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Prefabricated thermal insulation double-layer bent pipe and its preparation method

A bending and double-layer technology, which is applied in the field of urban heating directly buried hot water pipeline engineering, can solve the problems of insufficient bending and deformation resistance of the bending pipe, and achieve the effects of long fatigue life, improved bearing capacity, and reduced maximum stress.

Active Publication Date: 2021-11-05
TANGSHAN XINGBANG PIPE CONSTR EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem that ordinary elbows cannot meet the connection of corner pipes under the action of thermal stress on long straight pipes on both sides in direct-buried heating pipeline projects, the present invention provides long fatigue life and better operation according to the insufficient ability of the existing elbows to resist bending deformation. A safe and reliable high-strength elbow product, a double-layer elbow product produced by the factory - prefabricated thermal insulation double-layer elbow

Method used

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  • Prefabricated thermal insulation double-layer bent pipe and its preparation method
  • Prefabricated thermal insulation double-layer bent pipe and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: The core pipe elbow 1 and the core pipe elbow straight pipe arm 2 constitute the core pipe; the casing pipe elbow 3 and the casing pipe elbow straight pipe arm 4 constitute the casing pipe.

[0027] figure 1 As shown, in this embodiment, there is 1 core tube elbow, 2 core tube elbow straight tube arms, 4 connecting plates, 1 casing elbow, 2 casing elbow straight tube arms, and 2 annular plugs .

[0028] The production process of this embodiment: first, the core pipe elbow 1 and the core pipe elbow straight pipe arm 2 are welded into a core pipe, and the angle β of the core pipe elbow is 90 degrees; secondly, the core pipe and the connecting plate 5 are connected under normal or preheating conditions Welding; then both sides of the core pipe wear annular plugs 6, and under normal or preheating conditions, the annular plugs 6 are welded to the core pipe 2, and the annular plugs 6 are welded to the connecting plate 5; next, the casing elbows 3 and Casing el...

Embodiment 2

[0030] Embodiment 2: In this embodiment, there is 1 core tube, 1 sleeve pipe, 4 connecting plates, and 2 annular plugs.

[0031] The production process of this embodiment: firstly, the integrated core tube 9 is made, and the angle β of the core tube elbow is 85 degrees; secondly, the welding of the four connecting plates 5 and the core tube 9 is completed under the normal or preheating state; then the core tube 9 is two The side piercing ring plug 6 is welded to the core tube 2 under normal or preheating conditions, and the ring plug 6 is welded to the connecting plate 5; next, the integrated casing 10 is made, and the casing 10 is installed. Under normal or preheating conditions, the casing 10 is welded to the annular plug 6 . Finally, an insulation layer 7 is added to the outer surface of the casing; a protective layer 8 is added to the outer surface of the insulation layer 7 .

Embodiment 3

[0032] Embodiment 3: The angle β of the elbow of the core tube of the present invention is 100 degrees, and other contents are the same as in Embodiment 1.

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Abstract

The prefabricated thermal insulation double-layer bend pipe and its preparation method belong to the technical field of urban heating directly buried hot water pipeline engineering. series of products. The prefabricated thermal insulation double-layer elbow includes a core pipe, a casing, a connecting plate, an annular plug, an insulating layer, and a protective layer. In the preheating state, the annular plug and the casing are welded, and a layer of insulation is provided outside the casing, and a protective layer is provided outside the insulation. The invention realizes non-compensated laying in the true sense of the directly buried heating pipe network, and solves the problem of insufficient strength of the ordinary compensating elbow when the ordinary elbow cannot meet the thermal stress of the long straight arm in the current direct buried heating pipeline project.

Description

technical field [0001] The invention belongs to the technical field of direct-buried hot water pipeline engineering for urban heating, and in particular relates to prefabricating a heat-insulating double-layer bent pipe in a factory. Background technique [0002] With the development of society, direct buried laying has been widely used in central heating pipelines. When the compensation straight arm of the compensation elbow of the direct-buried non-compensation heating pipeline is very long, the compensation elbow needs to bear a large bending stress, so that it exceeds the conditions for checking the stress of the compensation elbow. For this reason, in actual engineering, compensators and fixed piers are often added to protect the compensating elbow, so it is difficult to realize direct burial without compensating laying in the true sense without artificially setting compensators, which not only increases the cost, but also reduces the cost. Reliability of directly buri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L43/00F16L59/22
CPCF16L43/00F16L59/22
Inventor 王飞孙春艳王国伟雷勇刚曹珍
Owner TANGSHAN XINGBANG PIPE CONSTR EQUIP