Power pipeline anticorrosion sealing device and laying construction method

Abstract

The present application relates to the technical field of underwater laying and joint anticorrosion sealing construction of power pipeline, and particularly relates to a power pipeline anticorrosion sealing device and laying construction method, which comprises a power pipeline anticorrosion sealing device sleeved outside a pipe joint formed by butt joint of adjacent power pipeline pipe sections; sealing glue is injected into an annular sealing cavity through a glue injection port of the power pipeline anticorrosion sealing device, and medium in the annular sealing cavity is discharged through an exhaust port; the cavity pressure of the annular sealing cavity and the external hydrostatic pressure outside the power pipeline anticorrosion sealing device are collected, the pressure difference is calculated, and the cavity pressure is adjusted through a pressure compensation channel arranged on the power pipeline anticorrosion sealing device; the power pipeline is lowered to the seabed or a target position underwater along a predetermined laying path, and the tension and bending radius of the power pipeline are limited and controlled during the lowering process; the sealing integrity at the pipe joint is detected and the detection result is recorded. The present application solves the problem that the internal and external pressure difference is difficult to stabilize during the curing stage.

Claims

1. A method for constructing anti-corrosion pipelines, characterized in that, include: S1. An anti-corrosion sealing device for power pipelines is fitted on the outside of the pipe joint formed by the connection of adjacent power pipeline sections, so that the anti-corrosion sealing device for power pipelines forms an annular sealing cavity covering the pipe joint. S2. Sealant is injected into the annular sealing cavity through the injection port of the power pipeline anti-corrosion sealing device, and the medium in the annular sealing cavity is discharged through the exhaust port until the preset filling conditions are met, then the injection port and the exhaust port are closed to enter the curing stage. S3. During the curing stage, the pressure inside the annular sealed cavity is measured. External hydrostatic pressure on the outside of the power pipeline anti-corrosion sealing device Calculate the pressure difference The pressure inside the cavity is adjusted by a pressure compensation channel located on the anti-corrosion sealing device of the power pipeline. The pressure difference Maintain within the preset differential pressure range Continue until the preset curing time ends; S4. After curing, the power pipeline is lowered to the seabed or underwater target location along the predetermined laying path, and the tension and bending radius of the power pipeline are restricted and controlled during the lowering process. S5. After the lowering is completed, the sealing integrity of the pipe section joint is checked and the test results are recorded; in, The pressure inside the annular sealing cavity. The external hydrostatic pressure is... The pressure difference, This is the lower limit of the pressure difference. This is the upper limit of the pressure difference.

2. The method for constructing anti-corrosion pipelines according to claim 1, characterized in that, Before step S2, the glue injection pipeline and the venting pipeline are connected to the glue injection port and the venting port respectively through self-sealing detachable connection interfaces, so that the corresponding channels are in a closed state when the connection is disconnected after the glue injection and venting are completed; wherein, the self-sealing detachable connection interface is a connection interface provided at each channel port of the power pipeline anti-corrosion sealing device, used for detachable connection with external pipelines and self-sealing when the connection is disconnected.

3. The method for constructing anti-corrosion pipelines according to claim 2, characterized in that, During the curing stage, the compensation pipeline is connected to the compensation port of the pressure compensation channel through the self-sealing detachable connection interface, and the medium is injected or released into the pressure compensation channel through the compensation pipeline; wherein the medium is gas or liquid.

4. The method for constructing anti-corrosion pipelines according to claim 3, characterized in that, Before step S2, the extraction pipeline is connected to the extraction port of the extraction channel on the power pipeline anti-corrosion sealing device through the self-sealing detachable connection interface, and the extraction pipeline is used to perform extraction operation on the annular sealing cavity.

5. The method for constructing anti-corrosion pipelines according to claim 4, characterized in that, The extraction operation includes: extracting water from the annular sealed cavity through the extraction port, thereby reducing the pressure inside the cavity. Not greater than the preset sampling threshold Then the sealant is injected; wherein, The preset extraction threshold is defined as follows.

6. The method for constructing anti-corrosion pipelines according to claim 5, characterized in that, In step S2, before injecting the sealant, an anti-corrosion primer is first injected into the annular sealing cavity through the injection port to replace the interface corresponding to the annular sealing cavity, and the anti-corrosion primer and the sealant are different material systems.

7. The method for constructing anti-corrosion pipelines according to claim 6, characterized in that, The annular sealing cavity is divided into at least two circumferential partitioned sealing cavities, and the anti-corrosion primer and the sealant are injected into the at least two circumferential partitioned sealing cavities in a preset order, zone by zone.

8. The method for constructing anti-corrosion pipelines according to claim 1, characterized in that, The preset pressure difference range With curing time Increasing while contracting; among them, For curing time.

9. The method for constructing anti-corrosion pipeline laying according to claim 8, characterized in that, The intracavitary pressure is adjusted via the pressure compensation channel. Including: When Time-compensated injection medium to increase ,when Release medium to reduce The medium is either a gas or a liquid. The external hydrostatic pressure The pressure is collected by an external pressure tap located on the outside of the power pipeline anti-corrosion sealing device, and the external pressure tap is connected to an external pressure sensor.

10. A power pipeline anti-corrosion sealing device, used to implement the power pipeline anti-corrosion laying construction method according to any one of claims 1 to 9, characterized in that, include: The split sleeve includes a first sleeve half and a second sleeve half that can be detachably connected. The inner lining layer is disposed on the inner wall of the split sleeve and is attached to the outer wall of the power pipeline; An annular sealing cavity is formed between the inner liner and the split sleeve, and is provided with a corresponding pipe section joint. Glue injection channel, glue injection port, and venting channel and venting port; Pressure compensation channel and compensation valve disposed on the pressure compensation channel; A cavity pressure sensor and an external pressure sensor are used to collect the internal pressure of the annular sealed cavity. The external pressure sensor is used to collect the external hydrostatic pressure on the outside of the split sleeve. ; Circumferential positioning structure, axial limiting structure, and fastening components; The glue injection port and the vent are provided with a self-sealing and detachable connection interface.

Images