CN212388514U

CN212388514U - Self-floating and submerging positioning and mounting device for steel frame by adopting air bag floating assistance

Info

Publication number: CN212388514U
Application number: CN202021615516.4U
Authority: CN
Inventors: 赵殿华; 段青灵; 段尚言; 张永学; 韩帅师
Original assignee: Shandong Nanhai Airbag Engineering Co ltd
Current assignee: Shandong Nanhai Airbag Engineering Co ltd
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2021-01-22
Anticipated expiration: 2030-08-06

Abstract

The utility model provides an adopt gasbag to help and float and carry out from superficial dive location installation device to the steelframe, the setting is on the steelframe, be provided with at least one vertical air bag on every perpendicular limit of steelframe, be provided with at least one horizontal air bag on every horizontal limit of steelframe bottom, be provided with a plurality of rings on the steelframe, vertical air bag and horizontal air bag all are connected with the suspender, be connected with hydraulic pressure unhooking ware between suspender and the rings, vertical air bag and horizontal air bag all are provided with fills the inflation control valve, it fills the inflation control valve signal connection and has central inflation controller to fill, all be connected with the location ship of taking location anchor rope through. The utility model has the advantages that: the self-floating type ship self-floating device can directly float in a dock and then float and pull to a designated installation place, dependence on ship equipment resources is obviously reduced, construction cost is reduced, and construction period is shortened.

Description

Self-floating and submerging positioning and mounting device for steel frame by adopting air bag floating assistance

Technical Field

The utility model relates to an adopt gasbag to help floating and carry out from floating dive location installation device to the steelframe.

Background

At present, in the field of maritime work, a plurality of steel frames are arranged on a seabed to support equipment on the upper part, for example, a jacket of an ocean drilling platform is a typical steel frame for supporting an oil production module on the upper part, and the jacket is large in size, tens of meters in length and thousands of tons to ten thousands of tons in total; as a base of offshore wind power, a base steel frame is made into a supporting leg form and is installed on a seabed, and the base is complex in stress state and high in installation precision requirement; currently, in the marine product farming industry, a steel frame for bearing a plurality of farming boxes is installed in a designated marine farming area, and in order to pursue a larger farming space, the steel frame is huge in volume, but light in weight compared with a conduit pipe frame and low in installation precision. The steel frame with the structure similar to the structure meets the special requirements of various industries, and the design, manufacture, installation and future dismantling of the steel frame become professional technologies.

In the installation process of the steel frame, a floating crane installation mode is generally adopted, the steel frame is generally transported to a ship or a semi-submersible ship after being built on a building site, the steel frame is lifted by another floating crane after being transported to an installation site, then the steel frame is lowered to a seabed by a crane, and the later-stage piling and fixing operation is carried out after the steel frame is positioned. The method is a traditional construction flow method, and has the advantages of complete flow, rich construction experience and low construction risk. However, in practice, limited resources of the floating crane ship are often encountered, sometimes the construction shift period of the semi-submersible ship and the floating crane ship needs to be determined half a year or a year, and the construction period is delayed when tension or coordination is difficult, so that for a large-scale steel frame, the lifting capacity of the adopted floating crane ship is high, and the construction and ship renting cost is high.

Patent (ZL 201310363290.1) discloses a method for offshore installation of deep water jacket by using air bags, wherein a plurality of air bag sets are vertically installed on the upper part of the jacket, which can provide certain buoyancy for the deep water jacket, thus being beneficial to designing the diameter of a rod member in a wave sensitive area to the minimum value allowed in the construction of the jacket rod member, effectively reducing the environmental force borne by the jacket, fundamentally reducing the requirement on the rigidity of the jacket, and the jacket can vertically float by itself after being launched, but still needs a floating crane for hoisting and positioning in construction. In practical application, many construction schemes are discussed for installation without hoisting, so as to reduce dependence on large floating crane and reduce construction cost. Some construction projects actually adopt the air bags for assisting the floating, so that a certain buoyancy assisting effect is achieved, but the dependence on various floating cranes is not separated. In addition, in the actual adoption of the air bag for assisting the floating, some problems such as positioning are also exposed, and the impact of ocean currents on the air bag causes the steel frame to swing or shake left and right in the water, so that the crane cannot be positioned, and the positioning precision requirement of an installation place cannot be met; for example, the problem that the buoyancy fixing point of the air bag is difficult to remove is that a diver needs to dive for manual removal, the required removal operation time is long due to the fact that a plurality of hanging points are provided, and the underwater robot is adopted in a deep water area, so that higher equipment use cost is generated, the construction cost is saved in floating crane lease, and much expense is caused in removal.

Disclosure of Invention

For the not enough in the technique above solving, the utility model provides an adopt gasbag to help and float and carry out from superficial dive location installation device to the steelframe, need not lift by crane the steelframe, practiced thrift construction equipment, reduced construction cost.

The utility model discloses a realize through following measure:

the utility model provides an adopt gasbag to help floating and carry out from superficial dive location installation device to steelframe, sets up on the steelframe, be provided with at least one vertical air bag on every perpendicular limit of steelframe, be provided with at least one horizontal air bag on every horizontal limit of steelframe bottom, be provided with a plurality of rings on the steelframe, vertical air bag and horizontal air bag all are connected with the suspender, be connected with hydraulic pressure unhooking ware between suspender and the rings, vertical air bag and horizontal air bag all are provided with fills the gassing control valve, fill gassing control valve signal connection with central authorities and fill the gassing controller, all are connected with the location ship of taking location anchor rope through the hawser in four angle outsides.

The hydraulic detacher comprises a lifting lug seat connected with a lifting strap, wherein the left side and the right side of the lifting lug seat are respectively extended downwards to form a whole body with a clamping plate, a holding tank is reserved between the two clamping plates, pin holes are respectively arranged on the two clamping plates, pin shafts capable of transversely penetrating the holding tank and the lifting ring are movably penetrated in the pin holes, the left side of the clamping plate on the left side of the lifting lug seat is connected with a mounting disc, the left side of the mounting disc is connected with a cylindrical cylinder body which transversely extends left and right and is hollow inside, a piston capable of sliding left and right in the cylinder body is arranged in the cylinder body, a through hole is arranged in the center of the mounting disc, the left end of the pin shaft penetrates through the through hole to extend into the cylinder body 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, the cylinder is characterized in that an annular oil inlet groove is formed in the outer circumferential surface of the right end of the piston, the oil inlet groove is communicated with the left end face of the mounting plate, a pin pulling oil inlet communicated with the oil inlet groove is formed in 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 water outlet is formed in the left end face of the cylinder body.

The utility model discloses still include semi-submerged ship, be provided with the guide rail car that can bear the weight of the steelframe on the semi-submerged ship, laid the track bottom the semi-submerged ship.

The steel frame is square, the outer side of each right-angle vertical edge of the steel frame and the two sides of each right-angle vertical edge of the steel frame are respectively provided with a vertical air bag, and four transverse edges of the bottom of the steel frame are respectively provided with a horizontal air bag.

The utility model has the advantages that: 1. the steel frame is positioned by the anchor ship in a self-floating way without adopting a floating crane ship, and the automatic dismantling of each hanging point is realized by adopting a hydraulic unhooking device. In the self-floating and submerging processes of the steel frame, floating crane ships are not adopted; 2. In the process from the self-floating of the steel frame to the completion of installation and positioning, a plurality of anchor boats are adopted for traction and positioning, and the steel frame is tensioned by the cooperation of a plurality of machines, so that the impact and flapping influence of ocean current and ocean waves on the steel frame is eliminated, the offset and the shaking are reduced, and the positioning error is reduced; 3. the hydraulic unhooking device is adopted to realize automatic dismantling of each hanging point, the action process is short, the dismantling time is shortened, a diver does not need to launch for underwater dismantling, the labor amount and the accidental risk of underwater operation are reduced, the hydraulic unhooking devices with different structures are designed to meet the underwater unhooking in a deep water area, the dependence on an underwater robot is reduced, the construction cost is reduced, and the construction period is shortened; 4. the various airbags, pipelines, controllers, hydraulic decouplers and the like can be repeatedly used, the airbags with different structures and weight steel frames can be arranged and the buoyancy can be provided by combining according to needs, the whole set of device is expected to be repeatedly used for more than 5 times or within 3 years, the cost share of construction cost at each time is obviously reduced, the maintenance is convenient, and the cost is low. 5. When the steel frame is built in the dock, the steel frame can be directly floated in the dock and then floated and pulled to a specified installation place, a semi-submersible ship and a floating crane are not needed in the whole process, only a tugboat and a positioning boat are needed, the dependence on ship equipment resources is obviously reduced, the construction cost is reduced, and the construction period is shortened.

Drawings

Fig. 1 is a schematic view of the structure of the present invention.

Fig. 2 is a schematic top view of the positioning boat in a pulling state according to the present invention.

Fig. 3 is a schematic structural view of the steel frame sinking state of the present invention.

Fig. 4 is the structure diagram of the steel frame after the installation.

Fig. 5 is a schematic structural view of the hydraulic detacher of the present invention.

Wherein: the device comprises a steel frame 1, a vertical air bag 2, a horizontal air bag 3, a semi-submersible ship 4, a guide rail vehicle 5, a positioning anchor cable 6, an air pipe 7, a centralized control end 8, a central inflation and deflation controller 9, a detacher hydraulic controller 11, a hydraulic pipeline 12, a hydraulic detacher 13, a lifting lug seat 14, a clamping plate 15, a mounting disc 16, a pin shaft 17, a pin pulling oil inlet 18, a piston 19, a compression spring 20, a cylinder body 21, a water outlet 22, a positioning ship 100, a winch 101 and a ship anchor 102.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

as shown in fig. 1, 2 and 5, the installation device for self-floating and submerging positioning of a steel frame by using air bag assisted floating is arranged on the steel frame 1, at least one vertical air bag 2 is arranged on each vertical edge of the steel frame 1, at least one horizontal air bag 3 is arranged on each horizontal edge of the bottom of the steel frame 1, a plurality of hanging rings are arranged on the steel frame 1, the vertical air bags 2 and the horizontal air bags 3 are both connected with hanging belts, hydraulic unhooking devices are connected between the hanging belts and the hanging rings, the vertical air bags 2 and the horizontal air bags 3 are both provided with inflation and deflation control valves, the inflation and deflation control valves are in signal connection with a central inflation and deflation controller, and positioning boats 100 with positioning anchor cables are connected to the outer sides. The head of the horizontal air bag 3 is inclined to pull the hanging strip, so that the air bag is prevented from swinging left and right when being deflated, and the position deviation of a floating center generated by buoyancy is influenced. The semi-submersible vessel 4 is responsible for transporting the steel frame 1 from the construction site to the installation site. The guide rail vehicle 5 supports the steel frame 1 for supporting, and the guide rail vehicle 5 can roll on a guide rail of the semi-submersible vessel 4 and is a sliding supporting and transporting device for transferring the steel frame 1 to the semi-submersible vessel 4. When the steel frame 1 is submerged and positioned, the steel frame 1 is installed and positioned in a mode that the positioning anchor cables 6 are tensioned by the positioning ship 100. The air pipe 7 is connected with each air bag and the centralized control end 8, and the centralized control end 8 is used for inflating and deflating the air bags and detecting the pressure. The hydraulic detacher controller 11 controls each hydraulic detacher 13 to realize the detaching action; a hydraulic line 12 is connected between the detacher hydraulic controller 11 and the hydraulic detacher 13. In order to improve steady orientation, the utility model discloses still set up semi-submerged ship 4, set up the guide rail car 5 that can bear the steelframe on the semi-submerged ship 4, laid the track bottom the semi-submerged ship 4. Steelframe 1 is square, and every right angle of steelframe 1 erects the limit outside and the both sides on right angle perpendicular limit all set up a vertical gasbag 2, and four horizontal limits of 1 bottoms of steelframe set up a horizontal gasbag 3 respectively.

The central inflation and deflation controller 9 controls the four terminal controllers, thereby realizing inflation and deflation of each air bag, pressure detection and recording and the like. Four corners of the positioning ship 100 are symmetrically positioned, and the winch 101 on the positioning ship 100 winds and unwinds the cable to tension and loosen the steel frame 1, so that the four positioning ships 100 coordinately wind and unwind the positioning anchor cable 6, deflection and shaking caused by impact of ocean current on the steel frame 1 and an air bag are reduced, and the steel frame 1 is positioned; the anchor 102 of the positioning vessel 100 serves to fix the positioning vessel 100.

The hydraulic detacher 13 comprises a lifting lug seat 14 connected with a lifting strap, clamping plates 15 are integrally extended downwards on the left side and the right side of the lifting lug seat 14, an accommodating groove is reserved between the two clamping plates 15, pin holes are arranged on the two clamping plates 15, pin shafts 17 capable of transversely penetrating through the accommodating groove are movably penetrated in the pin holes, the pin shafts 17 can penetrate through the lifting ring, a mounting disc 16 is connected to the left side of the clamping plate 15 on the left side of the lifting lug seat 14, a cylindrical cylinder body 21 which is transversely extended leftwards and rightwards and is hollow is connected to the left side of the mounting disc 16, a piston 19 capable of sliding leftwards and rightwards in the cylinder body 21 is arranged in the cylinder body 21, a through hole is arranged in the center of the mounting disc 16, the left end of the pin shaft 17 penetrates through the through hole to extend into the cylinder body 21 and is connected with 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, an annular oil inlet groove is formed in the outer circumferential surface of the right end portion of the piston 19, the oil inlet groove is communicated with the left end face of the mounting disc 16, a pin pulling oil inlet 18 communicated with the oil inlet groove is formed in the side wall of the right end of the cylinder body 21, a compression spring 20 is arranged between the left end face of the piston 19 and the left end face of the inside of the cylinder body 21, and a water outlet 22 is formed in the left end face of the cylinder body 21.

As shown in fig. 3 and 4, a construction method for carrying out self-floating and submerging positioning and installation on a steel frame 1 by using air bag assisted floating comprises the following steps:

step 1, installing the positioning and installing assembly on a steel frame 1, inflating a horizontal air bag 3 and a vertical air bag 2, placing the steel frame 1 on a guide rail vehicle 5 and transporting the steel frame 1 to a semi-submersible vessel 4, then towing the semi-submersible vessel 4 to the installation site of the steel frame 1, and pre-tensioning the steel frame 1 through four positioning vessels 100. All the buoyancy devices are installed on the steel frame 1 according to the layout, and comprise a horizontal air bag 3, a vertical air bag, an air pipeline, an inflation and deflation controller, a pull-up hanging strip and a pull-down hanging strip, the hydraulic detacher 13, a hydraulic pipeline 12 and a controller are installed, a positioning anchor cable 6 is installed, each air bag is inflated, designed pressure is achieved, the pressure drop condition of air pressure is monitored, the leakage gas fault is timely eliminated, the hydraulic detacher 13 is subjected to a pre-test, and the unhooking action is guaranteed to be smooth. Before the self-floating preparation, checking the pressure of each air bag or supplementing air; checking the working state of each detacher; the reliability of each of the suspension points of the airbag was checked.

Step 2, slowly submerging the semi-submerged ship 4, separating the steel frame 1 from the guide rail vehicle 5 and keeping the steel frame in a stable floating state under the buoyancy action of the horizontal air bags 3 and the vertical air bags 2, and then deflating the horizontal air bags 3 to slowly submerge the steel frame 1; along with the slow dive of semi-submerged ship 4, steelframe 1 and gasbag also dive, the gasbag is gone into water and is produced buoyancy, along with dive degree of depth increase, the buoyancy that provides is bigger and bigger, and when buoyancy and total weight were balanced, steelframe 1 began to float, and semi-submerged ship 4 continues to dive, then the guide rail car 5 on steelframe 1 bottom breaks away from semi-submerged ship 4 to steelframe 1 bending free floating. Along with the showy of steelframe 1, the anchor rope of the positioning ship 100 of four corners is tightened up simultaneously, carries out preliminary traction to steelframe 1 and fixes, prevents that it from drifting on a large scale. 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 requirement, the semi-submersible vessel 4 is moved out from the bottom of the steel frame 1, so that the steel frame 1 is bent and self-floats, and the positioning vessel 100 ensures the fixation of the position and the stability of the posture.

And 3, after the horizontal air bag 3 is completely deflated, deflating the vertical air bag until the steel frame 1 continues to submerge to the bottom installation position, timely loosening the mooring rope by the positioning ship 100, automatically unhooking by the hydraulic unhooking device 13, and floating and recovering the horizontal air bag 3 and the vertical air bag. In step 3, in the process of deflating the vertical air bags, four groups of vertical air bags on four corners of the steel frame 1 are deflated simultaneously, and three vertical air bags of each group of vertical air bags are deflated circularly so as to ensure that the buoyancy of the steel frame 1 on four corners is kept consistent. In step 3, ballast water is filled into the tube cavity of the steel frame 1, the dead weight of the steel frame 1 is increased, and the steel frame 1 is submerged.

The operation of deflating the horizontal air bags 3 is adopted to reduce the buoyancy generated by the air bags, so that the steel frame 1 is submerged. The air-pocket is deflated by adopting the operation of symmetric circulation and repeated deflation, and the reduction amplitude of the buoyancy is controlled, thereby controlling the submerging speed and stability. The horizontal posture of the steel frame 1 should be monitored during the deflation process, and the deflation time and the deflated air bag should be adjusted in time. If the horizontal air bag 3 on one side is abnormal in the air discharging process and cannot be closed to discharge air all the time, the buoyancy of the air bag on the side is greatly lost, the steel frame 1 can be inclined, and the accident should be made into emergency measures in the following mode:

firstly, analyzing the limit condition of the inclination angle of the steel frame 1 caused by buoyancy loss of the air bag at one side, if the limit condition exceeds the value, changing one horizontal air bag 3 at each side into two horizontal air bags, reducing the buoyancy loss, and making a corresponding deflation rule;

secondly, if no other plan exists, when the buoyancy of the horizontal air bag 3 on one side is lost, the air bags on the symmetrical sides are required to be continuously deflated, so that the buoyancy difference generated on the symmetrical sides is reduced, and the inclination condition of the steel frame 1 is reduced;

if the air of the symmetrical side air bags can not be put again without other plans, the air bag side losing the buoyancy can sink, the vertical air bags at the two ends of the air bag start to enter water to generate the buoyancy, the buoyancy loss is correspondingly reduced, the inclination degree of the air bag is reduced to some extent, and the effect of the buoyancy generated by the vertical air bags at the later stage can be influenced. The inclination condition should be calculated and analyzed during design.

The horizontal air bags 3 are deflated continuously, the buoyancy is reduced, the steel frame 1 submerges, the vertical air bags at the four corners generate buoyancy along with the increase of the depth of the steel frame 1 entering the water, so that the buoyancy loss caused by deflation of the horizontal air bags 3 is filled, and the buoyancy loss of the horizontal air bags 3 is transferred to the increase of the buoyancy of the vertical air bags, so that the integral buoyancy state of the steel frame 1 is ensured, and the floating is ensured; meanwhile, the anchor cables of the positioning ships 100 at four corners are required to be retracted and extended in real time, and the steel frame 1 is tensioned, so that the positioning position accuracy of the steel frame 1 is ensured. After horizontal gasbag 3 completely deflated, steelframe 1 is whole to dive certain degree of depth, still has the floating state, and its cylinder section on relying on the vertical gasbag surplus surface of water in four corners can produce better anti slope characteristic moreover, and the waterline area is bigger, and its stationarity is better.

The horizontal air bags 3 are not inflated and cannot provide buoyancy, and the floating of the steel frame 1 is completely transferred to the buoyancy generated by the vertical air bags. To continue to submerge the steel frame 1 to the installation position, there are two methods:

firstly, the operation of deflating the vertical air bags is adopted, so that the buoyancy generated by the vertical air bags is reduced, and the steel frame 1 is submerged. When deflating the vertical air bag, the mode of deflating the four air bag groups at the four corners simultaneously is adopted, namely, one air bag of each air bag group is deflated, so that the buoyancy stability of the rest air bags of the group is ensured, and the risk of abnormal diving caused by the too fast buoyancy loss is reduced. The air bags in each group also adopt a circulating deflation mode to monitor the postures of the four corners in real time. Meanwhile, the positioning ships 100 at the four corners should track the tightness change of the anchor cables in real time to retract and release the anchor cables, so that the positioning position error of the steel frame 1 is ensured.

Secondly, not deflating the gasbag, adopting the mode of filling ballast water into the lumen of steelframe 1, increasing steelframe 1 dead weight, realizing that steelframe 1 dives, adopting this kind of mode, control accuracy is high, should add water speed and position and decide the stability gesture of steelframe 1, is favorable to in time adjusting. When the steel frame 1 is in contact with the bottom, each vertical air bag needs to be deflated in time, and the anchor cables of the positioning ship 100 need to be loosened in time to prevent the buoyancy or the secondary displacement generated when the ship body pulls the steel frame 1. The mounting parameters should be checked after the seat bottom.

The vertical air bag is deflated, and only a part of air is left, so that the air bag is favorable for floating recovery. The controller of the hydraulic detacher 13 is operated to perform the detaching action on the hydraulic detachers 13 of all the airbags, thereby realizing the underwater disconnection of each hanging point. Then the air bag floats on the water surface, the pipeline and the air device are dismantled and recovered; and (4) dragging the air bag to a recovery ship by adopting other equipment for recovery.

The hydraulic detacher 13 is detached by adopting a pin shaft 17, the pin shaft 17 is connected with a lifting ring on the steel frame 1, and the lifting belt passes through the lifting lug seat 14 on the upper part, so that the hydraulic detacher 13 can transfer buoyancy by connecting the lifting belt and the lifting ring in series. When the lifting point needs to be removed, the hydraulic detacher 13 retracts the pin shaft 17, and the pin shaft 17 is separated from the hole of the lifting ring, so that the lifting point is removed. The hydraulic control pipelines among the plurality of hydraulic detachers 13 are connected in series, and can sequentially act one by one; and a mode of connecting a plurality of unhooking devices in parallel can also be adopted, so that simultaneous action and unhooking are realized.

The foregoing is only a preferred embodiment of this patent, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of this patent, and these modifications and substitutions should also be regarded as the protection scope of this patent.

Claims

1. The utility model provides an adopt gasbag to help floating and carry out from superficial dive location installation device to the steelframe, sets up on the steelframe, its characterized in that: every of the vertical edges of the steel frame is provided with at least one vertical air bag, every transverse edge of the bottom of the steel frame is provided with at least one horizontal air bag, the steel frame is provided with a plurality of lifting rings, the vertical air bags and the horizontal air bags are connected with lifting belts, a hydraulic unhooking device is connected between the lifting belts and the lifting rings, the vertical air bags and the horizontal air bags are provided with inflation and deflation control valves, the inflation and deflation control valves are in signal connection with a central inflation and deflation controller, and the outer sides of the four corners of the steel frame are connected with a positioning boat with positioning anchor cables through cables.

2. The device for self-floating and submerging positioning and installation of a steel frame by adopting air bag assisted floating is characterized in that: the hydraulic detacher comprises a lifting lug seat connected with a lifting strap, wherein the left side and the right side of the lifting lug seat are respectively extended downwards to form a whole body with a clamping plate, a holding tank is reserved between the two clamping plates, a pin hole is respectively arranged on the two clamping plates, a pin shaft capable of transversely penetrating through the holding tank and a lifting ring is movably arranged in the pin hole, the left side of the clamping plate on the left side of the lifting lug seat is connected with a mounting disc, the left side of the mounting disc is connected with a cylindrical cylinder body which transversely extends left and right and is hollow inside, a piston capable of sliding left and right in the cylinder body is arranged in the cylinder body, a through hole is arranged in the center of the mounting disc, the left end of the pin shaft penetrates through the through hole to extend into the cylinder body and is connected with the center of the right end face of the piston, the inner diameter of the cylinder body and the right end face of the piston are, the cylinder is characterized in that an annular oil inlet groove is formed in the outer circumferential surface of the right end of the piston, the oil inlet groove is communicated with the left end face of the mounting plate, a pin pulling oil inlet communicated with the oil inlet groove is formed in 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 water outlet is formed in the left end face of the cylinder body.

3. The device for self-floating and submerging positioning and installation of a steel frame by adopting air bag assisted floating is characterized in that: the semi-submersible vehicle is characterized by further comprising a semi-submersible ship, wherein a guide rail vehicle capable of bearing a steel frame is arranged on the semi-submersible ship, and a track is laid at the bottom of the semi-submersible ship.

4. The device for self-floating and submerging positioning and installation of a steel frame by adopting air bag assisted floating is characterized in that: the steelframe is square, and every right angle of steelframe erects the limit outside and the both sides that the right angle erects the limit all set up a vertical gasbag, and four horizontal limits of steelframe bottom set up a horizontal gasbag respectively.