CN102747662A - Construction method for sand-filling subgrade - Google Patents
Construction method for sand-filling subgrade Download PDFInfo
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- CN102747662A CN102747662A CN2012102481223A CN201210248122A CN102747662A CN 102747662 A CN102747662 A CN 102747662A CN 2012102481223 A CN2012102481223 A CN 2012102481223A CN 201210248122 A CN201210248122 A CN 201210248122A CN 102747662 A CN102747662 A CN 102747662A
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Abstract
The invention relates to the field of constructional engineering, and particularly relates to a construction method for a sand-filling subgrade. The construction method for the sand-filling subgrade is characterized by comprising the following steps: clearing the subgrade, setting a drainage system, embedding a settlement and displacement observing device, starting paving, testing degree of compaction, and constructing a top-sealing layer. The construction method has the advantages of using high permeability characteristic of fine sand of Yangtze estuary to reasonably control construction moisture content for replacing high-quality soil as subgrade filler; using clay waste formed by processing subgrade substrate to fill an edge-covered soil structure and carrying out greening on the edge-covered soil structure; using a synchronous construction method for edge-covered soil and fine sand to ensure good connection and integral stability of the fine sand and the edge-covered soil; and effectively controlling and protecting the construction progress and the surrounding environment and reducing reduce the corresponding engineering cost.
Description
Technical field
The present invention relates to building engineering field, be specifically related to a kind of job practices of sand-filled subgrade.
Background technology
High-quality soil is the traditional method in the road construction as roadbed filling.The regional network of rivers such as Shanghai is intensive, the low area, alluvial plain, high quality filler serious lack of belonging to of physical features.If fetch earth in the farmland nearby, improve the back as roadbed filling, will damage a large amount of high-qualitys and plough, cause a series of environment and social concern; If certainly will cause the increase of road construction cost at a distance again from nonlocal muck haulage.Therefore, seek novel roadbed filling and become pressing for of this area's road project.
Develop rapidly along with the means of transportation infrastructure; Begun in the domestic high-grade highway engineering construction to attempt as roadbed filling with the entrance of Changjiang River fine sand; Build sand-filled subgrade, but the sand-filled subgrade engineering still is faced with material source selection, compacting mechanism and method, compacting criteria and quality control at present, many technical problems such as surrounding environment protection when constructing.
In recent years, aspect sand-filled subgrade, do research and application in various degree both at home and abroad, obtained certain achievement.Yet, in entrance of Changjiang River fine sand and drift-sand and the routine, equal gap is very big at aspects such as packing property, pavement performances for thick river sand, can not arbitrarily indiscriminately imitate.Engineering Projects so that the entrance of Changjiang River fine sand is filling roadbed is also very limited, and lacking effective practical experience can be for reference, causes aspects such as design and construction to exist great uncertainty and risk.
Summary of the invention
The objective of the invention is weak point according to above-mentioned prior art; A kind of job practices of sand-filled subgrade is provided; This method is through adopting core to replace high-quality soil as roadbed filling, and according to the compacting requirement of roadbed different layers position, combination of choose reasonable construction machinery and construction parameter thereof; Realize the sand-filled subgrade feasibility, calmly built construction dangerously, and promoted its resistance to overturning.
Realization of the present invention is accomplished by following technical scheme:
A kind of job practices of sand-filled subgrade; Relate to the sand-filled subgrade structure; Said sand-filled subgrade structure is made up of core, bound edge rendzinas, closedtop layer, road structure; Said closedtop layer, road structure are set in turn in said core top, and said bound edge soil is supported in said core both sides, it is characterized in that: said job practices has following steps at least:
(a) cleaning of roadbed table soil is removed, and the clay side of abandoning that wherein produces banks up subsequent use;
(b) in its both sides the gutter is set along the roadbed direction in said roadbed bottom; Vertical, the horizontal french drain of roadbed substrate;
(c) bury sedimentation and displacement observation device underground;
(d) bound edge rendzinas making, back-up sand making, and both construct simultaneously, and said bound edge rendzinas adopts the said clay side of abandoning in the said step (a);
(e) the said back-up sand paving process in the step (d), said bound edge rendzinas paving process are carried out the degree of compaction test;
(f) closedtop layer making construction.
The roadbed substrate of said step (b) vertically, laterally the job practices of french drain is following: after the bottom leveling of said roadbed rolls completion, measure unwrapping wire, the vertical french drain of twice is set respectively in the toe both sides; Between said vertical french drain, horizontal french drain is set; On said french drain, lay geotextiles, rubble is positioned on the geotextiles, put down height afterwards and mend low; Treat to wrap up with geotextiles after french drain fills completion, and roll the receipts face.
In the closedtop layer, along roadbed longitudinal separation gutter is set, the drain hole of said gutter is towards said roadbed, and its inboard mouth of pipe wraps up with geotextiles.
The concrete steps of said step (c) are: on original ground, bury settlement plate underground, carry out elevation observation in the shallow layer settling observation stake at curb place; The 3-5m place buries the displacement observation stake underground and carries out displacement observation outside said roadbed toe place and toe.
The concrete steps of said step (d) are: construction both sides one deck bound edge is native earlier, and behind the grinding compacting, inboard ultra wide position is excised in manual work, and geotextiles is translated into earlier on one side, avoids sand to mix phenomenon; Beginning and of the back-up sand construction of said bound edge soil with layer, the sand junction repeats to roll to reaching degree of compaction standard, and beginning down again, the construction of one deck bound edge soil rolls.
The concrete steps of back-up sand processing are in the said step (d): adopt waterwheel to replenish and sprinkle water to 14%-15%; With crawler dozer is high by the center, road, trackside is low, horizontal wall inscription is controlled at 2.0%-2.5% and paves thick flatly, flattens with land leveller then; Local location is aided with artificial leveling; After the smooth end, adopt road roller to roll immediately, and the said water content that rolls guarantor's back-up sand in the process is more than 6%.
The mode that rolls of said road roller is following: with the speed static pressure of 1.5km/h-1.7km/h 1-2 time, frequency, the 1.1mm-1.3mm amplitude vibration with 2.0-2.5 km/h, 28Hz rolls 3-8 time again, at last again with identical speed static pressure one time.
The concrete steps of said step (e) are: the lime stabilized soil that adopts 5% lime consumption is divided into making 2-3 time as the closedtop layer, and every layer of making is controlled at 15-20cm; And after making is accomplished; Carry out 7 days maintenance, treat that its intensity stabilization increases and the maintenance expiration after, carry out the steady layer of water making again.
Said vertical french drain cross dimensions is 50x50cm, and the spacing between said horizontal french drain is 20m.
Said step (e) is: the degree of compaction of said bound edge rendzinas, fine sand roadbed is carried out the core cutter method test; Said core cutter method has following steps at least: from said fine sand roadbed, take out a certain amount of fine sand test specimen and carry out indoor dry density test; With said cutting ring said fine sand test specimen dry density is measured; Calculate between two dry densities ratio and with its correction factor as said cutting ring, the correction factor of said cutting ring is applied in the on-the-spot test.
Advantage of the present invention is: 1, utilize the characteristics of entrance of Changjiang River fine sand high osmosis, the moisture content of control construction rationally replaces high-quality soil as roadbed filling.
2, fill the bound edge soil structure, also implement above that to afforest the clay side of abandoning that utilizes the roadbed base treatment to form.
3, adopt bound edge soil and the synchronous construction method of fine sand, guarantee the good linking and the monolithic stability of fine sand and bound edge soil.
4, realization reduces the corresponding engineering expense to the effective control and the protection of construction speed, surrounding enviroment.
Description of drawings
Fig. 1 is a sand-filled subgrade structure chart of the present invention;
Fig. 2 is a construction flow chart of the present invention.
The specific embodiment
Through embodiment characteristic of the present invention and other correlated characteristic are done further explain below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
Shown in Fig. 1-2, mark 1-5 is respectively among the figure: road structure 1, closedtop layer 2, core 3, bound edge rendzinas 4, roadbed 5.
Embodiment: the processing process of present embodiment is following:
1, the cleaning of roadbed table soil is removed
According to the job specfication requirement, with bulldozer roadbed 5 table soil to be removed before the construction, the weeds on the original ground, tree root, detritus soil are scavenged into beyond roadbed 5 scopes.Clear table soil should be concentrated as far as possible and pile in a side (opposite side is as pioneer road), so that greening utilizes.As running into situation such as bright creek, dark creek, handle in the clear table process, can carry out follow-up construction after meeting the demands by design document.After clear table is accomplished, roll before filling out comprehensively.
2, drainage system is set
The drainage system of roadbed 5 bottoms is provided with by design document.The anti-draining means that can select in the construction have: roadbed both sides longitudinal drainage ditch, vertical, the horizontal french drain of embankment substrate etc. are set.Lay geotextiles on the french drain surface; With further enhancing drainage effect; Require the geotextiles width to exceed french drain scope 0.25m, lap width must not be less than 0.25m simultaneously), the carefully designs of portions such as should suitably excavating vertical shallow ridges before the paving structure in closedtop laminar surface both sides that finishes as yet not of the domatic sluicing groove of embankment, the construction of closedtop layer.
For the discharge that table rainwater, greening vegetation irrigation water infiltrate of leading the way of following central strip; Can consider in hardcore bed vertically every at a distance from 20m along road; Pvc pipe toward the domatic arranged outside diameter of embankment 8cm requires the inboard mouth of pipe to wrap up with geotextiles, to play reverse filter effect.
The blind ditch construction method: the substrate leveling is carried out the french drain excavation after rolling completion, cooperates hand excavation's french drain with mini-excavator behind the measurement unwrapping wire, uses the wide bucket of 50cm, the soil that digs out is transported to concentrate with automobile stack.The french drain cross dimensions is 50x50cm, horizontal french drain spacing 20m, and the toe both sides are provided with the vertical french drain of twice.
After geotextiles is completed in manual work, put into french drain with loading mechanical shovel fortune graded broken stone, manual work is put down height and is mended low.Treat to wrap up with geotextiles after french drain fills completion, the geotextiles junction respectively exceeds 25cm.To roll the receipts face again with road roller.
Entrance of Changjiang River fine sand roadbed adopts acupuncture geotextiles layering parcel, is laterally laid by three to four manual works.Should be noted that in the construction following some:
(1) smooth foundation trench before the laying;
(2) lay the bound edge soil that to do both sides before the geotextiles earlier;
(3) length in reserve at assurance geotextiles two is so that carry out anti-package at first floor and second layer fine sand both sides.Every side is reserved more than the 1.9m from the toe of bound edge soil;
(4) lap width up and down of geotextiles is not less than 1.5m.
3, bury sedimentation and displacement observation device underground
Settlement observation is employed in the shallow layer settling observation stake at the settlement plate buried underground on the original ground and curb place and carries out elevation observation, displacement observation be employed in roadbed toe place and toe in addition the displacement observation stake buried underground of 3-5m place carry out displacement observation.The burial place of settlement plate, settlement observation stake and displacement observation stake must ensure correctness by the design document requirement, and notes the protection in the roadbed filling work progress.
After sedimentation and displacement observation device are buried completion underground, should in time observe.Whenever filling one deck during the roadbed filling should observe once, if fill blanking time for twice when longer, observation was once at least in per 3 days; Observation should be looked the base stabilization situation and decide during the roadbed piling prepressing, and generally speaking, per 3 days of first month observe once, and second and third month observed once in per 7 days, observes once in per 15 days from four month, finishes until the precompressed phase.All observation datas should in time write down, gather and finishing analysis, and pinpoint the problems check in time or repetition measurement are handled.
According to designing requirement,,, road also should proceed settlement observation in using base period for following the tracks of the long-term effect that ground is handled.
Only when sedimentation and rate of displacement are in the permissible value scope of design; Fill just and can normally carry out; If the observation rate of settling >=1.0cm/d; Or horizontal movement >=0.5cm/d, should stop immediately banketing and observe every day, when three days sedimentation of Continuous Observation and displacement are in the controlling value scope, could continue loading.
4, bound edge rendzinas 4 construction (with 5, back-up sand construction carry out simultaneously)
Sand-filled subgrade adopts the protection mode of geotextiles bound edge rendzinas 4, and lime intermingled quantity is 5%.The construction technology process of bound edge rendzinas 4 is following: measurement unwrapping wire → upward native → spill slaked lime → mix rendzinas → small-sized road-mixed machine secondary mix → leveling → road roller to roll → deburring of degree of compaction detection → unwrapping wire.
(1) bound edge rendzinas 4 wide 1.8m, side slope are pressed design document, in work progress, widen about 1m laterally, to guarantee the degree of compaction that rolls width and side slope of road roller.
(2) bound edge rendzinas 4 with fill sand construction basic synchronization and carry out, construction both sides one decks (20cm is thick) bound edge soil earlier, behind the grinding compacting, inslope is repaiied in manual work, carries out one deck (20cm is thick) again and fills the sand construction.
(3) bound edge rendzinas 4 adopts the road-mix method construction, with small-sized road-mixed machine the rendzinas secondary stirring evenly and with soil block is smashed.
(4) detect the water content of rendzinas before rolling, guarantee near optimum moisture content (moisture content 14.5%), behind the static pressure one time, land leveller is smart flat by the Height control stake that the surveyor emits.
(5) coefficient of loose laying of bound edge rendzinas 4 and compaction technology should be confirmed according to the test road of each bid section.
(6) after bound edge rendzinas 4 rolls completion, should in time carry out degree of compaction and detect, compaction requirement and equivalent layer position to fill sand facies same.
5, back-up sand construction (carrying out simultaneously) with a last step 4, the construction of bound edge soil lime
When (1) on the sand road base of acceptance(check), continuing to fill last layer, should be according to on-site actual situations, the water content that watering in time keeps having filled layer of sand is near optimum moisture content, so that the sand-transport truck turnover.When dark rut occurring, need in time to push away flat, road roller and roll with bulldozer.In gradient section significantly, the place mat steel plate is to guarantee the fine sand normal transport.
(2) fine sand paves and flattens: push away flatly roughly with crawler dozer, then with land leveller leveling, loose laying depth is confirmed according to the test road.Crawler dozer is high by the center, road, trackside is low, and horizontal wall inscription is controlled at 2.0%-2.5% and paves thick flat; Then, the top layer water content to sand of sprinkling water is a little more than optimum moisture content (moisture content 14.5%), and carefully smooth with land leveller again, indivedual uneven places are aided with artificial levelling.After the smooth end, adopt road roller to roll immediately.To local water content position on the low side, can before compacting, replenish and sprinkle water to optimum moisture content.What extra in addition needs were illustrated is: in actual field back-up sand construction, find: when entrance of Changjiang River fine sand moisture content greater than 15% the time, be prone to cohere on the road roller steel wheel, cause surface finish bad, have a strong impact on degree of compaction; And when moisture content less than 14% the time, the too small fine sand that causes again of moisture content is comparatively loose, does not reach the degree of compaction of expection, is optimum moisture content so select moisture content 14.5% through test.
(3) wipe shaping with land leveller off by two side direction central authorities are preliminary after, roll fast immediately 1-2 time with road roller, use the land leveller shaping more once afterwards, local location is aided with artificial leveling.Carry out repeatedly so repeatedly, up to the gradient that reaches regulation and road camber.Each integer all according to the rules elevation and horizontal wall inscription hanging wire is carried out, and the leveling of attention seam crossing, makes it to reach pleasantly smooth.
(4) controlling the water content of sand well is the key of sand road base construction.Roll in the process, the water content that must guarantee back-up sand core 3 then should in time be supplied like deficiency more than 6%.
(5) rolling compaction machine of sand road base and technology can be confirmed according to the test road of each bid section, are as the criterion to reach compaction requirement.As use vibroroller cmpacting, short arc is adopted in suggestion.The rolling speed of road roller begins twice and adopts 1.5-1.7km/h, adopts 2.0-2.5km/h later on.Require when rolling to roll the wheelmark lap width greater than 20cm.
6, closedtop layer 2 construction
After the construction of sand road base is accomplished, should in time go up the seal construction.Roadbed closedtop layer adopts lime stabilized soil in the site operation, and its component ratio (mass ratio) is a lime: entrance of Changjiang River fine sand=5:100, promptly lime intermingled quantity is 5%.
The general layer 2-3 that divides carries out making.Every layer of making THICKNESS CONTROL is at 15-20cm.Treat that the rendzinas making finishes, need carry out 7 days maintenance, make the rendzinas health, intensity stabilization increases.After the maintenance expiration, carry out the making of steady layer of water and follow-up road structure 1 again.
Closedtop layer 2 material also can adopt cement stabilized soil (cement+clay) or cement stabilizing sand (cement+entrance of Changjiang River fine sand) in the practical implementation process; And indexs such as the flexure of above-mentioned two kinds of materials, the modulus of resilience all meet design requirement; But because cement is difficult for stirring in construction, so the lime stabilized soil selected of present embodiment is in quality control on construction and construct and all have greater advantage than cement class material aspect easy.
Claims (10)
1. the job practices of a sand-filled subgrade; Relate to the sand-filled subgrade structure; Said sand-filled subgrade structure is made up of core, bound edge rendzinas, closedtop layer, road structure; Said closedtop layer, road structure are set in turn in said core top, and said bound edge soil is supported in said core both sides, it is characterized in that: said job practices has following steps at least:
The cleaning of roadbed table soil is removed, and the clay side of abandoning that wherein produces banks up subsequent use;
In its both sides the gutter is set along the roadbed direction in said roadbed bottom; Vertical, the horizontal french drain of roadbed substrate;
Bury sedimentation and displacement observation device underground;
Bound edge rendzinas making, back-up sand making, and both construct simultaneously, and said bound edge rendzinas adopts the said clay side of abandoning in the said step (a);
Said back-up sand paving process in the step (d), said bound edge rendzinas paving process are carried out the degree of compaction test;
The construction of closedtop layer making.
2. the job practices of a kind of sand-filled subgrade according to claim 1; It is characterized in that: the roadbed substrate of said step (b) vertically, laterally the job practices of french drain is following: after the bottom leveling of said roadbed rolls completion, measure unwrapping wire, the vertical french drain of twice is set respectively in the toe both sides; Between said vertical french drain, horizontal french drain is set; On said french drain, lay geotextiles, rubble is positioned on the geotextiles, put down height afterwards and mend low; Treat to wrap up with geotextiles after french drain fills completion, and roll the receipts face.
3. the job practices of a kind of sand-filled subgrade according to claim 1, it is characterized in that: in the closedtop layer, along roadbed longitudinal separation gutter is set, the drain hole of said gutter is towards said roadbed, and its inboard mouth of pipe wraps up with geotextiles.
4. the job practices of a kind of sand-filled subgrade according to claim 1, it is characterized in that: the concrete steps of said step (c) are: on original ground, bury settlement plate underground, carry out elevation observation in the shallow layer settling observation stake at curb place; The 3-5m place buries the displacement observation stake underground and carries out displacement observation outside said roadbed toe place and toe.
5. the job practices of a kind of sand-filled subgrade according to claim 1; It is characterized in that: the concrete steps of said step (d) are: construction both sides one deck bound edge is native earlier, behind the grinding compacting, and the inboard ultra wide position of artificial excision; And geotextiles translated into earlier on one side, avoid sand to mix phenomenon; Beginning and of the back-up sand construction of said bound edge soil with layer, the sand junction repeats to roll to reaching degree of compaction standard, and beginning down again, the construction of one deck bound edge soil rolls.
6. the job practices of a kind of sand-filled subgrade according to claim 1 is characterized in that: the concrete steps of back-up sand processing are in the said step (d): adopt waterwheel to replenish and sprinkles water to 14%-15%, with crawler dozer is high by the center, road, trackside is low; Horizontal wall inscription is controlled at 2.0%-2.5% and paves thick flat; With the land leveller leveling, local location is aided with artificial leveling, after the smooth end then; Adopt road roller to roll immediately, and said rolling keep the water content of back-up sand to be not less than 6% all the time in the process.
7. the job practices of a kind of sand-filled subgrade according to claim 6; It is characterized in that: the mode that rolls of said road roller is following: with the speed static pressure of 1.5km/h-1.7km/h 1-2 time; Frequency, 1.1mm-1.3mm amplitude vibration with 2.0-2.5 km/h, 28Hz rolls 3-8 time again, at last again with identical speed static pressure one time.
8. the job practices of a kind of sand-filled subgrade according to claim 1; It is characterized in that: the concrete steps of said step (e) are: the lime stabilized soil that adopts 5% lime consumption is divided into making 2-3 time as the closedtop layer, and every layer of making is controlled at 15-20cm; And after making is accomplished; Carry out 7 days maintenance, treat that its intensity stabilization increases and the maintenance expiration after, carry out the steady layer of water making again.
9. the job practices of a kind of sand-filled subgrade according to claim 2, it is characterized in that: said vertical french drain cross dimensions is 50x50cm, and the spacing between said horizontal french drain is 20m.
10. the job practices of a kind of sand-filled subgrade according to claim 1; It is characterized in that: said step (e) is: the degree of compaction of said bound edge rendzinas, fine sand roadbed is carried out the core cutter method test; Said core cutter method has following steps at least: from said fine sand roadbed, take out a certain amount of fine sand test specimen and carry out indoor dry density test; With said cutting ring said fine sand test specimen dry density is measured; Calculate between two dry densities ratio and with its correction factor as said cutting ring, the correction factor of said cutting ring is applied in the on-the-spot test.
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