CN113915416B

CN113915416B - Fixing device and fixing method for loading and unloading main pipe of liquid cargo ship

Info

Publication number: CN113915416B
Application number: CN202111180994.6A
Authority: CN
Inventors: 张宁; 曹奔
Original assignee: Jiangnan Shipyard Group Co Ltd
Current assignee: Jiangnan Shipyard Group Co Ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2023-02-24
Anticipated expiration: 2041-10-11
Also published as: CN113915416A

Abstract

The invention provides a fixing device for a loading and unloading main pipe of a liquid cargo ship, which comprises a fixing support and a heat insulation pipe support, wherein the fixing support comprises a lower support and an upper support matched with the lower support, and the lower support and the upper support are matched to form a square mounting groove for accommodating the heat insulation pipe support; the square mounting groove is internally fixed with an upper limit piece, a lower limit piece, a left limit piece and a right limit piece; the upper limiting piece and the left limiting piece are arranged on the upper bracket, and the lower limiting piece and the right limiting piece are arranged on the lower bracket; the upper limiting piece, the lower limiting piece, the left limiting piece and the right limiting piece respectively comprise a first limiting plate and two second limiting plates arranged on the first limiting plate at intervals, and the second limiting plates and the first limiting plates are enclosed to form clamping grooves for limiting the axial movement of the heat insulation pipe bracket; the maintenance of the loading and unloading main pipe can be carried out only by dismantling the upper bracket; the fixed support composed of the upper support and the lower support is not easy to deform, and can transmit the external force borne by the loading and unloading main pipe to the ship body structure, so that the stress concentration is avoided.

Description

Fixing device and fixing method for loading and unloading main pipe of liquid cargo ship

Technical Field

The invention belongs to the technical field of pipeline fixing, and particularly relates to a fixing device and a fixing method for a loading and unloading main pipe of a liquid cargo ship.

Background

The loading and unloading main pipe is a pipeline connected with a liquid cargo pipe of the wharf when the liquid cargo ship loads and unloads LNG, and when liquid cargo needs to be loaded and unloaded, two ends of the conveying hose are respectively butted with the liquid cargo pipe on the wharf and the loading and unloading main pipe on the liquid cargo ship only through a mechanical conveying arm on the wharf. However, in the whole loading and unloading process, under the action of external factors such as wind waves, water flow, conveying hoses and mechanical conveying arms, the loading and unloading main pipe of the liquid cargo ship bears large external force, so that the loading and unloading main pipe is very easy to damage, and a fixed support is required to bear the external force and transmit the external force to the ship body structure.

In addition, due to the particularity of goods conveying, the loading and unloading main pipe needs to be maintained frequently, and the existing fixed support and the loading and unloading main pipe are generally fixedly connected and cannot be maintained; although some fixed supports adopt the hoop to fix the loading and unloading header pipe, the loading and unloading header pipe is convenient to disassemble and assemble, but the hoop has limited strength and is very easy to deform, and the loading and unloading header pipe cannot be stably supported.

Disclosure of Invention

In view of the above disadvantages of the prior art, an object of the present invention is to provide a fixing device and a fixing method for a loading and unloading main pipe of a liquid cargo ship, which have simple structure, are easy to disassemble and assemble, are not easy to deform, can stably support and transmit the stress of the loading and unloading main pipe, avoid the loading and unloading main pipe from being damaged by stress, and prolong the service life of the loading and unloading main pipe.

In order to achieve the above and other related objects, the present invention provides a fixing device for a loading and unloading main pipe of a liquid cargo ship, the fixing device comprising a fixing support and a heat insulation pipe support fixed on the loading and unloading main pipe, the fixing support comprising a lower support fixed on a deck and an upper support matched with the lower support, the lower support and the upper support being connected by a bolt, and the lower support and the upper support being matched to form a square mounting groove for accommodating the heat insulation pipe support; the outer profile of the cross section of the heat insulation pipe support is a regular polygon, the number of the sides of the regular polygon is a multiple of four, and the outer surface of the heat insulation pipe support comprises an upper horizontal plane, a lower horizontal plane, a left vertical plane and a right vertical plane; an upper limiting piece matched with the upper horizontal surface of the heat insulation pipe support, a lower limiting piece matched with the lower horizontal surface of the heat insulation pipe support, a left limiting piece matched with the left vertical surface of the heat insulation pipe support and a right limiting piece matched with the right vertical surface of the heat insulation pipe support are fixed in the square mounting groove; the upper limiting piece and the left limiting piece are arranged on the upper bracket, and the lower limiting piece and the right limiting piece are arranged on the lower bracket; the upper limiting piece, the lower limiting piece, the left limiting piece and the right limiting piece respectively comprise a first limiting plate and two second limiting plates arranged on the first limiting plate at intervals, and the second limiting plates are vertically arranged on the first limiting plate and form clamping grooves for limiting the axial movement of the heat insulation pipe bracket by enclosing with the first limiting plates; the first limiting plate of the upper limiting piece is matched with the first limiting plate of the lower limiting piece to limit the up-and-down movement of the heat insulation support pipe, and the first limiting plate of the left limiting piece is matched with the first limiting plate of the right limiting piece to limit the left-and-right movement of the heat insulation support pipe; in addition, the fixed support composed of the upper support and the lower support is not easy to deform and has high structural strength, the limit pieces matched with the upper support and the lower support can effectively limit the axial movement, the radial movement and the rotation of the heat insulation pipe bracket, thereby achieving the purpose of limiting the movement and the rotation of the loading and unloading main pipe, simultaneously, the external force borne by the loading and unloading main pipe can be transmitted to the fixed support and then to the ship structure, thereby avoiding the occurrence of stress concentration,

preferably, the heat insulation pipe bracket comprises a lower pipe bracket and an upper pipe bracket matched with the lower pipe bracket, semi-cylindrical grooves are oppositely arranged on the lower pipe bracket and the upper pipe bracket, and the two semi-cylindrical grooves are butted to form a main pipe installation groove for installing a loading and unloading main pipe; a positioning ring and a radial positioning piece are fixed on the outer wall of the loading and unloading main pipe; semi-annular grooves are oppositely formed in the lower pipe support and the upper pipe support, and the two semi-annular grooves are butted to form a positioning annular groove matched with the positioning ring; lower conduit saddle and top tube support go up and are provided with the locking groove relatively, and two locking groove butt joints form with radial positioning element complex radial positioning groove utilizes holding ring and radial positioning element on the loading and unloading house steward, realizes that loading and unloading house steward and thermal-insulated conduit saddle's dismantling is fixed, is convenient for change thermal-insulated conduit saddle or loading and unloading house steward alone, reduces the replacement cost.

Preferably, the included angle between the matching surface of the upper pipe support and the lower pipe support and the horizontal plane is 45 degrees, so that the lower pipe support and the lower limiting part are conveniently ensured to have enough contact surfaces, and the stability of the lower pipe support placed on the lower limiting part is ensured.

Preferably, a first positioning protrusion is arranged on the upper pipe support, and a first positioning groove matched with the first positioning protrusion is arranged on the lower pipe support; the lower pipe support is provided with a second positioning protrusion, the upper pipe support is provided with a second positioning groove matched with the second positioning protrusion, and the butt joint precision of the upper pipe support and the lower pipe support is improved.

Preferably, the lower bracket comprises a lower short leg, a lower long leg, a first cross beam and a second cross beam, the lower short leg and the lower long leg are arranged on the deck at intervals, the lower short leg and the lower long leg are connected through the first cross beam, a first connecting plate is fixed to the top of the lower short leg, and the mounting height of the first cross beam is lower than that of the first connecting plate; the right end of the second cross beam is fixed at the top of the lower long supporting leg, and the left end of the second cross beam is fixed with a second connecting plate; the upper bracket comprises upper short supporting legs and a third cross beam, the left end of the third cross beam is vertically fixed at the tops of the upper short supporting legs, a third connecting plate matched with the second connecting plate is arranged at the right end of the third cross beam, a fourth connecting plate matched with the first connecting plate is arranged at the bottom of the upper short supporting legs, the second connecting plate is connected with the third connecting plate through bolts, and the first connecting plate is connected with the fourth connecting plate through bolts so as to ensure the structural strength of the upper bracket and the lower bracket.

Preferably, the lower bracket comprises a longitudinal beam supported on the outer plate, further ensuring the stability of the fixing bracket.

Preferably, the outer surface of the heat insulation pipe bracket is coated with GPR glue, so that the smoothness of the outer surface of the heat insulation pipe bracket is guaranteed.

Preferably, be equipped with first clearance adjustment plate in the draw-in groove of last spacing piece and/or the draw-in groove of lower spacing piece, be equipped with second clearance adjustment plate in the draw-in groove of left side spacing piece and/or the draw-in groove of right spacing piece to supplementary the removal of restriction thermal-insulated conduit saddle reduces because of the clearance that processing and assembly error arouse.

Preferably, be equipped with the clamping jaw subassembly of centre gripping on the support on the first limiting plate, clamping jaw subassembly includes preceding clamping jaw and the back clamping jaw that the interval set up, preceding clamping jaw and back clamping jaw spot welding are both sides around the fixed bolster respectively, guarantee the joint strength of each locating part.

The invention also provides a fixing method of the loading and unloading main pipe of the liquid cargo ship, which adopts the fixing device to fix the loading and unloading main pipe of the liquid cargo ship and comprises the following steps:

s1, arranging a lower support on a deck at the position of a loading and unloading main pipe, and then placing a lower pipe support in a clamping groove of a lower limiting piece;

s2, placing the loading and unloading main pipe in the semi-cylindrical groove of the lower pipe support, aligning the positioning ring of the loading and unloading main pipe to the semi-annular groove on the lower pipe support and aligning the radial positioning piece of the loading and unloading main pipe to the stop groove on the lower pipe support during placement;

s3, installing a pipe bracket;

and S4, installing an upper support, and fixing the upper support and the lower support through bolts.

As described above, the fixing device and the fixing method for the loading and unloading main pipe of the liquid cargo ship have the following beneficial effects:

(1) The fixing device for the loading and unloading main pipe of the liquid cargo ship is simple in structure, not easy to deform, high in structural strength, capable of stably supporting and transmitting the stress of the loading and unloading main pipe, capable of avoiding the loading and unloading main pipe from being damaged due to stress and capable of prolonging the service life of the loading and unloading main pipe;

(2) Because the upper bracket and the lower bracket are detachably fixed, and the upper bracket and the lower bracket can be separately matched, the disassembly and assembly difficulty is greatly reduced, and a user can conveniently overhaul, maintain and assemble the loading and unloading main pipe;

(3) Due to the arrangement of the heat insulation pipe supports, the temperature of the effective fixing support is transmitted to the loading and unloading main pipe, and the low-temperature conveying of liquid goods is guaranteed.

Drawings

FIG. 1 is a perspective view of a first perspective of the use of the present invention to secure a loading manifold.

Fig. 2 is a perspective view from a second perspective of the mounting manifold secured using the securing device of the present invention.

Fig. 3 is a front view of a loading manifold secured using the securing device of the present invention.

Fig. 4 is an exploded view of fig. 1.

Fig. 5 is a schematic view of a limiting member.

Description of the reference numerals

The lower support 1a, the upper support 1b, the lower short leg 11, the first connecting plate 111, the lower long leg 12, the first beam 13, the second beam 14, the second connecting plate 141, the upper short leg 15, the fourth connecting plate 151, the third beam 16, the third connecting plate 161, the longitudinal beam 17, the loading and unloading header pipe 2, the positioning ring 21, the radial positioning member 22, the heat insulation pipe bracket 3, the lower pipe bracket 3a, the upper pipe bracket 3b, the semi-cylindrical groove 31, the semi-annular groove 32, the locking groove 33, the upper positioning member 4a, the lower positioning member 4b, the left positioning member 4c, the right positioning member 4d, the first limiting plate 41, the second limiting plate 42, the front jaw 431, the rear jaw 432, the first clearance adjusting plate 44, and the second clearance adjusting plate 45.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

Please refer to fig. 1 to 5. It should be understood that the structures, ratios, sizes, etc. shown in the drawings and attached to the description are only for understanding and reading the disclosure of the present invention, and are not intended to limit the practical conditions of the present invention, so that the present invention has no technical significance, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should still fall within the scope of the technical contents of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms may be changed or adjusted without substantial change in the technical content.

As shown in fig. 1 to 5, the present invention provides a fixing device for a loading and unloading main pipe of a liquid cargo ship, which comprises a fixing support and a heat insulation pipe bracket 3 fixed on the outer wall of the loading and unloading main pipe 2, wherein the fixing support comprises a lower support 1a fixed on a deck and an upper support 1b matched with the lower support 1a, the lower support 1a and the upper support 1b are connected through a bolt, and the lower support 1a and the upper support 1b are matched to form a square mounting groove for accommodating the heat insulation pipe bracket 3; the outer profile of the cross section of the heat-insulation pipe support 3 is a regular polygon, the number of sides of the regular polygon is a multiple of four, and the outer surface of the heat-insulation pipe support 3 comprises an upper horizontal plane, a lower horizontal plane, a left vertical plane and a right vertical plane; an upper limiting piece 4a matched with the upper horizontal plane of the heat insulation pipe support 3, a lower limiting piece 4b matched with the lower horizontal plane of the heat insulation pipe support 3, a left limiting piece 4c matched with the left vertical plane of the heat insulation pipe support 3 and a right limiting piece 4d matched with the right vertical plane of the heat insulation pipe support 3 are fixed in the square mounting groove; the upper limiting piece 4a and the left limiting piece 4c are arranged on the upper bracket 1b, and the lower limiting piece 4b and the right limiting piece 4d are arranged on the lower bracket 1 a; the upper limiting piece 4a, the lower limiting piece 4b, the left limiting piece 4c and the right limiting piece 4d respectively comprise a first limiting plate 41 and two second limiting plates 42 arranged on the first limiting plate 41 at intervals, and the second limiting plates 42 are vertically arranged on the first limiting plate 41 and form clamping grooves for limiting the axial movement of the heat insulation pipe bracket 3 in a surrounding manner with the first limiting plate 41; the first limiting plate 41 of the upper limiting piece 4a and the first limiting plate 41 of the lower limiting piece 4b are matched to limit the up-and-down movement of the heat insulation support pipe 3, and the first limiting plate 41 of the left limiting piece 4c and the first limiting plate 41 of the right limiting piece 4d are matched to limit the left-and-right movement of the heat insulation support pipe 3, so that the heat insulation pipe support 3 is prevented from moving and rotating in the square mounting groove; in the present embodiment, the outer profile of the cross section of the heat insulation pipe bracket 3 is a regular octagon.

It can be understood that, in order to better limit the position of the heat insulation pipe bracket 3, a first gap adjusting plate 44 is arranged in the clamping groove of the upper limiting member 4a and/or the clamping groove of the lower limiting member 4b, and a second gap adjusting plate 45 is arranged in the clamping groove of the left limiting member 4c and/or the clamping groove of the right limiting member 4 d.

As shown in fig. 1 to 4, the lower bracket 1a includes a lower short leg 11, a lower long leg 12, a first beam 13 and a second beam 14, the lower short leg 11 and the lower long leg 12 are arranged on the deck at intervals, the lower short leg 11 and the lower long leg 12 are vertically connected by the first beam 13 to form an h-shaped bracket, a first connecting plate 111 is fixed to the top of the lower short leg 11, and the mounting height of the first beam 13 is lower than that of the first connecting plate 111; the right end of the second beam 14 is fixed on the top of the lower long leg 12, and the left end of the second beam 14 is fixed with a second connecting plate 141; the upper bracket 1b comprises an upper short leg 15 and a third beam 16, the left end of the third beam 16 is vertically fixed on the top of the upper short leg 15, the right end of the third beam 16 is provided with a third connecting plate 161 matched with a second connecting plate 141, the bottom of the upper short leg 15 is provided with a fourth connecting plate 151 matched with the first connecting plate 111, the second connecting plate 141 and the third connecting plate 161 are connected through bolts, and the first connecting plate 111 and the fourth connecting plate 151 are connected through bolts; the lower short supporting leg 11, the upper short supporting leg 15, the second cross beam 14, the third cross beam 16 and the lower long supporting leg 12 together form a door-shaped support.

It will be appreciated that the lower bracket 1a includes stringers 17 supported on the outer panels in order to further ensure the strength and stability of the fixing device.

Specifically, as shown in fig. 1, the upper stopper 4a is fixed to the bottom of the third cross member 16, the lower stopper 4b is fixed to the top of the first cross member 13, and the lower stopper 4b and the upper stopper 4a are disposed opposite to each other in the up-down direction; the left limiting part 4c is fixed on the right side of the upper short supporting leg 15, the right limiting part 4d is fixed on the left side of the lower long supporting leg 12, and the right limiting part 4d and the left limiting part 4c are arranged in the left-right direction relatively, so that the movement and the rotation of the heat insulation pipe bracket 3 are limited through the upper limiting part, the lower limiting part, the left limiting part and the right limiting part, and the supporting stability of the heat insulation pipe bracket 3 is guaranteed.

It can be understood that the heat insulation module 3 has two structures, the first structure is that the heat insulation module 3 is an integral structure integrally welded on the outer wall of the loading and unloading main pipe 2; the second structure is that the split structure of the upper pipe bracket and the lower pipe bracket is adopted to be spliced and butted on the outer wall of the loading and unloading main pipe 2, and the axial limit structure and the radial limit structure are matched to limit the movement and the rotation of the loading and unloading main pipe 2; the present embodiment is preferably arranged in a second configuration to facilitate separation of the thermal insulation module 3 from the loading and unloading manifold 2.

When the second structure is adopted, as shown in fig. 1 to 4, the heat insulation pipe bracket 3 comprises a lower pipe bracket 3a and an upper pipe bracket 3b matched with the lower pipe bracket 3a, semi-cylindrical grooves 31 are oppositely arranged on the lower pipe bracket 3a and the upper pipe bracket 3b, and the semi-cylindrical grooves 31 are butted to form a circular mounting cavity for mounting the loading and unloading main pipe 2; a positioning ring 21 and a radial positioning piece 22 are fixed on the outer wall of the loading and unloading main pipe 2; the lower pipe support 3a and the upper pipe support 3b are relatively provided with semi-annular grooves 32, and the semi-annular grooves 32 are butted to form positioning annular grooves matched with the positioning rings 21 so as to limit the axial movement of the loading and unloading main pipe 2; the matching surfaces of the lower pipe support 3a and the upper pipe support 3b are oppositely provided with stop grooves 33, and the two stop grooves 33 are butted to form radial positioning grooves matched with the radial positioning pieces 22 so as to limit the rotation of the loading and unloading main pipe 2.

It will be understood that the loading and unloading manifold 2 is provided with one radial positioning element 22 or two radial positioning elements 22, which is not limited to this, and the present embodiment is preferably provided with two radial positioning elements 22, and the two radial positioning elements 22 are arranged symmetrically with respect to the axial centerline of the loading and unloading manifold 2.

It is understood that the lower and

upper brackets

3a and 3b are made of gel coat, flame retardant resin, fiberglass cloth, and mesh cloth, and the outer surfaces of the lower and

upper brackets

3a and 3b are coated with GPR glue to ensure smoothness.

It is understood that the matching surface between the upper pipe support 3b and the lower pipe support 3a forms an included angle with the horizontal plane of not more than 67.5 degrees, which is not limited to this, and the present embodiment is preferably set to 45 degrees.

It can be understood that, in order to ensure the butting precision, the upper pipe support 3b is provided with a first positioning protrusion and/or a second positioning groove, and the lower pipe support 3a is provided with a first positioning groove and/or a second positioning protrusion which are matched with the first positioning protrusion and/or the second positioning groove.

As shown in fig. 4 and 5, be equipped with the clamping jaw assembly that can centre gripping on fixed bolster 1 on the first limiting plate 41, the clamping jaw assembly includes preceding clamping jaw 431 and the back clamping jaw 432 that the interval set up, preceding clamping jaw 431 and back clamping jaw 432 spot-weld respectively in the front and back both sides of fixed bolster 1, both guarantee joint strength, the later stage of being convenient for again is demolishd and is changed.

The invention provides a method for fixing a loading and unloading main pipe of a liquid cargo ship, which adopts the fixing device to fix the loading and unloading main pipe of the liquid cargo ship and comprises the following steps:

s1, arranging a lower support 1a on a deck at the position of a loading and unloading main pipe 2, and then placing a lower pipe support 3a in a clamping groove of a lower limiting piece 4 b;

s2, placing the loading and unloading main pipe 2 in the semi-cylindrical groove 31 of the lower pipe support 3a, aligning the positioning ring 21 of the loading and unloading main pipe 2 with the semi-annular groove 32 on the lower pipe support 3a and aligning the radial positioning piece 22 of the loading and unloading main pipe 2 with the stop groove 33 on the lower pipe support 3a during placement;

s3, installing a pipe bracket 3b;

and S4, installing an upper support 1b, and fixing the upper support 1b and the lower support 1a through bolts.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The fixing device for the loading and unloading main pipe of the liquid cargo ship is characterized by comprising a fixing support and a heat insulation pipe support (3) fixed on the loading and unloading main pipe (2), wherein the fixing support comprises a lower support (1 a) fixed on a deck and an upper support (1 b) matched with the lower support (1 a), the lower support (1 a) is connected with the upper support (1 b) through bolts, and the lower support (1 a) is matched with the upper support (1 b) to form a square mounting groove for accommodating the heat insulation pipe support (3); the outer contour of the cross section of the heat insulation pipe support (3) is a regular polygon, the number of sides of the regular polygon is a multiple of four, and the outer surface of the heat insulation pipe support (3) comprises an upper horizontal plane, a lower horizontal plane, a left vertical plane and a right vertical plane; an upper limiting piece (4 a) matched with the upper horizontal surface of the heat insulation pipe bracket (3), a lower limiting piece (4 b) matched with the lower horizontal surface of the heat insulation pipe bracket (3), a left limiting piece (4 c) matched with the left vertical surface of the heat insulation pipe bracket (3) and a right limiting piece (4 d) matched with the right vertical surface of the heat insulation pipe bracket (3) are fixed in the square mounting groove; the upper limiting piece (4 a) and the left limiting piece (4 c) are arranged on the upper bracket (1 b), and the lower limiting piece (4 b) and the right limiting piece (4 d) are arranged on the lower bracket (1 a); the upper limiting piece (4 a), the lower limiting piece (4 b), the left limiting piece (4 c) and the right limiting piece (4 d) respectively comprise a first limiting plate (41) and two second limiting plates (42) arranged on the first limiting plate (41) at intervals, and the second limiting plates (42) are vertically arranged on the first limiting plate (41) and form clamping grooves used for limiting the axial movement of the heat insulation pipe support (3) in a surrounding manner with the first limiting plate (41); the first limiting plate (41) of the upper limiting piece (4 a) and the first limiting plate (41) of the lower limiting piece (4 b) are matched to limit the heat insulation support pipe (3) to move up and down, and the first limiting plate (41) of the left limiting piece (4 c) and the first limiting plate (41) of the right limiting piece (4 d) are matched to limit the heat insulation support pipe (3) to move left and right; the lower support (1 a) comprises a lower short leg (11), a lower long leg (12), a first cross beam (13) and a second cross beam (14), the lower short leg (11) and the lower long leg (12) are arranged on a deck at intervals, the lower short leg (11) and the lower long leg (12) are connected through the first cross beam (13), a first connecting plate (111) is fixed to the top of the lower short leg (11), and the mounting height of the first cross beam (13) is lower than that of the first connecting plate (111); the right end of the second cross beam (14) is fixed at the top of the lower long supporting leg (12), and the left end of the second cross beam (14) is fixed with a second connecting plate (141); the upper bracket (1 b) comprises upper short supporting legs (15) and a third cross beam (16), the left end of the third cross beam (16) is vertically fixed at the top of the upper short supporting legs (15), the right end of the third cross beam (16) is provided with a third connecting plate (161) matched with a second connecting plate (141), the bottom of the upper short supporting legs (15) is provided with a fourth connecting plate (151) matched with a first connecting plate (111), the second connecting plate (141) is connected with the third connecting plate (161) through bolts, and the first connecting plate (111) is connected with the fourth connecting plate (151) through bolts.

2. The fixing device for the loading and unloading main pipe of the liquid cargo ship is characterized in that the heat insulation pipe bracket (3) comprises a lower pipe bracket (3 a) and an upper pipe bracket (3 b) matched with the lower pipe bracket (3 a), semi-cylindrical grooves (31) are oppositely arranged on the lower pipe bracket (3 a) and the upper pipe bracket (3 b), and the semi-cylindrical grooves (31) are butted to form a circular mounting cavity for mounting the loading and unloading main pipe (2); a positioning ring (21) and a radial positioning piece (22) are fixed on the outer wall of the loading and unloading main pipe (2); semi-annular grooves (32) are oppositely formed in the lower pipe support (3 a) and the upper pipe support (3 b), and the two semi-annular grooves (32) are butted to form a positioning annular groove matched with the positioning ring (21); the lower pipe support (3 a) and the upper pipe support (3 b) are oppositely provided with stop grooves (33), and the two stop grooves (33) are butted to form a radial positioning groove matched with the radial positioning piece (22).

3. The fixing device for the loading and unloading main pipe of the liquid cargo ship is characterized in that the angle between the horizontal plane and the matching surface of the upper pipe support (3 b) and the lower pipe support (3 a) is 45 degrees.

4. The fixing device for the loading and unloading main pipe of the liquid cargo ship according to claim 2, wherein the upper pipe bracket (3 b) is provided with a first positioning protrusion, and the lower pipe bracket (3 a) is provided with a first positioning groove matched with the first positioning protrusion; the lower pipe support (3 a) is provided with a second positioning protrusion, and the upper pipe support (3 b) is provided with a second positioning groove matched with the second positioning protrusion.

5. A securing arrangement for a loading and unloading manifold of a tanker according to claim 2, characterized in that the lower brackets (1 a) comprise stringers (17) supported on outer plates.

6. The mounting arrangement for the loading and unloading trunk of a tanker according to claim 1, characterized in that the outer surface of the thermally insulated pipe brackets (3) is coated with GPR glue.

7. A coupler assembly manifold fixing device according to claim 1, wherein a first gap adjusting plate (44) is arranged in the slot of the upper limiting member (4 a) and/or the slot of the lower limiting member (4 b), and a second gap adjusting plate (45) is arranged in the slot of the left limiting member (4 c) and/or the slot of the right limiting member (4 d).

8. The fixing device for the loading and unloading main pipe of the liquid cargo ship is characterized in that a clamping jaw assembly capable of being clamped on the fixing support (1) is arranged on the first limiting plate (41), the clamping jaw assembly comprises a front clamping jaw (431) and a rear clamping jaw (432) which are arranged at intervals, and the front clamping jaw (431) and the rear clamping jaw (432) are respectively spot-welded on the front side and the rear side of the fixing support (1).

9. A method of securing a tanker loading main pipe to a tanker using the securing device of claim 2 or claim 3 or claim 4 or claim 5, comprising the steps of:

s1, arranging a lower support (1 a) on a deck at the position of a loading and unloading main pipe (2), and then placing a lower pipe support (3 a) in a clamping groove of a lower limiting piece (4 b);

s2, placing the loading and unloading header pipe (2) in the semi-cylindrical groove (31) of the lower pipe bracket (3 a), aligning a positioning ring (21) of the loading and unloading header pipe (2) to a semi-annular groove (32) on the lower pipe bracket (3 a) and aligning a radial positioning piece (22) of the loading and unloading header pipe (2) to a stop groove (33) on the lower pipe bracket (3 a) during placement;

s3, mounting a pipe bracket (3 b);

and S4, installing an upper support (1 b), and fixing the upper support (1 b) and the lower support (1 a) through bolts.