CN217422447U

CN217422447U - Welding type steel skeleton structure polyolefin composite pipe for underground water supply and drainage of coal mine

Info

Publication number: CN217422447U
Application number: CN202220206967.5U
Authority: CN
Inventors: 廖延君
Original assignee: Langfang Derun Technology Co ltd
Current assignee: Langfang Derun Technology Co ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-09-13
Anticipated expiration: 2032-01-25

Abstract

A welded steel skeleton structure polyolefin composite pipe for underground water supply and drainage of a coal mine belongs to the technical field of underground pipes of the coal mine. The flame-retardant antistatic polyolefin composite pipe is of a coaxial multilayer composite structure, the innermost layer is a flame-retardant antistatic polyolefin inner core pipe (1), a first bonding resin layer (2) is co-extruded on the outer layer of the flame-retardant antistatic polyolefin inner core pipe, the outer layer of the first bonding resin layer (2) is a welded steel skeleton structure (3), and the flame-retardant antistatic polyolefin inner core pipe (1) and the welded steel skeleton structure (3) are bonded into a whole by the first bonding resin layer (2); the outer layer of the welding type steel framework structure (3) is a second bonding resin layer (4), the outer layer of the second bonding resin layer (4) is a flame-retardant antistatic polyolefin outer pipe (5), and the welding type steel framework structure (3) and the flame-retardant antistatic polyolefin outer pipe (5) are bonded into a whole through the second bonding resin layer (4). Has good span bending strength, does not deform and is not easy to collapse, and can meet the requirement of service performance.

Description

Welding type steel skeleton structure polyolefin composite pipe for underground water supply and drainage of coal mine

Technical Field

The application belongs to the technical field of pipes for underground coal mines, and particularly relates to a welded type polyolefin composite pipe with a steel skeleton structure for underground water supply and drainage of a coal mine.

Background

China has been the first coal producing country and the first consuming country in the world for many years, the production and consumption amount accounts for about half of the world at present, and the coal is mainly used for the heavy industry of electric power, metallurgy, building materials and the like. Coal is used as important basic energy and industrial raw materials in China, the economic and social development is effectively supported, the yield of coal in China is 38.7 hundred million tons in 2014, and the coal provides inexhaustible power for continuous and rapid forward of economic trains in China. Coal mine pipeline transportation is very important, and is different from other transportation modes such as a vehicle and a ship, coal mine pipelines can continuously operate, and the transportation capacity is large.

For pipes for coal mines, people continue to use two modes, namely metal pipes and non-metal pipes, wherein the metal pipes are easily corroded by other chemical media. Corrosion is one of the major factors causing pipe breakage, and the maintenance and anti-corrosion painting of metal pipes is carried out annually at a high cost and is expensive. Data statistics of gas companies in England show that corrosion accounts for 40% of the accident causes of pipeline failure; in the statistics of failure accident causes of 30 years of operation of American oil and gas pipelines, the corrosion is 1483 and accounts for 63.4 percent. Pipelines with corrosion defects may cause collapse of mines, flood hazards and the like in the subsequent operation process.

Compared with metal pipes, the plastic pipeline has 1/3-1/2 of light weight only the metal pipe; corrosion resistance; the water flow resistance is small and is only 30-50% of that of the common steel pipe; the installation is simple and convenient quick: energy is saved; convenient transportation, low cost and the like. The popularity of plastic pipelines in several western countries is respectively: 100% in the United states, 92% in the United kingdom and 65% in Germany. However, the structural characteristics of the plastic pipe material itself have a serious disadvantage: 1. poor resistance, pressure resistance and impact resistance are not strong 2, the coefficient of linear expansion is large 3, and the surface is easy to scratch and cause fracture.

The steel wire mesh framework reinforced PE pipe appearing in recent years partially solves the problems. The pipeline is a net structure formed by winding and weaving PE serving as a basic raw material and steel wires serving as a framework material in a PE pipe from left to right on an inner layer pipe, so that the aim of reinforcement is fulfilled. A steel wire framework reinforced PE pipe is characterized in that a reinforced framework of the PE pipe and inner and outer layer plastics are bonded into a whole in a chemical compounding mode through hot melt adhesive. The inner wall and the outer wall of the pipe are smooth and do not scale. The composite pipe not only combines the advantages of the plastic pipe and the steel pipe, but also overcomes the defects of corrosion resistance, pressure resistance, corrosion resistance and the like of the plastic pipe. However, the steel wire mesh framework pipe has poor rigidity, especially low span bending strength, plastic deformation begins to occur after the pipe is used for a period of time, the appearance of the pipe becomes very difficult to see, and the waist collapse phenomenon is very serious. This brings great trouble to the management and appearance of the coal mine.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the application provides the welded type polyolefin composite pipe with the steel skeleton structure for underground water supply and drainage of the coal mine.

The application relates to a welded type steel skeleton structure polyolefin composite pipe for underground water supply and drainage of a coal mine, which is of a coaxial multilayer composite structure, wherein the innermost layer is a flame-retardant antistatic polyolefin inner core pipe (1), the outer layer of the flame-retardant antistatic polyolefin inner core pipe is provided with a first bonding resin layer (2), the outer layer of the first bonding resin layer (2) is a welded type steel skeleton structure (3), and the flame-retardant antistatic polyolefin inner core pipe (1) and the welded type steel skeleton structure (3) are bonded into a whole by the first bonding resin layer (2); the outer layer of the welding type steel framework structure (3) is a second bonding resin layer (4), the outer layer of the second bonding resin layer (4) is a flame-retardant antistatic polyolefin outer pipe (5), and the welding type steel framework structure (3) and the flame-retardant antistatic polyolefin outer pipe (5) are bonded into a whole through the second bonding resin layer (4).

The flame-retardant antistatic polyolefin inner core pipe (1) is formed by extruding flame-retardant antistatic polyolefin plastics, and the thickness is generally 4.0-15.0 mm.

The welded steel skeleton structure (3) is a steel pipe formed by welding steel materials along the circumferential direction or/and the axial direction, and the obtained steel pipe is provided with at least two welding seams; further, steel pipes formed by circumferentially winding and welding steel strips, steel pipes formed by axially butt-welding steel strips, or steel pipes formed by welding steel materials of other specifications; the thickness of the welding type steel framework structure is 1.0-8.0 mm.

The thickness of the flame-retardant antistatic polyolefin outer pipe (5) is 1.0-5.0 mm.

The flame-retardant antistatic polyolefin inner core pipe (1) and the flame-retardant antistatic polyolefin outer pipe (5) are made of the same or different materials; the first adhesive resin layer (2) and the second adhesive resin layer (4) are made of the same material or different materials.

The welded steel skeleton structure polyolefin composite pipe for underground water supply and drainage of the coal mine has high strength and reliable safety; the inner layer and the outer layer are made of flame-retardant antistatic polyolefin materials, and meet the requirement of safety in the morning under a coal mine; the steel skeleton structure polyolefin composite pipe has the main advantages that the steel skeleton structure polyolefin composite pipe has good span bending strength, does not deform and is not easy to collapse, and the performance is slightly lower than that of a steel pipe, but completely meets the requirement of service performance; more importantly, the product can determine the size and specification of the pipe, the thickness of the steel structure material and the like according to actual needs through the steel skeleton structure formed by welding such as winding or butt joint of steel strips, and is not limited by the specification and the size of the steel pipe; according to the steel-plastic composite pipe, the extrusion bonding resin and the double-resistance polyolefin plastic layer are coated on the outer layer, so that the corrosion of a steel pipe is avoided, and the outer protection and operation and maintenance cost of the pipe are effectively reduced; the welding type steel skeleton structure polyolefin composite pipe belongs to an environment-friendly product, has no VOC emission and no harmful substance precipitation, and has no influence on the natural environment and production technicians.

Drawings

FIG. 1 is a schematic view of a welded steel skeleton structure polyolefin composite pipe structure for underground water supply and drainage of a coal mine.

The innermost layer is fire-retardant antistatic polyolefin inner core pipe (1), first bonding resin layer (2), welded steel skeleton texture (3), second bonding resin layer (4), fire-retardant antistatic polyolefin outer tube (5), steel pipe welding seam (6).

Detailed Description

The present application is further illustrated by the following examples, but the present application is not limited to the following examples.

Example 1

Co-extruding a layer of adhesive steel material and a layer of hot melt adhesive of double-resistance polyolefin material on the outer layer of the flame-retardant antistatic polyolefin inner core tube 1 to form a whole together so as to convey a medium in a sealed way and prevent the corrosion of the middle steel material; the middle layer of the composite pipe is a welded steel skeleton structure which is formed by steel belt winding welding, steel belt butt welding or other specification steel materials welding; the outer layer of the welded steel skeleton structure is coated or extruded with a layer of hot melt adhesive with good compatibility of steel materials and the outer pipe double-resistance polyolefin plastic, so that the outer pipe double-resistance polyolefin plastic layer is bonded with the steel skeleton structure together, and the outer protective layer is formed by the outer layer and the coated or extruded flame-retardant antistatic polyolefin plastic, so that the safety requirement of the underground coal mine pipe and the requirement of protecting the welded steel skeleton structure from corrosion are met. Meanwhile, the color of the polyolefin plastic on the outer layer can be adjusted to meet the requirement of underground management of the coal mine.

Welding type steel skeleton structure polyolefin composite pipe material for underground water supply and drainage of coal mine and specification

1. The inner core pipe of the welding type steel skeleton structure polyolefin composite pipe for underground water supply and drainage of the coal mine is formed by extruding flame-retardant antistatic polyolefin plastics, wherein the polyolefin plastics include but are not limited to PE, PP, PVC and the like; the thickness of the inner core tube is generally 4.0-15.0 mm.

2. The first bonding resin layer is a hot melt adhesive layer coated or extruded outside the inner core tube, and has good bonding strength with the inner core tube and the steel material.

3. The welded steel skeleton structure is formed by steel belt winding welding, steel belt butt welding or other steel material welding, bears the pressure requirement of the pipe, provides super-strong span bending strength for the pipe, is not easy to deform and collapse in large-span installation, and keeps good appearance stability; the specification and thickness of steel belts, steel bars or steel wires and the like used by the welded steel framework structure are determined according to the pressure grade of the composite pipe and the size requirement of the pipe; the thickness of the welded steel skeleton structure is generally 1.0-8.0 mm.

4. The second adhesive resin layer is a layer of hot melt adhesive coated or extruded outside the steel skeleton structure, and has good adhesive strength with the outer double-resistance polyolefin material and the steel material.

5. The outer pipe of the welding type steel skeleton structure polyolefin composite pipe is formed by coating or extruding flame-retardant antistatic polyolefin plastics, namely a layer of double-resistance polyolefin plastics (which can be inconsistent with the material of the inner core pipe) is constructed outside the second bonding resin layer and forms an outer protective layer together with the bonding resin so as to protect the welding type steel skeleton structure from being corroded and damaged by the external environment; the thickness of the outer pipe of the steel skeleton structure polyolefin composite pipe is generally 1.0-5.0 mm.

6. The welding type steel skeleton structure polyolefin composite pipe for underground water supply and drainage of the coal mine can be directly connected by adopting hot melting and electric melting, and can also be connected by adopting an electric melting flange, a steel fastening flange and the like.

Claims

1. A welding type steel skeleton structure polyolefin composite pipe for underground water supply and drainage of a coal mine is characterized by being of a coaxial multilayer composite structure, wherein the innermost layer is a flame-retardant antistatic polyolefin inner core pipe (1), the outer layer of the flame-retardant antistatic polyolefin inner core pipe is provided with a first bonding resin layer (2), the outer layer of the first bonding resin layer (2) is a welding type steel skeleton structure (3), and the flame-retardant antistatic polyolefin inner core pipe (1) and the welding type steel skeleton structure (3) are bonded into a whole through the first bonding resin layer (2); the outer layer of the welding type steel framework structure (3) is a second bonding resin layer (4), the outer layer of the second bonding resin layer (4) is a flame-retardant antistatic polyolefin outer pipe (5), and the welding type steel framework structure (3) and the flame-retardant antistatic polyolefin outer pipe (5) are bonded into a whole through the second bonding resin layer (4);

the welding type steel framework structure (3) is a steel pipe formed by welding steel materials along the circumferential direction or/and the axial direction, and the obtained steel pipe is provided with at least two welding seams.

2. The welded type polyolefin composite pipe with the steel skeleton structure for underground water supply and drainage of the coal mine according to claim 1, wherein the flame-retardant antistatic polyolefin inner core pipe (1) is formed by extruding flame-retardant antistatic polyolefin plastic and has a thickness of 4.0-15.0 mm.

3. The welded steel skeleton structure polyolefin composite pipe for underground water supply and drainage of a coal mine according to claim 1, characterized in that the welded steel skeleton structure (3) is a steel pipe formed by welding steel belts in a circumferential winding manner and a steel pipe formed by butt welding the steel belts along an axial direction.

4. The welded steel skeleton structure polyolefin composite pipe for underground water supply and drainage of a coal mine according to claim 1, wherein the thickness of the welded steel skeleton structure is 1.0-8.0 mm.

5. The welded type steel skeleton structure polyolefin composite pipe for underground water supply and drainage of coal mine according to claim 1, characterized in that the thickness of the flame-retardant antistatic polyolefin outer pipe (5) is 1.0-5.0 mm.

6. The welded type steel skeleton structure polyolefin composite pipe for underground water supply and drainage of a coal mine according to claim 1, characterized in that the material of the flame-retardant antistatic polyolefin inner core pipe (1) is the same as or different from that of the flame-retardant antistatic polyolefin outer pipe (5); the first adhesive resin layer (2) and the second adhesive resin layer (4) are made of the same material or different materials.