CN103276716A - Method for stabilization and construction of transition section CFG and mattress cushion layer composite foundation - Google Patents
Method for stabilization and construction of transition section CFG and mattress cushion layer composite foundation Download PDFInfo
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- CN103276716A CN103276716A CN2013101933675A CN201310193367A CN103276716A CN 103276716 A CN103276716 A CN 103276716A CN 2013101933675 A CN2013101933675 A CN 2013101933675A CN 201310193367 A CN201310193367 A CN 201310193367A CN 103276716 A CN103276716 A CN 103276716A
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Abstract
The invention relates to a method for stabilization and construction of a transition section CFG and mattress cushion layer composite foundation. The method includes the following steps of foundation compacting and reinforcing construction, pumping pressure CFG pile construction in a spiral drilling machine pipe and mattress cushion layer construction. The method for the construction of the composite foundation improves compactness and integrality of the foundation, accelerates construction progress, reduces sedimentation deformation of a roadbed and the foundation after construction, reduces slab staggering, cracks and sedimentation generated on a road surface, improves global stability of the roadbed, reduces occurrence of bumping at bridge-head, prolongs life cycle of a road, reduces road maintenance charge and ensures safe and comfortable running on the road, meanwhile a construction technology is advanced, and the effect that a project is open to traffic ahead of time is ensured.
Description
Technical field
The present invention relates to a kind of changeover portion CFG stake and mattress layer composite foundation stabilization construction method.
Background technology
For many years, the bumping at bridge-head that roadbed bridges and culverts changeover portion settlement of subgrade causes is perplexing highway construction person always, become a kind of serious common quality defect, directly affect comfortableness and the safety of highway driving, trace it to its cause is due to the rigidity and the flexible relative settlement that causes of roadbed bridges and culverts changeover portion, therefore the ground of highway subgrade bridges and culverts changeover portion is handled and is seemed especially important, and the quality that it directly affects highway engineering construction is restricting progress and the development of following highway construction technology.
Summary of the invention
The object of the present invention is to provide a kind of changeover portion CFG stake and mattress layer composite foundation stabilization construction method, this method has guaranteed the construction quality of roadbed bridges and culverts changeover portion ground, it is poor to have reduced changeover portion roadbed settlement after construction, avoid or reduce bumping at bridge-head taking place, guarantee that highway driving is safe, steady, comfortable.
To achieve these goals, the present invention adopts to such an extent that technical scheme comprises the steps:
(1) ground compacting reinforcing construction step
At first site inspection is carried out in the job site, determine scope that roadbed the rolls reinforcement line identifier of going forward side by side, adopt heavy vibratory roller to carry out the compacting reinforcement then, carry out the test section field compaction test before rolling formal construction, first pass adopts static pressure; Shake a little less than adopting for second time; Regenerate again, carry out elevation mensuration and degree of compaction detection after per 2 times regenerations; Last receives light all over static pressure; On the depth direction of testing pits, measure degree of compaction by 25cm, 50cm, 75cm, 100cm, 125cm Stratified Sampling;
(2) long-spiral drilling machine pump pressure in pipe CFG pile driving construction step
To the construction plant carry out smooth after, setting-out after measuring, utilizing full screw earth auger to carry out elder generation's slow back piece creeps into, creep into to the designing requirement degree of depth, stop to creep into, pump cement flyash macadam-aggregate mix then, with concrete pump mixture pump is pressed into the hole at the bottom of, make in the hole and to mix liquid level and be higher than drill bit discharging opening 0.2-0.5m, the compound liquid level promotes, proposes drilling rod, displacement is continuous beats, the CFG pile is detected.
(3) mattress layer construction sequence
Paving and leveling first floor hardcore bed, empty paving thickness are 14-25cm; Described first floor hardcore bed is rolled compacting; Pave, flatten, roll first floor sand pad, virtual resurfacing thickness is 13cm; Lay the single-layer bidirectional geo-grid; Pave, flatten, roll second layer sand cushion, virtual resurfacing thickness is 13cm; Pave, flatten, roll second layer hardcore bed, virtual resurfacing thickness is 35-36cm.
As a further improvement on the present invention, the travel speed of described road roller control 4km/h, a little less than shake and regenerate according to key switch and control, a little less than when shaking engine speed be 1800～2000r/min, engine speed is 2000～2200r/min during regeneration.
As a further improvement on the present invention, described heavy vibratory roller is 32 tons of heavy vibratory rollers of YZ32D2 type.
As a further improvement on the present invention, the described compound of step (2) comprises the composition of following weight part ratio:
Cement: medium sand: rubble: flyash: Admixture is 228:770:1109:123:1.99.
As a further improvement on the present invention, described medium sand is selected from washed-out sand, and it is polycarboxylate water-reducer that described rubble adopts 5-10mm, 10-20mm, 10-30mm graded broken stone, described Admixture.
As a further improvement on the present invention, about CFG pile spacing 1.5m, be isosceles triangle and arrange.
As a further improvement on the present invention, described CFG stake is provided with the hole enlargement layer.
The beneficial effect that the present invention obtains is:
The present invention utilizes heavy vibratory roller that ground is carried out shock compaction and rolls reinforcement, guarantees highway subgrade ground compacting uniformity, eliminates or reduces the base natural subsidence distortion of worker's way of escape base, reduces and avoids pavement engineering faulting of slab ends or crack to take place; Have powerful exciting characteristics, in base table layer soil pressure reality over the ground, can also carry out reinforcement to the deep foundation that reaches deeply more than 1 meter, realize normal roller compaction construction and reinforcement roller compaction construction reasonable combination; It is controlled that vibration force and vibration frequency are adjustable, and it is stable that travel speed is adjustable, and the grinding compacting degree is even, and no work blind area and weak district are simple to operate, leakage pressure, the compacting non-uniform phenomenon of avoiding impact densifying-machine to occur.
Ground after the present invention adopts the CFG stake to reinforcement carries out consolidation process, utilize the long auger casting to stir, high-pressure pump pump pressure intensity C20～C40 cement, flyash and crushed stone compound and ground earth material are mixed into stake, form the basis of bearing capacity of foundation soil, play an important role for reducing the ground settlement after construction.Strict control speed-raising during the spiral construction guarantees that the compound liquid level exceeds drill bit bottom 0.2～0.5m in the hole, keeps the continuity of concrete perfusion, and the measure of taking to strengthen mixture pump amount, slump capping value guarantees not broken pile, not the effect of interlayer.In order to increase pile body compound intensity, the present invention selects II level flyash for use in addition, optimizes rough estimate material grating.The control of the mixture-pumping slump is at 160～200mm, and workability is good.
Mattress layer of the present invention is made up of certain thickness granular materials such as graded broken stone, medium coarse sand and geo-grid, it is seated on the CFG pile crown, interlocking interlock foundation soil, give full play to the bearing capacity of inter-pile soil, guarantee load be applied on the inter-pile soil by mattress layer and the CFG stake on, make stake soil realize bearing jointly load.
Further the heavy vibratory roller roadbed of YZ32D2 type ground rolls and the common combination of carrying construction technology of CFG stake mattress layer stake soil, can improve degree of compaction and the globality of highway subgrade ground to a great extent, accelerating construction progress, roadbed and foundation settlement distortion behind the minimizing worker, reduce the road surface and produce faulting of slab ends, crack, sedimentation, strengthen the roadbed resistance to overturning, reduced the bumping at bridge-head generation, improve the life cycle of highway, reduced the highway maintenance expense, guarantee highway safety, comfortable driving, the construction technology advanced person guarantees that engineering is open to traffic in advance simultaneously.The globality force status is significant for the differential settlement of control ground.
Description of drawings
Fig. 1 is long-spiral drilling machine pump pressure in pipe CFG pile constructing process flow chart of the present invention;
Fig. 2 is mattress layer construction flow chart of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described in more detail.
Pacifying reorganization and expansion KJ3 section with Hebei province's speedway stone is example:
(1) ground compacting reinforcing construction step
At first site inspection is carried out in the job site, stone peace reorganization and expansion KJ3 section cohesive soil with low liquid soil property is determined scope that roadbed the rolls reinforcement line identifier of going forward side by side, and adopts 32 tons of heavy vibratory rollers of YZ32D2 type to begin to roll reinforcement then, and first pass adopts static pressure; Shake a little less than adopting for second time; Carry out after regenerating for the 3rd time, the 4th time 2 times that elevation is measured and degree of compaction detects, detect the degree of compaction 91% that namely surpasses predetermined design after the 4th time, the walking but the vibratory roller straight line falls back there is no Lou pressure problem, can satisfy the needs of roadbed bridges and culverts changeover portion degree of compaction.
(2) long-spiral drilling machine pump pressure in pipe CFG pile driving construction step is seen accompanying drawing 1
1. smooth place.
2. measurement setting-out.
3. pile-forming machine perching: mobile pile-forming machine perching, with the front and back of tower machine fuselage and about vertical mark post inspection body of the tower guide rod, correction position makes center, drilling rod perpendicular alignmnet stake position, the drilling rod perpendicularity deviation is not more than 1%.
4. creep into: close the drill bit valve, mobile drilling rod to drill bit touches ground, creeps into soon after starter elder generation is slow, reduces drilling rod and rocks, and checks the deviation of boring.In pore forming process, find that drilling rod rocks or during difficult boring, can slow down drilling depth, avoid causing a hole deflection, displacement, even drilling rod, drilling tool are damaged.Note in the drilling process adjusting the stable of stake machine, forbid to tilt and dislocation; When drill bit arrival designing pile length was scheduled to absolute altitude, corresponding rig body of the tower place made eye-catching mark in stop place, power motor bottom surface, as the long foundation of construction control stake.
5. mixture-pumping
By the match ratio preparation compound of managing reply, (wherein, every cubic metre comprises 228Kg cement, 770Kg medium sand, 1109Kg rubble, 123Kg flyash, 1.99 polycarboxylate water-reducers) compound stirs must be evenly, and mixing time must not be less than 1 minute.The control slump is 160～200mm.Every machine-team should be made one group of (3) test specimen during construction.Carry out the standard curing work of record and test specimen, measure its 28 days compressive strength.
The pump output of compound with carry the drilling speed degree and adapt, carry brill while pour into, propose the control of drilling speed degree at per minute 2.0～2.5m, keep continous pouring, evenly lifting.As mud or mucky soil, carry the drilling speed degree and should suitably slow down.
Behind the drilling to completion, with concrete pump mixture pump is pressed into the hole at the bottom of, make that the compound liquid level is higher than drill bit discharging opening 0.2～0.5m rice in the hole, construction stake top mark height should exceed design stake top and be no less than 0.5m.Be to guarantee the continuity of pile body compound, should guarantee that drill bit imbeds certain depth in the compound, utilize the above compound of drill bit that impurity in the hole is pushed to ground, guarantee to clip the quality of residue pile body behind the pile crown, forbid carrying earlier and bore the back stock.
6. the continuous construction that next pile is carried out in telephone-moving of beating is shifted.Interval 1.5m between the stake is that isosceles triangle distributes.
Compound raw material use selected in this step is as follows:
A, material test
Cement: adopt the PO.42.5 Portland cement, the first final setting time of check, soundness and intensity etc. before using are as the foundation of match ratio design and construction control; Medium sand selects for use washing husky, impurity content＜5%, check mud content, clod content and basic active;
Rubble adopts 5-10mm, 10-20mm, 10-30mm graded broken stone, impurity content＜5%, check mud content, clod content, faller gill shape granule content, crush values and basic active index;
Flyash: select II level flyash for use, fineness, loss on ignition meet code requirement;
Admixture: polycarboxylate water-reducer;
B, match ratio are determined
Cement: medium sand: rubble: flyash: Admixture is 228:770:1109:123:1.99;
C, metering feed intake
Contain following component in 1 cubic metre: cement: medium sand: rubble: flyash: Admixture is 228:770:1109:123:1.99; And the CFG compound stirred; The making test specimen detects, if qualifiedly can directly enter feeding in the feeding engine.
(3) the mattress layer construction sequence is seen accompanying drawing 2
1. quality of materials inspection and control: sand, rubble are transported to on-the-spot appointed place, sand cushion adopt grating good in, coarse sand, do not contain impurity such as grass roots, rubbish, its mud content must not be greater than 5%.Hardcore bed should adopt unweathered clean gravel or rubble, and its maximum particle diameter must not be greater than 50mm, and mud content must not surpass 5%.The grain composition of hardcore bed adopts the continuous grading rubble of 5-31.5mm.
Geo-grid specification and performance meet design and code requirement through test, should neatly be deposited in the material shed (storehouse) after being transported to the building site in batches, and prevent from exposing to the sun and rain, and keep material shed aeration-drying, and exposure in sunshine for a long time.
2. measurement setting-out
Surveying party spreads out the scope of mattress layer place mat according to center, ground elevation, sideline, cross dimension setting-out both sides and center line with lime.
Measure unwrapping wire, the measure error of center line, level, skirt piles must meet regulation and stipulation and must implement two inspection systems.
| Sequence number | Interventions Requested | Allowable variation | Amount of inspection | The method of inspection |
| 1 | Center line is to Edge Distance | ±50mm | Along the vertical every 100m sampling inspection of circuit 5 places | Dipstick metering |
| 2 | Width | Be not less than design load | Along the vertical every 100m sampling inspection of circuit 5 places | Dipstick metering |
3. mattress position design layer by layer
More than the design elevation of CFG stake stake top, fill the graded broken stone sub-layer, substrate should be cleared up, flattened before the hardcore bed construction.Adopt dump truck that graded broken stone is transported to on-the-spot appointed place, loader, land leveller and artificial the cooperation flatten, and road roller rolls, compacted depth 20cm; The above single-layer bidirectional geo-grid of laying of rubble; geo-grid must not directly contact hardcore bed; should be at the thick medium coarse sand topping of geo-grid upper and lower laying 10cm, and the medium coarse sand topping will adopt the compacting of road roller static pressure, fills the thick hardcore bed of 20cm more than the medium coarse sand topping.
4. paving and leveling first floor hardcore bed
Calculate side's amount of each car rubble before the discharging, get grid with the lime line, the special messenger commands discharging.The filler smooth use loader that paves carries out just flatly, guarantees that each car material in time shakeouts, and it is flat that land leveller carries out end, and paving thickness adopts level gauge to control, and virtual resurfacing thickness is 24cm.
5. hardcore bed rolls compacting
Select 20 tons of road rollers to roll, guarantee that degree of compaction reaches designing requirement.Compacting order: in the middle of two rear flank, slow back is fast earlier earlier, shakes, shakes by force a little less than behind the first static pressure.Adopt and partly take turns overlapping rolled-on method, road roller speed is no more than 4km/h.
6. pave, flatten, roll the first floor sand cushion
Hardcore bed is laid first floor sand after the assay was approved.Calculate side's amount of each car sand before the discharging, get grid with the lime line, the special messenger commands discharging.The filler smooth use loader that paves will guarantee that each car material in time shakeouts, and it is flat to carry out end with land leveller again, and paving thickness adopts level gauge control, and virtual resurfacing thickness is 13cm.
Sand cushion 20t road roller when 13cm is thick is difficult to walking, can adopt 18t road roller static pressure, and compacting counting is one time.Manually arch camber partly strikes off to part with self-made tool then.
7. laying geo-grid
When laying, geo-grid launches perpendicular to line direction, and stretching smooth-going when paving, be close to topping, must not distortion, wrinkle, overlapping etc., be not less than material design tensile strength in the intensity that is subjected to the force direction connection place, and superimposed length is 33cm; With binding strap the adjacent two layers geo-grid is fixed, the layer of sand surfacing must not have hard ridge.After geo-grid is completed, must not move.Forbid heavy-duty machinery directly in geo-grid walking and operation.
8 pave, flatten, roll second layer sand cushion
Forbid when second layer sand paves that truck directly walks in geo-grid, earlier in the joint with loader and the artificial sand of laying, to play the effect of protection geo-grid.Adopt loader to carry out filler and pave smoothly, guarantee that each car material in time shakeouts, it is flat to carry out end with land leveller again, and paving thickness adopts level gauge to control, and virtual resurfacing thickness is 13cm.
Adopt the 18t road roller to carry out static pressure, compacting counting is one time.Manually arch camber partly strikes off to part with self-made tool then, carries out next process.
9. pave, flatten, roll second layer hardcore bed
Lay one with loader earlier and have certain thickness charging aperture.Guarantee that each car material in time shakeouts, the road that next car is laid along last car enters the place discharging.Use bulldozer slightly flat, carry out end with land leveller again and put down, paving thickness adopts level gauge control, and virtual resurfacing thickness is 36cm.
Compacting order: in the middle of two rear flank, slow back is fast earlier earlier, shakes, shakes by force a little less than behind the first static pressure.Adopt and partly to take turns rolled-on method, road roller speed is no more than 4km/h because sand cushion is difficult to compacting, so the pass that second layer hardcore bed need roll want many 1～2 time until satisfying compaction requirement.
High performance concrete match ratio design scheme is adopted in this cooperation, increase concrete density and durability, strengthen its anti-carbonization, erosion-resisting performance, its concrete unconfined compression strength is not less than 20Mpa, the Pile Composite Foundation supporting capacity is not less than 200Kpa, has effectively guaranteed the supporting capacity of composite foundation.
Interval 1.5m between the king-pile of the present invention is that isosceles triangle distributes.According to vertical support and ground ground extruding theory, effectively improve the supporting capacity of ground at the ground stabilization three-dimensional, for preventing that setting of ground has very important meaning.
The advantage that three's step is combined:
The integrated construction technology that adopts 32 tons of heavy vibratory roller impact-rollings of YZ32D2 type, long spiral casting method pump pressure CFG stake and mattress layer construction that the changeover portion ground is reinforced, reduce changeover portion ground settlement after construction, guarantee the changeover portion subgrade stability, reduced the bumping at bridge-head generation.Heavy vibratory roller impact-rolling, ground CFG stake and mattress layer construction technology are simple, strong operability.
The mattress layer that certain thickness granular materials and geo-grid are formed is set between ground CFG stake and the inter-pile soil, has given full play to the supporting capacity of inter-pile soil, realization stake soil is born load jointly, is the key technology that composite foundation is handled.
Ground implements heavy road roller compacting reinforcement technology, overcome the problem that impact densifying-machine leaks near deceleration degree of compaction deficiency pressures, the difficulty that turns around, the structure, effectively controlled the settlement after construction of roadbed ground, the assurance ground roll quality.Utilize the long spiral casting of the present invention method pump pressure CFG stake on this basis, can guarantee that pile body is firm, what the combination of mattress layer can be reinforcing road bed is stable.
The above only is the preferred embodiments of the present invention; be not limited to the present invention; for a person skilled in the art; the present invention can have change and change; within the spirit and principles in the present invention all; any modification of doing, improvement etc. all should be included within protection scope of the present invention.
Claims (6)
1. changeover portion CFG stake and mattress layer composite foundation stabilization construction method is characterized in that it comprises the steps:
(1) ground compacting reinforcing construction step
At first site inspection is carried out in the job site, determine scope that roadbed the rolls reinforcement line identifier of going forward side by side, adopt heavy vibratory roller to carry out the compacting reinforcement then, carry out the test section field compaction test before rolling formal construction, first pass adopts static pressure; Shake a little less than adopting for second time; Regenerate again, carry out elevation mensuration and degree of compaction detection after per 2 times regenerations; Last receives light all over static pressure; On the depth direction of testing pits, measure degree of compaction by 25cm, 50cm, 75cm, 100cm, 125cm Stratified Sampling;
(2) long-spiral drilling machine pump pressure in pipe CFG pile driving construction step
To the construction plant carry out smooth after, setting-out after measuring, utilizing full screw earth auger to carry out elder generation's slow back piece creeps into, creep into to the designing requirement degree of depth, stop to creep into, pump cement flyash macadam-aggregate mix then, with concrete pump mixture pump is pressed into the hole at the bottom of, make in the hole and to mix liquid level and be higher than drill bit discharging opening 0.2-0.5m, the compound liquid level promotes, proposes drilling rod, displacement is continuous beats, the CFG pile is detected;
(3) mattress layer construction sequence
Paving and leveling first floor hardcore bed, empty paving thickness are 14-25cm; Described first floor hardcore bed is rolled compacting; Pave, flatten, roll first floor sand pad, virtual resurfacing thickness is 13cm; Lay the single-layer bidirectional geo-grid; Pave, flatten, roll second layer sand cushion, virtual resurfacing thickness is 13cm; Pave, flatten, roll second layer hardcore bed, virtual resurfacing thickness is 35-36cm.
2. a kind of changeover portion CFG according to claim 1 stake and mattress layer composite foundation stabilization construction method, it is characterized in that, the travel speed control 4km/h of described road roller, a little less than shake and regenerate according to key switch and control, a little less than when shaking engine speed be 1800～2000r/min, engine speed is 2000～2200r/min during regeneration.
3. a kind of changeover portion CFG according to claim 1 stake and bed course composite foundation stabilization construction method is characterized in that, described heavy vibratory roller is 32 tons of heavy vibratory rollers of YZ32D2 type.
4. a kind of changeover portion CFG according to claim 1 stake and mattress layer composite foundation stabilization construction method is characterized in that, the described compound of step (2) comprises the composition of following weight part ratio:
Cement: medium sand: rubble: flyash: Admixture is 228:770:1109:123:1.99.
5. a kind of changeover portion CFG according to claim 4 stake and mattress layer composite foundation stabilization construction method, it is characterized in that, described medium sand is selected from washed-out sand, and it is polycarboxylate water-reducer that described rubble adopts 5-10mm, 10-20mm, 10-30mm graded broken stone, described Admixture.
6. according to each described a kind of changeover portion CFG stake of claim 3-5 and mattress layer composite foundation stabilization construction method, it is characterized in that, about CFG pile spacing 1.5m, be isosceles triangle and arrange.
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| CN107246007A (en) * | 2017-07-18 | 2017-10-13 | 北京中润宝成工程技术有限公司 | A kind of construction method CFG |
| CN108570979A (en) * | 2018-04-17 | 2018-09-25 | 中国水利水电第九工程局有限公司 | A kind of construction method for building antiseepage composite foundation on dolomite stratigraph |
| CN110512590A (en) * | 2019-07-11 | 2019-11-29 | 桂林理工大学 | It is a kind of for preventing the construction method of bridge foundation differential settlement |
| CN111980051A (en) * | 2020-07-30 | 2020-11-24 | 上海二十冶建设有限公司 | C-shaped stock ground rigid composite foundation construction method |
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| CN107246007A (en) * | 2017-07-18 | 2017-10-13 | 北京中润宝成工程技术有限公司 | A kind of construction method CFG |
| CN108570979A (en) * | 2018-04-17 | 2018-09-25 | 中国水利水电第九工程局有限公司 | A kind of construction method for building antiseepage composite foundation on dolomite stratigraph |
| CN110512590A (en) * | 2019-07-11 | 2019-11-29 | 桂林理工大学 | It is a kind of for preventing the construction method of bridge foundation differential settlement |
| CN111980051A (en) * | 2020-07-30 | 2020-11-24 | 上海二十冶建设有限公司 | C-shaped stock ground rigid composite foundation construction method |
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| CN103276716B (en) | 2016-02-10 |
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