CN103469701A - Construction method for preparing foamed light soil in site in integrated form to fill substructure of high-speed rail - Google Patents
Construction method for preparing foamed light soil in site in integrated form to fill substructure of high-speed rail Download PDFInfo
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- CN103469701A CN103469701A CN2013103907139A CN201310390713A CN103469701A CN 103469701 A CN103469701 A CN 103469701A CN 2013103907139 A CN2013103907139 A CN 2013103907139A CN 201310390713 A CN201310390713 A CN 201310390713A CN 103469701 A CN103469701 A CN 103469701A
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Abstract
The invention discloses a construction method for preparing foamed light soil in site in an integrated form to fill a substructure of a high-speed rail. The construction method mainly comprises the following steps of building a planetary cement paste blending unit; building a mobile light soil preparation station; arranging spot conveying pipes; foaming a mixing and delivering pump; blending the foamed light soil; delivering the foamed light soil to a filling field; filling, pouring and smashing the foamed light soil in site; and maintaining the foamed light soil. Full automatic foamed light soil equipment including a planetary stirring station and a paste preparing, foaming, mixing and delivering station which form a complete set; multiple steps of the foaming technology and the mixing technology are carried out, and linkage automatic control is realized; the density and the flow of foam and the density and the flow of the light soil are automatically controlled in real time; high productivity is also realized; the productivity of single equipment is higher than 90m(3)/h; and the construction progress, the construction safety and the engineering quality can be ensured.
Description
Technical field
The invention belongs to the realm of building construction, particularly on-the-spot integrated form prepares light-weight foamed soil and fills the high ferro roadbed construction method.
Background technology
Current large-scale hinge station adopts the cross-line road more, and (railway passes in to hair line from station, station basement structure top board position is rail layer and station layer) the form of structure design, take full advantage of the space of station and field, station, facilitated again waiting, riding of passenger.But the train rail basis of this kind of form easily occurs differential settlement in the field, station with station joint portion (digging up and filling in district and cast-in-place concrete structure calmodulin binding domain CaM) roadbed, to a certain degree affect train traffic safety, for addressing this problem, we launch research for the differential settlement of the silt of back filled region, joint portion, the methods such as the scheme that conventional back filled region roadbed is processed has rotary churning pile reinforcing, Reinforcement with Cement-mixed Piles, the earthwork to change to fill out, but, due to the problem that is subject to place spatial limitation and long construction period, implement more difficult.For this reason, a kind of easy construction of needs, the dam filling construction that structure is closely knit.
High-quality light-weight foamed soil has lightweight, density and intensity controllability, high fluidity, orthostatic and constructs the characteristic such as convenient, can be used for substituting backfill, often be widely used in the engineering of the roadbase backfills such as soft base Abutment Back fills, road is extended, fill in precipitous highway section, mountain area, there is unique technology economy advantage.And the high ferro foundation of road bed requires dynamic deformation modulus vd to reach 40MPa and coefficient of subgrade reaction K30 reaches 90MPa/h, by the integrated mixing to light soil, process and strictly control with filling etc., can fill out high-quality light-weight foamed native high ferro roadbed.
The light-weight foamed soil of conventional method construction at present is subject to equipment control, production capacity etc. and limits easily, affects to a certain extent light-weight foamed soil property amount, has following defect:
1, the foam density of conventional light-weight foamed native mixing and foam flow employing needle valve manual adjustments, control unstablely, and error is large, causes foam density and foam instability of flow.
2, conventional light-weight foamed native mixing foam and cement paste adopt manually or the semiautomatic equipment mixing, cause mixed proportion unstable, and error is large, causes light soil density to be controlled unstable, and quality influence is larger.
3, conventional light-weight foamed indigenous equipment production capacity is low, generally at 20 ~ 40m3/h; For improving the normal simple combination that adopts 2 ~ 3 pumps of production capacity, pump one pipe " doing things in his own way ", poor synchronization, quality uniformity is poor, is difficult to meet design and engine request.
Therefore, in the urgent need to the safety of finding the light-weight foamed soil of a kind of high ferro roadbed filling, high-quality, job practices fast.
Summary of the invention
For overcoming the above-mentioned defect of conventional light-weight foamed soil construction, the invention provides a kind of on-the-spot integrated form and prepare the job practices that light-weight foamed soil fills the high ferro roadbed, having adopted full-automatic light-weight foamed indigenous equipment---planetary agitator slurrying adds the mixed dispatch station of foaming a complete set of equipment, realized the multi-step of foaming technique and hybrid technology, the coordinated type automation is controlled, foam density and flow have been realized, the real-time automation of light soil density and flow is controlled, and synchronously realized high production capacity, single complete equipment production capacity is up to more than 90m3/h, can guarantee construction speed, construction safety and workmanship.
In order to realize above-mentioned technical purpose, the present invention has adopted following technical scheme:
On-the-spot integrated form prepares light-weight foamed soil and fills the high ferro roadbed construction method, it is characterized in that comprising the following steps:
(1) set up planetary cement mixer group: described unit mainly is comprised of stirring host, secondary agitation main frame, metering system, frame, cement bin, conveying worm, high-pressure cleaning device, electric-control system, air-channel system; Prepare cement paste by planetary cement mixer group;
(2) set up portable light soil preparation station: described light soil prepares the station owner will comprise that foaming mixes delivery pump;
(3) arrange the site transport pipe: in planetary cement mixer group, with portable light soil, prepare between station and be connected with fluid-conveying pipe; Between light soil preparation station and high ferro subgrade construction to be built scene, with the light soil carrier pipe, be connected;
(4) foaming mixes the light-weight foamed soil of delivery pump mixing and delivers to by carrier pipe the scene of filling: at first expanding foam solution is poured into to foaming and mixed in delivery pump, with compressed air, mix, compressed air and expanding foam solution mix in foam device, and to take expanding foam solution and compressed-air actuated transmitting power be power, form foam stream; The cement paste again prepared by the cement mixer group is delivered to foaming by carrier pipe, and to mix in delivery pump mix and blend abundant, and the light-weight foamed soil of formation is delivered to by carrier pipe the scene of filling;
(5) on-the-spot light-weight foamed soil fills to water and smashes;
(6) light-weight foamed native maintenance.
Further, set up at the planetary stirring machine group employing scene in step 1, and the agitator floor space is not less than 300 square metres; During construction, keep agitator motionless, the site transport pipe moves with the variation in cast work area.Be more convenient for complex environment, irregular structure large figure's high ferro roadbed fast, filling of guaranteeing both quality and quantity.
Mixer in step 1 self has planetary mixing plant, can form revolution and spinning motion.Track complexity when the planetary stirring machine group stirs, stirring movement is strong, and efficiency is high, homogeneity strong and, unit is controlled the overall processes such as the storage automatically complete required material, conveying, metering, stirring by microcomputer, have a stirring efficiency high, the advantages such as homogeneity is strong, simple and convenient operation and maintenance.
The described fluid-conveying pipe of step 3 is 3 cun fluid-conveying pipes.The slurrying of Site station is delivered to foaming by 3 cun fluid-conveying pipes and mixes delivery pump.The supply of cement paste when the method for concentrating like this slurrying pipeline to carry has guaranteed light-weight foamed native mixing, pipeline can be arranged repeatedly along with the variation in cast in situs place simultaneously, constructs convenient and effect is high.
The described light soil carrier pipe of step 3 is 4 cun fluid-conveying pipes.4 cun carrier pipes that light-weight foamed soil connects by foaming mixing delivery pump are pumped to the on-site pouring pound district, pumping line can spreading or shortening along with the variation in Jiao Dao district, separate unit pumping distance is in 300 meters, special long distance pumping can adopt relay pump to add to send mode to fill, and the pumping discrepancy in elevation should be in 30 meters.
Step 6 preferably adopts the plastic sheeting covering curing.Maintenance is convenient and swift, and respond well.
Adopt foaming mixing delivery pump to carry out cement paste and mix with blowing agent, form light-weight foamed soil, by 4 cun light soil carrier pipes, be delivered to the scene of filling.These processes all complete within foaming mixes delivery pump, and the multi-step of foaming technique and hybrid technology, coordinated type automation are controlled, realized the real-time automation control of foam density and flow, light soil density and flow, synchronously realized high production capacity, single complete equipment production capacity is up to 90m
3more than/h.Than regular-type foam light soil construction equipment stir fully, evenly and production capacity high, also guaranteed the quality of light-weight foamed soil.
The inventive method is that a kind of on-the-spot integrated form prepares light-weight foamed soil and fills the high ferro roadbed construction method, set up planetary agitator slurrying by scene, be delivered in foaming mixing delivery pump and carry out the fully mix and blend such as cement paste, expanding foam solution by pipeline, form light-weight foamed soil and be poured into high ferro roadbed zone by delivery pump again, form convenient, lightweight, high-strength foundation of road bed.Adopt job practices of the present invention construction high ferro roadbed, the Dan Zhandan pump can complete about 1600m3 roadbed and build every day, has greatly improved the pouring quality of efficiency of construction and light-weight foamed soil, and comprehensive benefit is obvious.
The present invention adopts on-the-spot integrated form to prepare light-weight foamed native high ferro roadbed filling job practices, has solved the construction difficult problem existed in the prior art, has overcome the various hidden danger that common construction is taken precautions against, and has very large advantage, guarantees construction safety, has accelerated speed of application.
The present invention has following technique effect:
1. construct convenient.
2. light-weight foamed local products energy is high, efficiency of construction is high.
3. the light-weight foamed soil property amount of mixing is good, and the high ferro roadbed of building formation quality is good.
4. safely, effectively accelerated construction speed.
5. be widely used in the roadbed filling construction of various complex environments, wide application, strong adaptability, comprehensive benefit is obvious.
For further illustrating design feature of the present invention and effect, below in conjunction with accompanying drawing, the invention will be further described.
The accompanying drawing explanation
Fig. 1 is the agitator arrangement diagram.
Fig. 2 is that on-the-spot integrated form prepares light-weight foamed soil and fills high ferro subgrade construction overall schematic.
Specific embodiment
On-the-spot integrated form prepares light-weight foamed soil and fills the high ferro roadbed construction method, specifically comprises the following steps:
(1) layout of the light-weight foamed soil mixing station of automation
In conjunction with on-the-spot place characteristics, agitator is set up in the zone little at more spacious construction infection, adopts from mixing the remote pump of cement paste to light-weight foamed native pouring area the light-weight foamed soil of laminated pouring after the foams mix that the light soil of cement paste and front end preparation station generates.The main equipment of constructing is that the planetary agitator of high efficiency smartization and foaming mix dispatch station: during construction, keep agitator motionless, dispatch station moves with the variation in cast work area.
Planetary agitator is set up at the scene, and more spacious position is set up above-mentioned planetary stirring machine group, made reservoir, power distribution room, material stockyard etc. at the scene, and the agitator floor space is not less than 300 square metres.
Planetary cement mixing unit partly is comprised of stirring host, secondary agitation main frame, metering system, frame, cement bin, conveying worm, high-pressure cleaning device, electric-control system, air-channel system etc.The planetary mixing plant of its mixer self can form revolution and spinning motion, so track complexity while stirring, stirring movement is strong, efficiency is high, homogeneity strong and, unit is controlled the overall processes such as the storage automatically complete required material, conveying, metering, stirring by microcomputer, have a stirring efficiency high, the advantages such as homogeneity is strong, simple and convenient operation and maintenance.
For guaranteeing light-weight foamed soil construction continuity, should to pipeline, be carried as far as possible less, and avoid on-the-spot big machinery to pipeline roll destruction etc., should reasonably arrange pipeline.The pipeline at the pipeline of light-weight foamed soil mixing station and preparation station is following to be arranged schematically as follows: agitator → (Pipeline transport) job site → light soil preparation station → (Pipeline transport) job site → light soil pouring area.
For guaranteeing the quality of cement paste, consider that material separates, pump line pressure equal loss's ultimate range is that pipeline is carried 600 meters.Therefore, for guaranteeing the normal conveying of cement paste quality, the distance of construction site is located in 600 meters.If fed distance is above standard, must adopt terminal.Because equipment capacity is larger, the pumping discrepancy in elevation should, in 30 meters, surpass this and highly adopt terminal.
(2) foundation trench excavation construction
Foundation trench adopts the artificial mode of mechanical bond to excavate, according to the representative section that fills foundation trench, at first answer the position of Rapid Excavation to above 0.3m at the bottom of bed course, the mode of then adopt artificial cooperative mechanical retrusive excavation, repairing soil and muck haulage is dug to absolute altitude at the bottom of bed course, avoids machinery walking on the absolute altitude face at the bottom of foundation trench as far as possible.
(3) foundation trench is checked and accepted
Before the foundation trench cushion construction, substrate do not have obvious ponding and foreign material.The deviation that the pouring area planar dimension should be not less than design, substrate elevation and design load should surpass ± 0.1m.
Before casting and constructing, should take pouring area as unit, be poured into a mould place and check and accept.
Designing unit to foundation trench at the bottom of bearing capacity have and explicitly call for, bed course also tackles foundation soil and carries out cone penetration test before watering and smashing.(static sounding refers to the sounding rod indentation test soil layer that utilizes pressure apparatus that contact probe will be arranged, and the throughput examining system is surveyed native penetration resistance, can determine some basic physical mechanics properties of soil; Cone penetration test is applicable to weak soil, general clay, silt, sand and contains the soil of a small amount of rubble.Pore water pressure (u) when static sounding can be determined specific penetration resistance (ps), static point resistance (qc), side friction power (fs) and injection according to the requirement of engineering reconnaissance.）
(4) bed course waters to smash with composite geo-membrane and lays
Before cushion construction, should guarantee that foundation trench is without ponding.Notice that the vertical construction of bed course should be outer as many as 0.5m to light-weight foamed soil cast partition boundaries.
For ease of shuttering supporting, can vertically pour into a mould at light-weight foamed soil that the reserved 3cm of boundary position is wide, 5cm firmly gets groove.
Bed course adopts the mode of commercial concrete pumping to be watered and smashes, roughly the same the ordinary structural concrete constructure scheme.
For not destroying the composite geo-membrane of light soil bottom, the bed course top should be struck off processing, not stay the projection aggregate, is as the criterion.
When bed course top geomembrane is laid, should note the lap width between reserved different pouring areas.
(5) mixing of light-weight foamed soil
At first expanding foam solution is poured in delivery pump, mixed with compressed air, compressed air and expanding foam solution mix in foam device, and to take expanding foam solution and compressed-air actuated transmitting power be power, form certain foam stream.Again cement paste is delivered in pump to mix and blend by carrier pipe abundant, form light-weight foamed soil and be delivered to by 4 cun carrier pipes the scene of filling.These processes all complete within foaming mixes delivery pump, and the multi-step of foaming technique and hybrid technology, coordinated type automation are controlled, realized the real-time automation control of foam density and flow, light soil density and flow, synchronously realized high production capacity, single complete equipment production capacity is up to 90m
3more than/h.
(6) watering of light-weight foamed soil smash
Answer the division that building body is carried out block and layer of watering to design such as bonding apparatus production capacity, construction period before construction, in order to water, smashing constructs carries out Correlative plan.Should remove foreign material in pouring area before construction, especially should clear the ponding in base, when building, dewatering measure should be arranged below groundwater table, forbidding has pouring construction under the state of water in substrate.
6.1 fill the setting of subregion and settlement joint
Before the light soil cast, according to work point engineering geological conditions and fringe conditions, first poured into a mould subregion.The division of pouring area should meet following requirement:
1. single pouring area top surface area the most very much not should surpass 400m2.
2. single pouring area long axis direction length should not surpass 50m.
3. the pitch plank that adjacent pouring area is thick with 2cm props up gear interval parting, and the pitch plank is interim shelves template the double settlement joint of doing.
6.2 protective bulkhead construction processing
Fill and light-weight foamedly earth roadbed protective bulkhead should be set, the selection of protective bulkhead should meet durability, intensity and appearance requirement, should select coagulation great soil group, stone materials masonry or directly adopt the thin wall-type concrete guard wall.
With the building structure abutment wall, process: an elongated settlement joint of wide 2cm is established respectively in be everlasting light soil and built construction structure abutment wall contact site, inside establishes the pitch plank.
6.3 light soil casting and constructing main points
The light-weight foamed soil of this engineering method adopts the mode of pumping to build, and while building, discharging opening should be embedded in light soil, and in the time can't meeting the demands, discharging opening should be controlled in 1m from the discrepancy in elevation of building a little.
1. before light-weight foamed native casting and constructing, should guarantee the final set of concrete bed course.
2. light-weight foamed native individual layer cast thickness is pressed 0.3m ~ 1.0m control; The neighbouring pouring layer of same section, when construction period temperature is not less than 15 ℃, the shortest cast can be controlled by 8 hours interval time; Otherwise cast should be not less than 12 hours interval time.
3. the casting and constructing time of the single pouring area pouring layer of light-weight foamed soil should be controlled in 2 hours.
4. should from an end, to the other end, build along the pouring area long axis direction; As while adopting the cast of one or more gate spool, can be abreast since an end cast, or adopt the pouring type at diagonal angle.
5. in casting process, when the mobile gate spool of needs, the direction that should place along gate spool moves forward and backward, and should not move left and right gate spool; As really needed to move left and right gate spool, gate spool should be proposed as far as possible currently to move again after having built the light soil surface.
While 6. being put down surface, should make sprue gate maintenance level as far as possible, and make sprue gate low as far as possible from the current light soil surface of building.
7. reduce as far as possible walk up and down having watered in not yet curing light soil.
(7) construction is processed at the light soil top
After the light-weight foamed soil of roadbase backfill completes, the materials such as conditioned soil and ballast aggregate often need be laid in top.
7.1 wire lath and composite geo-membrane are laid
1. when light soil is filled to absolute altitude 5.0m (light soil top design absolute altitude 5.5m), lay one deck galvanized wire mesh, and galvanized wire mesh adopts Φ 1 ~ 2mm@5cm * 5cm specification.
When 2. wire lath is laid, should adopt staple to carry out anchoring, vertically anchoring spacing 2m, horizontal anchoring spacing 1.0m.Overlapping overlap joint is answered in the wire lath plan-position, and lap width is not less than 5cm, and lap-joint uses the iron wire colligation also with U-shaped nail anchoring.
3. in the settlement joint position, wire lath should disconnect laying.
7.2 light soil upper structural layer construction
Before improve soil construction, should guarantee that light-weight foamed native top real curing protects when intensity is not less than 0.5MPa and can launch; And, before improve soil construction, should adopt plastic sheeting to carry out moisture-keeping maintaining to light-weight foamed native top, until conditioned soil starts construction.
After light soil is backfilled to original ground, at the light soil top layer, lay thick 5% Cement Soil of one deck 30cm, and folder spreads one deck composite geo-membrane betwixt.
Claims (6)
1. on-the-spot integrated form prepares light-weight foamed soil and fills the high ferro roadbed construction method, it is characterized in that comprising the following steps:
(1) set up planetary cement mixer group: described unit mainly is comprised of stirring host, secondary agitation main frame, metering system, frame, cement bin, conveying worm, high-pressure cleaning device, electric-control system, air-channel system; Prepare cement paste by planetary cement mixer group;
(2) set up portable light soil preparation station: described light soil prepares the station owner will comprise that foaming mixes delivery pump;
(3) arrange the site transport pipe: in planetary cement mixer group, with portable light soil, prepare between station and be connected with fluid-conveying pipe; Between light soil preparation station and high ferro subgrade construction to be built scene, with the light soil carrier pipe, be connected;
(4) foaming mixes the light-weight foamed soil of delivery pump mixing and delivers to by carrier pipe the scene of filling: at first expanding foam solution is poured into to foaming and mixed in delivery pump, with compressed air, mix, compressed air and expanding foam solution mix in foam device, and to take expanding foam solution and compressed-air actuated transmitting power be power, form foam stream; The cement paste again prepared by the cement mixer group is delivered to foaming by carrier pipe, and to mix in delivery pump mix and blend abundant, and the light-weight foamed soil of formation is delivered to by carrier pipe the scene of filling;
(5) on-the-spot light-weight foamed soil fills to water and smashes;
(6) light-weight foamed native maintenance.
2. job practices according to claim 1, is characterized in that, set up at the planetary stirring machine group employing scene in step 1, and the agitator floor space is not less than 300 square metres; During construction, keep agitator motionless, the site transport pipe moves with the variation in cast work area.
3. job practices according to claim 1, is characterized in that, the mixer in step 1 self has planetary mixing plant, can form revolution and spinning motion.
4. job practices according to claim 1, is characterized in that, the described fluid-conveying pipe of step 3 is 3 cun fluid-conveying pipes.
5. job practices according to claim 1, is characterized in that, the described light soil carrier pipe of step 3 is 4 cun fluid-conveying pipes.
6. job practices according to claim 1, is characterized in that, step 6 adopts the plastic sheeting covering curing.
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| CN114560719A (en) * | 2022-03-09 | 2022-05-31 | 中国建筑第二工程局有限公司 | Foamed lightweight soil material for high sulfate erosion resistance environment, preparation and application |
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| CN104928996A (en) * | 2015-06-24 | 2015-09-23 | 中铁第四勘察设计院集团有限公司 | Light soil side wide roadbed structure for railway |
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| WO2023159712A1 (en) * | 2022-02-24 | 2023-08-31 | 广东盛瑞科技股份有限公司 | In-situ road construction method using in-situ soil |
| CN114560657A (en) * | 2022-03-09 | 2022-05-31 | 中国建筑第二工程局有限公司 | Large-scale racetrack soft soil foundation filling foam light soil material, preparation method and application |
| CN114560719A (en) * | 2022-03-09 | 2022-05-31 | 中国建筑第二工程局有限公司 | Foamed lightweight soil material for high sulfate erosion resistance environment, preparation and application |
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