A connection structure between an underground elbow and a vertical pipe section of a directly buried steam pipeline

Abstract

A connection structure between an elbow of a directly buried steam pipeline and a vertical pipe section, wherein the elbow is provided with an elbow working steel pipe, an elbow insulation layer and an elbow outer protective pipe in sequence from the inside to the outside, one end of the elbow is connected to the directly buried steam pipeline laid underground, and the other end is vertically extended from the ground and connected to the overhead steam pipeline through a vertical pipe section; the vertical pipe section is provided with a vertical pipe section working steel pipe, a vertical pipe section insulation layer and a vertical pipe section outer protective pipe in sequence from the inside to the outside; the special feature is that the elbow working steel pipe and the elbow outer protective pipe at the ground extension end of the elbow are eccentric assembly structures, and a rain cover is provided on the outer wall of the working steel pipe at the ground extension end of the elbow. The utility model realizes a reliable sealed connection between the directly buried steam pipeline and the vertical pipe section, and achieves the purpose of improving the construction quality of the direct buried steam pipeline and ensuring the stable operation of the urban heating pipe network system.

Description

Technical Field

[0001] The utility model relates to the technical field of steam delivery pipelines, in particular to a connection structure between an underground elbow of a directly buried steam pipeline and a vertical pipe section. Background Art

[0002] The direct buried steam pipe laying method has the advantages of high construction efficiency and low cost. The pipe fittings of the direct buried steam pipe can be prefabricated in the factory in advance, the later project maintenance and management are simple, the heat loss generated during operation is small, and it has a positive impact on urban environmental improvement and urban beautification. Therefore, steam pipes have been widely used in the construction of urban heating pipe network systems.

[0003] In the direct buried installation project of steam pipelines, the connection between the underground elbow and the vertical pipe section is one of the key elements of quality control during the construction process. Since prefabricated steam transmission pipe fittings usually adopt a three-layer structure of working steel pipe, insulation layer and outer protective pipe, and the insulation layer of the underground elbow and the directly buried pipeline is a soft insulation material mainly composed of glass wool, and the outer protective pipe is a steel casing, the vertical pipe section connected after the pipeline is out of the ground has the same structure as the steam pipeline laid overhead, and its insulation layer is generally composed of soft insulation material, hard insulation material and polyurethane foam material, and the outer protective pipe is made of galvanized iron sheet, steel plate or color steel plate. It can be seen that there are differences in the insulation layer structure and outer protective pipe material of the underground elbow and the vertical pipe section; in addition, the direct buried steam pipeline also has the problem of axial elongation of the working steel pipe caused by thermal effect during operation, which brings difficulties to the reliable sealing connection between the underground elbow and the vertical pipe section, so it is necessary to optimize the design of the connection structure between the underground elbow and the vertical pipe section of the direct buried steam pipeline. Utility Model Content

[0004] The utility model provides a connection structure of an underground elbow of a directly buried steam pipeline and a vertical pipe section, which aims to realize a reliable sealed connection between the directly buried steam pipeline and the vertical pipe section by means of measures such as setting a rainproof cover, eccentrically installing the working steel pipe of the underground elbow and staggeredly setting a support plate on the vertical pipe section, so as to improve the construction quality of the direct buried steam pipeline and ensure the stable operation of the urban heating pipe network system.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A connection structure between an underground elbow of a directly buried steam pipeline and a vertical pipe section, wherein the underground elbow is provided with an elbow working steel pipe, an elbow insulation layer and an elbow outer protective pipe in sequence from the inside to the outside, one end of the underground elbow is connected to the underground directly buried steam pipeline, and the other end is vertically extended from the ground and connected to the overhead steam pipeline through a vertical pipe section; the vertical pipe section is provided with a vertical pipe section working steel pipe, a vertical pipe section insulation layer and a vertical pipe section outer protective pipe in sequence from the inside to the outside; the special feature of the structure is that the elbow working steel pipe and the elbow outer protective pipe at the ground extending end of the underground elbow are eccentrically assembled structures, and a rain cover is provided on the outer wall of the working steel pipe at the ground extending end of the underground elbow.

[0007] The above-mentioned direct-buried steam pipe underground elbow and vertical pipe section connection structure, the rain cover is open downward, and is welded to the elbow working steel pipe at the ground protruding end of the underground elbow at the construction site. The rain cover completely covers the elbow insulation layer and the elbow outer protective pipe at the ground protruding end of the underground elbow, and the welding assembly height of the rain cover matches the specific conditions of the construction site.

[0008] In the above-mentioned structure for connecting the underground elbow of the directly buried steam pipeline with the vertical pipe section, the offset direction of the outer protective pipe of the elbow of the eccentric assembly structure of the underground elbow is consistent with the flow direction of the medium in the steam pipeline.

[0009] The above-mentioned direct-buried steam pipe underground elbow and vertical pipe section connection structure has a semicircular ring support plate set between the vertical pipe section working steel pipe and the vertical pipe section outer protective pipe. The semicircular ring support plates are arranged in several groups along the central axis direction of the vertical pipe section, and the adjacent two groups are staggered along the circumferential direction of the vertical pipe section working steel pipe.

[0010] The above-mentioned direct-buried steam pipe outlet elbow and vertical pipe section connection structure, the semicircular ring support plate is made of steel plate and is welded on the outer wall of the working steel pipe of the vertical pipe section.

[0011] The above-mentioned direct-buried steam pipe underground elbow and vertical pipe section connection structure has a drain pipe set at the connection end of the underground elbow and the underground buried steam pipe. One end of the drain pipe is connected to the bottom of the elbow working steel pipe, and the other end is connected to the external environment above the ground.

[0012] The above-mentioned direct-buried steam pipe underground elbow and vertical pipe section connection structure, the elbow insulation layer adopts soft insulation material, and the elbow outer protective pipe adopts steel casing; the vertical pipe section insulation layer is a composite structure of soft insulation material, hard insulation material and polyurethane foam material, and the vertical pipe section outer protective pipe is made of galvanized iron sheet or steel plate or color steel plate.

[0013] The utility model provides a connection structure between an elbow and a vertical pipe section of a directly buried steam pipeline. Since the working steel pipe of the elbow at the ground-extending end of the elbow and the outer protective pipe of the elbow adopt an eccentric assembly structure, during the operation of the steam pipeline, the axial elongation of the working steel pipe of the directly buried steam pipeline caused by the thermal effect can be compensated by compressing the soft insulation material in the insulation layer of the ground-extending end of the elbow. The utility model also arranges a rain cover on the outer wall of the working steel pipe at the ground-extending end of the elbow, and its beneficial effects are manifested in the following two aspects: first, during the pipeline laying construction, the rain cover can be used to prevent rainwater from entering the insulation layer of the elbow; second, the rain cover is welded to the outer protective pipe of the elbow and the outer protective pipe of the vertical pipe section respectively, so as to solve the problem of difficulty in direct assembly caused by the different end surface structures and materials of the two. The utility model sets a semicircular ring support plate between the vertical pipe section working steel pipe and the vertical pipe section outer protective pipe, which not only avoids the problem of poor insulation effect caused by the fall of the insulation layer material, but also effectively prevents the thermal bridge effect of heat propagation through the circumferential staggered arrangement between two adjacent groups of semicircular ring support plates. In summary, the utility model realizes a reliable sealed connection between the direct buried steam pipeline and the vertical pipe section by setting a rain cover, eccentrically installing the working steel pipe of the ground elbow, and setting a support plate staggered in the vertical pipe section, thereby achieving the purpose of improving the construction quality of the direct buried steam pipeline and ensuring the stable operation of the urban heating pipe network system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the connection structure between the ground elbow and the vertical pipe section of the directly buried steam pipeline of the utility model;

[0015] Figure 2 yes Figure 1 The enlarged view of the structure at position Ⅰ in the middle;

[0016] Figure 3 yes Figure 1 Schematic diagram of the AA section structure;

[0017] Figure 4 yes Figure 1 Schematic diagram of the BB cross-section structure.

[0018] Explanation of the symbols in the figure:

[0019] 1 is the ground elbow, 1-1 is the elbow working steel pipe, 1-2 is the elbow insulation layer, 1-3 is the elbow outer protective pipe; 2 is the vertical pipe section, 2-1 is the vertical pipe section working steel pipe, 2-2 is the vertical pipe section insulation layer, 2-3 is the vertical pipe section outer protective pipe; 3 is the rain cover; 4 is the drain pipe; 5 is the semicircular support plate. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] See Figure 1. Figure 2 , Figure 4 The utility model provides a connection structure between an underground elbow and a vertical pipe section of a directly buried steam pipeline. The underground elbow 1 is provided with an elbow working steel pipe 1-1, an elbow insulation layer 1-2 and an elbow outer protective pipe 1-3 in sequence from the inside to the outside. The elbow insulation layer 1-2 adopts a soft insulation material, and the elbow outer protective pipe 1-3 adopts a steel casing. One end of the underground elbow 1 is connected to the underground directly buried steam pipeline, and the other end extends vertically from the ground and is connected to the overhead steam pipeline through a vertical pipe section 2; the vertical pipe section 2 is provided with A vertical pipe section working steel pipe 2-1, a vertical pipe section insulation layer 2-2 and a vertical pipe section outer protective pipe 2-3, wherein the vertical pipe section insulation layer 2-2 is a composite structure of soft insulation material, hard insulation material and polyurethane foam material, and the vertical pipe section outer protective pipe 2-3 is made of galvanized iron sheet or steel plate or color steel plate; the special feature is that the elbow working steel pipe 1-1 and the elbow outer protective pipe 1-3 at the ground-extending end of the elbow 1 are eccentrically assembled structures, and a rain cover 3 is arranged on the outer wall of the elbow working steel pipe 1-1 at the ground-extending end of the elbow 1.

[0022] See also Figure 1 , Figure 2 , Figure 4 The utility model discloses a direct buried steam pipe outlet elbow and vertical pipe section connection structure, whose rain cover 3 is open downward, and its outer edge height is lower than the center height, which plays a role in guiding rainwater. The rain cover 3 is welded to the elbow working steel pipe 1-1 at the ground-extending end of the outlet elbow 1 at the construction site, and the elbow insulation layer 1-2 and the elbow outer protective pipe 1-3 at the ground-extending end of the outlet elbow 1 are completely covered by the rain cover 3. The welding assembly height of the rain cover 3 is determined according to the specific conditions of the construction site; the offset direction of the elbow outer protective pipe 1-3 of the eccentric assembly structure of the outlet elbow 1 of the utility model is consistent with the flow direction of the medium in the steam pipe, as shown in the attached figure. Figure 1 and attached Figure 4 As shown, when the medium in the steam pipe flows from right to left, the central axis of the elbow outer protective pipe 1-3 at the ground extending end of the ground elbow 1 shifts to the left, that is, the central axis of the elbow working steel pipe 1-1 is located on the left side of the central axis of the elbow outer protective pipe 1-3.

[0023] See also Figure 1 , Figure 3 The utility model discloses a direct buried steam pipe outlet elbow and vertical pipe section connection structure, wherein a semicircular ring support plate 5 is arranged between the vertical pipe section working steel pipe 2-1 and the vertical pipe section outer protective pipe 2-3, wherein the semicircular ring support plates 5 are arranged in a plurality of groups along the central axis direction of the vertical pipe section 2, and adjacent groups are arranged circumferentially staggered along the vertical pipe section working steel pipe 2-1, and the semicircular ring support plates 5 are made of steel plates and are welded on the outer wall of the vertical pipe section working steel pipe 2-1.

[0024] See also Figure 1 The utility model discloses a connection structure of a buried steam pipe outlet elbow and a vertical pipe section, and a drain pipe 4 is arranged at the connection end of the outlet elbow 1 and the underground buried steam pipe. One end of the drain pipe 4 is connected to the bottom of the elbow working steel pipe 1-1, and the other end is connected to the external environment above the ground. The function of the drain pipe 4 is to discharge condensed water at the outlet elbow.

[0025] See also Figures 1 to 4 The utility model provides a connection structure of an underground elbow of a directly buried steam pipeline and a vertical pipe section, wherein the ground extending end elbow working steel pipe 1-1 of the underground elbow 1 and the elbow outer protective pipe 1-3 adopt an eccentric assembly structure, during the operation of the pipeline, the axial elongation of the working steel pipe of the directly buried steam pipeline caused by the thermal effect can be compensated by compressing the soft thermal insulation material. The utility model is provided with a rain cover 3 on the outer wall of the elbow working steel pipe 1-1 at the ground-extending end of the underground elbow 1. On the one hand, during the pipeline laying construction process, the underground elbow 1 is usually installed first, and after the direct buried steam pipeline is tested and qualified, it is connected with the overhead pipeline through the vertical pipe section 2. During this period, if it rains, the rain cover 3 can prevent rainwater from entering the insulation layer of the underground elbow 1; on the other hand, the eccentric assembly structure of the elbow working steel pipe 1-1 and the elbow outer protective pipe 1-3 makes the upper end face of the elbow outer protective pipe 1-3 at the ground-extending end of the underground elbow 1 elliptical, while the vertical pipe section outer protective pipe 2-3 is a circular bottom face, thereby making it difficult to achieve the docking of the two. At the same time, due to the difference in materials of the elbow outer protective pipe 1-3 and the vertical pipe section outer protective pipe 2-3, it is also difficult to connect the two. The utility model solves this problem by welding the rain cover 3 to the elbow outer protective pipe 1-3 and the vertical pipe section outer protective pipe 2-3 respectively. The utility model arranges a semicircular ring support plate 5 between the vertical pipe section working steel pipe 2-1 and the vertical pipe section outer protective pipe 2-3, which can not only avoid the problem of poor insulation effect caused by the falling of the insulation layer material of the vertical pipe section 2, but also effectively prevent the thermal bridge effect of heat propagation through the circumferential staggered arrangement between two adjacent groups of semicircular ring support plates 5.

Claims

1. A structure for connecting an underground elbow of a directly buried steam pipeline and a vertical pipe section, wherein the underground elbow (1) is provided with an elbow working steel pipe (1-1), an elbow insulation layer (1-2) and an elbow outer protective pipe (1-3) in sequence from the inside to the outside, one end of the underground elbow (1) is connected to the underground directly buried steam pipeline, and the other end extends vertically from the ground and is connected to the overhead steam pipeline through a vertical pipe section (2); the vertical pipe section (2) is provided with a vertical pipe section working steel pipe (2-1), a vertical pipe section insulation layer (2-2) and a vertical pipe section outer protective pipe (2-3) in sequence from the inside to the outside; the characteristics are as follows: The elbow working steel pipe (1-1) and the elbow outer protective pipe (1-3) at the ground-extending end of the aboveground elbow (1) are eccentrically assembled structures, and a rain cover (3) is arranged on the outer wall of the elbow working steel pipe (1-1) at the ground-extending end of the aboveground elbow (1).

2. The structure for connecting the direct buried steam pipeline elbow and the vertical pipe section according to claim 1 is characterized in that: The rain cover (3) is open downwards and is welded to the elbow working steel pipe (1-1) at the ground-extending end of the above-ground elbow (1) at the construction site. The rain cover (3) completely covers the elbow insulation layer (1-2) and the elbow outer protective pipe (1-3) at the ground-extending end of the above-ground elbow (1). The welding assembly height of the rain cover (3) matches the specific conditions of the construction site.

3. The structure for connecting the direct buried steam pipeline elbow and the vertical pipe section according to claim 2 is characterized in that: The offset direction of the elbow outer protective pipe (1-3) of the eccentric assembly structure of the ground elbow (1) is consistent with the flow direction of the medium in the steam pipeline.

4. The structure for connecting the direct buried steam pipeline elbow and the vertical pipe section according to claim 3 is characterized in that: A semicircular ring-shaped support plate (5) is provided between the vertical pipe section working steel pipe (2-1) and the vertical pipe section outer protective pipe (2-3); a plurality of groups of the semicircular ring-shaped support plates (5) are arranged along the central axis direction of the vertical pipe section (2); and adjacent groups are arranged in a staggered manner along the circumference of the vertical pipe section working steel pipe (2-1).

5. The structure for connecting the direct buried steam pipeline elbow and the vertical pipe section according to claim 4 is characterized in that: The semicircular ring-shaped support plate (5) is made of a steel plate and is welded onto the outer wall of the vertical pipe section working steel pipe (2-1).

6. The structure for connecting an underground elbow and a vertical pipe section of a directly buried steam pipeline according to any one of claims 1 to 5, characterized in that: A drain pipe (4) is provided at the connection end between the ground elbow (1) and the directly buried steam pipeline laid underground, one end of the drain pipe (4) being connected to the bottom of the elbow working steel pipe (1-1), and the other end being connected to the external environment above the ground.

7. The structure for connecting the direct buried steam pipeline elbow and the vertical pipe section according to claim 6 is characterized in that: The elbow insulation layer (1-2) is made of soft insulation material, and the elbow outer protective pipe (1-3) is made of a steel casing; the vertical pipe section insulation layer (2-2) is a composite structure of soft insulation material, hard insulation material and polyurethane foam material, and the vertical pipe section outer protective pipe (2-3) is made of galvanized iron sheet or steel plate or color steel plate.

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