CN103643674A - Erect column pile construction method under geologic condition of pebble bed sandstone - Google Patents
Erect column pile construction method under geologic condition of pebble bed sandstone Download PDFInfo
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- CN103643674A CN103643674A CN201310681285.5A CN201310681285A CN103643674A CN 103643674 A CN103643674 A CN 103643674A CN 201310681285 A CN201310681285 A CN 201310681285A CN 103643674 A CN103643674 A CN 103643674A
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Abstract
The invention relates to an erect column pile pore-forming construction method under the geologic condition of sandstone pebble bed. The mud weight is controlled in a range from 1.15 g/cm<3> to 1.25 g/cm<3>, the viscosity is controlled in a range from 20 s to 30 s, and the sand ratio is not more than 2.5%; clockwise rotary trepanning on site is performed during drilling, and drilling bucket weight, drilling rod weight and hydraulic pressure are taken as drilling pressure; an excavating drill bit is firstly utilized for drilling, a double-baseboard bailing bit is adopted to drill in a silty-fine sand layer, when the double-baseboard bailing bit drills into the pebble bed, a spiral bit is utilized to stir the pebble bed to be loosened, then a rotary excavating barrel is utilized to collect slag, a rock-socketed short spiral bit is utilized for drilling when the sandstone is drilled, and is matched with the double-baseboard bailing bit for cleaning slag, and a large boulder grabbing bit is utilized for treating boulders when larger boulders are encountered during drilling; and a bottom-clearing bit is utilized for cleaning sediments at the pile tip when the bit drills to designed elevation. With the adoption of the erect column pile pore-forming construction method, the problem of pore-forming difficulty under the geologic the condition of sandstone pebble bed can be solved, the soil stability during a drilling process is guaranteed, good pore-forming quality is ensured, and influence on the environment is small.
Description
Technical field
The present invention relates to a kind of construction technology of stand column pile pore-forming, particularly relate to a kind of stand column pile drilling construction method under sandstone boulder bed geological conditions.
Background technology
Lanzhou engineering is the landmark of Lanzhou and even whole the Northwest, and main building height 250m is the Northwest's the first high building.Engineering is positioned at busiest section, center, city, and the contiguous major urban arterial highway of periphery and many buildings residence building, have many municipal pipelines under road, and surrounding enviroment protection is had relatively high expectations.Project first phase foundation ditch area is about 20100m2, and foundation ditch periphery linear meter is 558m, and underground four layers, cutting depth is 23.6m the most deeply, is the deep foundation ditch in whole the Northwest.This project Site soil is poor, and soil body sand content is large.Between engineering superficial part flour sand layer and boulder bed particle, fine grained filler generally lacks, and mud content is little, and transmission coefficient is large, and water permeability is strong; It is lower is sand layers, and this layer has the feature of " meet strength decreased after water softening, disturbance, particularly have under regimen condition intensity after disturbance sharply reduce ", and this layer of distribution whole audience, buried depth is darker.The stand column pile stake hole of this engineering penetrates fine sand layer and boulder bed, and stake bottom, hole is among sand layers.
This engineering construction adopts diaphragm wall in conjunction with the support form of inner support, is the base pit engineering that the Northwest adopts inner support system first, and inner support system needs stand column pile to do vertical support, and corresponding Ye Shi the Northwest adopts the engineering of stand column pile first.There were significant differences for this project stratum and the coastal region in east China, is mainly that the stratum such as cobble and sandstone are main, and the practice of carrying out stand column pile construction at present in the Northwest's cobble and sandstone formation does not almost have.Along with urban construction propelling from east to west progressively; the similar engineering of the Northwest can get more and more later; in order to adapt to the trend of underground space deep layerization development; and in order to adapt to more and more higher environmental protection requirement; the specific environment of incorporation engineering and condition; need to develop a kind of stand column pile drilling construction method that can meet under the land ownership sandstone boulder bed geological conditions of northwest, to meet the needs of engineering construction from now on.
Summary of the invention
The present invention is the stand column pile construction method that will provide under a kind of boulder bed sandstone geological conditions, and this construction method can realize carries out stand column pile drilling construction in the stratum of sandstone, boulder bed.
For achieving the above object, technical scheme of the present invention is: the stand column pile construction method under a kind of boulder bed sandstone geological conditions, and concrete steps are:
(1) select high-quality swell soil prepare mud and creep into
Mud balance is controlled at 1.15～1.25g/cm3, and viscosity is controlled at 20～30s, and sand coarse aggregate ratio is not more than 2.5%; Rig is in place, after slurrying, start to creep into, the original place perforate that turns clockwise while creeping into, then the drilling bucket of usining deadweight, drilling rod are conducted oneself with dignity in addition hydraulic coupling as drilling pressure, rough drill pressure is controlled at 90Kpa, and drilling speed is first slow rear fast, and starting each drilling depth is 40～50cm, after 5 meters, drilling depth, each drilling depth is controlled at 70～90cm;
(2) top fill stratum creeps into
Adopt shoveling drill bit to creep into, fine sand layer adopts Double-bottom-plate to drag for sand drill bit and creeps into, and in the time of in creeping into boulder bed, first with augers, is stirred pine, then tin gets slag with revolving to dig, when creeping into sand layers, adopt rock inserted bit with short screw to creep into, and cooperation is dragged for the scarfing cinder of sand drilling bucket with Double-bottom-plate;
(3) hard soil layer creeps into
Control rate of penetration, use low velocity drilling depth, while running into large erratic boulder in boring, adopt large erratic boulder capture brill to erratic boulder process '
(4) when being drilled into design elevation, with cleanout bit, sediment of the hole bottom is cleared up.
In above-mentioned drilling process, guarantee that in hole, mud face remains higher than casing bottom surface, and be equipped with sand removing machine in order to improve circulating mud quality, strengthen the prop-carrying capacity of mud, according to soil property situation, adjust mud prescription and proportion simultaneously, when boulder bed creeps into, control rate of penetration, improve mud balance and viscosity, and strengthen head.
The invention has the beneficial effects as follows: the present invention can solve the problem of pore-forming difficulty under sandstone boulder bed geological condition, by select suitable drilling equipment in different soil, rationally adjust and control drilling parameter, reduce the easily impact of undergauge in boulder bed, reduce the crank-sided problem in firm hard formation stake hole, reduce sediment thickness at the bottom of hole, and guarantee the stability of the soil body in drilling process, and its Construction Vibration is little, and noise is low, little to ambient influnence.This invention is played promotion, facilitation to the Northwest's Construction Techniques for Deep Foundation Pit, promotes the green technology level of the Northwest's builing industry, to being urban construction service better.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Sand layers has the feature of " meeting strength decreased after water softening, disturbance; particularly have under regimen condition intensity after disturbance sharply reduce ", problem based on boulder bed easy undergauge when the pore-forming again, known, if there is no a kind of effective sandstone boulder bed drilling construction method, in unsettled situations such as caving in very easily appear in the process mesopore Zhou Tuti of pore-forming, be difficult to guarantee the quality of pore-forming.
Stand column pile construction method under boulder bed sandstone geological conditions of the present invention, comprises the steps: to select high-quality swell soil to prepare mud, and mud balance is controlled at 1.15～1.25g/cm3, and viscosity is controlled at 20～30s, and sand coarse aggregate ratio is not more than 2.5%.Rig is in place, after slurrying is qualified, start to creep into, the original place perforate that turns clockwise while creeping into, then the drilling bucket of usining deadweight, drilling rod are conducted oneself with dignity in addition, and hydraulic coupling is as drilling pressure, and rough drill pressure is controlled at 90Kpa, fast after drilling speed is first slow, starting each drilling depth is 40～50cm, after 5 meters, drilling depth as creep into normally, suitably strengthen drilling depth, each drilling depth is controlled at 70～90cm.Top fill stratum adopts shoveling drill bit to creep into, fine sand layer adopts Double-bottom-plate to drag for sand drill bit and creeps into, and in the time of in creeping into boulder bed, first with augers, is stirred pine, then tin gets slag with revolving to dig, when creeping into sand layers, adopt rock inserted bit with short screw to creep into, and cooperation is dragged for the scarfing cinder of sand drilling bucket with Double-bottom-plate.In hard soil layer, not pressurization by force, controls rate of penetration, uses low velocity drilling depth, while running into large erratic boulder in boring, adopts special large erratic boulder to capture to bore erratic boulder is processed.By select suitable drilling equipment in different soil, rationally adjust and control drilling parameter, reduce the easily impact of undergauge in boulder bed, reduce the crank-sided problem in firm hard formation stake hole, and guarantee the stability of the soil body in drilling process.
In drilling process, guarantee that in hole, mud face remains higher than casing bottom surface, to increase head pressure, ensure enough head difference and be beneficial to the stable of hole wall.Be equipped with sand removing machine in order to improve circulating mud quality, strengthen the prop-carrying capacity of mud, reduce sediment thickness at the bottom of hole.According to soil property situation, adjust mud prescription and proportion simultaneously, when boulder bed creeps into, strictly control rate of penetration, suitably improve mud balance and viscosity, and strengthen head, to prevent undergauge, guarantee hole quality.When being drilled into design elevation, with special-purpose cleanout bit, sediment of the hole bottom is cleared up.
Case history:
Lanzhou engineering is the landmark of Lanzhou and even whole the Northwest, main building height 250m, for the Northwest's the first high building, Lanzhou Deep Foundation Pit area is about 20100m2, foundation ditch periphery linear meter is 558m, underground four layers, cutting depth is 23.6m the most deeply, is the deep foundation ditch in whole the Northwest.Between this project superficial part flour sand layer and boulder bed particle, fine grained filler generally lacks, and mud content is little, and transmission coefficient is large, and water permeability is strong, and it is lower is sand layers, this layer of distribution whole audience ground, and buried depth is darker.The stand column pile stake hole of this engineering penetrates fine sand layer and boulder bed, and stake bottom, hole is among sand layers.
By construction method of the present invention, carry out the drilling construction of stand column pile, by engineering practice, prove, stand column pile drilling construction method under sandstone boulder bed geological conditions of the present invention is selected different drilling construction equipment, construction parameter, construction technology etc. according to different geological conditions, in pore forming process, there is not the problem that undergauge and stake hole tilt, hole Zhou Tuti is the state that keeps stable, and this project stand column pile drilling construction quality 100% meets the requirements after testing.
Claims (2)
1. the stand column pile construction method under boulder bed sandstone geological conditions, is characterized in that, concrete steps are:
(1) select high-quality swell soil prepare mud and creep into
Mud balance is controlled at 1.15～1.25g/cm3, and viscosity is controlled at 20～30s, and sand coarse aggregate ratio is not more than 2.5%; Rig is in place, after slurrying, start to creep into, the original place perforate that turns clockwise while creeping into, then the drilling bucket of usining deadweight, drilling rod are conducted oneself with dignity in addition hydraulic coupling as drilling pressure, rough drill pressure is controlled at 90Kpa, and drilling speed is first slow rear fast, and starting each drilling depth is 40～50cm, after 5 meters, drilling depth, each drilling depth is controlled at 70～90cm;
(2) top fill stratum creeps into
Adopt shoveling drill bit to creep into, fine sand layer adopts Double-bottom-plate to drag for sand drill bit and creeps into, and in the time of in creeping into boulder bed, first with augers, is stirred pine, then tin gets slag with revolving to dig, when creeping into sand layers, adopt rock inserted bit with short screw to creep into, and cooperation is dragged for the scarfing cinder of sand drilling bucket with Double-bottom-plate;
(3) hard soil layer creeps into
Control rate of penetration, use low velocity drilling depth, while running into large erratic boulder in boring, adopt large erratic boulder to capture brill erratic boulder is processed;
(4) when being drilled into design elevation, with cleanout bit, sediment of the hole bottom is cleared up.
2. the stand column pile construction method under boulder bed sandstone geological conditions according to claim 1, it is characterized in that: in above-mentioned drilling process, guarantee that in hole, mud face remains higher than casing bottom surface, and be equipped with sand removing machine in order to improve circulating mud quality, strengthen the prop-carrying capacity of mud, according to soil property situation, adjust mud prescription and proportion simultaneously, when boulder bed creeps into, control rate of penetration, improve mud balance and viscosity, and strengthen head.
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| CN201310681285.5A CN103643674B (en) | 2013-12-16 | 2013-12-16 | Erect column pile construction method under geologic condition of pebble bed sandstone |
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| CN201310681285.5A CN103643674B (en) | 2013-12-16 | 2013-12-16 | Erect column pile construction method under geologic condition of pebble bed sandstone |
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| CN103643674A true CN103643674A (en) | 2014-03-19 |
| CN103643674B CN103643674B (en) | 2015-06-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107386963A (en) * | 2017-08-01 | 2017-11-24 | 中国五冶集团有限公司 | A kind of rotary digging bored concrete pile meets big particle diameter cobble drilling construction method and embraces stone bucket and bores |
| CN108060894A (en) * | 2017-12-12 | 2018-05-22 | 中交公局第二工程有限公司 | A kind of boring method under complex geological condition |
| CN108060893A (en) * | 2017-12-12 | 2018-05-22 | 中交公局第二工程有限公司 | A kind of gas lift reverse circulation drilling machine construction method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013112937A (en) * | 2011-11-25 | 2013-06-10 | Fudo Tetra Corp | Press-in pile method with unsaturation function, and construction device used for the method |
| CN103266599A (en) * | 2013-05-13 | 2013-08-28 | 汇通路桥建设集团有限公司 | Construction method of rotating drilling dry-drilled piles of sand soil interlayer foundation |
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2013
- 2013-12-16 CN CN201310681285.5A patent/CN103643674B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013112937A (en) * | 2011-11-25 | 2013-06-10 | Fudo Tetra Corp | Press-in pile method with unsaturation function, and construction device used for the method |
| CN103266599A (en) * | 2013-05-13 | 2013-08-28 | 汇通路桥建设集团有限公司 | Construction method of rotating drilling dry-drilled piles of sand soil interlayer foundation |
Non-Patent Citations (1)
| Title |
|---|
| 何世荣: "不良地质条件下钻孔灌注桩钻孔施工中常见问题及处理措施", 《甘肃科技纵横》, vol. 41, no. 3, 30 June 2012 (2012-06-30), pages 100 - 101 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107386963A (en) * | 2017-08-01 | 2017-11-24 | 中国五冶集团有限公司 | A kind of rotary digging bored concrete pile meets big particle diameter cobble drilling construction method and embraces stone bucket and bores |
| CN107386963B (en) * | 2017-08-01 | 2019-03-22 | 中国五冶集团有限公司 | A kind of rotary digging bored concrete pile meets big partial size cobble drilling construction method and embraces stone bucket and bores |
| CN108060894A (en) * | 2017-12-12 | 2018-05-22 | 中交公局第二工程有限公司 | A kind of boring method under complex geological condition |
| CN108060893A (en) * | 2017-12-12 | 2018-05-22 | 中交公局第二工程有限公司 | A kind of gas lift reverse circulation drilling machine construction method |
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| CN103643674B (en) | 2015-06-03 |
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| ASS | Succession or assignment of patent right |
Owner name: GANSU TIANHONG JINYUN CO., LTD. Effective date: 20141230 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wu Jiemei Inventor after: Liu Yonghui Inventor after: Liu Jiafeng Inventor after: Luo Yunfeng Inventor after: Wu Tao Inventor after: Xu Hua Inventor after: Li Qi Inventor before: Wu Jiemei Inventor before: Liu Jiafeng Inventor before: Luo Yunfeng Inventor before: Wu Tao Inventor before: Xu Hua |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: WU JIEMEI LIU JIAFENG LUO YUNFENG WU TAO XU HUA TO: WU JIEMEI LIU YONGHUI LIU JIAFENG LUO YUNFENG WU TAO XU HUA LI QI |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20141230 Address after: 200433 Yangpu District, Shanghai Star Road, No. 231 Applicant after: Shanghai Foundation Engineering Group Co., Ltd. Applicant after: Gansu Tianhong Jinyun Co., Ltd. Address before: 200433 Yangpu District, Shanghai Star Road, No. 231 Applicant before: Shanghai Foundation Engineering Group Co., Ltd. |
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