CN110883500A - Factory modularized prefabricated floating roof and field installation method thereof - Google Patents

Abstract

The present invention discloses a method for assembling a factory modular prefabricated floating roof, which is to divide the floating roof into multiple modules, prefabricate each module in the factory, and then transport it to a storage tank, and weld and install multiple modules and components on site according to the structure of the floating roof to form a factory modular prefabricated floating roof. The present invention greatly reduces the intensity and time of on-site work, improves the efficiency of the installation of the floating roof, and uses a method of opening a notch in the tank wall or tank top as an installation channel to install the floating roof, which is convenient for workers to perform assembly, welding and inspection operations.

Description

A factory modular prefabricated floating roof and its on-site installation method

technical field

The invention relates to the field of floating roofs, in particular to a factory modular prefabricated floating roof and an on-site installation method thereof.

Background technique

At present, the external floating roof of the storage tank is a single-disc or double-disc steel floating roof welded on site. All are prefabricated, welded and painted on site. The construction period is long; the construction conditions are poor, and it is easily affected by weather and season conditions, and the construction quality is difficult to guarantee; the space in the floating cabin is narrow, and major safety accidents are easily caused when welding and painting operations are carried out in the narrow space; 2006 At around 19:20 on October 28, 2019, an explosion occurred during the painting construction of the floating roof of a 100,000 m3 crude oil storage tank under construction in Dushanzi, Xinjiang, resulting in 12 deaths and 12 injuries.

At present, the main types of floating roofs in storage tanks are: (1) Single-disk or double-disk steel floating roofs welded on site. (2) Assembled internal floating roofs, including pontoon-type internal floating roofs, honeycomb-type internal floating roofs, box-type internal floating roofs, etc.: The common characteristics of fabricated internal floating roofs are: prefabricated parts in the factory, through the tank wall DN600 The parts are transported into the storage tank through the manhole, assembled in the storage tank, and the parts are connected and fixed by bolts, adhesives, etc. The main disadvantages are: the skins are very narrow due to the access from the DN600 manhole, there are many joints between the skins, the joints connected by bolts and adhesives are unreliable, and people are on the floating roof. Disturbances during walking or raising and lowering of the floating roof can cause leakage at the joints. This will lead to an increase in VOC emissions; there is a gas phase space between the skin and the liquid surface, which is a safety hazard and will also cause an increase in VOC emissions; the volatile gas in the gas phase space between the inner floating roof and the tank top will condense. When a fire occurs, the skin will be deformed due to heat, the adhesive will fail due to heat, the joints between the skins will be cracked, and the oil and gas will overflow from the cracks. and intensified the fire.

From July 19th to 20th, 2016, the Standard and Quota Division of the Ministry of Housing and Urban-Rural Development organized a national standard coordination meeting for the petroleum and petrochemical industry in Beijing. Relevant leaders of the Fire Department of the Ministry of Public Security, the State Administration of Work Safety, and the National Energy Administration, the responsible comrades in charge of standardization work of China Petrochemical Corporation and China National Petroleum Corporation, the public security fire brigade of Liaoning, Shandong, Jiangsu, etc., the Tianjin Ministry of Public Security Relevant experts from the Fire Research Institute and the Fire Detachment of PetroChina Lanzhou Petrochemical Company, as well as the national standards "Code for Design of Petroleum Reserves", "Code for Design of Petroleum Depots", "Code for Design of Petroleum and Natural Gas Engineering", "Code for Design of Petrochemical Enterprises"","Code for Design of Fire Dikes in Tank Areas" and other code preparation team members attended the meeting. The meeting studied and analyzed the causes and lessons of major petroleum and petrochemical explosion fire accidents in China, and demonstrated the importance and necessity of improving the fortification standards of petroleum and petrochemical enterprises. ”, “Code for Design of Fire Protection for Petrochemical Enterprises”, “Code for Design of Petroleum Depots”, “Code for Design of Petroleum Storage Depots”, “Code for Design of Fire Dikes for Storage Tank Areas”, etc. The requirements of paragraph 1 of Article 7 are as follows: "A storage tank for storing liquids with a flash point lower than 45 °C, when the capacity of a single tank is greater than 5000m3, a single ^- pan or double-pan inner floating roof or external floating roof storage tank shall be used, and shall not be used. Use light-weight floating-pan inner floating-roof tanks (including stainless steel combined floating-pans); when the capacity of a single tank is less than or equal to 5000m3, aluminum pontoon ^- type inner floating-roof storage tanks can be used, but a nitrogen sealing protection system should be installed. For oil depots without nitrogen supply conditions, measures can be taken to monitor the concentration of oil and gas and prevent the concentration of oil and gas from reaching the lower explosion limit of 50%. When the storage capacity of a single tank is greater than or equal to 50,000m3, a steel double ^- disc storage tank should be used. The material of the floating plate should be comprehensive Carbon steel, low alloy steel or austenitic stainless steel are selected for strength requirements and storage corrosion.” The main purpose of the above-mentioned coordination meeting is to require the five major standards editorial committees to modify the relevant content according to the meeting minutes of the coordination meeting when the next standard is upgraded. That is, the use of the assembled floating plate in the oil tank above 5000m ³ is prohibited, and the use of the oil tank below 5000m ³ is conditional.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a factory modular prefabricated floating roof and an on-site installation method thereof, which greatly reduces the on-site work intensity and working time, and improves the installation work efficiency of the floating roof.

The technical scheme of the present invention is:

An assembly method of a factory modular prefabricated floating roof is to divide the floating roof into multiple modules, prefabricate each module in the factory, and then transport it into a storage tank, and perform on-site assembly welding of multiple modules and components according to the structure of the floating roof. and installed to form a factory modular prefabricated floating roof.

A method for assembling a factory modular prefabricated floating roof, which specifically includes the following steps:

(1) Tank wall cutting: Select a tank wall plate. The cutting width of this tank wall plate is determined by the maximum size of the single floating roof and the component. There is no opening on the tank wall plate, and the location is convenient for the transportation of the single floating cabin and the component. The cutting seam at the bottom end of the tank wall plate is located at the welding seam between the bottom ring of the tank wall and the edge plate of the tank bottom, and the cutting seam at the top end of the tank wall plate is located between the annular tank wall where the tank wall plate is located and the adjacent upper annular tank wall At the welding seam between, the tank wall plate includes two longitudinal cutting seams, the two upper longitudinal welding seams with the shortest horizontal distance from the two longitudinal cutting seams of the tank wall plate on the adjacent upper annular tank wall, and the distance between the tank bottom edge plate and the tank bottom edge plate. The two lower longitudinal welds with the shortest horizontal distance between the two longitudinal cutting seams of the tank wall plate, the horizontal distance between the two upper longitudinal welding seams and the corresponding longitudinal cutting seam of the tank wall plate is greater than or equal to 500mm, and the two lower longitudinal welding seams are respectively greater than or equal to 500mm. The horizontal distance between the longitudinal welding seam and the corresponding longitudinal cutting seam of the tank wall plate is greater than or equal to 500mm, and the two longitudinal cutting seams of the tank wall plate are located at the longitudinal welding seam on the annular tank wall or between the longitudinal welding seam and the nearest longitudinal welding seam. The horizontal distance is greater than or equal to 1200mm;

(2) Installation of profiled steel gantry: Connect the profiled steel gantry of the inverted U-shaped structure to the cutting hole of the tank wall plate, the horizontal part of the top of the profiled steel gantry is connected and fixed with the adjacent upper annular tank wall, and the profiled steel gantry is two vertical. The straight part is connected and fixed with the two longitudinal slits on the storage tank respectively; and the horizontal part of the top of the profiled steel gantry and the adjacent upper annular tank wall, the two vertical parts of the profiled steel gantry and the two longitudinal slits of the tank wall respectively between them are fixed by reinforcing ribs;

(3) Transportation and installation: transport the factory-prefabricated single floating cabins and components of multiple modular structures into the storage tank from the cutting holes of the tank wall, and then transport multiple single floating cabins with modular structures according to the structure. The connection plate is welded and fixed or the top plate and the bottom plate are directly welded and fixed; after the modular prefabrication of the multiple modular structures, the kerosene penetration test and the compressed air tightness test are required;

(4) Connect the vacuum pump to the pipe joint, and carry out the vacuum tightness test. The test negative pressure value of the vacuum test shall not be lower than 53kPa, and the holding time shall be 5 minutes. It is qualified if there is no leakage; then connect the pipe joint to the compressor, The tightness test is carried out for each single floating cabin with 1180Pa of compressed air inflated, the pressure stabilization time is not less than 5 minutes, and no leakage is qualified; when the above tests are all unqualified, 785Pa compressed air is blown into each single floating cabin. , Use soap solution to detect the leak point, when the leak point is found first, repair the welding and repeat the above leak detection test until it is qualified;

(5) After passing the inspection, the newly added welds and the damaged parts of the paint film shall be repainted with anti-corrosion coating;

(6) After the floating roof installation inspection is qualified, carry out lifting test and hydraulic test;

(7) Installation of the tank wall: Install the cut tank wall plate or the tank wall plate of the same material and specification as the cut tank wall plate to the cutting hole of the storage tank. Before welding the longitudinal weld of the tank wall plate, cut and open the tank. The two upper annular welds between the wall bottom ring and the tank bottom edge plate, cut the two lower annular welds between the annular tank wall where the tank wall plate is located and the adjacent upper annular tank wall, and the two upper annular welds. The inner ends of the seams are respectively located at the top of the two longitudinal slits of the tank wall, the inner ends of the two lower annular welds are respectively located at the bottom ends of the two longitudinal slits of the tank wall, and the two upper annular welds and the two lower annular welds. After the seam cutting is completed, then weld the longitudinal weld of the tank wall plate, and finally weld the circumferential weld of the tank wall plate, the two upper annular welds and the two lower annular welds.

When the storage tank is a new storage tank, when the new storage tank is being installed, after the installation of the tank bottom plate is completed, the factory prefabricated single floating cabins and components of multiple modular structures are transported to the tank bottom plate, and then floated. On-site assembly welding, installation and inspection of the roof.

When the multiple modules mentioned are of single floating cabin structure, each single floating cabin is made by factory modular prefabrication welding of the top plate, bottom plate and peripheral side plate, and the following three welding methods are selected between adjacent single floating cabins One or more of the fixed structures shall be welded and fixed, and the top plates or bottom plates of adjacent single floating cabins shall be welded and fixed by connecting plate lap welding, and the top plate of one single floating cabin shall be directly connected to the top plate of the other single floating cabin. The upper and lower layers are lap welded and fixed, and the upper and lower layers are directly lap welded and fixed between the bottom plate of one single floating cabin and the bottom plate of the other single floating cabin. In the case of one or two single floating cabins, according to the actual installation size, adjust the length of the top plate and bottom plate in the last one or two single floating cabins, that is, adjust the length of the lap welding part on the top plate and bottom plate; When the floating cabin is a single-layer steel plate, the upper and lower layers of adjacent single-layer steel plates are lap welded or the ends of the two adjacent single-layer steel plates are aligned and welded, and a T-shape is welded directly below the welding point of the two adjacent single-layer steel plates. The section steel, that is, the horizontal part of the T-shaped section steel is welded and fixed with the lower end faces of the two adjacent single-layer steel plates, and the welding port is closed.

The single floating cabin located at the central position of the floating roof is provided with a drain funnel at the central position, the top of the drain funnel is fixedly connected with the top plate of the single floating cabin, and a drain pipe is arranged at the bottom plate of the single floating cabin. The drainage funnel extends into the single floating cabin and is connected with the top of the drainage pipe, and the bottom of the drainage pipe extends out of the single floating cabin; two L-shaped seals are arranged in each single floating cabin. Plate, the end of the vertical part of the sealing plate is welded and fixed with the lower end surface of the top plate, the end of the horizontal part of the sealing plate is welded and fixed with the two opposite inner sides of the peripheral side plates, and the two L-shaped sides of the sealing plate are respectively connected with the single floating cabin. The other two opposite inner sides of the peripheral side plates are welded and fixed; the bottom plate of each single floating tank is provided with a drain port. When the single floating tank leaks, the drain port will leak into the single floating tank. The medium in the tank is discharged.

The bottom plate and the peripheral side plate of the single floating cabin are of an integrated bending structure, and the welding part at the top of the peripheral side plate is welded and fixed with the top plate. When the two adjacent single floating cabins are welded and fixed, the The bottom plate is flat and fixed by welding through the lower connecting plate, the peripheral side plates of the two single floating cabins are closely attached, and the top plates of the two single floating cabins are flat and fixed by welding through the upper connecting plate.

The bottom plate and the peripheral side plates of the single floating cabin are integrated bending structures, and the three adjacent single floating cabins include two first floating cabins and one second floating cabin located on both sides or Two second pontoons on both sides and one first pontoon, the top ends of the peripheral side plates of the first pontoon are welded to the lower end face of the corresponding top plate, and the top plate of the first pontoon includes a horizontal plane toward the adjacent second pontoon. The extended upper extension part and the horizontal welding part of the top of the peripheral side plate of the second floating cabin are welded and fixed with the corresponding top plate. When the adjacent first floating cabin and the second floating cabin are welded and fixed, the first floating cabin and the second floating cabin are welded and fixed. The peripheral side panels of the tank are closely attached, the bottom plate of the first floating tank and the bottom plate of the second floating tank are flat and fixed by welding through the lower connecting plate, and the upper extension of the top plate of the first floating tank is placed directly above the top plate of the second floating tank And the two are welded and fixed.

Among the plurality of single floating cabins, the adjacent three single floating cabins include two third floating cabins and one fourth floating cabin on both sides or two fourth floating cabins on both sides respectively. and a third floating tank, the bottom end of the peripheral side plate of the third floating tank is welded and fixed to the upper end surface of the corresponding bottom plate, the top end of the peripheral side plate of the third floating tank is welded and fixed to the lower end surface of the corresponding top plate, and the top plate of the third floating tank is welded and fixed. It includes an upper extension that extends horizontally to the adjacent fourth pontoon, the bottom plate of the third pontoon includes a lower extension that extends horizontally to the adjacent fourth pontoon, and the bottom plate of the fourth pontoon and the peripheral side plate are integrated The bending structure is adopted. The horizontal welding part of the top of the peripheral side plate of the fourth floating cabin is welded and fixed with the corresponding top plate. When the third floating cabin and the fourth floating cabin are welded and fixed, the peripheral sides of the third floating cabin and the fourth floating cabin are welded and fixed. The plates are closely attached, the upper extension of the third pontoon top plate is placed directly above the fourth pontoon roof and the two are welded and fixed, and the lower extension of the third pontoon bottom plate is located directly below the fourth pontoon bottom plate and the two are fixed. fixed by welding.

Among the plurality of single floating cabins, the adjacent three single floating cabins include two fifth floating cabins and one sixth floating cabin respectively located on both sides or two fifth floating cabins respectively located on both sides. and a sixth pontoon, the bottom plate and the peripheral side plate of the fifth pontoon are integral bending structures, the top of the peripheral side plate of the fifth pontoon is welded and fixed with the lower end face of the corresponding top plate, and the top plate of the fifth pontoon includes There is an upper extension extending horizontally toward the adjacent sixth pontoon, the horizontal welding portion of the top of the peripheral side plate of the sixth pontoon is welded and fixed with the corresponding top plate, and the bottom end of the peripheral side plate of the sixth pontoon is all connected with the corresponding bottom plate. The upper end surface is welded and fixed, and the bottom plate of the sixth floating cabin includes a lower extension extending horizontally to the adjacent fifth floating cabin. When the fifth floating cabin and the sixth floating cabin are welded and fixed, the fifth floating cabin and the sixth floating cabin The peripheral side plates are closely fitted, the upper extension of the roof of the fifth pontoon is placed directly above the roof of the sixth pontoon and the two are welded and fixed, and the bottom plate of the fifth pontoon is placed directly above the extension of the bottom of the sixth pontoon. Above and both are welded and fixed.

In the welding and fixing structure of the adjacent single pontoon, the single-layer steel plate on the top plate, the connecting plate used for the top plate connection, the top plate of the overlapping upper layer and located on the overlapping part, and the overlapping upper layer. A pipe joint extending to the outside of the single floating cabin is connected to the single-layer steel plate located at the lap joint or directly above the T-shaped steel.

Advantages of the present invention:

(1) The original on-site floating roof installation time is about 45 days. The single floating cabin with pre-installed modular structure is used for direct assembly. The time is only 5 days, which saves about 89% of the time and greatly reduces the on-site work. intensity and working hours;

(2) During the on-site construction of the old floating roof, conditions such as wind speed, temperature, humidity, rain and snow will greatly affect the construction quality and efficiency; and the structure and method of the present invention avoid these shortcomings, and are not affected by the on-site construction site, construction Due to the limitations of machine conditions, advanced and large-scale cutting, welding, forming, and painting equipment can be used for factory modular prefabrication. Modular production makes a qualitative leap in production efficiency and manufacturing quality;

(3) The factory modular prefabricated single floating cabin of the present invention does not require construction personnel to drill into the narrow floating cabin for construction, and can be derusted, painted, dried, and inspected in a dedicated painting workshop, and the painting quality and efficiency Greatly improve;

(4) The present invention greatly reduces VOC emissions: the bottom plate of a single floating cabin is fully wetted with no gas phase space; the self-connection between the bottom plate and the top plate is all welded, and the gap coefficient of VOC emission is 0;

(5) The floating roof fire-fighting foam only needs to seal and cover the floating roof and the tank wall of the present invention, and the investment in fire protection is small; when a fire occurs, it is easy to fight and control, and the fire is relatively easy to control;

(6) Compared with the traditional prefabricated floating roof, the factory modular prefabricated floating roof has greatly improved the subsidence resistance, the strength and overall stability of the floating roof. , each pontoon is tested for tightness, and the old floating roof cannot meet these requirements;

(7) The floating roof of the present invention is provided with a pipe joint, and the pipe joint can be connected with external leak detection equipment (vacuum pump, compressor, etc.) to detect the tightness of the floating roof, and the connection is simple and fast. The single floating cabin needs to be dismantled for maintenance, fast inspection and convenient maintenance;

(8) A drain funnel and a drain pipe are arranged on the floating roof of the present invention, and the accumulated liquid on the floating roof can be collected into the drain pipe to be discharged through the drain funnel, so that the upper surface of the floating roof does not accumulate liquid and reduces VOC emissions;

(9) In the present invention, a sealing plate is provided outside the welding corner of the top plate and the bottom plate of each single floating tank, and the sealing plate has the dual functions of strengthening and sealing. It can act as a barrier, block the leaking liquid, and increase the sinking resistance of the floating roof.

Description of drawings

Fig. 1 is the structural schematic diagram of the first single floating cabin arrangement in the factory modular prefabricated floating roof of the present invention;

Fig. 2 is the structural schematic diagram of the second type of single floating cabin arrangement in the factory modular prefabricated floating roof of the present invention;

Fig. 3 is the structural schematic diagram of the third single floating cabin arrangement in the factory modular prefabricated floating roof of the present invention;

4 is a schematic structural diagram of the fourth single floating cabin arrangement in the factory modular prefabricated floating roof of the present invention;

Fig. 5 is the structural schematic diagram of the single floating tank bottom plate of the present invention provided with a liquid outlet;

Fig. 6 is the connection structure schematic diagram of the single floating cabin of the present invention;

Fig. 7 is the structural representation of single-layer steel plate overlap of the present invention;

8 is a schematic structural diagram of the aligned welding of single-layer steel plates of the present invention;

9 is a schematic structural diagram of the first single-floating cabin field welding structure of the present invention;

Figure 10 is a schematic structural diagram of the second type of single floating cabin field welding structure of the present invention;

11 is a schematic structural diagram of the third single-floating cabin field welding structure of the present invention;

12 is a schematic structural diagram of the fourth single floating cabin field welding structure of the present invention;

Fig. 13 is the structural representation that the pipe joint of the present invention is arranged on the top plate;

Fig. 14 is the structural schematic diagram of the pipe joint of the present invention arranged on the upper connecting plate;

15 is a schematic structural diagram of the pipe joint of the present invention arranged on the upper extension of the top plate;

Fig. 16 is the structural representation of the drain funnel and drain pipe of the present invention;

Fig. 17 is the installation structure schematic diagram of the sealing plate of the present invention;

Fig. 18 is the structural schematic diagram of the cutting position of the tank wall plate of the present invention;

Fig. 19 is the installation structure schematic diagram of the profiled steel gantry of the present invention;

Fig. 20 is a schematic diagram of the welding position structure of the tank wall plate of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

See Figures 1-4, the layout of the floating roof pontoon is shown in the figure. A factory modular prefabricated floating roof, comprising an edge floating cabin 1 and an intermediate floating cabin 2 arranged in the inner ring of the edge floating cabin 1, and the bottom ends of the edge floating cabin 1 and the intermediate floating cabin 2 are connected with floating roof pillars 3; The edge pontoon 1 and the middle pontoon 2 are connected by a plurality of single pontoons of modular structure. Both are welded and fixed to the side plates, and one or more of the following three welding and fixing structures are selected for welding and fixing between adjacent single floating cabins: connecting plates are used between the top plates or bottom plates of adjacent single floating cabins. The upper and lower layers are fixed by lap welding, the top plate of one single floating cabin and the top plate of the other single floating cabin are directly welded and fixed by the upper and lower layers, and the bottom plate of one single floating cabin and the bottom plate of the other single floating cabin are directly welded. The upper and lower layers are lap welded and fixed; wherein, the bottom plate 4 of each single floating tank is provided with a drain port, when the single floating tank leaks, the drain joint 33 at the drain port is opened, and the drain joint 33 is connected. Remove the pipe plug 34 and gasket 35, and discharge the medium leaking into the single floating cabin (see Figure 5);

When the single pontoon is installed on site, when it is installed to the last one or two single pontoons of each circle, according to the actual installation size, adjust the length of the top plate 5 and the bottom plate 4 in the last or two single pontoons, that is, adjust The length L of the lap welding portion on the top plate 5 and the bottom plate 4 and the side plate 6 is sufficient (see Figure 6);

When the single floating cabin is a single-layer steel plate, the upper and lower layers of the adjacent single-layer steel plates 31 shall be lap welded (see Figure 7) or the ends of the two adjacent single-layer steel plates 31 shall be aligned and welded, and the two adjacent single-layer steel plates shall be welded together. A T-shaped steel 32 is welded directly below the welding point 31 (see Figure 8), that is, the horizontal part of the T-shaped steel 32 is welded and fixed with the lower end surfaces of the two adjacent single-layer steel plates 31, and the welding port is closed;

Referring to Fig. 9, the bottom plate 41 and the peripheral side plate 42 of the single floating cabin are of an integrated bending structure, and the welding part at the top of the peripheral side plate 42 is welded and fixed to the top plate 43. When two adjacent single floating cabins are welded and fixed, the two adjacent single floating cabins are welded and fixed. The bottom plates 41 of the two single floating cabins are flat and fixed by welding through the lower connecting plate 44 , the peripheral side plates 42 of the two single floating cabins are closely attached, and the top plates 43 of the two single floating cabins are flat and welded and fixed by the upper connecting plate 45 .

As shown in Figure 10, the bottom plate and the peripheral side plates of a single floating cabin are integrated bending structures, and the three adjacent single floating cabins include two first floating cabins and one second floating cabin located on both sides respectively or respectively. Two second pontoons and one first pontoon are located on both sides. The tops of the peripheral side plates 52 of the first pontoons are welded to the lower end surfaces of the corresponding top plates 53. The top plates 53 of the first The horizontally extending upper extension of the second pontoon and the horizontal welding portion at the top of the peripheral side plate 55 of the second pontoon are all welded and fixed to the corresponding top plate 56. When the adjacent first pontoon and the second pontoon are welded and fixed, the first The peripheral side plate 52 of the floating cabin and the peripheral side plate 55 of the second floating cabin are closely attached, the bottom plate 51 of the first floating cabin and the bottom plate 54 of the second floating cabin are flush and fixed by welding through the lower connecting plate 57, and the first floating cabin The upper extension part of the top plate 53 is placed directly above the second floating cabin top plate 56 and the two are fixed by welding.

See Figure 11, among multiple single floating cabins, three adjacent single floating cabins include two third floating cabins and one fourth floating cabin on both sides or two fourth floating cabins on both sides respectively cabin and a third floating cabin, the bottom end of the peripheral side plate 62 of the third floating cabin is welded and fixed with the upper end face of the corresponding bottom plate 61, the top end of the peripheral side plate 62 of the third floating cabin is welded and fixed with the lower end face of the corresponding top plate 63, The top plate 63 of the third pontoon includes an upper extension portion extending horizontally toward the adjacent fourth pontoon, and the bottom plate 61 of the third pontoon includes a lower extension portion horizontally extending toward the adjacent fourth pontoon. The bottom plate 64 and the peripheral side plate 65 are of an integrated bending structure, and the horizontal welding part at the top of the peripheral side plate 65 of the fourth floating cabin is welded and fixed with the corresponding top plate 66. When the third floating cabin and the fourth floating cabin are welded and fixed, the third floating cabin is welded and fixed. The peripheral side panels 62 of the third pontoon and the peripheral side panels 64 of the fourth pontoon are closely attached, and the upper extension of the third pontoon roof 63 is placed directly above the fourth pontoon roof 66 and both are welded and fixed. The lower extension of the third pontoon bottom plate 61 is located directly below the fourth pontoon bottom plate 64 and the two are fixed by welding.

See Figure 12, among multiple single floating cabins, three adjacent single floating cabins include two fifth floating cabins and one sixth floating cabin on both sides or two fifth floating cabins on both sides respectively cabin and a sixth floating cabin, the bottom plate 71 and the peripheral side plate 72 of the fifth floating cabin are integrated bending structures, the top of the peripheral side plate 72 of the fifth floating cabin The top plate 73 of the pontoon includes an upper extension extending horizontally toward the adjacent sixth pontoon, the horizontal welding portion at the top of the peripheral side plate 75 of the sixth pontoon is welded and fixed with the corresponding top plate 76, and the peripheral side plate of the sixth pontoon is fixed by welding. The bottom ends of 75 are welded and fixed with the upper end surface of the corresponding bottom plate 74. The bottom plate 74 of the sixth floating cabin includes a lower extension extending horizontally to the adjacent fifth floating cabin. When the fifth floating cabin and the sixth floating cabin are welded and fixed , the peripheral side plate 72 of the fifth pontoon is closely attached to the peripheral side plate 74 of the sixth pontoon, the upper extension of the fifth pontoon roof 73 is placed directly above the sixth pontoon roof 75 and both are welded and fixed , the bottom plate 71 of the fifth pontoon is placed directly above the lower extension of the bottom plate 74 of the sixth pontoon, and the two are fixed by welding.

In the welding and fixing structure of the adjacent single pontoon, the top plate (see Figure 13), the upper connecting plate for roof connection (see Figure 14), the top plate that overlaps the upper layer and is located at the lap joint That is, on the upper extension part of the top plate 5 (see FIG. 15 ), on the single-layer steel plate 31 overlapping the upper layer and located at the overlapping part (see FIG. 7 ), or on the single-layer steel plate 31 directly above the T-shaped steel 32 . There is a pipe joint 8 extending to the outside of the single floating cabin (see Figure 8). When the pipe joint 8 is not subjected to the tightness test, the hexagonal head pipe plug 9 and the rubber gasket 10 are used for sealing.

See Figure 16, the single floating cabin located at the central position of the floating roof is provided with a drain funnel 11 at the central position, the top of the drain funnel 11 is fixedly connected with the top plate 5 of the single floating cabin, and the bottom plate 4 of the single floating cabin is provided with a drain The liquid pipe 12 and the liquid discharge funnel 11 extend into the single floating cabin and are connected with the top of the liquid discharge pipe 12, and the bottom of the liquid discharge pipe 12 extends out of the single floating cabin.

As shown in Figure 17, two L-shaped sealing plates 13 are arranged in each single floating cabin. The ends of the vertical parts of the sealing plates 13 are welded and fixed to the lower end surface of the top plate 5, and the ends of the horizontal parts of the sealing plates 13 are fixed to the periphery. The two opposite inner sides of the side plate 6 are welded and fixed, and the two L-shaped sides of the sealing plate are respectively welded and fixed with the other two opposite inner sides of the peripheral side plate 6 of the single floating cabin.

A method for assembling a factory modular prefabricated floating roof, comprising the following steps:

(1) Tank wall cutting: See Figure 18, select a tank wall plate 14 with a width of 3500mm (the cutting width of the tank wall plate is determined by the single floating roof and the maximum size of the component), there is no opening on the tank wall plate 14, The location is convenient for the transportation of single pontoons and components. The cut seam 15 at the bottom end of the tank wall plate 14 is located at the welding seam between the bottom ring of the tank wall and the edge plate of the tank bottom, and the cut seam 16 at the top of the tank wall plate is located in the tank wall. At the welding seam between the annular tank wall 14 where the plate 14 is located and the adjacent upper annular tank wall 17, the tank wall plate 14 includes two longitudinal slits 18, and the adjacent upper annular tank wall 17 is separated from the tank wall plate 14 by two longitudinal slits. The two upper longitudinal welds 19 with the shortest horizontal distance between the cutting seams 18, the two lower longitudinal welds 20 with the shortest horizontal distance between the two longitudinal cutting seams 18 on the tank bottom edge plate and the tank wall plate 14, and the two upper longitudinal welds 19 respectively The horizontal distance between the longitudinal cutting seam 18 corresponding to the tank wall plate is greater than or equal to 500mm, the horizontal distance between the two lower longitudinal welding seams 20 and the longitudinal cutting seam 18 corresponding to the tank wall plate is greater than or equal to 500mm, the two longitudinal cutting seams of the tank wall plate 18 The horizontal distance between the longitudinal weld on the annular tank wall or the nearest longitudinal weld is greater than or equal to 1200mm;

(2) Install the profiled steel gantry: as shown in Figure 19, connect the inverted U-shaped profiled steel gantry 21 to the cut hole of the tank wall plate 14, and the horizontal part of the top of the profiled steel gantry 21 is connected to the adjacent upper annular tank wall Fixed, the two vertical parts of the profiled steel gantry 21 are respectively connected and fixed with the two longitudinal slits on the storage tank; and between the horizontal part of the top of the profiled steel gantry 21 and the adjacent upper annular tank wall, the two vertical parts of the profiled steel gantry 21 Reinforcing ribs 22 are used for fixing between the two longitudinal slits of the tank wall plate respectively;

(3) Transportation and installation: transport the factory-prefabricated single floating cabins and components of multiple modular structures into the storage tank from the cutting holes of the tank wall plate 14, and then transport the single floating cabins of multiple modular structures according to the structure. The tank is fixed by welding with connecting plates or directly by welding and fixing the top and bottom plates; after the factory modular prefabrication of multiple single floating tanks with modular structure, kerosene penetration test and compressed air tightness test are required. It can be transported into the storage tank for on-site installation;

(4) Connect the vacuum pump to the pipe joint 8, and conduct a vacuum tightness test. The test negative pressure value of the vacuum test shall not be lower than 53kPa, and the holding time shall be 5 minutes. It is qualified if there is no leakage; then connect the pipe joint 8 to the compressor. Connect, carry out a tightness test on each single floating cabin with 1180Pa of compressed air, the pressure stabilization time is not less than 5 minutes, and no leakage is qualified; when the above tests are not qualified, use 785Pa compressed air to blow into each single For the floating tank, use soap solution to detect leaks. When leaks are found first, repair welding and repeat the above leak detection tests until they are qualified;

(5) After passing the inspection, the newly added welds and the damaged parts of the paint film shall be repainted with anti-corrosion coating;

(6) After the floating roof installation inspection is qualified, carry out lifting test and hydraulic test;

(7) Installation of tank wall: As shown in Figure 20, install the cut tank wall plate or the tank wall plate of the same material and specification as the cut tank wall plate to the cutting hole of the storage tank, and weld the longitudinal weld of the tank wall plate 14 Before, cut the two upper annular welds 23 between the bottom ring of the tank wall and the edge plate of the tank bottom, and cut the two lower annular welds between the annular tank wall where the tank opener is located and the adjacent upper annular tank wall 24. The cutting width of the two upper annular welding seams 23 and the two lower annular welding seams 23 is 300mm, and the inner ends of the two upper annular welding seams 23 are respectively located at the top of the two longitudinal cutting seams 18 of the tank wall plate. The inner ends of the welding seams 24 are respectively located at the bottom ends of the two longitudinal cutting seams 18 of the tank wall plate. After the two upper annular welding seams 23 and the two lower annular welding seams 24 are cut, the longitudinal welding seams of the tank wall plate 14 are welded. Finally, the circumferential welds, the two upper circumferential welds 23 and the two lower circumferential welds 24 of the tank wall plate 14 are welded.

When the storage tank is a new storage tank, when the new storage tank is being installed, after the installation of the tank bottom plate is completed, the factory prefabricated multiple modular structure single floating cabins and components are transported to the tank bottom plate, and then the floating roof is carried out on site. Assembly welding, installation and inspection are all that is required, and the operations of step (1) tank wall cutting and step (7) tank wall installation are not required.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. an assembly method of a factory modular prefabricated floating roof, it is characterized in that: the floating roof is divided into a plurality of modules, each module is prefabricated in the factory, and then transported into the storage tank, according to the structure of the floating roof to a plurality of modules and Components are assembled and installed on site to form a factory modular prefabricated floating roof. 2. the assembling method of a kind of factory modular prefabricated floating roof according to claim 1, is characterized in that: specifically comprises the following steps: (1) Tank wall cutting: Select a tank wall plate. The cutting width of this tank wall plate is determined by the maximum size of the single floating roof and the component. There is no opening on the tank wall plate, and the location is convenient for the transportation of the single floating cabin and the component. The cutting seam at the bottom end of the tank wall plate is located at the welding seam between the bottom ring of the tank wall and the edge plate of the tank bottom, and the cutting seam at the top end of the tank wall plate is located between the annular tank wall where the tank wall plate is located and the adjacent upper annular tank wall At the welding seam between, the tank wall plate includes two longitudinal cutting seams, the two upper longitudinal welding seams with the shortest horizontal distance from the two longitudinal cutting seams of the tank wall plate on the adjacent upper annular tank wall, and the distance between the tank bottom edge plate and the tank bottom edge plate. The two lower longitudinal welds with the shortest horizontal distance between the two longitudinal cutting seams of the tank wall plate, the horizontal distance between the two upper longitudinal welding seams and the corresponding longitudinal cutting seam of the tank wall plate is greater than or equal to 500mm, and the two lower longitudinal welding seams are respectively greater than or equal to 500mm. The horizontal distance between the longitudinal welding seam and the corresponding longitudinal cutting seam of the tank wall plate is greater than or equal to 500mm, and the two longitudinal cutting seams of the tank wall plate are located at the longitudinal welding seam on the annular tank wall or between the longitudinal welding seam and the nearest longitudinal welding seam. The horizontal distance is greater than or equal to 1200mm; (2) Installation of profiled steel gantry: Connect the profiled steel gantry of the inverted U-shaped structure to the cutting hole of the tank wall plate, the horizontal part of the top of the profiled steel gantry is connected and fixed with the adjacent upper annular tank wall, and the profiled steel gantry is two vertical. The straight part is connected and fixed with the two longitudinal slits on the storage tank respectively; and the horizontal part of the top of the profiled steel gantry and the adjacent upper annular tank wall, the two vertical parts of the profiled steel gantry and the two longitudinal slits of the tank wall respectively between them are fixed by reinforcing ribs; (3) Transportation and installation: transport the factory-prefabricated single floating cabins and components of multiple modular structures into the storage tank from the cutting holes of the tank wall, and then transport multiple single floating cabins with modular structures according to the structure. The connection plate is welded and fixed or the top plate and the bottom plate are directly welded and fixed; after the modular prefabrication of the multiple modular structures, the kerosene penetration test and the compressed air tightness test are required; (4) Connect the vacuum pump to the pipe joint, and carry out the vacuum tightness test. The test negative pressure value of the vacuum test shall not be lower than 53kPa, and the holding time shall be 5 minutes. It is qualified if there is no leakage; then connect the pipe joint to the compressor, The tightness test is carried out for each single floating cabin with 1180Pa of compressed air inflated, the pressure stabilization time is not less than 5 minutes, and no leakage is qualified; when the above tests are all unqualified, 785Pa compressed air is blown into each single floating cabin. , Use soap solution to detect the leak point, when the leak point is found first, repair the welding and repeat the above leak detection test until it is qualified; (5) After passing the inspection, the newly added welds and the damaged parts of the paint film shall be repainted with anti-corrosion coating; (6) After the floating roof installation inspection is qualified, carry out lifting test and hydraulic test; (7) Installation of the tank wall: Install the cut tank wall plate or the tank wall plate of the same material and specification as the cut tank wall plate to the cutting hole of the storage tank. Before welding the longitudinal weld of the tank wall plate, cut and open the tank. The two upper annular welds between the wall bottom ring and the tank bottom edge plate, cut the two lower annular welds between the annular tank wall where the tank wall plate is located and the adjacent upper annular tank wall, and the two upper annular welds. The inner ends of the seams are respectively located at the top of the two longitudinal slits of the tank wall, the inner ends of the two lower annular welds are respectively located at the bottom ends of the two longitudinal slits of the tank wall, and the two upper annular welds and the two lower annular welds. After the seam cutting is completed, then weld the longitudinal weld of the tank wall plate, and finally weld the circumferential weld of the tank wall plate, the two upper annular welds and the two lower annular welds. 3. The on-site installation method of a factory modular prefabricated floating roof according to claim 1, characterized in that: when the storage tank is a new storage tank, when the new storage tank is being installed, after the tank bottom plate is installed, The factory prefabricated single floating cabins and components of multiple modular structures are transported to the bottom of the tank, and then the on-site assembly welding, installation and testing of the floating roof are carried out. 4. The assembling method of a factory modular prefabricated floating roof according to claim 1, characterized in that: when the multiple modules are all single floating cabin structures, each single floating cabin is composed of a top plate, a bottom plate and a The peripheral side panels are made by factory modular prefabrication and welding, and one or more of the following three welding and fixing structures are selected between adjacent single floating cabins for welding and fixing. The connecting plates are lap welded and fixed, the top plate of one single floating cabin and the other single floating cabin are directly lap welded and fixed at the upper and lower layers, and the bottom plate of one single floating cabin and the bottom plate of the other single floating cabin are directly welded and fixed. The upper and lower layers are directly welded and fixed by lap welding. When the single floating cabin is installed on site, when it is installed to the last one or two single floating cabins in each circle, adjust the middle top plate of the last one or two single floating cabins according to the actual installation size. and the length of the bottom plate, that is, adjusting the length of the lap welding part on the top plate and the bottom plate; when the single floating cabin is a single-layer steel plate, the upper and lower layers of the adjacent single-layer steel plates shall be lap welded or two-phase welded. After the ends of the adjacent single-layer steel plates are aligned and welded, a T-shaped steel is welded directly below the welding point of the two adjacent single-layer steel plates, that is, the horizontal part of the T-shaped steel is welded and fixed to the lower end surface of the two adjacent single-layer steel plates, and the butt welded joint to be closed. 5. The method for assembling a factory modular prefabricated floating roof according to claim 4, wherein the single floating cabin located at the center of the floating roof is provided with a drain funnel at the center position. The top is fixedly connected with the top plate of the single floating cabin, and the bottom plate of the single floating cabin is provided with a drain pipe. The drain funnel extends into the single floating cabin and is connected to the top of the drain pipe. into the single floating cabin; each single floating cabin is provided with two L-shaped sealing plates, the end of the vertical part of the sealing plate is welded and fixed with the lower end surface of the top plate, and the end of the horizontal part of the sealing plate is fixed by welding It is welded and fixed with two opposite inner sides of the peripheral side plates, and the two L-shaped sides of the sealing plate are respectively welded and fixed with the other two opposite inner sides of the peripheral side plates of the single floating cabin; the bottom plate of each single floating cabin is provided with There is a drain port, when the single floating tank leaks, that is, open the drain port to discharge the medium leaking into the single floating tank. 6. The method for assembling a factory modular prefabricated floating roof according to claim 4, characterized in that: the bottom plate and the peripheral side plate of the single floating cabin are of an integrated bending structure, and the welding of the top of the peripheral side plate The parts are welded and fixed to the top plate. When the two adjacent single floating cabins are welded and fixed, the bottom plates of the two single floating cabins are flat and fixed by welding through the lower connecting plate, and the peripheral side plates of the two single floating cabins are closely attached. The top plate of the single floating cabin is flat and fixed by welding on the upper connecting plate. 7. The method for assembling a factory modular prefabricated floating roof according to claim 4, wherein the bottom plate and the peripheral side plate of the single floating cabin are integrated bending structures, and three adjacent single Floating cabin, including two first floating cabins and one second floating cabin respectively located on both sides or two second floating cabins and one first floating cabin respectively located on both sides, the top of the peripheral side plate of the first floating cabin They are welded to the lower end face of the corresponding top plate. The top plate of the first pontoon includes an upper extension extending horizontally toward the adjacent second pontoon. , when the adjacent first pontoon and second pontoon are welded and fixed, the peripheral side panels of the first pontoon and the second pontoon are closely attached, and the bottom plate of the first pontoon and the second pontoon are flat and pass through The lower connecting plate is welded and fixed, and the upper extension of the top plate of the first floating cabin is placed directly above the top plate of the second floating cabin, and the two are welded and fixed. 8 . The method for assembling a factory modular prefabricated floating roof according to claim 4 , wherein: among the plurality of single floating cabins, the three adjacent single floating cabins include two Two third pontoons and one fourth pontoon or two fourth pontoons and one third pontoon located on both sides respectively, the bottom end of the peripheral side plate of the third pontoon is welded and fixed with the upper end face of the corresponding bottom plate , the top end of the peripheral side plate of the third pontoon is welded and fixed with the lower end surface of the corresponding top plate, the top plate of the third pontoon includes an upper extension extending horizontally toward the adjacent fourth pontoon, and the bottom plate of the third pontoon includes a direction The lower extension of the adjacent fourth pontoon horizontally extending, the bottom plate and the peripheral side plate of the fourth pontoon is an integrated bending structure, and the horizontal welding part at the top of the peripheral side plate of the fourth pontoon is welded and fixed with the corresponding top plate, When the third pontoon and the fourth pontoon are welded and fixed, the peripheral side panels of the third pontoon and the fourth pontoon are closely attached, and the upper extension of the roof of the third pontoon is placed directly above the roof of the fourth pontoon and The two are welded and fixed, and the lower extension of the bottom plate of the third floating cabin is located directly below the bottom plate of the fourth floating cabin, and the two are welded and fixed. 9 . The method for assembling a factory modular prefabricated floating roof according to claim 4 , wherein: among the plurality of single floating cabins, the three adjacent single floating cabins include two Two fifth pontoons and one sixth pontoon or two fifth pontoons and one sixth pontoon located on both sides respectively, the bottom plate and peripheral side panels of the fifth pontoon are integrated bending structures, the first The tops of the peripheral side plates of the five floating cabins are welded and fixed to the lower end surfaces of the corresponding top plates. The top plate of the fifth floating cabin includes an upper extension extending horizontally toward the adjacent sixth floating cabin. The top of the peripheral side plate of the sixth floating cabin is horizontally The welded parts are welded and fixed with the corresponding top plate, the bottom ends of the peripheral side plates of the sixth floating cabin are welded and fixed with the upper end surface of the corresponding bottom plate, and the bottom plate of the sixth floating cabin includes a downward extension extending horizontally to the adjacent fifth floating cabin. When the fifth pontoon and the sixth pontoon are welded and fixed, the peripheral side plates of the fifth pontoon and the sixth pontoon are closely attached, and the upper extension of the roof of the fifth pontoon is placed on the positive side of the roof of the sixth pontoon. The upper part and the two are welded and fixed, and the bottom plate of the fifth floating cabin is placed directly above the lower extension part of the bottom plate of the sixth floating cabin, and the two are welded and fixed. 10. The method for assembling a factory modular prefabricated floating roof according to any one of claims 4, characterized in that: in the welding and fixing structure of the adjacent single floating cabins, the roof plate is used for the roof plate. Connected on the connecting plate, on the top plate of the lapped upper layer and located on the lap joint, on the single-layer steel plate of the lapped upper layer and located at the lap joint, or on the single-layer steel plate directly above the T-shaped steel. Pipe fittings extending outside the single floating cabin.

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