CN102493306B - Construction method of expressway insulating regulation subgrade in permafrost areas - Google Patents
Construction method of expressway insulating regulation subgrade in permafrost areas Download PDFInfo
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- CN102493306B CN102493306B CN2011104488167A CN201110448816A CN102493306B CN 102493306 B CN102493306 B CN 102493306B CN 2011104488167 A CN2011104488167 A CN 2011104488167A CN 201110448816 A CN201110448816 A CN 201110448816A CN 102493306 B CN102493306 B CN 102493306B
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Abstract
The invention relates to a construction method of an expressway insulating regulation subgrade in permafrost areas. The method comprises: impacting and rolling an impact rolled gravel layer with thickness of 50cm in the base at a ground line, or forming a replaced gravel layer with thickness of 50cm through replacement, then filling a gravel layer with thickness of 30cm, excavating the side slope of the replaced gravel layer into a gradient of 1:0.5-1; laying a waterproof geotextile under the replaced gravel layer, at the slope toe of which a drain pipe is disposed; employing layered spreading rolling for earth filling above the gravel layer; and conducting strict levelling at a place of 30cm below a pavement structure layer, and laying an XPS plate thermal insulation layer. The method of the invention can effectively standardize and guarantee the construction quality of an insulating regulation subgrade, reduce heat absorption of an underlying bed in a subgrade body, reduce high subgrade induced highway diseases, reduce thawing of a permafrost subgrade as well as its nonuniform deformation, reduce the influence of climate warming and human engineering activities on permafrost subgrade characteristics, and improves the security and stability of subgrade structures.
Description
Technical field
The present invention relates to a kind of express highway roadbed job practices, be specifically related to a kind of job practices of expressway insulating regulation subgrade in permafrost areas.
Background technology
China's Permafrost Area is built highway and is started from the 1950's, because early stage shortage prevents the understanding of measure to ever-frozen ground and engineering thereof, while running into the ever-frozen ground highway section, become silted up and change the method for disposal processing of filling out by commonly used the digging of general marsh district construction, result causes the ever-frozen ground large tracts of land to expose thawing, has caused later engineering freeze injury hidden danger.1972 to 1985 in order to improve the driving condition of Qinghai-Tibet Highway, and Permafrost Section has been carried out to widening of subgrade and road surface black reconstruction construction.Yet, because dark-coloured pavement has stronger heat-absorbing action, cause pavement temperature significantly to raise, the dark-coloured pavement positive accumulated temperature of soil layer that underlies increases, and Upper Limit of Permafrost moves down, and day by day increase in the High Temperature Permafrost highway section, the highway distress aggravation, cause part roadbed, road surface, bridges and culverts to destroy too early; Simultaneously, because flexible pavement has blocked underlie soil layer and extraneous water, interchange of heat, road surface moisture evaporation heat dissipation is reduced, thereby cause under roadbed that the ever-frozen ground temperature raises, the seasonal thawing degree of depth increases, former natural Near The Upper Limit ground ice melts, finally cause roadbed to produce sedimentation and deformation, the road surface failure, have a strong impact on the normal operation of traffic.Since the nineties in 20th century, roadbed protection ever-frozen ground is raised in local highway section; original road disease obtains to a certain extent and administers; but the ever-frozen ground highway section under the altitude environment condition; the greatest differences of elevated formation level embankment sunny and shady slope heat absorption again and then cause the artificial upper limit of tailo dypass base and descend; and cause the longitudinal crack of tailo dypass base, vertical assymmetrical deformation aggravation of roadbed.
Summary of the invention
The purpose of this invention is to provide a kind of job practices that reduces the expressway insulating regulation subgrade in permafrost areas of roadbed temperature field under the heat absorption of roadbed body, regulation and control speedway wide cut flexible pavement from source, to alleviate " the heat build-up effect " centered by roadbed.
The technical solution adopted in the present invention is:
The job practices of expressway insulating regulation subgrade in permafrost areas is characterized in that:
By following steps, realized:
Step 1: the thick impact-rolling sandy gravel stratum of above-ground route place substrate impact-rolling 50cm or change fill out 50cm thick change the back-up sand gravel bed, fill again the sandy gravel stratum that 30cm is thick, impact-rolling sandy gravel stratum or change back-up sand gravel bed bottom surface 2% unidirectional horizontal wall inscription is set, it is 1:0.5～1 that impact-rolling sandy gravel stratum or the slope excavation that changes the back-up sand gravel bed become the gradient;
Step 2: impact-rolling sandy gravel stratum or change back-up sand gravel bed below and lay one deck water proof geotextiles, impact-rolling sandy gravel stratum or change back-up sand gravel bed toe gutter is set, with drainage system along connecing;
Step 3: banket and take layering decking and rolling mode to carry out in the sandy gravel stratum top, land leveller paves, artificial levelling, and road roller is followed the tracks of and is rolled;
Step 4: the strict leveling in the following 30cm of road surface structare layer place, bonding slope, bend place is straight, lays the XPS plate isolation layer.
In step 1, when the pasture and water marsh is passed through in highway section, one deck plastic-steel geotechnical grid is laid at the sandy gravel stratum top.
In step 1, when steep slope subgrade is passed through in highway section, have a common boundary following 80cm or the following 80cm of road surface structare layer of steep hillslope upper thread and upper side slope digs successively compacting of step to slope and height interval, above-ground route intersection, step excavates from the bottom, the width of step excavation is 2.0m, excavation face 2%～4% horizontal wall inscription that tilts to the inside, fill out and dig the every 1m of intersection and carry out tamping one time, compacting width 8m, dig after step all to fill and change the back-up sand gravel, at step excavation rolling layers four layers of plastic-steel geotechnical grid of continuous laying from top to bottom, digging step changes to be filled to and digs the boundary At The Height, be arranged to 2% unidirectional horizontal wall inscription by changing the packing course end face, lay one deck water proof geotextiles, change on it and fill out and fill the sandy gravel stratum that 50cm is thick.
In step 2, gutter is Φ 25 pvc pipe with holes.
In step 3, when highway section is arranged on shallow cut, cutting section or Steep Slope Embankment section, the road surface structare layer both sides arrange gutter or guardrail.
In step 4, the XPS plate isolation layer forms by XPS plate is combined and spliced, and the length of monolithic XPS plate is that 240cm, width are that 120cm, thickness are 4cm, and four sides of XPS plate arrange boss for overlap joint; The XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to be laid, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay; Place scattered XPS plate in whole laying work area end extension section 5m.
The present invention has the following advantages:
The XPS plate isolation layer that the present invention lays, be arranged at below road surface structare layer, can effectively reduce the heat absorption of roadbed body underlying bed, reduce the highway distress that elevated formation level brings out, reduce the inhomogeneous deformation of subgrade in permafrost soil zone thawing and frozen earth roadbed generation, reduce the impact on the subgrade in permafrost soil zone characteristic of climate warming and artificial engineering activity, improve the safety and stability of road structure, job practices is clear and definite, can be used as the basic skills of the express highway roadbed construction of Permafrost Area.
Accompanying drawing and explanation
Fig. 1 is rich ice, full freezing soil section roadbed processing scheme.
Fig. 2 is rich ice, full ice and contains native ice sheet frozen soil section shallow cut, cutting section processing scheme.
Fig. 3 is rich ice, full ice and contains native ice sheet frozen soil section Steep Slope Embankment or fill out and dig the boundary processing scheme.
Fig. 4 is the XPS plate plan view.
Fig. 5 is the XPS plate elevation.
Fig. 6 is XPS plate overlap joint master drawing.
In figure, 101-road surface structare layer, 102-XPS plate isolation layer, 103-plastic-steel geotechnical grid, 104-sandy gravel stratum, 105-impact-rolling sandy gravel stratum or change the back-up sand gravel bed, 106-water proof geotextiles, 107-gutter, 108-above-ground route;
The 201-road surface structare layer, 202-XPS plate isolation layer, the 203-sandy gravel stratum, 204-water proof geotextiles, the 205-gutter, the 206-gutter, the 207-above-ground route, the 208-dash is twisted with the fingers, the 209-gutter;
The 301-road surface structare layer, 302-XPS plate isolation layer, the 303-sandy gravel stratum, 304-water proof geotextiles, the 305-gutter, the 306-plastic-steel geotechnical grid, 307-changes the back-up sand gravel, the 308-above-ground route, the 309-guardrail, the 310-dash is twisted with the fingers, 311-gutter, 312-gutter.
The specific embodiment
Below in conjunction with the specific embodiment, the present invention will be described in detail.
All complicated heat exchanging process such as radiation, convection current, conduction, turbulent flow are occurring to comprise in earth's surface, although it is various informative to conduct heat, and the process complexity, final result is nothing but earth's surface heat absorption or heat radiation.The engineering disease that the Qinghai-Tibet Highway different times shows and the action effect of Disposal Measures show:
(1) the dark-coloured pavement caloric receptivity increases, and the imbalance of whole subgrade soil heat absorption, heat release is to cause Upper Limit of Permafrost to descend, and roadbed produces the main cause of a series of deformation failures.
(2) adopt in early stage training works and improve the method that roadbed filling height increase thermal resistance is carried out protection of permafrost, be a kind of effective and comparatively economic method under condition of technology and economy at that time.By improving the roadbed height, the roadbed settlement deformation ratio is not renovated highway section and is significantly reduced, yet, the subgrade defect investigation result of carrying out subsequently shows, though through regulation original Damage Types is obtained control to a certain degree, but serious roadbed Problems of Longitudinal Cracks has appearred in the elevated formation level highway section, and adopt the method for increasing embankment to protect the effect of ever-frozen ground different and different with the thermally-stabilised situation of frozen soil self, stable type frozen soil successful, instability mode frozen soil effect is poor, and the roadbed longitudinal crack becomes serious with the increase of depth of fill, particularly after depth of fill is greater than 3m, quantity and the scale in crack all increase considerably.
(3) elevated formation level can cause " Slopes effect " at In Permafrost Regions of Qinghai-xizang Plateau, directly causes frozen earth roadbed lower thaw bowl side-play amount large, and brings out roadbed and the diseases such as Slope Sliding, differential settlement and longitudinal crack occur.
(4) high-grade highway such as speedway is wider due to the road surface physical dimension, and the heat absorption of roadbed body, the heat build-up effect will be more obvious, reduces the heat absorption of roadbed body and keeps that roadbed is thermally-stabilised will become even more important.
(5) in order to regulate the heat absorption of roadbed body, the imbalance of heat release, according to heat transfer theory, adopted in the past the way that improves the roadbed height, reduced the heat flux of importing the Upper Limit of Permafrost place into, increased the boundary face of both sides cold season evaporative heat losses, but the roadbed height is not the more high protection of permafrost that more is conducive to, High Temperature Permafrost district particularly, when the depth of fill of hot weather construction surpasses certain value, will in levee body, form and melt native core and bring out new disease, and roadbed is too high, there are elevated formation level compacting and self stability problem, there is the high slope problem, there is safety problem etc., some highway section, because gradient incline is controlled, increase that Gao De space, road is very little even not to be had, and this has just limited the enforcement that increases the engineering measure of thermal resistance by increasing the roadbed height.
(6) different medium, have different coefficient of thermal conductivity; Same medium, different-thickness, in other conditions, under identical condition, heat flux is also different.At frozen earth roadbed middle overlay XPS plate isolation layer, not only can effective less roadbed body heat absorption but also can reduce theoretical roadbed height, solve well the increase thermal resistance and reduced this contradiction of roadbed height.
The isolation layer roadbed is exactly from the conduction angle; increase embankment in the situation that exceed; overlay one deck heat-barrier material in roadbed; utilize the low heat conductivity of heat-barrier material to stop the top heat to enter the bottom soil body; reduce atmosphere (sun) heat and import a kind of road structure form under roadbed into, it is (within design period) effect of playing protection of permafrost or delaying permafrost degradation within a certain period of time.For highway construction, after overlaying black asphalt pavement, the surface heat give-and-take conditions change, the dark-coloured pavement heat absorption is more, cause that the heat accumulation in roadbed sharply increases, cause Upper Limit of Permafrost to descend, after laying isolation layer, likely compensate this part upper limit and descend, the maintenance Upper Limit of Permafrost is stable, even lifting.The coefficient of thermal conductivity of heat-barrier material is less, and its effect is just better.On soil layer top, take under the temperature boundary condition of the near sinusoidal fluctuation that is the cycle in a year controls, the cyclic fluctuation that the temperature of bottom soil layer also presents with degree of depth amplitude reduces gradually, phase place lags behind gradually changes, therefore the geothermal profile of ever-frozen ground shows as the dynamic changing curve between the envelope that boundary is the highest in each soil depth and minimum temperature forms, and the maximum temperature envelope equals solidification point (being generally 0 ℃) and locates the degree of depth and be the Upper Limit of Permafrost position.When not laying insulation layer, the highest, the minimum temperature envelope is comparatively smooth full curve usually, after laying insulation layer, if extraneous solar radiation, thermal field, the moisture field, and stress field remains unchanged, according to heat-conduction principle, because will causing the insulation layer top and the bottom, the greatest differences (approximately 40 times) of heat-barrier material coefficient of thermal conductivity and subgrade soil coefficient of thermal conductivity forms very large temperature difference, determined thus the reduction of year amplitude of insulation layer bottom soil temperature, it is maximum temperature, scope reduction between the minimum temperature envelope, in this case, maximum temperature envelope and degree of depth axle intersect at the relatively high degree of depth, the upper limit that is ever-frozen ground is elevated, Here it is, and the insulation treatment measures are protected the basic principle of ever-frozen ground.
The job practices of expressway insulating regulation subgrade in permafrost areas of the present invention, realized by following steps:
Step 1: the thick impact-rolling sandy gravel stratum of above-ground route place substrate impact-rolling 50cm, or change and fill out the thick back-up sand gravel bed that changes of 50cm, fill the thick sandy gravel stratum of 30cm again, change and fill out the deck bottom surface 2% unidirectional horizontal wall inscription is set, it is 1:0.5～1 that the slope excavation that changes the back-up sand gravel bed becomes the gradient;
Step 2: change back-up sand gravel bed below and lay one deck water proof geotextiles, change back-up sand gravel bed toe gutter is set, connect with drainage system is suitable;
Step 3: banket and take layering decking and rolling mode to carry out in the sandy gravel stratum top, land leveller paves, artificial levelling, and road roller is followed the tracks of and is rolled;
Step 4: the strict leveling in the following 30cm of road surface structare layer place, bonding slope, bend place is straight, lay the XPS plate isolation layer, the XPS plate isolation layer forms by XPS plate is combined and spliced, the length of monolithic XPS plate is that 240cm, width are that 120cm, thickness are 4cm, and four sides of XPS plate arrange boss for splicing.The XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to be laid, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay.Place scattered XPS plate in whole laying work area end extension section 5m.
Step 5: on the XPS plate isolation layer when filler making and compacting, filler is transported to XPS plate isolation layer one end of laying, guarantee the minimum thickness of deck compacting on it, with the loader filler of having more than needed, nappe forward, the land leveller leveling, road roller rolls, and avoids construction machinery directly to roll the XPS plate isolation layer.After reaching design elevation, the road surface pavement deck.
The XPS plate technical requirements that the XPS plate isolation layer is used is: coefficient of thermal conductivity is not more than 0.03w/m k, and unit weight is not less than 40kg/m
3, compressive strength is not less than 650 KPa.
Embodiment 1: Fu Bing, full freezing soil section, when the roadbed height is less than 2.5m not by the pasture and water marsh, see Fig. 1:
Step 1: 108 times substrates of above-ground route change fill out 50cm change back-up sand gravel bed 105, the slope excavation gradient is 1:1.
Step 2: change back-up sand gravel bed 105 bottom surfaces 2% unidirectional horizontal wall inscription is set, lay water proof geotextiles 106, toe arranges gutter 107, adopts Φ 25 pvc pipe with holes, and gutter 107 connects with drainage system is suitable.
Step 3: fill again the thick sandy gravel stratum 104 of 30cm changing on back-up sand gravel bed 105, sandy gravel stratum 104 end faces are laid one deck plastic-steel geotechnical grid 103, and the above deck of plastic-steel geotechnical grid 103 takes layering decking and rolling mode to carry out, and land leveller paves, artificial levelling, road roller is followed the tracks of and is rolled.
Step 4: the strict leveling in the following 30cm of road surface structare layer 101 place, bonding slope, bend place is straight, lay XPS plate isolation layer 102, XPS plate isolation layer 102 forms by XPS plate is combined and spliced, the length of monolithic XPS plate is that 240cm, width are that 120cm, thickness are 4cm, and four sides of XPS plate arrange boss for splicing.The XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to be laid, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay.Place scattered XPS plate in whole laying work area end extension section 5m.
Step 5: on XPS plate isolation layer 102 when filler making and compacting, filler is transported to an end of the XPS plate isolation layer 102 of laying, guarantee the minimum thickness of deck compacting on it, with the loader filler of having more than needed, nappe forward, the land leveller leveling, road roller rolls, and avoids construction machinery directly to roll XPS plate isolation layer 102.After reaching design elevation, road surface pavement deck 101.
Embodiment 2: Fu Bing, full freezing soil section, when the roadbed height is less than 2.5m by the pasture and water marsh, see Fig. 1:
Step 1: fill thick impact-rolling sandy gravel stratum 105 impact-rollings of 50cm and enter above-ground route 108 times, after the 105 impact-rolling levelings of impact-rolling sandy gravel stratum, fill again the sandy gravel stratum 104 of 30cm on it.
Step 2: lay one deck plastic-steel geotechnical grid 103 at sandy gravel stratum 104 end faces, the above deck of plastic-steel geotechnical grid 103 takes layering decking and rolling mode to carry out, and land leveller paves, artificial levelling, and road roller is followed the tracks of and is rolled.
Step 3: the strict leveling in the following 30cm of road surface structare layer 101 place, bonding slope, bend place is straight, lay XPS plate isolation layer 102, XPS plate isolation layer 102 forms by XPS plate is combined and spliced, the length of monolithic XPS plate is that 240cm, width are that 120cm, thickness are 4cm, and four sides of XPS plate arrange boss for splicing.The XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to be laid, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay.Place scattered XPS plate in whole laying work area end extension section 5m.
Step 4: on XPS plate isolation layer 102 when filler making and compacting, filler is transported to an end of the XPS plate isolation layer 102 of laying, guarantee the minimum thickness of deck compacting on it, with the loader filler of having more than needed, nappe forward, the land leveller leveling, road roller rolls, and avoids construction machinery directly to roll XPS plate isolation layer 102.After reaching design elevation, road surface pavement deck 101.
Embodiment 3: when shallow cut, cutting section are passed through in highway section, see Fig. 2:
Step 1: 207 times substrates of above-ground route are excavated to 201 times 80cm of road surface structare layer, and the slope excavation gradient is 1:0.5, the thick sandy gravel stratum 203 of backfill 50cm.
Step 2: excavation layer bottom surface arranges 2% unidirectional horizontal wall inscription, lays water proof geotextiles 204, and toe arranges gutter 205, adopts Φ 25 pvc pipe with holes, and gutter 205 and drainage system are along connecing.
Step 3: the strict leveling in the following 30cm of road surface structare layer 201 place, bonding slope, bend place is straight, lay XPS plate isolation layer 202, XPS plate isolation layer 202 forms by XPS plate is combined and spliced, the length of monolithic XPS plate is that 240cm, width are that 120cm, thickness are 4cm, and four sides of XPS plate arrange boss for splicing.The XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to be laid, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay.Place scattered XPS plate in whole laying work area end extension section 5m.
Step 4: on XPS plate isolation layer 202 when filler making and compacting, filler is transported to an end of the XPS plate isolation layer 202 of laying, guarantee the minimum thickness of deck compacting on it, with the loader filler of having more than needed, nappe forward, the land leveller leveling, road roller rolls, and avoids construction machinery directly to roll XPS plate isolation layer 202.After reaching design elevation, road surface pavement deck 201.
Step 5: road surface structare layer 201 both sides arrange gutter 206, and the side slope top arranges dash sth. made by twisting 208 and gutter 209.
Embodiment 4: when Steep Slope Embankment is passed through in highway section, see Fig. 3:
Step 1: have a common boundary following 80cm or the following 80cm of road surface structare layer 301 of steep hillslope upper thread and upper side slope digs successively compacting of step to slope and height interval, above-ground route intersection, step excavates from the bottom, the width of step excavation is 2.0m, excavation face 2%～4% horizontal wall inscription that tilts to the inside, fill out and dig the every 1m of intersection and carry out tamping one time, compacting width 8m, all change back-up sand gravel bed 307 after digging step, at step excavation rolling layers four layers of plastic-steel geotechnical grid 306 of continuous laying from top to bottom.
Step 2: dig step and change to be filled to and dig the boundary At The Height, by changing back-up sand gravel 307 end faces, be arranged to 2% unidirectional horizontal wall inscription, lay one deck water proof geotextiles 304, toe arranges gutter 305, adopts Φ 25 pvc pipe with holes, gutter 305 with drainage system along connecing.
Step 3: the slope excavation gradient is 1:0.5, the sandy gravel stratum 303 that backfill 50cm is thick on water proof geotextiles 304.
Step 4: the strict leveling in the following 30cm of road surface structare layer 301 place, bonding slope, bend place is straight, lay XPS plate isolation layer 302, XPS plate isolation layer 302 forms by XPS plate is combined and spliced, the length of monolithic XPS plate is that 240cm, width are that 120cm, thickness are 4cm, and four sides of XPS plate arrange boss for splicing.The XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to be laid, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay.Place scattered XPS plate in whole laying work area end extension section 5m.
Step 5: on XPS plate isolation layer 302 when filler making and compacting, filler is transported to an end of the XPS plate isolation layer 302 of laying, guarantee the minimum thickness of deck compacting on it, with the loader filler of having more than needed, nappe forward, the land leveller leveling, road roller rolls, and avoids construction machinery directly to roll XPS plate isolation layer 302.After reaching design elevation, road surface pavement deck 301.
Step 6: road surface structare layer 301 inboards arrange gutter, and road surface structare layer 301 arranges guardrail 302 near a side on abrupt slope.The side slope top arranges dash sth. made by twisting 310 and gutter 311.
In order to make the isolation layer subgrade construction can reach expected design, should carry out procedure quality control from following link.
(1) heat-barrier material is prepared and is detected:
XPS plate controls index according to designing requirement and structure design is processed, carry out self check before dispatching from the factory, the qualified rear material to every time of self check is all inspected by random samples, and sampling observation is arrived to the advanced pedestrian's work of XPS plate initial survey, first pressing, therefrom choose at random 5 planks, in the sampling of sheet material diverse location, carry out censorship, entrusted the testing agency that the XPS plate detectability is arranged by the owner, complete third party's detection, detect qualified after, can carry out mark to arrival, transport building site to and use.This link will guarantee that XPS plate proterties and quality meet designing requirement.
(2) heat-barrier material transportation and storage
XPS plate belongs to the inflammable chemical materials of lightweight, requires omnidistance Fire Hazard Area, is transported to building site and also will be enclosed bundle to sheet material, guarantees passing material safety.
(3) special confiding a technological secret before the construction
In view of the isolation layer roadbed does not still have feasible construction technique normalizing, the constructor is unfamiliar with work progress and quality control points for attention, material therefor, plant equipment, personnel, make adequate preparation, the intention that clearly designs and construct, can be constructed after special confiding a technological secret for the technician.
(4) construction seasons is selected
Isolation layer roadbed General Requirements arranged construction by the end of June.The construction seasons of laying XPS plate has considerable influence to frozen soil upper limit under embankment, particularly at embankment, lay in latter initial 1～2 year, variation tendency with the artificial upper limit in the way of escape is stable gradually, numerical simulation result shows, until the 6th year construction seasons satisfy the need in the impact of the artificial upper limit just fade away.Therefore the construction seasons of XPS plate roadbed preferably can be chosen in winter, if can't construct winter, should avoid maximum and melt dark season, considers before time that XPS plate lays should be chosen in by the end of June.
(5) construction equipment is prepared
Prepare construction machinery, transportation, handling, leveling, each operation of compacting of guaranteeing to meet material closely are connected, and form continuous processing line.
(6) protecting passway before the construction builds
The Permafrost Area highway network is not also very perfect at present, exist in most of keypoint road project constructions and protect the topic of corresponding, this just requires project management team will carry out in time the publicity of project traffic control and dredge work, be equipped with special personnel, equipment and carry out the logical work of protecting with all strength, guarantee that public vehicles and military vehicle are current smoothly under certain condition, maintain social stability and the normal living material demand of the people.The isolation layer subgrade construction, require to carry out closure construction in whole work progress, and the current isolation layer roadbed that can cause of public vehicles damages.When building the isolation layer roadbed, protect logical work and must carry out in advance.
(7) buried depth is determined
By the setting of the design depth of burying.Control embankment (base) under isolation layer and fill absolute altitude, horizontal wall inscription etc., carry out compacting by construction requirement, leveling.In construction, the strict working lining thickness of controlling, when fill stratum thickness is larger, take the layering decking and rolling, and by designing requirement test record granularity component and water content situation, the employing land leveller paves, artificial levelling, and road roller is followed the tracks of and rolled.The degree of compaction of each compacting aspect of on-the-spot test, check it whether to reach designing requirement, before the laminated solidity reaches standard, must not carry out the next process construction.
(8) flatten compacting under the insulating layer structure layer
The XPS plate used in the isolation layer roadbed is tighter to substructure layer planeness and compaction requirement, and there is " bounce-back " phenomenon in irregular underlayer in the time of can making to construct compacting, can't reach the requirement of isolation layer Subgrade Construction Quality.On plane curve, flatten as far as possible and build this deck, when complete level is had any problem, also to guarantee that (row) insulating board is on the structural plane of same single slope.This deck is built the quality of processing, and directly affects the construction quality of isolation layer roadbed.
(9) lay the XPS plate isolation layer
After underlayer absolute altitude, degree of compaction, planeness reach the control index, by the customization XPS heat-barrier material met the demands, according to the design overlapping mode, to be laid, this link is noted overlap joint and bend processing problem.
Should consider to draft overlapping mode when ordering heat-barrier material, make in advance the overlap joint groove or when constructing, adopt adhesive to glued joint connection by producer, thereby improve workmanship, reduce labour intensity.When laying the two-ply material, every one deck is all carried out to fissure of displacement laying.
The straightway alignment elements is simple, it is relatively easy that sheet material is laid in splicing, the curved section splicing is difficulty relatively, suggestion adopts the method for directly processing to accumulation, concentrated piece to be laid, when piece is processed, the same lumber on-site cutting spelling of irregular sheet material for piece, the original overlapping mode of adjacent sheet metal is interrupted simultaneously, when this place is connected to construction, adopts adhesive to glued joint connection.Laying meets the smooth nature of whole section, and the sheet material embedded squeezing is tight, does not interspace.Meet whole district's section fabric width requirement, widen in right amount in part, bend place, reach the minimum effective width of whole district's section and meet design requirement.
(10) filler and compacting on layer
Consider sheet material self strength problem, construction machinery can not directly roll the XPS insulating board.XPS plate laid check errorless after, with dump truck, the upper strata filler is transported to an end discharging of laying section, by forklift, filler is pushed superfluous filler forward according to reserved compacted depth, the like, complete the making work of filler on sheet material, subsequently with land leveller leveling, road roller compacting.On layer, filler will have adequate thickness just can carry out compacting, and compacted lift should not be too thin, meet the minimum compacted lift thickness that design provides.On layer, degree of compaction meets design requirement.
(11) be connected transition processing
Should provide transitional region by the heat preserving and insulating material section is set to non-thermal insulation section, make this sudden change controlled.Suggestion is unfixed placement XPS plate material in whole laying work area end extension section 5m, for some more sensitive thermal insulation areas, should adopt longer transitional region to reach finer transition transition effect.
Claims (4)
1. the job practices of expressway insulating regulation subgrade in permafrost areas is characterized in that:
By following steps, realized:
Step 1: the thick impact-rolling sandy gravel stratum of above-ground route place substrate impact-rolling 50cm or change fill out 50cm thick change the back-up sand gravel bed, fill again the sandy gravel stratum that 30cm is thick, impact-rolling sandy gravel stratum or change back-up sand gravel bed bottom surface 2% unidirectional horizontal wall inscription is set, it is 1:0.5～1 that impact-rolling sandy gravel stratum or the slope excavation that changes the back-up sand gravel bed become the gradient;
When steep slope subgrade is passed through in highway section, have a common boundary following 80cm or the following 80cm of road surface structare layer of steep hillslope upper thread and upper side slope digs successively compacting of step to slope and height interval, above-ground route intersection, step excavates from the bottom, the width of step excavation is 2.0m, excavation face 2%～4% horizontal wall inscription that tilts to the inside, fill out and dig the every 1m of intersection and carry out tamping one time, compacting width 8m, dig after step all to fill and change the back-up sand gravel, at step excavation rolling layers four layers of plastic-steel geotechnical grid of continuous laying from top to bottom, digging step changes to be filled to and digs the boundary At The Height, be arranged to 2% unidirectional horizontal wall inscription by changing the packing course end face, lay one deck water proof geotextiles, change on it and fill out and fill the sandy gravel stratum that 50cm is thick,
Step 2: impact-rolling sandy gravel stratum or change back-up sand gravel bed below and lay one deck water proof geotextiles, impact-rolling sandy gravel stratum or change back-up sand gravel bed toe gutter is set, with drainage system along connecing;
Step 3: banket and take layering decking and rolling mode to carry out in the sandy gravel stratum top, land leveller paves, artificial levelling, and road roller is followed the tracks of and is rolled;
Step 4: the strict leveling in the following 30cm of road surface structare layer place, bonding slope, bend place is straight, lays the XPS plate isolation layer;
The XPS plate isolation layer forms by XPS plate is combined and spliced, and the length of monolithic XPS plate is that 240cm, width are that 120cm, thickness are 4cm, and four sides of XPS plate arrange boss for overlap joint; The XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to be laid, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay; Place scattered XPS plate in whole laying work area end extension section 5m.
2. the job practices of expressway insulating regulation subgrade in permafrost areas according to claim 1 is characterized in that:
In step 1, when the pasture and water marsh is passed through in highway section, one deck plastic-steel geotechnical grid is laid at the sandy gravel stratum top.
3. the job practices of expressway insulating regulation subgrade in permafrost areas according to claim 1 and 2 is characterized in that:
In step 2, gutter is Φ 25 pvc pipe with holes.
4. the job practices of expressway insulating regulation subgrade in permafrost areas according to claim 3 is characterized in that:
In step 3, when highway section is arranged on shallow cut, cutting section or Steep Slope Embankment section, the road surface structare layer both sides arrange gutter or guardrail.
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| CN104264557B (en) * | 2014-08-28 | 2016-08-24 | 神州建设集团有限公司 | One is partly filled out and is partly dug ecological road structure and construction method |
| CN109811748B (en) * | 2019-01-09 | 2020-10-16 | 东南大学 | Freeway roadbed processing method in frozen soil area |
| CN110777592A (en) * | 2019-11-06 | 2020-02-11 | 中铁第一勘察设计院集团有限公司 | Low embankment ventilation pipe roadbed structure in plateau permafrost region |
| CN112376328B (en) * | 2020-05-28 | 2022-07-22 | 兰州交通大学 | Roadbed freeze injury treatment device with vertical subareas gradually depressurized |
| CN112301805B (en) * | 2020-05-28 | 2022-07-22 | 兰州交通大学 | Roadbed freezing injury treatment device with horizontal bidirectional layered decompression |
| CN113026462B (en) * | 2021-03-22 | 2022-02-01 | 中国科学院西北生态环境资源研究院 | Temperature control structure suitable for road bed and side slope engineering in permafrost region |
| CN115058932B (en) * | 2022-08-04 | 2023-06-23 | 北京市政路桥股份有限公司 | Roadbed for frozen soil road section and construction method thereof |
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