CN109371954A - A kind of construction method of PHC tubular pole consolidation draining system in soft soil foundation - Google Patents
A kind of construction method of PHC tubular pole consolidation draining system in soft soil foundation Download PDFInfo
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- CN109371954A CN109371954A CN201811252592.0A CN201811252592A CN109371954A CN 109371954 A CN109371954 A CN 109371954A CN 201811252592 A CN201811252592 A CN 201811252592A CN 109371954 A CN109371954 A CN 109371954A
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- tubular pole
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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
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a kind of construction method of PHC tubular pole consolidation draining system in soft soil foundation, thickness is big, in foundation in saturated soft soil of bad hydraulic permeability, drainage system is arranged；The drainage system includes horizontal row water body and vertical drainage body, and horizontal row water body is french drain, and vertical drainage body uses prebored hole placing sand drain on the spot；Construction of Static Pressure Pile is carried out after reasonable Arrangement drainage system, through stake position survey set, hang stake feed stake after by PHC tubular pole align piles position after carry out piling, under the soil compaction effect effect that the PHC tubular pole sunk to generates, pore water generation pressure difference and seepage flow in weak soil, horizontal row water body is flowed by vertical drainage body, is discharged by water plug；Pile extension, pile follower and whole stake are carried out after the completion of piling, and PHC tubular pole is made to be fixedly arranged at soft soil foundation.Construction method of the invention has the characteristics that vertical bearing capacity of single pile is high, stake number is few, low cost, construction efficiency height, reliable construction quality, Defect Piles are few, economical rationality, with good social benefit.
Description
Technical field
The present invention relates to technical field of building construction, in particular to a kind of PHC tubular pole consolidation draining system in soft soil foundation
The construction method of system.
Technical background
Coastal and hinterland it is widely distributed marine facies, lacustrine facies and river facies deposition weak stickiness soil layer, this soil
Feature is that water content is big, compressibility is high, intensity is low, bad hydraulic permeability but basement rock bury shallower (about 10m~20m), using prestressing force
The available preferable economic benefit in concrete tubular pile (PHC tubular pole) basis simultaneously can guarantee construction quality.PHC tubular pole presses pile sinking side
The difference of method can be divided into hammering method and two kinds of static pressure method.Static press piling is anti-by the counterweight on pressing machine self weight and pile frame
Power overcomes pile peripheral friction force and pile top bearing capacity, and PHC tubular pole is pressed into soil to projected depth.
Compared with traditional hammering method, static pressure method has construction noiseless, without friction, pollution-free, and speed of application is fast, to week
The advantages that enclosing that environmental disturbances are small, being not likely to produce bias.But it also has certain limitation, is mainly reflected in the following aspects:
(1) when carrying out construction of Static Pressure Pile in being saturated weak stickiness soil layer, easily there is deviation of pipe pile, inclination or even pile breaking phenomenon；(2)
Weak stickiness thicker soil, easily there is pile body inclining deviation, soil due to being influenced by accumulation soil compaction effect in pile body when static pressure is constructed
Body protuberance forms floating stake；(3) often stratification is distributed and often accompanies dense sand stratum the clay layer of modern ground, and static press piling is more difficult
It passes through, an end is easily caused to enter the illusion of supporting course, cause construction quality hidden danger.
Summary of the invention
The purpose of the present invention is to solve quality problems existing for above-mentioned saturation Soft Clay Foundation construction of Static Pressure Pile, provide
A kind of construction method of PHC tubular pole consolidation draining system in soft soil foundation, this method have speed of application it is fast, it is safe and reliable,
The outstanding features such as at low cost, quality controllable, economic benefit are obvious.
The technical solution of the present invention is as follows: a kind of construction method of PHC tubular pole consolidation draining system in soft soil foundation, including
Following steps:
(1) thickness is big, in foundation in saturated soft soil of bad hydraulic permeability, drainage system is arranged；The drainage system includes horizontal row
Water body and vertical drainage body, horizontal row water body are french drain, and vertical drainage body uses prebored hole placing sand drain on the spot；
(2) construction of Static Pressure Pile is carried out after reasonable Arrangement drainage system, is surveyed through stake position and sets, hangs PHC tubular pole align piles after stake is fed in stake
Piling is carried out behind position, under the soil compaction effect effect that the PHC tubular pole sunk to generates, pore water generation pressure difference and seepage flow in weak soil,
Horizontal row water body is flowed by vertical drainage body, is discharged by water plug；Pile extension, pile follower and whole stake are carried out after the completion of piling, are made
PHC tubular pole is fixedly arranged at soft soil foundation.
Further, sump is provided with below the horizontal row water body.
Further, it is coarse sand that the french drain, which fills out core material, and the sand drain is coarse sand filling；It is greater than in the coarse sand
The content of 0.5mm sand preferably accounts for 50% or more of gross weight, and clay content is not more than 3%, and infiltration coefficient is not less than 5 × 10-2cm/s。
Further, the sand drain is set at non-stake position, and the diameter of sand drain is 0.4~0.6m, and center spacing is 0.3~
0.5m, depth are determined according to the distribution situation of soil layer；After the completion of sand drainage construction, vertical and horizontal french drain, french drain are set at the top of sand drain
Having a size of 400mm × 800mm.
Further, the strength grade of the PHC tubular pole is not less than C80, guarantees that the capability and performance of PHC tubular pole is up to standard.
The beneficial effects of the present invention are: the construction method of PHC tubular pole consolidation draining system in soft soil foundation of the invention,
In addition to the common process with static press piling, also have the following characteristics that
1, static pressure PHC tubular pole will generate stake week soil compaction effect, and the soil body pore water edge of soil compaction coverage is set in ground in advance
The drainage channel set constantly is discharged, and drainage channel shortens the flowing distance of pore water, accelerates foundation soil consolidation process；
2, with the continuous discharge of pore water, the piling soil compaction effect of deep clay layer obviously weakens, in the inclination of pile body deviation, the soil body
Grand, floating stake phenomenon is effectively controlled；
3, under the action of pile press machine self weight and counterweight, the discharge of soil body pore water is accelerated, the soil solidifying time is shortened；
Closely knit skerry is smoothly also passed through for tubular pole provides guarantee simultaneously.
Detailed description of the invention
Fig. 1 is arrangement of Drainage figure.
Appended drawing reference: horizontal row water body 1, vertical drainage body 2, sump 3.
Specific embodiment
A kind of construction method of PHC tubular pole consolidation draining system in soft soil foundation of the invention, the following steps are included:
(1) thickness is big, in foundation in saturated soft soil of bad hydraulic permeability, drainage system is arranged；As shown in Figure 1, the drainage system
Including horizontal row water body 1 and vertical drainage body 2, horizontal row water body 1 is french drain, and vertical drainage body 2 uses prebored hole placing on the spot
Sand drain, topography lower setting sump 3 are connected with french drain, and french drain and vertical drainage body 2 are connected to form good drainage system；
Wherein, according to the requirement of the consolidation characteristics of soil and construction time limit, the diameter of sand drain takes 0.40m, and sand drain center spacing takes 4.0m, sand
The depth of well determines that, when Soft Soil Layer is not thick or pervious bed is arranged at bottom, sand drain should be as far as possible according to the distribution situation scene of soil layer
Soft Soil Layer is penetrated, when having layer of sand between deep compression soil layer, sand drain should be beaten as far as possible to layer of sand.The position of sand drain is located at non-stake
Position place, the spacing of sand drain can carry out appropriate adjustment encryption according to on-site actual situations, and unsuitable well spacing tunes up, and influence to consolidate and imitate
Fruit.It is coarse sand that the french drain, which fills out core material, and the sand drain is coarse sand filling；Content in the coarse sand greater than 0.5mm sand preferably accounts for
50% or more of gross weight, clay content are not more than 3%, and infiltration coefficient is not less than 5 × 10-2Cm/s, after the completion of sand drainage construction, sand drain top
Similar netted vertically and horizontally french drain is arranged in portion's horizontal direction, and french drain is having a size of 400mm × 800mm.
(2) construction of Static Pressure Pile is carried out after reasonable Arrangement drainage system, is surveyed through stake position and sets, hangs PHC tubular pole pair after stake is fed in stake
Piling is carried out behind quasi- stake position, under the soil compaction effect effect that the PHC tubular pole sunk to generates, the pore water in weak soil generates pressure difference and seeps
Stream flows into horizontal row water body 1 by vertical drainage body 2, and continuous seepage flow is discharged into sump 3, by utilizing water pump constantly by sump
In water pump drainage to place outside；Pile extension, pile follower and whole stake are carried out after the completion of piling, and PHC tubular pole is made to be fixedly arranged at soft soil foundation.
Technological principle of the invention is as follows:
1, saturation Soft Clay Foundation indentation PHC tubular pole generate soil compaction effect effect under, soil in pore water generate pressure difference and
Seepage flow discharge, pore volume reduce at leisure, and consolidation deformation occurs for ground.Meanwhile as excess pore water pressure dribbles,
Soil body effective stress is gradually increased, and the intensity of foundation soil gradually increases.
2, the discharging consolidation effect of soil layer is related with its Brainage boundary condition.According to consolidation theory, cohesive soil consolidates institute
Time for needing and drainage distance it is square directly proportional, soil layer is thicker, and the time for consolidating continuity is longer.In order to accelerate consolidating for soil layer
Knot, most efficient method are the draining water ways for increasing soil layer pore water, shorten drainage distance.
3, thickness is big, water penetration very poor saturated soft clay again, need to be constituted simultaneously with horizontal row water body and vertical drainage body
Drainage system makes soil layer pore water flow into horizontal row water body by vertical drainage body.Vertical drainage body is using placing sand drain on the spot, water
Flat raft water body uses coarse sand french drain.Pore water in soil is under the soil compaction effect effect that indentation PHC tubular pole generates by drainage system
Constantly discharge, to eliminate part excess pore water pressure, to make to be saturated Soft Clay Foundation discharging consolidation.
4, it dribbles with soil layer excess pore water pressure, the extrusion stress that static pressure pipe pile generates also is divided in drainage system
At each zonule in be released, not will cause the accumulation of extrusion stress, to realize that soil compaction effect obviously weakens, pile body
Grand, floating stake phenomenon is effectively controlled in deviation inclination, the soil body.
Construction method of the invention is suitable for saturation soft clay, Muddy Bottoms clay, loose silt, Recently deposited soil, organic
The static press piling construction of the soft soil foundations such as matter soil and peat soil.
Soft Clay Foundation is saturated after discharging consolidation, static pressure PHC tubular pole obtains biggish soil around pile ultimate frictional resistance,
By proving under the conditions of the identical geology of test the test of 12 piles, vertical bearing capacity of single pile is set to improve about 20%, data such as table
1, the PHC stake quantity in raft plate reduces about 16%, and cost reduces 13%.With static pressed pile quantity in the raft plate of a high-rise residential building
Economic analysis is carried out, data are as shown in table 2.
1 vertical bearing capacity of single pile test data contrast table of table
2 Economic and Efficiency Analysis table of table
By taking Beihai Fisheries Base Guangxi Province A cell static pressed pile engineering construction as an example, project PHC tubular pole diameter 500mm, stagnation pressure pile length is
21000 linear meter(lin.m.)s, stake holes is 1125 total, and the average long 18m of stake, vertical bearing capacity of single pile characteristic value is 1600kN.This engineering uses
" construction method of PHC tubular pole consolidation draining system in soft soil foundation of the invention " constructs, the through Construction Party's commission
The detection of tripartite testing agency carries out dead-load detection to 12 piles, this 12 pile ultimate bearing capacity average value is 1926kN, to 350
Stake carries out low strain integrity testing, test result are as follows: 338 piles are I class stake, account for the 96.6% of detection stake sum；12 piles are II class
Stake accounts for the 3.4% of detection stake sum, meets design requirement.The project practice of construction duration shifts to an earlier date 7 days compared with time limit for contract.
Guangxi coastal areas is largely soft soil foundation, and the buried depth of hard stratum is on underground 20m or so, most of stratum
For saturability clay and Extra-fine sand alternating layers, bearing capacity is about 100kPa, and compressibility is larger.Under this geological conditions, this area
Small high-rise, high-rise basis must all use pile foundation substantially, and by all kinds of pile foundations in technology, economic aspect
Compare, PHC tubular pole of the invention is fixedly arranged at the construction method of soft soil foundation, with vertical bearing capacity of single pile is high, stake number is few, cost
Low, the features such as construction efficiency is high, reliable construction quality, Defect Piles are few, economical rationality, there is good social benefit.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
The variation or simple replacement expected without creative work, should all be included within the scope of the present invention.
Claims (5)
1. a kind of construction method of PHC tubular pole consolidation draining system in soft soil foundation, which comprises the following steps:
(1) thickness is big, in foundation in saturated soft soil of bad hydraulic permeability, drainage system is arranged；The drainage system includes horizontal row
Water body and vertical drainage body, horizontal row water body are french drain, and vertical drainage body uses prebored hole placing sand drain on the spot；
(2) construction of Static Pressure Pile is carried out after reasonable Arrangement drainage system, is surveyed through stake position and sets, hangs PHC tubular pole align piles after stake is fed in stake
Piling is carried out behind position, under the soil compaction effect effect that the PHC tubular pole sunk to generates, pore water generation pressure difference and seepage flow in weak soil,
Horizontal row water body is flowed by vertical drainage body, is discharged by water plug；Pile extension, pile follower and whole stake are carried out after the completion of piling, are made
PHC tubular pole is fixedly arranged at soft soil foundation.
2. the construction method of PHC tubular pole consolidation draining system in soft soil foundation according to claim 1, feature exist
In: sump is provided with below the horizontal row water body.
3. the construction method of PHC tubular pole consolidation draining system in soft soil foundation according to claim 1, feature exist
In: it is coarse sand that the french drain, which fills out core material, and the sand drain is coarse sand filling；Content in the coarse sand greater than 0.5mm sand preferably accounts for
50% or more of gross weight, clay content are not more than 3%, and infiltration coefficient is not less than 5 × 10-2cm/s。
4. the construction method of any PHC tubular pole consolidation draining system in soft soil foundation according to claim 1~3,
Be characterized in that: the sand drain is set at non-stake position, and the diameter of sand drain is 0.4~0.6m, and center spacing is 0.3~0.5m, depth
It is determined according to the distribution situation of soil layer；After the completion of sand drainage construction, vertical and horizontal french drain is set at the top of sand drain, french drain having a size of
400mm×800mm。
5. the construction method of PHC tubular pole consolidation draining system in soft soil foundation according to claim 1, feature exist
In: the strength grade of the PHC tubular pole is not less than C80.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811252592.0A CN109371954A (en) | 2018-10-25 | 2018-10-25 | A kind of construction method of PHC tubular pole consolidation draining system in soft soil foundation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811252592.0A CN109371954A (en) | 2018-10-25 | 2018-10-25 | A kind of construction method of PHC tubular pole consolidation draining system in soft soil foundation |
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| CN109371954A true CN109371954A (en) | 2019-02-22 |
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| CN201811252592.0A Pending CN109371954A (en) | 2018-10-25 | 2018-10-25 | A kind of construction method of PHC tubular pole consolidation draining system in soft soil foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047219A (en) * | 2021-04-13 | 2021-06-29 | 中国电力工程顾问集团西南电力设计院有限公司 | Foundation of soft soil foundation ash field initial dam and foundation construction method |
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|---|---|---|---|---|
| CN202718084U (en) * | 2012-08-23 | 2013-02-06 | 越烽建设集团有限公司 | Composite foundation with flexible piles and drain boards combined |
| CN104032726A (en) * | 2013-03-04 | 2014-09-10 | 五邑大学 | Post-grouting capped rigid pile and drainage unit combined foundation treatment technology |
| CN105002882A (en) * | 2014-04-23 | 2015-10-28 | 天津市北洋水运水利勘察设计研究院有限公司 | Transverse draining channel with longitudinal and transverse latticed drainage blind ditches and seepage collecting well points |
| CN107268581A (en) * | 2017-08-21 | 2017-10-20 | 广东省水利电力勘测设计研究院 | A kind of method that lateral soil compaction discharging consolidation improves Squeezing Soil Pile pile foundation performance |
| CN107916662A (en) * | 2017-11-28 | 2018-04-17 | 武汉大学 | Soft foundation discharge fixing method |
-
2018
- 2018-10-25 CN CN201811252592.0A patent/CN109371954A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202718084U (en) * | 2012-08-23 | 2013-02-06 | 越烽建设集团有限公司 | Composite foundation with flexible piles and drain boards combined |
| CN104032726A (en) * | 2013-03-04 | 2014-09-10 | 五邑大学 | Post-grouting capped rigid pile and drainage unit combined foundation treatment technology |
| CN105002882A (en) * | 2014-04-23 | 2015-10-28 | 天津市北洋水运水利勘察设计研究院有限公司 | Transverse draining channel with longitudinal and transverse latticed drainage blind ditches and seepage collecting well points |
| CN107268581A (en) * | 2017-08-21 | 2017-10-20 | 广东省水利电力勘测设计研究院 | A kind of method that lateral soil compaction discharging consolidation improves Squeezing Soil Pile pile foundation performance |
| CN107916662A (en) * | 2017-11-28 | 2018-04-17 | 武汉大学 | Soft foundation discharge fixing method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047219A (en) * | 2021-04-13 | 2021-06-29 | 中国电力工程顾问集团西南电力设计院有限公司 | Foundation of soft soil foundation ash field initial dam and foundation construction method |
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Application publication date: 20190222 |