CN115468054A - Connecting method for steel belt reinforced polyethylene spiral corrugated pipe joint - Google Patents

Abstract

The invention provides a method for connecting a steel belt reinforced polyethylene spiral corrugated pipe joint, which is characterized in that a first steel belt structure and an outer polyethylene structure of a part of wave crest areas close to a pipeline interface are removed by adjusting a spiral port structure of a pipeline, inner polyethylene at the wave crest positions is exposed outside, and a connecting section of the outer polyethylene structure of the wave crest is welded again after the inner polyethylene is welded, so that the steel belt is ensured to be separated from the external environment, and the risk of corrosion of the steel belt at the pipeline joint position is remarkably reduced.

Description

Connecting method for steel belt reinforced polyethylene spiral corrugated pipe joint

Technical Field

The invention relates to a connecting method of a steel strip reinforced polyethylene spiral corrugated pipe joint.

Background

The steel band reinforced Polyethylene (PE) spiral corrugated pipe is a metal skeleton plastic pipe. The pipe is introduced to China from the beginning of the 21 st century and becomes a common pipe for municipal drainage pipelines. Compared with a plastic spiral corrugated pipe, the plastic spiral corrugated pipe has the advantages of more excellent mechanical property, lighter weight, better economy and mature production process.

However, the mechanical properties of the pipe mainly depend on the structure of the steel belt, and if the polyethylene on the outer layer wrapping the steel belt is damaged or leaked, water enters the periphery of the steel belt along a leakage point, so that the steel belt is gradually rusted. The mechanical properties of the pipeline such as ring stiffness and the like are gradually reduced in the normal use process, so that the pipeline is easy to deform or damage, and sewage is blocked or leaked. The existing pipeline connection mode of the spiral pipeline port has defects, so that sewage can enter a cavity at the wave crest position and enter a steel belt from a seam at the bottom of outer polyethylene, and the steel belt is corroded.

Disclosure of Invention

The invention aims to provide a method for connecting a steel strip reinforced polyethylene spiral corrugated pipe joint.

In order to solve the above problems, the present invention provides a method for connecting a steel-band reinforced polyethylene spiral corrugated pipe joint, comprising:

respectively generating spiral interfaces at joints of two sections of pipelines to be connected;

removing the first steel belt structure in the wave crest area and the outer polyethylene structure coating the first steel belt structure, and only keeping the inner polyethylene structure in the wave crest area;

welding the wave trough areas of the two spiral joints;

welding inner layer polyethylene structures of wave crest areas of the two spiral interfaces to form an inner layer connecting section;

welding outer polyethylene structure linkage segment cladding on inner layer linkage segment, wherein, outer polyethylene structure linkage segment includes: the second steel belt structure and the outer polyethylene structure coating the second steel belt structure.

Further, in the above method, each of the plurality of spiral shaped interfaces includes a peak region and a valley region integrally connected, the peak region being connected to a tail of the valley region.

Further, in the above method, welding the valley regions of the two helical interfaces includes:

and (4) performing electric hot melting band welding on the wave trough areas of the two spiral interfaces.

Further, in the above method, welding the inner polyethylene structure of the wave region of the two spiral interfaces includes:

and carrying out hot-melt extrusion welding on the inner polyethylene structures of the wave crest areas of the two spiral interfaces.

Further, in the above method, the welding of the outer polyethylene structural connecting section to the inner connecting section includes:

and the outer polyethylene structure connecting section is coated and welded on the inner layer connecting section in a hot melting extrusion welding mode.

Further, in the above method, the welding of the outer layer polyethylene structure connecting section on the inner layer connecting section by hot-melt extrusion welding includes:

and the outer polyethylene structure connecting section is coated and welded on the inner layer connecting section in a hot melting extrusion welding mode along the periphery of the outer polyethylene structure connecting section.

Further, in the above method, the length of the peak region of each of the plurality of helical shaped interfaces is the same as the length of the valley region.

Compared with the prior art, the method has the advantages that the first steel belt structure and the outer polyethylene structure of the first steel belt structure in a part of wave crest area close to the pipeline interface are removed through adjusting the spiral port structure of the pipeline, the inner polyethylene at the wave crest position is exposed outside, the connecting section of the outer polyethylene structure of the wave crest is installed for secondary welding after the inner polyethylene is welded, the steel belt is ensured to be separated from the external environment, and the risk of corrosion of the steel belt at the position of the pipeline joint is obviously reduced.

By applying the invention, the risk of corrosion of the steel belt at the joint position of the steel belt reinforced Polyethylene (PE) spiral corrugated pipe can be obviously reduced, the stable mechanical property of the joint position of the pipeline during normal use is ensured, the occurrence rate of pipeline diseases is reduced, the occurrence rate of the diseases of the joint position and the conventional pipe section is not obviously different through the statistical data of pipeline disease investigation, and the investment of the maintenance cost of the municipal drainage pipeline is reduced.

The invention connects pipelines, seals the seams around the steel band in the wave crest area of the joint position, and comprises the following steps: the outer polyethylene layer and the inner polyethylene layer are both sealed by hot-melt extrusion welding, so that the steel belt is ensured to be separated from the external environment, and the risk of corrosion of the steel belt at the position of the pipeline joint is remarkably reduced

Drawings

FIG. 1 is a schematic view of a serpentine interface of one embodiment of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is an enlarged schematic view of point B of FIG. 2;

FIG. 4 is an enlarged schematic view of point C of FIG. 2;

FIG. 5 is a top view of an outer polyethylene structural connector segment according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view taken along D-D of FIG. 5;

FIG. 7 is a schematic illustration of an electrothermal ribbon weld in a valley region of an embodiment of the present invention;

FIG. 8 is a schematic view of a hot melt extrusion welding of an inner polyethylene structure in the peak area of an embodiment of the present invention;

FIG. 9 is a schematic view of a hot melt extrusion welding of an outer polyethylene structural joint section according to an embodiment of the present invention;

FIG. 10 is a schematic view of the completion of the pipe connection according to one embodiment of the present invention;

fig. 11 is an enlarged schematic view of point E of fig. 10.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1 to 11, the present invention provides a method for connecting a steel strip reinforced polyethylene spiral bellows joint, comprising:

step S1, respectively generating spiral interfaces at joints of two sections of pipelines to be connected, wherein each spiral interface comprises a peak area 1 and a trough area 2 which are connected into a whole as shown in figures 1 to 3, and the peak area 1 is connected to the tail part of the trough area 2;

s2, removing the first steel belt structure 5 in the wave crest region and the outer polyethylene structure 3 coating the first steel belt structure, and only retaining the inner polyethylene structure 4 in the wave crest region;

s3, welding the wave trough areas 2 of the two spiral interfaces;

s4, welding the inner-layer polyethylene structures 4 in the wave crest areas of the two spiral connectors to form inner-layer connecting sections;

step S5, as shown in fig. 5 to 6, welding the outer polyethylene structure connecting section 6 on the inner layer connecting section in a cladding manner, wherein the outer polyethylene structure connecting section 6 includes: the second steel belt structure and the outer polyethylene structure coating the second steel belt structure.

The first steel belt structure and the outer polyethylene structure of the first steel belt structure in a part of wave crest area close to the pipeline interface are removed through adjusting the spiral port structure of the pipeline, the inner polyethylene structure at the wave crest position is exposed outside, and the connecting section of the outer polyethylene structure of the wave crest is installed for welding again after the inner polyethylene structure is welded, so that the steel belt is ensured to be separated from the external environment, and the risk of corrosion of the steel belt at the position of the pipeline joint is obviously reduced.

By applying the invention, the risk of corrosion of the steel belt at the joint position of the steel belt reinforced Polyethylene (PE) spiral corrugated pipe can be obviously reduced, the stable mechanical property of the joint position of the pipeline during normal use is ensured, the occurrence rate of pipeline diseases is reduced, the occurrence rate of the diseases of the joint position and the conventional pipe section is not obviously different through the statistical data of pipeline disease investigation, and the investment of the maintenance cost of the municipal drainage pipeline is reduced.

In an embodiment of the method for connecting a steel strip reinforced polyethylene spiral corrugated pipe joint, step S3 is to weld trough regions of two spiral joints, and includes:

as shown in fig. 7, the valley areas of the two spiral joints are welded by an electrothermal welding band 9.

In an embodiment of the method for connecting a steel strip reinforced polyethylene spiral corrugated pipe joint, step S4 is to weld inner polyethylene structures in wave crest regions of two spiral joints, and the method includes:

as shown in fig. 8, the inner polyethylene structure of the two spiral-shaped interface peak areas is subjected to hot-melt extrusion welding 7.

In an embodiment of the method for connecting a steel strip reinforced polyethylene spiral corrugated pipe joint, step S5, the step of cladding and welding the outer polyethylene structure connecting section on the inner layer connecting section includes:

as shown in fig. 9, the outer polyethylene structural connecting segment 6 is clad-welded on the inner connecting segment by means of hot-melt extrusion welding 8.

Here, the present invention connects pipelines, and joints around steel belts in a crest region at a joint position are all closed, including: the outer polyethylene layer and the inner polyethylene layer are both sealed through hot melting extrusion welding, the steel belt is guaranteed to be separated from the external environment, and the risk of corrosion of the steel belt at the position of the pipeline joint is remarkably reduced.

In one embodiment of the method for connecting a steel strip reinforced polyethylene spiral corrugated pipe joint, the outer polyethylene structure connecting section is coated and welded on the inner connecting section in a hot-melt extrusion welding mode, and the method comprises the following steps:

and the outer polyethylene structure connecting section is coated and welded on the inner layer connecting section in a hot melting extrusion welding mode along the periphery of the outer polyethylene structure connecting section.

In one embodiment of the connection method of the steel strip reinforced polyethylene spiral corrugated pipe joint, the length of the crest region of each spiral joint is the same as that of the trough region.

In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (7)

1. A method for connecting a steel-band reinforced polyethylene spiral corrugated pipe joint is characterized by comprising the following steps:

respectively generating spiral interfaces at joints of two sections of steel belt reinforced polyethylene spiral corrugated pipelines to be connected;

removing the first steel belt structure in the wave crest region and the outer polyethylene structure coating the first steel belt structure, and only keeping the inner polyethylene structure in the wave crest region;

welding the wave trough areas of the two spiral interfaces;

welding inner layer polyethylene structures of wave crest areas of the two spiral interfaces to form an inner layer connecting section;

welding outer polyethylene structure linkage segment cladding on inner layer linkage segment, wherein, outer polyethylene structure linkage segment includes: the second steel belt structure and the outer polyethylene structure coating the second steel belt structure.

2. The method of connecting a steel strip reinforced polyethylene spiral corrugated pipe joint as recited in claim 1, wherein each spiral joint comprises a peak region and a valley region integrally connected, the peak region being connected to the end of the valley region.

3. The method of connecting a steel strip reinforced polyethylene spiral corrugated pipe joint as recited in claim 1, wherein welding valley regions of two spiral joints comprises:

and (4) performing electric hot melting band welding on the wave trough areas of the two spiral interfaces.

4. The method of joining a steel strip reinforced polyethylene spiral corrugated pipe joint as recited in claim 1, wherein welding the inner polyethylene structure of the crest region of the two spiral joints comprises:

and carrying out hot-melt extrusion welding on the inner polyethylene structures of the wave crest areas of the two spiral interfaces.

5. The method of joining a steel strip reinforced polyethylene spiral corrugated pipe joint as recited in claim 1, wherein the over-welding of the outer polyethylene structural joint section to the inner joint section comprises:

and coating and welding the outer polyethylene structure connecting section on the inner layer connecting section in a hot-melting extrusion welding mode.

6. The method for connecting the steel strip reinforced polyethylene spiral corrugated pipe joint according to claim 1, wherein the outer polyethylene structure connecting section is clad-welded to the inner connecting section by hot-melt extrusion welding, comprising:

and the outer polyethylene structure connecting section is coated and welded on the inner layer connecting section in a hot melting extrusion welding mode along the periphery of the outer polyethylene structure connecting section.

7. The method of connecting a steel strip reinforced polyethylene spiral corrugated pipe joint as recited in claim 1, wherein the length of the peak region of each spiral joint is the same as the length of the valley region.

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