CN102605697A - Sand dredger filling construction method of soft soil foundation embankment - Google Patents
Sand dredger filling construction method of soft soil foundation embankment Download PDFInfo
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Abstract
The invention discloses a sand dredger filling construction method of a soft soil foundation embankment. The sand dredger filling construction method comprises the steps of: (1) cleaning the surface of an embankment dredger filling field; (2) measuring and lofting, and setting an elevation mark of the dredger filling construction in a dredger filling region; (3) performing the dredger filling work in a manner of segmenting and layering, to be specific, forming a cofferdam, establishing plastic water discharge plates, building construction roads, distributing grit blasting pipe lines, dredger-filling the embankment, constructing a drain opening, and constructing water collecting wells; and (4) performing stability observation and settlement observation on the dredge-filled sand land of the embankment. The sand dredger filling construction method disclosed by the invention has the advantages of solving the flatness problem of road area at coastal tidelands, rivers, fishponds and the like, performing roadbed filling of municipal administration by fully making use of the characteristics of abundant fin sand resource in the local area, reducing exploitation usage amount of the land resource, decreasing construction cost while guaranteeing construction quality of the roadbed, being simple, convenient, feasible, efficient and practical, increasing working efficiency, saving cost and creating conditions for advanced construction of the next procedure.
Description
Technical field
The present invention relates to a kind of town road embankment job practices, specifically, relate to that gush in a kind of fish pond, river, the embankment hydraulic fill sand job practices of coastal beach soft foundation.
Background technology
Exploitation, opening along with the coastal area; The soil can not satisfy the needs of urban development as scarce resource, and the coastal most of coastline of China is a silt coast, and physical features is smooth near especially coastal, great river, the river mouth, great river; Weak soil distributes extensively, and geological condition is complicated.Lower because of physical features when building port works in the coastal area, backfill lacks and often adopts the mode of hydraulic reclamation to form land-based area.How the barged-in fill soft foundation is carried out appropriate processing rationally, can guarantee the service property (quality) of engineering, can practice thrift investment again, this plays important effect to coastal area engineering construction and economic development.
Soft foundation is generally apron beach-seabeach landforms, and the pond distributes more, and mud is thicker, builds the sidewalk difficulty, and the shortage of native source.As filling mode with common embankment, need to build sidewalk, take the farmland, freight is high, goes back contaminated environment, and construction cost is high, and the duration is longer.
Summary of the invention
The present invention will solve is riverine, the coastal area technical problem in the enterprising walking along the street dike construction of soft foundation, provide a kind of simple and easy to do, efficient is high, reliable in quality, the soft foundation embankment hydraulic fill sand job practices that can under multiple condition, construct.
In order to solve the problems of the technologies described above, the present invention is achieved through following technical scheme:
A kind of soft foundation embankment hydraulic fill sand job practices, this job practices is carried out according to following steps:
(1) the embankment blast-filled ground is shown clearly;
(2) measure setting-out, set up the dredge fill bench mark in the hydraulic reclamation district simultaneously;
(3) staged and layered is carried out the hydraulic reclamation operation:
A., the first floor cofferdam is set, fixed fabric bag, fine sand in the hydraulic reclamation in the textile bags;
B. the embankment hydraulic reclamation district between the cofferdam lays the blast pipeline is installed;
C. embankment first floor segmentation hydraulic reclamation, next section of spreading pipeline hydraulic reclamation after one section hydraulic reclamation finishes, the edge joint tube edge is pushed ahead;
D. carry out the construction of first floor discharge opening in the downstream of blast, adopt sand pocket to pile up on the cofferdam, the inboard one deck waterproof sealing film of laying of sand pocket is reserved the discharge opening of opening as the overflow weir form between the top layer sand pocket; Along with near the rising of the hydraulic fill sand face absolute altitude discharge opening, corresponding adjustment improves the weir crest overflow absolute altitude of discharge opening during dredge fill, keeps the weir crest spillwag chute and the hydraulic fill sand face discrepancy in elevation more than 0.5m, and the discharge opening two ends are connected with the cofferdam, and its inside and outside side slope is consistent with the cofferdam;
E., second layer cofferdam is set on the first floor cofferdam, and embankment hydraulic reclamation district lays installs the blast pipeline, and embankment second layer segmentation hydraulic reclamation advances while tear pipe open backward, and second layer discharge opening construction simultaneously so back and forth finishes until hydraulic reclamation;
The stability of (4) carrying out embankment hydraulic reclamation sandy ground is observed and settlement observation.
Set plastic draining board on the cofferdam body in cofferdam described in the said step (3).
The external side in the cofferdam in cofferdam described in the said step (3) is built pioneer road.
In the said step (3) during the operation of embankment hydraulic reclamation used hydraulic fill sand require mud content less than 10%.
Arrange dust-collecting bucket during the operation of embankment hydraulic reclamation in the said step (3), said dust-collecting bucket is the cylindrical shape reinforcing cage structure of top opening, and its set inside has pumping equipment; Per 60 meters along the line a precipitation section is set at embankment, each section bottom is provided with 3 dust-collecting buckets in the hydraulic reclamation width, dust-collecting bucket external application geotextiles parcel.
Discharge opening whenever is provided with one at a distance from 20～30m along the line at embankment in the said step (3).
The invention has the beneficial effects as follows:
(1) solved in coastal beach ground, river gush, the smooth problem in road place, location such as fish pond; Make full use of the resourceful characteristics of fine sand in the locality; Carry out the town road roadbed filling; When can guarantee the subgrade construction quality, reduce exploitation use amount, reduced construction costs land resources.
The middle fine sand of gathering when (two) using the desilting of part navigation channel is turned waste into wealth, and has reduced the pollution to the coastal waters.
(3) simple and easy to do, effectively practical, increase work efficiency, practice thrift cost, having constructed in advance for next procedure creates conditions.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, certain town road engineering of giving an example now is an example, specifies embankment hydraulic fill sand job practices of the present invention:
This project road levelling of the land hydraulic reclamation length 10.66Km; The hydraulic reclamation engineering quantity is 177.5 ten thousand steres; The regional present situation landforms of this engineering are: plant and the low-lying land offered along original road both sides; And original ditch pool, on-the-spot physical features is uneven, and the land route road of marching into the arena only can get into from original road temporarily.The analysis that provides according to engineering geological condition in reconnaissance trip and the preliminary design; Engineering geological conditions is the mutual sedimentary deposits of Quaternary system marine facies; Mainly contain compositions such as miscellaneous fill, mucky soil and loam, have that compactness inequality, varied in thickness are big, engineering properties is poor, water content height and a low characteristic of supporting capacity.The engineering zone is positioned at coastal beach area, and hypsography low-lying is mainly wetlands, any of several broadleaf plants forest land along the line, and local location is distributed with between the wide field of old 1～3m the sandstone dirt road and marches into the arena, and existing part vegetation in needs before the dredge fill it is removed and appears on the scene.Run off in order to prevent that hydraulic fill sand from reducing in the precipitation process in water, in the sand removing hole front filter screen is set one, muddy water can pass through from filter screen, and sand is stayed.
1, clear table: adopt excavator waterborne, swamp bulldozer, large-scale haulage vehicle to remove weeds, foreign material etc. in the place, so that follow-up construction.
2, cofferdam:
2.1, measure setting-out, require to measure setting-out according to working drawing, be inserted in the water as mark post with bamboo pole.
2.2, cofferdam sand pocket technical indicator is following:
2.2.1, sand pocket adopts 200g/m
2Age inhibiting polypropylene woven cloth is made, and the specifications and characteristics of establishment cloth is as shown in table 1;
200g/m
2Anti-aging geotextiles technical requirements table 1
Annotate: tensile strength, elongation per unit length, aperture and the transmission coefficient index in a. table must test rating for construction.
Do the construction check by 10000 square meter random samplings when b. constructing, the check of table projects is gone up in the every batch of sampling of stocking up.
2.2.2, the splicing of sand pocket and make and must adopt the overseam method, make the bright and beautiful logical sequence line that adopts sufficient intensity, the intensity of making the joint must not be less than 70% of former cloth intensity;
2.2.3, sand pocket is laid on vertical laying of cofferdam or separation levee, bag is long so that make with laying construction convenient definitely for principle, generally is not less than 30m;
2.2.4, the sand pocket back-up sand can adopt in fine sand; Particle diameter surpasses 85% of gross mass greater than the particle of 0.075mm; Mud content (particle diameter is less than the shared ratio of 0.005mm clay) requires per 10000 cubes of sand material to get an appearance and carries out grain size analysis test less than 10%, the quality of check sand material;
2.2.5, sand pocket filling thickness generally is not less than 0.6m, but also is not more than 0.8m, indicate size except;
2.2.6, the joint of adjacent sand pocket should be close to, when the situation of establishing two-layer above sand pocket, the joint of levels sand pocket should stagger;
2.2.7, sand pocket in work progresss such as making, transportation, stacking, laying, should note the protection, breakage, aging phenomenon must not appear; For the anti-aging geotextiles, the intensity that requires nature to expose after 3 months is not less than 80% of former intensity;
2.2.8, to laying and the sand pocket of filling, carry out quality inspection, Interventions Requested: plan-position, joint, thickness, inspection frequency: every sand pocket is no less than 5 points, 10% of joint;
2.2.9, quality requirement: allowable error: ± 0.3m is laid on the plane, and sand pocket thickness is design load ± 0.1m, and adjacent sand pocket does not contact to defective.
2.3, the cofferdam top width: according to the needs of hydraulic reclamation engineering construction, and convenient construction personnel walking, comprehensively confirm the weir crest width.
2.4, the cofferdam side slope: according to engineering survey report, embankment back filled region silt depth and according to " dredging works technical specification " (JTJ319-99) in, confirm the gradient of inside and outside side slope.
2.5, on the body of cofferdam, set plastic draining board
2.5.1, the model of plastic draining board, specifications and characteristics requirement
Band drain adopts the SPBC type, wherein: the wide 100 ± 2mm of complex, thick >=4.5mm, every volume length 200 ± 2m, vertical water-flowing amount >=40cm, tensile strength >=1.5KN/103cm, elongation per unit length >=4%.Filter membrane transmission coefficient >=5 * 103cm/s is at a distance from soil nature＜75 μ m, dry state and hygrometric state tensile strength >=30N/cm.In order to guarantee that but construction quality requires the band drain depth measurement, perhaps have the code data of beating, can calculate the degree of depth of construction drainage plate at the scene.
2.5.2, construction requirement:
A. draining plate hole bit error is not more than 5 centimetres;
B. the band drain vertical missing is no more than 1.5%;
C. going into the well band drain must be intact;
D. band drain length must meet design requirement, length, the hole depth of every band drain of record during construction, and the obstacle that the process of setting runs into special circumstances such as beats with mending.
2.5.3, the effect of plastic draining board: on the body of cofferdam, set plastic draining board, the pore water in the body bottom sludge of cofferdam got rid of, guarantee the stable of cofferdam body, prevent the measure skid.
2.6, construction area is positioned at former plant, must be before the hydraulic reclamation in boundary lines of roads arranged outside hydraulic reclamation cofferdam, meet when culturing the small reservoir dike when the hydraulic reclamation cofferdam, weir capable of using dike is built the hydraulic reclamation cofferdam no longer again as the hydraulic reclamation cofferdam.Other zone is with machine-processed sand pocket vallation cofferdam, because the degree of depth of water is different, the cofferdam is divided into following principle:
2.6.1, the depth of water 4～7m.(1) during cofferdam construction, the wide sand pocket of the two-layer 33m of first making, after fill the sand pocket cofferdam to absolute altitude 1.0m, blast sets plastic draining board to 1.0m in the place when tide water level is lower than 1.0m.(2) adopt the layering hydraulic reclamation, every layer thickness is not more than 1.0m, requires the place to blow after full one deck one deck under the hydraulic reclamation again.(3) the every linear meter(lin.m.) engineering quantity in sand pocket cofferdam:
2.6.2, the depth of water 2～4m.(1) during cofferdam construction, sand pocket cofferdam making is during to absolute altitude 1m, and blast sets plastic draining board to 1.0m in the place when tide water level is lower than 1.0m.(2) behind the big sand pocket of the ground warp cofferdam, hydraulic reclamation is to absolute altitude 1.7m.(3) layering blast, every layer thickness is not more than 1m, requires the place to blow after full one deck one deck under the hydraulic reclamation again.(3) the every linear meter(lin.m.) engineering quantity in sand pocket cofferdam:
2.6.3, the depth of water 1～2m.When (1) sand pocket making in cofferdam arrives apart from water surface 0.5m, beginning layering blast, every layer thickness is not more than 1m.(2) the every linear meter(lin.m.) engineering quantity in sand pocket cofferdam:
2.6.4, the land, the build dam body that bankets is adopted in the cofferdam, dam body is protected with sand pocket in both sides then, cofferdam top width 2m, the gradient is 1: 2, adopts a blast to the top mark height.
2.7, pioneer road fills
Pioneer road is built in the outside of body in the cofferdam, both sides, and a side just Construction traffic is current, and opposite side convenient construction personnel walking reduces construction cost.The sand pocket end face fills the cubic metre of earth and stone and is not less than 0.5m, and other reserves the thick earthwork of 0.5m and uses as follow-up reparation sidewalk.Sand pocket end face width is 8m, and opposite side sand pocket end face width is 4m.
3, the blast pipeline sets up installation: the laying of blast pipeline is the important component part of hydraulic reclamation engineering, and reasonably pipe line arrangement helps guaranteeing to supply the speed of sand, carrying out smoothly of enhancing productivity and guarantee to construct.The blast pipeline is made up of the floating pipe of waters part, land-based area part bank pipe in the floating outward pipe of embankment, the embankment pipe support head He Wei district during boats and ships construction.The blast pipe line arrangement should be carried out according to following principle:
3.1, the blast pipeline should adopt steel pipe or the high density polyethylene pipe of DN315 and DN250, and connects with the form of flange or socket joint, prevents in the blast process to occur because of pressure is excessive that interface comes off or the booster phenomenon.When the blast pipeline is longer than 4km, adopt the force (forcing) pump hydraulic reclamation.
3.2, from blast ship to shore limit section
Blast ship to shore limit section is mainly laying floating Guan Weizhu, making things convenient for blast ship adjustment accommodation and direction, and inhales sand, hydraulic reclamation and dodges sand carrier and unload operations such as sand.Require the blast pipe must with the floating drum fixation, prevent in the blast process to cause to come off because of blast pipe string is moving.
3.3 zone from the bank to the hydraulic reclamation
The hydraulic reclamation pipeline is erected at stiff soil matrix as far as possible and is convenient on the embankment of personnel operation, and this zone can be put on the spot, but must be with its relative fixed on the ground, and pipeline should adopt the mode of floating pipe or erection bracket to support laying when mud and waters.
3.4 in the hydraulic reclamation zone
Hydraulic reclamation district hydraulic reclamation is accomplished through prolonging the pipeline method, sets up the dredge fill bench mark in the hydraulic reclamation district during construction, and it is on duty to strengthen the hydraulic reclamation district, and control prolongs the pipe adapter time, guarantees due dredge fill elevation and guarantees planeness.
4, confirm the hydraulic fill sand method according to the hydraulic reclamation width:
By the engineering actual conditions, can take roadbed full width hydraulic reclamation or half range hydraulic reclamation.During the full width hydraulic reclamation, the sediment outflow pipe is laid in the middle of the embankment, the enough full width width of disposable hydraulic reclamation, this mode is applicable to that the embankment width is less than 30m with do not build the highway section in cofferdam in advance.During the half range hydraulic reclamation; The sediment outflow pipe can be laid along the embankment center line, also can along about two half ranges in the middle of successively lay or lay simultaneously at two half ranges, when the embankment center line is laid; The leading portion of sediment outflow pipe should connect with rubber tube; So that the sediment outflow pipe mouth of pipe can about two half ranges move, the half range hydraulic reclamation can reduce the compacting workload that laterally pushes away the sand workload, this mode is applicable to that width of subgrade is greater than 30m with build the highway section in cofferdam in advance.The distance of the sediment outflow mouth of pipe and water retaining dike should be confirmed according to sediment outflow pipe caliber and water dike actual conditions.Should leave more than the 5m when in general, sediment outflow pipe caliber is for＜250mm; Caliber is＜during 400mm, should leave more than the 10m.
This engineering adopts feeds the technology construction that sand blast is filled out, and the blast ship is selected debarkation point, 3 place, and apart from the distance of the about 2000m～4000m in hydraulic reclamation zone, every blast ship fixedly is docked in according to the nearest marine site of blast point.With the self-priming self-discharging ship sand carrier is unloaded to storage sand ship getting the sand that the sand point ships, then by blast ship pump to construction area, the hydraulic reclamation face need be uniformly distributed with hydraulic reclamation by the operating personnel by the zone.The sand source is positioned at the stone railing state, puts about 3～6 nautical miles apart from blast, existing sand 1,000 ten thousand m that deposit
3
The construction of layer and section hydraulic reclamation method, the layering hydraulic reclamation can make the cofferdam combine better with water-bed mud, and mud outwards squeezes draining under the weight in layering cofferdam, and bearing capacity increases; The stability in cofferdam is improved after the hydraulic fill sand.After first floor cofferdam and hydraulic reclamation are stable, carry out second layer cofferdam and hydraulic fill sand again and construct, make the stress balance that is up to the standard between cofferdam and the hydraulic fill sand.Through the layering hydraulic reclamation, reach vertical stress balance between cofferdam and hydraulic fill sand and the mud, lift height is not more than 1 meter.
With layer segmentation hydraulic reclamation, utilize horizontal cofferdam that the hydraulic reclamation embankment is carried out segmentation, can increase the monolithic stability in cofferdam, the eliminating of muddy water in the favourable hydraulic reclamation process, the embankment of formation can carry out the next procedure construction at short notice.With layer section length is 200～300 meters.
5, hydraulic reclamation:
The hydraulic reclamation of embankment is taked the way construction with layer segmentation, and the length of segmentation is confirmed by the productivity ratio of hydraulic reclamation equipment and embankment width.Next section of spreading pipeline hydraulic reclamation after one section hydraulic reclamation finishes, the edge joint tube edge is pushed ahead; After a layer hydraulic reclamation finishes together, advance backward while tear pipe again open, one deck under the hydraulic reclamation, so reciprocal.When the distance of dredge fill surpasses the maximum capacity of equipment, can take the way of secondary pressurization or secondary suction.The secondary pressurization is in the middle of dredge boat or sediment outflow pipe, to set up force (forcing) pump; Secondary suction is to utilize pumping equipment the sand material to be pumped into the terminal of certain distance; Take out through secondary from terminal again and blow the equipment hydraulic reclamation to roadbed; Terminal is located at innavigable river bend or be advisable in the fish pond, if be located at the fish pond, the secondary pumping equipment can adopt the suction type equipment that sprays.
5.1, the layering hydraulic reclamation, every layer thickness is not more than 1.0m, requires the place to blow after full one deck one deck under the hydraulic reclamation again.
5.2, after blowing out the water surface, the high discrepancy in elevation of local hydraulic reclamation heap must not be greater than 1.0m;
5.3, sand shipping sand outside the place, adopt small-sized blast pump and flexible pipe that sand blast is filled into the field, in the blast process, the mouth of pipe that shakes out has the special messenger be responsible for to move to shake out position, the thickness of strict control blast;
5.4, take over and displacement: the progressive direction of sand body hydraulic reclamation and blast direction are consistent, and when the place ahead blew out enough work planes, spreading or movement pipeline hydraulic reclamation position prevented that sand body from depositing in good time.
5.5, discharge opening cleaning with increase: in the hydraulic reclamation process, the foreign matters such as weeds original place in possibly silt discharge opening up, and are common in order to guarantee to sluice, and should in time clean out blast-filled ground with silting thing up; Simultaneously, must raise, in time increase the discharge opening elevation according to the hydraulic fill sand face.
6, to the quality requirement of sand
6.1, hydraulic fill sand adopt in fine sand, material requirements is: particle diameter surpasses 85% of gross mass greater than the particle of 0.075mm, particle diameter less than the content of 0.005mm clay less than 10%;
6.2, hydraulic fill sand face absolute altitude 1.7m, allowable error+200mm ,-100mm detects blast layer end face absolute altitude according to 50 * 50m pitch arrangement grid;
6.3, blast accomplishes back mensuration elevation of top surface and handing in 1～2 week.
6.4, after construction finishes, when heavy-duty machinery is marched into the arena construction, must take anti-settling measure and dewatering measure effectively, promptly as early as possible sand body is carried out dewatering measure.
7, hydraulic reclamation absolute altitude control: set up the dredge fill bench mark in the hydraulic reclamation district during construction, it is on duty to strengthen the hydraulic reclamation district, prolongs the pipe adapter time, guarantees due dredge fill elevation and guarantees planeness.This engineering adopts bamboo pole to control foundation as absolute altitude, 3 bamboo poles in each cross section, and vertical 50 meters bamboo poles meet design requirement to guarantee dredge fill elevation and planeness.
8, get sand
8.1 get the sand point selection: because this hydraulic reclamation operation is to the having relatively high expectations of sand, so this construction is got the sand point to be chosen in the region extraction that closes on beyond the marine site.
8.2 getting sand ship machine selects:
Select for use following ship machine to carry out operation on the sea according to engineering characteristic
(1) self-priming self-unloading sand ship
The self-priming self-discharging ship is named a person for a particular job sand from being drawn onto on the ship getting sand, transports to the blast ship then and is blown to the appointed area by blast ship pump.Self-priming self-unloading sand ship is a single-ship operation, have conveniently, flexibly, suffer the little characteristics of stormy waves influence.
This engineering is intended the self-priming self-unloading sand ship of selecting for use has 11 approximately, when getting sand with the operation of fortune sand, but sand ship self-priming every day self-unloading 2 flight numbers.
(2) grab boat
In view of the construction period of engineering, the self-priming self-unloading sand ship of intending configuration can't satisfy engineering and get sand and fortune sand intensity and schedule requirement, needs to arrange 1 8m
3Grab boat and a 6m
3Grab boat, and supporting 7 sand carriers carry out this engineering and get sand and fortune sand construction operation.Grab bucket is dug and husky is grabbed on the sand carrier of digging sand getting sand, and sand carrier is transported to sand storage tank, and sand is unloaded in sand storage tank.
9, discharge opening
9.1, the position confirms
Whenever a discharge opening is set,, should lays Polypropylence Sheet around the discharge opening with the protection embankment to discharge the muddy water that blast brings at a distance from 20～30m.Discharge opening is provided with and adopts the mode in sand pocket mixing cofferdam to construct.The discharge opening setting is chosen in the downstream of blast, and top mark height and end absolute altitude should be confirmed according to the adjustment of hydraulic reclamation absolute altitude.
9.2, discharge opening construction
The discharge opening structure adopts can regulate hydraulic reclamation district water level; During dredge fill along with near the rising of the hydraulic fill sand face absolute altitude discharge opening; Corresponding adjustment improves the weir crest overflow absolute altitude of discharge opening; Keep the weir crest spillwag chute and the hydraulic fill sand face discrepancy in elevation more than 0.5m, reduce the concentration of hydraulic mixture that releases water, prevent the secondary pollution of water body.The discharge opening two ends are connected with the cofferdam.The inside and outside side slope of discharge opening is consistent with the cofferdam, paves river bottom protection in the inside and outside both sides of discharge opening with sand pocket, makes the fan type.The discharge opening width is 3 meters, highly for cofferdam sand pocket thickness.
10, collecting well
Carry out fast smoothly for guaranteeing the later stage treatment of soft foundation; Arrange that when the hydraulic reclamation operation collecting well is with water emptying in fast with the cofferdam; Collecting well is set is used for getting rid of the water in the sand body fast, after draining finishes the reinforcing cage collecting well is removed, fill hole to dense state with identical sand.
10.1 the position is confirmed
Each section is provided with 3 collecting wells in the hydraulic reclamation width, and per 60 meters along the line are provided with a precipitation section, and add collecting well at the original ground nadir, collecting well external application geotextiles parcel.
End absolute altitude should be adjusted definite according to hydraulic reclamation and original ground absolute altitude.
10.2 reinforcing bar collecting well
10.3 pumping equipment
Drainage plant is selected 2 cun gasoline water pumps (horse 50KB-2G is praised in water pumper model Shanghai) for use, draws water and divides into groups to carry out.
11, construction monitoring method
11.1, stability observation
11.1.1, the stability in cofferdam can obtain through the displacement of observation skirt piles.Vertically every separated 50m is provided with a measuring frequency section along the cofferdam.
11.1.2, the displacement observation skirt piles bury underground and observe main points following:
A. the displacement observation skirt piles are embedded in both sides, cofferdam toe, and the skirt piles of same measuring frequency section are buried 4 displacement skirt piles underground.
B. skirt piles adopt steel pipe to add the concrete making, and concrete strength is not less than C25, every long 2m.
C. the depth of burying of skirt piles is not less than 1.2m and is advisable below the face of land, and method of installation can adopt to be squeezed into or excavate and bury underground, and the packing of stake circumference is real, and all top 50cm of stake build fixing with concrete, and is firm to guarantee.
11.2, settlement observation
11.2.1, hydraulic fill sand face of land observation buries settlement plate underground and carries out elevation observation on original ground, settlement plate is embedded in road axis and both sides.Settlement plate adopts 50cm * 50cm * 3cm steel plate, and the metal measuring staff adopts ф 4cm steel pipe, every joint 50cm, and protective casing adopts the plastic pipe of ф 8cm, the long 54cm of every joint.
11.2.2, settlement plate observation adopts S1 type level gauge, with the levelling elevation that the secondary medium accuracy requires, accuracy of observation should be less than 1mm.
Although above the preferred embodiments of the present invention are described; But the present invention is not limited to the above-mentioned specific embodiment, and the above-mentioned specific embodiment only is schematically, is not restrictive; Those of ordinary skill in the art is under enlightenment of the present invention; Not breaking away under the scope situation that aim of the present invention and claim protect, can also make the concrete conversion of a lot of forms, these all belong within protection scope of the present invention.
Claims (6)
1. soft foundation embankment hydraulic fill sand job practices is characterized in that this job practices is carried out according to following steps:
(1) the embankment blast-filled ground is shown clearly;
(2) measure setting-out, set up the dredge fill bench mark in the hydraulic reclamation district simultaneously;
(3) staged and layered is carried out the hydraulic reclamation operation:
A., the first floor cofferdam is set, fixed fabric bag, fine sand in the hydraulic reclamation in the textile bags;
B. the embankment hydraulic reclamation district between the cofferdam lays the blast pipeline is installed;
C. embankment first floor segmentation hydraulic reclamation, next section of spreading pipeline hydraulic reclamation after one section hydraulic reclamation finishes, the edge joint tube edge is pushed ahead;
D. carry out the construction of first floor discharge opening in the downstream of blast, adopt sand pocket to pile up on the cofferdam, the inboard one deck waterproof sealing film of laying of sand pocket is reserved the discharge opening of opening as the overflow weir form between the top layer sand pocket; Along with near the rising of the hydraulic fill sand face absolute altitude discharge opening, corresponding adjustment improves the weir crest overflow absolute altitude of discharge opening during dredge fill, keeps the weir crest spillwag chute and the hydraulic fill sand face discrepancy in elevation more than 0.5m, and the discharge opening two ends are connected with the cofferdam, and its inside and outside side slope is consistent with the cofferdam;
E., second layer cofferdam is set on the first floor cofferdam, and embankment hydraulic reclamation district lays installs the blast pipeline, and embankment second layer segmentation hydraulic reclamation advances while tear pipe open backward, and second layer discharge opening construction simultaneously so back and forth finishes until hydraulic reclamation;
The stability of (4) carrying out embankment hydraulic reclamation sandy ground is observed and settlement observation.
2. a kind of soft foundation embankment hydraulic fill sand job practices according to claim 1 is characterized in that, sets plastic draining board on the cofferdam body in cofferdam described in the said step (3).
3. a kind of soft foundation embankment hydraulic fill sand job practices according to claim 1 is characterized in that, the external side in the cofferdam in cofferdam described in the said step (3) is built pioneer road.
4. a kind of soft foundation embankment hydraulic fill sand job practices according to claim 1 is characterized in that, in the said step (3) during the operation of embankment hydraulic reclamation used hydraulic fill sand require mud content less than 10%.
5. a kind of soft foundation embankment hydraulic fill sand job practices according to claim 1; It is characterized in that; Arrange dust-collecting bucket during the operation of embankment hydraulic reclamation in the said step (3), said dust-collecting bucket is the cylindrical shape reinforcing cage structure of top opening, and its set inside has pumping equipment; Per 60 meters along the line a precipitation section is set at embankment, each section bottom is provided with 3 dust-collecting buckets in the hydraulic reclamation width, dust-collecting bucket external application geotextiles parcel.
6. a kind of soft foundation embankment hydraulic fill sand job practices according to claim 1 is characterized in that, discharge opening whenever is provided with one at a distance from 20～30m along the line at embankment in the said step (3).
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| CN2012100326971A CN102605697A (en) | 2012-02-14 | 2012-02-14 | Sand dredger filling construction method of soft soil foundation embankment |
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| CN2012100326971A CN102605697A (en) | 2012-02-14 | 2012-02-14 | Sand dredger filling construction method of soft soil foundation embankment |
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| CN102605697A true CN102605697A (en) | 2012-07-25 |
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| CN2012100326971A Pending CN102605697A (en) | 2012-02-14 | 2012-02-14 | Sand dredger filling construction method of soft soil foundation embankment |
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| CN103243624A (en) * | 2013-05-14 | 2013-08-14 | 中铁二十一局集团第四工程有限公司 | Construction method for salty soil district railway roadbed with water content lower than liquid limit |
| CN103276649A (en) * | 2013-06-21 | 2013-09-04 | 云南云岭高速公路桥梁工程有限公司 | Method for constructing multi-thickness rockfill embankment with lateral confinement and layering functions |
| CN103572680A (en) * | 2012-08-02 | 2014-02-12 | 五冶集团上海有限公司 | Road roadbed filling construction method of coal mine gob |
| CN103758018A (en) * | 2014-02-24 | 2014-04-30 | 中国十九冶集团有限公司 | Method for controlling road surface elevation of roadbed |
| CN104452665A (en) * | 2014-11-20 | 2015-03-25 | 浙江省围海建设集团股份有限公司 | Abyssal region seawall sand quilt laying method |
| CN105178125A (en) * | 2015-10-15 | 2015-12-23 | 中交第一公路工程局有限公司 | Lake region high filling road base sand blowing embankment construction method and embankment structure |
| CN105862676A (en) * | 2015-09-24 | 2016-08-17 | 中交天航港湾建设工程有限公司 | Blow-filling method and structure for controlling difference elevation of mud surface after treatment and unloading of soft foundation |
| CN107268365A (en) * | 2017-06-23 | 2017-10-20 | 云南新同程建设集团有限公司 | A kind of Construction of Soft Soil Subgrade technique |
| CN108611932A (en) * | 2018-05-15 | 2018-10-02 | 中铁第六勘察设计院集团有限公司 | It is a kind of pass through pool, fish pond location multiply road railway high-fill roadbed construction method |
| CN109137818A (en) * | 2018-10-10 | 2019-01-04 | 河海大学 | A kind of model equipment and its implementation method of indoor simulation hydraulic fill sand construction effect |
| CN109235366A (en) * | 2018-11-02 | 2019-01-18 | 中铁四局集团有限公司 | A kind of hydraulic fill sand construction method |
| CN109355990A (en) * | 2018-11-29 | 2019-02-19 | 中国电建集团成都勘测设计研究院有限公司 | Low-level bog area hydraulic reclamation ultra fine sand road structure |
| CN109972468A (en) * | 2019-03-19 | 2019-07-05 | 温州大学 | A kind of construction method for reinforcing hydraulic fill sand embankment |
| CN110080051A (en) * | 2019-03-29 | 2019-08-02 | 河海大学 | A kind of soil engineering bag bridge-type embankment structure and its construction method |
| CN111485463A (en) * | 2020-04-26 | 2020-08-04 | 中铁二十三局集团第三工程有限公司 | Roadbed splicing construction method in expressway reconstruction and expansion |
| CN112064582A (en) * | 2020-08-25 | 2020-12-11 | 天津市北洋水运水利勘察设计研究院有限公司 | Construction process method for reducing dredger fill loss |
| CN112502093A (en) * | 2020-12-25 | 2021-03-16 | 浙江省围海建设集团股份有限公司 | Sand-filled pipe bag type seawall closure control method |
| CN112709190A (en) * | 2020-12-25 | 2021-04-27 | 浙江省围海建设集团股份有限公司 | Dam reinforcement control method |
| CN113062266A (en) * | 2021-03-24 | 2021-07-02 | 中铁十六局集团有限公司 | Construction process for filling sand bag of slurry pump |
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| CN103572680A (en) * | 2012-08-02 | 2014-02-12 | 五冶集团上海有限公司 | Road roadbed filling construction method of coal mine gob |
| CN103572680B (en) * | 2012-08-02 | 2016-01-20 | 五冶集团上海有限公司 | The roadbed filling construction method of coal mine gob |
| CN103243624B (en) * | 2013-05-14 | 2015-06-03 | 中铁二十一局集团第四工程有限公司 | Construction method for salty soil district railway roadbed with water content lower than liquid limit |
| CN103243624A (en) * | 2013-05-14 | 2013-08-14 | 中铁二十一局集团第四工程有限公司 | Construction method for salty soil district railway roadbed with water content lower than liquid limit |
| CN103276649A (en) * | 2013-06-21 | 2013-09-04 | 云南云岭高速公路桥梁工程有限公司 | Method for constructing multi-thickness rockfill embankment with lateral confinement and layering functions |
| CN103276649B (en) * | 2013-06-21 | 2015-09-09 | 云南云岭高速公路建设集团有限公司 | Side is had to limit layering many thickness Stone Filled Embankment construction method |
| CN103758018A (en) * | 2014-02-24 | 2014-04-30 | 中国十九冶集团有限公司 | Method for controlling road surface elevation of roadbed |
| CN103758018B (en) * | 2014-02-24 | 2016-01-20 | 中国十九冶集团有限公司 | Control the method for the road surface elevation of roadbed |
| CN104452665A (en) * | 2014-11-20 | 2015-03-25 | 浙江省围海建设集团股份有限公司 | Abyssal region seawall sand quilt laying method |
| CN105862676A (en) * | 2015-09-24 | 2016-08-17 | 中交天航港湾建设工程有限公司 | Blow-filling method and structure for controlling difference elevation of mud surface after treatment and unloading of soft foundation |
| CN105178125B (en) * | 2015-10-15 | 2018-04-17 | 中交第一公路工程局有限公司 | A kind of lake region High-filled emkankment is blown sand embankments construction method and embankment structure |
| CN105178125A (en) * | 2015-10-15 | 2015-12-23 | 中交第一公路工程局有限公司 | Lake region high filling road base sand blowing embankment construction method and embankment structure |
| CN107268365A (en) * | 2017-06-23 | 2017-10-20 | 云南新同程建设集团有限公司 | A kind of Construction of Soft Soil Subgrade technique |
| CN108611932A (en) * | 2018-05-15 | 2018-10-02 | 中铁第六勘察设计院集团有限公司 | It is a kind of pass through pool, fish pond location multiply road railway high-fill roadbed construction method |
| CN109137818A (en) * | 2018-10-10 | 2019-01-04 | 河海大学 | A kind of model equipment and its implementation method of indoor simulation hydraulic fill sand construction effect |
| CN109235366A (en) * | 2018-11-02 | 2019-01-18 | 中铁四局集团有限公司 | A kind of hydraulic fill sand construction method |
| CN109355990B (en) * | 2018-11-29 | 2023-09-19 | 中国电建集团成都勘测设计研究院有限公司 | Ultra-fine sand roadbed structure for hydraulic filling in low-lying marsh areas |
| CN109355990A (en) * | 2018-11-29 | 2019-02-19 | 中国电建集团成都勘测设计研究院有限公司 | Low-level bog area hydraulic reclamation ultra fine sand road structure |
| CN109972468A (en) * | 2019-03-19 | 2019-07-05 | 温州大学 | A kind of construction method for reinforcing hydraulic fill sand embankment |
| CN110080051B (en) * | 2019-03-29 | 2021-07-02 | 河海大学 | Geotextile bag bridge type embankment structure and construction method thereof |
| CN110080051A (en) * | 2019-03-29 | 2019-08-02 | 河海大学 | A kind of soil engineering bag bridge-type embankment structure and its construction method |
| CN111485463A (en) * | 2020-04-26 | 2020-08-04 | 中铁二十三局集团第三工程有限公司 | Roadbed splicing construction method in expressway reconstruction and expansion |
| CN112064582A (en) * | 2020-08-25 | 2020-12-11 | 天津市北洋水运水利勘察设计研究院有限公司 | Construction process method for reducing dredger fill loss |
| CN112502093A (en) * | 2020-12-25 | 2021-03-16 | 浙江省围海建设集团股份有限公司 | Sand-filled pipe bag type seawall closure control method |
| CN112709190A (en) * | 2020-12-25 | 2021-04-27 | 浙江省围海建设集团股份有限公司 | Dam reinforcement control method |
| CN113062266A (en) * | 2021-03-24 | 2021-07-02 | 中铁十六局集团有限公司 | Construction process for filling sand bag of slurry pump |
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Application publication date: 20120725 |