CN110594534A - Insulating internal fixing support of prefabricated direct-buried steam heat-insulating pipe - Google Patents
Insulating internal fixing support of prefabricated direct-buried steam heat-insulating pipe Download PDFInfo
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- CN110594534A CN110594534A CN201910680252.6A CN201910680252A CN110594534A CN 110594534 A CN110594534 A CN 110594534A CN 201910680252 A CN201910680252 A CN 201910680252A CN 110594534 A CN110594534 A CN 110594534A
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- pipe
- insulating
- flange
- prefabricated direct
- buried steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/12—Arrangements for supporting insulation from the wall or body insulated, e.g. by means of spacers between pipe and heat-insulating material; Arrangements specially adapted for supporting insulated bodies
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
Abstract
The invention relates to the technical field of direct-buried steam pipelines and discloses an insulating internal fixed support of a prefabricated direct-buried steam heat-insulating pipe. The support solves the problems of heat insulation and partition between the steel outer protecting pipe and the working pipe of the prefabricated direct-buried steam pipeline, and enables the steel outer protecting pipe to be insulated from the working pipe, thereby solving the insulation problem of the cathode protection of the outer protecting pipe, reducing the cathode protection current leakage of the outer protecting pipe, enabling the outer protecting pipe to obtain safe and effective cathode protection, slowing down the corrosion speed of the outer protecting pipe and ensuring the service life of the direct-buried steam pipeline.
Description
Technical Field
The invention belongs to the technical field of direct-buried steam pipelines, and particularly relates to a prefabricated heat-insulation pipe fitting-partition type insulated internal fixed support in a prefabricated direct-buried steam heat-insulation pipe.
Background
In recent years, as the urban related departments pay more and more attention to urban landscapes, the prefabricated direct-buried steam pipeline is widely applied to central heating/cooling in industrial parks and southern regions, and with the implementation of the technical code CJJ/T104-2014 of urban heating direct-buried steam pipeline, the outer protection pipe of the direct-buried steam pipeline adopts an outer anticorrosive layer and simultaneously adopts cathode protection measures. Meanwhile, according to the standard of electrical insulation of cathode protection pipelines (SY/T0086-2012), an insulating measure should be taken for the steel outer protective pipe so as to avoid forming a conductive path with other non-protection pipelines.
Because the direct-buried steam pipeline system needs to be provided with the internal fixed support, in order to prevent the compensation sections from mutually crossing steam during the moisture discharge period, the internal fixed support is generally designed into a partition type, and a metal structure is welded between the working pipe and the outer protective pipe, so that the working pipe and the outer protective pipe form a conductive passage. The overhead section steam pipeline working pipe has a grounding device, because the steam temperature far exceeds the service temperature of an insulating joint (or an insulating flange), the buried section steam pipeline working pipe and the overhead section steam pipeline working pipe cannot be insulated, so that the direct-buried steam pipeline steel outer protection pipe and the grounding device of the overhead section form a conductive path, the cathodic protection current of the direct-buried steam pipeline steel outer protection pipe runs off through the working pipe and the grounding device, the anode output current load is overlarge, the protection potential polarization cannot be achieved, the preset protection requirement cannot be met, and the service life of a sacrificial anode is greatly shortened. The steel outer protective pipe of the directly buried steam pipeline has insufficient protective potential, even loses the cathodic protection, will accelerate the corrosion rate, shorten life.
In the prior art, the adopted internal fixed support mainly comprises the following two types:
firstly, adopt reducing pipe welded work pipe and outer pillar respectively, as shown in figure 1, in order to prevent that the outer pillar temperature is high, the steel pipe is protected outward to the outer outside of pillar additional layer, sets up insulation material between the outer pillar of the ectonexine. The heat transfer length of the thrust transfer component of the internal fixed support in the structure is about 1.0m, the internal fixed support has certain heat insulation effect, the internal fixed support can be divided into two spaces, and the working pipe and the outer protective pipe form a conductive path. In addition, because the inner and outer layers of outer protective pipes have different temperatures, the inner stress of the outer protective pipes is larger, and the inner layer of outer protective pipes and fillet welds are easy to damage.
Another method adopts metal corrugations to weld the working pipe and the outer protective pipe respectively, as shown in FIG. 2, the surface temperature of the outer protective pipe is higher because the heat conductivity coefficient of the heat insulating material between the inner fixed support ring plates is high. And a layer of outer protection steel pipe is added outside the outer protection pipe, and a heat insulation material is arranged between the inner and outer layer of outer protection pipes. The heat transfer length of the thrust transfer component of the internal fixed support of the structure is about 0.8m, the internal fixed support can be divided into two spaces after the corrugated pipe is welded, but the working pipe and the external protective pipe form a conductive path. In addition, because the inner and outer layers of outer protection pipes have different temperatures, the inner and outer layers of outer protection pipes have different thermal expansion lengths, the outer layer is pulled, the inner layer is pressed, the stress is larger, and the inner layer of outer protection pipe and the fillet weld are easy to damage.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an insulating internal fixed support for a prefabricated direct-buried steam heat-preservation pipe, which solves the problems of heat insulation and partition between a steel outer protection pipe and a working pipe of the prefabricated direct-buried steam pipeline, has no temperature difference in a metal structure, insulates the steel outer protection pipe from the working pipe, reduces the leakage of cathode protection current of the outer protection pipe, slows down the corrosion of the outer protection pipe, and ensures the service life of the direct-buried steam pipeline.
In order to achieve the purpose, the invention adopts the following technical scheme:
a prefabricated direct-buried steam insulation pipe insulation internal fixing support comprises a thrust transmission component, wherein one end of the thrust transmission component is connected with a working pipe through an annular steel plate, a plurality of rib plates are uniformly arranged on the annular steel plate, and the other end of the thrust transmission component is connected with an outer protection pipe through an insulation flange; the insulating flange comprises a bolt, a nut, a flange I and a flange II, an insulating sealing element is arranged between the flange I and the flange II, a bolt insulating sleeve is sleeved outside a screw rod of the bolt, the screw rod sequentially penetrates through the flange I, the insulating sealing element and the flange II to be fixedly connected with the nut, the flange I is connected with a thrust transmission component, and the flange II is connected with an outer protective pipe.
Preferably, the number of the insulation flanges is at least two, and the insulation flanges are uniformly welded along the circumferential direction of the transmission member.
Preferably, the thrust transmission member is a cylindrical steel pipe having a length of 1.2m or more.
Preferably, the outer protecting pipe is provided with a moisture exhaust pipe and a moisture exhaust pipe outer protecting pipe.
The invention has the beneficial effects that: in this application, the one end and the working pipe of interior fixing support's thrust transmission component adopt welded connection, and the other end adopts insulating component to be connected with the outer pillar, both keeps apart two spaces with interior fixing support branch, makes outer pillar and working pipe insulating again, and then makes the outer pillar to the ground and have good insulation to the non-protection pipeline section, can obtain the polarization potential of homogeneity with minimum protection current, reaches the most economic, most effectual protection effect, slows down the outer pillar and corrodes, guarantees its life. Meanwhile, the thrust transfer component has a good heat insulation effect, and the surface temperature of the outer protective pipe at the fixed support is reduced.
Drawings
FIG. 1 is a schematic diagram of an internal fixing support in the prior art;
FIG. 2 is a schematic view of another internal fixing support in the prior art;
FIG. 3 is a schematic structural view of a partitioned insulating internal fixing support in embodiment 1;
FIG. 4 is an enlarged view taken at I in FIG. 3;
FIG. 5 is a cross-sectional view taken along the line A-A in FIG. 3;
FIG. 6 is a schematic structural view of a partitioned insulating internal fixing support in embodiment 2;
FIG. 7 is an enlarged view at H in FIG. 6;
FIG. 8 is a cross-sectional view taken along line B-B of FIG. 6;
FIG. 9 is a cross-sectional view taken along plane C-C of FIG. 6;
in the figure, 1 is a working pipe, and 2 is an outer protective pipe. 3-thrust transfer component, 4-ribbed plate, 5-annular steel plate, 6-moisture-removing pipe outer protective pipe, 7-moisture-removing pipe, 8-bolt, 9-nut, 10-flange I, 11-insulating sealing element, 12-bolt insulating sleeve and 13-flange II.
Detailed Description
For purposes of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings and examples, it being understood that the specific examples described herein are for illustrative purposes only and are not intended to limit the present invention.
Example 1
A prefabricated direct-buried steam insulation pipe insulation internal fixing support comprises a thrust transfer component 3, as shown in figures 3-5, preferably, the thrust transfer component 3 is a cylindrical steel pipe, the length of the thrust transfer component is greater than or equal to 1.2m, so that the heat transfer distance is ensured to be more than 1.4m, and a good heat insulation effect is ensured; the one end of thrust transmission component 3 is passed through annular steel sheet 5 and is welded with work pipe 1, all has a plurality of floor 4 on the annular steel sheet 5, 4 both sides of floor respectively with transmission component 3 and work pipe welding, the other end of thrust transmission component 3 is through the welding of a plurality of evenly distributed insulating flange and outer pillar 2, both can keep apart two spaces with interior fixing support like this, make outer pillar 2 again with work pipe 1 insulating.
The insulating flange comprises a bolt 8, a nut 9, a flange I10 and a flange II 13, an insulating sealing element 11 is arranged between the flange I10 and the flange II 13, a bolt insulating sleeve 12 is sleeved outside a screw rod of the bolt 8, and the screw rod penetrates through the flange I10, the insulating sealing element 11 and the flange II 13 in sequence and then is fixedly connected with the nut 9; the flange I10 is connected with the thrust transfer component 3 in a welding mode, and the flange II 13 is connected with the inner wall of the outer protecting pipe in a welding mode.
Further, the diameter of the thrust transmission component 3 is smaller than that of the outer protection pipe 2, the diameters of the flange I10 and the flange II 13 are different, preferably, the flange I10, the flange II 13 and the insulating sealing element 11 are circular, and the positions of bolt holes of the flange I10, the flange II 13 and the insulating sealing element 11 can be customized; two moisture discharge pipes 7 are arranged on the outer protecting pipe 2, a moisture discharge pipe outer protecting pipe 6 is arranged outside the moisture discharge pipe 7, and the two moisture discharge pipes 7 are located at two ends of the transmission component 3 and are respectively communicated with two spaces separated by the fixed support.
The installation method specifically comprises the following steps:
s1, firstly, connecting a bolt, a nut, a bolt insulating sleeve, a flange I, a flange II and an insulating sealing element to form an insulating component; then welding the thrust transfer component, the ribbed plate, the annular steel plate, the insulating component and the like into a whole according to the drawing;
and S2, finishing winding the heat-insulating layer of the working pipe, inserting the whole prepared in the previous step, and welding the rib plates, the annular steel plate and the working pipe.
S3, finishing winding the thermal insulation layer of the thrust transfer component, inserting the outer protecting pipe, and welding the welding flange II with the outer protecting pipe with the inner wall of the outer protecting pipe.
S4, welding and manufacturing the moisture exhaust pipe and the outer protection pipe of the moisture exhaust pipe, and finishing the outer protection pipe and the anticorrosive layer outside the outer protection pipe of the moisture exhaust pipe.
Example 2
The utility model provides an insulating internal fixation support of prefabricated direct-burried steam insulating tube, as shown in fig. 6 ~ 9, it lies in with embodiment 1 difference: the outer protecting pipe 2 is welded with a reducing pipe 2.1 and an enlarged outer protecting pipe 2.2, two ends of the enlarged outer protecting pipe 2.2 are welded with the outer protecting pipe 2 through the reducing pipe 2.1, and the diameter of the enlarged outer protecting pipe 2.2 is larger than that of the outer protecting pipe 2; the two moisture discharge pipes are arranged on the enlarged outer protecting steel pipe 2.2 and are respectively communicated with two spaces separated by the inner fixed support; in addition, the flange I10 and the flange II 13 have the same specification and are respectively welded with the thrust transmission component 3 and the outer protection pipe 2, and the diameter of the thrust transmission component 3 is the same as that of the outer protection pipe 2.
The installation method comprises the following steps:
s1, firstly, connecting a bolt, a nut, a bolt insulating sleeve, a flange I, a flange II and an insulating sealing element to form an insulating component; then welding the thrust transfer component, the ribbed plate, the annular steel plate, the insulating component and the like into a whole according to the drawing;
s2, finishing winding the heat-insulating layer of the working pipe, inserting the whole prepared in the previous step, welding the rib plates and the annular steel plate with the working pipe, and welding the flange II with the outer protective pipe 2.
S3, welding the outer protecting pipe 2, a reducing pipe 2.1 and an enlarged outer protecting steel pipe 2.2 into a whole; and finishing winding the heat-insulating layer of the thrust transfer component, inserting the welded outer protection pipe into a whole, and welding the outer protection pipe with the other reducing pipe 2.1 and the outer protection pipe 2.
S4, welding and manufacturing the moisture exhaust pipe and the outer protection pipe of the moisture exhaust pipe, and finishing the outer protection pipe and the anticorrosive layer outside the outer protection pipe of the moisture exhaust pipe.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The insulating internal fixed support for the prefabricated direct-buried steam heat-insulating pipe is characterized by comprising a thrust transfer component (3), wherein one end of the thrust transfer component (3) is connected with a working pipe (1) through an annular steel plate (5), and the other end of the thrust transfer component (3) is connected with an outer protective pipe (2) through an insulating flange;
the insulating flange comprises a bolt (8), a nut (9), a flange I (10) and a flange II (13), an insulating sealing element (11) is arranged between the flange I (10) and the flange II (13), a screw rod outer sleeve of the bolt (8) is provided with a bolt insulating sleeve (12) and penetrates through the flange I (10), the insulating sealing element (11) and the flange II (13) in sequence to be connected and fixed with the nut (9), the flange I (10) is connected with a transmission component (3), and the flange II (13) is connected with an outer protective pipe.
2. The insulating internal fixing support for the prefabricated direct-buried steam insulating pipe according to claim 1, characterized in that the insulating flanges are at least two and are uniformly welded along the circumferential direction of the transfer member (3).
3. The insulating internal fixing support for the prefabricated direct-buried steam insulating pipe as claimed in claim 1, characterized in that a plurality of ribs (4) are uniformly arranged on the annular steel plate (5).
4. The insulating internal fixed support of the prefabricated direct-burried steam insulating pipe according to claim 1, characterized in that, the thrust transmission component (3) is a cylindrical steel pipe.
5. The insulating internal fixed support of a prefabricated direct-burried steam insulating pipe according to claim 4, characterized in that the length of the thrust transmission component (3) is greater than or equal to 1.2 m.
6. The insulating internal fixed support for the prefabricated direct-buried steam insulating pipe according to claim 1, characterized in that the outer protecting pipe (2) is provided with a moisture exhausting pipe (7) and a moisture exhausting pipe external protecting pipe (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910680252.6A CN110594534B (en) | 2019-07-26 | 2019-07-26 | Insulating internal fixing support of prefabricated direct-buried steam heat-insulating pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910680252.6A CN110594534B (en) | 2019-07-26 | 2019-07-26 | Insulating internal fixing support of prefabricated direct-buried steam heat-insulating pipe |
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| Publication Number | Publication Date |
|---|---|
| CN110594534A true CN110594534A (en) | 2019-12-20 |
| CN110594534B CN110594534B (en) | 2021-01-19 |
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| CN201910680252.6A Active CN110594534B (en) | 2019-07-26 | 2019-07-26 | Insulating internal fixing support of prefabricated direct-buried steam heat-insulating pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115076522A (en) * | 2022-05-05 | 2022-09-20 | 中国市政工程中南设计研究总院有限公司 | Insulating partition of prefabricated direct-buried steam heat-preservation pipe |
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| JPS6456888A (en) * | 1987-08-28 | 1989-03-03 | Nippon Kokan Kk | Corrosion preventing method for steel casing pipe and buried pipe using the same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115076522A (en) * | 2022-05-05 | 2022-09-20 | 中国市政工程中南设计研究总院有限公司 | Insulating partition of prefabricated direct-buried steam heat-preservation pipe |
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| CN110594534B (en) | 2021-01-19 |
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