monitoring point is arranged on both sides of the front and rear decks of the dock, and a number of fifth monitoring points are evenly arranged longitudinally of the semi-submersible barge.

9. The method for controlling floating barge-up of immersed tube segments according to claim 7 is characterized in that: The buoyancy of a semi-submersible barge includes longitudinal inclination and transverse inclination.

10. The method for controlling floating barge-up of immersed tube segments according to any one of claims 1 to 6, characterized in that: In step S2: (1) Establish control indicators for control parameters: Through numerical calculation, the influence of wind speed and wave height on the motion response of semi-submersible barge under moored state is analyzed, and the wind speed and wave height with less influence on the motion response of semi-submersible barge are selected as control indicators. According to the analysis of the semi-submersible barge's load-adjusting capacity, it is chosen to be transferred to a barge during the rising tide. Considering that the semi-submersible barge's ballast water load-adjusting capacity can replace the weight of the submerged tube, the amount of the semi-submersible barge that sinks due to the weight of the submerged tube during the transfer process should be as large as possible. The amount of the semi-submersible barge that floats due to the rising tide, and the tidal level change speed is less than 1m / h; According to the analysis of the transport equipment's walking capacity, the height difference between the dock surface and the stern deck surface is set to be controlled within ±5cm; According to the safety analysis of the transport equipment's traveling ability and the semi-submersible barge's stability, the semi-submersible barge's longitudinal and transverse inclination are controlled within 1°; According to the stress analysis of the immersed tube segment, the maximum difference of the oil pressure in the three zones of the transport equipment is controlled within 5%, and the deflection of the deck of the semi-submersible barge is controlled within 10cm; (2) Advance control before the launch: Optimize the window for lightering operations: observe the wind, wave and tide conditions near the lightering area, analyze the wind, wave and tide changes in the next few days or months based on the tide table, and select a time period that meets the wind, wave and tide control indicators and has relatively good wind, wave and tide conditions; Calculation and analysis of the height of the piers on board: numerical calculation is used to analyze the construction conditions of the immersed tube segment pier placement. The height of the piers on board is adjusted so that the bottom surface of the immersed tube segment is basically in a horizontal state after the pier placement. The height of the piers on board is adjusted based on the calculation results. Calculation of loading and unloading scheme: Set the loading speed to 1m / min, consider the change of tide level, and calculate and analyze the loading and unloading process according to the moment balance principle to obtain the loading and unloading scheme. The calculation and analysis method is as follows: simplify the ship force to the midpoint as the moment center, and calculate the front and rear gravity as the acting force. The calculation formula of the loading moment is: (F1+F W )×L1=F2×L2; Where: F1——barge weight (unit: kN); F W ——weight of ballast water at the stern (in kN); L1 - distance from the stern weight to the centroid (in meters); F2——weight of bow ballast water (unit: kN); L2 - distance from bow weight to centroid (in m).

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