CN102352627A - Static pressure reinforcing treatment method for pile with unqualified bearing capacity - Google Patents
Static pressure reinforcing treatment method for pile with unqualified bearing capacity Download PDFInfo
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- CN102352627A CN102352627A CN2011102204137A CN201110220413A CN102352627A CN 102352627 A CN102352627 A CN 102352627A CN 2011102204137 A CN2011102204137 A CN 2011102204137A CN 201110220413 A CN201110220413 A CN 201110220413A CN 102352627 A CN102352627 A CN 102352627A
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Abstract
The invention provides a static pressure reinforcing treatment method for a pile with unqualified bearing capacity. The method comprises the following steps of: selecting proper pile static pressure equipment; treating the pile head of the pile with unqualified bearing capacity; performing static pressure pile sinking; performing static repressing and pile sinking; recording and marking; analyzing the bearing capacity unqualified reason of the pile; connecting the pile; and refilling soil and compacting. The method has the advantages that: under the condition that the pile is not repaired, the pile with unqualified bearing capacity is statically pressed according to the designed load by adopting the static pressure equipment, and the pile is necessarily treated after the bearing capacity is stable, so that the bearing capacity of the pile meets the requirement. The method is simple, feasible, intuitive, reliable and definite in judging a construction process, a quality control defect or geological drilling data and actual engineering difference. The treatment construction period is short, and the manufacturing cost of the foundation engineering is saved. The method can be widely applied to reinforcing treatment of the pile with unqualified bearing capacity in a certain range, is convenient to apply and has broad prospect.
Description
Technical field
The present invention relates to the technology of pile foundation engineering structure, is a kind of to the defective stake of bearing capacity static pressure reinforcing and processing method.
Background technology
Engineering practice for many years finds, behind pile foundation construction, carries out the pile capacity test or when detecting, often finds that the sedimentation of stake surpasses the limit value of the single-pile static loading test total settlement 40mm of regulation and stipulation, or bearing capacity situation about not meeting the demands.
Produce the underproof reason of bearing capacity of pile foundation following several respects reason generally arranged:
1, a small amount of pile quality reason strength deficiency, long bearing stratum that does not reach designing requirement inadequately of stake of causing because of using inferior materials and turning out substandard goods;
2, there are gross differences in geological drilling data and actual engineering Geological Characteristics.
3, it is defective that the castinplace pile great majority belong to the bearing capacity that construction technology or quality control defective cause, and mainly contains:
(1) because of construction technology or quality control defective cause the hole at the bottom of sediment too much, a stake end, be not supported on the bearing stratum, and be seated on the loosened soil that sediment too much forms, and reduced end resistance.
(2) cause a side mud skin blocked up because of construction technology or slurry coat method quality control defective, make stake with stake week soil a slippage takes place, stake week soil the frictional resistance of stake weakened or lose.
(3) cause broken pile or pile body folder mud defective because of watering construction technology or quality control defective.
When 4, preformed pile adopted power or static pressure pile-sinking, because of construction technology and Working Procedure Controlling defective cause a lifting, pile foundation floated.
Usually solving the defective way of pouring pile bearing capacity is to mend stake to handle; In the time can't mending the defective stake of multi-column pier foundation bearing capacity periphery, take to strengthen that cushion cap increases total amount of pile or consolidated subsoil improves pile perimeter resistance etc.Mending also needs that stake is mended in the back after the stake and carry out bearing capacity and detect.These method costs are high, long in time limit, and change in heavily distribution of mending the stake of stake back and the stressed approach of stake, can cause soil rigidity uneven, and sedimentation is difficult to problems such as control.
Summary of the invention
For solving the weak point in the defective processing method of pouring pile bearing capacity in the past; The purpose of this invention is to provide the defective stake of a kind of bearing capacity static pressure reinforcing and processing method; Do not mending under the situation; Adopt static pressure equipment to bearing capacity defective stake carrying out static pressure and necessary the processing, make the bearing capacity of stake reach requirement and need not carry out the bearing capacity detection to stake once more after handling simultaneously.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts provides the defective stake of a kind of bearing capacity static pressure reinforcing and processing method, may further comprise the steps:
(1) the static pressure equipment of selection stake
(2) pile crown of the defective stake of bearing capacity is handled
(3) static pressure pile-sinking
(4) static pressure is pressed pile sinking again
(5) record, sign
(6) analyze the defective reason of pile capacity
(7) pile extension is handled
(8) backfill compaction.
Effect of the present invention is not mend under the situation, adopts static pressure equipment that bearing capacity defective stake carrying out static pressure is handled with necessary, makes pile capacity reach requirement after the processing and need not carry out bearing capacity to stake once more and detect.The present invention simultaneously is simple, intuitive and reliable, and the processing duration is short, construction costs is low.This structure can be widely used in the consolidation process of the defective castinplace pile of bearing capacity in the certain limit, gathers around to have broad application prospects.
Description of drawings
Fig. 1 is that pile crown of the present invention is handled sketch map;
Fig. 2 is that static pressure pile-sinking of the present invention is handled sketch map;
Fig. 3 is a stake come-up sketch map of the present invention;
Fig. 4 is a pile extension sketch map of the present invention.
Among the figure: A, defective stake B, back pile extension
The standard value of F, veritcal limit bearing capacity
Sedimentation value after sedimentation value h behind H, the static pressure, the come-up
The specific embodiment
Below in conjunction with accompanying drawing the defective stake of bearing capacity of the present invention static pressure reinforcing and processing method is illustrated.
The defective stake of bearing capacity of the present invention static pressure reinforcing and processing method may further comprise the steps:
1) selects static pressure equipment
According to defective stake A, comprise the standard value F of the veritcal limit bearing capacity that castinplace pile or preformed pile design and the spacing of place situation and stake, select the be complementary model of static pile press of the standard value F of the veritcal limit bearing capacity that maximum pile driving pressure and stake design.
2) pile crown to the defective stake of bearing capacity A carries out necessary processing
As shown in Figure 1; To the defective stake of bearing capacity A; Excavate pile crown; Cut the loose concrete in top, the levelling of cast pea gravel concreten, pre-buried pile extension steel flanges dish; Welding is used for the spreading steel pipe of silent piling; Preformed pile is only needed be used in the stake top solder spreading steel pipe of silent piling, mark one observation point position on the spreading steel pipe, the spreading steel pipe must meet the Pile holding mechanism requirement of static pile press;
3) adopt static pressure equipment that the defective stake of bearing capacity A is carried out static pressure pile-sinking
As shown in Figure 2; The static pressure load is by the standard value F of the veritcal limit bearing capacity of designing requirement; Adopt the selected static pile press of step 1 that the defective stake of bearing capacity A is adopted hoop pressure mode; Promptly start electric oil pump; Through the anchor ear jack with spreading steel pipe banding, by means of the piling jack, with the standard value F (deadweight and counterweight) of the veritcal limit bearing capacity of pile press; Pass to defective stake A through the spreading steel pipe, carry out static pressure pile-sinking;
4) static pressure is pressed pile sinking again
In the static pressure process, the influence of come-up possibly arranged to defective stake A to squeeze soil because of static pressure.Therefore, observes static pressure its come-up situation after finishing a period of time.If defective stake A does not float then need not carry out static pressure and press again; Otherwise, if come-up appears in defective stake A, i.e. h＜H, as shown in Figure 3.Repeating step 3) process adopts static pile press still by the standard value F of the veritcal limit bearing capacity of designing requirement the underproof castinplace pile of bearing capacity or preformed pile to be carried out static pressure and presses again, tends towards stability until defective stake A sedimentation.
5) record, sign
After power to be lifted defective stake A (castinplace pile or preformed pile) presses settlement stability again, on the mark observation point position of spreading steel pipe, write down and indicate corresponding sedimentation value;
6) analyze the defective reason of pile capacity
According to the static pressure sedimentation record of step 5, press the classification of sedimentation value gradient, analyze the underproof reason of bearing capacity of defective stake A (castinplace pile or preformed pile);
7) pile extension is handled
Excavate the pile crown after the defective stake of static pressure A presses settlement stability again, remove piling spreading steel pipe, sedimentation value is adjusted cushion cap thickness at 100mm with interior employing; Sedimentation value is confirmed according to the cutting depth of having ready conditions at 100mm～5000mm, and is taked adjacent qualified stake safeguard measure; Avoid adjacent qualified stake being had a negative impact because of excavation; Adopt the reinforcing bar of the defective stake of spreading A, carry out the processing method of cast-in-place pile extension to former absolute altitude again, as shown in Figure 4.Sedimentation value is greater than 5000mm, and excavation can adopt common benefit stake to handle at need.
Because of settlement stability is pressed in stake again, and after after a while, general about needs 15～30 days, pile side friction is restored, and bearing capacity all can meet the demands with a stake sedimentation.
8) backfill compaction
At the bottom of pile extension excavation part was backfilled to cushion cap, the backfill compaction coefficient was 0.95.
The present invention provides the defective stake of a kind of bearing capacity static pressure reinforcing and processing method, is not mending under the situation, adopt static pressure equipment to bearing capacity defective stake carry out static pressure by design load, reach stable after, necessary processing is carried out in stake, make the bearing capacity of stake reach requirement.
Embodiment:
China's Southern Port Area mouth one multistory office, ground is in the weak soil zone, and new dashing filled out silt soil strata to reach 12m thick.The bottom be in close layer of sand and strong weathered granite layer, for eliminating the issuable pile foundation negative skin friction of pile, the thick sand cushion of 2m is laid on top, and has carried out the vacuum preloading ground stabilization and handled.According to the geology drilling data, select bored pile foundation for use, pile foundation adopts diameter 700mm, and bearing course at pile end is the strong weathered granite layer, and stake is about 25-31m, gets into strong weathered granite layer 5m, design single pile vertical resistance pressure limiting force 3400Kn.
Behind the filling pile construction, when carrying out static loading test, the test pile of choosing does not all reach designing requirement, and it is same that expanded scope is selected test pile once more, all do not reach designing requirement.This method is adopted in the back, adopts static pressure equipment that static pressure is carried out in whole stakes by design load and handles, comprise choice of equipment and march into the arena, and only with 3 days static pressure has been carried out in whole stakes, and is behind the stake settlement stability, that each the sedimentation value statistical classification that records is following:
1, is deposited in 50mm with interior 19.
2, be deposited in 50mm-100mm with interior 2.
3, be deposited in 100mm-1000mm with interior 2.
4, be deposited in 1000mm-2000mm with interior 1.
5, be deposited in 2000mm-3000mm with interior 6.
6, be deposited in 3000mm-4000mm with interior 8.
7, be deposited in 4000mm-5000mm with interior 5.
8, be deposited in 5000mm-6000mm with interior 4.
9,1 of sedimentation 6100mm.
10,1 of sedimentation 7300mm.
According to the statistical classification result, with the qualified basically stake of 21 interior piles, adopt adjustment cushion cap thickness to solve to sedimentation 100mm.
To sedimentation 100mm-3000mm with 9 interior piles, adopt the cushion cap excavation after, foundation trench is put after the step part deep-cuts, and defective stake is cut the loose concrete in top, the cast-in-situ concrete of spreading reinforcing bar formwork, the spreading stake solves.
To sedimentation 3000mm-5000mm with 13 interior piles, adopt the cushion cap excavation after, behind unit in charge of construction's excavating foundation trench, after adding the casing part and deep-cutting, defective stake is cut the loose concrete in top, the cast-in-situ concrete of spreading reinforcing bar formwork, the spreading stake solves.
Only 6 piles more than the sedimentation 5000mm being mended stake handles.
This project adopts this method duration short, small investment, and simple possible, responsibility is clear and definite, obtains owner's the satisfaction and the approval of other relevant unit.
The scope of application of the present invention is following:
1, sediment is excessive at the bottom of the hole of causing because of construction process of bored concrete pile or quality control defective, and stake side mud skin is blocked up, and effective length is not enough;
2, geological drilling data and actual engineering difference to some extent, soil layer are divided and are confirmed improperly, and the standard value of the pile side friction that provides is inaccurate with the standard value of stake bottom resistance, and bigger discrepancy is arranged;
When 3, preformed pile adopts power or static pressure pile-sinking, because of construction technology and Working Procedure Controlling defective cause a lifting, pile foundation come-up etc.
The present invention is not suitable for because of unit in charge of construction and uses inferior materials and turns out substandard goods and construction technology causes the pile quality insufficient strength, causes the processing of the defective stake of bearing capacity.Be not suitable for surveying unit's geological drilling data and actual engineering Geological Characteristics grave fault, have gross differences, stake lives forever in significant difference, causes the processing of the defective stake of bearing capacity.
Claims (1)
1. the defective stake of bearing capacity static pressure reinforcing and processing method may further comprise the steps:
(1) the static pressure equipment of selection stake
According to the standard value of the veritcal limit bearing capacity of castinplace pile or preformed pile design and the spacing of place situation and stake, the model of the static pile press that selection is complementary;
(2) pile crown of the defective stake of bearing capacity is handled
To the underproof castinplace pile of bearing capacity; Excavate pile crown; Cut the loose concrete in top; The levelling of cast pea gravel concreten; Pre-buried pile extension steel flanges dish, welding is used for the spreading steel pipe of silent piling, preformed pile is only needed to be used in the stake top solder spreading steel pipe of silent piling; Mark one observation point position on the spreading steel pipe, the spreading steel pipe must meet the Pile holding mechanism requirement of static pile press;
(3) static pressure pile-sinking
The static pressure load is by the standard value of the veritcal limit bearing capacity of designing requirement; Underproof castinplace pile of handling of bearing capacity or preformed pile adopt hoop pressure mode to carry out static pressure pile-sinking; Promptly start electric oil pump; Through the anchor ear jack with spreading steel pipe banding; By means of the piling jack; The deadweight and the counterweight of static pile press are passed to castinplace pile or preformed pile through the spreading steel pipe, carry out static pressure pile-sinking;
(4) static pressure is pressed pile sinking again
In the static pressure process,, therefore after static pressure finishes a period of time, observe its come-up situation, do not press again as if there being come-up then need not carry out static pressure owing to the influence that come-up possibly arranged stake because of the crowded soil of static pressure; Otherwise the process of repeating step (3) adopts static pile press still by the standard value of the veritcal limit bearing capacity of designing requirement the underproof castinplace pile of bearing capacity or preformed pile to be carried out static pressure and presses again, tends towards stability until the stake sedimentation;
(5) record, sign
After underproof castinplace pile of power to be lifted or preformed pile are pressed settlement stability again, on the mark observation point position of spreading steel pipe, write down and indicate corresponding sedimentation value;
(6) analyze the defective reason of pile capacity
According to the static pressure sedimentation record of step (5), press the classification of sedimentation value gradient, analyze the underproof reason of bearing capacity of castinplace pile or preformed pile;
(7) pile extension is handled
Press the classification of sedimentation value gradient, excavate castinplace pile or preformed pile pile crown after silent piling is pressed settlement stability again, remove the spreading steel pipe of silent piling, sedimentation value is adjusted cushion cap thickness at 100mm with interior employing; Sedimentation value adopts the reinforcing bar of spreading stake at 100mm～5000mm, carries out cast-in-place pile extension and handles; Sedimentation value adopts and mends the stake processing usually greater than 5000mm;
(8) backfill compaction
Pile extension excavation part to static pressure pile-sinking is carried out backfill, and until the cushion cap bottom, the backfill compaction coefficient is 0.95.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110220413 CN102352627B (en) | 2011-08-03 | 2011-08-03 | Static pressure reinforcing treatment method for pile with unqualified bearing capacity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110220413 CN102352627B (en) | 2011-08-03 | 2011-08-03 | Static pressure reinforcing treatment method for pile with unqualified bearing capacity |
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| CN102352627A true CN102352627A (en) | 2012-02-15 |
| CN102352627B CN102352627B (en) | 2013-08-07 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953041A (en) * | 2014-04-30 | 2014-07-30 | 王利华 | Method for improving bearing capacity of single pile of constructed foundation pile |
| CN106067100A (en) * | 2016-07-26 | 2016-11-02 | 广西汽车集团有限公司 | The ameliorative way of a kind of product quality and system |
| CN109372040A (en) * | 2018-09-05 | 2019-02-22 | 中国二十冶集团有限公司 | The processing method of the defect bored concrete pile in subgrade area |
| CN111794217A (en) * | 2020-07-23 | 2020-10-20 | 江西省地质工程(集团)公司 | Construction technology for treating bearing defects of cast-in-situ bored pile |
| CN112982518A (en) * | 2021-03-19 | 2021-06-18 | 云南建投第一勘察设计有限公司 | Construction method for forced compression reinforcement of static pressure pile machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11247186A (en) * | 1998-03-02 | 1999-09-14 | Nkk Corp | Pile-head concrete removing method and device for steel pipe pile filled with concrete |
| CN101135157A (en) * | 2006-10-28 | 2008-03-05 | 夏传清 | Static pressure pipe pile settling construction technique |
| CN102116025A (en) * | 2010-12-20 | 2011-07-06 | 东莞市桦业土木基础工程有限公司 | Reconstruction method for redriving or repressing PHC tubular pile |
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2011
- 2011-08-03 CN CN 201110220413 patent/CN102352627B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11247186A (en) * | 1998-03-02 | 1999-09-14 | Nkk Corp | Pile-head concrete removing method and device for steel pipe pile filled with concrete |
| CN101135157A (en) * | 2006-10-28 | 2008-03-05 | 夏传清 | Static pressure pipe pile settling construction technique |
| CN102116025A (en) * | 2010-12-20 | 2011-07-06 | 东莞市桦业土木基础工程有限公司 | Reconstruction method for redriving or repressing PHC tubular pile |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953041A (en) * | 2014-04-30 | 2014-07-30 | 王利华 | Method for improving bearing capacity of single pile of constructed foundation pile |
| CN106067100A (en) * | 2016-07-26 | 2016-11-02 | 广西汽车集团有限公司 | The ameliorative way of a kind of product quality and system |
| CN109372040A (en) * | 2018-09-05 | 2019-02-22 | 中国二十冶集团有限公司 | The processing method of the defect bored concrete pile in subgrade area |
| CN111794217A (en) * | 2020-07-23 | 2020-10-20 | 江西省地质工程(集团)公司 | Construction technology for treating bearing defects of cast-in-situ bored pile |
| CN112982518A (en) * | 2021-03-19 | 2021-06-18 | 云南建投第一勘察设计有限公司 | Construction method for forced compression reinforcement of static pressure pile machine |
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| CN102352627B (en) | 2013-08-07 |
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