A self-floating and submerging positioning installation device and construction method for a steel frame using airbags to assist floating

Abstract

A self-floating and submerging positioning installation device for a steel frame using airbags for buoyancy assistance is provided on the steel frame, at least one vertical airbag is provided on each vertical side of the steel frame, at least one horizontal airbag is provided on each horizontal side of the bottom of the steel frame, a plurality of lifting rings are provided on the steel frame, the vertical airbags and the horizontal airbags are both connected with slings, a hydraulic unhooker is connected between the slings and the lifting rings, the vertical airbags and the horizontal airbags are both provided with inflation and deflation control valves, the inflation and deflation control valve signals are connected with a central inflation and deflation controller, and the four corners of the steel frame are all connected to a positioning ship with a positioning anchor cable through cables. The beneficial effects of the present invention are: it can be directly self-floating in a dock, and then floated and towed to a designated installation site, significantly reducing the dependence on ship equipment resources, reducing construction costs, and shortening the construction period.

Description

Technical Field

[0001] The invention relates to a self-floating, diving, positioning and installing device for a steel frame using air bags to assist floating, and a construction method. Background Art

[0002] At present, in the field of marine engineering, there are many steel frames installed on the seabed to provide support for the upper equipment. For example, the jacket of the offshore drilling platform is a typical steel frame used to support the upper oil production module. It is usually huge in size, tens of meters long and high, with a total volume of several thousand tons to tens of thousands of tons. As the base of offshore wind power, the base steel frame is also installed on the seabed in the form of legs, and the stress state of the base is relatively complex, requiring high installation accuracy. Currently, in the seafood farming industry, it is popular to install steel frames carrying many breeding boxes in designated offshore breeding areas. In order to pursue larger breeding space, the steel frame is huge in size, but the weight is relatively light compared to the jacket, and the installation accuracy is low. Steel frames with similar structures to the above meet the special needs of various industries, and the design, manufacture, installation and future removal of the steel frame have become professional technologies.

[0003] During the installation of steel frames, floating crane installation is generally used. Usually, after the construction site is completed, it is transferred to a ship or semi-submersible vessel. After being transported to the installation site, another floating crane is used to lift the steel frame, and then it is lowered to the seabed by a crane. After positioning, the subsequent piling and fixing operations are carried out. This is a more traditional construction process method with a complete process, rich construction experience, and low construction risk. However, in practice, floating crane resources are often limited. Sometimes it takes half a year or a year to determine the construction schedule of semi-submersible vessels and floating cranes. When there is tension or difficulty in coordination, the construction period is delayed. For large steel frames, the floating crane used has a large lifting capacity and the construction ship rental fee is high.

[0004] The patent (ZL201310363290.1) discloses a method for offshore installation of deepwater jackets using airbags. Several airbag groups are vertically installed on the upper part of the jacket, which can provide a certain buoyancy for the deepwater jacket. This helps to design the diameter of the rods in the wave-sensitive area to the minimum value allowed in the construction of the jacket rods, effectively reducing the environmental forces on the jacket and fundamentally reducing the demand for jacket stiffness. After the jacket is launched into the water, it can float vertically, but a floating crane is still required for lifting and positioning during construction. In actual applications, many construction plans are exploring non-lifting installation methods to reduce dependence on large floating cranes and reduce construction costs. Some construction projects actually use airbags to assist floating, which has a certain buoyancy effect, but still does not break away from dependence on various floating cranes. Moreover, in the actual use of air bags for buoyancy assistance, some problems are also exposed, such as positioning problems. Due to the impact of ocean currents on the air bags, the steel frame appears to sway or rock left and right in the water, making it impossible to position the crane and failing to achieve the positioning accuracy requirements of the installation site. For example, the difficulty in removing the buoyancy fixing points of the air bags requires divers to dive for manual removal. Due to the large number of hanging points, the removal operation takes a long time. The use of underwater robots in deep water areas results in higher equipment usage fees, resulting in the construction cost being saved on the rental of the floating crane, but more money being spent on removal. Summary of the invention

[0005] In order to solve the above technical deficiencies, the present invention provides a self-floating and diving positioning installation device and construction method for a steel frame using air bags to assist floating, which does not require lifting of the steel frame, saves construction equipment, and reduces construction costs.

[0006] The present invention is achieved by the following measures:

[0007] A device for self-floating and diving positioning installation of a steel frame using air bags to assist flotation is arranged on the steel frame, at least one vertical air bag is arranged on each vertical side of the steel frame, at least one horizontal air bag is arranged on each horizontal side of the bottom of the steel frame, a plurality of lifting rings are arranged on the steel frame, the vertical air bags and the horizontal air bags are both connected with lifting belts, a hydraulic unhooker is connected between the lifting belts and the lifting rings, the vertical air bags and the horizontal air bags are both provided with inflation and deflation control valves, the inflation and deflation control valve signals are connected to a central inflation and deflation controller, and the four corners of the steel frame are connected to a positioning ship with a positioning anchor cable on the outside through cables.

[0008] The hydraulic unhooking device comprises a lifting ear seat connected to the lifting strap, and the left and right sides of the lifting ear seat are integrally extended downward with a clamping plate, a receiving groove is left between the two clamping plates, and pin holes are provided on the two clamping plates, and a pin shaft that can horizontally penetrate the receiving groove and the lifting ring is movably passed through the pin hole, and the left side of the clamping plate on the left side of the lifting ear seat is connected to a mounting plate, and the left side of the mounting plate is connected to a cylindrical cylinder body that extends horizontally to the left and right and is hollow inside, and a piston that can slide left and right in the cylinder body is provided in the cylinder body, and a through hole is provided in the center of the mounting plate, and the left end of the pin shaft extends into the cylinder body through the through hole and engages with the piston The center of the right end face is connected, the inner diameter of the cylinder body and the diameter of the right end face of the piston are both larger than the inner diameter of the through hole, the outer circumferential surface of the piston and the inner wall surface of the cylinder body as well as the outer circumferential surface of the pin shaft and the inner wall surface of the through hole are in sealed sliding contact, a circular oil inlet groove is opened on the outer circumferential surface of the right end of the piston, the oil inlet groove is connected with the left end face of the mounting plate, a pin pulling oil inlet port connected with the oil inlet groove is arranged on the right end side wall of the cylinder body, a compression spring is arranged between the left end face of the piston and the left end face of the cylinder body, and a drain port is opened on the left end face of the cylinder body.

[0009] The present invention also includes a semi-submersible vessel, on which a guide rail vehicle capable of bearing a steel frame is arranged, and tracks are laid on the bottom of the semi-submersible vessel.

[0010] The steel frame is square, and a vertical airbag is arranged on the outside of each right-angled vertical side and on both sides of the right-angled vertical side of the steel frame, and a horizontal airbag is arranged on each of the four horizontal sides at the bottom of the steel frame.

[0011] A construction method for a self-floating and submerging positioning installation device for a steel frame using air bags to assist buoyancy, comprising:

[0012] Follow these steps:

[0013] Step 1: Install the positioning installation assembly on the steel frame, inflate the horizontal airbags and the vertical airbags, place the steel frame on the guide rail vehicle and transport it to the semi-submersible vessel, then tow the semi-submersible vessel to the installation site of the steel frame, and pre-tighten the steel frame through four positioning vessels;

[0014] Step 2: The semi-submersible vessel slowly dives, and under the buoyancy of the horizontal airbag and the vertical airbag, the steel frame detaches from the guide rail vehicle and remains in a stable floating state, and then the horizontal airbag is deflated to make the steel frame slowly dive;

[0015] Step 3: After the horizontal airbag is completely deflated, the vertical airbag is deflated until the steel frame continues to dive to the bottom installation position. The positioning ship releases the cable in time, the hydraulic unhooking device automatically unhooks, and the horizontal and vertical airbags float up for recovery.

[0016] In step 3, during the process of deflating the vertical airbags, four groups of vertical airbags on the four corners of the steel frame are deflated simultaneously, and the three vertical airbags in each group of vertical airbags are deflated cyclically to ensure that the buoyancy of the steel frame at the four corners remains consistent.

[0017] In step 3, ballast water is added to the lumen of the steel frame to increase the deadweight of the steel frame and enable the steel frame to dive.

[0018] The beneficial effects of the present invention are as follows: 1. The steel frame is self-floating and positioned by the anchor ship without using a floating crane, and a hydraulic unhooking device is used to realize automatic removal of each hanging point. 1. No floating crane is used during the self-floating and diving process of the steel frame; 2. From the self-floating of the steel frame to the completion of the installation and positioning, multiple anchor ships are used for traction and positioning, and multiple machines cooperate to tighten the steel frame, eliminating the impact of ocean currents and waves on the steel frame, reducing deviation and shaking, and reducing positioning errors; 3. A hydraulic unhooker is used to realize the automatic removal of each hanging point, with a short action process, shortening the removal time, and no need for divers to go into the water for underwater removal, reducing manual labor and unexpected risks of underwater operations. Hydraulic unhookers with different structures can meet the underwater unhooking in deep water areas, reduce dependence on underwater robots, reduce construction costs, and shorten the construction period; 4. Various airbags, pipelines, controllers, hydraulic unhookers, etc. can be reused, and can be combined as needed to realize the airbag arrangement and buoyancy provision of steel frames of different structures and weights. The entire set of equipment is expected to have a cycle life of at least 5 times or multiple uses within 3 years, significantly reducing the cost sharing of each construction cost, and convenient maintenance and low cost. 5. When the steel frame is built in the dock, it can float directly in the dock and then float and tow to the designated installation site. No semi-submersible vessel or floating crane is needed throughout the process. Only tugboat and positioning ship are needed, which significantly reduces the dependence on ship equipment resources, reduces construction costs, and shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the structure of the present invention in a top view when it is in a state of being towed by a positioning vessel.

[0021] Figure 3 It is a structural schematic diagram of the steel frame of the present invention in a sinking state.

[0022] Figure 4 It is a schematic diagram of the structure after the steel frame of the present invention is installed.

[0023] Figure 5 It is a structural schematic diagram of the hydraulic unhooking device of the present invention.

[0024] Among them: 1 steel frame, 2 vertical airbag, 3 horizontal airbag, 4 semi-submersible vessel, 5 guide rail car, 6 positioning anchor cable, 7 air pipe, 8 centralized control end, 9 central charging and discharging controller, 11 unhooking device hydraulic controller, 12 hydraulic pipeline, 13 hydraulic unhooking device, 14 lifting ear seat, 15 splint, 16 mounting plate, 17 pin shaft, 18 pin oil inlet, 19 piston, 20 compression spring, 21 cylinder body, 22 drainage outlet, 100 positioning ship, 101 winch, 102 anchor. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0026] like Figure 1 , 2 As shown in Figure 5, a device for self-floating and submerging steel frame using airbags to assist buoyancy is arranged on a steel frame 1. At least one vertical airbag 2 is arranged on each vertical side of the steel frame 1, and at least one horizontal airbag 3 is arranged on each horizontal side of the bottom of the steel frame 1. A number of lifting rings are arranged on the steel frame 1. The vertical airbags 2 and the horizontal airbags 3 are both connected with slings. A hydraulic unhooker is connected between the slings and the lifting rings. The vertical airbags 2 and the horizontal airbags 3 are both provided with inflation and deflation control valves. The inflation and deflation control valve signals are connected to a central inflation and deflation controller. The four corners of the steel frame 1 are all connected to a positioning ship 100 with a positioning anchor cable through cables. The head of the horizontal airbag 3 is inclined to pull the sling to prevent the airbag from swinging left and right when it is deflated, thereby affecting the displacement of the buoyancy center position generated by buoyancy. The semi-submersible ship 4 is responsible for transporting the steel frame 1 from the construction site to the installation waters. The guide rail vehicle 5 supports the steel frame 1 and can roll on the guide rail of the semi-submersible vessel 4. It is a sliding shipping device for transferring the steel frame 1 to the semi-submersible vessel 4. When the steel frame 1 is positioned by diving, the positioning ship 100 is used to tighten the positioning anchor cable 6 to install and position the steel frame 1. The air pipe 7 connects each air bag and the centralized control end 8, and the centralized control end 8 is a control device for inflating and deflating the air bag and detecting the pressure. The unhooking device hydraulic controller 11 controls each hydraulic unhooking device 13 to achieve the unhooking action; the hydraulic pipeline 12 is connected between the unhooking device hydraulic controller 11 and the hydraulic unhooking device 13. In order to improve the stability, the present invention also provides a semi-submersible vessel 4, on which a guide rail vehicle 5 capable of carrying the steel frame is provided, and a track is laid at the bottom of the semi-submersible vessel 4. The steel frame 1 is square, and a vertical air bag 2 is provided on the outside and both sides of each right-angled vertical side of the steel frame 1, and a horizontal air bag 3 is provided on each of the four horizontal sides at the bottom of the steel frame 1.

[0027] The central inflation and deflation controller 9 controls the four terminal controllers to realize inflation, deflation and pressure detection and recording of each airbag. The four ships at the four corners of the positioning ship 100 are symmetrically positioned, and the winch 101 on the positioning ship 100 retracts and releases the cable to tighten and relax the steel frame 1, so that the four positioning ships 100 coordinate to retract and release the positioning anchor cable 6, reduce the deflection and shaking caused by the impact of the ocean current on the steel frame 1 and the airbag, and position the steel frame 1; the anchor 102 of the positioning ship 100 plays the role of fixing the positioning ship 100.

[0028] The hydraulic unhooking device 13 includes a lifting ear seat 14 connected to the lifting belt, and a clamping plate 15 is integrally extended downward on both sides of the lifting ear seat 14, and a receiving groove is left between the two clamping plates 15. Pin holes are provided on the two clamping plates 15, and a pin shaft 17 that can horizontally penetrate the receiving groove is movably passed through the pin hole, and the pin shaft 17 can penetrate the lifting ring. The left side of the clamping plate 15 on the left side of the lifting ear seat 14 is connected to a mounting plate 16, and the left side of the mounting plate 16 is connected to a cylindrical cylinder body 21 that extends horizontally to the left and right and is hollow inside. A piston 19 that can slide left and right in the cylinder body 21 is provided in the cylinder body 21, and a through hole is provided in the center of the mounting plate 16. The left end of the pin shaft 17 passes through the through hole and extends into the cylinder body 21 and It is connected to the center of the right end face of the piston 19, the inner diameter of the cylinder body 21 and the diameter of the right end face of the piston 19 are both larger than the inner diameter of the through hole, and the outer circumferential surface of the piston 19 and the inner wall surface of the cylinder body 21 as well as the outer circumferential surface of the pin shaft 17 and the inner wall surface of the through hole are in sealed sliding contact, a circular oil inlet groove is provided on the outer circumferential surface of the right end of the piston 19, the oil inlet groove is connected to the left end face of the mounting plate 16, a pin extraction oil inlet 18 connected to the oil inlet groove is provided on the right end side wall of the cylinder body 21, a compression spring 20 is provided between the left end face of the piston 19 and the left end face of the cylinder body 21, and a drain port 22 is provided on the left end face of the cylinder body 21.

[0029] like Figure 3 , 4 As shown, a construction method of a self-floating submersible positioning installation device for a steel frame 1 using airbags to assist floating includes the following steps:

[0030] Step 1, install the positioning installation assembly on the steel frame 1, inflate the horizontal airbag 3 and the vertical airbag 2, place the steel frame 1 on the guide rail vehicle 5 and transport it to the semi-submersible ship 4, then tow the semi-submersible ship 4 to the installation site of the steel frame 1, and pre-tighten the steel frame 1 through four positioning ships 100. According to the layout diagram, all buoyancy devices are installed on the steel frame 1, including the horizontal airbag 3, the vertical airbag, the air pipeline, the inflation and deflation controller, the upper pull-up sling fixation, the lower pull-down sling fixation, the hydraulic unhooking device 13 and its hydraulic pipeline 12 and controller, the positioning anchor cable 6, and each airbag is inflated to reach the designed pressure, and the air pressure drop is monitored, the gas leakage fault is promptly eliminated, and the hydraulic unhooking device 13 is pre-tested to ensure smooth unhooking. Before self-floating preparation, check the pressure of each airbag or add gas; check the working status of each unhooking device; check the reliability of each airbag attachment point.

[0031] Step 2, the semi-submersible vessel 4 slowly dives, and under the buoyancy of the horizontal airbag 3 and the vertical airbag 2, the steel frame 1 is separated from the guide rail vehicle 5 and maintained in a stable floating state, and then the horizontal airbag 3 is deflated to make the steel frame 1 slowly dive; as the semi-submersible vessel 4 slowly dives, the steel frame 1 and the airbag also dive, and the airbag enters the water to generate buoyancy. As the diving depth increases, the buoyancy provided becomes larger and larger. When the buoyancy is balanced with the total weight, the steel frame 1 begins to float, and the semi-submersible vessel 4 continues to dive, then the bottom of the steel frame 1 is separated from the guide rail vehicle 5 on the semi-submersible vessel 4, so that the steel frame 1 is bent and floats freely. As the steel frame 1 floats, the positioning ships 100 at the four corners simultaneously tighten the anchor cables, and perform preliminary traction and fixation on the steel frame 1 to prevent it from drifting in a large range. When the distance between the bottom of the steel frame 1 and the guide rail vehicle 5 on the semi-submersible vessel 4 meets the safety requirements, the semi-submersible vessel 4 is moved out from the bottom of the steel frame 1, so that the steel frame 1 achieves bending and self-floating, and the positioning ship 100 ensures the fixation of its position and the stability of its posture.

[0032] Step 3, after the horizontal airbag 3 is completely deflated, the vertical airbag is deflated until the steel frame 1 continues to dive to the bottom installation position, the positioning ship 100 releases the cable in time, the hydraulic unhooking device 13 is automatically unhooked, and the horizontal airbag 3 and the vertical airbag float up for recovery. In step 3, in the process of deflation of the vertical airbag, the four groups of vertical airbags on the four corners of the steel frame 1 are deflated at the same time, and the three vertical airbags in each group of vertical airbags are deflated cyclically to ensure that the buoyancy of the steel frame 1 at the four corners remains consistent. In step 3, ballast water is added to the lumen of the steel frame 1 to increase the deadweight of the steel frame 1 and achieve the diving of the steel frame 1.

[0033] The buoyancy generated by the horizontal airbag 3 is reduced by deflating the airbag, thereby achieving the diving of the steel frame 1. The airbag should be deflated symmetrically and repeatedly to control the extent of the buoyancy reduction, thereby controlling the speed and stability of the dive. During the deflation process, the horizontal posture of the steel frame 1 should be monitored, and the deflation time and the deflated airbag should be adjusted in time. If the horizontal airbag 3 on one side is abnormal during the deflation process and cannot be closed and is always deflated, the buoyancy of the airbag on that side will be greatly lost, causing the steel frame 1 to tilt. This kind of accident should be designed with emergency measures in the following ways:

[0034] First, analyze the limit of the inclination angle of the steel frame 1 caused by the buoyancy loss of the airbag on one side. If it exceeds the value, the horizontal airbag 3 on each side should be changed from one to two to reduce the buoyancy loss, and formulate corresponding deflation rules;

[0035] Second, if there is no other plan, when the buoyancy of the horizontal airbag 3 on one side is lost, the airbag on the symmetrical side should be continuously deflated to reduce the buoyancy difference between the two symmetrical sides, thereby reducing the tilt of the steel frame 1;

[0036] If there is no other plan and the symmetrical side airbags cannot be released, the airbag side that loses buoyancy will sink, and the vertical airbags at both ends will begin to enter the water to generate buoyancy, which will reduce the buoyancy loss accordingly and reduce the degree of inclination. However, this will affect the effect of the buoyancy generated by the vertical airbags in the later stage. The inclination should be calculated and analyzed during the design.

[0037] Continue to deflate the horizontal airbag 3, the buoyancy decreases, and the steel frame 1 dives. As the depth of the steel frame 1 entering the water increases, the vertical airbags at the four corners generate buoyancy to make up for the buoyancy loss caused by the deflation of the horizontal airbag 3. In this way, the buoyancy loss of the horizontal airbag 3 is transferred to the increase in the buoyancy of the vertical airbag, thereby ensuring the overall buoyancy of the steel frame 1 and ensuring floating. At the same time, the positioning ships 100 at the four corners should retract and release the anchor cables in real time and tighten the steel frame 1 to ensure the accuracy of the positioning position of the steel frame 1. When the horizontal airbag 3 is completely deflated, the steel frame 1 dives to a certain depth as a whole and still has a floating state. In addition, it relies on the cylindrical sections of the vertical airbags on the four corners that remain on the water surface to produce better anti-tilting characteristics, a larger waterline area, and better stability.

[0038] The horizontal airbag 3 has no gas and cannot provide buoyancy. The floating of the steel frame 1 is completely transferred to the buoyancy generated by the vertical airbag. To continue to dive the steel frame 1 to the installation location, there are two ways:

[0039] First, the vertical airbags are deflated to reduce the buoyancy generated by the vertical airbags, so that the steel frame 1 dives. When the vertical airbags are deflated, the four airbag groups at the four corners should be deflated at the same time, that is, one airbag in each airbag group is deflated to ensure that the buoyancy of the remaining airbags in the group is stable, thereby reducing the risk of abnormal diving caused by excessive buoyancy loss. Each group of airbags should also be deflated in a cyclic manner to monitor the posture of the four corners in real time. At the same time, the positioning ships 100 at the four corners should track the changes in the tightness of the anchor cables in real time, and retract and release them to ensure the positioning position error of the steel frame 1.

[0040] Second, the airbags are not deflated, and ballast water is added to the tube cavity of the steel frame 1 to increase the deadweight of the steel frame 1 and achieve the diving of the steel frame 1. In this way, the control accuracy is high, and the speed and position of water addition should determine the stability of the steel frame 1, which is conducive to timely adjustment. When the steel frame 1 touches the bottom, each vertical airbag should be deflated in time, and the positioning ship 100 should release the anchor cable in time to prevent buoyancy or hull pulling the steel frame 1 to cause secondary displacement. The installation parameters should be checked after the bottom is seated.

[0041] The vertical airbag is deflated, and only a part of the air is left, which is conducive to the floating recovery of the airbag. The controller of the hydraulic unhooking device 13 is operated to unhook the hydraulic unhooking devices 13 of all airbags, so as to achieve underwater disconnection of each hanging point. After that, the airbag floats on the water surface, and the pipeline and air device are removed for recovery; other equipment is used to tow the airbag to the recovery ship for recovery.

[0042] The hydraulic unhooking device 13 uses a pin 17 to unhook. The pin 17 is connected to the lifting ring on the steel frame 1, and the lifting belt is passed through the upper lifting ear seat 14. In this way, the hydraulic unhooking device 13 connects the lifting belt and the lifting ring in series to transmit buoyancy. When it is necessary to dismantle, the hydraulic unhooking device 13 retracts the pin 17, and the pin 17 is removed from the hole of the lifting ring to achieve the removal of the lifting point. The hydraulic control pipelines between multiple hydraulic unhooking devices 13 are connected in series, and the sequential action of each unhooking device can be performed; multiple unhooking devices can also be connected in parallel to achieve simultaneous action and unhooking.

[0043] The above is only a preferred implementation of this patent. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of this patent. These improvements and substitutions should also be regarded as the scope of protection of this patent.

Claims

1. A self-floating and diving positioning installation device for a steel frame using air bags to assist buoyancy, which is arranged on the steel frame and is characterized by: At least one vertical airbag is arranged on each vertical side of the steel frame, at least one horizontal airbag is arranged on each horizontal side of the bottom of the steel frame, and a plurality of lifting rings are arranged on the steel frame, and the vertical airbag and the horizontal airbag are both connected with slings, and a hydraulic unhooking device is connected between the slings and the lifting rings, and the vertical airbag and the horizontal airbag are both provided with inflation and deflation control valves, and the inflation and deflation control valve signals are connected with a central inflation and deflation controller, and the outer sides of the four corners of the steel frame are connected with a positioning ship with a positioning anchor cable through cables; the hydraulic unhooking device includes a lifting ear seat connected with the sling, and the lifting ear seat has plywood extending downward as a whole on both sides, and a receiving groove is left between the two plywoods, and pin holes are arranged on the two plywoods, and a pin shaft that can horizontally penetrate the receiving groove and the lifting ring is movably penetrated in the pin hole, and the left side of the plywood on the left side of the lifting ear seat is connected with a mounting plate, and the left side of the mounting plate is connected with a cylindrical body that extends horizontally to the left and right and is hollow inside. The invention relates to a cylinder body, wherein a piston which can slide left and right in the cylinder body is arranged in the cylinder body, and a through hole is arranged in the center of the mounting plate, and the left end of the pin shaft extends into the cylinder body through the through hole and is connected with the center of the right end face of the piston. The inner diameter of the cylinder body and the diameter of the right end face of the piston are both larger than the inner diameter of the through hole, and the outer circumferential surface of the piston and the inner wall surface of the cylinder body as well as the outer circumferential surface of the pin shaft and the inner wall surface of the through hole are in sealed sliding contact, and an annular oil inlet groove is opened on the outer circumferential surface of the right end of the piston, and the oil inlet groove is connected with the left end face of the mounting plate, and a pin pulling oil inlet port connected with the oil inlet groove is arranged on the side wall of the right end of the cylinder body, a compression spring is arranged between the left end face of the piston and the left end face of the cylinder body, and a drainage outlet is opened on the left end face of the cylinder body; it also includes a semi-submersible vessel, and the semi-submersible vessel is provided with a guide rail vehicle which can bear a steel frame, and the bottom of the semi-submersible vessel is laid with tracks.

2. According to claim 1, the device for self-floating and submerging steel frames using air bags to assist buoyancy is characterized in that: The steel frame is square, and a vertical air bag is arranged on the outside of each right-angled vertical side and on both sides of the right-angled vertical side of the steel frame, and a horizontal air bag is arranged on each of the four horizontal sides at the bottom of the steel frame.

3. According to claim 1, the construction method of the self-floating and submerging positioning installation device for the steel frame using air bags to assist floating is characterized in that: The following steps are involved: Step 1: Install the positioning installation assembly on the steel frame, inflate the horizontal and vertical airbags, place the steel frame on the guide rail vehicle and transport it to the semi-submersible vessel, then tow the semi-submersible vessel to the installation site of the steel frame, and pre-tighten the steel frame through four positioning ships; Step 2: The semi-submersible vessel slowly dives, and under the buoyancy of the horizontal and vertical airbags, the steel frame detaches from the guide rail vehicle and remains in a stable floating state, then deflate the horizontal airbag to make the steel frame slowly dive; Step 3: After the horizontal airbag is completely deflated, The vertical airbags are deflated until the steel frame continues to dive to the bottom installation position, the positioning ship releases the cable in time, the hydraulic unhooking device automatically unhooks, and the horizontal airbags and vertical airbags float up for recovery; in step 3, during the process of deflation of the vertical airbags, the four groups of vertical airbags on the four corners of the steel frame are deflated at the same time, and the three vertical airbags in each group of vertical airbags are deflated cyclically to ensure that the buoyancy of the steel frame at the four corners remains consistent; in step 3, ballast water is added to the lumen of the steel frame to increase the deadweight of the steel frame and enable the steel frame to dive.

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