CN101761072B - Construction process for bored pile close to flood wall through riprap layer - Google Patents
Construction process for bored pile close to flood wall through riprap layer Download PDFInfo
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- CN101761072B CN101761072B CN 200810044178 CN200810044178A CN101761072B CN 101761072 B CN101761072 B CN 101761072B CN 200810044178 CN200810044178 CN 200810044178 CN 200810044178 A CN200810044178 A CN 200810044178A CN 101761072 B CN101761072 B CN 101761072B
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Abstract
The invention relates to a construction process for a bored pile close to a flood wall through a riprap layer. A bent frame is lapped close to the side of a flood wall and erected above the flood wall to form a drilling platform, and a pile driver is placed on the bent frame for construction; and the concrete process flow is as follows: firstly, obstacle clearing and outer shielding canister burying; secondly, inner shielding canister burying; thirdly, drilling machine replacing for continuous drilling; fourthly, hole cleaning, fifthly, reinforcement cage hanging; sixthly, underwater concreting; and lastly, inner shielding canister pulling. The construction process solves the problems of obstacle clearing, hole forming and stability of hole wall of the bored pile in the thick riprap layer by combining the inner sleeve and the outer sleeve; the geotextile is arranged on the inner side of the sleeve of the full-rotating drilling machine for recycling the outer shielding canister, therefore, the construction process has a certain economical efficiency, and the underwater concreting is carried out when the Huangpu River is in high water level to ensure the slurry return for the bored pile close to the flood wall by the Huangpu River and to ensure the smooth construction of the pile foundation and the quality of the pile body of the bored pile close to the flood wall by the Huangpu River.
Description
Technical field
The present invention relates to a kind of construction process for bored pile, especially a kind of bored pile pile foundation construction process that passes through riprap layer near flood-control wall, pore-forming.
Background technology
Existing object of construction production reaches the east gate road in the south North gets Xinkai River, west depends on the East Zhongshan Road, and Huangpu River is faced in east, the long 630m of water front, floor space 30400m
2The floating wharf of going on board of water balcony and visit Pujiang is near Huangpu River, and the land pile foundation of water balcony is in existing flood-control wall inboard, and stake is Φ 800mm directly, effective length 39m, and part pile foundation and existing flood-control wall clear distance be 10cm only, and need pass through the pierre-perdue of flood-control wall.This project is (in about 10m) during lateral extent Huangpu River closer distance near a river, and groundwater level and Huangpu River water level have close hydraulic connection.
For the safety that guarantees existing flood-control wall and with pile foundation construction near flood-control wall, need a kind of construction process for bored pile near flood wall through riprap layer
Summary of the invention
The present invention will provide a kind of construction process for bored pile near flood wall through riprap layer, and this technology can solve bored pile remove obstacles pore-forming, the stable technical problem of hole wall in thick riprap layer.
For achieving the above object, technical scheme of the present invention is: a kind of construction process for bored pile near flood wall through riprap layer, setting up framed bent by the flood-control wall side, and framed bent is maked somebody a mere figurehead above flood-control wall, form a drilling platform, the stake machine is placed on the framed bent constructs; The concrete technological process of construction is:
(1) removes obstacles and outer casing is buried underground
1) adopt Full Rotary all casing drill to remove obstacles: the soil body in the pile foundation construction influence basin all to be cut, adopt supporting bull grab bucket to abolish piece stone and reach not clear obstruction and clear sleeve diameter 1200mm;
2) bury the outer casing of φ 1200mm underground, then, adopt to dash and grab rig percussion drilling about underground 10～12m that removes obstacles;
(2) interior casing is buried underground
1) the interior casing of processing φ 900mm is 5, wall thickness 16mm, length 10m; The processing diameter is that the geotextiles sheath of 1200mm is some, length 12～13m;
2) be enclosed within the casing outside in the φ 900mm with φ 1200mm geotextiles, end opening is stuck with U shaped steel muscle; (seeing accompanying drawing 1 for details)
3) the grip interior casing of geotextiles is put into outer casing, adopts the pile cover (seeing accompanying drawing 2 for details) and the interior casing in outer casing location of processing;
4) with vibrating hammer interior casing is squeezed into about 1m in the soil body, casing can not be shifted in guaranteeing;
5) gap yellow sand backfill between interior casing and the outer casing;
6) outer casing is extracted with the 100t crane, and interior casing and geotextiles are stayed in the hole;
(3) change auger and continue drilling and forming hole
When creeping into, adopt the direct circulation mode to carry out mud circulation, in the particulate boring mud sedimentation basin, adopt slush pump to carry premium mud to boring, keep mud circulation;
(4) clear hole
After boring is finished, after measurement inspection reaches design elevation, carry out hole clearly, once clear hole utilizes the slush pump of the direct circulation system of boring to continue slag absorbing 5～15 minutes, and it is clean that hole subdrilling slag is removed, after finish in once clear hole, remove drilling rod, drill bit rapidly, transfer conduit after laying reinforcing cage, carry out the clear hole of secondary subsequently, sediment and mud property at the bottom of the measured hole;
(5) install reinforcing cage
(6) underwater concrete perfusion
(7) interior casing rises and pulls out
Rise immediately after concrete spouting finishes and pull out interior casing, geotextiles is stayed in the hole, prevents that concrete runs off interior casing recycling.
The making of used steel casing:
Steel casing internal diameter is drilled pile diameter+100mm, and steel casing top mark height exceeds water level; Steel casing perpendicularity deviation is no more than 1/200, and ovality is not more than 2cm, and the groove double welding is adopted in welding, and all weld seams are continuous, guarantees water-tightly, and the steel casing is buried the casing center underground must not be greater than 30mm with a centrical deviation.
Used mud
(1) control mud liquid level
The liquid level absolute altitude is safeguarded the safety of bottom layer of sand to guarantee enough head pressures in the control hole;
(2) control mud balance
Mud balance is controlled at 1.2.
(3) control mud viscosity
Adopt polyacrylamide to improve viscosity, mud viscosity: general stratum 18～22S, the loose stratum 19～28S that easily collapses.
(4) control mud PH value
Before mud uses, the pH value of mud is measured.
The invention has the beneficial effects as follows: the mode of construction technology of the present invention by inside and outside casing combination solved bored pile remove obstacles pore-forming, hole wall stable problem in thick riprap layer; The measure that full circle swinging rig sleeve inboard is provided with geotextiles recycles outer casing and has certain economy and carry out underwater concrete when Huangpu River high water mark and pour into the slurry that returns of guaranteeing bored pile near a river, and guaranteed that Huangpu is along the river near the smooth construction and the pile quality of the bored pile pile foundation of flood-control wall.
Description of drawings
Fig. 1 is the geotextiles arrangement diagram;
Fig. 2 is an inside and outside casing location pile cover schematic diagram.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Construction process for bored pile near flood wall through riprap layer of the present invention is being set up framed bent by the flood-control wall side, and framed bent is maked somebody a mere figurehead above flood-control wall, forms a drilling platform, and the stake machine is placed on the framed bent constructs; The concrete technological process of construction is:
(1) removes obstacles and outer casing is buried underground
1) adopts Full Rotary all casing drill to remove obstacles, the soil body in the pile foundation construction influence basin is all cut, adopt supporting bull grab bucket to abolish piece stone and reach not clear obstruction and clear sleeve 2 diameter 1200mm;
2) bury the outer casing 2 of φ 1200mm underground, then, adopt to dash and grab rig percussion drilling about underground 10～12m that removes obstacles;
(2) interior casing is buried underground
1) the interior casing of processing φ 900mm is 1 five, wall thickness 16mm, length 10m; The processing diameter is that the geotextiles sheath 3 of 1200mm is some, length 12～13m;
2) be enclosed within casing 1 outside in the φ 900mm with φ 1200mm geotextiles, end opening is stuck with U shaped steel muscle 4; (see figure 1)
3) the grip interior casing 1 of geotextiles is put into outer casing 2, adopts pile cover 5 (see figure 2)s and the interior casing 1 in outer casing 2 location of processing;
4) with vibrating hammer interior casing is squeezed into about 1m in the soil body, casing can not be shifted in guaranteeing;
5) gap yellow sand backfill between interior casing 1 and the outer casing 2;
6) outer casing is extracted with the 100t crane, and interior casing and geotextiles are stayed in the hole;
(3) change auger and continue drilling and forming hole
When creeping into, adopt the direct circulation mode to carry out mud circulation, in the particulate boring mud sedimentation basin, adopt slush pump to carry premium mud to boring, keep mud circulation.
Drilled pile all adopts normal circulation technology.During the bored pile construction, take following measure control differential water pressures: the one, adjust mud balance, the 2nd, adjust mud face height in the hole.
(4) clear hole
After boring is finished, after measurement inspection reaches design elevation, carry out hole clearly, once clear hole utilizes the slush pump of the direct circulation system of boring to continue slag absorbing about 5～15 minutes, and it is clean that hole subdrilling slag is removed, after finish in once clear hole, remove drilling rod, drill bit rapidly, transfer conduit after laying reinforcing cage, carry out the clear hole of secondary subsequently, sediment and mud property at the bottom of the measured hole;
(5) install reinforcing cage
(6) underwater concrete perfusion
(7) interior casing rises and pulls out
Rise immediately after concrete spouting finishes and pull out interior casing, geotextiles is stayed in the hole, prevents that concrete runs off interior casing recycling.
Technical quality control main points of the present invention:
(1) inside and outside casing accurate positioning is guaranteed to remove obstacles and become hole perpendicularity.
(2) casing end opening in geotextiles is stuck in U shaped steel muscle inserts undisturbed soil 1m, and geotextiles is stayed in the hole in the process of pulling out on the casing in guaranteeing, guarantees that concrete does not run off.
(3) backfill of trying one's best of inside and outside casing gap is closely knit, reduces the concrete fullness coefficient.
(4) the interior diving of the about 10m scope of side is close with Huangpu River hydraulic connection near a river, strengthens mud balance in the pore forming process and guarantees retaining wall, adopts during Huangpu River low tide newly to mix to make in the mud injection hole and guarantees mud circulation.The underwater concrete perfusion is generally carried out when Huangpu River high water mark, guarantees to return slurry.
The steel casing is made
Steel casing internal diameter is drilled pile diameter+100mm, and steel casing top mark height should exceed water level.The steel casing is processed at the steel work processing space.Steel casing processing criterion, perpendicularity deviation is no more than 1/200.Ovality is not more than 2cm, and the groove double welding is adopted in welding, and all weld seams are continuous, and are water-tight to guarantee.The steel casing is buried underground should be accurately, stable, the casing center must not be greater than 30mm with the centrical deviation of stake.Because this engineering underground obstacle is more, other processes the long casing of 5m～10m with standby.
Mud
Adopt premium mud, the direct circulation mode is carried out mud circulation.The mud control measure are as follows:
(1) control mud liquid level
Owing to there is layer of sand, soil body lateral pressure collapses for preventing or reducing layer of sand, and the liquid level absolute altitude is safeguarded the safety of bottom layer of sand to guarantee enough head pressures in the control hole.
(2) control mud balance
The excessive rig pore-forming of mud balance resistance is big, and the mud fluid loss is big, and mud balance is controlled at about 1.2.
(3) control mud viscosity
Should suitably improve mud viscosity, suitably adopt macromolecular compound (polyacrylamide) to improve viscosity, to stop the hydration swelling and loose the collapsing of Different Strata, viscosity can not be excessive simultaneously, and viscosity is too high, pump pressure is raise, discharge capacity significantly reduces, and drilling speed descends, row's powder difficulty, mud viscosity is controlled general stratum 18～22S, the loose stratum 19～28S that easily collapses.
(4) control mud PH value
Before mud uses, the pH value of mud is measured.
(5) mud circulating system
When creeping into, in the particulate boring mud sedimentation basin, adopt slush pump to carry premium mud to boring, keep mud circulation.After flowing in the mud pit, the premium mud of sedimentation basin post precipitation flows back in the boring.
Claims (2)
1. the construction process for bored pile near flood wall through riprap layer is being set up framed bent by the flood-control wall side, and framed bent is maked somebody a mere figurehead above flood-control wall, form a drilling platform, the stake machine is placed on the framed bent constructs, and it is characterized in that the concrete technological process of construction is:
(1) removes obstacles and outer casing is buried underground
1) adopt Full Rotary all casing drill to remove obstacles: the soil body in the pile foundation construction influence basin all to be cut, adopt supporting bull grab bucket to abolish piece stone and reach not clear obstruction and clear sleeve diameter 1200mm;
2) bury the outer casing of φ 1200mm underground, then, adopt to dash and grab the rig percussion drilling underground 10～12m that removes obstacles;
(2) interior casing is buried underground
1) the interior casing of processing φ 900mm is 5, wall thickness 16mm, length 10m; The processing diameter is that the geotextiles sheath of 1200mm is some, length 12～13m;
2) be enclosed within the casing outside in the φ 900mm with φ 1200mm geotextiles, end opening is stuck with U shaped steel muscle;
3) the grip interior casing of geotextiles is put into outer casing, adopts the pile cover and the interior casing in outer casing location of processing;
4) with vibrating hammer interior casing is squeezed into about 1m in the soil body, casing can not be shifted in guaranteeing;
5) gap yellow sand backfill between interior casing and the outer casing;
6) outer casing is extracted with the 100t crane, and interior casing and geotextiles are stayed in the hole;
(3) change auger and continue drilling and forming hole
When creeping into, adopt the direct circulation mode to carry out mud circulation, in the particulate boring mud sedimentation basin, adopt slush pump to carry premium mud to boring, keep mud circulation;
(4) clear hole
After boring is finished, after measurement inspection reaches design elevation, carry out hole clearly, once clear hole utilizes the slush pump of the direct circulation system of boring to continue slag absorbing 5～15 minutes, and it is clean that hole subdrilling slag is removed, after finish in once clear hole, remove drilling rod, drill bit rapidly, transfer conduit after laying reinforcing cage, carry out the clear hole of secondary subsequently, sediment and mud property at the bottom of the measured hole;
(5) install reinforcing cage
(6) underwater concrete perfusion
(7) interior casing rises and pulls out
Rise immediately after concrete spouting finishes and pull out interior casing, geotextiles is stayed in the hole, prevents that concrete runs off interior casing recycling.
2. the construction process for bored pile near flood wall through riprap layer according to claim 1 is characterized in that used mud:
(1) control mud liquid level
The liquid level absolute altitude is safeguarded the safety of bottom layer of sand to guarantee enough head pressures in the control hole;
(2) control mud balance
Mud balance is controlled at 1.2;
(3) control mud viscosity
Adopt polyacrylamide to improve viscosity, mud viscosity: general stratum 18～22S, the loose stratum 19～28S that easily collapses;
(4) control mud PH value
Before mud uses, the pH value of mud is measured.
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| CN 200810044178 CN101761072B (en) | 2008-12-24 | 2008-12-24 | Construction process for bored pile close to flood wall through riprap layer |
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| CN 200810044178 CN101761072B (en) | 2008-12-24 | 2008-12-24 | Construction process for bored pile close to flood wall through riprap layer |
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| CN101761072B true CN101761072B (en) | 2011-11-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102677658A (en) * | 2012-04-25 | 2012-09-19 | 北京市三一重机有限公司 | Pile construction method and pile casings |
| CN102747725A (en) * | 2012-07-13 | 2012-10-24 | 中铁二十四局集团上海铁建工程有限公司 | Bored pile construction method with tiny disturbance |
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| GB621450A (en) * | 1947-02-26 | 1949-04-08 | Arthur Brannam Holmes | Improvements in or relating to reinforced concrete piles |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102677658A (en) * | 2012-04-25 | 2012-09-19 | 北京市三一重机有限公司 | Pile construction method and pile casings |
| CN102677658B (en) * | 2012-04-25 | 2015-10-28 | 北京市三一重机有限公司 | hole pile construction method |
| CN102747725A (en) * | 2012-07-13 | 2012-10-24 | 中铁二十四局集团上海铁建工程有限公司 | Bored pile construction method with tiny disturbance |
| CN102747725B (en) * | 2012-07-13 | 2014-12-03 | 中铁二十四局集团上海铁建工程有限公司 | Bored pile construction method with tiny disturbance |
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| CN101761072A (en) | 2010-06-30 |
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Owner name: SHANGHAI FOUNDATION ENGINEERING GROUP CO., LTD. Free format text: FORMER NAME: SHANGHAI FOUNDATION ENGINEERING CO., LTD. |
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Address after: 200433 Yangpu District, Shanghai Star Road, No. 231 Patentee after: Shanghai Foundation Engineering Group Co., Ltd. Address before: 200433 Yangpu District, Shanghai Star Road, No. 231 Patentee before: Shanghai Foundation Engineering Co., Ltd. |