CN111074717A - Perennial frozen soil area airport runway structure and construction method thereof - Google Patents
Perennial frozen soil area airport runway structure and construction method thereof Download PDFInfo
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- CN111074717A CN111074717A CN202010065136.6A CN202010065136A CN111074717A CN 111074717 A CN111074717 A CN 111074717A CN 202010065136 A CN202010065136 A CN 202010065136A CN 111074717 A CN111074717 A CN 111074717A
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- geocell
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- 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
- E01C9/00—Special pavings; Pavings for special parts of roads or airfields
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- 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
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- 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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
Abstract
The invention discloses an airport runway structure in permafrost regions and a construction method thereof, wherein the runway structure sequentially comprises an epoxy resin concrete wearing layer, a geocell solidified soil layer and a geocell compacted soil layer from top to bottom, and the geocell compacted soil layer is arranged on a permafrost road foundation bed; the geocell solidified soil layer comprises geocells and cement-water glass foamed solidified soil filled in the geocells; the cement-water glass foamed solidified soil is prepared by using soil obtained in situ as a main material, using soil body solidifying agent ordinary portland cement and water glass as secondary materials, using water and foaming agent required by the fluidity and hydration reaction process, and stirring to obtain a curable mixture.
Description
Technical Field
The invention belongs to the paving field, and particularly relates to an airport runway structure in permafrost regions and a construction method thereof.
Background
The perennial frozen soil area in China accounts for about 21.5% of the national soil area, and according to the long-term planning of airport construction in China, airport construction will be continuously carried out in perennial frozen soil areas and part of seasonal frozen soil areas in the future, and dozens of small branches and commuter airports will be continuously added in 2020. In the Heilongjiang province, desert rivers and Gaggendaqi airports have been built, and branch airports such as five connected ponds, remote areas and the like are planned. In Qinghai province, newly-built airports for flower and soil communication and branch airports such as Dereamha, Froulo, Qilian and Qinghai lake are built. Naqu airports are also newly established in Tibet. Most of the airports are located in permafrost areas, and the construction of airport runways cannot avoid the problem of frozen soil engineering.
Summarizing and analyzing the current situation of airport runway building technology in perennial frozen soil areas at home and abroad, the types of the runways mainly comprise: 4 types of bedrock runways, runways built by excavation and replacement methods, runways for laying heat insulation layers and runways for installing heat pipes. In view of the particularity of permafrost regions in China, the foreign runway building experience can only be referred to a certain extent. In China, a plurality of engineering measures for stabilizing the frozen soil foundation are developed in the process of building the railway (highway) in the frozen soil area, but due to the particularity of the runway (wide width, higher flatness requirement, larger airplane load and the like), the construction experience of the railway (highway) cannot be carried to the construction of the runway of the airport.
As materials for airport pavement, asphalt concrete mixture, portland cement concrete, and composite pavement are generally used. And some small frozen soil area airports directly adopt a rough gravel road surface. In permafrost areas, the climate is generally severe, and the common tunnel surface concrete is difficult to meet the requirements of frost resistance and durability of the airport tunnel surface. The root cause of the durability damage of the cold region airport pavement concrete is that the concrete has poor impermeability, and moisture and corrosive media are easy to permeate into the internal pores of the concrete, so that the freezing and thawing resistance and the corrosion resistance of the concrete are deteriorated. By adding the high-efficiency water reducing agent and the air entraining agent into the concrete, the strength and the workability of the prepared concrete can meet the normal design requirement of the airport runway, and the frost resistance grade can reach over F350 (note that the frost resistance grade of the concrete is F350, which means that the concrete can resist not less than 350 times of freeze-thaw cycles without failure).
Runway surfaces constructed from composite materials such as asphalt or asphalt concrete can develop over time a build-up of permanent deformations such as aircraft rutting due to greater aircraft loads relative to vehicle loads, as well as aircraft fuel leakage, air flow impingement, asphalt pavement strength issues and rheology, aircraft load repeat effects and environmental conditions. This phenomenon is particularly evident in airport runways in permafrost areas. How to solve the problem of the pavement diseases needs further research.
Disclosure of Invention
The invention aims to solve the problems and provides an airport runway structure in permafrost regions and a construction method thereof, which have strong freezing resistance, good cracking resistance and small pavement settlement and differential settlement.
In order to realize the purpose, the invention adopts the technical scheme that: an airport runway structure in a permafrost region is sequentially provided with an epoxy resin concrete wearing layer, a geocell solidified soil layer and a geocell compacted soil layer from top to bottom, wherein an epoxy resin bonding layer is arranged between the epoxy resin concrete wearing layer and the geocell solidified soil layer, and the geocell compacted soil layer is arranged on a permafrost road foundation bed; the geocell solidified soil layer comprises geocells and cement-water glass foamed solidified soil filled in the geocells.
Further, the thickness of the epoxy resin concrete wearing layer is 5 cm; and the geocell solidified soil layer and the geocell compacted soil layer are both 20 cm.
Further, the cement-water glass foaming solidified soil comprises the following components in percentage by mass: 60-70 parts of natural soil, 15-30 parts of soil body curing agent, 10-20 parts of water accounting for the total volume of the natural soil and the soil body curing agent and 10-20 parts of foaming agent accounting for the total volume of the mixture; wherein the natural soil is selected from one or more of clay, silty clay, silt, fine sand, medium sand and coarse sand; the soil body curing agent is composed of ordinary portland cement, water glass and an additive auxiliary material, wherein the cement is doped in an amount of 15% of the total mass ratio, and the volume ratio of the cement to the water glass is 1: 0.5; the modulus of the water glass is 2.4-3.4, the concentration of the water glass is determined according to the curing speed required by construction according to tests, and disodium hydrogen phosphate can be used as a retarder if necessary.
Further, the slump of the cement-water glass foamed solidified soil is between 100 and 200 mm.
Further, the additive auxiliary material is at least one of fly ash or sand.
Further, the epoxy resin concrete wearing layer is formed by mixing and solidifying concrete aggregate and epoxy resin cementing material; wherein the epoxy resin cementing material consists of a coloring agent, epoxy resin, a toughening agent, a diluent, water and a curing agent; the colorant adopts inorganic pigment iron oxide red or iron oxide black; the epoxy resin is hydrophilic epoxy resin, and the diluent is water; the curing agent is a polyamide curing agent; the concrete aggregate is a medium-coarse particle size crushed stone aggregate or quartz sand with the compact grading porosity of not more than 6% and the hardness of more than three grades.
Further, the geocell compacted soil layer comprises geocells and clay or graded sand or graded crushed soil filled in the geocells.
A construction method of an airport runway structure in permafrost regions comprises the following steps:
① preparation, A, unloading the natural soil at the runway position by 20cm, transporting the natural soil to a nearby stirring station, and premixing the cement-water glass solidified soil in a fluid state, B, manufacturing a wedge with a diameter of 3-5cm and a length of 40cm, wherein the wedge can be a bamboo wedge, a wood wedge or a steel wedge;
②, hanging nets, wherein A, the earthwork standard room with the height of 20cm, the diaphragm with holes and the aperture of 1cm and the diaphragm welding distance of 25cm is tensioned, so that the standard room is in a tension state and is not allowed to have loose feeling, B, the initial end of the earthwork standard room is laid, the prepared wedge is driven into the roadbed by an iron hammer according to the size of the riveting distance of the earthwork standard room, and the exposed part of the wedge is not higher than the standard room height;
③, filling the stretched geocell from the start end of the geocell along the stretching direction to form a geocell compacted soil layer, wherein the filling height is about 5cm higher than the geocell, filling the geocell until the remaining three layers of geocells are filled, connecting other geocells to fill the geocells again, repeating the steps until the length of the geocell to be laid is reached, and performing smooth rolling on the geocell filling until the specified requirement of compaction degree is met;
④ repeating step ②, pouring the well-tensioned geocell with cement-water glass foamed solidified soil in a premixed flow state from the start end of the geocell along the tensioning direction to form a geocell solidified layer, pouring until the remaining three layers of geocells, troweling along the upper edge of the geocell by using a scraping bar with a vibrator, connecting other geocells for pouring again, and repeating the steps until the length of the geocell to be paved is reached;
The invention has the beneficial effects that:
1. the cement-water glass foaming solidified soil is mainly prepared from locally obtained natural soil, so that the transportation cost of the material is reduced.
2. The cement-water glass foaming solidified soil is added with the foaming agent, so that the gravity of the geocell solidified soil is lower than that of natural soil, and the weight of the roadbed is reduced; the micro bubbles in the cement-water glass foaming solidified soil play roles in heat insulation and heat preservation, and can increase the elasticity and the shock resistance of the geocell solidified soil.
3. Compared with the cement stabilized soil base layer in the prior art, the cement-water glass foamed solidified soil is an elastic semi-rigid structure layer which is heat-insulating, waterproof, large in bending rigidity and strong in impact resistance, has good water stability and freezing stability, and enables a solidified soil roadbed to be capable of abundantly responding to vibration impact of dynamic loads of an airplane due to the three-dimensional stress dispersion effect of geocells in the solidified soil and the existence of uniformly distributed micro bubbles.
4. The pavement structure of the invention adopts a compact graded epoxy resin concrete wearing layer with the void ratio not more than 6 percent, is basically impermeable, has good deformation compatibility with a geocell solidified soil base layer, and compared with the traditional asphalt mixture and cement concrete material, the pavement of the epoxy resin mixture has the advantages of high strength forming speed, higher strength, super-strong frost heaving resistance, long service life, easy colorization, stable performance and the like; in addition, the thickness of the surface layer is only 5.0cm, and compared with the existing design scheme of the pavement surface layer, the manufacturing cost is greatly reduced.
5. The pocket constraint effect of the geocell limits the generation and development of lateral deformation and cracks of the runway base layer caused by frost heaving and dynamic load, the bending rigidity of the base layer can be greatly improved due to the thick plate effect of the geocell, the differential settlement of the runway is reduced, and the safety and the comfort of airplane sliding are improved. The introduction of the foaming agent in the solidified soil can reduce the specific gravity of the solidified soil and enhance the heat preservation and insulation performance of the solidified soil.
6. The premixed fluidized cement-water glass foamed solidified soil can be produced in a mixing plant in a centralized way and poured by a pump truck material distributor; the concrete can be stirred on site, and poured by adopting a mechanical spraying mode, so that the construction is convenient and the construction speed is high. The premixed solidified soil has fluidity, good self-compaction and high solidification speed, so the construction efficiency is high.
Drawings
Fig. 1 is a schematic sectional view of a three-dimensional permafrost region airport pavement structure of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments thereof are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
As shown in fig. 1, the specific structure of the present invention is: an airport runway structure in a permafrost region is sequentially provided with an epoxy resin concrete wearing layer 1, a geocell solidified soil layer 3 and a geocell compacted soil layer 4 from top to bottom, wherein an epoxy resin adhesive layer 2 is arranged between the epoxy resin concrete wearing layer 3 and the geocell solidified soil layer, and the geocell compacted soil layer 4 is arranged on a permafrost roadbed foundation 5; the geocell solidified soil layer 3 comprises geocells and cement-water glass foamed solidified soil filled in the geocells.
Preferably, the thickness of the epoxy resin concrete wearing layer is 5 cm; the geocell solidified soil layer and the geocell compacted soil layer 4 are both 20 mm.
Specifically, the cement-water glass foaming solidified soil filled in the geocell solidified soil layer 3 comprises the following components in percentage by mass: 60-70 parts of natural soil, 15-30 parts of soil body curing agent, 10-20 parts of water accounting for the total volume of the natural soil and the soil body curing agent and 10-20 parts of foaming agent accounting for the total volume of the mixture; wherein the natural soil is selected from one or more of clay, silty clay, silt, fine sand, medium sand and coarse sand; the soil body curing agent is composed of ordinary portland cement, water glass and an additive auxiliary material, wherein the cement is doped in an amount of 15% of the total mass ratio, and the volume ratio of the cement to the water glass is 1: 0.5; the modulus of the water glass is 2.4-3.4, the concentration of the water glass is determined according to the curing speed required by construction according to tests, and disodium hydrogen phosphate can be used as a retarder if necessary.
Preferably, the additive auxiliary material is at least one of fly ash or sand.
Further, the slump of the cement-water glass foamed solidified soil is between 100mm and 200 mm.
The cement-water glass solidified soil has higher strength, better frost heaving stability and higher toughness than cement soil, and under the combined action of the geocell, the cement-water glass solidified soil can bear the repeated action of the load of a pavement airplane and the repeated change of the temperature in a severe cold area without cracking. In addition, due to the addition of the foaming agent, the obtained geocell solidified soil is lower in weight than natural soil, and the weight of the roadbed is reduced. The micro bubbles in the solidified soil play roles of heat insulation and heat preservation, and can increase the elasticity and the shock resistance of the solidified soil of the geocell.
Specifically, the geocell compacted soil layer 4 includes a geocell, and compacted soil is arranged in the geocell, wherein the compacted soil is clay, sand, gravel soil or the like obtained nearby, and the water content of the clay is controlled to be close to the optimal water content.
Preferably, the geocell is a three-dimensional mesh cell formed by welding HDPE textured sheets with the height of 200mm and the welding distance of 200 mm-400 mm.
Specifically, the epoxy resin concrete wearing layer is formed by mixing and solidifying concrete aggregate and epoxy resin cementing material; wherein the epoxy resin cementing material consists of a coloring agent, epoxy resin, a toughening agent, a diluent, water and a curing agent; the colorant adopts inorganic pigment iron oxide red or iron oxide black; the epoxy resin is hydrophilic epoxy resin, and the diluent is water; the curing agent is a polyamide curing agent; the concrete aggregate adopts graded broken stones or sands with hardness greater than three levels; the void ratio of the epoxy resin concrete wearing layer is not more than 6%.
A construction method of an airport runway structure in permafrost regions comprises the following steps:
① preparation, A, unloading the natural soil at the runway position by 20cm, transporting the natural soil to a nearby stirring station, and premixing the cement-water glass solidified soil in a fluid state, B, manufacturing a wedge with a diameter of 3-5cm and a length of 40cm, wherein the wedge can be a bamboo wedge, a wood wedge or a steel wedge;
②, hanging nets, wherein A, the earthwork standard room with the height of 20cm, the diaphragm with holes and the aperture of 1cm and the diaphragm welding distance of 25cm is tensioned, so that the standard room is in a tension state and is not allowed to have loose feeling, B, the initial end of the earthwork standard room is laid, the prepared wedge is driven into the roadbed by an iron hammer according to the size of the riveting distance of the earthwork standard room, and the exposed part of the wedge is not higher than the standard room height;
③, filling the stretched geocell from the start end of the geocell along the stretching direction to form a geocell compacted soil layer 4, wherein the filling height is about 5cm higher than the geocell, filling the geocell until the remaining three layers of geocells are filled, connecting other geocells to fill the geocells again, repeating the steps until the length of the geocell to be laid is reached, and performing smooth rolling on the geocell filling until the specified requirement of compaction degree is met;
④ repeating the step ②, pouring the well-tensioned geocell with cement-water glass foamed solidified soil in a premixed flow state from the initial end of the geocell along the tensioning direction to form a geocell solidified layer 3, pouring until the remaining three layers of geocells are formed, trowelling along the upper edge of the geocell by using a scraping bar with a vibrator, connecting other geocells for pouring again, and repeating the steps until the length of the geocell to be paved is reached;
Claims (8)
1. The airport runway structure in the permafrost region is characterized in that the runway structure sequentially comprises an epoxy resin concrete wearing layer, a geocell solidified soil layer and a geocell compacted soil layer from top to bottom, wherein an epoxy resin adhesive layer is arranged between the epoxy resin concrete wearing layer and the geocell solidified soil layer, and the geocell compacted soil layer is arranged on a permafrost road foundation bed; the geocell solidified soil layer comprises geocells and cement-water glass foamed solidified soil filled in the geocells.
2. The perennial frozen ground area airport runway structure of claim 1, wherein the epoxy concrete wear layer is 5cm thick; and the geocell solidified soil layer and the geocell compacted soil layer are both 20 cm.
3. The perennial frozen ground area airport runway structure of claim 1, wherein the cement-water glass foamed solidified soil comprises the following components by mass: 60-70 parts of natural soil, 15-30 parts of soil body curing agent, 10-20 parts of water accounting for the total volume of the natural soil and the soil body curing agent and 10-20 parts of foaming agent accounting for the total volume of the mixture; wherein the natural soil is selected from one or more of clay, silty clay, silt, fine sand, medium sand and coarse sand; the soil body curing agent is composed of ordinary portland cement, water glass and an additive auxiliary material, wherein the cement is doped in an amount of 15% of the total mass ratio, and the volume ratio of the cement to the water glass is 1: 0.5; the modulus of the water glass is 2.4-3.4.
4. The perennial frozen ground area airport runway structure of claim 3, wherein the slump of the cement-water glass foamed solidified soil is between 100mm and 200 mm.
5. The perennial frozen ground area airport runway structure of claim 3, wherein the additional adjuvant is at least one of fly ash or sand.
6. The perennial frozen ground area airport runway structure of claim 1, wherein the epoxy resin concrete wearing layer is formed by mixing and solidifying concrete aggregate and epoxy resin cementing material; wherein the epoxy resin cementing material consists of a coloring agent, epoxy resin, a toughening agent, a diluent, water and a curing agent; the colorant adopts inorganic pigment iron oxide red or iron oxide black; the epoxy resin is hydrophilic epoxy resin, and the diluent is water; the curing agent is a polyamide curing agent; the concrete aggregate is a medium-coarse particle size crushed stone aggregate or quartz sand with the compact grading porosity of not more than 6% and the hardness of more than three grades.
7. The perennial frozen ground area airport runway structure of claim 1, wherein the geocell compacted earth layer comprises geocells and clay or graded sand, gravel soil filled in the geocells.
8. The method of constructing an airport runway structure in permafrost regions of claim 1, comprising the steps of:
① preparation, A, unloading the natural soil at the runway position by 20cm, transporting the natural soil to a nearby stirring station, and pre-mixing the cement-water glass foamed solidified soil in a flow state, B, manufacturing a wedge with a diameter of 3-5cm and a length of 40cm, wherein the wedge can be a bamboo wedge, a wood wedge or a steel wedge;
②, hanging nets, wherein A, the earthwork standard room with the height of 20cm, the diaphragm with holes and the aperture of 1cm and the diaphragm welding distance of 25cm is tensioned, so that the standard room is in a tension state and is not allowed to have loose feeling, B, the initial end of the earthwork standard room is laid, the prepared wedge is driven into the roadbed by an iron hammer according to the size of the riveting distance of the earthwork standard room, and the exposed part of the wedge is not higher than the standard room height;
③, filling the stretched geocell from the start end of the geocell along the stretching direction to form a geocell compacted soil layer, wherein the filling height is about 5cm higher than the geocell, filling the geocell until the remaining three layers of geocells are filled, connecting other geocells to fill the geocells again, repeating the steps until the length of the geocell to be laid is reached, and performing smooth rolling on the geocell filling until the specified requirement of compaction degree is met;
④ repeating step ②, pouring the well-tensioned geocell with cement-water glass foamed solidified soil in a premixed flow state from the start end of the geocell along the tensioning direction to form a geocell solidified layer, pouring until the remaining three layers of geocells, troweling along the upper edge of the geocell by using a scraping bar with a vibrator, connecting other geocells for pouring again, and repeating the steps until the length of the geocell to be paved is reached;
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112960950A (en) * | 2021-03-01 | 2021-06-15 | 河南省一地建筑科学研究院有限公司 | Ground type heating light backfill material and construction method |
| CN113668542A (en) * | 2021-09-26 | 2021-11-19 | 中水北方勘测设计研究有限责任公司 | Anti-cracking construction method for concrete dam overwintering interlayer in severe cold region |
| CN114716205A (en) * | 2022-03-30 | 2022-07-08 | 中建三局四川建筑装备有限公司 | Production process, application and equipment for producing flow-state self-compacting backfill solidified soil by using solidified material |
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| CN105793492A (en) * | 2013-09-30 | 2016-07-20 | 吉欧泰克科技有限公司 | Pavement systems with geocell and geogrid |
| CN107459301A (en) * | 2017-09-18 | 2017-12-12 | 王继忠 | A kind of premixing fluidised form solidified earth |
| CN212533592U (en) * | 2020-01-20 | 2021-02-12 | 湖南科技学院 | Perennial frozen ground area airport runway structure |
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| CN1936185A (en) * | 2005-09-19 | 2007-03-28 | 王宏韬 | Road foundation |
| CN105793492A (en) * | 2013-09-30 | 2016-07-20 | 吉欧泰克科技有限公司 | Pavement systems with geocell and geogrid |
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| CN212533592U (en) * | 2020-01-20 | 2021-02-12 | 湖南科技学院 | Perennial frozen ground area airport runway structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112960950A (en) * | 2021-03-01 | 2021-06-15 | 河南省一地建筑科学研究院有限公司 | Ground type heating light backfill material and construction method |
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| CN114716205A (en) * | 2022-03-30 | 2022-07-08 | 中建三局四川建筑装备有限公司 | Production process, application and equipment for producing flow-state self-compacting backfill solidified soil by using solidified material |
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