Heat preservation connector structure for directional drilling construction of heat distribution pipeline

Abstract

The utility model relates to the technical field of multi-layer composite sealing of pipelines, in particular to a heat preservation connector structure for directional drilling construction of a heat distribution pipeline, which comprises two welded steel pipes, and each steel pipe comprises a welding section and non-welding sections positioned on two sides of the welding section; the non-welding section is sequentially provided with a polyurethane heat preservation layer, a polyethylene protection layer and an electric hot melting sleeve outwards in the pipe diameter direction of the steel pipe. A polyurethane heat preservation layer and an electric hot melting sleeve are arranged outwards in the pipe diameter direction of the welding section. The edges of the two ends of the electric hot melting sleeve are covered with a layer of heat shrinkage sleeve. Compared with the prior art, when the multilayer composite sealing measure technical scheme is applied to a directional drilling construction process with great longitudinal tension of a directly-buried pipeline, the malignant condition of great tension of an outer protective pipe to a steel pipe thermal insulation interface can be effectively borne, so that the effectiveness of a pipeline thermal insulation system is ensured; and the safety and reliability of a pipeline system are integrally improved.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-layer composite sealing of pipelines, in particular to a thermal insulation interface structure used for directional drilling construction of thermal pipelines. Background Art

[0002] The existing direct buried hot water pipeline adopts the conventional "sleeve-type" insulation interface patching technology solution during the construction process of direct buried laying and directional drilling laying. This technical solution is to conduct an air tightness test on the insulation joint after the pipeline is welded. If it passes the test, it will be foamed on site and sealed after the foaming is completed.

[0003] At present, the commonly used technical measures face the risk of insulation interface sealing failure when applied to directional drilling construction technology. Because the pipeline and outer sheath are subjected to extremely large tensile forces during directional drilling construction, the insulation interface is very likely to be pulled apart prematurely during the construction process, resulting in serious consequences such as water ingress and insulation failure, which ultimately leads to increased heat loss and corrosion of the steel working pipe, shortening the service life.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a thermal insulation interface structure for directional drilling construction of thermal pipelines, so as to solve the technical problems raised by the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An insulation interface structure for directional drilling construction of a thermal pipeline, characterized by comprising two sections of welded steel pipes, wherein the steel pipes include a welded section and non-welded sections located on both sides of the welded section;

[0008] A polyurethane insulation layer, a polyethylene protective layer, and an electric heat-melting sleeve are sequentially arranged in the non-welded section along the diameter direction of the steel pipe.

[0009] A polyurethane insulation layer and an electric heat-melting sleeve are provided outwardly in the pipe diameter direction of the welding section;

[0010] The edge positions of both ends of the electric hot melt sleeve are covered with a layer of heat shrink sleeve.

[0011] Preferably, the heat shrink sleeve is covered with a layer of heat shrink tape.

[0012] Preferably, the outermost layer of the polyurethane insulation layer on the welding section is flush with the outermost layer of the polyethylene protective layer on the non-welding section.

[0013] Preferably, a chamfer is provided at the location where the heat shrink sleeve covers the electric hot melt sleeve, and hot melt adhesive is filled at the chamfer.

[0014] Preferably, the heat shrink sleeve covers the electric hot melt sleeve and extends at least 100 mm to both sides along the end points of the electric hot melt sleeve.

[0015] Preferably, the shrink band covers the heat shrink sleeve and extends at least 100 mm toward both ends of the heat shrink sleeve.

[0016] Compared with the existing technology, the utility model provides an insulation interface structure for directional drilling construction of thermal pipelines. When this multi-layer composite sealing measure technical solution is applied to the directional drilling construction process with extremely large longitudinal tension of the direct-buried pipeline, it can effectively withstand the harsh conditions of large tension at the insulation interface of the steel pipe caused by the outer protective pipe, thereby ensuring the effectiveness of the pipeline insulation system and improving the safety and reliability of the pipeline system as a whole.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 The utility model provides a structural schematic diagram of a thermal insulation interface structure for directional drilling construction of thermal pipelines.

[0020] The diagram is as follows:

[0021] 1. Steel pipe; 2. Polyurethane insulation layer; 3. Polyethylene protective layer; 4. Electric hot melt sleeve; 5. Heat shrink sleeve; 6. Heat shrink tape; 7. Chamfer; 8. Welding section; 9. Non-welding section. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0023] like Figure 1 As shown, an embodiment of the present invention provides an insulation interface structure for directional drilling of thermal pipelines. The structure comprises two welded steel pipes 1, each comprising a welded section 8 and non-welded sections 9 on either side of the welded section 8. A polyurethane insulation layer 2, a polyethylene protective layer 3, and an electric hot melt sleeve 4 are sequentially arranged along the diameter of the steel pipe 1 on the non-welded section 9. The polyurethane insulation layer 2 and the electric hot melt sleeve 4 are also arranged along the diameter of the welded section 8. A heat shrink sleeve 5 covers the edges of both ends of the electric hot melt sleeve 4. A heat shrink tape 6 is further applied to the heat shrink sleeve 5. The outermost layer of the polyurethane insulation layer 2 on the welded section 8 is flush with the outermost layer of the polyethylene protective layer 3 on the non-welded section 9. A chamfer 7 is formed where the heat shrink sleeve 5 covers the electric hot melt sleeve 4, and the chamfer 7 is filled with hot melt adhesive. The heat shrink sleeve 5 covers the electric hot melt sleeve 4 and extends at least 100 mm to either side of the end of the electric hot melt sleeve 4. The shrink band covers the heat shrink sleeve 5 and extends at least 100 mm toward both ends of the heat shrink sleeve 5 .

[0024] The embodiment of the utility model provides a thermal insulation interface structure for directional drilling construction of thermal pipelines. The specific implementation method is as follows:

[0025] Before implementing the structure of this utility model, the pipeline should be welded and passed the strength test. The surface of the welded section 8 in the interface steel pipe 1, the end surface of the insulation layer of the non-welded section 9 on both sides, and the surface of the polyethylene outer sheath of the overlapped section should be cleaned of rust, oil and impurities to ensure the adhesion of the polyurethane foam in the later stage and the sufficient adhesion of the hot melt sleeve and heat shrink tape 6 to the polyurethane outer sheath.

[0026] The polyethylene outer sheath is covered with an electric hot melt sleeve 4 and welded. After welding, an airtightness test is performed. The test pressure is 20kPa. Soapy water is applied to the joint for 5-10 minutes. If there is no leakage, it is qualified. After passing the test, a mobile foaming machine is used for on-site foaming. The suitable temperature for foaming is 20-25℃. When the ambient temperature is lower than this temperature range, local heating measures should be taken to ensure the quality of the interface. After foaming is completed, the small holes are welded shut.

[0027] The edge of the welded electric hot melt sleeve 4 is chamfered 7 to form a gently sloping chamfer 7. At the same time, hot melt adhesive is filled at the edge of the repaired chamfer 7 by electric hot melt welding (commonly known as handle welding) to ensure that the connection between the edge of the electric hot melt sleeve 4 and the polyethylene outer protective tube is smooth. The hot melt adhesive of the filling material has high bonding strength and good resistance to high and low temperature environments, excellent sealing, high shear strength, and peel strength ≥70N / cm.

[0028] A heat shrink sleeve 5 is applied to the longitudinal weld seam of the chamfered edge 7 of the heat-melting sleeve 4. The heat shrink sleeve 5 is relatively thin and, after heating, seals the edge of the interface of the heat-melting sleeve 4. The optimal temperature for the heating operation site is 20-25°C. When the ambient temperature is lower than this range, local heating measures should be performed to ensure the quality of the interface.

[0029] After the heat-shrink sleeve 5 is heated and bonded, a heat-shrink tape 6 is applied. The width of the tape 6 must be 10 cm wider than the transverse weld seams between the heat-melt sleeve and the heat-shrink sleeve 5. Rapid heating is performed to seal the transverse weld seams at the edges of the heat-melt sleeve and the heat-shrink sleeve 5. The peel strength of the tape 6 should be ≥80 N / cm. The optimal temperature for the heating operation is 20-25°C. If the ambient temperature is below this range, local heating should be applied to ensure the quality of the interface.

[0030] When the multi-layer composite sealing measure technical solution provided by the utility model is applied to the directional drilling construction process with extremely large longitudinal tension of the direct-buried pipeline, it can effectively withstand the harsh conditions of large tension of the outer protective pipe on the insulation interface, thereby ensuring the effectiveness of the pipeline insulation system and improving the overall safety and reliability of the pipeline system.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0033] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, and the like made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention. It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

Claims

1. A thermal insulation interface structure for directional drilling construction of thermal pipelines, characterized in that: A steel pipe comprising two sections of welded steel pipe, wherein the steel pipe comprises a welded section and non-welded sections on both sides of the welded section; A polyurethane insulation layer, a polyethylene protective layer, and an electric heat-melting sleeve are sequentially arranged in the non-welded section along the diameter direction of the steel pipe. A polyurethane insulation layer and an electric heat-melting sleeve are provided outwardly in the pipe diameter direction of the welding section; The edge positions of both ends of the electric hot melt sleeve are covered with a layer of heat shrink sleeve.

2. The thermal insulation interface structure for directional drilling construction of thermal pipelines according to claim 1, characterized in that: The heat shrink sleeve is covered with a layer of heat shrink tape.

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

4. The thermal insulation interface structure for directional drilling construction of thermal pipelines according to claim 3, characterized in that: A chamfer is provided at the location where the heat shrink sleeve covers the electric hot melt sleeve, and hot melt adhesive is filled at the chamfer.

5. The thermal insulation interface structure for directional drilling construction of thermal pipelines according to claim 4, characterized in that: The heat shrink sleeve covers the electric hot melt sleeve and extends at least 100 mm to both sides along the end points of the electric hot melt sleeve.

6. The thermal insulation interface structure for directional drilling construction of thermal pipelines according to claim 5, characterized in that: The shrink band covers the heat shrink sleeve and extends at least 100 mm toward both ends of the heat shrink sleeve.

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