Underwater expansion bent flange gasket auxiliary installation device and installation method

Abstract

The invention relates to the field of ocean engineering, in particular to an auxiliary mounting device and method for an underwater expansion bent flange gasket, and aims to solve the technical problems that the underwater expansion bent flange gasket is inconvenient to mount and easy to damage in the prior art. The device comprises an anti-falling component and an auxiliary mounting mechanism, the multiple anti-disengaging assemblies are configured to be arranged on the flange around the axis of the flange at intervals under the working condition that the gasket is installed so as to support the gasket. The auxiliary installation mechanism comprises a bottom plate and a fastening assembly, the bottom plate is provided with an arc-shaped groove matched with the gasket, and the fastening assembly is arranged on the bottom plate and used for being detachably connected with the gasket so that the gasket can be locked in the arc-shaped groove or the gasket can be separated from the bottom plate through unlocking. By the adoption of the device, a diver can complete installation and adjustment of the gasket on the outer sides of the flanges, the risk of hand clamping caused by operation in the flange plates is avoided, the gasket can be installed in a gap between the two flanges, the risk that the gasket is separated from a flange groove is reduced, and the installation efficiency of the gasket is improved.

Description

Technical Field

[0001] The invention relates to the field of marine engineering, and in particular to an auxiliary installation device and an installation method for an underwater expansion bend flange gasket. Background Art

[0002] The underwater expansion bend is usually connected to the submarine pipeline and the underwater manifold in the form of flanges. For submarine oil and gas pipelines with higher design pressures, the flange + metal octagonal gasket connection is mainly used, such as Figure 1 and Figure 2 As shown, a diver docks the expansion bend flange underwater, places the gasket in the groove of the flange, and applies a rated torque value to the bolt to achieve the sealing performance of the flange.

[0003] Due to the influence of natural factors such as waves and tidal changes, the main operating ship will rise and fall with the waves. At the same time, it is very dangerous for divers to install flange gaskets in limited and narrow spaces with insufficient underwater visibility, which may easily endanger the personal safety of divers. Up to now, divers have no special tools to install metal octagonal gaskets underwater, and usually tie thin ropes on the gaskets. Divers put the gaskets into the expansion bend flange groove by lowering thin ropes underwater. This operation method requires sufficient working space between the two flanges. When the thin rope is subsequently removed from the contact surface between the single-side flange groove and the gasket, the gasket is prone to detach from the flange groove during the pulling process of the thin rope; furthermore, during the subsequent bolt tightening process, the gasket is very easy to fall off in the flange groove due to the shaking of the underwater expansion bend, and the metal octagonal gasket is easily damaged by the collision between the flanges, and the gasket sealing requirements cannot be met. In addition, when installing large-diameter underwater expansion bend gaskets, the difficulty of underwater operation for divers increases significantly. Usually, they can only stand on the top of the underwater expansion bend and use a thin rope to lower the gasket into the flange groove. The shaking of the underwater expansion bend can easily cause the diver's center of gravity to be unstable, which is dangerous. Summary of the invention

[0004] The object of the present invention is to provide an auxiliary installation device and an installation method for an underwater expansion bend flange gasket, so as to solve the technical problems of inconvenient installation and easy damage of underwater expansion bend flange gaskets in the prior art.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] In a first aspect, the present invention provides an underwater expansion bend flange gasket auxiliary installation device, comprising: an anti-slip assembly and an auxiliary installation mechanism;

[0007] The anti - detachment component is connected to the flange by bolts, and multiple anti - detachment components can be configured on the flange bolt holes, and are arranged on the flange at intervals around the axis of the flange. Under the condition of installing the washer, the outer contour surface of the anti - detachment component is always in contact with the outer ring surface of the washer to support the washer;

[0008] The auxiliary installation mechanism includes a bottom plate and a fastening component. Among them, an arc - shaped groove adapted to the washer is provided on the bottom plate, and the fastening component is arranged on the bottom plate and is used for detachably connecting with the washer to lock the washer in the arc - shaped groove or unlock it to separate the washer from the bottom plate.

[0009] Furthermore, the anti - detachment component includes a fixing plate and a limiting plate;

[0010] The fixing plate is bolt - connected to the flange;

[0011] The limiting plate is arranged on the side of the fixing plate and is used for closely adhering to the washer.

[0012] Furthermore, the fixing plate includes an operation rod and a circular plate which are integrally formed;

[0013] One end of the operation rod is connected to the side surface of the circular plate, and the other end extends in a direction away from the circular plate;

[0014] The circular plate is bolt - connected to the flange, and the limiting plate is arranged on the circular plate.

[0015] Furthermore, the limiting plate is arc - shaped and extends along the side surface of the circular plate.

[0016] Furthermore, there are two anti - detachment components, and the two anti - detachment components are used for being respectively arranged at the 4 - o'clock and 8 - o'clock directions of the flange.

[0017] Furthermore, the bottom plate is arc - shaped;

[0018] There are multiple fastening components, and the multiple fastening components are arranged at intervals on the outer side surface of the bottom plate around the axis of the bottom plate.

[0019] Furthermore, the fastening component includes a base, a tether post, a thin rope, and a fastener;

[0020] The base is arranged on the bottom plate;

[0021] The tether post protrudes from the surface of the base;

[0022] The first rope - passing hole and the second rope - passing hole are provided on the bottom plate, and the first rope - passing hole and the second rope - passing hole are respectively arranged on both sides of the arc - shaped groove;

[0023] One end of the thin rope is arranged on the tether post, and the other end passes through the first rope - passing hole and then passes out from the second rope - passing hole;

[0024] The fastener is disposed on the base and connected to the other end of the thin string.

[0025] Furthermore, the fastener includes a handle and a positioning pin;

[0026] The handle is slidably connected to the base, and the sliding path extends along the radial direction of the base plate;

[0027] Along the sliding direction of the handle, a plurality of spaced-apart limiting holes are provided on the handle;

[0028] A positioning hole is provided on the base, and the positioning pin is used to pass through the positioning hole and the limiting hole.

[0029] Furthermore, a hook is provided at one end of the handle close to the base plate, and the hook is used to connect with the thin string.

[0030] In a second aspect, the present invention further provides an installation method, which is based on the underwater expansion bend flange gasket auxiliary installation device described above, and includes the following steps;

[0031] S100: Before lowering the underwater expansion bend, install two anti-disengagement components at the four o'clock and eight o'clock directions thereof;

[0032] S200: The bottoms of the underwater expansion bend flange and the underwater pipeline flange are fixed by bolts, and the distance between the two is adjusted to 5-8 cm;

[0033] S300: Place the gasket in the arc-shaped groove and lock it through the fastening component;

[0034] S400: The diver gradually lowers the auxiliary installation mechanism with the gasket from above the underwater expansion bend flange until the gasket contacts the anti-disengagement component, and then the diver places the gasket into the groove of the underwater expansion bend flange;

[0035] S500: Operate the fastening component to release the lock on the gasket, and cooperate with the base plate to evenly press the gasket into the groove of the underwater expansion bend flange;

[0036] S600: Remove the auxiliary installation mechanism from between the underwater expansion bend flange and the underwater pipeline flange, and the diver continues to tighten the bolts. When the gasket fits with the groove of the underwater pipeline flange, remove the anti-disengagement component.

[0037] Based on the above technical solutions, the technical effects that can be achieved by the underwater expansion bend flange gasket auxiliary installation device provided by the present invention are as follows:

[0038] The underwater expansion bend flange gasket auxiliary installation device provided by the present invention includes an anti - detachment component and an auxiliary installation mechanism; the anti - detachment component is used for detachably connecting with the flange, and there are multiple of them, configured to be arranged at intervals around the axis of the flange under the working condition of installing the gasket to support the gasket; the auxiliary installation mechanism includes a bottom plate and a fastening component. Among them, an arc - shaped groove adapted to the gasket is provided on the bottom plate, and the fastening component is arranged on the bottom plate and used for detachably connecting with the gasket to lock the gasket in the arc - shaped groove or unlock it to separate the gasket from the bottom plate.

[0039] In this underwater expansion bend flange gasket auxiliary installation device, the anti - detachment component can provide effective support for the gasket, avoiding the phenomenon that the gasket falls off from the flange groove during the installation process, and ensuring the success rate of gasket installation; furthermore, the anti - detachment component will contact the other flange prior to the gasket, preventing the two flanges from colliding and squeezing the gasket, thus playing a role in protecting the gasket; the bottom plate plays a limiting role on the gasket. By cooperating with the fastening component, the gasket is locked in the arc - shaped groove. When the gasket is lowered through the auxiliary installation mechanism, the bottom plate also plays a protective role on the gasket. At the same time, divers can complete the installation and fine - tuning of the gasket outside the flange, avoiding the risk of the diver's hand being pinched during the operation inside the flange disc.

[0040] When installing the gasket, after the underwater expansion bend flange and the bottom of the underwater pipeline flange are fixed with bolts, when the gap between the two flanges is 5 - 8, the gasket is installed. Divers stand on both sides of the docking position of the underwater expansion bend flange. After the gasket is placed into the groove of the underwater expansion bend flange through the coordinated cooperation of the auxiliary installation mechanism, the anti - detachment component provides temporary support for the gasket to prevent the gasket from falling off. Then, the fastening group releases the temporary fixation of the gasket and cooperates with the bottom plate to evenly press the gasket into the groove. After the pressing is completed, the auxiliary installation mechanism is removed from the gap between the two flanges. The diver continues to tighten the bolts. When the gasket fits with the flange groove on the other side, the diver removes the anti - detachment component on the flange disc to complete the installation work of the flange gasket.

[0041] It can be seen that compared with the prior art, using this underwater expansion bend flange gasket auxiliary installation device can solve the problem of difficult installation operation of underwater large - diameter flange gaskets, effectively ensuring the safety of divers during underwater operation. Divers can complete the installation and fine - tuning of the gasket outside the flange, avoiding the risk of the diver's hand being pinched during the operation inside the flange disc. The installation of the gasket can be operated within the gap range of 5 cm - 8 cm between the two flanges, reducing the risk of the gasket falling out of the flange groove and improving the installation efficiency of the gasket; in addition, the anti - detachment component provides effective support for the gasket, avoiding the problem of the gasket falling off in the flange groove, reducing the impact of the shaking of the underwater expansion bend on the installation of the large - diameter gasket, and ensuring the success rate of the flange sealing performance test. Description of the Drawings

[0042] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 Schematic diagram of the existing installation method of the washer;

[0044] Figure 2 For Figure 1 Enlarged view of part Ⅰ in

[0045] Figure 3 Schematic diagram of the structure of the underwater expansion bend flange washer auxiliary installation device provided by the embodiment of the present invention;

[0046] Figure 4 Front view of the underwater expansion bend flange washer auxiliary installation device provided by the embodiment of the present invention;

[0047] Figure 5 Schematic diagram of the structure of the auxiliary installation mechanism provided by the embodiment of the present invention;

[0048] Figure 6 For Figure 5 Enlarged view of part Ⅱ in

[0049] Figure 7 Schematic diagram of the application of the underwater expansion bend flange washer auxiliary installation device provided by the embodiment of the present invention.

[0050] Icon: 100 - anti - detachment component; 110 - fixing plate; 120 - limiting plate;

[0051] 200 - auxiliary installation mechanism; 210 - bottom plate; 220 - fastening component; 211 - arc groove; 212 - first rope - passing hole; 213 - second rope - passing hole; 221 - base; 222 - rope - tying post; 223 - thin rope; 224 - fastener;

[0052] 300 - flange; 400 - washer. Specific embodiments

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0054] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0056] Up to now, divers have no special tools to install metal octagonal washers underwater, and usually tie a thin rope on the washers. Divers put the washers into the groove of the expansion bend flange by lowering the thin rope underwater. This operation method requires sufficient working space between the two flanges. When the thin rope is subsequently removed from the contact surface between the single-side flange groove and the washers, the washers are prone to detach from the flange groove during the pulling of the thin rope; furthermore, during the subsequent bolt tightening process, the washers are very likely to fall off in the flange groove due to the shaking of the underwater expansion bend, and are easily damaged by the collision between the flanges, making it impossible to achieve the sealing requirements of the washers. In addition, when installing large-caliber underwater expansion bend washers, the difficulty of underwater operation for divers increases significantly. Usually, they can only stand on the top of the underwater expansion bend and use the thin rope to lower the washers into the flange groove. The shaking of the underwater expansion bend can easily cause the diver's center of gravity to be unstable, which is dangerous.

[0057] In view of this, the present invention provides an underwater expansion bend flange gasket auxiliary installation device, including an anti-slip assembly 100 and an auxiliary installation mechanism 200; the anti-slip assembly 100 is used to be detachably connected to the flange 300, and is provided with a plurality of components, which are configured to be arranged on the flange 300 at intervals around the axis of the flange 300 when the gasket 400 is installed, so as to support the gasket 400; the auxiliary installation mechanism 200 includes a base plate 210 and a fastening assembly 220, wherein the base plate 210 is provided with an arc groove 211 adapted to the gasket 400, and the fastening assembly 220 is arranged on the base plate 210, and is used to be detachably connected to the gasket 400, so as to lock the gasket 400 in the arc groove 211, or unlock the gasket 400 to separate it from the base plate 210.

[0058] In the underwater expansion bend flange gasket auxiliary installation device, the anti - detachment component 100 can provide effective support for the gasket 400, preventing the gasket 400 from falling out of the groove of the flange 300 during the installation process, and ensuring the success rate of the gasket 400 installation. Moreover, the anti - detachment component 100 will contact the other flange 300 prior to the gasket 400, preventing the two flanges 300 from colliding and squeezing the gasket 400, thus playing a role in protecting the gasket 400. The bottom plate 210 plays a preliminary limiting role for the gasket 400. By cooperating with the fastening component 220, the gasket 400 is locked in the arc - shaped groove 211. When the gasket 400 is lowered through the auxiliary installation mechanism 200, the bottom plate 210 also plays a protective role for the gasket 400, and at the same time enables the diver to complete the installation and adjustment of the gasket 400 outside the flange 300, avoiding the risk of the diver's hand being pinched during the operation inside the flange 300 disc.

[0059] When installing the gasket 400, after the underwater expansion bend flange and the bottom of the underwater pipeline flange are fixed with bolts, when the gap between the two flanges 300 is 5 - 8, install the gasket 400. The two divers only need to stand on both sides of the underwater expansion bend. After the gasket 400 is placed into the groove of the underwater expansion bend flange through the coordinated cooperation of the auxiliary installation mechanism 200, the anti - detachment component 100 provides temporary support for the gasket 400 to prevent the gasket 400 from falling off. Then, the fastening group releases the temporary fixation of the gasket 400, and cooperates with the bottom plate 210 to evenly press the gasket 400 into the groove. After the pressing is completed, the auxiliary installation mechanism 200 is removed from the gap between the two flanges 300, and the diver continues to tighten the bolts. When the gasket 400 fits with the groove of the flange 300 on the other side, the diver removes the anti - detachment component 100 on the flange 300 disc to complete the installation of the flange 300 gasket 400.

[0060] It can be seen that compared with the prior art, using this underwater expansion bend flange gasket auxiliary installation device can solve the problem of difficult installation operation of the underwater large - diameter flange 300 gasket 400, effectively ensure the safety of divers during underwater installation. Divers can complete the installation and adjustment of the gasket 400 outside the flange 300, avoiding the safety risk of the diver's hand being pinched during the operation inside the flange 300 disc. The installation of the gasket 400 can be operated within the gap range of 5 cm - 8 cm between the two flanges 300, reducing the risk of the gasket 400 detaching from the flange 300 groove and improving the installation efficiency of the gasket 400. In addition, the anti - detachment component 100 provides effective support for the gasket 400, avoiding the problem of the gasket 400 falling off in the flange 300 groove, reducing the impact of the shaking of the underwater expansion bend on the installation of the large - diameter gasket 400, and ensuring the success rate of the flange 300 sealing performance test.

[0061] The following combines Figures 3 to 7 to elaborate in detail on the structure and shape of the underwater expansion bend flange gasket auxiliary installation device provided in this embodiment:

[0062] Regarding the anti - detachment component 100, specifically:

[0063] Referring to Figure 3 and Figure 4 , the anti - detachment component 100 includes a fixing plate 110 and a limiting plate 120; the fixing plate 110 includes an integrally formed operating rod and a circular plate. One end of the operating rod is connected to the side surface of the circular plate, and the other end extends away from the circular plate. The circular plate is bolt - connected to the flange 300; the limiting plate 120 is arc - shaped and extends along the side surface of the circular plate.

[0064] During application, two anti - detachment components 100 are installed in the 4 - o'clock and 8 - o'clock directions of the bolt holes of the flange 300. The circular plate is provided with threaded holes, and bolts pass through the bolt holes and are fixed on the plane of the flange 300. On the other side of the bolt hole, the nut is in contact with the end face of the flange 300 to limit the displacement of the anti - detachment component 100. The limiting plate 120 is in close contact with the washer 400 to support the washer 400 and prevent the washer 400 from falling off in the groove. The limiting plate 120 is fan - shaped. When the anti - detachment component 100 rotates axially in the bolt hole of the flange 300, the limiting plate 120 is always in close contact with the outer diameter of the washer 400, so as to achieve the effect that the anti - detachment component 100 can still provide support for the washer 400 under the condition of local rotation.

[0065] Regarding the auxiliary installation mechanism 200, specifically:

[0066] Referring to Figures 3 to 6 , the auxiliary installation mechanism 200 is composed of a bottom plate 210, a base 221, a rope - tying post 222, a first rope - passing hole 212, a second rope - passing hole 213, a thin rope 223, and a fastener 224. The fastener 224 includes a handle, a positioning pin, and a hook. The bottom plate 210 is arc - shaped, and an arc - shaped groove 211 for placing the washer 400 is engraved on it. Butter is smeared in the arc - shaped groove 211 to temporarily fix the washer 400 in the groove; bases 221 are added in the left, right, and upper directions of the bottom plate 210, and the thin ropes 223 fix the washer 400 in the upper, left, and right directions of the bottom plate 210 respectively to prevent the washer 400 from falling off the bottom plate 210. One end of the thin rope 223 is fixed to the rope - tying post 222, and the other end winds from the first rope - passing hole 212 to the back of the bottom plate 210, then winds out from the second rope - passing hole 213 and is fixed to the hook. The handle is moved outward. After the maximum pulling force for the temporary fixation of the thin rope 223 is reached, the positioning pin is inserted into the positioning hole and the limiting hole to achieve the temporary fixation of the washer 400.

[0067] During application, after the underwater expansion bend flange and the underwater manifold flange are fixed at the bottom with bolts, when the gap between the flanges 300 is 5 - 8 cm, the washer 400 is installed. The diver only needs to stand on both sides of the docking position of the underwater expansion bend flange. After the washer 400 is placed in the groove through the cooperative operation of the auxiliary installation mechanism 200, the anti - detachment component 100 provides temporary support for the washer 400 to prevent the washer 400 from falling off. The upper, left, and right fixing thin ropes 223 are released, and the auxiliary installation mechanism 200 is removed from the gap between the two flanges 300. The diver continues to tighten the installation bolts. When the washer 400 fits with the groove of the flange 300 on the other side, the diver removes the anti - detachment component 100 on the flange 300 disc, completing the installation of the washer 400 for the flange 300.

[0068] The present invention also provides an installation method. The implementation of this method is based on the above - mentioned underwater expansion bend flange washer auxiliary installation device, and includes the following steps:

[0069] S100: Install two anti - detachment components 100 at the four - point and eight - point directions of the underwater expansion bend before it is lowered; S200: Fix the bottoms of the underwater expansion bend flange and the underwater manifold flange with bolts, and adjust the distance between the two to 5 - 8 cm; S300: Place the washer 400 in the arc - shaped groove 211 and lock it through the fastening component 220; S400: Put the washer 400 from above the underwater expansion bend flange until the washer 400 contacts the anti - detachment component 100, and then the diver places the washer 400 into the groove of the underwater expansion bend flange; S500: Operate the fastening component 220 to release the lock on the washer 400, and cooperate with the bottom plate 210 to evenly press the washer 400 into the groove of the underwater expansion bend flange; S600: Remove the auxiliary installation mechanism 200 from between the underwater expansion bend flange and the underwater manifold flange. The diver continues to tighten the bolts, and when the washer 400 fits with the groove of the underwater manifold flange, remove the anti - detachment component 100.

[0070] In the above, the underwater expansion bend flange docking usually uses a metal octagonal washer 400. Before the underwater expansion bend is lowered, two anti - detachment components 100 are installed at the 4 - point and 8 - point directions of the flange 300, as Figure 3 and Figure 4 shown. The anti - detachment component 100 is made of high - density material and has sufficient strength to resist the collision force between the flanges 300 without deformation. The fixing plate 110 is fixed on the flange 300 disc with bolts and nuts to prevent it from falling off. The limiting plate 120 is a 15 - mm - thick convex arc plate, which solves the problem that even when the anti - detachment component 100 undergoes local displacement around the bolt due to collision, the top surface of the convex arc plate can still be in close contact with the washer 400.

[0071] When inserting the installation bolts and adjusting the distance between the two flanges 300 to be 5 cm - 8 cm, place the washer 400 from the upper part of the flange 300. When the washer 400 is completely fitted into the groove of the flange 300, make the arc plate of the anti - detachment component 100 in close contact with the bottom of the washer 400 by adjustment, providing sufficient support for the washer 400 to avoid the problem of the washer 400 falling off. After the washer 400 is in full contact with the groove of the flange 300 disc, remove the anti - detachment component 100, continue to tighten the installation bolts until the two flange 300 surfaces are in close contact, and apply the torque value to complete the butt - joint work of the underwater expansion bend flange.

[0072] The auxiliary installation mechanism 200 is made of aluminum alloy, having the advantages of light weight and high strength. Refer to Figure 7 , the divers stand on both sides of the butt - joint position of the underwater expansion bend flange, put the washer 400 from the upper part of the flange 300 through the auxiliary installation mechanism 200, the divers cooperate to place the washer 400 into the groove of the flange 300, then loosen the base 221, release the temporary fixation of the string 223 on the washer 400, and jointly press the washer 400 evenly into the groove with the bottom plate 210. After checking that the anti - detachment component 100 provides effective support for the washer 400, move the auxiliary installation mechanism 200 away from the gap between the flanges 300 to complete the lowering of the washer 400 of the flange 300.

[0073] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An auxiliary installation device for an underwater expansion bend flange gasket, characterized in that, Comprising: An anti - detachment component (100) and an auxiliary installation mechanism (200); The anti - detachment component (100) is bolt - connected to the flange (300), and multiple anti - detachment components can be configured on the bolt holes of the flange (300), which are arranged on the flange (300) at intervals around the axis of the flange (300). Under the working condition of the installation washer (400), the outer contour surface of the anti - detachment component (100) is always in contact with the outer ring surface of the washer (400) to support the washer (400); The auxiliary installation mechanism (200) includes a bottom plate (210) and a fastening component (220). Among them, an arc - shaped groove (211) adapted to the washer (400) is provided on the bottom plate (210), and the fastening component (220) is arranged on the bottom plate (210) and is used for detachably connecting with the washer (400) to lock the washer (400) in the arc - shaped groove (211) or unlock to make the washer (400) separate from the bottom plate (210).

2. The underwater expansion bend flange gasket auxiliary installation device according to claim 1, characterized in that, The anti - detachment component (100) includes a fixing plate (110) and a limiting plate (120); The fixing plate (110) is bolt - connected to the flange (300); The limiting plate (120) is arranged on the side surface of the fixing plate (110) and is used for closely adhering to the washer (400).

3. The underwater expansion bend flange gasket auxiliary installation device according to claim 2, wherein The fixing plate (110) includes an integrally formed operating rod and a circular plate; One end of the operating rod is connected to the side surface of the circular plate, and the other end extends in a direction away from the circular plate; The circular plate is bolt - connected to the flange (300), and the limiting plate (120) is arranged on the circular plate.

4. The underwater expansion bend flange gasket auxiliary installation device according to claim 3, characterized in that, The limiting plate (120) is arc - shaped and extends along the side surface of the circular plate.

5. The underwater expansion bend flange gasket auxiliary installation device according to any one of claims 1 to 4, characterized in that, There are two anti - detachment components (100), and the two anti - detachment components (100) are used for being respectively arranged at the 4 - o'clock and 8 - o'clock directions of the flange (300).

6. The underwater expansion bend flange gasket auxiliary installation device according to claim 1, characterized in that The bottom plate (210) is arc - shaped; There are multiple fastening components (220), and multiple fastening components (220) are arranged at intervals on the outer side surface of the bottom plate (210) around the axis of the bottom plate (210).

7. The underwater expansion bend flange gasket auxiliary installation device according to claim 6, characterized in that, The fastening component (220) includes a base (221), a tether post (222), a thin string (223), and a fastener (224); The base (221) is arranged on the bottom plate (210); The tether post (222) protrudes from the surface of the base (221); A first string - passing hole (212) and a second string - passing hole (213) are provided on the bottom plate (210), and the first string - passing hole (212) and the second string - passing hole (213) are respectively arranged on both sides of the arc - shaped groove (211); One end of the thin string (223) is arranged on the tether post (222), and the other end passes through the first string - passing hole (212) and then passes out from the second string - passing hole (213); The fastener (224) is arranged on the base (221) and is connected to the other end of the thin string (223).

8. The underwater expansion bend flange gasket auxiliary installation device according to claim 7, characterized in that The fastener (224) includes a handle and a positioning pin; The handle is slidably connected to the base (221), and the sliding path extends along the radial direction of the bottom plate (210); Along the sliding direction of the handle, a plurality of limiting holes are arranged on the handle at intervals. A positioning hole is arranged on the base (221), and the positioning pin is used to pass through the positioning hole and the limiting hole.

9. The underwater expansion bend flange gasket auxiliary installation device according to claim 8, characterized in that, A hook is arranged at one end of the handle close to the bottom plate (210), and the hook is used to connect with the thin rope (223).

10. An installation method, characterized in that, Based on the underwater expansion elbow flange gasket auxiliary installation device according to any one of claims 1 to 9, the following steps are included: S100: Before the underwater expansion elbow is lowered, two anti-disengagement components (100) are installed in the four o'clock and eight o'clock directions thereof. S200: The bottoms of the underwater expansion elbow flange and the underwater pipeline flange are fixed by bolts, and the distance between the two is adjusted to 5-8 cm. S300: Place the gasket (400) in the arc-shaped groove (211) and lock it through the fastening component (220). S400: The diver gradually lowers the auxiliary installation mechanism (200) with the gasket (400) from above the underwater expansion elbow flange until the gasket (400) contacts the anti-disengagement component (100), and then the diver places the gasket (400) into the groove of the underwater expansion elbow flange. S500: Operate the fastening component (220) to release the lock on the gasket (400), and cooperate with the bottom plate (210) to evenly press the gasket (400) into the groove of the underwater expansion elbow flange. S600: Remove the auxiliary installation mechanism (200) from between the underwater expansion elbow flange and the underwater pipeline flange, and the diver continues to tighten the bolts. After the gasket (400) fits into the groove of the underwater pipeline flange, remove the anti-disengagement component (100).

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