CN103276716B - A kind of changeover portion CFG stake and mattress layer composite foundation stabilization construction method - Google Patents
A kind of changeover portion CFG stake and mattress layer composite foundation stabilization construction method Download PDFInfo
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- CN103276716B CN103276716B CN201310193367.5A CN201310193367A CN103276716B CN 103276716 B CN103276716 B CN 103276716B CN 201310193367 A CN201310193367 A CN 201310193367A CN 103276716 B CN103276716 B CN 103276716B
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Abstract
It comprises the steps: ground compacting reinforcing construction step, spiral drilling machine pump pressure in pipe CFG pile driving construction step and mattress layer construction sequence to the present invention relates to a kind of changeover portion CFG stake and mattress layer composite foundation stabilization construction method.The degree of compaction of this construction method road roadbed ground and globality, accelerating construction progress, roadbed and foundation settlement deformation after minimizing work, reduce road surface and produce faulting of slab ends, crack, sedimentation, strengthen roadbed resistance to overturning, decrease bumping at bridge-head to occur, improve the life cycle of highway, decrease highway maintenance expense, ensure highway safety, comfortable driving, construction technology is advanced simultaneously, ensures that engineering is open to traffic in advance.
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 bridge base changeover portion settlement of subgrade causes annoyings 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 caused by the rigidity of bridge base changeover portion and the flexible relative settlement caused, therefore the basement process of highway subgrade bridges and culverts changeover portion seems especially important, and it directly affects the quality of highway engineering construction, governs 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 ensure that the construction quality of bridge base changeover portion ground, decrease changeover portion post-construction settlement of subgrade poor, avoid or reduce bumping at bridge-head occurring, ensure that highway driving is safe, steady, comfortable.
To achieve these goals, the present invention adopts technical scheme comprises the steps:
(1) ground compacting reinforcing construction step
First carry out site inspection to job site, determine that scope that roadbed rolls reinforcement is gone forward side by side line identifier, then adopt heavy vibration roller to carry out compacting reinforcement, carry out test section field compaction test before rolling formal construction, first pass adopts static pressure; Adopt weak shaking second time; Regenerate again, after every 2 times regenerations, carry out High head ratio and compaction detect; Last receives light all over static pressure; Testing pits on depth direction by 25cm, 50cm, 75cm, 100cm, 125cm Stratified Sampling mensuration degree of compaction;
(2) long-spiral drilling machine pump pressure in pipe CFG pile driving construction step
To construction plant carry out smooth after, setting-out after measuring, utilize full screw earth auger carry out elder generation slow after creep into soon, creep into the designing requirement degree of depth, stopping is crept into, then pump cement flyash macadam-aggregate mix, with concrete pump by the bottom of mixture pump press-in hole, to make in hole compound liquid level higher than drill bit discharging opening 0.2-0.5m, compound liquid level promotes, propose drilling rod, displacement and continuously to beat, CFG pile is detected.
(3) mattress layer construction sequence
Paving and leveling first floor hardcore bed, empty paving thickness is 14-25cm; Compacting is rolled to described first floor hardcore bed; Pave, flatten, roll first floor sand cushion, virtual resurfacing thickness is 13cm; Lay 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 control 4km/h of described road roller, weak shake and regenerate control according to key switch, weak when shaking engine speed be 1800 ~ 2000r/min, during regeneration, engine speed is 2000 ~ 2200r/min.
As a further improvement on the present invention, described heavy vibration roller is YZ32D2 type 32 tons of heavy vibration rollers.
As a further improvement on the present invention, step (2) described compound 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 described rubble adopts 5-10mm, 10-20mm, 10-30mm graded broken stone, described Admixture is polycarboxylate water-reducer.
As a further improvement on the present invention, CFG pile spacing about 1.5m, arranges in isosceles triangle.
As a further improvement on the present invention, described CFG stake is provided with expanding layer.
The beneficial effect that the present invention obtains is:
The present invention utilizes heavy vibration roller carry out shock compaction to ground and roll reinforcement, ensures highway subgrade ground compacting uniformity, eliminates or reduces the base natural subsidence distortion of work way of escape base, reduces and avoids pavement engineering faulting of slab ends or crack to occur; There is powerful exciting feature, while base table layer soil pressure reality over the ground, reinforcement can also be carried out to the deep foundation deeply reaching more than 1 meter, realize normal roller compaction construction and reinforcement roller compaction construction reasonable combination; Vibration force and vibration frequency adjustable controlled, it is stable that travel speed is adjustable, and grinding compacting degree is even, without work blind area and weak district, simple to operate, the leakage pressure avoiding impact densifying-machine to occur, compacting non-uniform phenomenon.
The present invention adopts CFG stake to carry out consolidation process to the ground after reinforcement, long auger casting is utilized 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, minimizing ground settlement after construction is played an important role.Strictly control speed-raising during spiral construction, guarantee that in hole, compound liquid level exceeds 0.2 ~ 0.5m bottom drill bit, keep the continuity of filling concrete, take the measure strengthening mixture pump amount, slump capping value, ensure not broken pile, not the effect of interlayer.In addition in order to increase pile body compound intensity, the present invention selects II grade of flyash, optimizes rough estimate material grating.The mixture-pumping slump controls at 160 ~ 200mm, and workability is good.
Mattress layer of the present invention by certain thickness granular materials as graded broken stone, medium coarse sand and geo-grid form, it is seated on CFG pile crown, interlocking occlusion foundation soil, give full play to the bearing capacity of inter-pile soil, ensure that load is applied on inter-pile soil by mattress layer and in CFG stake, makes stake soil realize shared load.
Further YZ32D2 type heavy vibration roller roadbed ground rolls the combination jointly carrying construction technology with CFG stake mattress layer stake soil, degree of compaction and the globality of highway subgrade ground can be improved to a great extent, accelerating construction progress, roadbed and foundation settlement deformation after minimizing work, reduce road surface and produce faulting of slab ends, crack, sedimentation, strengthen roadbed resistance to overturning, decrease bumping at bridge-head to occur, improve the life cycle of highway, decrease highway maintenance expense, ensure highway safety, comfortable driving, construction technology is advanced simultaneously, ensures that engineering is open to traffic in advance.Globality force status is significant for the differential settlement controlling ground.
Accompanying drawing explanation
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.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in more detail.
For Hebei province's speedway stone peace reorganization and expansion KJ3 section:
(1) ground compacting reinforcing construction step
First carry out site inspection to job site, stone peace reorganization and expansion KJ3 section cohesive soil with low liquid soil property, determine that scope that roadbed rolls reinforcement is gone forward side by side line identifier, then adopt YZ32D2 type 32 tons of heavy vibration rollers to start to roll reinforcement, first pass adopts static pressure; Adopt weak shaking second time; Carry out High head ratio and compaction detect after regenerating for 3rd time, the 4th time 2 times, detect the degree of compaction 91% namely exceeding predetermined design after the 4th time, vibratory roller can to fall back walking by straight line, there is no Lou pressure problem, can meet the needs of bridge base changeover portion degree of compaction.
(2) long-spiral drilling machine pump pressure in pipe CFG pile driving construction step is shown in accompanying drawing 1
1. smooth location.
2. surveying and locating.
3. pile-forming machine perching: mobile pile-forming machine perching, check tower body guide rod with the front and back of tower machine fuselage with the vertical mark post of left and right, correction position, make drilling rod perpendicular alignmnet Zhuan Wei center, drilling rod perpendicularity deviation is not more than 1%.
4. creep into: close drill bit valve, mobile drilling rod touches ground to drill bit, creep into soon after starter is first slow, reduce drilling rod and rock, check the deviation of boring.In pore forming process, when finding that drilling rod rocks or difficulty is bored, can drilling depth be slowed down, avoid causing stake holes deflection, displacement, even make drilling rod, drilling tool damage.Note the stable of adjustment stake machine in drilling process, forbid to tilt and dislocation; When the predetermined absolute altitude of drill bit arrival designing pile length, in stop place, power motor bottom surface, corresponding rig tower body place makes eye-catching mark, as the foundation that construction control stake is long.
5. mixture-pumping
By the match ratio preparation compound of management reply, (wherein, every cubic metre comprises 228Kg cement, 770Kg medium sand, 1109Kg rubble, 123Kg flyash, 1.99 polycarboxylate water-reducers) compound stirs must evenly, and mixing time must not be less than 1 minute.The control slump is 160 ~ 200mm.During construction, every machine-team should make one group of (3 pieces) test specimen.Make a record the standard curing work with test specimen, measure its 28 days compressive strength.
The pump output of compound with carry drilling speed degree and adapt, brill is carried on perfusion limit, limit, carries and bores speeds control at 2.0 ~ 2.5m per minute, keep continous pouring, uniform lift.As mud or mucky soil, carrying drilling speed degree should suitably slow down.
After drilling to completion, with concrete pump by the bottom of mixture pump press-in hole, to make in hole compound liquid level higher than drill bit discharging opening 0.2 ~ 0.5m rice, construction stake top mark height should exceed design stake top and be no less than 0.5m.For ensureing the continuity of pile body compound, should ensure that drill bit imbeds certain depth in compound, utilizing the compound of more than drill bit that impurity in hole is pushed to ground, after ensureing to clip pile crown, remain the quality of pile body, forbid first carrying and bore rear stock.
6. displacement is continuous plays the construction that next pile is carried out in telephone-moving.Interval 1.5m between stake is isosceles triangle distribution.
Compound raw material use procedure selected in this step is as follows:
A, material test
Cement: adopt PO.42.5 Portland cement, inspection just final setting time, soundness and intensity etc. before using, as the foundation of mix-design and construction control; Medium sand selects washing husky, impurity content < 5%, inspection mud content, clod content and basic active;
Rubble adopts 5-10mm, 10-20mm, 10-30mm graded broken stone, impurity content < 5%, inspection mud content, clod content, flat-elongated particles content, crush values and basic active index;
Flyash: select II grade of flyash, 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
Containing, for example lower component in 1 cubic metre: cement: medium sand: rubble: flyash: Admixture is 228:770:1109:123:1.99; And CFG compound is stirred; Making test specimen detects, and can directly enter feeding in feeding engine if qualified.
(3) mattress layer construction sequence is shown in accompanying drawing 2
1. quality of materials inspection and control: sand, rubble are transported to on-the-spot appointed place, during sand cushion adopts grating good, coarse sand, not containing the 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 more than 5%.The grain composition of hardcore bed adopts the continuous grading rubble of 5-31.5mm.
Geo-grid specification and performance, through agreement with experimental design and code requirement, neatly should be deposited in material shed (storehouse) after being transported to building site in batches, prevent from exposing to the sun and rain, and keep material shed aeration-drying, and must not exposure in sunshine for a long time.
2. surveying and locating
Surveying party, according to center, ground elevation, sideline, cross dimension setting-out both sides and center line, spreads out the scope of mattress layer place mat with lime.
Surveying setting-out, the measure error of center line, level, skirt piles must meet regulation and stipulation and must implement two inspection system.
| Sequence number | Interventions Requested | Allowable variation | Amount of inspection | The method of inspection |
| 1 | Center line is to Edge Distance | ±50mm | Along circuit longitudinally every 100m sampling inspection 5 place | Dipstick metering |
| 2 | Width | Be not less than design load | Along circuit longitudinally every 100m sampling inspection 5 place | Dipstick metering |
3. mattress position design layer by layer
More than CFG stake design of pile top absolute altitude, fill graded broken stone sub-layer, substrate should be cleared up before hardcore bed construction, flatten.Adopt dump truck that graded broken stone is transported to on-the-spot appointed place, loader, land leveller and hand fit's leveling, road roller rolls, compacted depth 20cm; More than rubble lay single-layer bidirectional geo-grid; geo-grid directly must not contact hardcore bed; should at the thick medium coarse sand topping of geo-grid upper and lower laying 10cm, and medium coarse sand topping will adopt the compacting of road roller static pressure, more than medium coarse sand topping fills the thick hardcore bed of 20cm.
4. paving and leveling first floor hardcore bed
Calculate side's amount of each car rubble before discharging, get grid with lime line, special messenger commands discharging.The filler smooth use loader that paves carries out just flat, and ensure that each car material shakeouts in time, land leveller carries out end puts down, and paving thickness adopts level gauge 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: first in the middle of two rear flank, fast after first slow, weakly after first static pressure to shake, shake by force again.Adopt and partly take turns overlapping rolled-on method, road roller speed is no more than 4km/h.
6. pave, flatten, roll first floor sand cushion
Hardcore bed after the assay was approved, lays first floor sand.Calculate side's amount of each car sand before discharging, get grid with lime line, special messenger commands discharging.Filler paves smooth use loader, ensure that each car material shakeouts in time, then carries out end with land leveller and put down, and paving thickness adopts level gauge to control, and virtual resurfacing thickness is 13cm.
Sand cushion 20t road roller when 13cm is thick is difficult to walking, and can adopt 18t road roller static pressure, compacting counting is one time.Then artificial self-made tool strikes off part arch camber part.
7. lay geo-grid
Launch perpendicular to line direction when geo-grid is laid, stretching smooth-going when paving, be close to topping, must not distortion, wrinkle, overlap etc., be not less than design of material tensile strength in the intensity of Impact direction connection place, and superimposed length is 33cm; With binding strap, adjacent two layers geo-grid is fixed, layer of sand surfacing, hard ridge must not be had.After geo-grid is completed, must not move.Heavy-duty machinery is forbidden directly to be walked and operation in geo-grid.
8 to pave, flatten, roll second layer sand cushion
Forbid that truck is directly walked in geo-grid when second layer sand paves, elder generation at joint loader and manually lay sand, to play the effect of protection geo-grid.Adopt loader to carry out filler and pave smooth, ensure that each car material shakeouts in time, then carry out end with land leveller and put down, paving thickness adopts level gauge control, and virtual resurfacing thickness is 13cm.
Adopt 18t road roller to carry out static pressure, compacting counting is one time.Then artificial self-made tool strikes off part arch camber part, carries out next process.
9. pave, flatten, roll second layer hardcore bed
First lay one with loader and there is certain thickness charging aperture.Ensure that each car material shakeouts in time, next car enters place discharging along the road that last car is laid.Use bulldozer slightly put down, then with land leveller carry out end put down, paving thickness adopt level gauge control, virtual resurfacing thickness is 36cm.
Compacting order: first in the middle of two rear flank, fast after first slow, weakly after first static pressure to shake, shake by force again.Adopt and partly take turns rolled-on method, road roller speed is no more than 4km/h, because sand cushion is difficult to compacting, so second layer hardcore bed needs the pass that rolls want more than 1 ~ 2 time until meet compaction requirement.
This cooperation adopts design of mix proportion of high performance concrete scheme, increase concrete density and durability, strengthen its anti-carbonization, erosion-resisting performance, its concrete unconfined compression strength is not less than 20Mpa, Pile Composite Foundation supporting capacity is not less than 200Kpa, effectively ensure that the supporting capacity of composite foundation.
Interval 1.5m between king-pile of the present invention is isosceles triangle distribution.According to vertical supporting and ground ground extruding theory, effectively improving the supporting capacity of ground at ground stabilization three-dimensional, being of great significance for preventing setting of ground tool.
Advantage by the step of three combines:
YZ32D2 type 32 tons of heavy vibration roller impact-rollings, the pump pressure CFG stake of long spire casting method and mattress layer is adopted to construct the integrated biological pond system reinforced changeover portion ground, reduce changeover portion ground settlement after construction, ensure that changeover portion subgrade stability, decrease bumping at bridge-head and occur.Heavy vibration roller impact-rolling, ground CFG stake and mattress layer construction technology are simple, strong operability.
Arrange the mattress layer of certain thickness granular materials and geo-grid composition between ground CFG stake and inter-pile soil, given full play to the supporting capacity of inter-pile soil, realizing stake soil shared load, is a key technology of complex ground treatment.
Heavy road roller compacting Strengthening Technology implemented by ground, and overcome the problem that impact densifying-machine leaks deceleration degree of compaction deficiency near pressure, difficulty, structure, effectively control the settlement after construction of roadbed ground, what ensure ground rolls quality.Utilize long spire casting method pump pressure CFG of the present invention stake on this basis, can ensure that pile body is firm, what the combination of mattress layer can be reinforcing road bed is stable.
The foregoing is only 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; the any amendment, improvement etc. done, all should be included within protection scope of the present invention.
Claims (2)
1. changeover portion CFG stake and a mattress layer composite foundation stabilization construction method, is characterized in that it comprises the steps:
(1) ground compacting reinforcing construction step
First carry out site inspection to job site, determine that scope that roadbed rolls reinforcement is gone forward side by side line identifier, then adopt heavy vibration roller to carry out compacting reinforcement, carry out test section field compaction test before rolling formal construction, first pass adopts static pressure; Adopt weak shaking second time; Regenerate again, after every 2 times regenerations, carry out High head ratio and compaction detect; Last receives light all over static pressure; Testing pits on depth direction by 25cm, 50cm, 75cm, 100cm, 125cm Stratified Sampling mensuration degree of compaction;
(2) long-spiral drilling machine pump pressure in pipe CFG pile driving construction step
To construction plant carry out smooth after, setting-out after measuring, utilize full screw earth auger carry out elder generation slow after creep into soon, creep into the designing requirement degree of depth, stopping is crept into, then pump cement flyash macadam-aggregate mix, with concrete pump by the bottom of mixture pump press-in hole, to make in hole compound liquid level higher than drill bit discharging opening 0.2-0.5m, compound liquid level promotes, propose drilling rod, displacement and continuously to beat, CFG pile is detected;
(3) mattress layer construction sequence
Paving and leveling first floor hardcore bed, empty paving thickness is 14-25cm; Compacting is rolled to described first floor hardcore bed; Pave, flatten, roll first floor sand cushion, virtual resurfacing thickness is 13cm; Lay 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;
Wherein:
Described step (1) medium and heavy vibratory roller is YZ32D2 type 32 tons of heavy vibration rollers, the travel speed control 4km/h of road roller, weak shake and regenerate control according to key switch, weak when shaking engine speed be 1800 ~ 2000r/min, during regeneration, engine speed is 2000 ~ 2200r/min;
Described step (2) described compound comprises the composition of following weight part ratio:
Cement: medium sand: rubble: flyash: Admixture is 228:770:1109:123:1.99; Described medium sand is selected from washed-out sand, and described rubble adopts 5-10mm, 10-20mm, 10-30mm graded broken stone, described Admixture is polycarboxylate water-reducer.
2. a kind of changeover portion CFG according to claim 1 stake and mattress layer composite foundation stabilization construction method, is characterized in that, CFG pile spacing about 1.5m, arranges in isosceles triangle.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107246007B (en) * | 2017-07-18 | 2019-01-29 | 北京中润宝成工程技术有限公司 | A kind of CFG of construction method |
| 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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| CN101424079A (en) * | 2008-12-12 | 2009-05-06 | 湖南大学 | Construction method of geotechnical grid reinforcement bed course and sandstone pile bidirectional reinforced composite foundation |
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| JP5261837B2 (en) * | 2010-11-02 | 2013-08-14 | 飛島建設株式会社 | Placing a wooden pile |
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| CN101424079A (en) * | 2008-12-12 | 2009-05-06 | 湖南大学 | Construction method of geotechnical grid reinforcement bed course and sandstone pile bidirectional reinforced composite foundation |
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| CFG桩复合地基在武广客运专线中的应用;董俊;《山西建筑》;20080831;第34卷(第22期);第105页第2.1节至第106页第2.3节、第2.5节 * |
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Address after: 074000 No. 69 Shiji East Road, Gaobeidian City, Baoding, Hebei. Patentee after: Huitong Construction Group Co., Ltd Address before: 074099, No. 69 century East Road, Baoding, Hebei, Gaobeidian Patentee before: HUITONG ROAD AND BRIDGE CONSTRUCTION GROUP Co.,Ltd. |