CN111022796A

CN111022796A - Bolt with tensioning function and sea pipe flange connecting structure

Info

Publication number: CN111022796A
Application number: CN201911249198.6A
Authority: CN
Inventors: 齐兵兵; 曲有杰; 林守强; 朱国侨; 张忠扬; 赵拥军; 段亚辉
Original assignee: Shenzhen Offshore Oil Engineering Underwater Technology Co ltd
Current assignee: Shenzhen Offshore Oil Engineering Underwater Technology Co ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-04-17

Abstract

The invention discloses a bolt with a tensioning function and a marine pipe flange connecting structure, wherein the bolt with the tensioning function comprises a rod piece, a hydraulic driving assembly, a first locking nut and a second locking nut; the rod piece comprises a first end and a second end which are opposite and are provided with threads, a first locking nut is matched on the first end through the threads, and a second locking nut is matched on the second end through the threads; the hydraulic driving assembly is matched on the rod piece and located on one side, facing the first locking nut, of the second locking nut and used for generating axial force to tighten the rod piece through the second locking nut, and therefore the rod piece generates axial tension. The bolt with the tensioning function has the tensioning function, and can be used for tensioning the rod piece through hydraulic driving while locking, so that the rod piece is elastically deformed to a certain extent, an axial tensioning force is generated, and high-strength locking is realized. The flange joint is applied to the flange joint of a sea pipe, can be operated and installed by an ROV (remote operated vehicle), and solves the problem of flange joint locking in the deep water field of more than 300 meters.

Description

Bolt with tensioning function and sea pipe flange connecting structure

Technical Field

The invention relates to a bolt, in particular to a bolt with a tensioning function and a marine pipe flange connecting structure.

Background

In recent years, the number of deepwater marine pipes is increasing, and accidents of marine pipe damage are more and more frequent due to the long years of marine pipe design and construction, pipeline corrosion, towing of trawlers and the like. Once the sea pipe is damaged, the sea pipe brings huge threats to the production of marine environment and oil and gas fields. The maintenance mode of the submarine pipeline accompanied by the sudden damage of the submarine pipeline is generally to replace the submarine pipeline at the damaged section, and the connection between a new submarine pipeline and an old submarine pipeline is flange connection after the submarine pipeline is replaced.

In order to reduce the huge economic loss such as marine environmental pollution and crude oil production stoppage, safe, quick and reliable replacement of damaged pipelines is particularly important. However, the maintenance and replacement of the deepwater marine pipe are difficult, and the cost is several times higher than that of the deepwater marine pipe. Therefore, the corresponding emergency maintenance scheme is researched aiming at the damage problem of the deepwater sea pipe, and the development of matched maintenance and replacement equipment has important significance for guaranteeing the safe production of the oil and gas field.

For guaranteeing the firmness and stability of the connection of the submarine pipeline flange, on the basis of locking the bolt of the connection flange, the axial tensioning of the bolt needs to be carried out to ensure that the bolt generates tensile elastic deformation, then the locking nut enables the bolt to keep a deformation state, and the contraction force of the bolt can ensure that the flange can realize the high-strength locking submarine pipeline.

The existing method for connecting the marine pipe flange is to adopt a common full-thread stud to penetrate through a flange bolt hole, lock nuts at two ends of the stud respectively, and then install a bolt tensioning tool on each bolt to tension the bolt, wherein the installation process is extremely complex and needs to be operated by a diver, the working efficiency is low, and the marine pipe flange cannot be used in deep water areas of more than 300 meters.

Disclosure of Invention

The invention aims to provide a bolt with a tensioning function for marine pipe flange connection and a marine pipe flange connection structure using the bolt.

The technical scheme adopted by the invention for solving the technical problems is as follows: the bolt with the tensioning function comprises a rod piece, a hydraulic driving assembly, a first locking nut and a second locking nut;

the rod piece comprises a first end and a second end which are opposite and are provided with threads, the first locking nut is matched on the first end through the threads, and the second locking nut is matched on the second end through the threads;

the hydraulic driving assembly is matched on the rod piece and located on one side, facing the first locking nut, of the second locking nut and used for tensioning the rod piece to enable the rod piece to generate an axial tension force.

Preferably, the hydraulic driving assembly comprises a housing sleeved on the rod member, and a piston arranged in the housing, matched with the rod member and driven by hydraulic pressure to move axially along the rod member;

and a step surface used for being in contact with the piston is arranged at the second end of the rod piece.

Preferably, an annular bulge is arranged on the second end of the rod piece, and the thread on the second end is arranged on the annular bulge;

the end surface of the annular protrusion facing the first end forms the step surface.

Preferably, the hydraulic drive assembly further comprises sealing rings respectively arranged at the matching position of the housing and the rod, between the outer periphery of the piston and the inner wall of the housing, and between the inner periphery of the piston and the outer periphery of the rod.

Preferably, the housing is provided with at least one hydraulic oil passage port communicated to the inner space thereof.

Preferably, the housing comprises a cylinder, an end plate fitted at one end of the cylinder, the opposite end of the cylinder forming an open end; the end plate is provided with a through hole which is matched with the rod body and is communicated with the inner space of the cylinder body;

on the rod piece, the end plate faces to the first end of the rod piece, and the opening end of the cylinder body is matched with the annular bulge.

Preferably, the hydraulic drive assembly further comprises a retainer ring; the baffle ring is arranged between the periphery of the annular bulge and the opening end of the cylinder body.

Preferably, the first end of the rod piece extends outwards and axially to form a guide section; the guide section has an outer diameter less than an outer diameter of the first end.

The invention also provides a marine pipe flange connecting structure, which comprises two flanges and at least one bolt, wherein the two flanges are respectively arranged on the end parts of the marine pipe and are matched oppositely;

the first end of a rod piece of the bolt penetrates through the two flanges, and the first locking nut and the second locking nut are respectively matched on the first end and the second end of the rod piece and are respectively positioned on the opposite sides of the two flanges; and the hydraulic driving assembly of the bolt is positioned between the second locking nut and the corresponding flange, and provides hydraulic driving force to enable the rod piece to generate axial tension force to tighten the flange.

Preferably, the marine pipe flange connection structure comprises a plurality of said bolts; and a plurality of bolts are distributed at intervals along the circumferential direction of the flanges and locked on the two flanges.

The bolt with the tensioning function has the tensioning function, and can be used for tensioning the rod piece through hydraulic driving while locking, so that the rod piece is elastically deformed to a certain extent, an axial tensioning force is generated, and high-strength locking is realized. The bolt with the tensioning function is applied to the flange connection of a sea pipe, and the flange is tensioned through the generated axial tensioning force, so that the bolt can be operated and installed by an ROV (remote operated vehicle), and the problem of flange connection locking in the deep water field of more than 300 meters is solved.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic structural view of a marine pipe flange connection structure according to an embodiment of the present invention;

FIG. 2 is a schematic sectional view of a part of a flange connection structure of a marine vessel according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a bolt with a tensioning function according to an embodiment of the invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, the marine pipe flange connection structure according to an embodiment of the present invention includes two flanges 10 respectively disposed on the ends of a marine pipe 1 and engaged with each other, and at least one bolt 20. The bolts 20 are used to lock the two flanges 10 that are mated with each other, thereby achieving the connection of the marine pipe 1.

The flange 10 is provided with a plurality of bolt holes (not shown) distributed along the circumferential direction at intervals, the bolt holes of the two flanges 10 are communicated with each other, and the bolts 20 are inserted into the opposite bolt holes to lock the two flanges 10.

As shown in fig. 2 and 3, the bolt 20 includes a rod 21, a hydraulic drive assembly 22, a first lock nut 23, and a second lock nut 24. The rod member 21 includes opposite first and second ends on which threads 211, 212 (external threads) are provided, respectively. A first lock nut 23 is threadedly engaged on a first end of the rod 21 and a second lock nut 24 is threadedly engaged on a second end of the rod 21. A hydraulic drive assembly 22 is fitted on the rod 21 on the side of the second lock nut 24 facing the first lock nut 23 for tensioning the rod 21 to generate an axial tension in the rod 21.

In the marine pipe flange connection structure, a first end of a rod 21 of a bolt 20 passes through two flanges 10, a first lock nut 23 and a second lock nut 24 are respectively fitted on the first end and the second end of the rod 21 and are respectively located on opposite sides of the two flanges 10, and the two flanges 10 are locked together by abutting against the surfaces of the flanges 10. The hydraulic drive assembly 22 is located between the second lock nut 24 and a corresponding one of the flanges 10, and provides a hydraulic drive force to axially tension the rod 21 and tighten the flange 10.

Specifically, the outer diameter of the first end of the rod 21 is correspondingly matched with the inner diameter of the bolt hole of the flange 10. The thread 211 may be provided only on a part of the first end remote from the second end for engagement by the first locking nut 23, or may extend axially over the entire first end. A guide section 25 is formed by extending the first end of the rod piece 21 outwards and axially; the guide section 25 has an outer diameter smaller than that of the first end and serves to guide the rod member 21 into the bolt hole. The guide section 25 may have a tapered shape or a stepped cylindrical shape as shown in fig. 2.

Hydraulic drive assembly 22 may include a housing 221 and a piston 222. The casing 221 is a cylindrical structure, and is fitted over the rod 21 to form a space with the rod 21. The piston 222 is disposed in the housing 221 and fitted on the rod member 21 in a space formed by the rod member 21 and the housing 221, and the piston 222 is hydraulically driven to move axially along the rod member 21.

The second end of the rod 21 is provided with a step surface 213 for contacting with the piston 222, and the piston 222 can move back and forth along the rod 21 axially and press against the step surface 213 after being driven by hydraulic pressure in the housing 221, so as to drive the rod 21 to generate a certain elastic deformation and generate an axial tension.

In this embodiment, the second end of the rod 21 is provided with an annular protrusion 214, and the thread 212 on the second end is provided on the annular protrusion 214; the end surface of the annular projection 214 facing the first end of the stem 21 forms a step surface 213. The second end of the rod member 21 is provided with an annular projection 214 having an outer diameter greater than that of the first end, and a stepped surface 213 forms a connecting transition surface therebetween. An annular projection 214 is integrally formed on the second end.

At least one hydraulic oil passage port 223 communicated with the inner space of the housing 221 is provided on the housing 221 for inputting hydraulic oil into the housing 221 to drive the piston 222 to move back and forth.

Further, the housing 221 may include a cylinder 2212, an end plate 2211 fitted at one end of the cylinder 2212. End plate 2212 closes one end of cylinder 2212, while the opposite end of cylinder 2212 forms an open end. The end plate 2211 is provided with a through hole (not shown) communicating with the inner space of the cylinder 2212, the through hole is adapted to the rod 21 for the rod 21 to pass through.

The housing 221 is fitted to the outer periphery of the rod member 21 by means of a bushing. On the rod 21, the end plate 2211 faces the first end of the rod 21, and the open end of the cylinder 2212 is fitted with the annular projection 214. The step surface 213 is in the housing 221 to abut the piston 222.

Hydraulic drive assembly 22 also includes a blocker ring 224; a stop ring 224 is disposed between the outer periphery of the annular projection 214 and the open end of the cylinder 2212 and primarily limits the movement of the piston 222. The stop ring 224 and the open end of the cylinder 2212 can be in threaded fit, that is, the stop ring 224 is provided with external threads, and the open end of the cylinder 2212 is provided with internal threads.

In order to ensure the sealing of the matching parts, the hydraulic drive assembly 22 further comprises sealing

rings

225, 226 and 227 respectively arranged at the matching parts of the shell 221 and the rod 21, between the outer periphery of the piston 222 and the inner wall of the shell 221, and between the inner periphery of the piston 222 and the outer periphery of the rod 21, so that the whole hydraulic oil circuit has good sealing performance.

The sealing ring 225 is disposed between the inner periphery of the through hole of the end plate 2211 and the outer periphery of the corresponding rod 21, so as to ensure the sealing between the housing 221 and the rod 21. A seal ring 226 is provided between the outer periphery of the piston 222 and the inner wall of the cylinder 2212, ensuring a seal between the piston 222 and the housing 221. The seal 227 is provided between the inner hole wall surface of the piston 222 and the outer periphery of the rod 21, and ensures sealing between the piston 222 and the rod 21.

It is to be understood that the number of the seal rings provided in the above-described places is not limited to one.

As also shown in fig. 1 and 2, the marine pipe flange connection structure of the present embodiment includes a plurality of bolts 20; a plurality of bolts 20 are circumferentially spaced along the flanges 10 and are locked to both flanges 10.

When the deep water flange connection device is used for deep water flange connection, firstly, bolt holes of two flanges 10 are communicated in an aligned mode, the two flanges 10 are matched oppositely to form a flange group, a first end of a rod piece 21 penetrates through the bolt holes of the two flanges 10 to the end portion of the rod piece to extend out of one side of the flange group, and a shell 221 on a second end of the rod piece 21 is abutted to the other side of the flange group. The ROV then operates to install a first lock nut 23 on the first end and lock onto one side of the flange set. The ROV connects a hydraulic pipeline to a hydraulic oil line interface 223 on the shell 221, hydraulic oil enters the shell 221, the piston 222 is driven by hydraulic pressure to axially displace and extrude the rod 21, the rod 21 is pressed to axially tension the flange 10, and meanwhile, the rod 21 elastically deforms to generate axial tension. At this time, the rod 21 keeps the deformation state continuously by keeping the hydraulic power unchanged, and the ROV rotates the second lock nut 24 to be attached to the housing 221 by using an installation tool, so as to complete one tensioning action. And then the ROV adjusts and increases the hydraulic power input, and the tensioning action is repeated until the pressure value reaches the preset pressure value. And finally, the installation of the tensioning bolt is completed.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The bolt with the tensioning function is characterized by comprising a rod piece, a hydraulic driving assembly, a first locking nut and a second locking nut;

2. The bolt with tensioning function according to claim 1, wherein the hydraulic drive assembly comprises a housing fitted over the rod member, a piston disposed in the housing and engaged with the rod member and capable of being hydraulically driven to move axially along the rod member;

3. The self-tensioning bolt according to claim 2, wherein the rod member is provided with an annular projection on the second end, and the thread on the second end is provided on the annular projection;

4. The self-tensioning bolt according to claim 2, wherein the hydraulic drive assembly further comprises sealing rings respectively disposed at the fitting of the housing and the rod, between the outer periphery of the piston and the inner wall of the housing, and between the inner periphery of the piston and the outer periphery of the rod.

5. The bolt with tensioning function according to claim 2, wherein the housing is provided with at least one hydraulic oil passage port communicating with an inner space thereof.

6. The self-tensioning bolt according to claim 3, wherein the housing comprises a barrel, an end plate fitted at one end of the barrel, the opposite end of the barrel forming an open end; the end plate is provided with a through hole which is matched with the rod body and is communicated with the inner space of the cylinder body;

7. The self-tensioning bolt according to claim 6, wherein the hydraulic drive assembly further comprises a retainer ring; the baffle ring is arranged between the periphery of the annular bulge and the opening end of the cylinder body.

8. The bolt with tensioning function according to claim 1, wherein the first end of the rod member is formed with a guide section extending axially outwards; the guide section has an outer diameter less than an outer diameter of the first end.

9. A marine pipe flange connection structure comprising two flanges which are respectively provided on the end portions of a marine pipe and are fitted to each other, at least one bolt according to any one of claims 1 to 8;

10. A sea pipe flange connection according to claim 9, wherein said sea pipe flange connection comprises a plurality of said bolts; and a plurality of bolts are distributed at intervals along the circumferential direction of the flanges and locked on the two flanges.