CN112983468A - Self-heat-preservation anti-freezing lining structure of traffic tunnel in seasonal frozen soil area - Google Patents
Self-heat-preservation anti-freezing lining structure of traffic tunnel in seasonal frozen soil area Download PDFInfo
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- 238000007710 freezing Methods 0.000 title claims abstract description 29
- 239000002689 soil Substances 0.000 title claims abstract description 24
- 230000001932 seasonal effect Effects 0.000 title claims abstract description 23
- 238000004321 preservation Methods 0.000 title claims abstract description 22
- 239000004964 aerogel Substances 0.000 claims abstract description 72
- 239000004567 concrete Substances 0.000 claims abstract description 56
- 238000009413 insulation Methods 0.000 claims abstract description 38
- 239000002245 particle Substances 0.000 claims abstract description 30
- 238000003756 stirring Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000004568 cement Substances 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 16
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 16
- 229920002239 polyacrylonitrile Polymers 0.000 claims abstract description 15
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 12
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 12
- 239000011435 rock Substances 0.000 claims abstract description 12
- 239000008239 natural water Substances 0.000 claims abstract description 10
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000004965 Silica aerogel Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 18
- 238000010276 construction Methods 0.000 abstract description 14
- 239000012774 insulation material Substances 0.000 abstract description 11
- 238000010257 thawing Methods 0.000 abstract description 2
- 229920002635 polyurethane Polymers 0.000 abstract 1
- 239000004814 polyurethane Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 239000000243 solution Substances 0.000 description 5
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- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000012546 transfer Methods 0.000 description 2
- 108010053481 Antifreeze Proteins Proteins 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
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- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005267 amalgamation Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- 231100000252 nontoxic Toxicity 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
Abstract
The invention belongs to the technical field of cold region tunnel anti-freezing and heat preservation, and discloses a self-heat preservation anti-freezing lining structure of a traffic tunnel in a seasonal frozen soil region, which comprises the following steps: primary support, waterproof layer and secondary lining; the surrounding rock is closely attached to the primary support; the waterproof layer is arranged between the primary support and the secondary lining; the secondary lining is made of aerogel concrete; the aerogel concrete is prepared by mixing and stirring hydrophobic aerogel particles, superfine cement, silica fume, high-strength light fine aggregate, natural water, polyacrylonitrile fiber, a high-efficiency water reducing agent and a defoaming agent. The invention can solve the problems that the heat insulation performance of the heat insulation materials such as polyurethane paved on the cold region tunnel is reduced under the seasonal freeze thawing action, the durability is poor, the field construction process is complex, the safe operation of the cold region tunnel is influenced, and the like.
Description
Technical Field
The invention belongs to the technical field of cold region tunnel anti-freezing and heat preservation, and relates to a self-heat preservation anti-freezing lining structure of a traffic tunnel in a seasonal frozen soil region.
Background
After the tunnel in the seasonal frozen soil area is communicated, a large amount of heat can be taken away due to the flow of cold air in cold seasons, so that a tunnel drainage system is frozen and paralyzed, and the intensity of surrounding rocks is reduced due to the freezing-thawing circulation effect.
At present, the anti-freezing measures of the cold area tunnel mainly comprise: heat supply method, heat preservation and insulation layer method, cold-proof door method and the like. The heat preservation and insulation layer is widely used due to the fact that the engineering investment is small, the applicability is strong, and the heat preservation and insulation requirements are met; the laying method of the heat-insulating material mainly comprises two methods: the first is to lay between the primary support and the secondary lining, as shown in figure 1; the second is between primary and secondary lining surfacing, as shown in figure 2. The traditional heat insulation structure has the following problems that the first heat insulation structure needs special fire prevention and finish treatment on the heat insulation material due to the combustibility of the heat insulation material and the complexity of the construction and installation processes; when the heat-insulating material is covered on the surface of the lining, the defects such as cracking of the lining are difficult to find and cannot be timely treated. The flammability of the second heat-insulating layer material ensures that the fire is easily caused when the secondary lining steel bar is welded; the constructed heat insulation material is easy to fall off when the secondary lining is vibrated; the heat insulation layer is not easy to maintain and treat after being damaged and failed in the tunnel structure; the heat insulation material is arranged between the primary support and the secondary lining, and the heat insulation material is easy to absorb water and deform due to the existence of load and water, so that the heat insulation effect is poor, and even the heat insulation material is damaged and loses efficacy. And the two lining structures are paved with heat-insulating layers, the tunnel excavation section is enlarged, and one construction procedure is added, so that the construction time is prolonged.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a self-insulation anti-freezing lining structure of a traffic tunnel in a seasonal frozen soil area. The technical scheme is as follows:
the utility model provides a frostproofing lining cutting structure of seasonal frozen soil district traffic tunnel self preservation temperature, includes: primary support, waterproof layer and secondary lining; primary support of the surrounding rocks by close contact; a waterproof layer is arranged between the primary support and the secondary lining; the secondary lining is made of aerogel concrete;
the aerogel concrete is prepared by mixing and stirring hydrophobic aerogel particles, superfine cement, silica fume, high-strength light fine aggregate, natural water, polyacrylonitrile fiber, a high-efficiency water reducing agent and a defoaming agent.
Further, the preparation process of the aerogel concrete comprises the following steps: firstly, adding a high-efficiency water reducing agent and a defoaming agent into natural water, uniformly mixing to obtain a mixed liquid, and then manually and uniformly mixing superfine cement, high-strength light fine aggregate, silica fume, aerogel particles and polyacrylonitrile fibers to form a mixed dry material; and finally, adding the mixed liquid into the prepared uniformly mixed dry material twice, manually stirring when adding the mixed liquid for the first time to wet the dry material and prevent aerogel from flying, and stirring when adding the mixed liquid for the second time by using a stirrer, wherein the stirring speed is preferably slow first and then fast.
Further, the aerogel particles are silica aerogel particles, and the particle size of the aerogel particles is within 5 mm.
Further, the mixing amount of the silica fume is not more than 10% of the mass of the superfine cement.
Furthermore, the volume of the superfine cement paste is more than 40%, and the volume of the aerogel particles is less than 60%.
Further, the polyacrylonitrile fiberThe mixing amount is 1.5kg/m3。
Further, the heat conductivity coefficient of the aerogel concrete is calculated according to the thickness equivalent thermal resistance of the secondary lining.
Further, the thermal conductivity of the aerogel concrete is not more than 0.15W/(m.K), and the thickness of the aerogel concrete is 40-60 cm.
The technical scheme provided by the implementation of the invention has the following beneficial effects:
1. according to the self-insulation anti-freezing lining structure for the traffic tunnel in the seasonal frozen soil area, disclosed by the invention, the lower heat conductivity coefficient of aerogel concrete enables the poured secondary lining to serve as a bearing structure and have certain heat insulation performance. Equivalently, the traditional anti-freezing heat-insulating structure is simplified into a layer of aerogel concrete secondary lining from the original bearing protective structure (secondary lining) and heat-insulating structure (heat-insulating layer). The design of the whole tunnel anti-freezing lining structure is simpler, the construction is more convenient, the construction cost is reduced, and the construction efficiency is improved.
2. According to the self-insulation anti-freezing lining structure for the traffic tunnel in the seasonal frozen soil area, the traditional structure of the heat insulation layer and the secondary lining is replaced by the secondary lining made of aerogel concrete, so that one construction process is reduced, the construction is convenient, the construction time is saved, and the construction efficiency is improved. The tradition is laid the heat preservation and need set up the skeleton and go up every piece amalgamation of insulation material, and aerogel concrete has easy plasticity, and the insulation construction integrality of constituteing is better, does not also have the shortcoming that insulation material drops easily among the tradition anti-freeze structure, consequently has better integrality, and the heat preservation effect is better.
3. The self-insulation anti-freezing lining structure for the traffic tunnel in the seasonal frozen soil area, disclosed by the invention, has the advantages that the condition of the tunnel lining can be visually observed due to no laying of traditional heat insulation materials, and the maintenance and the repair are convenient.
4. The aerogel concrete adopted by the self-insulation anti-freezing lining structure of the traffic tunnel in the seasonal frozen soil area disclosed by the invention is a grade-A non-combustible material, is non-toxic and pollution-free, has higher safety, and has good heat insulation performance and good workability; and the heat preservation material that traditional lining cutting structure adopted is flammable can emit toxic gas, and lays the heat preservation and can increase the tunnel excavation area, increases the material and uses, and construction cost is high.
5. According to the self-insulation anti-freezing lining structure for the traffic tunnel in the seasonal frozen soil area, disclosed by the invention, the defects of ash flying and floating of aerogel in the stirring process can be overcome by mutual coordination of all the formulas in the aerogel concrete, and the construction materials are saved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a cross-sectional view of a conventional tunnel antifreeze lining structure with a thermal insulation layer directly laid on the surface of a secondary lining;
FIG. 2 is a cross sectional view of a tunnel anti-freezing lining structure with a heat insulation layer laid between a traditional primary support and a secondary lining and on the surface of the secondary lining;
FIG. 3 is a cross sectional view of the self-insulation anti-freezing lining structure of the traffic tunnel in the seasonal frozen soil region;
fig. 4 is a flow chart of preparation of aerogel concrete in the self-insulation anti-freezing lining structure of the traffic tunnel in the seasonal frozen soil region.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
The main heat preservation and insulation material methods in the current cold region tunnel antifreezing measures mainly comprise two methods: the first method is to lay a heat insulation layer on the surface of the secondary lining as shown in figure 1; the second method is to lay heat-insulating layers between the primary support and the secondary lining and on the surface of the secondary lining as shown in figure 2.
The self-insulation anti-freezing lining structure of the traffic tunnel in the seasonal frozen soil area is laid on the surface of a surrounding rock 1 of the tunnel in the cold area and consists of a waterproof layer 3 of a primary tunnel support 2 and aerogel concrete 4 as shown in figure 3. The anti-freezing lining structure is sequentially provided with an aerogel concrete 4 waterproof layer 3 and a primary support 2 from the inside to the inside of a hole. The primary support 2 is conventional sprayed concrete, and the aerogel concrete 4 is a secondary lining poured by aerogel concrete doped with polyacrylonitrile fibers, and is used for sharing a part of load and simultaneously preventing cold air in the tunnel from freezing to the inside of the surrounding rock of the tunnel so as to prevent the drain pipe from being frozen and blocked.
The aerogel concrete 4 has the bearing capacity of common concrete and also has certain heat preservation and heat insulation performance as the traditional heat preservation material. The structure working principle is as follows: when the tunnel is communicated, in cold seasons, because the temperature of the surrounding rock is higher than the temperature of air in the tunnel, heat is transferred from high to low, meanwhile, the air flow in the tunnel accelerates the convective heat transfer of the surrounding rock, the lining and the air in the tunnel, most of the heat is taken away, so that the underground water behind the lining is frozen, and a drainage system cannot normally drain water. The heat conductivity coefficient of the aerogel concrete is much smaller than that of common concrete, so that cold air in a hole can be prevented from freezing to surrounding rocks, and the surrounding rocks behind the lining are in a normal temperature state as shown in a formula (1).
Φ＝-λAgradt (1)
In equation (1): phi is the heat flow through a certain section; λ is the thermal conductivity of the material; gradt is the temperature gradient.
The preparation of the aerogel concrete can be realized by the following technical scheme:
the aerogel concrete is uniformly distributed concrete which is obtained by stirring hydrophobic aerogel particles, superfine cement, silica fume, high-strength light fine aggregate, natural water, polyacrylonitrile fiber, a high-efficiency water reducing agent and a defoaming agent according to a certain proportion. The production steps comprise:
the method comprises the following steps: adding a high-efficiency water reducing agent and a defoaming agent into part of natural water for uniform mixing, and then manually and uniformly mixing superfine cement, high-strength light fine aggregate, silica fume, hydrophobic aerogel particles and polyacrylonitrile fibers to form a mixed dry material, wherein the aerogel particles are silica aerogel particles, and the doping amount of the silica fume is not more than 10% of the mass of the superfine cement.
Step two: and (3) adding part of the natural water into the uniformly mixed dry material prepared in the step one, manually stirring, then pouring the rest water into the material, and uniformly stirring by using a stirrer, wherein the stirring speed is slow firstly and then is fast.
The silica aerogel has incomparable heat preservation and insulation effects compared with other materials, is called as a super heat preservation material, and silica concrete obtained by doping the silica aerogel into concrete can greatly reduce the heat conductivity coefficient of the silica concrete, so that the silica concrete has good heat preservation and insulation properties. The polyacrylonitrile fiber can enhance the mechanical property of the aerogel concrete and further reduce the heat conductivity coefficient of the concrete. The workability of the concrete is enhanced by adding the high-efficiency water reducing agent, and the defoaming agent is added to avoid generating large bubbles in the stirring process to generate disadvantages on the mechanical property of the concrete. The preparation process of the aerogel concrete can reduce ash flying and floating of the aerogel and greatly improve the thermal insulation performance of the aerogel concrete; the structure can improve the construction efficiency of the cold region tunnel, reduce the cost and facilitate the maintenance.
Furthermore, in the stirring process, in order to prevent the pore structure of the aerogel particles from collapsing and losing the original characteristics, hydrophobic aerogel particles are adopted, and the particle diameter of the hydrophobic aerogel particles is within 5 mm.
Further, in order to ensure the workability of concrete and prevent aerogel particles from floating upwards, the mixing amount of the high-efficiency water reducing agent and the defoaming agent in the step one is determined according to the actual effect. The mixing amount of the silica fume is not more than 10 percent of the mass of the superfine cement.
Furthermore, in order to ensure the strength and the heat insulation performance of the concrete, in the step one, the volume ratio of the superfine cement paste is more than 40 percent, the volume ratio of the aerogel particles is less than 60 percent, and the mixing amount of the polyacrylonitrile fibers is 1.5kg/m3。
Furthermore, in order to prevent the ultrafine cement, the silica fume and the aerogel particles from flying in the stirring process, the concrete is prepared by firstly adding a part of natural water to perform manual premixing and then putting the natural water into a stirrer to perform slow stirring and then rapid stirring.
The embodiment takes a tunnel of a ridge mountain as an example. In cold seasons, air in the tunnel flows, the temperature of the air in the tunnel is lower than that of a rock stratum, the surrounding rock behind the lining can release heat into the tunnel under forced convection heat transfer, the aerogel concrete structure has a certain heat insulation effect, the temperature of a drainage system behind the lining can be above 0 ℃, and water can be normally discharged. The tunnel length of the ridge-pulling mountain is 5530m, the extreme maximum temperature is 28.7 ℃, the extreme minimum temperature is-37 ℃, the maximum frozen soil depth of the tunnel inlet is 1.60m, the thickness of C45 waterproof reinforced concrete at the tunnel inlet and outlet is 55cm at 500m, and 10cm of phenolic aldehyde heat-insulating material is paved on the surface of the secondary lining. If the aerogel concrete with equal lining thickness is used for replacing the original designed heat-insulating layer and the secondary lining, the heat conductivity coefficient of the aerogel concrete is not more than that of the original combined structure, namely not more than 0.15W/(m.K).
In equation (2): raThermal resistance of aerogel concrete; deltaaIs the aerogel concrete thickness; a is the circumferential area of the tunnel; lambda [ alpha ]aIs the aerogel concrete thermal conductivity coefficient; delta1Is the thickness of the second liner; lambda [ alpha ]1Taking the thermal conductivity of the two liners as 2.56W/(m.K); delta2The thickness of the heat preservation layer; lambda [ alpha ]2The heat conductivity coefficient of the heat-insulating layer is 0.03W/(m.K).
The preparation method of the aerogel concrete comprises the following raw materials: superfine cement, high-strength light fine aggregate, a high-efficiency water reducing agent, a defoaming agent, silica fume, polyacrylonitrile fiber, water and aerogel particles. The production steps comprise:
the method comprises the following steps: and uniformly mixing water and additives (a high-efficiency water reducing agent and a defoaming agent) to obtain a mixed liquid, wherein the mixing amount of the additives is determined according to the actual effect. And uniformly mixing the aerogel, the superfine cement, the silica fume, the high-strength light fine aggregate and the polypropylene fiber to obtain the mixed aggregate. The volume ratio of the cement paste is more than 40 percent, the volume ratio of the aerogel particles is less than 60 percent, and the mixing amount of the polyacrylonitrile fiber is 1.5kg/m3The mixing amount of the silica fume is not more than 10 percent of the mass of the cement。
Step two: and (4) adding part of the mixed solution obtained in the step one into the mixed aggregate for manual premixing to prevent dry materials from flying. And then performing machine stirring, pouring the mixed solution into the mixed aggregate while stirring, slowly stirring for 8min, and then quickly stirring for 1 min. The stirring mode can reduce ash flying of various light materials to a great extent, prevent aerogel particles from being broken, and simultaneously, the obtained concrete is uniformly mixed and has good workability.
According to the invention, the fiber aerogel concrete is produced by the defoaming agent, the superfine cement, the high-strength light fine aggregate, the high-efficiency water reducing agent, the water, the silica fume and the polyacrylonitrile fiber, the new material of aerogel is introduced, the ash flying of the material is reduced by a reasonable stirring mode, the uniform mixing of aerogel particles is ensured, and the formed aerogel concrete can improve the heat insulation performance of common concrete.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (8)
1. The utility model provides a frostproofing lining structure of season frozen soil district traffic tunnel self preservation temperature which characterized in that includes: primary support, waterproof layer and secondary lining; the surrounding rock is closely attached to the primary support; the waterproof layer is arranged between the primary support and the secondary lining; the secondary lining is made of aerogel concrete;
the aerogel concrete is prepared by mixing and stirring hydrophobic aerogel particles, superfine cement, silica fume, high-strength light fine aggregate, natural water, polyacrylonitrile fiber, a high-efficiency water reducing agent and a defoaming agent.
2. The self-insulation anti-freezing lining structure of the traffic tunnel in the seasonal frozen soil area as claimed in claim 1, wherein the preparation process of the aerogel concrete comprises the following steps:
firstly, adding a high-efficiency water reducing agent and a defoaming agent into natural water, uniformly mixing to obtain a mixed liquid, and then manually and uniformly mixing superfine cement, high-strength light fine aggregate, silica fume, aerogel particles and polyacrylonitrile fibers to form a mixed dry material; at last in adding the homogeneous mixing drier that makes twice with mixing liquid, carry out manual stirring when adding mixing liquid for the first time, moist drier prevents that aerogel ash from flying, through the mixer mix when adding mixing liquid for the second time, should be slow earlier afterwards fast in order to reduce the broken stirring speed of aerogel.
3. The self-insulation anti-freezing lining structure of the traffic tunnel in the seasonal frozen soil area as claimed in claim 1, wherein the aerogel particles are silica aerogel particles, and the particle size of the aerogel particles is within 5 mm.
4. The self-insulation anti-freezing lining structure of the traffic tunnel in the seasonal frozen soil area as claimed in claim 1, wherein the amount of silica fume is not more than 10% of the mass of the superfine cement.
5. The self-insulation anti-freezing lining structure of the traffic tunnel in the seasonal frozen soil area as claimed in claim 1, wherein the volume of the ultrafine cement paste is more than 40%, and the volume of the aerogel particles is less than 60%.
6. The self-insulation anti-freezing lining structure of traffic tunnels in seasonal frozen soil areas according to claim 1, wherein the amount of polyacrylonitrile fibers is 1.5kg/m3。
7. The self-insulation anti-freezing lining structure of the traffic tunnel in the seasonal frozen soil area as claimed in claim 1, wherein the thermal conductivity of the aerogel concrete is calculated according to the thickness equivalent thermal resistance of the secondary lining.
8. The self-insulation anti-freezing lining structure of the traffic tunnel in the seasonal frozen soil area as claimed in claim 1, wherein the thermal conductivity of the aerogel concrete is not more than 0.15W/(m-K), and the thickness of the aerogel concrete is 40-60 cm.
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