CN1224786A - Composite foundation with short piles and its construction process - Google Patents
Composite foundation with short piles and its construction process Download PDFInfo
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- CN1224786A CN1224786A CN 98125248 CN98125248A CN1224786A CN 1224786 A CN1224786 A CN 1224786A CN 98125248 CN98125248 CN 98125248 CN 98125248 A CN98125248 A CN 98125248A CN 1224786 A CN1224786 A CN 1224786A
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- 239000002131 composite material Substances 0.000 title claims abstract description 29
- 238000010276 construction Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title abstract description 5
- 230000008569 process Effects 0.000 title abstract description 3
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 239000004576 sand Substances 0.000 claims description 14
- 238000005516 engineering process Methods 0.000 claims description 10
- 239000004575 stone Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 238000012552 review Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 5
- 238000007689 inspection Methods 0.000 abstract description 4
- 238000000151 deposition Methods 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 40
- 239000004927 clay Substances 0.000 description 16
- 238000013461 design Methods 0.000 description 12
- 239000002689 soil Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 230000001595 contractor effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 241000256856 Vespidae Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Abstract
The short piles in the composite foundation have length of 1.2-5.0m, interval between piles equal 1-3 times pile diameter, protecting pile length of 0.2-0.3 m and hard layer at the end; are made of CFG material in the strength grade of C10 or C15 and without pumping agent, and have pile area replacement rate of 10-30%. The construction process of the composite foundation includes the steps of positioning the piles, drilling holes and tamping the bottom of holes, preparing and depositing the CFG material and forming piles through vibration, and inspection. The new type composite foundation with short piles of the present invention can meet the requirement in bearing capacity and final sedimentation amount in low cost.
Description
The present invention relates to building foundation treating method, the particularly a kind of novel long-short pile composite foundation and the construction technology thereof that are applicable to multilayer or high-rise building and the processing of structure ground.
At present, the method of building trade Ground Treatment mostly is the long pile composite foundation of CFG, so-called CFG stake promptly in the broken stone pile pile body an amount of aggregate chips of admixture, flyash and cement add water and mix and stir the higher pile body of making of a kind of adhesion strength, be referred to as CFG, be called for short the CFG stake.Hold friction pile from force mechanism for friction pile or end, for example the Beijing area is applied to the Ground Treatment of High-rise Buildings of 20-30 layer, long being generally more than 6 meters of stake, and long reaches 18 meters to 20 meters; Pile spacing is generally doubly stake diameter of 3-6; Construction technology is used " superfluidity " technology more, with mesopore long-spiral drilling machine pore-forming, presses the technology of CFG material pile with concrete pump.Another kind of technology is long screw auger power traction hole, vibration sinking tube perfusion CFG material pile-formation process.Its CFG strength grade is many at C
20More than.
The long pile composite foundation of this CFG more than using, ubiquitous problem are problems such as cost height, the difficult control of construction quality.
The purpose of this invention is to provide that a kind of cost is low, bearing capacity of foundation soil is very easily controlled and be well positioned to meet to construction quality and the CFG long-short pile composite foundation of final settlement requirement.
Composite foundation with short piles of the present invention comprises and adopts CFG material and stake long the protection stake is long be 0.2-0.3m for 1.2-5.0m, pile spacing are doubly stake diameter of 1-3 that CFG expects that strength grade is C
10Or c
15, and do not mix pumping admixture, and the area replacement ratio that lays out pile is 10-30%, the stake end is provided with solid bed.
The TT skill of executing of novel C FG long-short pile composite foundation of the present invention comprises the fixed stake of first unwrapping wire position; pore-forming when the CFG material is stirred; and with compacting at the bottom of the hole; then with the cast of qualified CFG material, pile vibrates; and control stake top mark height; review, it is long to chisel out the protection stake then, lays thick medium coarse sand of 10-30cm or graded sand and stone mattress layer again.
The time should note in construction: during the fixed stake of unwrapping wire position, checks errorless after, can begin to construct; Material therefor cement, stone, flyash, (sand) are except that having product certificate, and the retrial of must sampling can be used after qualified; With long-spiral drilling machine or artificial luoyang spade pore-forming, strict control aperture, verticality, hole depth, the degree of depth that enters bearing course at pile end are wanted place under repair when the degree of depth is not enough; Will carry out behind the pore-forming tamping at the bottom of the hole, hammer ram weight generally is not less than 35kg, a hole bottom perimeter month type tamping; CFG material mix carries out (or carry out at agitator) at the scene with mixer, tries to join according to the proportioning that the test of match ratio request slip is determined, examination can formally be opened the set after cooperating lattice; Can deliver to the end, hole with conduit when in the hole, constructing, deliver to the aperture with trolley; Whether clean at the bottom of the check hole before every pile is poured into a mould, get final product the placed hole buccal funnel after affirmation is clean, pour into from the aperture funnel during cast CFG material, surpass 2 meters palpuses with conduit or tumbling barrel as hole depth, vibrate with vibrating spear while pouring into a mould, guarantee that pile body is closely knit, the stake of " hornet's nest " formula can not occur; Control stake top mark height stays the long 20-30cm of protection stake when being poured into the aperture; Carry out the construction original record, review by construction note again behind the pile, avoid Lou stake; It is long to chisel out the protection stake, lays thick medium coarse sand of 10-30cm or graded sand and stone mattress layer.
The CFG long-short pile composite foundation is compared with the long pile composite foundation of widely using now of CFG, and following 9 tangible differences are arranged:
1, design phiolosophy: " long stake " is that " it is theoretical to dredge stake " promptly dredged and grown, and well utilizes inter-pile soil to bear the upper vertical load; " stub " closely lack for " close stake theoretical " is, with relatively large area replacement ratio, makes pile carry on a shoulder pole more upper vertical load, and pile soil common action reaches the bearing capacity of upper load needs.
2, stake is long: the stake of " long stake " is long many more than 6 meters, in addition stake long have reach 16 meters to 20 meters; The stake of " stub " is long many below 6 meters.
3, replacement ratio: " long stake " the area replacement ratio that lays out pile generally is not more than 10%; " stub " lays out pile the area replacement ratio generally greater than 10%.
4, pile spacing: pile spacing is generally doubly stake diameter of 3-6 during " long stake " layout; Pile spacing was generally doubly stake diameter of 1-3 when " stub " arranged.
5, CFG material strength grade: " long stake " CFG material strength grade generally all is higher than C
20, and many admixtures pumping admixture; " stub " CFG material strength grade is generally used C more
10, C
15, and do not mix pumping admixture.
6, the long length of protection stake: the long 0.5-0.7m that is generally of " long stake " protection stake; The long 0.2-0.3m that is generally of " stub " protection stake.
7, the stressed mechanism of action: " long stake " mostly is friction pile or end holds friction pile, and the stake end can not have solid bed; " stub " based on end bearing pile, the stake end must have solid bed, can not be soft layer.
8, construction technology: " long stake " is many with " superfluidity " technology, promptly use mesopore long-spiral drilling machine pore-forming, with concrete pump pressure injection CFG material pile, or long screw auger power traction hole, " stub " is many with long-spiral drilling machine pore-forming or artificial luoyang spade pore-forming, CFG material is poured into a mould in compacting at the bottom of the hole afterwards, and with vibrating spear vibration compacting pile.
9, economy: " long stake " processed in units area cost is higher; " stub " cost by contrast is comparatively cheap.Same building thing ground is handled, generally speaking " stub " than " long stake " but cost saving 20-60%.For example " residential quarters, Beiyuan " building (ground 25 floor, underground 2 layers) ground disposal cost, 800,000 yuan of " long stake " quotations, and " stub " quotation only is 320,000 yuan, saving 60%; And for example " Headquarters of the General Staff Da Tun residential district " building (ground 24 floor, underground 2 layers) ground disposal cost, 750,000 yuan of " long stake " lowest bids, and " stub " quotation is 450,000 yuan, saves 40%.
Novel C FG long-short pile composite foundation of the present invention is scientific and reasonable, has the requirement that construction quality is good, can satisfy design bearing capacity, also can satisfy the characteristics such as requirement of final settlement, particularly this kind ground cost is low, compare with past " long pile composite foundation " scheme commonly used, can save the expense of 20-60%.
Further describe the present invention below in conjunction with embodiment
Embodiment 1:
Certain residential quarters residential building ground is handled, and residential building is 25 layers on the ground, and underground 2 layers, the frame-shear wall structure, embedded depth of foundation is-8m that strata condition is from top to bottom:
1 layer is the artificial earth fill, and clay silt plain fill, thickness are 2.7m;
2 layers is clay silt;
The 3 layers of silty clay of attaching most importance to, silty clay;
4 layers is silty clay, clay silt;
5 layers is the powder fine sand, 51 layers of local distribution of medium coarse sand;
6 layers is clay silt.
Depth to water for satisfying soil excavation and doing the requirement of CFG stake, is reduced to 5 layers of top board below 1 meter with water level about 3 meters.
By earthquake intensity 8 degree designs, establish the place foundation soil and do not have the liquefaction possibility.
Comprehensive above condition through multiple scheme relatively, has been selected safety, economically and reasonably little spacing for use, paxilla footpath, low-grade CFG long-short pile composite foundation scheme, stake footpath 400mm, pile spacing 900mm, 4 layers of natural foundation bearing capacity standard value f
k=180kp
a, the CFG strength grade is C
10, stake progress is gone into layer of sand 0.5m, the long 2.5-3.6m of stake.Handle the back nominal value of bearing capacity of composite foundation and be not less than 350kp
a, the Bearing Capacity of Composite Foundation design load is not less than 420kp after degree of depth correction
a, bearing capacity of single pile is designed to 141.8KN.
Final settlement adopts different specification (rules) to calculate and is respectively 83.27mm and 124.91mm, all satisfies code requirement; Mattress bed thickness 20cm adopts graded sand and stone.
Through finishing the CFG long-short pile composite foundation construction in two buildings in 27 days, afterwards by Beijing prospecting engineering company of Chinese geological mapping technology institute, composite foundation to two buildings detects, two buildings detect 2 groups of Pile Composite Foundation altogether, 6 groups of single pile load tests, low deformation dynamic inspection 212 piles, qualification rate 100% meets design requirement.
The settlement observation result is after 4-01 building 25 floor top out, to add up settling amount maximum (3
#Point) 22.6mm, minimum (11
#Point) 18.5mm, 13 average 19.2mm of observation point; 4-02 building 25 floor top out, accumulative total settling amount maximum (1
#Point) 30.4mm, minimum (7
#Point) 19.0mm, 12 average 25.22mm of observation point.
Embodiment 2
Certain residential building ground is handled, and residential building is 24 layers on the ground, and underground 2 layers, frame is cut full cast-in-place structural, box foundation, and substrate buried depth-8.81m, designing requirement Bearing Capacity of Composite Foundation design load reaches 450kp
a, final settlement is not more than 8cm.
Strata condition is from top to bottom:
1 layer for artificial accumulation horizon: silty clay banket 1 layer and room dregs 1
1Layer, thickness 1.4-3.2m.
2 layers is 2 layers of recent deposit layer silty clay, clay silts.
3 layers are 3 layers of Quaternary deposit layer clay silt, silty claies.
4 layers is silty clay, clay silt, contracting property of mesohigh, during interlayer is distributed with-and the sandy silt of contracting property of mesolow, clay silt 4
1The clay of layer and contracting property of mesohigh, heavy silty clay 4
2Layer.
5 layers is detail sand, and this layer top portion is furnished with fine silt 5
1Layer is low compressibility, and gross sand is 3.4-3.9m.
Groundwater table first floor static level 5.00-5.80m is a tableland diving, and planning to build the place basic earthquake intensity is 8 °, only considers the near earthquake influence when carrying out seismic design in the Beijing area, and this place foundation soil does not have the possibility of liquefaction.4 layers of main processing layers and 4
1, 4
2Layer natural foundation bearing capacity standard value f
k=150kp
a, obviously can not meet design requirement, therefore must handle.
Through multiple scheme relatively, selected little spacing, paxilla footpath, low-grade CFG long-short pile composite foundation scheme, stake footpath Φ 450mm, pile spacing 900mm, CFG strength grade are C
15, stake is long to enter 5
1Layer 0.5m is as the criterion, and stake is long to be 2.6-3.5m.Bearing capacity of single pile is designed to 181KN, and the Bearing Capacity of Composite Foundation standard is not less than 350kp
aFinal settlement calculates by different standard (rules) respectively, and a kind of algorithm result of calculation 77.9mm satisfies the requirement of design 8cm; Another kind of computational methods also can satisfy the requirement of design 8cm after reduction rationally; Mattress layer thickness 20cm adopts medium coarse sand.
Finish two building CFG long-short pile composite foundations through 30 days clean durations and construct, by test institute of Beijing surveying and designing institute two residential buildings have been carried out 6 groups of Pile Composite Foundation static loading tests and low 370 single piles of deformation dynamic inspection altogether afterwards.Nominal value of bearing capacity of composite foundation is 410kp
a, after degree of depth correction, satisfy design load 450kp
aRequirement.Low deformation dynamic inspection result shows, no matter the pile body degree still the integrality of stake all meet design requirement, workmanship qualification rate 100%, CFG pile driving construction quality comprehensive is assessed as good.
Claims (2)
1, a kind of composite foundation with short piles is characterized in that the long 1.2-5.0m of being of stake; Pile spacing is a doubly stake diameter of 1-3, and the protection stake is long to be 0.2-0.3m, and CFG material strength grade is C
10Or C
15, and do not mix pumping admixture, and the area replacement ratio that lays out pile is 10-30%, the stake end is provided with solid bed.
2, a kind of construction technology of composite foundation with short piles as claimed in claim 1; it is characterized in that the fixed stake of first unwrapping wire position; pore-forming when the CFG material is stirred; and with compacting at the bottom of the hole; then qualified CFG is expected cast, the pile that vibrates, and a control stake top mark height, review again; it is long to chisel out the protection stake then, lays thick medium coarse sand of 10-30cm or graded sand and stone mattress layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98125248 CN1089133C (en) | 1998-12-17 | 1998-12-17 | Composite foundation with short piles and its construction process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98125248 CN1089133C (en) | 1998-12-17 | 1998-12-17 | Composite foundation with short piles and its construction process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1224786A true CN1224786A (en) | 1999-08-04 |
| CN1089133C CN1089133C (en) | 2002-08-14 |
Family
ID=5229113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98125248 Expired - Lifetime CN1089133C (en) | 1998-12-17 | 1998-12-17 | Composite foundation with short piles and its construction process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1089133C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327087C (en) * | 2004-12-28 | 2007-07-18 | 王继忠 | Composite foundation construction method |
| CN100351470C (en) * | 2005-01-11 | 2007-11-28 | 北京市机械施工有限公司 | Method of vibration and extrusion for cast-in-place concrete in pile hole and its vibration rod device |
| CN101269516B (en) * | 2007-03-23 | 2012-03-21 | 上海亿航工贸发展有限公司 | Vibrating method for producing concrete building block by using pipe pile wastewater slurry |
| CN103215964A (en) * | 2013-05-07 | 2013-07-24 | 张俊峰 | Method of industrial systematic treatment of foundation through prestressed concrete solid pre-formed piles |
-
1998
- 1998-12-17 CN CN 98125248 patent/CN1089133C/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327087C (en) * | 2004-12-28 | 2007-07-18 | 王继忠 | Composite foundation construction method |
| CN100351470C (en) * | 2005-01-11 | 2007-11-28 | 北京市机械施工有限公司 | Method of vibration and extrusion for cast-in-place concrete in pile hole and its vibration rod device |
| CN101269516B (en) * | 2007-03-23 | 2012-03-21 | 上海亿航工贸发展有限公司 | Vibrating method for producing concrete building block by using pipe pile wastewater slurry |
| CN103215964A (en) * | 2013-05-07 | 2013-07-24 | 张俊峰 | Method of industrial systematic treatment of foundation through prestressed concrete solid pre-formed piles |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1089133C (en) | 2002-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Applicant after: Beijing urban construction surveying and Mapping Institute Applicant before: He Shiming |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: HE SHIMING TO: BEIJING URBAN CONSTRUCTION PROSPECTING INSTITUTE OF SURVEYING AND MAPPING |
|
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Applicant after: Beijing Urban Construction and Survey Inst. Applicant before: He Shiming |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: HE SHIMING TO: CHENGJIANKANCHACEHUIYUAN, BEIJING CITY |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: BEIJING URBAN CONSTRUCTION RESEARCH INSTITUTE OF Free format text: FORMER OWNER: CHENGJIANKANCHACEHUIYUAN, BEIJING CITY Effective date: 20030103 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20030103 Patentee after: Beijing Urban Construction Exploration & Surveying Design Research Institute Co.,Ltd. Patentee before: Beijing Urban Construction and Survey Inst. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20020814 |
|
| CX01 | Expiry of patent term |