CN117489917A - Prefabricated overhead steam pipe network with external sliding self-compensating structure of heat preservation pipe and heat preservation pipe manufacturing method - Google Patents
Prefabricated overhead steam pipe network with external sliding self-compensating structure of heat preservation pipe and heat preservation pipe manufacturing method Download PDFInfo
- Publication number
- CN117489917A CN117489917A CN202410002209.5A CN202410002209A CN117489917A CN 117489917 A CN117489917 A CN 117489917A CN 202410002209 A CN202410002209 A CN 202410002209A CN 117489917 A CN117489917 A CN 117489917A
- Authority
- CN
- China
- Prior art keywords
- heat preservation
- heat
- insulating layer
- pipe
- central
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004321 preservation Methods 0.000 title claims abstract description 78
- 238000004519 manufacturing process Methods 0.000 title abstract description 6
- 238000009413 insulation Methods 0.000 claims abstract description 57
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 54
- 239000010959 steel Substances 0.000 claims abstract description 54
- 239000012774 insulation material Substances 0.000 claims abstract description 14
- 238000005187 foaming Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 12
- 239000011491 glass wool Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 4
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 3
- 239000011496 polyurethane foam Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 65
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/06—Pipe-line systems for gases or vapours for steam
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
Abstract
The invention provides a prefabricated overhead steam pipe network with a self-compensating structure sliding outside a heat preservation pipe and a heat preservation pipe manufacturing method, which comprises the following steps: s1, welding and fixing a ring plate at one end of a working steel pipe, and installing an end heat-insulating layer on the working steel pipe at one side of the ring plate; s2, preparing a central heat-insulating layer at the other end of the end heat-insulating layer, and reserving a gap between the central heat-insulating layer and the end heat-insulating layer; s3, filling an expandable precompressed thermal insulation material in the gap; s4, sleeving and installing a prefabricated heat-insulating plug on the outer diameter of one end of the central heat-insulating layer; s5, sleeving the outer sleeve outside the central heat-insulating layer, and pouring and foaming in a gap between the outer sleeve and the central heat-insulating layer to form an outer heat-insulating layer. Compared with the on-site solution of thermal insulation compensation, the invention has the advantages that the thermal insulation compensation structure is arranged inside the thermal insulation pipe and is implemented in a factory workshop, so that the thermal insulation self-compensation of the thermal insulation pipe is ensured, and the problem of unreliable on-site thermal insulation compensation in the background is solved.
Description
Technical Field
The invention relates to a prefabricated overhead steam pipe network, in particular to a prefabricated overhead steam pipe network with a self-compensating structure sliding outside a heat preservation pipe and a heat preservation pipe manufacturing method.
Background
In the steam heating field, along with the continuous development of economy and continuous improvement of energy-saving requirements in China, prefabricated overhead steam heat-insulating pipes are increasingly used due to excellent heat-insulating performance and weather resistance; the China town heat supply society has issued and implemented a group standard of TCDHA 2-2019 overhead and utility tunnel prefabricated steam insulation pipe and pipe fitting of the product in 2019, and the technology of the product is further improved and improved through years of use and accumulation of experience in the use process, so that the group standard has been agreed to be upgraded into a national standard;
in the use process of the product, as the expansion coefficients of the working steel pipe and the heat insulation material are inconsistent, the expansion coefficient of the steel pipe is larger than that of the heat insulation material, so that the operation steam temperature is assumed to be 300 ℃ in the hot state operation, the expansion amount of each 12 m heat insulation pipe is about 40mm, and the expansion amount of a long straight pipeline is about 120 m and about 400mm; meanwhile, the operation modes of the prefabricated overhead tube at present are divided into two modes; an inner sliding type and an outer sliding type; when the operation mode is sliding, the expansion amount of all steam steel pipes is uniformly compensated at the joint of the tail end of the pipeline and the compensator, the compensation amount is 400mm, and when the operation mode is sliding, the expansion amount of each heat preservation pipe is compensated at the joint of each pipe, and the compensation amount is 40mm.
Regardless of the way of compensation, the current practice requires installation and construction of the compensation mechanism when the interface is insulated on site. However, because the interface is manufactured by field workers, the problems of uncontrollable quality, material loss during steal and the like exist, and the compensation mechanism cannot be correctly installed, a heat insulation gap can be generated, and in the field actual detection, a relatively high-temperature circumferential seam is often formed at the interface, which means that the heat insulation layer of the interface of the section is not effectively compensated and the heat dissipation loss is greatly increased. Thermal insulation compensation in the field often does not achieve the desired effect, resulting in a significant increase in heat loss from the pipeline that is not found.
Disclosure of Invention
Aiming at the defects of the existing heat preservation compensation technology and site construction, the invention provides the external sliding self-compensation structure of the prefabricated overhead heat preservation pipe, and the heat preservation compensation structure is arranged inside the heat preservation pipe and manufactured in a factory workshop by changing the manufacturing mode of the heat preservation compensation of the external sliding heat preservation pipe, so that the heat preservation self-compensation of the heat preservation pipe is ensured, and the problem that the site heat preservation compensation is unreliable in the background is solved. The specific scheme is as follows:
the utility model provides a prefabricated overhead steam pipe network of heat preservation outside slip self-compensating structure, prefabricated overhead steam pipe network includes a plurality of end to end's compound heat preservation pipe, compound heat preservation pipe includes the work steel pipe, be equipped with central heat preservation from inside to outside in proper order on the external diameter of work steel pipe, outer heat preservation and outer tube, be equipped with the end heat preservation of cover on the work steel pipe at the both ends of central heat preservation, all fixed mounting has the annular slab that is located between end heat preservation and the central heat preservation terminal surface at work steel pipe both ends, annular slab one side and end heat preservation butt, leave the clearance and fill the inflatable precompression heat preservation material between opposite side and the central heat preservation terminal surface, the clearance that forms between central heat preservation and the end heat preservation after the thermal expansion is heated to the compensation work steel pipe by the inflatable precompression heat preservation material.
Further, the expandable precompressed thermal insulation material is glass wool.
Further, the central heat-insulating layer consists of a plurality of inner heat-insulating layers;
the end heat-insulating layer is a sleeve pipe with multiple stages of steps axially arranged, each stage of step corresponds to one inner heat-insulating layer in the axial direction, and a gap is reserved between each stage of step and the end face of the inner heat-insulating layer and is filled with expandable precompressed heat-insulating materials.
Further, the annular plate is flush with the step of the inner layer close to the working steel pipe.
Further, the outer surface of the expandable precompressed thermal insulation material is wrapped by an annular steel plate, and two ends of the annular steel plate are overlapped and covered on the outer surfaces of the end thermal insulation layer and the central thermal insulation layer.
Further, a prefabricated heat-insulating plug is arranged between the central heat-insulating layer and the end face of the outer sleeve, and the outer heat-insulating layer is a foamed polyurethane foam layer.
The preparation method of the prefabricated overhead steam pipe network comprises the following steps:
s1, welding and fixing the annular plate on the working steel pipe, and installing the end heat-insulating layer on one side of the annular plate, which is close to the end part of the working steel pipe;
s2, preparing a central heat-insulating layer on the other side of the end heat-insulating layer, and reserving a gap between the central heat-insulating layer and the end heat-insulating layer;
s3, filling an expandable precompressed thermal insulation material in the gap;
s4, sleeving and installing a prefabricated heat-insulating plug on the outer diameter of one end of the central heat-insulating layer;
s5, sleeving the outer sleeve outside the central heat-insulating layer, and pouring and foaming in a gap between the outer sleeve and the central heat-insulating layer to form an outer heat-insulating layer.
The preparation method further comprises the following steps:
after the filling of the expandable pre-compression heat-insulating material is completed, wrapping an annular steel plate on the outer surface of the expandable pre-compression heat-insulating material, and overlapping and covering the two ends of the annular steel plate on the outer surfaces of the end heat-insulating layer and the central heat-insulating layer.
The invention has the advantages that:
1) A gap is reserved between the end heat preservation layer and the end face of the central heat preservation layer, and is filled with an expandable precompressed heat preservation material, when the heat-preservation device runs in a hot state, the gap can be elongated by the expansion amount of half working steel pipes, and at the moment, the compressed expandable precompressed heat preservation material can rebound and fills the pulled gap. Thereby ensuring that the heat preservation gap is always filled with glass wool due to thermal expansion and no thermal expansion joint exists.
2) Compared with the on-site solution of thermal insulation layer compensation, the invention has the advantages that the thermal insulation compensation structure is arranged inside the thermal insulation pipe and is produced and manufactured in a factory workshop, so that the thermal insulation self-compensation of the thermal insulation pipe is ensured, and the problem of unreliable on-site thermal insulation compensation in the background is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of one end of a single insulation pipe of a prefabricated overhead vapor pipe network provided by the invention;
FIGS. 2-8 are flowcharts of the process for manufacturing the insulating tube with the external sliding self-compensating structure according to the present invention; wherein,
FIG. 2 is a schematic view of the installation of a ring plate on a working steel pipe;
FIG. 3 is a schematic view of an end insulation layer installed on a working steel pipe at one side of a ring plate;
FIG. 4 is a schematic illustration of the preparation of a center insulation layer on a working steel pipe on one side of a ring plate, the gap being reserved between the center insulation layer and the end face of the end insulation layer and filled with an expandable precompressed insulation material;
FIG. 5 is a schematic view of the installation of a prefabricated thermal insulation plug at the end of a central thermal insulation layer;
FIG. 6 is a schematic illustration of an exterior cladding sheet of expandable precompressed insulation;
FIG. 7 is a schematic illustration of an outer sleeve sleeved outside a central insulating layer and foamed by pouring inside to form an outer insulating layer;
fig. 8 is a schematic diagram of the same flow process used to prepare the self-compensating structure at the other end of the working steel pipe.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the invention.
In order to provide a thorough understanding of the present invention, detailed steps and detailed structures will be presented in the following description in order to explain the technical solution of the present invention. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments in addition to these detailed descriptions.
Referring to fig. 1, the invention provides a prefabricated overhead steam pipe network with a self-compensating structure sliding outside a heat-insulating pipe, which is formed by connecting a plurality of composite heat-insulating pipes end to end, wherein each composite heat-insulating pipe comprises a working steel pipe 1, a ring plate 5 is welded on the outer diameter of the working steel pipe 1, a head heat-insulating layer 2 is wrapped on the left side of the ring plate 5, a center heat-insulating layer 9 is wrapped on the right side of the ring plate 5, a designed gap is reserved between the head heat-insulating layer 2 and the center heat-insulating layer 9, and an expandable precompressed heat-insulating material 6 is filled. An outer heat insulation layer 3 and an outer sleeve 4 are arranged outside the central heat insulation layer 9. Preferably, the material of the expandable pre-compression heat preservation material 6 is glass wool which is low in cost, easy to compress and has a certain expansion property after being compressed for a short time.
The product structure is in a factory state, and the central heat-insulating layer 9 is consistent with the expansion center of the working steel pipe 1 in the hot state operation; the end heat preservation layer 2 can displace along with the end of the expanded working steel pipe 1 under the pushing of the annular plate 5; the gap between the end insulation layer 2 and the central insulation layer 9 is filled with an expandable precompressed insulation material 6, which is stretched by the expansion of the half working steel pipe 1 when in hot operation, and the glass wool compressed for a short time is rebounded and fills the pulled gap. Thereby ensuring that the heat preservation gap is always filled with glass wool due to thermal expansion, and no thermal expansion joint of the heat preservation layer occurs. Meanwhile, the end heat preservation 2 and the end of the working steel pipe 1 keep consistent displacement, so that the length of the end of the working steel pipe 1 (the distance between the end of the working steel pipe 1 and the heat preservation end) cannot be increased in a perceptible way, the size of the heat preservation of the pipeline interface cannot be increased, and the length of the heat preservation interface in cold construction is always maintained. By the technical scheme, the heat preservation self-compensation of the prefabricated overhead heat preservation pipe can be realized. And the additional heat loss caused by the circumferential seam of the heat insulation layer is eliminated.
In an alternative embodiment, the central insulation layer 9 is composed of a plurality of inner insulation layers 9-1, and the end insulation layer 2 is a sleeve axially provided with a plurality of steps 2-1, each step 2-1 corresponds to one inner insulation layer 9-1 in the axial direction, and a gap is reserved between each step 2-1 and the end face of the inner insulation layer 9-1 and is filled with an expandable precompressed insulation material 6. Wherein the ring plate 5 is flush with the innermost step near the working steel pipe 1.
In an alternative embodiment, the outer surface of the expandable precompressed insulation 6 is wrapped with a steel sheet 7, the steel sheet 7 has a certain width, two ends of the steel sheet 7 overlap and cover the outer surfaces of the end insulation 2 and the central insulation 9, and a certain distance is left between the two ends of the steel sheet 7 and the expandable precompressed insulation 6, so that the steel sheet 7 completely covers the expanded expandable precompressed insulation 6 all the time no matter how far the end insulation 2 is displaced. When the multi-layer expandable precompression thermal insulation material 6 is arranged between the end thermal insulation layer 2 and the central thermal insulation layer 9, the steel plate 7 is only wrapped by the outermost expandable precompression thermal insulation material 6, and the rest of the expandable precompression thermal insulation materials 6 are positioned in the central thermal insulation layer 9, so that the steel plate is not needed to be wrapped.
In an alternative embodiment, a prefabricated thermal insulation plug 8 is arranged between the central thermal insulation layer 9 and the end face of the outer sleeve 4, and the outer thermal insulation layer 3 is a foamed polyurethane foam layer.
As shown in fig. 2 to 8, the preparation method of the present invention comprises the steps of:
s1, welding a ring plate 5 on a working steel pipe 1, as shown in FIG. 2; the left side of the working steel pipe 1 is wrapped with an end heat preservation layer 2, as shown in figure 3.
S2, preparing a central heat-insulating layer 9 on the right side of the annular plate 5, and reserving a designed gap between the central heat-insulating layer 9 and the end heat-insulating layer 2.
S3, filling an expandable pre-compression heat preservation material (glass wool) 6 in the gap, as shown in fig. 4.
S4, a prefabricated heat-insulating plug 8 is sleeved and installed on the outer diameter of one end of the central heat-insulating layer 9, as shown in FIG. 5. The outer surface of the expandable precompressed insulation 6 is then wrapped with steel plates 7, and the ends of the steel plates 7 overlap the outer surfaces of the end insulation 2 and the center insulation 9, as shown in fig. 6.
S5, the outer sleeve 4 is sleeved outside the central heat preservation layer 9, and an interlayer between the outer sleeve 4 and the central heat preservation layer 9 is poured and foamed to form the outer heat preservation layer 3, as shown in fig. 7.
Finally, both ends of the working steel pipe 1 are operated in this way, and the finished pipe is formed to have an external sliding self-compensating structure at both ends, as shown in fig. 8.
The preferred embodiments of the present invention have been described above. It is to be understood that the invention is not limited to the specific embodiments described above, wherein devices and structures not described in detail are to be understood as being implemented in a manner common in the art; any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modifications to equivalent embodiments without departing from the scope of the technical solution of the present invention, using the methods and technical contents disclosed above, without affecting the essential content of the present invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (8)
1. The utility model provides a prefabricated overhead steam pipe network of heat preservation outside slip self-compensating structure, prefabricated overhead steam pipe network includes a plurality of head-to-tail connection's compound heat preservation pipe, and compound heat preservation pipe includes work steel pipe (1), be equipped with central heat preservation (9), outer heat preservation (3) and outer tube (4) by interior outside in proper order on the external diameter of work steel pipe (1) the both ends of central heat preservation (9) are equipped with end heat preservation (2) of cover on work steel pipe (1), a serial communication port work steel pipe (1) both ends equal fixed mounting have be located end heat preservation (2) with annular slab (5) between the terminal surface of central heat preservation (9), annular slab (5) one side with end heat preservation (2) butt, the opposite side with leave the clearance and fill have expandable precompression heat preservation material (6) between the terminal surface of central heat preservation (9).
2. A prefabricated overhead vapour pipe network of an external sliding self-compensating structure for insulation according to claim 1, characterized in that the said inflatable precompressed insulation material (6) is glass wool.
3. A prefabricated overhead vapour pipe network of an external sliding self-compensating structure of a thermal insulation pipe according to claim 1, characterized in that the central thermal insulation layer (9) consists of a plurality of internal thermal insulation layers (9-1);
the end heat-insulating layer (2) is a sleeve with multiple steps axially arranged, each step corresponds to an inner heat-insulating layer (9-1) in the axial direction, and gaps are reserved between each step (2-1) and the end face of the inner heat-insulating layer (9-1) and are filled with the expandable precompressed heat-insulating material (6).
4. A prefabricated overhead vapour pipe network of external sliding self-compensating construction for thermal insulation pipes according to claim 3, characterised in that the ring plate (5) is flush with the inner step adjacent to the working steel pipe (1).
5. The prefabricated overhead steam pipe network of the external sliding self-compensating structure of the heat preservation pipe according to claim 1, characterized in that the outer surface of the expandable precompressed heat preservation material (6) is wrapped with an annular steel plate (7), and two ends of the annular steel plate (7) are overlapped and covered on the outer surfaces of the end heat preservation layer (2) and the central heat preservation layer (9).
6. The prefabricated overhead steam pipe network of the external sliding self-compensating structure of the heat preservation pipe according to claim 1, characterized in that a prefabricated heat preservation plug (8) is arranged between the central heat preservation layer (9) and the end face of the outer sleeve (4), and the external heat preservation layer (3) is a foaming polyurethane foam layer.
7. A method for preparing a prefabricated overhead vapor pipe network according to any one of claims 1-6, comprising the steps of:
s1, welding and fixing the annular plate (5) on the working steel pipe (1), and installing the end heat-insulating layer (2) on one side of the annular plate (5) close to the end part of the working steel pipe (1);
s2, preparing the central heat-insulating layer (9) on the other side of the end heat-insulating layer (2), and reserving a gap between the central heat-insulating layer (9) and the end heat-insulating layer (2);
s3, filling an expandable precompressed thermal insulation material (6) in the gap;
s4, sleeving and installing the prefabricated heat-insulating plug (8) on the outer diameter of one end of the central heat-insulating layer (9);
s5, sleeving the outer sleeve (4) outside the central heat-insulating layer (9), and filling and foaming in a gap between the outer sleeve (4) and the central heat-insulating layer (9) to form the outer heat-insulating layer (3).
8. The method of preparing as claimed in claim 7, further comprising:
after the expandable pre-compression heat preservation material (6) is filled, an annular steel plate (7) is wrapped on the outer surface of the expandable pre-compression heat preservation material (6), and two ends of the annular steel plate (7) are overlapped and covered on the outer surfaces of the end heat preservation layer (2) and the central heat preservation layer (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410002209.5A CN117489917A (en) | 2024-01-02 | 2024-01-02 | Prefabricated overhead steam pipe network with external sliding self-compensating structure of heat preservation pipe and heat preservation pipe manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410002209.5A CN117489917A (en) | 2024-01-02 | 2024-01-02 | Prefabricated overhead steam pipe network with external sliding self-compensating structure of heat preservation pipe and heat preservation pipe manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117489917A true CN117489917A (en) | 2024-02-02 |
Family
ID=89685463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410002209.5A Pending CN117489917A (en) | 2024-01-02 | 2024-01-02 | Prefabricated overhead steam pipe network with external sliding self-compensating structure of heat preservation pipe and heat preservation pipe manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117489917A (en) |
-
2024
- 2024-01-02 CN CN202410002209.5A patent/CN117489917A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103968190B (en) | Prefabricated overhead heat insulation pipe | |
| CN110469748B (en) | Prefabricated overhead low-energy-consumption steam pipe network long-distance conveying system | |
| CN103383053B (en) | The insulating structure part of pipeline | |
| CN117489917A (en) | Prefabricated overhead steam pipe network with external sliding self-compensating structure of heat preservation pipe and heat preservation pipe manufacturing method | |
| CN203099219U (en) | Heat insulation structure member of pipeline | |
| CN103727359B (en) | The pipe insulation construction method of a kind of many solidifying foam glass material and device thereof | |
| CN109058635A (en) | Prefabricated thermal insulation bilayer bend pipe and preparation method thereof | |
| CN110594532A (en) | Composite heat-insulation prefabricated overhead steam heat-insulation pipe and processing technology thereof | |
| CN116608367A (en) | Insulation structure and method for external sliding prefabricated overhead insulation pipe joint | |
| CN113757488B (en) | Prepreg type pipeline heat preservation device, construction method and construction equipment thereof | |
| CN214744196U (en) | Soft and hard combined type heat preservation structure of overhead steam pipeline | |
| CN216408186U (en) | Prefabricated polyurethane heat-preservation fixed heat-insulation pipe bracket | |
| CN210890616U (en) | Compound heat-preservation prefabricated overhead steam heat-preservation pipe | |
| CN214744198U (en) | Soft prefabricated built on stilts steam insulating tube | |
| CN216555741U (en) | Zero heat leakage prefabricated overhead steam heat-preservation pipe | |
| CN210800465U (en) | Fixed pipe bracket for prefabricated finished product heat-insulating pipe | |
| CN209245580U (en) | The foaming of hard polyaminoester mold is combined insulating tube with polyethylene winding | |
| RU114503U1 (en) | FIXED BRACKET WITH POLYURETHANE INSULATION | |
| CN219221674U (en) | Joint coating device applied to prefabricated directly-buried heat-insulation pipeline | |
| CN115199866B (en) | Soft prefabricated overhead steam heat-insulating pipe and manufacturing method and joint coating method thereof | |
| CN205560131U (en) | Thermal -insulated fixed bolster of prefabricated directly -buried steam pipe nanometer | |
| CN110375154A (en) | Prefabricated keeps the temperature effective fixed pipe bracket | |
| CN114110297B (en) | Plastic sleeve steel steam direct-buried prefabricated pipeline and construction joint repairing method | |
| CN214425441U (en) | Assembled built on stilts insulating tube | |
| CN108767797A (en) | A kind of intermediate heat-insulated cable protection pipe of double glazing steel for filling bubble |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |