CN104075077A - Heat insulating material for repairing heat pipeline and preparation method and application thereof - Google Patents
Heat insulating material for repairing heat pipeline and preparation method and application thereof Download PDFInfo
- Publication number
- CN104075077A CN104075077A CN201410255364.4A CN201410255364A CN104075077A CN 104075077 A CN104075077 A CN 104075077A CN 201410255364 A CN201410255364 A CN 201410255364A CN 104075077 A CN104075077 A CN 104075077A
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- CN
- China
- Prior art keywords
- heat distribution
- repairing
- distribution pipeline
- thermoinsulation
- thermoinsulation material
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/064—Silica aerogel
-
- 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
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
Abstract
The invention provides a heat insulating material for repairing a heat pipeline. The heat insulating material consists of 50-99 parts by weight of CGM (High-Strength Non-Shrink Grouting Material), 1-50 parts by weight of silicon dioxide aerogel and the balance of water, wherein the adding amount of water is 10-30 percent by weight based on the total weight of the CGM and the silicon dioxide aerogel; the silicon dioxide aerogel is silicon dioxide aerogel powder of which the particle diameter is 90-150 meshes. A preparation method of the heat insulating material comprises the following steps: firstly, mixing a certain amount of CGM with silicon dioxide aerogel; adding a certain amount of water into the mixture, and uniformly stirring to form the heat insulating material. During use, the heat insulating material needs to be cured at the normal temperature, and can be continuously cured for 2-6 hours at the temperature of 50 DEG C after being cured at the normal temperature for 24-96 hours. The heat insulating material is simple in formula, and can be formed by curing at the normal temperature.
Description
Technical field
The present invention relates to a kind of thermoinsulation material, be specifically related to a kind of thermoinsulation material and its preparation method of repairing for heat distribution pipeline, and the application of this thermoinsulation material, heating pipeline field of engineering technology belonged to.
Background technique
In the field such as central heat supply, central cooling, the normal heating pipeline that adopts carrys out the media such as delivering vapor, cold water or hot water, heating pipeline is formed by connecting by heat distribution pipeline, conventional heat distribution pipeline comprises interior delivery pipe, outer protecting shell body and the heat insulation layer between outer protecting shell body and interior delivery pipe conventionally, heat distribution pipeline has good thermal insulation property, thereby can reduce the heat loss in medium transmission process.For directly buried heat distribution pipeline line, in pipe network During Process of Long-term Operation, the medium of high temperature can allow heat insulation layer aging gradually; In addition, the damage of outer protecting shell body can cause the aqueous vapor in external environment to enter into heat insulation layer, the high-temperature water that the water that enters heat insulation layer forms after by the dielectric heating in interior delivery pipe can accelerate the aging of heat insulation layer, heat insulation layer volume after aging can reduce, thereby make to occur in heat insulation layer cavity, and then greatly reduce the heat-insulating property of heating pipeline, make pipe network heat heavy losses; In addition, high-temperature water flows in the cavity of the aging formation of heat insulation layer, progress into after inspection shaft, above well lid, there will be the phenomenon of " emitting hot gas ", even the more shallow pipeline of some buried depth, directly emerges from ground, not only affect environment, even also can cause security incident, therefore need to repair in time the heat distribution pipeline damaging, safeguard the normal operation of heating pipeline.
At present, the conventional method of heat distribution pipeline reparation is excavated pavement, original pipeline entirety is taken out and is used new heat distribution pipeline to replace the pipeline of damage, or on interior delivery pipe, reconfigure new thermal insulation layer, reinstalls outer protecting shell body, and entirety is imbedded underground.But the restorative procedure of this excavated pavement is subject to the restriction of municipal administration aspect, and construction period is relatively long, brings inconvenience to urban transportation.
For this reason, Chinese patent literature CN101619798A discloses the slurry of a kind of direct-embedded heating pipeline insulating layer non-evacuation process and the use of above-mentioned technique, it is to utilize former pipeline to be located at ground two inspection shafts that face mutually, holed in frame two ends, first utilize high pressure draught that discarded thermal insulating material damaged, efflorescence is discharged, recycling relevant device injects thermal insulating material between outer casing and inner tube, to form new thermal insulation layer.Above-mentioned thermal insulating material is made up of sepiolite, perlite, expansive soil, dustless asbestos, quickly penetrating agent, aluminosilicate fiber cotton, carboxymethyl cellulose, silica gel, quickly penetrating agent, organosilicon material and the water of certain proportioning.This thermal insulating material is grouped into by ten kinds of above one-tenth, for reaching application target, the proportioning of each composition needs in the strict required scope of controlling, composition proportion complexity, and because the constituent of this thermal insulating material comprises multiple inorganic material and multiple organic material, after it has been solidified, fully combination between inorganic molecule and organic molecule, the material forming after causing thermal insulating material to solidify has the crack of can naked-eye observation arriving, the space (or crack) distributing in thermal insulation layer has not only reduced the intensity of thermal insulation layer, more reduce the heat insulation effect of thermal insulation layer, if still there will be the phenomenon of " emitting hot gas " in external environment behind moisture content infiltration thermal insulation layer space simultaneously, thereby accelerate the aging of new thermal insulation layer, reduce the working life of thermal insulation layer.
In addition, in the solidification process of above-mentioned thermal insulating material, need to utilize heat distribution pipe network to the logical steam of working steel tube, slurry is slowly warming up to after 150-160 DEG C, insulation 70-80 hour, heat in process, the moisture of insulation slip is discharged by the humidity discharging pipe of both-side opening and former pipeline.In above-mentioned solidification process, need to carry out high temperature auxiliary processing to thermal insulating material, and holding time is longer, cause the waste of the energy.
Summary of the invention
For solving in prior art, after heat distribution pipeline repair materials formula is complicated, curing, easily form crack, reduce heat insulation effect, affect the thermal insulation layer problem in working life, and existing thermal insulating material solidification process loaded down with trivial details, need long problem of high temperature and curing time, the invention provides a kind of simple, normal temperature solidified thermal insulating material of filling a prescription.
For this reason, the technological scheme that the application takes is:
A thermoinsulation material of repairing for heat distribution pipeline, comprises CGM grouting material and aerosil.
The above-mentioned thermoinsulation material of repairing for heat distribution pipeline, comprises 50-99 weight portion CGM grouting material and 1-50 weight portion aerosil.
The above-mentioned thermoinsulation material of repairing for heat distribution pipeline, also comprises water, and the addition of described water is the 10-30wt% of the total amount of described CGM grouting material and described aerosil.
The above-mentioned thermoinsulation material of repairing for heat distribution pipeline, comprises 90-99 weight portion CGM grouting material and 1-10 weight portion aerosil.
The above-mentioned thermoinsulation material of repairing for heat distribution pipeline, described aerosil is particle diameter 90-150 object aerosil powder.
The present invention also provides the preparation method of the above-mentioned thermoinsulation material of repairing for heat distribution pipeline, comprises a certain amount of CGM grouting material and aerosil are mixed.
The preparation method of the above-mentioned thermoinsulation material of repairing for heat distribution pipeline, also comprises, in the mixture of CGM grouting material and aerosil, adds a certain amount of water, and the process stirring.
The application of the above-mentioned thermoinsulation material of repairing for heat distribution pipeline, solidifies at normal temperatures.
Above-mentioned process of solidifying at normal temperatures for the thermoinsulation material of heat distribution pipeline reparation, maintenance ambient humidity is 50%-55%.
The above-mentioned thermoinsulation material of repairing for heat distribution pipeline solidifies after 24-96h at normal temperatures, continues to solidify 2-6h at 50 DEG C.
Above-mentioned for heat distribution pipeline repair thermoinsulation material at described solidification process, at described thermoinsulation material surface sprinkling water so that described thermoinsulation material is carried out to maintenance.
A kind of heat distribution pipeline, comprises the heat insulation layer being formed by the above-mentioned thermoinsulation material of repairing for heat distribution pipeline.
Above-mentioned heat distribution pipeline also comprises interior delivery pipe and plastic casing, and described heat insulation layer is arranged between described interior delivery pipe and described plastic casing.
Compared with prior art, tool of the present invention has the following advantages:
1, CGM grouting material is usually used in foot bolt fastening, runway repairing, nuclear power generating equipment is fixed, road and bridge engineering is reinforced, machinery bed, steel structure and ground Huai Kou, the back-grouting of equipment Foundations, reinforcing bar is buried in cultivation, concrete structure reinforcement and transformation, mechanical and electric equipment installation, track and Steel Structure Installation, static press piling engineering envelope stake etc., why hanker after using CGM grouting material in these occasions, be because its to have mobile performance fine, be easy to heat radiation, the feature that setting time is short and intensity is high, can realize the quick hardening of repair materials, and durability and good weatherability.But, because it is easy to heat radiation and solidifies the rear easily shortcoming of cracking, limited its application as thermal insulating material.And the applicant passes through performing creative labour, CGM grouting material is combined with aerosil, form a kind of thermal conductivity low, the thermoinsulation material of good flowing properties, by add aerosil in CGM grouting material, make the mixed adiabatic slurry can spontaneous curing, do not need heating, and the material forming after the solidifying crackle that do not have naked eyes can observe.
2, the thermoinsulation material of repairing for heat distribution pipeline of the present invention, after normal temperature cure certain hour, is elevated to solidifying temperature at 50 DEG C and continues to solidify, and the thermoinsulation material thermal conductivity of the thermoinsulation material thermal conductivity ratio normal temperature cure obtaining is low.
3, the thermoinsulation material of repairing for heat distribution pipeline of the present invention, selecting particle size range is 90-150 object aerosil, the thermal conductivity of adiabatic slurry that now obtains is lower and intensity is higher.
4, the thermoinsulation material of repairing for heat distribution pipeline of the present invention, in solidification process, certain interval of time carries out wet curing, or in solidification process, keeps ambient humidity in 50-55%, can further ensure that thermoinsulation material is curing without being chapped from the cold.
Embodiment
The CGM grouting material that the application selects can be selected commercially available all CGM grouting materials.
Embodiment 1
(1) be that 100 object aerosils mix by 99g CGM grouting material (Beijing tripod flourishing age grand engineering Co., Ltd, CGM-1 grouting material) and 1g particle diameter;
(2) in the mixture of CGM grouting material and aerosil, add 30g water, and stir, form the required thermoinsulation material of repairing for heat distribution pipeline.
(3) the described thermoinsulation material of repairing for heat distribution pipeline is solidified to 72h at normal temperatures, obtain the thermoinsulation material sample S1 after solidifying, visually observe this solidified sample without cracking phenomena.
Embodiment 2
(1) be that 110 object aerosils mix by 95g CGM grouting material (Beijing tripod flourishing age grand engineering Co., Ltd, CGM-1 grouting material) and 5g particle diameter;
(2) in the mixture of CGM grouting material and aerosil, add 28g water, and stir, form the required thermoinsulation material of repairing for heat distribution pipeline.
(3) the described thermoinsulation material of repairing for heat distribution pipeline is solidified to 96h at 22 DEG C, obtain the thermoinsulation material sample S2 after solidifying, this solidified sample of naked-eye observation, without cracking phenomena, was sprayed a small amount of water every 8 hours at material surface in above-mentioned solidification process, so that product is carried out to maintenance.
Embodiment 3
(1) be that 150 object aerosils mix by 50g CGM grouting material (Beijing tripod flourishing age grand engineering Co., Ltd, CGM-1 grouting material) and 50g particle diameter;
(2) in the mixture of CGM grouting material and aerosil, add 10g water, and stir, form the required thermoinsulation material of repairing for heat distribution pipeline.
(3) the described thermoinsulation material of repairing for heat distribution pipeline is solidified to 72h at normal temperatures, obtain the thermoinsulation material sample S3 after solidifying, this solidified sample is without cracking phenomena.
Embodiment 4
(1) be that 90 object aerosils mix by 90g CGM grouting material (Shandong Tuo Da building materials Co., Ltd, CGM380 grouting material) and 10g particle diameter;
(2) in the mixture of CGM grouting material and aerosil, add 25g water, and stir, form the required thermoinsulation material of repairing for heat distribution pipeline.
(3) the described thermoinsulation material of repairing for heat distribution pipeline is solidified to 96h at 25 DEG C, obtain the thermoinsulation material sample S4 after solidifying, this solidified sample is without cracking phenomena, in above-mentioned solidification process, sprayed a small amount of water every 8 hours at material surface, so that product is carried out to maintenance, obtain the solidified sample without cracking.
Embodiment 5
(1) be that 100 order aerosils mix by 60g CGM grouting material (Guangzhou Tuo Da building materials Co., Ltd, CGM-2 grouting material) and 40g particle diameter;
(2) in the mixture of CGM grouting material and aerosil, add 13g water, and stir, form the required thermoinsulation material of repairing for heat distribution pipeline.
(3) the described thermoinsulation material of repairing for heat distribution pipeline is solidified to 72h at normal temperatures, obtain the thermoinsulation material sample S5 after solidifying, this solidified sample is without cracking phenomena.
Embodiment 6
(1) be that 100 order aerosils mix by 60g CGM grouting material (Guangzhou Tuo Da building materials Co., Ltd, CGM-2 grouting material) and 40g particle diameter;
(2) in the mixture of CGM grouting material and aerosil, add 13g water, and stir, form the required thermoinsulation material of repairing for heat distribution pipeline.
(3) the described thermoinsulation material of repairing for heat distribution pipeline is solidified after 24h at normal temperatures, inserted in baking oven, continue to solidify 4h at 50 DEG C, obtain the thermoinsulation material sample S6 after solidifying, this solidified sample is without cracking phenomena.
Embodiment 7
(1) be that 120 order aerosils mix by 70g CGM grouting material (Beijing Newayxun Construction Project Consulting Technology Co., Ltd, CGM270 grouting material) and 30g particle diameter;
(2) in the mixture of CGM grouting material and aerosil, add 15g water, and stir, form the required thermoinsulation material of repairing for heat distribution pipeline.
(3) the described thermoinsulation material of repairing for heat distribution pipeline is solidified after 48h at normal temperatures, inserted in baking oven, continue to solidify 4h at 50 DEG C, obtain the thermoinsulation material sample S7 after solidifying, this solidified sample is without cracking phenomena.
Embodiment 8
(1) be that 120 order aerosils mix by 80g CGM grouting material (Shandong Tuo Da building materials Co., Ltd, CGM290 grouting material) and 20g particle diameter;
(2) in the mixture of CGM grouting material and aerosil, add 20g water, and stir, form the required thermoinsulation material of repairing for heat distribution pipeline.
(3) the described thermoinsulation material of repairing for heat distribution pipeline is solidified after 24h at normal temperatures, inserted in baking oven, continue to solidify 4h at 50 DEG C, obtain the thermoinsulation material sample S8 after solidifying, this solidified sample is without cracking phenomena.
Embodiment 9
(1) be that 130 order aerosils mix by 65g CGM grouting material (Beijing Newayxun Construction Project Consulting Technology Co., Ltd, CGM340 grouting material) and 35g particle diameter;
(2) in the mixture of CGM grouting material and aerosil, add 14g water, and stir, form the required thermoinsulation material of repairing for heat distribution pipeline.
(3) the described thermoinsulation material of repairing for heat distribution pipeline is solidified after 36h at normal temperatures, inserted in baking oven, continue to solidify 6h at 50 DEG C, obtain the thermoinsulation material sample S9 after solidifying, this solidified sample is without cracking phenomena.
Embodiment 10
(1) be that 110 order aerosils mix by 85g CGM grouting material (Guangzhou Tuo Da building materials Co., Ltd, CGM-3 grouting material) and 15g particle diameter;
(2) in the mixture of CGM grouting material and aerosil, add 23g water, and stir, form the required thermoinsulation material of repairing for heat distribution pipeline.
(3) the described thermoinsulation material of repairing for heat distribution pipeline is solidified after 24h at normal temperatures, inserted in baking oven, continue to solidify 2h at 50 DEG C, obtain the thermoinsulation material sample S10 after solidifying, this solidified sample is without cracking phenomena.
Embodiment 11
(1) be that 90 object aerosils mix by 90g CGM grouting material (Shandong Tuo Da building materials Co., Ltd, CGM380 grouting material) and 10g particle diameter;
(2) in the mixture of CGM grouting material and aerosil, add 25g water, and stir, form the required thermoinsulation material of repairing for heat distribution pipeline.
(3) by described for heat distribution pipeline repair thermoinsulation material at 22 DEG C, keep ambient humidity be 53% solidify 96h, obtain solidify after thermoinsulation material sample S11, this solidified sample is without cracking phenomena.
Embodiment 12
A kind of heat distribution pipeline, comprise successively from inside to outside interior delivery pipe, heat insulation layer and plastic casing, heat insulation layer by 50-99 weight portion CGM grouting material and 1-50 weight portion aerosil add water mix after solidify to form, the addition of wherein said water is the 10-30wt% of the total amount of described CGM grouting material and described aerosil.In actual applications, described interior delivery pipe can be the existing known medium transport pipelines such as steel pipe, copper pipe and plastic tube, described plastic casing can be the polyethylene pipe that comprises different brackets, as high density polyethylene (HDPE), it can also be the existing known plastic pipe such as polypropylene, polybutylene tubing.The proportioning of described thermoinsulation material can be the proportioning in embodiment 1-11, can be also other proportion relation, as long as in the scope requiring in the application.
Comparative example 1
In 100gCGM grouting material (Shandong Tuo Da building materials Co., Ltd, CGM270 grouting material), adding 30g water, and stir, solidify after 72h at normal temperatures, obtain the comparative sample D1 after solidifying, there is obvious crack in this solidified sample surface.
Comparative example 2
To 100gCGM grouting material (Beijing Newayxun Construction Project Consulting Technology Co., Ltd, CGM270 grouting material) in add 30g water, and stir, solidify at normal temperatures after 48h, inserted in baking oven, at 50 DEG C, continuing to solidify 4h, obtain the comparative sample D2 after solidifying, there is obvious crack in this solidified sample surface.
Comparative example 3
(1) be that 50 order aerosils mix by 80g CGM grouting material (Shandong Tuo Da building materials Co., Ltd, CGM290 grouting material) and 20g particle diameter;
(2) in the mixture of CGM grouting material and aerosil, add 20g water, and stir, form required for heating pipeline repair materials.
(3) solidify after 24h at normal temperatures for heating pipeline repair materials described, inserted in baking oven, at 50 DEG C, continue to solidify 4h, obtain the comparative sample D3 after solidifying.
Evaluation Example
According to GB/T10295-2008, use thermal conductivity instrument (east, the Five continents, Beijing development in science and technology Co., Ltd, EKO-074-200) to measure the thermal conductivity λ 50 of sample in above-described embodiment and comparative example, its determination data is as shown in table 1.
Table 1 product heat-conducting system determination data
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to mode of execution.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all mode of executions.And the apparent variation of being extended out thus or variation are still among the protection domain in the invention.
Claims (13)
1. a thermoinsulation material of repairing for heat distribution pipeline, is characterized in that, comprises CGM grouting material and aerosil.
2. the thermoinsulation material of repairing for heat distribution pipeline according to claim 1, is characterized in that, comprises 50-99 weight portion CGM grouting material and 1-50 weight portion aerosil.
3. the thermoinsulation material of repairing for heat distribution pipeline according to claim 1 and 2, is characterized in that, also comprise water, the addition of described water is the 10-30wt% of the total amount of described CGM grouting material and described aerosil.
4. the thermoinsulation material of repairing for heat distribution pipeline according to claim 3, is characterized in that, comprises 90-99 weight portion CGM grouting material and 1-10 weight portion aerosil.
5. according to the arbitrary described thermoinsulation material of repairing for heat distribution pipeline of claim 1-4, it is characterized in that, described aerosil is particle diameter 90-150 object aerosil powder.
6. a preparation method for the arbitrary described thermoinsulation material of repairing for heat distribution pipeline of claim 1-5, comprises a certain amount of CGM grouting material and aerosil is mixed.
7. the preparation method of the thermoinsulation material of repairing for heat distribution pipeline according to claim 6, also comprises, in the mixture of CGM grouting material and aerosil, adds a certain amount of water, and the process stirring.
8. an application for the thermoinsulation material of repairing for heat distribution pipeline, is characterized in that, the arbitrary described thermoinsulation material of repairing for heat distribution pipeline of claim 1-7, solidifies at normal temperatures.
9. the application of the thermoinsulation material of repairing for heat distribution pipeline according to claim 8, is characterized in that, the process that the described thermoinsulation material for heat distribution pipeline reparation solidifies at normal temperatures, and maintenance ambient humidity is 50%-55%.
10. the application of the thermoinsulation material of repairing for heat distribution pipeline according to claim 8, is characterized in that, solidifies at normal temperatures after 24-96h, continues to solidify 2-6h at 50 DEG C.
The application of 11. according to Claim 8-10 arbitrary described thermoinsulation materials of repairing for heat distribution pipeline, is characterized in that, in described solidification process, at described thermoinsulation material surface sprinkling water so that described thermoinsulation material is carried out to maintenance.
12. 1 kinds of heat distribution pipelines, is characterized in that, comprise the heat insulation layer being formed by the arbitrary described thermoinsulation material of repairing for heat distribution pipeline of claim 1-5.
13. heat distribution pipelines according to claim 12, is characterized in that, described heat distribution pipeline also comprises interior delivery pipe and plastic casing, and described heat insulation layer is arranged between described interior delivery pipe and described plastic casing.
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| CN201410255364.4A CN104075077A (en) | 2014-06-10 | 2014-06-10 | Heat insulating material for repairing heat pipeline and preparation method and application thereof |
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Citations (5)
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|---|---|---|---|---|
| JPS6182097A (en) * | 1985-04-05 | 1986-04-25 | 前野 昭八郎 | Method of coating curved surface section of pipe piping heat-insulating material layer |
| CN1171094A (en) * | 1994-11-23 | 1998-01-21 | 赫彻斯特股份公司 | Composite material containing aerogel, process for manufacturing said material and use thereof |
| CN101619798A (en) * | 2009-07-10 | 2010-01-06 | 徐州黄山防腐保温工程有限公司 | Direct-embedded heating pipeline insulating layer non-evacuation process, slurry matching and equipment thereof |
| CN202081425U (en) * | 2011-05-24 | 2011-12-21 | 南通市中房建设工程有限公司 | Water-saving mechanism for foundation pit water of building construction |
| CN103711328A (en) * | 2013-12-25 | 2014-04-09 | 华侨大学 | Reinforcing device of concrete beam and construction method thereof |
-
2014
- 2014-06-10 CN CN201410255364.4A patent/CN104075077A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6182097A (en) * | 1985-04-05 | 1986-04-25 | 前野 昭八郎 | Method of coating curved surface section of pipe piping heat-insulating material layer |
| CN1171094A (en) * | 1994-11-23 | 1998-01-21 | 赫彻斯特股份公司 | Composite material containing aerogel, process for manufacturing said material and use thereof |
| CN101619798A (en) * | 2009-07-10 | 2010-01-06 | 徐州黄山防腐保温工程有限公司 | Direct-embedded heating pipeline insulating layer non-evacuation process, slurry matching and equipment thereof |
| CN202081425U (en) * | 2011-05-24 | 2011-12-21 | 南通市中房建设工程有限公司 | Water-saving mechanism for foundation pit water of building construction |
| CN103711328A (en) * | 2013-12-25 | 2014-04-09 | 华侨大学 | Reinforcing device of concrete beam and construction method thereof |
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Application publication date: 20141001 |
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| RJ01 | Rejection of invention patent application after publication |