CN103643674B - 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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- CN103643674B CN103643674B CN201310681285.5A CN201310681285A CN103643674B CN 103643674 B CN103643674 B CN 103643674B CN 201310681285 A CN201310681285 A CN 201310681285A CN 103643674 B CN103643674 B CN 103643674B
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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, main building height 250m, is the Northwest 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, surrounding enviroment protection requires higher.Project first phase foundation ditch area is about 20100m2, and foundation ditch periphery linear meter is 558m, four layers, underground, and cutting depth is 23.6m the most deeply, is the most deep foundation ditch in whole the Northwest.This project Site soil is poor, and soil body sand content is large.Fine grained filler general absence between engineering superficial part silty sand ground and boulder bed particle, mud content is little, and transmission coefficient is large, and water permeability is strong; It is lower is sand layers, and the feature that this layer has " after meeting water softening, disturbance, intensity reduces, and particularly to have under regimen condition intensity after disturbance sharply reduce ", and this layer distribution whole audience ground, buried depth is darker.The stand column pile stake holes of this engineering penetrates fine sand layer and boulder bed, and stake holes bottom is among sand layers.
This engineering construction adopts diaphragm wall in conjunction with the support form of inner support, and be the base pit engineering that the Northwest adopts inner support system first, 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, and mainly the stratum such as cobble and sandstone is main, and the practice 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 later the Northwest can get more and more; 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 carrying 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) high-quality swell soil is selected to prepare mud and creep into
Mud balance controls at 1.15 ~ 1.25g/cm
3, viscosity controls at 20 ~ 30s, and sand coarse aggregate ratio is not more than 2.5%; Driller insertion, start after slurrying to creep into, when creeping into, original place turns clockwise perforate, then using drilling bucket deadweight, drilling rod conduct oneself with dignity in addition hydraulic coupling as drilling pressure, rough drill Stress control is 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 controls at 70 ~ 90cm;
(2) top fill stratum creeps into
Shoveling drill bit is adopted to creep into, fine sand layer adopts Double-bottom-plate to drag for sand drill bit and creep into, and is first stirred pine with augers when creeping in boulder bed, then digs cylinder get slag with revolving, adopt rock inserted bit with short screw to creep into when creeping into sand layers, and cooperation Double-bottom-plate drag for the scarfing cinder of sand drilling bucket;
(3) hard soil layer creeps into
Control rate of penetration, use low velocity drilling depth, when hole in run into large erratic boulder time, adopt large erratic boulder capture bore to erratic boulder process '
(4) sediment of the hole bottom is cleared up with cleanout bit when being drilled into design elevation.
Ensure in above-mentioned drilling process 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, simultaneously according to soil property situation adjustment mud prescription and proportion, 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 selecting suitable drilling equipment in different soil, Reasonable adjustment and control drilling parameter, reduce the impact of easily undergauge in boulder bed, reduce the crank-sided problem of firm hard formation stake holes, sediment thickness at the bottom of reduction holes, and ensure the stability of the soil body in drilling process, and its Construction Vibration is little, noise is low, little to ambient influnence.This invention plays promotion, facilitation to the Northwest's Construction Techniques for Deep Foundation Pit, promotes the green technology level of the Northwest builing industry, to being urban construction service better.
Detailed description of the invention
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
The feature that sand layers has " meet water softening, intensity reduces after disturbance; particularly to have under regimen condition intensity after disturbance sharply reduce ", again based on the problem of boulder bed easy undergauge when pore-forming, known, if there is no a kind of effective sandstone boulder bed drilling construction method, very easily there is the situation of instability such as caving at the process mesopore Zhou Tuti of pore-forming, be difficult to the quality ensureing pore-forming.
Stand column pile construction method under boulder bed sandstone geological conditions of the present invention, comprise the steps: to select high-quality swell soil to prepare mud, mud balance controls at 1.15 ~ 1.25g/cm
3, viscosity controls at 20 ~ 30s, and sand coarse aggregate ratio is not more than 2.5%.Driller insertion, namely start after slurrying is qualified to creep into, when creeping into, original place turns clockwise perforate, then conducting oneself with dignity in addition using drilling bucket deadweight, drilling rod, hydraulic coupling is as drilling pressure, and rough drill Stress control is at 90Kpa, fast after drilling speed is first slow, starting each drilling depth is 40 ~ 50cm, as normal in crept into after 5 meters, drilling depth, suitably strengthen drilling depth, each drilling depth controls 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 creep into, and is first stirred pine with augers when creeping in boulder bed, then digs cylinder get slag with revolving, adopt rock inserted bit with short screw to creep into when creeping into sand layers, and cooperation Double-bottom-plate drag for the scarfing cinder of sand drilling bucket.Do not pressurize by force in hard soil layer, control rate of penetration, use low velocity drilling depth, when running into large erratic boulder in holing, adopting special large erratic boulder to capture brill and erratic boulder is processed.By selecting suitable drilling equipment in different soil, Reasonable adjustment and control drilling parameter, reduce the impact of easily undergauge in boulder bed, reduce the crank-sided problem of firm hard formation stake holes, and ensure the stability of the soil body in drilling process.
Ensure in drilling process 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, sediment thickness at the bottom of reduction holes.Simultaneously according to soil property situation adjustment mud prescription and proportion, when boulder bed creeps into, strictly control rate of penetration, suitably improve mud balance and viscosity, and strengthen head, to prevent undergauge, ensure hole quality.Sediment of the hole bottom is cleared up with special cleanout bit when being drilled into design elevation.
Case history:
Lanzhou engineering is the landmark of Lanzhou and even whole the Northwest, main building height 250m, and be the Northwest first high building, Lanzhou Deep Foundation Pit area is about 20100m
2, foundation ditch periphery linear meter is 558m, four layers, underground, and cutting depth is 23.6m the most deeply, is the most deep foundation ditch in whole the Northwest.Fine grained filler general absence between this project superficial part silty sand ground and boulder bed particle, mud content is little, and transmission coefficient is large, and water permeability is strong, and it is lower is sand layers, and this layer distribution whole audience ground, buried depth is darker.The stand column pile stake holes of this engineering penetrates fine sand layer and boulder bed, and stake holes bottom is among sand layers.
The drilling construction of stand column pile is carried out by construction method of the present invention, proved by engineering practice, stand column pile drilling construction method under sandstone boulder bed geological conditions of the present invention selects different drilling construction equipment, construction parameter, construction technology etc. according to different geological conditions, the problem that undergauge and stake holes tilt is there is not in pore forming process, hole Zhou Tuti keeps stable state, 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, it is characterized in that, concrete steps are:
(1) high-quality swell soil is selected to prepare mud and creep into
Mud balance controls at 1.15 ~ 1.25g/cm
3, viscosity controls at 20 ~ 30s, and sand coarse aggregate ratio is not more than 2.5%; Driller insertion, start after slurrying to creep into, when creeping into, original place turns clockwise perforate, then using drilling bucket deadweight, drilling rod conduct oneself with dignity in addition hydraulic coupling as drilling pressure, rough drill Stress control is 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 controls at 70 ~ 90cm;
(2) top fill stratum creeps into
Shoveling drill bit is adopted to creep into, fine sand layer adopts Double-bottom-plate to drag for sand drill bit and creep into, and is first stirred pine with augers when creeping in boulder bed, then digs cylinder get slag with revolving, adopt rock inserted bit with short screw to creep into when creeping into sand layers, and cooperation Double-bottom-plate drag for the scarfing cinder of sand drilling bucket;
(3) hard soil layer creeps into
Control rate of penetration, use low velocity drilling depth, when running into large erratic boulder in holing, adopting large erratic boulder to capture brill and erratic boulder is processed;
(4) sediment of the hole bottom is cleared up with cleanout bit when being drilled into design elevation.
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, ensure 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, simultaneously according to soil property situation adjustment mud prescription and proportion, 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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| CN103643674B true CN103643674B (en) | 2015-06-03 |
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| 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 |
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 |
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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 |
|---|
| 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;何世荣;《甘肃科技纵横》;20120630;第41卷(第3期);第100-101页 * |
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Owner name: GANSU TIANHONG JINYUN CO., LTD. Effective date: 20141230 |
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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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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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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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