CN102493306A - 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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- CN102493306A CN102493306A CN2011104488167A CN201110448816A CN102493306A CN 102493306 A CN102493306 A CN 102493306A CN 2011104488167 A CN2011104488167 A CN 2011104488167A CN 201110448816 A CN201110448816 A CN 201110448816A CN 102493306 A CN102493306 A CN 102493306A
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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 the job practices of the heat insulation regulation and control roadbed of a kind of Permafrost Area speedway.
Background technology
China builds highway in the ever-frozen ground district and starts from the 1950's; Because early stage shortage prevents the understanding of measure to ever-frozen ground and engineering thereof; When running into the ever-frozen ground highway section; The method of disposal processing of filling out is changed in the silt of digging by the construction of location, general marsh is commonly used, and the result causes the exposure of ever-frozen ground large tracts of land to melt, and has caused later engineering freeze injury hidden danger.In order to improve the driving condition of Qinghai-Tibet Highway Permafrost Section was carried out widening of subgrade and road surface black reconstruction construction in 1972 to 1985.Yet,, cause pavement temperature to raise significantly because dark-coloured pavement has stronger heat-absorbing action; The dark-coloured pavement positive accumulated temperature of soil layer that underlies increases, and the ever-frozen ground upper limit moves down, and day by day increase in high temperature frozen soil highway section; The highway distress aggravation causes part roadbed, road surface, bridges and culverts results in premature failure; Simultaneously; Owing to flexible pavement has blocked underlie soil layer and extraneous water, interchange of heat, road surface water evaporates heat dissipation is reduced, thereby cause that the ever-frozen ground temperature raises under the roadbed, thaw depth increase in season; Ground ice melts near the former natural upper limit; Cause roadbed to produce sedimentation and deformation at last, the road surface is destroyed, and has a strong impact on the normal operation of traffic.Roadbed protection ever-frozen ground is raised in local highway section since the nineties in 20th century; Original road disease is to a certain degree administered; But the ever-frozen ground highway section under the altitude environment condition; The greatest differences of the domatic heat absorption of elevated formation level embankment negative and positive again and then cause the artificial upper limit of tailo dypass base and descend and causes 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 heat insulation regulation and control roadbed of Permafrost Area speedway of roadbed temperature field under the heat absorption of roadbed body, the regulation and control speedway wide cut flexible pavement from the source, is " the heat build-up effect " at center to alleviate with the roadbed.
The technical scheme that the present invention adopted is:
The job practices of the heat insulation regulation and control roadbed of Permafrost Area speedway is characterized in that:
Realize by following steps:
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 the thick sandy gravel stratum of 30cm again; 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 XPS plate isolation layer.
In the step 1, when the pasture and water marsh was passed through in the highway section, one deck plastic-steel geotechnical grid was laid at the sandy gravel stratum top.
In the step 1, when the abrupt slope roadbed was passed through in the highway section, steep hillslope upper thread and the last side slope following 80cm in boundary or the following 80cm of road surface structare layer were to step compacting is successively dug in side slope and height interval, above-ground route intersection down; Step excavates from the bottom, and the width of excavation step is 2.0m, and excavation is towards interior tilt 2%～4% horizontal wall inscription; Fill out and dig the every 1m of intersection and carry out tamping one time; Compacting width 8m digs all to fill behind the step and changes the back-up sand gravel, at excavation step rolling layers four layers of plastic-steel geotechnical grid of continuous laying from top to bottom; Digging step changes and is filled to that digging has a common boundary highly locates; Be arranged to 2% unidirectional horizontal wall inscription with changing the packing course end face, lay one deck water proof geotextiles, change on it and fill out and fill the thick sandy gravel stratum of 50cm.
In the step 2, gutter is Φ 25 pvc pipes with holes.
In the step 3, when the highway section was arranged on shallow cut, cutting section or abrupt slope embankment section, the road surface structare layer both sides were provided with gutter or guardrail.
In the step 4, XPS plate isolation layer forms by the 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 are provided with boss and are used for overlap joint; XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to lay, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay; Outside whole laying work area end, place scattered XPS plate in the 5m of extension.
The present invention has the following advantages:
The XPS plate isolation layer that the present invention lays is arranged at below the 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 climate warming and of the influence of artificial engineering activity, improve the safety and the stability of road structure the subgrade in permafrost soil zone characteristic; 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 for rich ice, full ice and contain native ice sheet frozen soil section shallow cut, cutting section processing scheme.
Fig. 3 is for rich ice, full ice and contain native ice sheet frozen soil section abrupt slope embankment or fill out and dig the boundary processing scheme.
Fig. 4 is XPS board plane figure.
Fig. 5 is an XPS plate elevation.
Fig. 6 is XPS plate overlap joint master drawing.
Among the 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, 306-plastic-steel geotechnical grid, 307-change 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.
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The specific embodiment
Below in conjunction with the specific embodiment the present invention is carried out detailed explanation.
All complicated heat exchanging process such as radiation, convection current, conduction, turbulent flow are taking place to comprise in the face of land, although it is various informative to conduct heat, process is complicated, and final result is nothing but face of land heat absorption or heat radiation.The engineering disease that the Qinghai-Tibet Highway different times is showed 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 the ever-frozen ground upper limit to descend, and roadbed produces the main cause of a series of deformation failures.
(2) adopting the raising roadbed depth of fill to increase the method that thermal resistance is protected frozen soil in the early stage training works, is a kind of effective and comparatively economic method under condition of technology and economy at that time.Through improving the roadbed height, the roadbed settlement deformation ratio is not renovated the highway section and is significantly reduced, yet; The subgrade defect investigation result of carrying out subsequently shows that though make original disease type obtain control to a certain degree through regulation, serious roadbed longitudinal crack problem 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 effect is obvious, and instability mode frozen soil effect is relatively poor, and the roadbed longitudinal crack becomes serious with the increase of depth of fill; Particularly after depth of fill was greater than 3m, the quantity and the scale in crack all increased considerably.
(3) elevated formation level can cause " negative and positive slope effect " in Qinghai-Tibet ever-frozen ground district, causes directly that frozen earth roadbed the thaw bowl side-play amount is big down, and brings out roadbed and diseases such as Slope Sliding, differential settlement and longitudinal crack occur.
(4) high-grade highway such as speedway is because road surface physical dimension broad, 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 to become even more important.
(5),, adopted the way that improves the roadbed height in the past according to heat transfer theory in order to regulate the imbalance of the heat absorption of roadbed body, heat release; Reduced the heat flux of importing ever-frozen ground upper limit place into, increased the boundary face of both sides cold season evaporative heat losses, but the roadbed height is not the high more frozen soil that helps more protecting; High temperature permafrost region particularly when the depth of fill of hot weather construction surpasses certain value, will form in levee body and melt soil and examine and bring out new disease; And roadbed is too high; There are elevated formation level compacting and self stability problem, have the high slope problem, have safety problem etc.; Some highway section, because gradient incline control, it is very little even do not have to increase high space, road, this has just limited through increasing the enforcement that the roadbed height increases the engineering measure of thermal resistance.
(6) different medium has different coefficient of thermal conductivity; Same medium, different-thickness, under the identical condition of other conditions, heat flux is also different.In frozen earth roadbed, overlay XPS plate isolation layer, not only can effective less roadbed body heat absorption but also can reduce theoretical roadbed height, solve the increase thermal resistance well and reduced this contradiction of roadbed height.
The isolation layer roadbed is exactly from the conduction angle; Exceeding under the situation of increasing embankment; In roadbed, overlay one deck heat-barrier material; Utilize the low heat conductivity of heat-barrier material to stop the top heat to get into the bottom soil body, reduce atmosphere (sun) heat and import a kind of road structure form roadbed under into, its within a certain period of time (in design period) play the effect of protecting frozen soil or delaying permafrost degradation.For highway construction, behind the overlay dark asphalt road surface, the surface heat give-and-take conditions change; The dark-coloured pavement heat absorption is more; Cause that the heat accumulation in the roadbed sharply increases, cause the ever-frozen ground upper limit to descend, after laying isolation layer; Then might compensate this part upper limit and descend, keep the stable even lifting of the ever-frozen ground upper limit.The coefficient of thermal conductivity of heat-barrier material is more little, and its effect is just good more.Be under the temperature boundary condition control of near sinusoidal fluctuation in cycle on soil layer top with 1 year; The cyclic fluctuation that the temperature of bottom soil layer also demonstrates 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 the 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 ever-frozen ground upper limit position.When not laying insulation layer; The highest, minimum temperature envelope is comparatively smooth full curve usually, after laying insulation layer, if extraneous solar radiation, thermal field, moisture field and stress field remain unchanged; According to heat-conduction principle; Because the greatest differences (about 40 times) of heat-barrier material coefficient of thermal conductivity and subgrade soil coefficient of thermal conductivity will cause the insulation layer top and the bottom to form very big temperature difference, determined the reduction of year amplitude of insulation layer bottom soil body temperature thus, i.e. the reduction of scope between maximum temperature, the minimum temperature envelope; In this case; Maximum temperature envelope and degree of depth axle intersect at the higher relatively degree of depth, and promptly the upper limit of ever-frozen ground is elevated, and insulation treatment measures that Here it is are protected the basic principle of ever-frozen ground.
The job practices of the heat insulation regulation and control roadbed of Permafrost Area speedway 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 XPS plate isolation layer; XPS plate isolation layer forms by the 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 are provided with boss and are used for splicing.XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to lay, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay.Outside whole laying work area end, place scattered XPS plate in the 5m of extension.
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, nappe forward, the land leveller leveling with the loader filler of will having more than needed; Road roller rolls, and avoids construction machinery directly to roll XPS plate isolation layer.After reaching design elevation, the road surface pavement deck.
The employed XPS plate technique of XPS plate isolation layer requires: 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: richness ice, full freezing soil section, when the roadbed height does not pass through the pasture and water marsh less than 2.5m, 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 is provided with gutter 107, adopts Φ 25 pvc pipes with holes, and gutter 107 connects with drainage system is suitable.
Step 3: fill the thick sandy gravel stratum 104 of 30cm on the back-up sand gravel bed 105 again changing; Sandy gravel stratum 104 end faces are laid one deck plastic-steel geotechnical grid 103, and plastic-steel geotechnical grid 103 above decks take 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 road surface structare layer 101 following 30cm places; Bonding slope, bend place is straight; Lay XPS plate isolation layer 102; XPS plate isolation layer 102 forms by the 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 are provided with boss and are used for splicing.XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to lay, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay.Outside whole laying work area end, place scattered XPS plate in the 5m of extension.
Step 5: on the 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, nappe forward, the land leveller leveling with the loader filler of will having more than needed; 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: richness ice, full freezing soil section, when the roadbed height passes through the pasture and water marsh less than 2.5m, see Fig. 1:
Step 1: fill thick impact-rolling sandy gravel stratum 105 impact-rollings of 50cm and go into above-ground route 108 times, after the leveling of impact-rolling sandy gravel stratum 105 impact-rollings, fill the sandy gravel stratum 104 of 30cm on it again.
Step 2: lay one deck plastic-steel geotechnical grid 103 at sandy gravel stratum 104 end faces, plastic-steel geotechnical grid 103 above decks take 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 road surface structare layer 101 following 30cm places; Bonding slope, bend place is straight; Lay XPS plate isolation layer 102; XPS plate isolation layer 102 forms by the 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 are provided with boss and are used for splicing.XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to lay, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay.Outside whole laying work area end, place scattered XPS plate in the 5m of extension.
Step 4: on the 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, nappe forward, the land leveller leveling with the loader filler of will having more than needed; 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 the 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 is provided with 2% unidirectional horizontal wall inscription, lays water proof geotextiles 204, and toe is provided with gutter 205, adopts Φ 25 pvc pipes with holes, and gutter 205 and drainage system are along connecing.
Step 3: the strict leveling in road surface structare layer 201 following 30cm places; Bonding slope, bend place is straight; Lay XPS plate isolation layer 202; XPS plate isolation layer 202 forms by the 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 are provided with boss and are used for splicing.XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to lay, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay.Outside whole laying work area end, place scattered XPS plate in the 5m of extension.
Step 4: on the 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, nappe forward, the land leveller leveling with the loader filler of will having more than needed; 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 are provided with gutter 206, and the side slope top is provided with dash sth. made by twisting 208 and gutter 209.
Embodiment 4: when the abrupt slope embankment is passed through in the highway section, see Fig. 3:
Step 1: steep hillslope upper thread and the last side slope following 80cm in boundary or road surface structare layer 301 following 80cm are to step compacting is successively dug in side slope and height interval, above-ground route intersection down; Step excavates from the bottom, and the width of excavation step is 2.0m, and excavation is towards interior tilt 2%～4% horizontal wall inscription; Fill out and dig the every 1m of intersection and carry out tamping one time; Compacting width 8m all changes back-up sand gravel bed 307 after digging step, at excavation step 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 digging the highly place that has a common boundary, be arranged to 2% unidirectional horizontal wall inscription with changing back-up sand gravel 307 end faces, lay one deck water proof geotextiles 304, toe is provided with gutter 305, adopts Φ 25 pvc pipes with holes, and gutter 305 connects with drainage system is suitable.
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 road surface structare layer 301 following 30cm places; Bonding slope, bend place is straight; Lay XPS plate isolation layer 302; XPS plate isolation layer 302 forms by the 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 are provided with boss and are used for splicing.XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to lay, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay.Outside whole laying work area end, place scattered XPS plate in the 5m of extension.
Step 5: on the 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, nappe forward, the land leveller leveling with the loader filler of will having more than needed; 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 are provided with gutter, and road surface structare layer 301 is provided with guardrail 302 near a side on abrupt slope.The side slope top is provided with 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:
The XPS plate is processed according to designing requirement control index and structure design, carries out self check before dispatching from the factory, and the qualified back of self check is all inspected by random samples every time material; To inspecting the advanced pedestrian worker's initial survey of XPS plate, first pressing by random samples, therefrom 5 planks of picked at random are taken a sample at the sheet material diverse location; Inspect by ready samples, entrust the testing agency that XPS plate detectability is arranged, accomplish the third party and detect by the owner; Detect qualified after, can carry out mark to arrival, transport the building site to and use.This link will guarantee that XPS plate proterties and quality adhere to specification.
(2) heat-barrier material transportation and storage
The XPS plate belongs to the inflammable chemical materials of lightweight, requires omnidistance Fire Hazard Area, is transported to the building site and also will encloses bundle 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; Make adequate preparation material therefor, plant equipment, personnel, the intention that clearly designs and construct, to the technician special confide a technological secret after can construct.
(4) construction seasons is selected
Isolation layer roadbed general requirements was arranged construction by the end of June.The construction seasons of laying the XPS plate has considerable influence to frozen soil upper limit under the embankment; Particularly lay in back initial 1～2 year at embankment; Variation tendency with the artificial upper limit in the way of escape is stable gradually; Numerical simulation result shows that the influence of the artificial upper limit just fades away in the 6th year construction seasons satisfies the need.Therefore the construction seasons of XPS plate circuit base preferably can be chosen in winter, if can't construct winter, should avoid maximum and melt dark season, takes all factors into consideration before time that the XPS plate lays should be chosen in by the end of June.
(5) construction equipment is prepared
Prepare construction machinery, transportation, loading and unloading, leveling, each operation of compacting of guaranteeing to satisfy material closely are connected, and form continuous processing line.
(6) protecting passway before the construction builds
The Permafrost Area highway network also is not very perfect at present; In most of keypoint road project constructions, exist and protect the topic of corresponding; This just requires project management team will in time carry out the propaganda of project traffic control and dredges work; Be equipped with special personnel, equipment and carry out with all strength and protect logical work, 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 requires in whole construction course, to carry out closure construction, 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 confirmed
By the setting of the design depth of burying.Embankment (base) fills absolute altitude, horizontal wall inscription etc. under the control isolation layer, carries out compacting by construction requirement, leveling.Strictness control working lining thickness when fill stratum thickness is big, is taked the layering decking and rolling in the construction, 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 checks it whether to reach designing requirement, before the laminated solidity does not reach standard, must not carry out the next process construction.
(8) insulating layer structure layer leveling compacting down
The XPS plate that uses 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 the construction compacting, can't reach isolation layer subgrade construction quality requirement.On plane curve, flatten as far as possible and build this deck, when complete level is had any problem, to guarantee that also (row) insulating board is on the sloping structural plane of same list.This deck is built the quality of handling, and directly influences the construction quality of isolation layer roadbed.
(9) lay XPS plate isolation layer
After underlayer absolute altitude, degree of compaction, planeness reach the control index, with the customization XPS heat-barrier material that meets the demands, to lay according to the design overlapping mode, this link is noted overlap joint and bend handling problem.
When ordering heat-barrier material, should consider to draft overlapping mode, make the overlap joint groove in advance or when constructing, adopt adhesive to glued joint connection by producer, thereby improve workmanship, reduce labour intensity.When laying the two-ply material, each layer is all carried out the fissure of displacement lay.
The straightway alignment elements is simple; Splicing is laid sheet material and is easier to relatively, and the curved section splicing is difficult relatively, and suggestion adopts the method for directly handling to accumulation, concentrated piece to lay; When piece is handled; Piece is used with lumber on-site cutting spelling with irregular sheet material, and the original overlapping mode of adjacent sheet metal is interrupted simultaneously, adopts adhesive to glued joint connection when this place is connected construction.It is sliding along nature that whole section is satisfied in laying, and sheet material embedding jam-packed is close, does not interspace.Satisfy whole district's section fabric width requirement, widen in right amount, reach whole district's section smallest effective width and meet design requirement in part, bend place.
(10) filler and compacting on the layer
Consider sheet material self strength problem, construction machinery can not directly roll the XPS insulating board.After XPS plate laying completion inspection is errorless, transport the upper strata filler to lay section an end discharging with dump truck, by forklift filler is pushed the filler of surplus forward according to the reservation compacted depth; And the like; Accomplish the making work of filler on the sheet material, subsequently with land leveller leveling, road roller compacting.Filler will have adequate thickness just can carry out compacting on the layer, and compacted lift should not be too thin, satisfy the minimum compacted lift thickness that design provides.Degree of compaction meets design requirement on the layer.
(11) be connected transition processing
To non-thermal insulation section transitional region should be provided by the heat preserving and insulating material section is set, make this sudden change controlled.Suggestion unfixed placement XPS sheet material in the 5m of extension outside whole laying work area end for some more sensitive thermal insulations areas, should adopt longer transitional region to reach finer transition effect.
Claims (6)
1. the job practices of the heat insulation regulation and control roadbed of Permafrost Area speedway is characterized in that:
Realize by following steps:
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 the thick sandy gravel stratum of 30cm again; 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 XPS plate isolation layer.
2. the job practices of the heat insulation regulation and control roadbed of Permafrost Area speedway according to claim 1 is characterized in that:
In the step 1, when the pasture and water marsh was passed through in the highway section, one deck plastic-steel geotechnical grid was laid at the sandy gravel stratum top.
3. the job practices of the heat insulation regulation and control roadbed of Permafrost Area speedway according to claim 1 and 2 is characterized in that:
In the step 1, when the abrupt slope roadbed was passed through in the highway section, steep hillslope upper thread and the last side slope following 80cm in boundary or the following 80cm of road surface structare layer were to step compacting is successively dug in side slope and height interval, above-ground route intersection down; Step excavates from the bottom, and the width of excavation step is 2.0m, and excavation is towards interior tilt 2%～4% horizontal wall inscription; Fill out and dig the every 1m of intersection and carry out tamping one time; Compacting width 8m digs all to fill behind the step and changes the back-up sand gravel, at excavation step rolling layers four layers of plastic-steel geotechnical grid of continuous laying from top to bottom; Digging step changes and is filled to that digging has a common boundary highly locates; Be arranged to 2% unidirectional horizontal wall inscription with changing the packing course end face, lay one deck water proof geotextiles, change on it and fill out and fill the thick sandy gravel stratum of 50cm.
4. the job practices of the heat insulation regulation and control roadbed of Permafrost Area speedway according to claim 3 is characterized in that:
In the step 2, gutter is Φ 25 pvc pipes with holes.
5. the job practices of the heat insulation regulation and control roadbed of Permafrost Area speedway according to claim 4 is characterized in that:
In the step 3, when the highway section was arranged on shallow cut, cutting section or abrupt slope embankment section, the road surface structare layer both sides were provided with gutter or guardrail.
6. the job practices of the heat insulation regulation and control roadbed of Permafrost Area speedway according to claim 5 is characterized in that:
In the step 4, XPS plate isolation layer forms by the 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 are provided with boss and are used for overlap joint; XPS plate isolation layer adopts double-deck XPS plate fissure of displacement laying mode to lay, and each row of individual layer XPS plate also adopts fissure of displacement laying mode to lay; Outside whole laying work area end, place scattered XPS plate in the 5m of extension.
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| CN104153269A (en) * | 2014-08-22 | 2014-11-19 | 东南大学 | Conductive-resistant-combined protection method of permafrost under wide subgrade and pavement structure |
| CN104264557A (en) * | 2014-08-28 | 2015-01-07 | 杭州江润科技有限公司 | Semi-filling and semi-excavating ecological subgrade structure and construction method |
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| CN112301805A (en) * | 2020-05-28 | 2021-02-02 | 兰州交通大学 | Roadbed freezing injury treatment device with horizontal bidirectional layered decompression |
| CN112376328A (en) * | 2020-05-28 | 2021-02-19 | 兰州交通大学 | Roadbed freeze injury treatment device with vertical subareas gradually depressurized |
| CN112376328B (en) * | 2020-05-28 | 2022-07-22 | 兰州交通大学 | Roadbed freeze injury treatment device with vertical subareas gradually depressurized |
| CN113026462A (en) * | 2021-03-22 | 2021-06-25 | 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 |
| CN115058932A (en) * | 2022-08-04 | 2022-09-16 | 北京市政路桥股份有限公司 | Roadbed for frozen earth road section and construction method thereof |
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