CN114687282B - Bridge pier column snow melting system based on ettringite phase change energy storage - Google Patents
Bridge pier column snow melting system based on ettringite phase change energy storage Download PDFInfo
- Publication number
- CN114687282B CN114687282B CN202210367280.4A CN202210367280A CN114687282B CN 114687282 B CN114687282 B CN 114687282B CN 202210367280 A CN202210367280 A CN 202210367280A CN 114687282 B CN114687282 B CN 114687282B
- Authority
- CN
- China
- Prior art keywords
- bridge pier
- bridge
- energy storage
- ettringite
- snow melting
- 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.)
- Active
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
- E01C11/26—Permanently installed heating or blowing devices ; Mounting thereof
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
- F24S60/10—Arrangements for storing heat collected by solar heat collectors using latent heat
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sustainable Energy (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a bridge pier stud snow melting system based on ettringite phase change energy storage, which comprises an air heater, a water vapor generator, a reactor and a bridge floor buried pipe, wherein the reactor comprises bridge pier studs and reserved holes arranged in the bridge pier studs, and a gas transmission clearance layer is arranged on the outer side wall of each bridge pier stud in a coating manner and has a cavity structure; the air heater and the water vapor generator are respectively communicated with the gas transmission gap layer of the reactor, and the reserved pore passage outlet inside the bridge pier is connected with the buried pipe of the bridge floor; the bridge pier stud is made of a high-alumina cement-based material, and the high-alumina cement-based material contains an ettringite component. The heat energy is stored in the bridge pier columns, and the bridge deck ice and snow melting is realized by utilizing the bridge pier column energy storage and snow melting system. The incoordination of energy supply and demand on time and space is relieved, and the resource utilization efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a bridge pier stud snow melting system based on ettringite phase change energy storage.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
In ice and snow weather, the friction coefficient of the road surface is rapidly reduced due to snow fall and ice, so that the traffic capacity is reduced, and the important hidden danger of traffic safety is also caused. And the road surface is frozen to have short-term irreparability due to air temperature, so that the bridge is very easy to have the problems of freeze thawing, bursting, deformation and the like after being impacted by cold and low-temperature weather, the probability of road traffic jam and traffic accidents is increased, further great negative effects are brought to normal traffic, great potential safety hazards are caused, and even safety accidents and great economic losses can be induced. And rain and snow penetrate into the pavement to cause frost heaving, which seriously affects the service life of the pavement.
The snow melting agent mainly containing chloride has high corrosivity on pavement structures (steel bars, concrete, asphalt and the like), seriously damages the durability of bridge structures, causes potential safety hazards on the structures, and brings great harm to the surrounding environment, existing buildings and green vegetation.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a bridge pier stud snow melting system based on ettringite phase change energy storage. The invention provides a method for realizing reasonable distribution of energy in time and space through an energy storage material, thereby achieving the purposes of saving energy and reducing carbon emission in winter.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a bridge pier column snow melting system based on ettringite phase change energy storage comprises an air heater, a water vapor generator, a reactor and a bridge floor buried pipe, wherein the reactor comprises bridge pier columns and reserved holes arranged in the bridge pier columns, the outer side walls of the bridge pier columns are coated with gas transmission gap layers, and the gas transmission gap layers have cavity structures;
the air heater and the water vapor generator are respectively communicated with the gas transmission gap layer of the reactor, and the reserved pore passage outlet in the bridge pier is connected with the bridge floor buried pipe;
the pier columns of the bridge are made of high-alumina cement-based materials, and the high-alumina cement can be hydrated to generate ettringite.
The invention is transformed into an energy storage bridge pier through the bridge pier, and the structure-function integration is realized.
The bridge pier stud is made of calcium-vanadium stone-based concrete, has good mechanical properties, can play a role in bearing and also has an energy storage function. The heat energy is stored in the bridge pier columns, and the energy storage snow melting system of the bridge pier columns is utilized, so that the problem of energy space-time dependence can be effectively avoided, the defect of intermittent energy is overcome, the energy requirement is matched, the energy utilization efficiency and the environmental protection benefit are higher, and the structure-function integration is realized.
The bridge pier column is combined with an air heater and a water vapor generator, so that heat absorption and heat release are realized. In the process of heat release, the medium is transmitted to the reserved pore channel, and then the medium is transmitted to the bridge deck buried pipe for snow melting.
One or more technical schemes of the invention have the following beneficial effects:
1) The method for preparing the ettringite-based concrete cast pier by adopting the high-alumina cement has good mechanical property, can play a role in bearing and also has an energy storage function.
2) The energy storage material is made of the ettringite-based concrete, so that the cement hydration products are fully utilized, the material cost is reduced, the engineering cost is effectively saved, and the energy storage material is simple in structure, convenient to use, low in production cost and convenient to popularize and use.
3) The energy storage system is constructed by utilizing the structure and the material of the bridge pier stud, the stored energy can be used for peak clipping and valley filling under the condition that accumulated snow exists on a road, the incoordination of energy supply and demand on time and space is relieved, the resource utilization efficiency is improved, and the energy crisis is relieved.
4) The ice and snow melting of the bridge deck is realized, and the accumulated snow on the road surface is avoided, so that the traffic capacity of the road in winter can be improved, and the traffic accidents are reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of a bridge pier snow melting system;
FIG. 2 is an elevation view of a snow melting system for bridge piers;
FIG. 3 is a schematic view of a bridge deck pipe laying of the bridge pier stud snow melting system;
FIG. 4 is a sectional view of a buried pipe of a pier stud of a bridge;
the system comprises a bridge floor 1, a solar air heat collector 2, a reactor 3, a bridge floor buried pipe 4, a heat inlet 5, a heat outlet 6, a reserved pore passage 7, a bridge pier 8, a gas transmission gap layer 9, a damp-proof heat insulation layer 10, a water vapor generator 11 and a water vapor generator.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1 and 2, the bridge pier stud snow melting system based on ettringite phase change energy storage comprises an air heater, a water vapor generator 11, a reactor 3 and a bridge floor buried pipe 4, wherein the reactor comprises a bridge pier stud 8 and a reserved pore 7 arranged inside the bridge pier stud 8, the outer side wall of the bridge pier stud 8 is coated with a gas transmission gap layer 9, and the gas transmission gap layer 9 has a cavity structure;
the air heater and the water vapor generator 11 are respectively communicated with the gas transmission gap layer 9 of the reactor 3, and the reserved pore passage outlet inside the bridge pier column 7 is connected with the bridge deck buried pipe 4;
the bridge pier column 8 is made of a high-alumina cement-based material which contains an ettringite component.
Firstly, the material of the bridge pier column 8 is selected, so that the bridge pier column can be used as an energy storage material. As ettringite is a hydrated salt phase-change material, the phase-change temperature is about 40-50 ℃, the phase-change condition is easy to achieve, and researches prove that the energy storage density of the ettringite is guaranteed, and the characteristics enable the ettringite to become an excellent phase-change energy storage material.
The ettringite can be dehydrated and absorb water to absorb heat and release heat, the ettringite stores energy under the heated condition, and the heat is released when the ettringite is hydrated.
Secondly, in the structure of the bridge pier 8, the outer side wall of the bridge pier 8 is provided with a gas transmission gap layer which is provided with a cavity structure, and the bridge pier is in direct contact with gas in the gas transmission gap layer (a part close to the periphery of the pier can be reserved in the preparation process without pouring high-alumina cement) and is used for receiving heat in the gas (from an air heater) and water vapor in the gas (from a water vapor generator);
meanwhile, the reserved hole 7 in the bridge pier column 8 heats the medium in the reserved hole 7 when the ettringite-based concrete is hydrated, and heat is transmitted out.
And thirdly, the bridge floor embedded pipe 4, wherein the bridge floor embedded pipe 4 can be preset in the bridge floor 1 in practical application, a medium heated in the reserved hole channel enters the bridge floor embedded pipe 4, heat is transferred to the bridge floor through the heat pipe, and the purpose of melting snow and ice on the bridge floor by heating the heat pipe is achieved.
In some embodiments of the invention, the air heater is a solar air collector 2. Collecting solar radiant heat, and heating the medium introduced into the pier. Meanwhile, the solar air heat collector 2 is constructed at the open position of the bridge body or the corresponding support, and the upper part of the solar air heat collector is not shielded, so that solar radiation can be fully absorbed.
In some embodiments of the present invention, as shown in fig. 4, the cross section of the gas transmission interstitial layer 9 is a circular ring structure, and the gas transmission layer 9 is wrapped around the outer sidewall of the bridge pier. The gas transmission gap layer 9 surrounds the bridge pier stud, and is beneficial to uniformly heating the whole bridge pier stud.
As shown in fig. 4, in some embodiments of the present invention, the reserved holes 7 inside the bridge pier 8 are arranged along the vertical axial direction of the bridge pier 8. Furthermore, the number of the reserved hole channels 7 is 1-6. The preformed hole 7 is arranged along the axial direction, and can be fully contacted with pier stud concrete for heat exchange. The arrangement of a plurality of preformed holes 7 can improve the effectiveness of heat exchange.
In some embodiments of the invention, the source of the high alumina cement-based material comprises anhydrite and sulphoaluminate clinker. Further, the molar ratio of the anhydrous gypsum to the sulphoaluminate clinker is 1-3; preferably 2. For example, about 6.31kg of sulphoaluminate cement clinker and 1.69kg of anhydrite are mixed per 8kg of cement mixture.
Ettringite is widely available and is the main hydration product of sulphoaluminate cement. By adjusting the mixing proportion of the sulphoaluminate cement and the gypsum, the content of the ettringite in the hydration product can reach 70-80 g/100g, even higher. Therefore, a large amount of ettringite used for storing energy can be generated by the sulphoaluminate cement. The characteristics of high energy density and low material cost make ettringite an excellent phase change energy storage material.
In some embodiments of the invention, the transport medium of the air heater is air, nitrogen or other inert gas. Nitrogen or other inert gases are conveyed, so that the carbonization reaction of the ettringite-based concrete and CO2 in the air is reduced or avoided, and the carbonization rate of the ettringite is reduced.
In some embodiments of the inventionIn the formula, the conveying medium of the water vapor generator 11 is water vapor. In order to prevent the ettringite from undergoing a dehydration reaction and undergoing a decomposition reaction as shown below, the temperature of hot gas flowing into the pier energy storage system is controlled to be about 70-110 ℃, and the temperature of the hot gas is not required to exceed 110 ℃:3 CaO. Al 2 O 3 ·3CaSO 4 ·32H 2 O→3CaO·Al 2 O 3 ·CaSO 4 ·12H 2 O+2CaSO 4 ·0.5H 2 O+19H 2 O；
3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O→3CaO·Al 2 O 3 ·6H 2 O+3CaSO 4 +26H 2 O。
The pressure of the water vapor in the reactor is controlled to be 8-533 mbar, and the relative humidity is controlled to be below 10%. Within the above control range, the smaller the water vapor pressure and the higher the temperature, the better the energy storage effect. Since ettringite may be decomposed when the temperature is too high, coordination among the temperature, the water vapor pressure and the humidity should be made according to actual conditions.
In some embodiments of the present invention, the transmission medium in the reserved hole 7 and in the deck buried pipe 4 is water or other heat exchange medium. The transmission media in the reserved hole 7 and the bridge deck buried pipe 4 are mainly used for heat exchange and heat transmission, and different heat exchange media can be selected.
In some embodiments of the present invention, the deck burial pipe 4 is made of stainless steel or polyethylene pipe. The stainless steel pipe has the characteristics of large equivalent heat exchange coefficient, good heat conductivity, sensitive surface temperature reaction and weak hysteresis of bridge deck temperature rise.
As shown in fig. 3, in some embodiments of the present invention, the deck burial pipes 4 are formed by connecting heat pipes in series or connecting heat pipes in parallel. The end of the buried pipe of the bridge deck is provided with a heat inlet 5 and a heat outlet 6. Although the parallel system has more welding interfaces between the pipe network and the branch pipeline and more complex construction, the parallel resistance loss of the pipe network is small, the whole system cannot be collapsed due to the blockage of one place, and the resistance loss of the pipeline is smaller than that of the serial system. The heat pipe is laid in the structural layer in an in-line type.
As shown in fig. 4, in some embodiments of the present invention, the gas transmission gap layer 9 further comprises a moisture-proof and heat-insulating layer 10, and the moisture-proof and heat-insulating layer 10 is wrapped and arranged outside the gas transmission gap layer 9. Because the ettringite can react with CO in the air 2 The carbonization reaction takes place as follows:
3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O+3CO 2 →3CaCO 3 +3(CaSO 4 ·2H 2 O)+Al 2 O 3 ·xH 2 O+(26-x)H 2 O。
in order to reduce the carbonization rate of ettringite, ensure the energy storage density, reduce the heat loss of an energy storage system, and facilitate the control of indexes such as the ambient temperature, humidity, air pressure and the like of the pier column energy storage system, a moisture-proof layer and a heat-insulating layer are required to be arranged on the periphery of the pier so as to enclose the energy storage system in a relatively closed environment, allow the controlled air to flow and prevent the humidity exchange with the environment, and play roles of water vapor isolation and heat insulation.
In some embodiments of the invention, the outlet of the deck burial 4 is connected to a reserved hole. And a bidirectional connection is formed, so that heat exchange is facilitated, and the heat exchange medium returns to the reserved hole channel after releasing heat. And a stop valve or an electromagnetic valve is arranged on a pipeline for connecting the bridge floor buried pipe and the reserved hole channel.
In some embodiments of the invention, the outlet of the gas transport void layer 9 is connected to an air heater. The air returns to the air heater after heating the bridge pier stud. And a stop valve or an electromagnetic valve is arranged on the connected pipeline.
In some embodiments of the invention, the air heater and the water vapor generator 11 are respectively connected with the gas transmission gap layer 9 of the reactor through pipelines, and the inlet of the pipeline of the reactor is provided with a temperature sensor and a humidity sensor. Furthermore, a stop valve or an electromagnetic valve is arranged on the pipeline. The temperature sensor and the humidity sensor are used for receiving the parameters of all parts monitored by the temperature sensor and the humidity sensor, analyzing and controlling the wind speed, the humidity and the temperature of the introduced hot air (or hot single stable gas) and the water vapor, and further controlling the energy storage and release stages.
In some embodiments of the invention, the controller is further included, and the controller is in electrical signal connection with the electromagnetic valve, the temperature sensor and the humidity sensor. The controller facilitates monitoring of various parameters and then the overall system can be controlled and operated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a bridge pier stud snow melt system based on ettringite phase transition energy storage which characterized in that: the reactor comprises an air heater, a water vapor generator, a reactor and a bridge floor buried pipe, wherein the reactor comprises bridge piers and reserved channels arranged in the bridge piers, the outer side walls of the bridge piers are coated with gas transmission gap layers, and the gas transmission gap layers have cavity structures;
the air heater and the water vapor generator are respectively communicated with the gas transmission gap layer of the reactor, and the reserved pore passage outlet inside the bridge pier is connected with the buried pipe of the bridge floor;
the cross section of the gas transmission gap layer is of a circular ring structure, and the gas transmission layer is wrapped on the outer side wall of the bridge pier column in a surrounding mode;
the gas transmission gap layer is arranged on the outer side of the gas transmission gap layer in a wrapping mode;
the reserved hole channel in the bridge pier column is arranged along the vertical axial direction of the bridge pier column;
the bridge pier columns are made of high-alumina cement-based materials, and the high-alumina cement-based materials contain ettringite components;
the raw materials of the high-alumina cement-based material comprise anhydrous gypsum and sulphoaluminate clinker;
the molar ratio of the anhydrite to the sulphoaluminate clinker is 2.
2. The ettringite phase change energy storage based bridge pier stud snow melting system of claim 1, wherein: the air heater is a solar air heat collector.
3. The ettringite phase change energy storage based bridge pier stud snow melting system of claim 1, wherein: the conveying medium of the air heater is air or nitrogen.
4. The ettringite phase change energy storage based bridge pier stud snow melting system of claim 1, wherein: the conveying medium of the water vapor generator is water vapor.
5. The ettringite phase change energy storage based bridge pier stud snow melting system of claim 1, wherein: the transmission medium in the reserved hole and the bridge deck buried pipe is water.
6. The ettringite phase change energy storage based bridge pier stud snow melting system of claim 1, wherein: the outlet of the bridge floor buried pipe is connected with the reserved pore channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210367280.4A CN114687282B (en) | 2022-04-08 | 2022-04-08 | Bridge pier column snow melting system based on ettringite phase change energy storage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210367280.4A CN114687282B (en) | 2022-04-08 | 2022-04-08 | Bridge pier column snow melting system based on ettringite phase change energy storage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114687282A CN114687282A (en) | 2022-07-01 |
| CN114687282B true CN114687282B (en) | 2023-04-07 |
Family
ID=82142127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210367280.4A Active CN114687282B (en) | 2022-04-08 | 2022-04-08 | Bridge pier column snow melting system based on ettringite phase change energy storage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114687282B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07316535A (en) * | 1994-05-26 | 1995-12-05 | Mitsubishi Chem Corp | Method for melting snow or preventing freezing by using thermal storage material composition |
| JP4530174B2 (en) * | 2006-05-31 | 2010-08-25 | 鉄建建設株式会社 | Thermal storage system for concrete structures |
| KR100991089B1 (en) * | 2008-04-01 | 2010-10-29 | 조용성 | Pavement heating apparatus using phase change material and pavement heating system having the same |
| CN102718457A (en) * | 2012-07-09 | 2012-10-10 | 中国矿业大学 | Slurry material with cold accumulation and heat resistance function and high water content |
| CN204920992U (en) * | 2015-09-16 | 2015-12-30 | 长安大学 | Frostproofing structure of han qu tunnel design phase change material heat preservation |
| CN105838332A (en) * | 2016-03-31 | 2016-08-10 | 中国民航大学 | Low-temperature phase-change energy-storage material and preparation method thereof |
| CN205856960U (en) * | 2016-07-06 | 2017-01-04 | 中国民航大学 | A kind of based on phase-changing energy storage material and can the airfield pavement structure of snow melt deicing |
| CN208328606U (en) * | 2018-05-08 | 2019-01-04 | 中交二公局第三工程有限公司 | A kind of snow-melting asphalt pavement structure of phase change material structure heating and cooling circulating effect |
-
2022
- 2022-04-08 CN CN202210367280.4A patent/CN114687282B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114687282A (en) | 2022-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100404764C (en) | Thermal insulation flooring | |
| CN102322276A (en) | Tunneling engineering freeze-proofing structure in seasonally frozen ground region | |
| CN111719381A (en) | Ice surface terrace structure | |
| CN108952806A (en) | High and cold tunnel in cold regions water-drainage antifreezing integrated system | |
| CN114687282B (en) | Bridge pier column snow melting system based on ettringite phase change energy storage | |
| CN100523116C (en) | Method for reducing cement base material internal temperature adopting prefilling phase-change material | |
| KR101144890B1 (en) | Freeze protection of fire extinuishing lines in tunnel and anti-icing of road surface using underground heat storage | |
| CN209100089U (en) | High and cold tunnel in cold regions water-drainage antifreezing integrated system | |
| CN205026310U (en) | Steam low energy consumption long distance transportation device | |
| CN202392357U (en) | Directly-buried steam conveying pipeline | |
| CN208917870U (en) | A kind of extremely frigid zones subway station insulation construction | |
| KR20160067609A (en) | Thermal Storage Pipe Filled with Paraffin Phase Change Materials and Temperature Management Method Thereby | |
| CN109354803A (en) | A kind of anti-icing blocking package covers cladding material, casing and its manufacture craft | |
| CN103727359A (en) | Pipeline heat insulation construction method and pipeline heat insulation device of multi-setting foam glass material | |
| CN106089263A (en) | Tunnel based on phase-changing and temperature-regulating gunite concrete anti-freezing and heat-insulating structure and construction method | |
| CN202250107U (en) | Tunneling anti-freezing structure in seasonally frozen ground district | |
| CN105924120A (en) | Waterproof and anti-permeability phase-change-energy-storage gypsum block and preparing method thereof | |
| CN215718947U (en) | Intelligent active heat preservation and drainage system for highway tunnel | |
| CN201162279Y (en) | Inside temperature rise controllable cement based material body | |
| CN201873671U (en) | Methane generating system for sunshine greenhouse | |
| CN210219065U (en) | Novel sun-proof frost resistant compound built on stilts directly-buried thermal insulation pipe of steel is moulded to high strength | |
| CN208418158U (en) | Freeze proof LNG gasification device | |
| CN2781233Y (en) | Greenhouse surface thermal storage device composed by cement precast component | |
| CN106089264A (en) | Tunnel based on phase-changing and temperature-regulating concrete anti-freezing and heat-insulating structure and construction method | |
| CN206428901U (en) | A kind of compound heat insulation house surface of upside-down waterproof layer |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |