CN1206421C - A drill hole grout pile drag reduction extraction process - Google Patents
A drill hole grout pile drag reduction extraction process Download PDFInfo
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- CN1206421C CN1206421C CN 03129284 CN03129284A CN1206421C CN 1206421 C CN1206421 C CN 1206421C CN 03129284 CN03129284 CN 03129284 CN 03129284 A CN03129284 A CN 03129284A CN 1206421 C CN1206421 C CN 1206421C
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Abstract
The present invention relates to a drag reduction extraction process of a drill hole grout pile, which belongs to the field of building engineering. The present invention comprises the following steps: firstly, successively driving section steel into the pile periphery of a drill hole grout pile to be extracted by a hammer in a pile extracting construction flow for reducing the influence of correlation factors of pile extraction resistance until the drill hole grout pile and soil are completely or partially disengaged; secondly, a reinforced bar at the pile head of the drill hole grout pile is cut out, and is welded with a steel tube; then, a hydraulic extracting machine is used for extracting and loosening the drill hole grout pile; finally, a hoisting machine is used for hoisting the drill hole grout pile. The present invention has substantive characteristics and obvious progress, drag reduction effect is basically within 93.6% to 99.5%, and the drag reduction effect of a part of pile is even up to 100%. The present invention has the advantages of ideal drag reduction effect, short pile extracting time, small environmental influence on the periphery of pile extraction, simple pile extracting technical flow, etc., and one pile can be extracted by two to three hours.
Description
Technical field
What the present invention relates to is a kind of bored pile removal method, and in particular a kind of bored pile drag reduction removal method belongs to building engineering field.
Background technology
Usually because the structure of elder generation's construction are not considered the construction of follow-up structure, the obstruction that runs in the construction is also more and more in construction work, and the bored pile of especially pulling out the existing structure thing is very common.Pile pulling work often becomes the principal element of the duration of the whole new construction of restriction owing to its all uncertain factor.The process of pile pulling generally comprised for two steps: at first reduce pile side resistance, then pile pulling.And the key technology of pile pulling is the starting point is exactly how to reduce pile side resistance.At present, the method that reduces pile side friction mainly contains: (1) vibration drag reduction method (2) boring drag reduction method (3) electric osmose drag reduction method, all there be defective and weak point in various degree in above-mentioned three kinds of drag reduction methods: the drag-reduction effect of vibration drag reduction method is not obvious, and vibration is big to the surrounding soil disturbance; The workload of rule boring of boring drag reduction and water spray is bigger; Electric osmose drag reduction rule working procedure complexity, the scope of application is little, dangerous and length consuming time etc.Find by literature search, the patentee is: Engineering Design Co. of Bohai Petroleum Corp., the patent No. is: 92101355.8, name is called: offshore platform rigid pile foundation and sinking thereof and method for floating, this patent mainly solves a kind of pile pulling method of rigid pile of offshore platform, and plenum chamber and top air chamber are arranged in this patent utilization column, inflates in the basis during pile pulling floating it is ejected the mud face, the pile pulling method of this patent obviously only is applicable to the pile pulling of the rigid pile of offshore platform, and range of application is very limited.Literature search is found again: the utility model patent people: Yellow River Affair Bureau, Jiaozuo City, and the patent No. is: 99253395.3, the applying date is: 1999.11.19, name is called; A kind of pile extractor.This utility model discloses a kind of pile pulling construction equipment.The disclosure of this patent relates to: by hand-hydraulic jacking mechanism jack-up sprocket wheel link chain mechanism, chain forces in jig stake is extracted.Though this patent can be used for the lower building operations of construction requirement, inapplicable its bored pile of pulling out works that utilizes, and require to reduce pile side friction effectively, make the smooth occasion of pile pulling.
Summary of the invention
The present invention is directed to the deficiency and the defective of existing pile pulling technology, a kind of simple and practical bored pile drag reduction removal method is provided, utilization reduces the principle of pile side friction, squeeze into the way of shaped steel in stake week, make and treat that pile pulling and surrounding soil break away from, thereby reduce pile side friction effectively, make pile pulling smooth.The present invention is achieved by the following technical solutions, method is specific as follows: for the influence of the correlative factor that reduces pile extraction resistance, at first in the pile pulling construction process, wait to pull out bored pile stake week and squeeze into shaped steel successively, break away from wholly or in part until stake and soil with vibrating hammer; Then drill-pouring pile head reinforcing bar is dug out and with steel pipe welding, adopt hydraulic pressure to work the machine of pulling out again and stake is risen pull out looseningly, with loop wheel machine stake is sling at last.
Below the inventive method is further described:
(1) pertinency factor of pile extraction resistance is determined
Specific as follows: for the bored pile in the weak soil, it is cylindrical slip-crack surface that its resistance to plucking destroys form, promptly destroy along the stake soil contact face, correspondingly, its limit resistance to plucking resistance T
uPertinency factor is as follows:
T
U＝αULτ
p+W
c
Wherein: T
U-ultimate pullout capacity, unit: kPa; The stake of L-underground is long, unit: m; W
cThe effective weight of-stake, unit: kN; The shear strength reduction coefficient of α-soil gets 0.6 when stake is long during less than 6m, grows up in 20m when stake, gets 0.8, when 6～20m, then at 0.6～0.8 by linear interpolation; U-stake girth, unit: m; τ
p--stake and native weighting limit frictional resistance, unit: kPa.
(2) the pile-pulling construction method concrete steps are:
1. preparation of construction
Before the pile pulling, should carry out preparation of construction work, content comprises: the diameter, the degree of depth, stake of determining stake with between gap, the cleaning of construction plant, pile crown cut, shaped steel, vibrating hammer have reached and have pulled out, the marching into the arena and debugging or the like of lifting appliance.
2. stake is squeezed into shaped steel in week
The shaped steel web length that is adopted is slightly larger than treats that pile pulling directly gets final product, length is grown together with treating pile pulling, piling power adopts the electric vibrating hammer, inject a small amount of clear water at the stake periphery during shaped steel vibration-sunk, reach the dilution soil body, also can play the purpose that reduces bored pile limit collateral resistance, shaped steel is beaten at the bottom of the stake and is promptly extracted behind the absolute altitude, squeezes into four times shaped steel around every pile successively.
3. weld the jacking hanging piece
Generally speaking, bored pile is at underground certain depth place, before the pile pulling, need the soil body in the stake to be excavated and dug out pile crown, expose reinforcing bar, in order to pull and to lift by crane conveniently, need waiting to pull out welding one round steel pipe on the filling pile cage of reinforcement, the external diameter of round steel pipe is slightly less than the interior clean diameter of the main muscle of stake, and weld strength should satisfy pulls out requirement, round steel pipe length is convenient to pull and is advisable with exposure on the ground.
4. jack is installed
According to above-mentioned pile extraction resistance calculated value, determined to pull out rising of jack and pulled out ability, treat that the jacking hanging piece welds after, can will rise and pull out jack and be placed in the jacking hanging piece, and be placed on the steel truss.
5. rise and pull out
Treat that pull-up installation (being installed on the steel truss) debugging finishes, and has promptly begun to pull out.Rising and pulling out purpose is to make pile body loosening, thereby is convenient to the lifting of loop wheel machine safety.
6. lifting
Pile body rise pull out loosening after, could lift by crane with loop wheel machine.According to pile extraction resistance, adopt KH series loop wheel machine (KH100, KH500, KH700 etc.), carry on should be slowly during lifting, rock to prevent pile body.
The present invention has substantive distinguishing features and marked improvement.Engineering practice shows, drag-reduction effect of the present invention basically between 93.6%-99.5%, the drag-reduction effect of part stake even reach 100%.Advantages such as the present invention also has the pile pulling time short (can pull out a pile in 2-3 hour) except drag-reduction effect is very good, pile pulling is little to surrounding environment influence, and the pile pulling technological process is simple.
The specific embodiment
Certain implements engineering, ventilating shaft and access structure buried depth 7.8m, space enclosing structure is long 17m, Φ 600 bored piles, the space enclosing structure outside is long 14m, Φ 700 cement mixing methods, form cross with the construction site, directly influence about 14 of the bored pile of building site construction of continuous concrete wall, therefore before construction, must be pulled out the bored pile that influences engineering construction.
1, pile extraction resistance is calculated
Be the unconsolidated sediment since the Epileistocene in the Quaternary Period in the 60m depth bounds of place, the construction plant is smooth, ground level is+3.9m about.The distribution of strata in this place and part physico-mechanical properties parameter see table 1 for details.
Clay distribution and part physico-mechanical properties parameter list 1
| The soil layer level number | The soil layer title | Bed thickness | Water content W (%) | Severe r (kN/m 3) | Stake side pole limit frictional resistance (kPa) |
| ① | Banket | 1.50 | |||
| ② 1 | Brown Huang ~ lark silty clay | 1.60 | 31.6 | 18.5 | 15 |
| ② L | Grey mud matter silty clay | 1.10 | 37.1 | 17.9 | 15 |
| ② 2 | The grey clay silt | 2.45 | 32.0 | 18.3 | 15 |
| ③ | Grey mud matter silty clay | 2.10 | 41.4 | 17.5 | 15 |
| ④ | The grey silt clay | 8.20 | 53.1 | 16.6 | 15 |
| ⑤ 1 | Gray clay | 3.00 | 42.2 | 17.4 | 25 |
Obstruction that this engineering is met is the long 17m of bored pile, but a stake top 2m rises and cut before pulling out, and stake is long in 15m; In addition, the bored pile outside is close together with the cement mixing method water-stop curtain, and the compressive strength of agitation pile should be more than 1MPa, and its shear strength is generally got 1/3 of compressive strength; So when carrying out pile extraction resistance calculating, collateral resistance divides two parts, a half side-view contacts with the soil body, is the Pile Soil frictional resistance; One half side-view contacts with cement mixing method, is stake-cement-soil frictional resistance.1. pile peripheral earth be followed successively by and banket, 2.
1Brown Huang ~ lark silty clay, 2.
LGrey mud matter silty clay, 2.
2Grey clay silt, 3. grey mud matter silty clay and 4. grey silt clay.With above-mentioned parameter formula to be gone into (1), then pile extraction resistance is:
T
u＝0.728×3.14×0.6×15×(15+333)×0.5+24×3.14×0.6×0.6×0.25×15＝3680.8kN。So big pile extraction resistance certainly will bring great difficulty to pile pulling, therefore, must reduce pile extraction resistance.
2, the concrete steps of pile-pulling construction method are:
1. preparation of construction
Before the pile pulling, the foreign material that have influence on the Bored Pile Construction place are cleaned out; The soil body is excavated on the bored pile; Pile crown cuts and exposes reinforcing bar; With model is 700 * 300 * 18 * 12 H shaped steel (long 17m), electric vibrating hammer and hydraulic pressure is pulled machine, KH500 (100T) loop wheel machine is marched into the arena and debug or the like.
2. stake is squeezed into shaped steel in week
Adopt electric vibrating to beat above-mentioned model H shaped steel shaped steel into treating the pile pulling side, inject clear water on a small quantity at the stake periphery during shaped steel vibration-sunk, reach the dilution soil body and reduce the purpose of bored pile limit collateral resistance, shaped steel is beaten at the bottom of the stake and is promptly extracted behind the absolute altitude, and every pile Zhou Yici squeezes into shaped steel four times.
3. weld the jacking hanging piece
Waiting to pull out welding one round steel pipe on the filling pile cage of reinforcement, the round steel pipe lower diameter is the long 1.5m of 435mm (just can be welded in the borehole filling pile cage of reinforcement of diameter 600mm), and the steel pipe upper diameter is 1000mm, long 2m.Weld strength should satisfy pulls out requirement
4. jack is installed
Select for use the hydraulic pressure of diaphragm wall fore shaft pipe to pull the power set of machine for this pile pulling, it works the ability of pulling out and reaches 200T.The hydraulic pressure machine of pulling is placed on the steel truss, and the anchor ear of pulling machine is held the round steel pipe of above-mentioned 1000mm tightly.
5. rise and pull out
Treat that the hydraulic pressure machine of pulling installs (being installed on the steel truss) debugging and finish, promptly opening power starts drawbench and has begun to pull out.
6. lifting
Pile body rise pull out loosening after, adopt KH500 type loop wheel machine, carry on should be slowly during lifting, rock to prevent pile body.
The equipment of pile pulling sees table 2 for details.
Pile pulling device therefor table table 2
| Sequence number | Title | Model specification | Unit | Quantity | Purposes |
| 1 | Crawler crane | KH500(100T) | Platform | 1 | The lifting bored pile |
| 2 | The hydraulic pipe drawing machine | Self-control 200t | Cover | 1 | Rise and pull out bored pile |
| 3 | The hanging piece steel pipe | 800mm | m | 5 | Connect castinplace pile and drawbench |
| 4 | Dc welding machine | AX-320 * 1 type (14kW) | Platform | 2 | Welded steel pipe and castinplace pile steel |
| 5 | Steel truss | Root | 2 | Pull out platform as rising | |
| 6 | Pneumatic pick | Dig out the pile crown reinforcing bar |
3, pile pulling effect analysis
According to above-mentioned flow process, according to the pile pulling actual conditions at scene, adopt the pile pulling effect of this method very good, whole pile pulling process is also very smooth, and about 2 ~ 3 hours of the time of pulling out of every pile, the resistance of actual measurement pile pulling sees table 3 for details.
The pile extraction resistance measured value table table 3 of bored pile
| The stake numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Pile extraction resistance (kN) | 148. 2 | 242. 2 | 289. 3 | 224. 6 | 195. 2 | 489. 2 | 117. 6 | Directly hang | 164.6 |
| Inverse pile side friction (kPa) | 5.13 | 8.29 | 11.0 6 | 7.25 | 5.51 | 22.8 5 | 0.93 | / | 3.71 |
| Drag reduction degree (%) | 97.1 | 95.2 | 93.6 | 95.8 | 96.8 | * | 99.5 | / | 97.9 |
| The stake numbering | 10 | 11 | 12 | 13 | 14 | ||||
| Pile extraction resistance | Directly | 165. | Directly | 148. | Directly |
| (kN) | Hang | 8 | Hang | 2 | Hang | ||||
| Inverse pile side friction (kPa) | / | 3.78 | / | 2.74 | / | ||||
| Drag reduction degree (%) | / | 97.8 | / | 98.4 | / |
Annotate: 1. No. 1 stake top 8m cuts before rising and pulling out;
2. the resistance to plucking resistance comprises deadweight, and during pile side friction, deadweight is deducted after inverse is squeezed into shaped steel;
3. No. 6 stakes have the reaming phenomenon, and reaming place stake directly reaches 80cm, and therefore, it rises, and to pull out resistance much bigger than other.
As can be seen from Table 3, except that No. 6 stakes, 8,10,12, No. 14 stakes can directly be extracted, and after squeezing into shaped steel, its pile side resistance has approached zero; It is 93.6% ~ 99.5% that the pile side resistance of all the other reduces amplitude, and visible drag-reduction effect is very good, has illustrated that also this drag reduction pile pulling pile pulling method is practicable.
Claims (2)
1, a kind of bored pile drag reduction removal method, it is characterized in that method is specific as follows: for the influence of the correlative factor that reduces pile extraction resistance, at first in the pile pulling construction process, wait to pull out bored pile stake week and squeeze into shaped steel successively with vibrating hammer, shaped steel is beaten at the bottom of the stake and is promptly extracted behind the absolute altitude, breaks away from wholly or in part until stake and soil; Then drill-pouring pile head reinforcing bar is dug out and with steel pipe welding, adopt hydraulic pressure to work the machine of pulling out again and stake is risen pull out looseningly, with loop wheel machine stake is sling at last.
2, this bored pile drag reduction removal method according to claim 1 is characterized in that the concrete steps of pile-pulling construction method are:
1. preparation of construction promptly before the pile pulling, should be carried out preparation of construction work, and content comprises: the diameter, the degree of depth, stake of determining stake with between gap, the cleaning of construction plant, pile crown cut, shaped steel, vibrating hammer have reached and have pulled out, the marching into the arena and debugging of lifting appliance;
2. stake is squeezed into shaped steel in week, the shaped steel web length that is promptly adopted is slightly larger than treats that pile pulling directly gets final product, length is grown together with treating pile pulling, piling power adopts the electric vibrating hammer, inject a small amount of clear water at the stake periphery during shaped steel vibration-sunk, the dilution soil body reduces bored pile limit collateral resistance, shaped steel is beaten at the bottom of the stake and is promptly extracted behind the absolute altitude, squeezes into four times shaped steel around every pile;
3. weld the jacking hanging piece, be that bored pile is underground, before the pile pulling, the soil body in the stake need be excavated and digs out pile crown, expose reinforcing bar, waiting to pull out welding one round steel pipe on the filling pile cage of reinforcement, the external diameter of round steel pipe is slightly less than the interior clean diameter of the main muscle of stake, weld strength has satisfied pulls out requirement, and round steel pipe length with exposure on the ground;
4. jack is installed,, has been determined to pull out rising of jack and pulled out ability promptly according to above-mentioned pile extraction resistance calculated value, treat that the jacking hanging piece welds after, be about to pull out jack and be placed in the jacking hanging piece, and be placed on the steel truss;
5. rise and pull out, treat that promptly the pull-up Installation and Debugging finish, and have begun to pull out;
6. lifting, promptly pile body rise pull out loosening after, according to pile extraction resistance, determine the loop wheel machine lifting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03129284 CN1206421C (en) | 2003-06-12 | 2003-06-12 | A drill hole grout pile drag reduction extraction process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03129284 CN1206421C (en) | 2003-06-12 | 2003-06-12 | A drill hole grout pile drag reduction extraction process |
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| Publication Number | Publication Date |
|---|---|
| CN1482309A CN1482309A (en) | 2004-03-17 |
| CN1206421C true CN1206421C (en) | 2005-06-15 |
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|---|---|---|---|
| CN 03129284 Expired - Fee Related CN1206421C (en) | 2003-06-12 | 2003-06-12 | A drill hole grout pile drag reduction extraction process |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296610B (en) * | 2011-05-19 | 2013-05-08 | 中天建设集团有限公司 | Device for removing square pile and construction method thereof |
| CN102493455A (en) * | 2011-12-20 | 2012-06-13 | 中铁第四勘察设计院集团有限公司 | Method for removing foundation piles |
| CN104746519A (en) * | 2015-02-04 | 2015-07-01 | 邵阳学院 | Obstacle clearing construction method |
| CN105442605B (en) * | 2015-11-20 | 2017-06-30 | 常州第一建筑集团有限公司 | Extract PHC and be reused in deep foundation pit supporting construction method |
| CN106193042B (en) * | 2016-07-20 | 2018-02-13 | 中建八局第三建设有限公司 | Obstacle pile sweep-out method at ground wall is gone along with sb. to guard him close in underground structure sandy soil layer |
| CN108612104B (en) * | 2016-11-11 | 2020-08-28 | 叶长青 | Tubular pile pulling method |
| CN106758889A (en) * | 2017-04-01 | 2017-05-31 | 浙江龙翔建设有限公司 | Steel trestle method for dismounting |
| CN107023008B (en) * | 2017-04-01 | 2022-08-09 | 南京瑞迪建设科技有限公司 | Pile pulling method and system for open caisson platform for retaining wall and counterforce |
| CN106968252B (en) * | 2017-04-01 | 2022-08-09 | 南京瑞迪建设科技有限公司 | Pile pulling recharging method and pile pulling recharging system |
| CN106836223B (en) * | 2017-04-11 | 2022-06-21 | 国强建设集团有限公司 | Pile pulling method |
| CN110409447A (en) * | 2019-07-31 | 2019-11-05 | 江苏省地质矿产局第三地质大队 | Device and method for pulling pile through existing bridge by shield |
| CN114606953B (en) * | 2022-01-11 | 2024-04-09 | 索泰克(北京)岩土科技有限公司 | Recoverable H-shaped steel and corresponding supporting structure |
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| CN1482309A (en) | 2004-03-17 |
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