CN102926303A - Method for reinforcing soft soil foundation settlement control pile foundation bracket of high-grade highway in use - Google Patents
Method for reinforcing soft soil foundation settlement control pile foundation bracket of high-grade highway in use Download PDFInfo
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- CN102926303A CN102926303A CN2012104761869A CN201210476186A CN102926303A CN 102926303 A CN102926303 A CN 102926303A CN 2012104761869 A CN2012104761869 A CN 2012104761869A CN 201210476186 A CN201210476186 A CN 201210476186A CN 102926303 A CN102926303 A CN 102926303A
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Abstract
The invention discloses a method for reinforcing the soft soil foundation settlement control pile foundation bracket of a high-grade highway in use. The method comprises the following technical steps: partitioning the highway segment to be reinforced; constructing a hoard for the first partition; arranging the hole drilling position; drilling holes to the designed depth; ejecting high-pressure cement grout into the drill holes by using a cement-grout ejecting pipe, rotating and pulling to the top surface of a soft soil layer to form high-strength cement-soil piles with variable diameters; filling cement mortar into the drill holes so that the holes in the filling of the embankment are filled with the cement mortar to the bottom surface of the pavement structure layer; filling the drilled holes in the pavement structure layer range with asphalt surface material; repeating the steps until the construction of the whole highway is finished. During the construction of the highway, vehicles can run normally; the hole drilling causes less damage to the pavement structure layer; and the piles fulfill the function of supporting the embankment, so that the post-construction settlement of the subgrade of the highway is reduced greatly. The method provided by the invention adopts simple construction procedures, is convenient to operate, is economical and efficient and has a good implementation effect.
Description
Technical field
The invention belongs to building and traffic engineering technical field, particularly active service high-grade highway soft soil base sedimentation is controlled again reinforcement means of pile foundation rest.
Background technology
China's expressway construction develop rapidly, and the most of speedway of China is positioned at the coastal region in east China, at the coastal area building highway, has the problem of a large amount of Soft Ground.At the soft clay area building highway, need to solve the uneven subsidence of roadbed, particularly important at bridgehead position especially.The settlement after construction in China's " highway subgrade design specifications " (JTG D30-2004) general highway section of regulation is less than 30cm, and the settlement after construction of end of the bridge changeover portion is less than 20cm, and the settlement after construction of end of the bridge section is less than 10cm.
Speedway is very high to foundation requirement, must reach the service purpose of " fast, safety, economy, comfortable " after building up.If the road surface is ups and downs, will affect the comfortableness of driving, hinder the quick of driving, and road surface pocket or the end of the bridge discrepancy in elevation cause the impact force of jumping car and producing, pavement roughness is further aggravated, consist of vicious circle, and then affect traffic safety and cause the tremendous economic loss.Because improper to the reinforced soft soil ground processing method of design, construction, the at present existing more speedway that has been open to traffic is because relative settlement has caused distortion disease in various degree, mainly contain following two classes: the relative settlement in (1) general highway section, mainly be because the sudden change of different sections of highway geological condition, perhaps different sections of highway has been taked the method for processing foundation that differs greatly, so that the rigidity of two adjacent highway section grounds is different, thereby cause that method for processing foundation is weak, the highway section sedimentation of features as poor geologic condition is large, and other highway section sedimentations are little, thereby produce differential settlement.(2) relative settlement of works changeover portion, mainly be because works, changeover portion and general different the causing of highway section method for processing foundation, particularly problem of bumping at bridge-head is the more common road disease of present domestic highway, and along with this problem of development of highway in China is more and more outstanding.End of the bridge occur to destroy, and seam is sunk, and faulting of slab ends has in various degree appearred in pavement damage, these faulting of slab ends are light make vehicle by the time produce and beat and impact, thereby bridge and road surface are caused additional impact load, and the driver and conductor is not felt well; The serious vehicle that passes through that then makes significantly slows down, have in addition cause driving accident, thereby affected the normal operation of highway, be subject to the extensive concern of highway circle.
Before the present invention, relative settlement method commonly used is one deck ground surface material that paves in the highway section of end of the bridge generation sedimentation behind processing vehicle jumping at bridge head of highway or the general highway section worker, makes the road surface consistent with the absolute altitude of abutment.But the shortcoming of the method is: the material unit weight that paves is larger, be applied on the embankment as load, in soft foundation, produced new subsidiary stress, cause again the compressive strain that ground is new, thereby produce new consolidation settlement, produce again in use for some time new relative settlement.If continue to adopt the method for material spreader to solve this relative settlement, the material that newly paves produces subsidiary stress as load again, causes further sedimentation, forms a vicious circle, can't stop.To this, the operation maintenance unit of speedway there is no good countermeasure, can only be passive overlay and patch work.
To fundamentally solve the problem of existing settlement of highway disease, must carry out again consolidation process to the soft soil foundation under the embankment, but because speedway is generally all higher at the embankment filled soil that produces the relative settlement highway section, if will be with the whole consolidated subsoil again behind the excavation of embankment filled soil, engineering quantity is very large, and long construction period affects vehicle pass-through.Traditional pile foundation composite foundation technology reinforcing soft ground effect is better, such as pile for prestressed pipe, CFG stake, PCC stake, cement mixing method, broken stone pile etc., but the diameter of traditional pile foundation is larger, generally all more than 50cm, the stake hole that equates with the stake footpath need to be in ground, formed during construction, if be used for reinforcing the soft foundation of the high-grade embankment of active service, original road surface and embankment structure will be destroyed, make high-grade embankment structure need again construction, increased construction costs.
Summary of the invention
Purpose of the present invention just is to overcome defects, does not affect the active service high-grade highway soft soil base sedimentation that speedway normally is open to traffic and the road pavement structural failure is very little when a kind of quick construction, construction are provided and controls again reinforcement means of pile foundation rest.
Active service high-grade highway soft soil base sedimentation control pile foundation rest of the present invention is reinforcement means again, comprises following technical step:
(1) subregion is carried out in highway section to be reinforced, generally left half range road surface is divided into left and right two zones (being defined as respectively the first subregion and the second subregion), right half range road surface also is divided into left and right two zones (being defined as respectively the 3rd subregion and the 4th subregion).
(2) the first subregion is carried out construction guard fender, the first subregion is as construction area, and all the other subregions can continue to be open to traffic.
(3) arrange bore position at construction area, boring can be arranged and is quincunx or square.The postpone of boring cloth is carried out mark on the road surface.Be to guarantee consolidation effect, make reinforcing scope maximum, the boring at the edge close pavement edge of should try one's best.
(4) hole at the bore position of arranging, boring penetrates supercrust, basic unit, embankment filled soil and soft layer successively, reaches the designing pile length degree of depth always.The long soft layer that should penetrate of stake arrives preferably soil layer of character, on the basis that settlement calculation meets the demands, also can not penetrate Soft Soil Layer.
(5) boring time, on construction ground deployed cement grout.Cement employing strength grade is 32.5 Portland cement, requires fresh in caking.General slime water gray scale is 1:1～1:1.5.Slurries begin slip casting and use and should not surpass 1 hour from preparing to, and elimination lump, sandstone etc. during use are in order to avoid blocking pipeline.
(6) drilling rod is proposed, transfer the high pressure Grout-jetting pipe in boring, Grout-jetting pipe is transferred at the bottom of the drilling hole.Grout-jetting pipe is communicated with deployed cement grout by slush pump and pressure duct.
(7) by Grout-jetting pipe inject high pressure cement grout in the boring, pull out on while rotate, stop to penetrate slurry until arrive the Soft Soil Layer end face, extract Grout-jetting pipe, thereby in ground, form high-strength cement soil.Penetrate when slurry, can penetrate slurry pressure and penetrate the slurry time by adjustment and form and straighten the footpath stake.
(8) continue in boring, to insert cement mortar, make the hole in the embankment filled soil be filled up to the road surface structare layer bottom surface by mortar.
(9) continue to fill up boring in the road surface structare layer scope with asphalt pavement material.
(10) after the construction of the first subregion is complete, construction guard fender is removed, and at other subregions construction guard fender is set respectively, repeating step (3) ~ (9) are until whole road is finished construction.
The diameter of described boring is at 8cm ~ 10cm, and high-strength cement soil stake diameter is at 60cm ~ 100cm, and bore diameter is much smaller than the diameter of formed high-strength cement soil stake.
Described Grout-jetting pipe can be arranged to multi-pore channel, and jet cement slurries, G﹠W destroy the soil body simultaneously, improves and penetrates the slurry degree of depth and pile quality.
The stake of described high-strength cement soil can be adopted and once penetrate slurry or repeatedly penetrate the slurry pile.
Described drill center is apart from equating with the design pile spacing for the treatment of the stake of reinforcing area high-strength cement soil.
Described high-strength cement soil stake reinforcing pile spacing is at 1.5 ~ 2.0m.
Described high-strength cement soil stake stake is long can adopt different length according to requirement of settlement control.
Described Grout-jetting pipe end arranges a plurality of slurry mouths of penetrating.
The stake of described high-strength cement soil destroys the higher pile foundation of intensity that solidify to form after the soil structures for high injection slurry.
The stake of described high-strength cement soil is variable at the reinforcement depth interior diameter, can form the stake of T shape, expand the stake types such as end shape stake, multistage diameter-variable pile.
Advantage of the present invention and effect are:
(1) for the speedway that is open to traffic, the job practices that the present invention adopts is with the construction of road surface subregion, and when constructing in a zone, other zones can normally be open to traffic, construction period does not need all to seal speedway, has overcome the defective that embankment heavy excavation again construction infection is open to traffic.
(2) because boring aperture is very little, the road pavement deck damage of therefore holing is less, only needs to adopt bitumen layer to repair boring after the construction and gets final product, and does not need again to do road surface structare layer again, therefore greatly reduces cost.
(3) form the larger pile body in stake footpath by high injection slurry, ground weak soil intensity is improved, and pile body has played the effect of rest embankment weight, has greatly reduced the settlement after construction of roadbed.
(4) with in the method for pavement spread asphalt surface course compare, the inventive method does not increase embankment weight, can not produce new subsidiary stress owing to the increase of embankment deadweight, has fundamentally solved existing Soft Roadbed Settlement of Highway control problem.
(5) boring is adopted the cement mortar backfill in the embankment filled soil section, and cement mortar is solidified a kind of mini pile of rear formation, has reinforced embankment filled soil, has reduced the decrement of embankment filled soil itself.Simultaneously, also have good anti-seepage effect, prevent that moisture from entering embankment.
(6) stake of high-strength cement soil has increased frictional resistance or the overhang bracket power of pile foundation sidewall, thereby has greatly improved bearing capacity of pile foundation by straightening footpath technique, has played the ground rest consolidation effect that arrives very much.
Working procedure of the present invention is simple and clear, and easy to operate, economical and efficient, implementation result are good.
Advantage of the present invention and effect also will further describe in the specific embodiment.
Description of drawings:
Fig. 1---embankment schematic cross-sectional view of the present invention
Fig. 2---the present invention construct subregion and boring plane of arrangement schematic diagram
Fig. 3---the present invention straightens footpath T shape stake schematic diagram
Fig. 4---the present invention straightens the footpath and expands end shape stake schematic diagram
Fig. 5---the present invention straightens footpath multistage diameter-variable pile schematic diagram
Among the figure: 1 is supercrust; 2 is embankment filled soil; 3 is soft foundation; 4 is bearing stratum; 5 is asphalt surface course; 6 is cement mortar; 7 is the stake of high-strength cement soil; 8 is the median strip; 9 is left width of cloth road surface; 10 is right width of cloth road surface; 11 is bore position; 12 is the first construction subregion; 13 is the second construction subregion; 14 is the 3rd construction subregion; 15 is the 4th construction subregion.
The specific embodiment
Such as Fig. 1 ~ shown in Figure 2, former Expressway Embankment is banketed (2) on soft foundation (3), because the Gravitative Loads of embankment filled soil (2) and supercrust (1), make soft foundation (3) produce larger settling amount, if do not take the measure of consolidation process, serious plant disease be will produce, turnpike driving comfortableness and safety affected.
Active service high-grade highway soft soil base sedimentation control pile foundation rest of the present invention is reinforcement means again, comprises following technical step:
1, chooses relative settlement is larger behind the worker highway section as highway section to be reinforced.Subregion is carried out in highway section to be reinforced, generally left width of cloth road surface (9) is divided into left and right two zones, be defined as respectively the first construction subregion (12) and the second construction subregion (13); Right half range road surface (10) also is divided into left and right two zones, is defined as respectively the 3rd construction subregion (14) and the 4th construction subregion (15).Median strip (8) remains unchanged.The construction subregion can be looked field condition and vehicle flowrate size, adopts other modes.For example when vehicle flowrate hour, only minute two zones are about to left width of cloth road surface (9) as first construction area, right width of cloth road surface (10) when constructing on left width of cloth road surface (9), is adopted two-way being open to traffic of right width of cloth road surface (10) as second construction area; When constructing on right width of cloth road surface (10), adopt two-way being open to traffic of left width of cloth road surface (9).When need reinforcing highway section mileage is longer, can also segment again the construction of a plurality of zones in the road travel direction.
2, first construction subregion is carried out construction guard fender, first subregion is as construction area, and all the other subregions can continue to be open to traffic.Do not affect like this being open to traffic of speedway.
3, arrange bore position (11) in construction area, bore position (11) can arrange and be quincunx or square, and bore position (11) is advisable to be covered with whole construction area, and the diameter of boring is about 10cm.Described drill center is apart from equating with the design pile spacing for the treatment of the reinforcing area stake.
4, hole at the bore position of arranging (11), boring penetrates supercrust (1), embankment filled soil (2) and soft foundation (3) successively, reaches the designing pile length degree of depth always.Designing pile length generally is advisable to arrive bearing stratum (4), also can on the basis that settlement calculation meets the demands, not arrive bearing stratum (4).Designing pile length can be not isometric, needs strict highway section in settlement Control, and the long setting of stake can be longer.Subsidiary stress at the embankment center is larger, and the comparable embankment of designing pile length edge is long.The drill hole of drilling machine rotary speed is 20r/min.
5, boring time, on construction ground deployed cement grout.Cement employing strength grade is 32.5 Portland cement, requires fresh in caking.General slime water gray scale is 1:1～1:1.5.Slurries begin slip casting and use and should not surpass 1 hour from preparing to, and elimination lump, sandstone etc. during use are in order to avoid blocking pipeline.
6, drilling rod is proposed, transfer the high pressure Grout-jetting pipe in boring, Grout-jetting pipe is transferred at the bottom of the drilling hole.Grout-jetting pipe is communicated with deployed cement grout by slush pump and pressure duct.
7, by Grout-jetting pipe to boring in the inject high pressure cement grout, cement grout should stir in last hour of spray, before inserting Grout-jetting pipe, check first the high-pressure water jet situation, whether sealing ring seals everywhere, and make water jetting at high pressure and test, can jetting slurry liquid after qualified, the pressure of water under high pressure mud or water under high pressure should be greater than 20MPa.Reach and send first water under high pressure when the design altitude spray begins when penetrating slurry mouth, send again slurries and compressed air, become first in the bottom and rotate Grout-jetting pipe limit injection 1min, spray grouting parameter and reach the rotation limit lifting of setting back, in case Grout-jetting pipe twists off, hoisting velocity is 20cm/min.Should stop when breaking down in the centre promoting and penetrating spray, in case pile body interrupts, the while checks immediately and fixes a breakdown, and the rear hole Duan Yaoyu leading portion overlap joint 10cm that begins to spray slip casting prevents that induration disconnects.Spray until arrival soft foundation (3) end face finishes, thereby in ground, form high strength cement soil stake (7).Described high strength cement soil stake (7) can adopt in the foramen primum position grout to recharge or the measure such as for the second time slip casting in case of necessity.High strength cement soil stake (7) diameter is at 60cm, 70cm, 80cm, 90cm or 100cm, and pile spacing is at 1.5m, 1.6m, 1.7m, 1.8m, 1.9m or 2.0m.
8, continue in boring, to insert cement mortar (6), make the hole in the embankment filled soil (2) be filled up to supercrust (1) bottom surface by cement mortar (6).After cement mortar (6) is solidified, form the mini pile of minor diameter at embankment filled soil (2), played equally reinforcing embankment filled soil (6), reduced the effect of embankment filled soil (6) decrement.
9, continue to fill up the interior boring of supercrust (1) scope with asphalt surface course (5) material.General Bitumen pavement of expressway (5) thickness is filled the boring end face with asphalt surface course (5) about 20cm, be combined with flexible pavement preferably, has guaranteed the comfortableness of driving.
10, after the construction of the first subregion is complete, construction guard fender is removed, this is that the first subregion just can continue to be open to traffic.Then and at other subregions construction guard fender is set respectively, repeating step 3 ~ 7 is until whole road is finished construction.
Protection scope of the present invention is not limited with the specific embodiment, but is limited by claim.
Claims (3)
1. active service high-grade highway soft soil base sedimentation is controlled again reinforcement means of pile foundation rest, may further comprise the steps:
(1) subregion is carried out in highway section to be reinforced;
(2) subregion is carried out construction guard fender, as construction area, all the other subregions continue to be open to traffic;
Characterized by further comprising following technical step:
(3) arrange that at construction area bore position, distribution of boreholes can arrange and be quincunx or square, the boring at edge is near pavement edge;
(4) hole at the bore position of arranging, boring penetrates supercrust, basic unit, embankment filled soil and soft layer successively, reaches the designing pile length degree of depth always, on the basis that settlement calculation meets the demands, also can not penetrate Soft Soil Layer;
(5) in boring time,, it is 32.5 Portland cement that deployed cement grout on construction ground, cement adopt strength grade, requires freshly in caking, and the slime water gray scale is 1:1～1:1.5; Slurries begin slip casting and use and should not surpass 1 hour from preparing to, and elimination lump, sandstone etc. during use are in order to avoid blocking pipeline;
(6) drilling rod is proposed, transfer the high pressure Grout-jetting pipe in boring, Grout-jetting pipe is transferred at the bottom of the drilling hole, and Grout-jetting pipe is communicated with deployed cement grout by slush pump and pressure duct;
(7) by Grout-jetting pipe inject high pressure cement grout in the boring, pull out on while rotate, stop to penetrate slurry until arrive the Soft Soil Layer end face, extract Grout-jetting pipe, thereby in ground, form high-strength cement soil; Penetrate when slurry, can penetrate slurry pressure and penetrate the slurry time by adjustment and form and straighten the footpath stake;
(8) continue in boring, to insert cement mortar, make the hole in the embankment filled soil be filled up to the road surface structare layer bottom surface by mortar;
(9) fill up boring in the road surface structare layer scope with asphalt pavement material;
(10) after the construction of the first subregion is complete, construction guard fender is removed, and at other subregions construction guard fender is set respectively, repeating step (3) ~ (9) are until whole road is finished construction.
2. active service high-grade highway soft soil base sedimentation according to claim 1 is controlled again reinforcement means of pile foundation rest, and the diameter that its technical characterictic is to hole is 8 to 10cm, and the stake diameter is at 60cm ~ 100cm.
3. active service high-grade highway soft soil base sedimentation according to claim 1 is controlled again reinforcement means of pile foundation rest, and its technical characterictic is that the stake of high-strength cement soil is variable at the reinforcement depth interior diameter, can form the stake type of the stake of T shape, expansion end shape stake, multistage diameter-variable pile.
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Application publication date: 20130213 |