A counterweight structure for a natural gas pipeline laid on the seabed

Abstract

The utility model relates to a counterweight structure for a natural gas pipeline laid on the seabed, comprising a pipeline body laid on the seabed, an anti-corrosion layer, a protective layer and a counterweight structure, wherein the pipeline body comprises a steel pipe, the steel pipe is wrapped with a reinforced 3PE anti-corrosion layer on the outside, the anti-corrosion layer is wrapped with a modified epoxy fiberglass protective layer on the outside, a counterweight layer is arranged outside the protective layer, and the counterweight structure 4 is a ring tube coated with a reinforced concrete counterweight layer C30. Compared with the prior art, the utility model has the advantages of being conducive to pre-installing the counterweight layer on the shore, speeding up the construction speed, greatly reducing the construction difficulty on the seabed, adding a modified epoxy fiberglass protective layer between the steel pipe anti-corrosion layer and the counterweight structure can protect the anti-corrosion layer of the steel pipe, greatly extending the service life of the steel pipe, and effectively reducing the occurrence of accidents.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe counterweights, in particular to a counterweight structure for a natural gas pipeline laid on the seabed. Background Art

[0002] In recent years, the number of natural gas pipelines crossing the seabed has gradually increased. To prevent the pipelines from floating, steel pipes are mostly made of the following counterweights: one is to use n-type concrete counterweights; the other is to use reinforced concrete encapsulated counterweights. Due to the seabed, these counterweight anti-floating methods are difficult to construct. For this reason, we propose a counterweight structure for natural gas pipelines laid on the seabed. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a counterweight structure for a natural gas pipeline laid on the seabed, which has a reasonable structure, greatly reduces the difficulty of construction, greatly prolongs the service life of the steel pipe, and effectively reduces the occurrence of accidents.

[0004] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is: a natural gas pipeline counterweight structure laid on the seabed, including a pipeline body laid on the seabed, an anti-corrosion layer, a protective layer and a counterweight structure, the pipeline body includes a steel pipe, the outside of the steel pipe is wrapped with a reinforced 3PE anti-corrosion layer, the outside of the anti-corrosion layer is wrapped with a modified epoxy fiberglass protective layer, and the outside of the protective layer is provided with a counterweight structure.

[0005] As an improvement: the counterweight structure is a ring tube covered with a reinforced concrete counterweight layer.

[0006] Compared with the prior art, the utility model has the following advantages: the annular pipe is coated with a reinforced concrete counterweight layer, which is conducive to the pre-installation of the counterweight structure on the shore, speeds up the construction speed, and greatly reduces the difficulty of construction on the seabed; a modified epoxy fiberglass protective layer is added between the steel pipe anti-corrosion layer and the counterweight structure to protect the anti-corrosion layer of the steel pipe, thereby greatly extending the service life of the steel pipe and effectively reducing the occurrence of accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a diagram of a counterweight structure for a natural gas pipeline laid on the seabed according to the utility model;

[0008] Reference table of reference numerals:

[0009] 1-steel pipe, 2-anti-corrosion layer, 3-protective layer, 4-counterweight layer. DETAILED DESCRIPTION

[0010] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.

[0011] like Figure 1As shown, a natural gas pipeline counterweight structure laid on the seabed includes a steel pipe 1 laid on the seabed, an anti-corrosion layer 2, a protective layer 3 and a counterweight structure 4, the steel pipe 1 is wrapped with a reinforced 3PE anti-corrosion layer 2 on the outside, the anti-corrosion layer 2 is wrapped with a modified epoxy fiberglass protective layer 3 on the outside, the protective layer is provided with a counterweight structure 4, and the counterweight structure 4 is a ring pipe coated with a reinforced concrete counterweight layer C30.

[0012] During the specific implementation of the utility model, the steel pipe 1 is firstly made of a reinforced 3PE anti-corrosion layer 2 in the factory, and then transported to the coast of the construction site to be welded and connected. After the weld joints are sandblasted and rusted, a heat shrink sleeve is used for anti-corrosion patching. A modified glass fiber reinforced plastic protective layer 3 is added to the outside of the anti-corrosion layer 2 to protect the anti-corrosion layer 2, and a counterweight layer 4 is covered on the outside of the protective layer 3 in an annular tube.

[0013] The counterweight layer is made of C30 reinforced concrete wrapped with annular tube.

[0014] Construction conditions: The reinforced 3PE anti-corrosion layer on the outside of the steel pipe should be inspected. Only after it passes the inspection can the modified fiberglass protective layer be constructed, and a counterweight layer should be wrapped around the outer ring pipe of the protective layer.

[0015] Construction requirements: Pre-treat the pipeline anti-corrosion layer and keep it clean; carry out construction within 4 hours after pre-treatment; the modified FRP protective layer evenly covers the outer surface of the pipeline anti-corrosion layer without wrinkles; the end overlap of the modified FRP protective layer is 8-9cm; after construction, cover the outer ring pipe of the protective layer with a C30 reinforced concrete material counterweight layer.

[0016] The above description is only a preferred embodiment of the present utility model patent and is not intended to limit the present utility model patent. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model patent shall be included in the protection scope of the present utility model patent.

Claims

1. A counterweight structure for a natural gas pipeline laid on the seabed, characterized in that: The invention comprises a steel pipe (1) laid on the seabed, an anti-corrosion layer (2), a protective layer (3) and a counterweight layer (4), wherein the steel pipe (1) is externally wrapped with a reinforced 3PE anti-corrosion layer (2), the anti-corrosion layer (2) is externally wrapped with a modified epoxy glass fiber reinforced plastic protective layer (3), the protective layer is externally wrapped with a counterweight layer (4), and the counterweight layer (4) is a ring pipe-coated C30 reinforced concrete counterweight material.

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