CN107287999A - Rigid pile composite foundation united drainage consolidation reinforces highway soft soil ground construction - Google Patents
Rigid pile composite foundation united drainage consolidation reinforces highway soft soil ground construction Download PDFInfo
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- CN107287999A CN107287999A CN201710434544.2A CN201710434544A CN107287999A CN 107287999 A CN107287999 A CN 107287999A CN 201710434544 A CN201710434544 A CN 201710434544A CN 107287999 A CN107287999 A CN 107287999A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/16—Foundations formed of separate piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
- E02D3/106—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by forming sand drains containing only loose aggregates
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Architecture (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention relates to road foundation construction engineering method, specifically rigid pile composite foundation united drainage consolidation reinforces highway soft soil ground construction, construction procedure：Lay working cushion layer；Using sand wick as vertical drainage body, vibration sinking tube transfers sand wick, and empty well section wants feed supplement during shaking tube drawing, tube drawing；Rigid pile is set, concrete, which is filled, by way of vibration sinking tube carries out vibrations tube drawing after set, pipe-pulling speed is less than 1.2 ms/min, and tube drawing is unable to anti-plug during vibration pipe-drawing；Pile cover is poured, in the working cushion layer constructed or is banketed, pile cover poured using the method for anti-excavation construction；Roadbed is backfilled, and sedimentation version is set in capital and intercolumniation, and filled height is less than five meters and flattened using vibrations press.Highway soft soil ground construction is reinforced compared with pile dike, rigid pile composite foundation construction using rigid pile joint ground united drainage consolidation, respectively saving construction cost 40 percent and 46 percent.
Description
Technical field
The present invention relates to the construction method of highway foundation, specifically rigid pile composite foundation united drainage consolidation is reinforced
Highway soft soil ground work engineering method.
Background technology
The China's Coastal Areas network of waterways is gathered, traffic is flourishing, and bridges and culverts is numerous in highway and free height, causes embankment special
It is that depth of fill near bridges and culverts is usually more than five meters.Allow the duration constantly shorten, allow settlement after construction it is ever-reduced become
Under gesture, concrete-pile（Pile for prestressed pipe, CFG a rigid pile）Composite foundation is gradually applied in Expressway Ground Improvement.Pin
, soil compaction effect high to concrete composite foundation cost substantially, part concrete composite foundation unstability or settlement after construction is bigger than normal etc. lacks
Point, the water content of soft soil roadbed adjacency is than larger under normal circumstances, and the space between grogs is also that than larger, first is
Because weak soil is made up of the higher grogs of water content, crushing resistance is not fine, and mobility is stronger, and intensity is not
It is high.Weak soil says that simply some processes of this section are weak soils to a certain extent, and by the passage of some processes, weak soil can sink,
Soft Soil Layer can be thinning after sinking, and intensity can also increase, but road surface will and then sink, and can cause the steady problem of Uneven road
Occur.So soft soil roadbed do not interfere with construction period, but if not disposing soft soil roadbed is understood to construction quality
On cause very big influence.The infringement of soft soil foundation is very big, if it is soft soil roadbed it is mishandling can be largely
The service life of subcrust is had influence on, and then danger is brought to everybody lives and properties.On road surface by macrocyclic kneading
Afterwards, subgrade soils can be kneaded to Soft Soil Layer adjacency, it is impossible to reach the demand of road defined.In heavy showers or rainfall in succession
Afterwards, the side slope of road can receive damage, and the stability of side slope accordingly will be not as in one's early years.Road engineering will build high-quality
Highway, just have to ensure that the intensity and service life of roadbed, not so will trigger many social conditions.The weak soil of normality itself
Intensity it is relatively low, once by the pressure of external force, necessarily occur deformation and sink etc. situation.
The content of the invention
It is an object of the invention to shortening the big weak soil of the thickness construction of the highway cycle, the anti-settling energy of highway foundation is reinforced
Power, rigid pile composite foundation united drainage consolidation can reduce the soil compaction ability of rigid pile, accelerate the native discharging consolidation of intercolumniation, improve
The shear strength of intercolumniation soil, can increase intercolumniation reduction construction cost.
The present invention is achieved through the following technical solutions：Rigid pile composite foundation united drainage consolidation reinforces highway soft soil ground
Construction comprises the following steps：
（1）Roadbed bed course：Course is transported, is layered on soft soil foundation layer, road roller is rolled；
（2）Construction vertical drainage body：Bag sand well is transferred using the method for immersed tube, carries out filling husky by filling husky machine；
（3）Set rigid pile：Banketed on drainage blanket 0.5 meter, pass through vibration sinking tube to the side of projected depth placing concrete
Formula, builds rigid pile；
（4）Pour pile cover：Excavation foundation trench is returned in construction working bed course or in banketing, pile crown is handled, pile cover template is installed,
Casting concrete；
（5）Roadbed filling：Surface settlement plate is set between section road center line and slope, filler is transported, road bed is first rough smooth,
Then it is fine smooth, finally tamped.
Roadbed bed course in preferably described step 1 is divided into sand mat of subgrade, working cushion layer, and bed course gross thickness is at 1.5 meters
To between 2 meters, sand mat of subgrade is that one layer of layer of sand is set on embankment bottom ground upper berth, and effect is to increase a row in weak soil top surface
The water surface, during banketing, load gradually increases, and the water for promoting soft foundation discharge fixing to ooze out is drained from sand bedding course,
To ensure the unobstructed draining of sand bedding course energy, the general thickness of sand bedding course is 0.5-1.0m.In order to ensure that the infiltration of sand bedding course is acted on, protect
The stabilization of roadbed is held, drainage blanket is course from the good grain masonry of vapor-permeable type, and one layer of cohesive soil is filled out on sand bedding course and is sealed
Water does not allow water to return roadbed, and soft soil foundation soil layer is unstable, and bed course also directly influences the sedimentation of road surface pad, in order to ensure weak soil
The normal operation of foundation construction equipment, the working cushion layer of 1 meter to 2 meters of laying on drainage blanket, when bed course total height is more than day
, it is necessary to lay reinforcement material in the middle part of bed course bottom or bed course after right height of level half, prevent softness ground stress uneven
And collapse, bed course is using machinery point heap laid process.
Construction vertical drainage body scheme in preferably described step 2 fills sand, platform scale inspection for sand wick using sand drain is filled
Bagged sand well irrigation sand amount is tested, in order to ensure to fill chiltern amount and speed of application, in the case that mixing building stones can pour into husky machine, is filled
Sand machine height must not be less than 0.5 to 1 times of well sand length, and sand material inside sand drain can be caused by filling the husky machine sand excessive velocities of the filling more than one meter
Density unevenness, influence the quality of sand drain, in husky well machine tube drawing, lower husky well sling using vibration hammer and examines the strong of sand drain bag
Degree, sand drain window of tube should set pulley or slide plate to prevent from scratching sand wick, and the speed of sand pile tube drawing arrives for 0.6 m/min
1.0 m/min, when pipe-pulling speed is in the case of 0.6 m/min, the too slow concrete coagulation of pipe-pulling speed increases friction
Power, broken pile is easily caused in soft soil foundation pipe-pulling speed at 1.0 ms/min.
Driven cast-in-place pile builds rigidity by vibration sinking tube to projected depth placing concrete in preferably described step 3
Stake, before construction, determines construction depth, mixture-pumping, rubble is maximum straight along roadbed longitudinal direction every 20 meters of left, center, rights in roadbed
Footpath is 20 millimeters, and the too conference of more than 20 millimeters building stones reduces the intensity of rigid pile, and the slump directly reacts the water-retaining property for coagulating soil, stream
Dynamic property and poly- property is sticked, the slump shows that concrete flowability is poor, water-retaining property is low when being less than 16 centimetres, when the slump is more than 20 centimetres
The mobility of rigid pile is excessive, and it is low to stick poly- property, so the slump is preferably 16 centimetres to 20 centimetres, immersed tube after concrete is filled,
In order that rigid pile building stones produce gap with immersed tube, increase building stones density, it is necessary to shake immersed tube 10 seconds to 15 seconds, immersed tube is extracted
Speed is 0.6 m/min to 1.0 ms/min, and the excessively slow concrete coagulation of pipe-pulling speed can increase the friction of rigid pile and immersed tube
, easily there is broken pile in power, and pipe-pulling speed is too fast, and a part of concrete can be attached on immersed tube, can also be easily caused broken pile, rigidity
Stake is discontented to be needed to add concrete.
The forced mixer that preferably described step 4 pile cover concrete is controlled using self-measuring device is stirred,
Shaken using vibrating spear, after pile cover is dried, to pile cover hole backfilled, it is smooth.
Preferably described step 5 roadbed backfill, monitoring section, each monitoring section road center line, slope are designed in roadbed backfill
Shoulder sets surface settlement plate, and capital and intercolumniation are provided with surface settlement plate；It is more than in pile cover on the roadbed of twice of cap clear spacing and lays
The larger filler of angle of friction, protects vertical drainage body not to be destroyed, and 50 centimetres are filled using cohesive soil on drainpipe bed course；
Filled height uses impact-rolling technique when being more than five meters, roadbed is more consolidated.
The present invention compared with prior art, has the advantage that and had the beneficial effect that：Rigid pile composite foundation and discharging consolidation
Joint use in conjunction, displacement hull can reduce the soil compaction effect of rigid pile, accelerate rigid inter-pile soil discharging consolidation, improve inter-pile soil
Shearing strength, reduce settlement after construction, can reduce highway bridgehead vehicle jump phenomenon for society, improve the comfortable of highway driving
Type；Rigid pile composite foundation is combined use in conjunction with discharging consolidation and distinguished relative to pile dike, rigid composite foundation saving construction cost
For 40 percent, 46 percent, and overall short time limit.
Brief description of the drawings
Fig. 1 is construction flow chart of the invention.
Embodiment
The present invention is described in further detail with reference to embodiment, but the implementation of the present invention is not limited to this,
Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and customary means, various replace is made
Change and change, all should be included within the scope of the invention.
Embodiment 1:
Highway soft soil ground work engineering method, including roadbed pad are reinforced present embodiment discloses rigid pile composite foundation united drainage consolidation
The construction of layer, vertical drainage body is set on bed course, rigid pile is irrigated using vibration sinking tube mode, passes through the anti-construction party excavated
Formula pours pile cover, last embankment backfill, the invention primarily to solving to require construction work for the weak soil that thickness is big, property is poor
Phase is short, the high highway foundation reinforcement means of settlement request, or can not meet the requirement of roadbed safety and stability using draining concretion method
Highway Soft Subgrade Consolidation engineering, be also applied for railway, the foundation stabilization of dykes and dams similar engineering.
Specific implementation method：
（1）Unwrapping wire is measured to bed course first, when surface water can not be excluded, it is necessary to lay draining foundation and work ground,
First place mat drainage blanket, by dump truck transport laying material, the medium coarse sand of laying material mainly using good permeability as material,
Shared using bull-dozer and push away heap method, bull-dozer is bulldozed, and road roller is rolled, then place mat work ground, when laying ground is big
In after subsoil Slab culvert percent 50, it is necessary to lay reinforcement material in the middle part of bed course bottom or bed course.
（2）Construction vertical drainage body, surveying setting-out avoids the rigid pile constructed, and is positioned with sand drain machine, vibration sinking tube
To projected depth, immersed tube window is provided with slide plate, prevents the sand wick that comes down, bag sand well is put into immersed tube, using vibrations
Mode tube drawing, lower sand drain is sling to examine sand drain bag intensity, improve sand drain compactness, in time during sand drain tube drawing using vibration hammer
In empty well section supplementary irrigation sand material, the speed of tube drawing is at 0.6 m/min to 1.0 ms/min, when pipe-pulling speed is at 0.6 m/min
In the case of, the too slow concrete coagulation of pipe-pulling speed, increasing friction force influences construction speed, soft soil foundation pipe-pulling speed is 1.0
Sand drain structural failure is easily caused more than m/min.Patch installing aside when sand wick rewinds length more than 0.5 meter is necessary
When sand drain pipe in reduction of pouring water rewind phenomenon, then sand drain is embedded in drainage blanket, the mud taken out of on timely bed course bed course,
Reduce the pollution to drainage blanket.
（3）Weak soil highway subgrade sets rigid pile and fills the non-soil compaction construction technology construction of stake using immersed tube, and surveying setting-out is avoided
The vertical drainage body constructed, the forced mixer that the mixing building stones of bored concrete pile are controlled using self-measuring device is stirred, pump
Compound is sent, rubble maximum gauge is 20 millimeters, and the too conference of more than 20 millimeters building stones reduces the intensity of rigid pile, and the slump is direct
The water-retaining property of soil is coagulated in reaction, mobility and sticks poly- property, and the slump shows that concrete flowability is poor, water-retaining property when being less than 16 centimetres
Low, the mobility of rigid pile is excessive when the slump is more than 20 centimetres, and glutinous poly- property is low, so the slump is preferably 16 centimetres to 20 lis
Rice, immersed tube after concrete is filled, in order that rigid pile building stones and immersed tube produce gap, increase building stones density, it is necessary to shake it is heavy
Pipe 10 seconds to 15 seconds, the speed for extracting immersed tube is 0.6 m/min to 1.0 ms/min, the excessively slow concrete coagulation meeting of pipe-pulling speed
Increase rigid pile and the frictional force of immersed tube, broken pile easily occur, pipe-pulling speed is too fast, a part of concrete can be attached to immersed tube
On, broken pile can be also easily caused, rigid pile is discontented to be needed to add concrete.
（4）When soft soil roadbed rigid pile progress pile cover is poured, banketed to reduce destruction, guarantee of the subsequent construction to pile cover
Roll weight, pile cover is in the working cushion layer constructed or bankets, and using the anti-form of construction work excavated pours pile cover, pile cover hole
Groove will backfill closely knit, smooth, and the junction of rigid pile and pile cover will be cleaned up, and the concrete of pile cover uses self-measuring device
The forced mixer stirring of control, is vibrated using vibrating spear, after pile cover is air-dried, can carry out roadbed backfill, it is to avoid pile cover
Fracture.
(5) need to set monitoring section in roadbed backfilling process, each monitoring section road center line, slope shoulder set surface settlement
Version, capital and intercolumniation should also bury surface settlement plate, and on monitoring end face road, center line intercolumniation Soft Soil Layer sets sensor for pore water pressure, toe
Inclinometer pipe is set in two meters, needs 50 centimeters on drainage blanket to be filled with cohesive soil before embankment construction, 2 times of pile cover
Filler in above pile cover clear spacing using internal friction angle more than 30, when depth of fill is less than five meters, roadbed filling is first used and bulldozed
Machine is bulldozed, then is flattened with the vibrated roller of large-tonnage, and filled height uses impact-rolling technique, Automobile Transportation when being more than five meters
Fill loose laying depth and be not more than 30 centimetres, water conservancy hydraulic reclamation thickness is less than 50 centimetres, and the load-carrying of embankment equivalent and excess load-carrying stage divide
Thickness degree is less than 30 centimetres.Thick 19 meters to weak soil, embankment is high 7 meters, wide 55 meters, the long 100 meters embankment of embankment, in duration difference
In the case that number of days is no more than 15 days, highway soft soil ground construction is reinforced using rigid pile composite foundation united drainage consolidation
Compared with pile dike, rigid pile composite foundation construction, difference saving construction cost 40 percent and 46 percent.
Claims (6)
1. rigid pile composite foundation united drainage consolidation reinforces highway soft soil ground construction, it is characterised in that：Including following
Step：
（1）Roadbed bed course：Course is transported, is layered on soft soil foundation layer, road roller is rolled；
（2）Vertical drainage body：Bag sand well is transferred using the method for immersed tube, carries out filling husky by filling husky machine；
（3）Set rigid pile：Rigid pile is built by way of vibration sinking tube to projected depth placing concrete；
（4）Pour pile cover：Excavation foundation trench is returned in construction working bed course or in banketing, pile crown is handled, pile cover template is installed,
Casting concrete；
（5）Roadbed filling：Surface settlement plate is set between section road center line and slope, filler is transported, road bed is first rough smooth,
Then it is fine smooth, road roller compacting.
2. reinforce highway soft soil ground construction, institute according to the rigid pile composite foundation united drainage consolidation described in claim 1
State step（1）Characterized in that, bed course includes working cushion layer, sand mat of subgrade, sand mat of subgrade, sand mat of subgrade and work pads
Thickness degree is between 1.5 meters to 2 meters, and bed course bottom needs to lay and added when bed course is highly more than 0.5 times of subsoil depth of fill
Muscle material, course is used as from the grain stone material of good permeability.
3. the rigid pile composite foundation united drainage consolidation described in claim 1 reinforces highway soft soil ground construction, described
Step（2）Husky machine height is filled in vertical drainage body between 0.5 times to 1 times husky well length, the sand drain window of tube of sand drain is delivered
Pulley should be provided with, pulley protect sand wick not by sliding broken, the speed that husky well casing vibration is extracted is 0.6 m/min to 1.0 meters/
Minute.
4. reinforce highway soft soil ground construction, institute according to the rigid pile composite foundation united drainage consolidation described in claim 1
State step（3）Rigid pile is built by vibration sinking tube to projected depth placing concrete, before construction, along roadbed longitudinal direction every 20 meters
Construction depth is determined in the left, center, right of roadbed, immersed tube is after concrete is filled, vibrations immersed tube 10 seconds to 15 seconds, and immersed tube is extracted in vibration
Speed be 0.6 m/min to 1.0 ms/min, immersed tube is unable to anti-plug during vibration pipe-drawing.
5. the rigid pile composite foundation united drainage consolidation described in claim 1 reinforces highway soft soil ground construction, described
Step（4）The forced mixer that middle pile cover concrete is controlled using self-measuring device is stirred, and is shaken using vibrating spear,
After the completion of pile cover, pile cover hole backfilled, it is smooth.
6. reinforce highway soft soil ground construction, institute according to the rigid pile composite foundation united drainage consolidation described in claim 1
State step（5）The concrete scheme of middle roadbed backfill is as follows：
（5.1）Design monitoring section in roadbed backfill, each monitoring section road center line, slope shoulder set surface settlement plate, capital and
Intercolumniation also is provided with surface settlement plate；
（5.2）Pile cover is more than the filler that laying angle of friction on the roadbed of twice of cap clear spacing is more than 30 degree, on drainpipe bed course
Filled using cohesive soil in 50 centimetres of face；
（5.3）Filled height is filled when being more than 5 meters using impact-rolling technique to roadbed, and roadbed is highly less than 5 meters of uses
Vibrated roller is rolled.
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| CN201710434544.2A CN107287999A (en) | 2017-06-09 | 2017-06-09 | Rigid pile composite foundation united drainage consolidation reinforces highway soft soil ground construction |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723072A (en) * | 2018-12-10 | 2019-05-07 | 温州大学瓯江学院 | A kind of foundation structure preventing soft soil base sedimentation and its method |
| CN109900564A (en) * | 2019-03-25 | 2019-06-18 | 中国电建集团华东勘测设计研究院有限公司 | Inter-laminar dislocation band of growing up friction angle measuring method |
| CN110055845A (en) * | 2019-05-15 | 2019-07-26 | 浙江沧海建设有限公司 | A kind of construction method that highway bridge and culvert two sides are soft soil roadbed |
| CN111794032A (en) * | 2020-07-13 | 2020-10-20 | 王超 | Construction method for settlement-preventing highway subgrade in soft soil area |
| CN111962497A (en) * | 2020-08-14 | 2020-11-20 | 福建省欣硕景观绿化有限公司 | Foundation reinforcing structure and reinforcing structure installation method |
| CN112176804A (en) * | 2020-10-12 | 2021-01-05 | 东南大学 | Anti-settlement water retention roadbed structure in water-rich soft soil area and design method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723072A (en) * | 2018-12-10 | 2019-05-07 | 温州大学瓯江学院 | A kind of foundation structure preventing soft soil base sedimentation and its method |
| CN109900564A (en) * | 2019-03-25 | 2019-06-18 | 中国电建集团华东勘测设计研究院有限公司 | Inter-laminar dislocation band of growing up friction angle measuring method |
| CN109900564B (en) * | 2019-03-25 | 2021-09-28 | 中国电建集团华东勘测设计研究院有限公司 | Method for measuring friction angle of large interlaminar dislocation belt |
| CN110055845A (en) * | 2019-05-15 | 2019-07-26 | 浙江沧海建设有限公司 | A kind of construction method that highway bridge and culvert two sides are soft soil roadbed |
| CN111794032A (en) * | 2020-07-13 | 2020-10-20 | 王超 | Construction method for settlement-preventing highway subgrade in soft soil area |
| CN111794032B (en) * | 2020-07-13 | 2022-05-24 | 湖北交投建设集团有限公司 | Construction method for settlement-preventing highway subgrade in soft soil area |
| CN111962497A (en) * | 2020-08-14 | 2020-11-20 | 福建省欣硕景观绿化有限公司 | Foundation reinforcing structure and reinforcing structure installation method |
| CN111962497B (en) * | 2020-08-14 | 2021-07-27 | 福建省欣硕景观绿化有限公司 | Foundation reinforcing structure and reinforcing structure installation method |
| CN112176804A (en) * | 2020-10-12 | 2021-01-05 | 东南大学 | Anti-settlement water retention roadbed structure in water-rich soft soil area and design method |
| CN112176804B (en) * | 2020-10-12 | 2022-03-01 | 东南大学 | Anti-settlement water retention roadbed structure in water-rich soft soil area and design method |
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Application publication date: 20171024 |