CN223306569U

CN223306569U - A thermal insulation interface structure for directional drilling construction of thermal pipelines

Info

Publication number: CN223306569U
Application number: CN202422659412.8U
Authority: CN
Inventors: 戴亭; 王立丰; 迟宝; 赵桂章
Original assignee: Shen Kan Qinhuangdao General Engineering Design and Research Institute Corp of MCC
Current assignee: Shen Kan Qinhuangdao General Engineering Design and Research Institute Corp of MCC
Priority date: 2024-11-01
Filing date: 2024-11-01
Publication date: 2025-09-05
Anticipated expiration: 2034-11-01

Abstract

The utility model relates to the technical field of multi-layer composite sealing of pipelines, in particular to a heat-insulating interface structure for directional drilling construction of a heating pipeline, which comprises two sections of welded steel pipes, wherein the steel pipes comprise welding sections and non-welding sections positioned at two sides of the welding sections, the non-welding sections are sequentially provided with a polyurethane heat-insulating layer, a polyethylene protective layer and an electric hot melting sleeve outwards along the pipe diameter direction of the steel pipes, the pipe diameter direction of the welding sections is provided with the polyurethane heat-insulating layer and the electric hot melting sleeve outwards, and the edge positions at two ends of the electric hot melting sleeve are covered with a layer of heat-shrinkable sleeve. Compared with the prior art, when the technical scheme of the multilayer composite sealing measure is applied to the directional drilling construction process with the longitudinal tension of the directly buried pipeline being extremely high, the high tension malignant condition of the outer protection pipe on the heat preservation interface of the steel pipe can be effectively born, so that the effectiveness of a pipeline heat preservation system is ensured, and the safety and the reliability of the pipeline system are integrally improved.

Description

Heat preservation interface structure for directional drilling construction of heating power pipeline

Technical Field

The utility model relates to the technical field of multi-layer composite sealing of pipelines, in particular to a heat preservation interface structure for directional drilling construction of a heating pipeline.

Background

The conventional sleeve type heat preservation interface joint repairing technical scheme is adopted in the construction process of directly burying and directionally drilling the existing direct buried hot water pipeline, and the technical scheme is that the heat preservation joint is subjected to an airtight test after the pipeline is welded, and then is subjected to on-site foaming after being qualified, and sealing is carried out after foaming is finished.

At present, common technical measures are applied to the directional drilling construction process, and risk of sealing failure of a heat preservation interface is faced, because the tensile force received by a pipeline and an outer protective layer in the directional drilling construction is extremely high, the heat preservation interface is pulled open easily in the construction process, serious consequences of water inflow heat preservation failure are finally caused, heat loss is increased, and the service life of a steel pipe working pipe is shortened due to corrosion.

In view of this, the present utility model has been made.

Disclosure of utility model

The utility model aims to provide a heat preservation interface structure for directional drilling construction of a heating pipeline, which aims to solve the technical problems of the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

The heat preservation interface structure for the directional drilling construction of the heating power pipeline is characterized by comprising two sections of welded steel pipes, wherein the steel pipes comprise welding sections and non-welding sections positioned at two sides of the welding sections;

a polyurethane heat-insulating layer, a polyethylene protective layer and an electric melting sleeve are sequentially arranged on the non-welding section outwards along the pipe diameter direction of the steel pipe;

A polyurethane heat-insulating layer and an electric melting sleeve are arranged outwards in the pipe diameter direction of the welding section;

And a layer of heat shrinkage sleeve is covered at the edge positions of the two ends of the electric heating melting sleeve.

Preferably, a layer of heat-shrinkable tape is further covered on the heat-shrinkable sleeve.

Preferably, the outermost layer of the polyurethane heat-insulating layer on the welding section is flush with the outermost layer of the polyethylene protective layer on the non-welding section.

Preferably, a chamfer is arranged at the position where the heat shrinkage sleeve covers the electric melting sleeve, and hot melting glue is filled at the chamfer.

Preferably, the heat shrink sleeve covers the electric hot melt sleeve and extends at least 100mm to both sides along the end points of the electric hot melt sleeve.

Preferably, the shrink tape covers the heat shrink sleeve and extends at least 100mm to both sides toward both end points of the heat shrink sleeve, respectively.

Compared with the prior art, the heat preservation interface structure for directional drilling construction of the thermal pipeline has the advantages that when the technical scheme of the multilayer composite sealing measure is applied to the directional drilling construction process with extremely high longitudinal tension of a directly buried pipeline, the high-tension malignant condition of an outer protection pipe on a steel pipe heat preservation interface can be effectively born, so that the effectiveness of a pipeline heat preservation system is ensured, and the safety and the reliability of the pipeline system are integrally improved.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a thermal insulation interface structure for directional drilling construction of a thermal pipeline.

The figure is schematically shown as follows:

1. Steel pipe, polyurethane heat-insulating layer, polyethylene protective layer, electric hot melting sleeve, heat shrinkage belt, chamfer, welding section and non-welding section.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

As shown in FIG. 1, the embodiment of the utility model provides a heat preservation interface structure for directional drilling construction of a heating power pipeline, which comprises two sections of welded steel pipes 1, wherein each steel pipe 1 comprises a welding section 8 and non-welding sections 9 positioned at two sides of the welding section 8, a polyurethane heat preservation layer 2, a polyethylene protection layer 3 and an electric melting sleeve 4 are sequentially arranged on the non-welding sections 9 outwards along the pipe diameter direction of the steel pipe 1, the polyurethane heat preservation layer 2 and the electric melting sleeve 4 are arranged on the welding section 8 outwards along the pipe diameter direction, and a layer of heat shrinkage sleeve 5 is covered at the edge positions of two ends of the electric melting sleeve 4. A layer of heat-shrinkable tape 6 is covered on the heat-shrinkable sleeve 5. The outermost layer of the polyurethane heat insulation layer 2 on the welding section 8 is flush with the outermost layer of the polyethylene protection layer 3 of the non-welding section 9. The heat shrinkage sleeve 5 is covered on the electric hot melting sleeve 4, a chamfer 7 is arranged on the heat shrinkage sleeve, and hot melt adhesive is filled in the chamfer 7. The heat shrink sleeve 5 covers the electric hot melt sleeve 4 and extends at least 100mm to both sides along the end points of the electric hot melt sleeve 4. The shrink tape covers the heat shrink sleeve 5 and extends at least 100mm to both sides toward both end points of the heat shrink sleeve 5, respectively.

The embodiment of the utility model provides a heat preservation interface structure for directional drilling construction of a heating pipeline, which comprises the following specific implementation method:

The structure of the utility model can be carried out after the pipeline is welded and the strength test is qualified before the structure is implemented. Rust removal, oil stain and impurities removal are carried out on the surface of the welding section 8, the end surfaces of the insulating layers of the non-welding sections 9 on the two sides and the surface of the polyethylene outer protective layer of the lap joint section in the joint steel pipe 1 so as to ensure the adhesive force of polyurethane foaming in the later stage and the full adhesion of the hot melting sleeve, the hot shrinkage belt 6 and the polyurethane outer protective pipe.

And (3) sleeving an electric heating melting sleeve 4 outside the polyethylene outer protective layer, welding the electric heating melting sleeve, performing an air tightness test after welding, checking the pressure to be 20kPa, coating the joint with soapy water for 5-10 minutes, and checking that no air leakage phenomenon is qualified. And (3) performing on-site foaming by using a movable foaming machine after the foaming is qualified, wherein the proper temperature of the foaming site is 20-25 ℃, and when the ambient temperature is lower than the temperature range, local heating measures are performed to ensure the quality of the interface, and after the foaming is finished, welding the small holes.

Chamfering 7 is carried out on the edge of the welded electrothermal bushing 4, a gentle slope chamfer 7 is trimmed, and meanwhile, electrothermal fusion welding (commonly called handle welding) is used for filling hot melt adhesive on the trimmed chamfer 7 edge, so that the smoothness of the joint of the edge of the electrothermal bushing 4 and the polyethylene outer protective tube is ensured, and the filling material hot melt adhesive has the advantages of higher bonding strength, good high and low temperature environment resistance, excellent sealing performance, high shear strength, peel strength of more than or equal to 70N/cm and the like.

And a heat shrinkage sleeve 5 is stuck to the longitudinal welding seam of the edge of the chamfer 7 of the processed electric hot melting sleeve 4, the heat shrinkage sleeve 5 is thinner, and the effect of sealing the interface edge of the electric hot melting sleeve 4 is achieved after the heat treatment. The suitable temperature of the heating operation site is 20-25 ℃, and when the ambient temperature is lower than the temperature range, local heating measures are needed to ensure the interface quality.

After the heat shrinkage sleeve 5 is heated and bonded, a heat shrinkage belt 6 is arranged outside, the width of the heat shrinkage belt 6 is 10cm larger than that of the transverse welding seams at the two ends of the heat shrinkage sleeve 5, and the heat shrinkage belt 6 is rapidly heated so as to achieve the effect of sealing the transverse welding seams at the edges of the heat shrinkage sleeve 5 and the heat shrinkage sleeve. The peeling strength of the heat shrinkage belt 6 should be more than or equal to 80N/cm, the proper temperature of a heating operation site is 20-25 ℃, and when the ambient temperature is lower than the temperature range, local heating measures should be carried out to ensure the interface quality.

When the technical scheme of the multilayer composite sealing measure provided by the utility model is applied to a directional drilling construction process with extremely large longitudinal tension of a directly buried pipeline, the high tension malignant condition of an outer protection pipe on a heat insulation joint can be effectively born, so that the effectiveness of a pipeline heat insulation system is ensured, and the safety and reliability of the pipeline system are integrally improved.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or in communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model. It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

Claims

1. The heat preservation interface structure for the directional drilling construction of the heating power pipeline is characterized by comprising two sections of welded steel pipes, wherein the steel pipes comprise welding sections and non-welding sections positioned at two sides of the welding sections;

2. A thermal insulation interface structure for directional drilling construction of thermal pipelines according to claim 1, wherein a layer of thermal contraction tape is covered on the thermal contraction sleeve.

3. The thermal insulation interface structure for directional drilling construction of thermal pipelines according to claim 2, wherein the outermost layer of the polyurethane thermal insulation layer on the welding section is flush with the outermost layer of the polyethylene protective layer on the non-welding section.

4. A thermal insulation interface structure for directional drilling construction of thermal pipelines according to claim 3, wherein a chamfer is arranged at the position where the thermal shrinkage sleeve covers the electric hot melting sleeve, and hot melt adhesive is filled at the chamfer.

5. A thermal interface structure for use in heat pipe directional drilling operations as recited in claim 4, wherein said heat shrink sleeve covers said electric hot melt sleeve and extends at least 100mm to both sides along the end points of said electric hot melt sleeve.

6. A thermal interface structure for use in heat pipe directional drilling operations as recited in claim 5, wherein said shrink tape covers said heat shrink sleeve and extends at least 100mm to both sides toward each end of said heat shrink sleeve.