CN106906816B - A method of improving soft soil foundation prefabricated pile effect of driving pile - Google Patents
A method of improving soft soil foundation prefabricated pile effect of driving pile Download PDFInfo
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- CN106906816B CN106906816B CN201710160392.1A CN201710160392A CN106906816B CN 106906816 B CN106906816 B CN 106906816B CN 201710160392 A CN201710160392 A CN 201710160392A CN 106906816 B CN106906816 B CN 106906816B
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- pile
- soft soil
- foundation
- prefabricated pile
- graded sand
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention belongs to foundation technical fields.A kind of method for improving soft soil foundation prefabricated pile effect of driving pile is provided, the foundation pit of 2m~4m depth is excavated on soft soil foundation, in hole bottom paving graded sand and is tamped, subsequent paving element soil is simultaneously successively tamped.Then setting-out and 1/2~2/3 times of long prebored hole of stake is drilled through, a part of duct is used as sand drain, and remaining a part is used as stake position preformed hole.Packed mixture is filled in sand drain, which is graded sand with the foam beads of partial size 5mm~7mm obtained by 3~5:1 is mixed by volume.After the completion of sand drain filling, prefabricated pile is pressed at remaining duct, and then complete construction.The present invention can effectively mitigate the pile interlocking problem that the soil compaction of weak soil piling generates；The duration is improved, lacks engineering and is limited by daily maximum piling number；Better construction environment is provided for the construction of pile foundation and superstructure；Construction cost is reduced, the cost performance of pile foundation construction is improved.
Description
Technical field
The invention belongs to field of foundation treatment, it is related to improving the method for soft soil foundation prefabricated pile effect of driving pile.
Background technique
With the intensive development of architecture ensemble on soft soil foundation, soft soil foundation situation to be processed is more and more.Because of hammer
The noise for sinking stake is big, is not suitable for urban area, therefore Static Pressure Precast Piles soft soil foundation is inevitably used in engineering.
Static pressure refers to prefabricated pile body static pressure entering the soil body, so that compacted soil, promotes the bearing capacity of ground.Static-pressure precast
The main harm that stake carries out basement process is that the soil compaction effect generated during piling, especially excess pore water pressure generate
Soil compaction effect easily makes existing pile interlocking, to influence Foundation Treatment Effect.
Conventional method is to mitigate soil compaction effect, passes through the measures such as improvement piling sequence, control piling speed, the anti-extrusion ditch of setting
Reduce soil pressure, but according to a large amount of case histories from the point of view of, especially on the sensitive weak soil band of some high-moisture percentages, the effect that does so
Fruit is not very significant.Engineering is limited by daily maximum piling number simultaneously, largely slows down the duration, and be difficult to effectively
Guarantee the quality of final entire engineering.
Summary of the invention
In order to improve the soil compaction effect for being directed to and generating during Static Pressure Precast Piles carry out basement process, traditional construction is improved
Technique further decreases the influence of soil compaction effect deviation caused by stake top.The invention proposes a kind of improvement soft soil foundation is prefabricated
The method of stake effect of driving pile.
The specific technical solution of the present invention is:
A method of improving soft soil foundation prefabricated pile effect of driving pile, includes the following steps:
The first step excavates surface layer weak soil, forms the foundation pit of 2~4m depth；
Second step in the graded sand of foundation pit bottom pine paving 300mm~500mm thickness, then is tamped, and ramming times are rammed by examination and determined,
The last two average deflections rammed control between 50mm~100mm；It then changes and fills out laminin soil, each pine paving 300mm~
500mm is thick, then tamps, until foundation pit top surface absolute altitude is equal to ground elevation；
Third step applies brill in the setting-out position of drainage hole, stake position preformed hole, and bore diameter takes brill having a size of 20~40cm
Hole depth is that 1/2~2/3 times of stake is long；
4th step after the completion of drilling, inserts the packed filler of column in sand drain hole；The packed filler is by with permeable
The mixture of the built-in graded sand of performance packaging bag and partial size 5mm~7mm foam beads composition, the volume of graded sand and foam beads
Than for 3~5:1；
5th step is pressed into prefabricated pile in the prefabricated pile position for being not filled by the packed filler of column, and then completes pressing pile construction.
Further, the graded sand accounts for 50% or more of gross weight for the content greater than 0.6mm particle, particle maximum grain
Diameter is no more than 10mm, and clay content is not more than 3%, and infiltration coefficient is not less than 5 × 10-2cm/s。
Further, the tensile strength with water permeability packaging bag is not less than 15KN/m, and infiltration coefficient is not less than 5
×10-2cm/s。
Further, described to have water permeability packaging bag for polypropylene textile bag.
Further, the graded sand in packed filler described in the 4th step is consistent with graded sand described in second step.
The invention has the advantages that:
First, it can effectively mitigate the pile interlocking that the soil compaction of weak soil piling generates；
Second, it can shorten the construction period, construction is enabled not limited by daily maximum piling quantity；
Third can provide better construction environment for the construction of pile foundation and superstructure；
4th, construction cost can be reduced, the cost performance of pile foundation construction is improved.
Detailed description of the invention
Attached drawing 1 is excavation of foundation pit schematic diagram；
Attached drawing 2 is place mat layer of sand schematic diagram；
Attached drawing 3 is bore position schematic diagram；
Attached drawing 4 is completion schematic diagram.
In figure: 1 area Huan Tian；2 Soft Soil Areas；3 earth's surfaces；4 layers of sand；5 position prebored holes；6 sand drain holes；7 existing prefabricated piles；8 fill out
The sand drain charged.
Specific embodiment
A specific embodiment of the invention is described in detail below in conjunction with technical solution (and attached drawing).
Embodiment 1
High-front shovel is utilized on construction ground, excavates out the foundation pit of 2m depth, as shown in Figure 1.Then, in hole bottom pine paving
The graded sand of 300mm thickness, in the graded sand, granule content of the diameter greater than 0.6mm accounts for the 60% of gross weight, clay content 2%, infiltration
Coefficient is 5 × 10-2Cm/s, as shown in Figure 2.It spreading and tamps layer of sand with diesel hammer after filling out, ramming times are rammed by examination and are determined, and last two
The average deflection rammed controls within the scope of 60 ± 10mm.Then it changes and fills out laminin soil, every laminin soil pine spreads 500mm, and place mat is complete
Cheng Houyong, which is pressed, tamps plain soil layer with compacting layer of sand same standard, and circulate operation is until complete the backfill of foundation pit.Then, allocation and transportation are bored
Hole machine enters construction site, applies brill in setting-out position.With the drill bit of diameter D=30cm when drilling, rate of penetration control is every small
When 1.5m.When drilling, pressure of the hole in the bottom is no more than the 70% of drilling rod, drill bit and counterweight summation.Drilling depth is taken as 2/3 times of stake
It is long.After drilling is completed, need with the packed filler of column is inserted in a part of duct for being used as sand drain, another part is used
Filling processing is not done in the duct for making the prebored hole of stake position, as shown in Figure 3.The column packaging bag for filling sand drain is selected with sufficiently strong
The tubular polypropylene packing bag of degree, diameter is equal with aperture, and packaging bag tensile strength is 15KN/m, and infiltration coefficient is 5 × 10- 2cm/s.Content in sand pocket is the homogeneous mixture of graded sand and partial size 5mm foam beads.3:1 by volume before filling
It is first uniformly mixed, is further filled with packaging bag, finally fill in the duct as sand drain again.After completing above-mentioned work, pile press machine is allocated and transported
It marches into the arena, prefabricated pile is pressed at the remaining duct as the prebored hole of stake position, final complete working hour is as shown in Figure 4.
Embodiment 2
In the region for requiring to carry out basement process, it is laid with steel plate below high-front shovel, scrapes out the base that depth is 4m
Hole, as shown in Figure 1.After the completion of excavation, in the graded sand of Foundation Pit bottom pine paving 500mm thickness.In the graded sand, diameter is greater than
The granule content of 0.6mm accounts for the 70% of gross weight, clay content 3%, and infiltration coefficient is 6 × 10-2cm/s.Paving is rammed after filling out with diesel hammer
Real layer of sand, ramming times are rammed by examination and are determined, the last two average deflections rammed control within the scope of 80 ± 20mm, as shown in Figure 2.
Then it changes and fills out laminin soil, every laminin soil pine spreads 300mm, and place mat tamps plain soil with by with compacting layer of sand same standard after the completion
Layer, circulate operation is until complete the backfill of foundation pit.Then, allocation and transportation drilling machine enters construction site, applies brill in setting-out position.Drilling
When with the drill bit of diameter D=40cm, rate of penetration is controlled in 1.2m per hour.When drilling, pressure of the hole in the bottom is no more than drilling rod, drill bit
With the 70% of counterweight summation.The stake that drilling depth is taken as 1/2 times is long.After drilling is completed, need in one as sand drain
Divide with the filling packed filler of column in duct, filling processing is not done in the duct that another part is used as the prebored hole of stake position, such as Fig. 3 institute
Show.The tubular polypropylene packing bag with sufficient intensity is selected in the column packaging bag for filling sand drain, and diameter is equal with aperture, packet
Pack tensile strength is 20KN/m, and infiltration coefficient is 6 × 10-2cm/s.Content in sand pocket is graded sand and partial size 7mm foam
The homogeneous mixture of particle.5:1 is first uniformly mixed by volume before filling, is further filled with packaging bag, is finally filled in again as sand
The duct of well.After completing above-mentioned work, allocation and transportation pile press machine is marched into the arena, and is pressed at the remaining duct as the prebored hole of stake position pre-
Stake processed.Final complete working hour is as shown in Figure 4.
Claims (8)
1. a kind of method for improving soft soil foundation prefabricated pile effect of driving pile, which comprises the steps of:
The first step excavates surface layer weak soil, forms the foundation pit of 2m ~ 4m depth；
Second step in the graded sand of foundation pit bottom pine paving 300mm ~ 500mm thickness, then is tamped, and ramming times are rammed by examination and determined, and last two
The average deflection rammed controls between 50mm ~ 100mm；It then changing and fills out laminin soil, 300 mm of pine paving ~ 500mm is thick every time,
It tamps again, until foundation pit top surface absolute altitude is equal to ground elevation；
Third step applies brill in the setting-out position of drainage hole, stake position preformed hole, and bore diameter is having a size of 20 ~ 40cm, drilling depth
1/2 ~ 2/3 times of prefabricated pile stake is long；
4th step after the completion of drilling, inserts the packed filler of column in drainage hole；The packed filler of the column is by with permeable
The packaging bag of performance and the mixture composition in the packaging bag, the mixture is by graded sand and partial size 5mm ~ 7mm foam beads
The volume ratio of composition, graded sand and foam beads is 3 ~ 5:1；
5th step is pressed into prefabricated pile, and then complete pressing pile construction in the stake position preformed hole for being not filled by the packed filler of column.
2. a kind of method for improving soft soil foundation prefabricated pile effect of driving pile according to claim 1, which is characterized in that
Content in the graded sand greater than 0.6mm particle accounts for 50% or more of gross weight, and particle maximum particle diameter is no more than 10mm, contains
Mud amount is not more than 3%, and infiltration coefficient is not less than 5 × 10-2cm/s。
3. a kind of method for improving soft soil foundation prefabricated pile effect of driving pile according to claim 1 or 2, feature exist
In the tensile strength with water permeability packaging bag is not less than 15KN/m, and infiltration coefficient is not less than 5 × 10-2cm/s。
4. a kind of method for improving soft soil foundation prefabricated pile effect of driving pile according to claim 1 or 2, feature exist
In the graded sand in the packed filler of column described in the 4th step is consistent with graded sand described in second step.
5. a kind of method for improving soft soil foundation prefabricated pile effect of driving pile according to claim 3, which is characterized in that
Graded sand in the packed filler of column described in 4th step is consistent with graded sand described in second step.
6. a kind of method of improvement soft soil foundation prefabricated pile effect of driving pile described according to claim 1 or 2 or 5, special
Sign is, described to have water permeability packaging bag for polypropylene textile bag.
7. a kind of method for improving soft soil foundation prefabricated pile effect of driving pile according to claim 3, which is characterized in that
It is described to have water permeability packaging bag for polypropylene textile bag.
8. a kind of method for improving soft soil foundation prefabricated pile effect of driving pile according to claim 4, which is characterized in that
It is described to have water permeability packaging bag for polypropylene textile bag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710160392.1A CN106906816B (en) | 2017-03-17 | 2017-03-17 | A method of improving soft soil foundation prefabricated pile effect of driving pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710160392.1A CN106906816B (en) | 2017-03-17 | 2017-03-17 | A method of improving soft soil foundation prefabricated pile effect of driving pile |
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| Publication Number | Publication Date |
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| CN106906816A CN106906816A (en) | 2017-06-30 |
| CN106906816B true CN106906816B (en) | 2019-05-03 |
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| CN201710160392.1A Expired - Fee Related CN106906816B (en) | 2017-03-17 | 2017-03-17 | A method of improving soft soil foundation prefabricated pile effect of driving pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA3188126A1 (en) * | 2020-06-23 | 2021-12-30 | Ramesh Chandra Gupta | Rapid consolidation and compaction method for soil improvement of various layers of soils and intermediate geomaterials in a soil deposit |
| CN113279408A (en) * | 2021-05-13 | 2021-08-20 | 广东省珠海工程勘察院 | Method for carrying out engineering pile construction at bottom of deep soft soil foundation pit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10237856A (en) * | 1997-02-27 | 1998-09-08 | Shimizu Corp | Construction mehtod for soil improvement using both pile and sand compaction pile |
| CN101806055A (en) * | 2009-02-13 | 2010-08-18 | 梁闽 | Vacuum pre-pressed joint rigid pile composite foundation reinforcing method |
| CN103195051A (en) * | 2013-03-27 | 2013-07-10 | 山东大学 | Limestone soil and pervious concrete pile composite foundation and treatment method thereof |
| CN104060601A (en) * | 2014-04-25 | 2014-09-24 | 上海岩土工程勘察设计研究院有限公司 | Construction method utilizing pile foundations of precast construction piles for ground treatment |
| CN104153383A (en) * | 2014-08-08 | 2014-11-19 | 中建五局土木工程有限公司 | Marine facies soft soil foundation structure and processing method thereof |
| CN204356594U (en) * | 2014-11-24 | 2015-05-27 | 中铁二院工程集团有限责任公司 | Non-fragment orbit expensive soil cutting-bedding construction |
-
2017
- 2017-03-17 CN CN201710160392.1A patent/CN106906816B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10237856A (en) * | 1997-02-27 | 1998-09-08 | Shimizu Corp | Construction mehtod for soil improvement using both pile and sand compaction pile |
| CN101806055A (en) * | 2009-02-13 | 2010-08-18 | 梁闽 | Vacuum pre-pressed joint rigid pile composite foundation reinforcing method |
| CN103195051A (en) * | 2013-03-27 | 2013-07-10 | 山东大学 | Limestone soil and pervious concrete pile composite foundation and treatment method thereof |
| CN104060601A (en) * | 2014-04-25 | 2014-09-24 | 上海岩土工程勘察设计研究院有限公司 | Construction method utilizing pile foundations of precast construction piles for ground treatment |
| CN104153383A (en) * | 2014-08-08 | 2014-11-19 | 中建五局土木工程有限公司 | Marine facies soft soil foundation structure and processing method thereof |
| CN204356594U (en) * | 2014-11-24 | 2015-05-27 | 中铁二院工程集团有限责任公司 | Non-fragment orbit expensive soil cutting-bedding construction |
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