A new type of underwater maintenance connection device for submarine pipelines

Abstract

The application relates to an underwater replacement and maintenance device for a locally damaged pipe section of a submarine pipeline, in particular to a novel underwater maintenance connecting device for a submarine pipeline. The device comprises a movable rotary ring, a fixed rotary ring, a front end cover, an original pipeline, a pushing arm, a lock block support ring, a lock block, a lock block blocking ring, a shell, a convex flange, a rear outer sealing blocking ring, a front clasp ring, a rear inner sealing blocking ring, a rear clasp ring and a concave flange. The device is permanently sealed by using graphite material for main sealing. The movable rotary ring and the fixed rotary ring are mainly used in cooperation with other structures, and can be applied to the submarine pipeline with large deformation. The cooperation type of the convex flange and the concave flange improves the sealing performance and simplifies the underwater construction requirement. The sealing studs and the locking studs are uniformly spaced and independently act, which improves the sealing and locking reliability and is convenient for underwater installation operation. The whole device has the characteristics of large deformation adaptability of the pipeline, convenient underwater installation tool operation, simple operation, reliable fixation and sealing, no limitation of operation water depth and the like.

Description

TECHNICAL FIELD

[0001] The application relates to an underwater replacement and repair device for a locally damaged pipe section of a submarine pipeline, in particular to an underwater repair connecting device for a submarine pipeline. BACKGROUND

[0002] In-service submarine oil and gas transmission pipelines may have defects or damages in local pipe sections due to corrosion, external force and other factors, which affect the use safety and require replacement of the defective or damaged pipe sections. The underwater welding or underwater mechanical connection mode is usually adopted. The underwater welding is limited by water depth and is difficult to guarantee the quality. At present, the underwater mechanical connection mode is more applied, but the underwater construction is difficult and the service life is short. The repaired submarine pipeline requires a higher pipe body condition. The application adopts a special structure type and sealing material, has a wide application range and a long service life. SUMMARY

[0003] The application aims at overcoming the defects of the prior art and providing an underwater repair connecting device for a submarine pipeline. The device has the characteristics of easy underwater installation, low requirement on the original submarine pipeline condition, reliable fixation, long service life and no limitation by water depth, and is particularly suitable for underwater repair of a submarine pipeline.

[0004] The technical scheme is as follows: a novel underwater repair connecting device for a submarine pipeline, comprising a movable rotary ring (1), a fixed rotary ring (2), a front end cover (3), a push arm (12), a locking block (15), a shell (23) and a concave flange (32); the fixed rotary ring (2), the push arm (12) and the front end cover (3) are sequentially fixed to the front end of the shell (23) through locking studs (10), and the end portions of the locking studs (10) are threadedly connected with locking nuts (9); the movable rotary ring is sleeved between the front end face of the shell (23) and the fixed rotary ring (2); the shell (23) is provided with a through hole, and the front end of the through hole is provided with a stepped hole including a middle hole and a large hole; the middle hole is in gap cooperation with an original pipeline (4); the rear end of the push arm (12) extends into the large hole and is between the original pipeline (4); and the locking block (15) is sleeved between the rear end of the push arm (12) and the original pipeline (4).

[0005] Further, the movable rotary ring (1) and the fixed rotary ring (2) are configured in pairs, the opposite faces between the movable rotary ring (1) and the fixed rotary ring (2) are provided with a plurality of inclined surfaces configured in pairs and in interlocking cooperation, and the inner surface of the movable rotary ring (1) is a cylindrical surface and is in gap cooperation with a guide body arranged on the fixed rotary ring (2).

[0006] The inclined surfaces matched with the movable rotary ring (1) and the fixed rotary ring (2) are provided with sawtooth-shaped fine teeth.

[0007] The rear end of the shell (23) is provided with a convex flange (25) integrated with the shell (23), and the front end of the concave flange (32) is provided with a recessed conical surface, and the convex flange (25) is provided with a protruding conical surface matched with the recessed conical surface.

[0008] The distance between the end of the original pipeline (4) extending into the inside of the shell (23) and the rear end surface of the middle hole is greater than the dimension of the convex flange (25) extending into the inside of the concave flange (32).

[0009] Further, a gasket (11) is further included, which is sleeved between the push arm (12) and the locking nut (9), the thickness of the gasket (11) is greater than the moving distance of the push arm (12), the outer diameter is the same as the outer diameter of the front end body of the push arm (12), and the inner diameter is matched with the locking stud (10).

[0010] Further, an inner blocking ring (22), an inner sealing ring (21), a middle blocking ring (20), an outer sealing ring (19), an outer blocking ring (17) and a locking block blocking ring (16) are sequentially sleeved between the rear end surface of the large hole and the rear end surface of the locking block (15).

[0011] The outer circular surface of the outer sealing ring (19) and the middle blocking ring (20) is provided with a groove, and a certain number of through holes are arranged in the radial direction, and the pressure test holes are arranged corresponding to the groove position of the middle blocking ring (20) in the radial direction of the shell (23), and the oil injection holes are arranged corresponding to the groove position of the outer blocking ring (17).

[0012] The front end of the front end cover (3) is provided with a guide conical hole (8).

[0013] The inner wall of the front end cover (3) and the outer wall of the original pipeline (4), and the recessed conical surface of the concave flange (32) and the protruding conical surface of the convex flange (25) are provided with sealing rings, and the sealing rings are graphite materials.

[0014] The main sealing of the present application adopts graphite material to realize permanent sealing; the movable rotary ring and the fixed rotary ring are mainly used in cooperation with other structures, and can be applied to the seabed pipeline with large deformation; the convex flange and the concave flange are matched to improve the sealing performance and simplify the underwater construction requirements; the sealing studs and the locking studs are uniformly spaced and independently act, which improves the sealing and locking reliability and facilitates underwater installation operation; the whole device has the characteristics of large deformation capacity, convenient underwater installation tool operation, simple operation, reliable fixation and sealing, and no limitation of operation water depth. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a front view of a seabed pipeline underwater maintenance connecting device; Figure 2 It is a right view of a seabed pipeline underwater maintenance connecting device;Figure 3 Figure 1 is a left view of a subsea pipeline underwater repair connecting device; Figure 4 Figure 1 is a left view of a subsea pipeline underwater repair connecting device; Figure 2 is a sectional view of the subsea pipeline underwater repair connecting device; movable ring 1, fixed ring 2, front end cover 3, original pipeline 4, sealing nut 5, sealing stud 6, end cover sealing ring 7, guide cone hole 8, locking nut 9, locking stud 10, washer 11, push arm 12, outer sealing ring 13, lock block support ring 14, lock block 15, lock block stop ring 16, outer stop ring 17, sealing ring fixed edge 18, outer sealing ring 19, middle stop ring 20, inner sealing ring 21, inner stop ring 22, shell 23, rear end bolt 24, convex flange 25, rear outer sealing ring 26, rear outer sealing stop ring 27, front clasp ring 28, rear inner sealing ring 29, rear inner sealing stop ring 30, rear clasp ring 31, concave flange 32. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions of the embodiments of the present application clearer, the embodiments of the present application are described in detail below, examples of the embodiments are shown in the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Identical or similar reference numerals represent identical or similar elements or elements with identical or similar functions throughout the description. The elements with identical functions are only shown once with reference numerals, and the embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0017] Embodiment 1

[0018] The utility model relates to a kind of underwater maintenance connecting devices of submarine pipeline, by dynamic ring 1, fixed ring 2, front end cover 3, original pipeline 4, sealing nut 5, sealing stud 6, end cover sealing ring 7, guide cone hole 8, locking nut 9, locking stud 10, washer 11, push arm 12, outer sealing ring 13, lock block support ring 14, lock block 15, lock block stop ring 16, outer stop ring 17, sealing ring fixed edge 18, outer sealing ring 19, middle stop ring 20, inner sealing ring 21, inner stop ring 22, shell 23, rear end bolt 24, convex flange 25, rear outer sealing ring 26, rear outer sealing stop ring 27, front snap ring 28, rear inner sealing ring 29, rear inner sealing stop ring 30, rear snap ring 31, concave flange 32 are formed;Front of shell 23 is sequentially arranged with dynamic ring 1, fixed ring 2, front end cover 3, and rear end is sequentially arranged with convex flange 25, concave flange 32;Shell 23 is provided with through hole inside, and the diameter of through hole is same with the inner diameter of original pipeline 4, and the inside of front end is provided with stepped hole, middle hole is matched with the outer cylindrical surface of original pipeline 4, large hole is sequentially matched with inner stop ring 22, inner sealing ring 21, middle stop ring 20, outer sealing ring 19, outer stop ring 17, lock block stop ring 16, push arm 12, the outer cylindrical surface of the rear portion of front end cover 3, the front end surface of shell 23 is matched with the rear end surface of dynamic ring 1, is uniformly set on end surface along the circumferential direction perpendicular to end surface and with locking stud 10 and sealing stud 6 cooperation, the rear end of shell 23 is provided with convex flange 25 integrated with shell 23, and the outer surface of the portion of shell 23 before convex flange 25 is stepped cylindrical surface;Convex flange 25 is provided with the same through hole with shell 23, and the outer surface of front portion is square, and the outer surface of rear portion is sequentially provided with conical surface matched with the front end inside front section conical hole of concave flange 32, cylindrical surface matched with rear outer sealing ring 26, annular groove matched with rear outer sealing stop ring 27, cylindrical surface matched with front snap ring 28, conical surface matched with the front end inside rear section conical hole of concave flange 32, cylindrical surface matched with rear inner sealing ring 29, annular groove matched with rear inner sealing stop ring 30, cylindrical surface matched with rear snap ring 31, the through hole matched with the stud in rear end bolt 24 is set in the four corner positions of convex flange 25, the bolt of front end surface is matched with rear end bolt 24, and the front end surface is matched with the front end surface of concave flange 32.The inner part of the front end cover 3 is provided with a through hole and matches the outer cylindrical surface of the original pipe 4 with a gap, the front end of the through hole is provided with a taper hole 8 and a groove matched with the end cover sealing ring 7, the front outer surface of the front end cover 3 is a large cylindrical surface with the same diameter as the outer diameter of the largest cylindrical surface of the shell 23, the rear end is a cylinder and is connected with the lock block stop ring 16 as a whole, the cylinder is provided with a rectangular through hole matched with the lock block 15 and an arc groove matched with the push arm 12 in front of the lock block stop ring 16, the outer surface of the cylinder matches the inner hole of the shell 23, the inner hole matches the outer cylindrical surface of the original pipe 4 with a gap, the large cylindrical surface of the front end cover 3 is provided with a hole perpendicular to the end surface and matched with the cylinder on the push arm 11 and the sealing stud 6, the front end surface of the front end cover 3 matches the sealing nut 5, the rear end surface matches the fixed rotary ring 2 and the outer sealing ring 13, and the rear end surface of the lock block stop ring 16 matches the outer stop ring 17; the front end of the push arm 12 is a cylindrical cylinder, the rear end is an annular strip block, and the middle stand is connected into a whole, the inner hole of the front end cylinder matches the lock stud 10, the outer cylindrical surface matches the corresponding hole on the front end cover 3, the outer surface of the annular strip block is a circular arc and matches the corresponding hole on the shell 23, the inner surface is a circular arc, the front part matches the corresponding arc groove on the front end cover 3, the rear end is processed into a plurality of conical structures and matches the conical surface of the outer surface of the lock block 15, the side surface matches the corresponding groove on the front end cover 3, the dynamic rotary ring 1 and the fixed rotary ring 2 are arranged in pairs, the outer surfaces are cylindrical surfaces and match the outer sealing ring 13, the relative surfaces between the dynamic rotary ring 1 and the fixed rotary ring 2 are provided with a plurality of inclined structures arranged in pairs and matched with each other, the inner surface of the dynamic rotary ring 1 is a cylindrical surface and matches the guide body on the fixed rotary ring 2, the rear end surface matches the front end surface of the shell 23, the inner hole of the fixed rotary ring 2 matches the original pipe 4 with a gap, the front end surface matches the rear end surface of the front end cover 3, the fixed rotary ring 2 is provided with a through hole matched with the sealing stud 6 and a groove matched with the lock stud 10, the fixed rotary ring 2 is provided with a guide body matched with the dynamic rotary ring 1, and the fixed rotary ring 2 is fixed to the corresponding end surface of the front end cover 3; the lock block 15 is an annular cuboid structure, arranged in the rectangular through hole on the front end cover 3, the outer surface is arc-shaped and processed into a plurality of conical structures and matched with the push arm 12, the inner surface is arc-shaped, the two ends are respectively provided with grooves matched with the lock block support ring 14, and the middle part is provided with a triangular tooth matched with the original pipe 4; the outer stop ring 17, the middle stop ring 20 and the inner stop ring 22 are provided with a sealing ring fixed edge 18 on the side corresponding to the sealing ring; the concave flange 32 and the convex flange 25 are arranged in pairs, the front end of the concave flange 32 is square, the rear end is cylindrical, the inner part is provided with a through hole with the same inner diameter as the original pipe 4, the front end is provided with a stepped taper hole matched with the convex flange 25, the rear end is welded with a pipe, and the four corner positions of the concave flange 32 are provided with holes matched with the rear end bolt 24; the outer sealing ring 19 and the inner sealing ring 21 are made of graphite, the rear outer sealing stop ring 27 and the rear inner sealing ring 29 are made of stainless steel, the end cover sealing ring 7 and the outer sealing ring 13 are made of fluorine rubber.

[0019] The sawtooth fine teeth are arranged on the inclined surface of the movable rotary ring 1 and the fixed rotary ring 2. The distance between the end of the original pipeline 4 extending into the inside of the shell 23 and the rear end surface of the inner check ring 22 is greater than the size of the convex flange 25 extending into the inside of the concave flange 32. The thickness of the gasket 11 is greater than the moving distance of the push arm 12, the outer diameter is the same as the outer diameter of the front end body of the push arm 12, and the inner diameter is matched with the locking stud 10. The outer circular surface of the outer sealing ring 19 and the middle check ring 20 is provided with a groove, and a certain number of through holes are arranged in the radial direction. In the radial direction of the shell 23, a pressure test hole is arranged corresponding to the groove position of the middle check ring 20, and an oil injection hole is arranged corresponding to the groove position of the outer check ring 17.

[0020] Embodiment 2

[0021] A novel underwater maintenance connecting device for submarine pipeline, comprising a movable rotary ring (1), a fixed rotary ring (2), a front end cover (3), a push arm (12), a lock block (15), a shell (23), and a concave flange (32); the fixed rotary ring (2), the push arm (12), and the front end cover (3) are sequentially fixed to the front end of the shell (23) through a locking stud (10), and the end of the locking stud (10) is threadedly connected with a locking nut (9); the movable rotary ring is sleeved between the front end surface of the shell (23) and the fixed rotary ring (2); the shell (23) is provided with a through hole, and the front end of the through hole is provided with a stepped hole including a middle hole and a large hole; the middle hole is gap matched with an original pipeline (4); the rear end of the push arm (12) extends into the large hole and between the original pipeline (4); and the lock block (15) is sleeved between the rear end of the push arm (12) and the original pipeline (4).

[0022] The movable rotary ring (1) and the fixed rotary ring (2) are sleeve structures, and the inner surface of the movable rotary ring (1) is externally threaded and matched with the externally threaded surface arranged on the fixed rotary ring (2).

[0023] The rear end of the shell (23) is provided with a convex flange (25) integrated with the shell (23), the front end of the concave flange (32) is provided with a recessed conical surface, and the convex flange (25) is provided with a protruding conical surface matched with the recessed conical surface.

[0024] The distance between the end of the original pipeline (4) extending into the inside of the shell (23) and the rear end surface of the middle hole is greater than the size of the convex flange (25) extending into the inside of the concave flange (32).

[0025] Further comprising a gasket (11) sleeved between the push arm (12) and the locking nut (9), wherein the thickness of the gasket (11) is greater than the moving distance of the push arm (12), the outer diameter is the same as the outer diameter of the front end body of the push arm (12), and the inner diameter is matched with the locking stud (10).

[0026] The inner blocking ring (22), the inner sealing ring (21), the middle blocking ring (20), the outer sealing ring (19) and the outer blocking ring (17) are sequentially arranged between the rear end surface of the large hole and the rear end surface of the locking block (15).

[0027] The outer sealing ring (19) and the middle blocking ring (20) are provided with grooves and a plurality of through holes in the radial direction, and the pressure test hole is arranged corresponding to the groove position of the middle blocking ring (20) and the oil injection hole is arranged corresponding to the groove position of the outer blocking ring (17) in the radial direction of the shell (23).

[0028] The front end of the front end cover (3) is provided with a guide cone hole (8).

[0029] The inner wall of the front end cover (3) and the outer wall of the original pipeline (4), and the recessed conical surface of the concave flange (32) and the protruding conical surface of the convex flange (25) are provided with sealing rings.

[0030] Embodiment 3

[0031] A kind of underwater maintenance connecting device of submarine pipeline is composed of movable ring 1, fixed ring 2, front end cover 3, original pipeline 4, sealing nut 5, sealing stud 6, end cover sealing ring 7, guide cone hole 8, locking nut 9, locking stud 10, washer 11, push arm 12, outer sealing ring 13, locking block support ring 14, locking block 15, locking block blocking ring 16, outer blocking ring 17, sealing ring fixed edge 18, outer sealing ring 19, middle blocking ring 20, inner sealing ring 21, inner blocking ring 22, shell 23, rear end bolt 24, convex flange 25, rear outer sealing ring 26, rear outer sealing blocking ring 27, front clasp ring 28, rear inner sealing ring 29, rear inner sealing blocking ring 30, rear clasp ring 31, concave flange 32.

[0032] The function of the underwater maintenance connecting device for submarine pipeline is to realize the replacement of the pipe section of the repaired pipeline by reliable fixation and sealing with the original pipeline in a mechanical way. The specific operation process is as follows: assembly before submersion: the lock block 15, the push arm 12, the end cover sealing ring 7, the fixed rotating ring 2, the movable rotating ring 1, and the lock block support ring 14 are sequentially installed on the front end cover 3, and then the outer sealing ring 13 is installed on the fixed rotating ring 2 and the movable rotating ring 1; the inner blocking ring 22, the middle blocking ring 20, and the outer blocking ring 17 are respectively fixed to the sealing ring fixed edge 18 at the corresponding positions; the inner blocking ring 22, the inner sealing ring 21, the middle blocking ring 20, the outer sealing ring 19, and the outer blocking ring 17 are sequentially installed in the hole of the shell 23, and then the sealing stud 6 and the locking stud 10 are respectively installed on the shell 23; the front end cover 3 and the installed components are installed together in the hole of the shell 23; the gasket 11 is installed on the locking stud 10, and the sealing nut 5 and the locking nut 9 are respectively installed at the initial position; the rear outer sealing ring 26, the rear outer sealing blocking ring 27, the front clasp ring 28, the rear inner sealing ring 29, the rear inner sealing blocking ring 30, and the rear clasp ring 31 are sequentially installed on the convex flange 25 which is in an integral structure with the shell 23; the two ends of the newly replaced pipe section are respectively welded to the concave flange 32.

[0033] installation after submersion: one maintenance connecting device is installed on the original pipeline 4 through the guide cone hole 8, and another maintenance connecting device is also installed on the other end of the original pipeline 4, the original pipeline 4 is inserted into the bottom of the middle hole of the shell 23 which matches the outer diameter of the original pipeline 4, and the concave flange 32 at the two ends of the newly replaced pipe section is respectively centered with the axial center line and the bolt hole thereon of the two maintenance connecting devices; the concave flange 32 at one end of the newly replaced pipe section is connected with the convex flange 25 on the corresponding maintenance connecting device through the rear end bolt 24 and is tightened to a predetermined torque, so that the rear outer sealing blocking ring 27 and the rear inner sealing ring 29 respectively reach a predetermined stress and are sealed; all the sealing nuts 5 on the maintenance connecting device are uniformly tightened to a predetermined torque, the front end cover 3 is pressed tightly to a predetermined stress by the sealing nut 5, the movable rotating ring 1 is rotated so that the movable rotating ring 1 and the fixed rotating ring 2 are in close contact with the corresponding end faces of the shell 23 and the front end cover 3, and all the locking nuts 9 are uniformly tightened to a predetermined torque, so that the lock block 15 is clamped to the original pipeline 4 under the action of the push arm 12, and the installation of this end is completed; similarly, the concave flange 32 at the other end of the newly replaced pipe section is connected with the convex flange 25 on the other maintenance connecting device through the rear end bolt 24 and is tightened to a predetermined torque, all the sealing nuts 5 on the maintenance connecting device are uniformly tightened to a predetermined torque, the movable rotating ring 1 is rotated so that the movable rotating ring 1 and the fixed rotating ring 2 are in close contact with the corresponding end faces of the shell 23 and the front end cover 3, and all the locking nuts 9 are uniformly tightened to a predetermined torque, and the installation of this end is completed.

[0034] The sealing can be tested through the pressure testing hole on the shell 23 to see if it meets the requirements; the oil injection hole on the shell 23 can be used to inject oil to protect the related components from seawater corrosion after the maintenance connection device meets the operation requirements.

[0035] The sawtooth fine teeth are arranged on the inclined surfaces of the movable rotating ring 1 and the fixed rotating ring 2 to ensure self-locking after rotating at any angle and to ensure that the front end cover 3 does not cause the inner sealing ring 21 and the outer sealing ring 19 to change in stress when the lock nut 9 is screwed.

[0036] The end cover sealing ring 7 and the outer sealing ring 13 ensure that the oil injected into the shell 23 is not leaked.

[0037] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A new type of submarine pipeline underwater maintenance connection device, characterized in that it includes a movable The rotating ring (1), the fixed rotating ring (2), the front end cover (3), the push arm (12), the lock block (15), the shell (23), the concave flange (32); the fixed rotating ring (2), the push arm (12), the front end cover (3) are sequentially fixed to the front end of the shell (23) through the locking stud (10), and the end of the locking stud (10) is threadedly connected with the locking nut (9); the movable rotating ring is sleeved between the front end face of the shell (23) and the fixed rotating ring (2); the shell (23) is provided with a through hole, the front end of the through hole is provided with a stepped hole, and the stepped hole comprises a middle hole and a large hole; the middle hole is in gap cooperation with the original pipeline (4); the rear end of the push arm (12) extends into the large hole and between the original pipeline (4); the lock block (15) is sleeved between the rear end of the push arm (12) and the original pipeline (4); the movable rotating ring (1) and the fixed rotating ring (2) are configured in pairs, a plurality of inclined surfaces configured in pairs are arranged on the opposite surfaces between the movable rotating ring (1) and the fixed rotating ring (2) and are mutually toothed and engaged, the inner surface of the movable rotating ring (1) is a cylindrical surface and is in gap cooperation with the guide body arranged on the fixed rotating ring (2); the rear end of the shell (23) is provided with a convex flange (25) which is integrated with the shell (23), the front end of the concave flange (32) is provided with a recessed conical surface, and the convex flange (25) is provided with a protruding conical surface which is inserted and cooperated with the recessed conical surface; further comprising an inner retaining ring (22), an inner sealing ring (21), a middle retaining ring (20), an outer sealing ring (19), an outer retaining ring (17) and a lock block retaining ring (16) which are sequentially sleeved between the rear end face of the large hole and the rear end face of the lock block (15); sealing rings are arranged between the inner wall of the front end cover (3) and the outer wall of the original pipeline (4) and between the recessed conical surface of the concave flange (32) and the protruding conical surface of the convex flange (25), and the sealing rings are made of graphite.

2. A novel subsea pipeline underwater repair connection apparatus as claimed in claim 1, wherein, Sawtooth fine teeth are arranged on the inclined surfaces matched with the movable rotating ring (1) and the fixed rotating ring (2).

3. A novel subsea pipeline underwater repair connection apparatus as claimed in claim 1, wherein, The distance between the end of the original pipeline (4) extending into the inside of the shell (23) and the rear end face of the middle hole is greater than the dimension of the convex flange (25) extending into the inside of the concave flange (32).

4. A novel subsea pipeline underwater repair connection apparatus as claimed in claim 1, wherein, Further comprising a gasket (11) sleeved between the push arm (12) and the locking nut (9), the thickness of the gasket (11) is greater than the moving distance of the push arm (12), the outer diameter of the gasket (11) is the same as the outer diameter of the front end body of the push arm (12), and the inner diameter of the gasket (11) is matched with the locking stud (10).

5. A novel subsea pipeline underwater repair connection apparatus as claimed in claim 1, wherein, The outer circular faces of the outer sealing ring (19) and the middle retaining ring (20) are provided with grooves and a certain number of through holes in the radial direction, and pressure test holes are arranged corresponding to the groove positions of the middle retaining ring (20) and oil injection holes are arranged corresponding to the groove positions of the outer retaining ring (17) in the radial direction of the shell (23).

6. A novel subsea pipeline underwater repair connection apparatus as claimed in claim 1, wherein, The front end of the front end cover (3) is provided with a guide conical hole (8).

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