CN1327087C - Composite foundation construction method - Google Patents
Composite foundation construction method Download PDFInfo
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- CN1327087C CN1327087C CNB2004101027101A CN200410102710A CN1327087C CN 1327087 C CN1327087 C CN 1327087C CN B2004101027101 A CNB2004101027101 A CN B2004101027101A CN 200410102710 A CN200410102710 A CN 200410102710A CN 1327087 C CN1327087 C CN 1327087C
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- Prior art keywords
- stake
- pile
- composite foundation
- job practices
- pile body
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- 239000002131 composite material Substances 0.000 title claims abstract description 17
- 238000010276 construction Methods 0.000 title abstract description 6
- 238000005553 drilling Methods 0.000 claims abstract description 6
- 239000002689 soil Substances 0.000 claims description 19
- 150000001875 compounds Chemical class 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000010881 fly ash Substances 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract 1
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Landscapes
- Piles And Underground Anchors (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The present invention aims to provide a construction method for reinforcing foundations. A composite foundation can be formed quickly and conveniently by the method. The replacement rate of an ordinary CFG pile is largely enhanced by adding the diameter expansion part of the pile top. Consequently, the quantity of piles is reduced; the project expense is largely saved for saving materials and simplifying the construction. The construction method comprises the following steps: a drilling machine is arranged in the proper position; a hole is spirally drilled in the position of the pile to predetermined depth in the foundation; hydraulic mixed stuffing is pumped, and a drilling rod is lifted to the ground simultaneously to form a pile body; the diameter expansion part of the pile top which is positioned on the top of the pile and is used for adding the contact area of mattress layers to be laid is formed; the mattress layers are laid on the top surface of the formed diameter expansion part of the pile top and the surface of the foundation.
Description
Technical field
The present invention relates to field of civil engineering, particularly relate to the consolidation process of structure foundation.
Background technology
In the ground stabilization of building is handled, adopt two kinds of methods usually: pile foundation and composite foundation.The composite foundation stabilization processing is meant that the soil nature of certain depth under the ground is better and soil layer is more stable, but intensity and distortion can not be satisfied the requirement of upper load, people take the method for reinforcement for the supporting capacity of bringing into play soil, as job practicess such as broken stone pile, CFG stake, cement earth piles.What wherein use at present was more is spiral mud jacking CFG, i.e. CFG stake.
The mechanical characteristic of CFG stake is that stake is born upper load jointly with soil, and its foundation bearing capacity design formulas is:
f
a＝mR
k/A
p+(1-m)f
sk
In the formula: m-area replacement ratio
R
k-bearing capacity of single pile standard value (kN)
A
p-stake end area (m
2)
f
Sk-substrate soil base standard value of bearing capacity (kPa)
The key parameter of decision bearing capacity size is the m value in this formula, i.e. the area replacement ratio.The size of replacement ratio depends on the diameter of CFG stake and the spacing that lays out pile, if therefore do not improve the native replacement ratio of stake, and the high again bearing capacity that also can't improve the ground processing of the bearing capacity of stake.Because the related standards in the footpath of CFG stake stake at present is the isometrical of 350mm～600mm, and pile spacing is less, if improve replacement ratio and then improve the bearing capacity that ground is handled, reduce foundation deformation, can only adopt quantity that increases stake or the integral diameter that adds timber pile.Undoubtedly, these two kinds of methods all can make engineering quantity strengthen, and engineering cost increases.
Summary of the invention
The object of the present invention is to provide a kind of job practices of consolidated subsoil, can form composite foundation quickly and easily by this method, in this composite foundation, by increasing the long and simple stake of stake top hole enlargement, improve simultaneously replacement ratio greatly at the bearing capacity that improves stake, than the quantity of common CFG stake minimizing stake, thus the spending of saving engineering by a relatively large margin.
To achieve these goals, the job practices of composite foundation of the present invention comprises the steps:
1. rig is in place, and in the desired depth of stake position place auger boring to the ground, this desired depth is to determine like this, is that layer position is stable at this its soil layer of degree of depth place promptly, and soil nature is the soil body preferably, and pile body length and intensity can provide enough bearing capacities simultaneously;
2. the rigid mixed fillers of pumps water on one side is Yi Bian promote drilling rod to the face of land to form pile body;
3. form be positioned at a top be used to increase stake top wide diameter portion with the contact area of the mattress layer that will lay;
4. on the end face and foundation surface of formed stake top wide diameter portion, lay mattress layer.
Best, in the job practices of above-mentioned concrete pile, above-mentioned steps 1. king-pile height degree and intensity can provide enough bearing capacities to be meant, the end resistance that frictional force that pile body provides and stake end provide, and the intensity of pile body, can satisfy the requirement for bearing capacity of sharing upper load after the top hole enlargement.
Best, in the job practices of above-mentioned concrete pile, the 2. middle pore-forming of above-mentioned steps begins earlier to promote drilling rod again behind the mixture-pumping to desired depth.
Best, in the job practices of above-mentioned concrete pile, the 2. middle hydraulicity compound of above-mentioned steps is made of rubble, cement, sand, water, flyash.
Best, in the job practices of above-mentioned concrete pile, after above-mentioned steps is at first drawn out the soil body with auger in 3. and is cleared, form again be positioned at a top be used to increase stake top wide diameter portion with the contact area of mattress layer.
Best, in the job practices of above-mentioned concrete pile, what above-mentioned steps was positioned at a top in 3. is used to increase stake top wide diameter portion with the contact area of mattress layer by the following manner castable, this mode is: excavate the soil body around the stake top, the stake top wide diameter portion that formation links to each other with pile body, this top wide diameter portion is poured into a mould, made itself and pile body form one.
Best, in the job practices of above-mentioned concrete pile, above-mentioned steps 3. king-pile top wide diameter portion cast be hydraulicity compound with pile body peer.
Best, in the job practices of above-mentioned concrete pile, the 4. middle mattress layer of above-mentioned steps is the flexible layer that is made of graded sand and stone.
The characteristics and the advantage of the composite foundation that forms by above method are:
1. significantly improve the native replacement ratio of stake.Neither need increase the quantity of CFG stake, also need not enlarge the whole stake footpath of pile body, only by simple stake top hole enlargement, promptly make the large diameter pile top on stake top, can significantly improve the replacement ratio of stake soil, compare common CFG stake area replacement ratio and improve 3～4 times, play the effect of getting twice the result with half the effort.
2. improve the bearing capacity of stake.Because common CFG stake is that stake soil is stressed jointly, stake itself need not be shared too much upper load, and therefore the length of stake needn't be oversize, and the bearing capacity of stake is not high.And after having taked stake top hole enlargement, the bearing capacity that stake requires itself must satisfy the upper load requirement after a top area increases, and therefore needs pile body to be prolonged on the basis of former designing pile length again, and its requirement for bearing capacity is higher than common CFG stake.
3. significantly reduce construction costs.Though pile body length prolongs than common CFG stake because the raising of the native replacement ratio of stake, obtain with the identical or bigger bearing capacity of foundation soil of common CFG stake in, the quantity that can significantly reduce significantly reduces construction costs.
4. technology is simple.Stake top wide diameter portion only need excavate back perfusion compound and get final product, and makes simple, quality controllable.
Description of drawings
Fig. 1 is as the process chart of the job practices of the expansion top CFG stake of one embodiment of the present of invention.
The specific embodiment
As the job practices of the concrete pile of one embodiment of the present of invention, it comprises the steps that at first, as shown in Figure 1a, rig is in place, adopts auger 1 boring at place, stake position; Then, shown in Fig. 1 b, auger boring is to conventional bearing course at pile end; Then, shown in Fig. 1 c, continue to creep into to certain depth; Afterwards, shown in Fig. 1 d, on one side in boring the rigid mixed fillers 2 of pumps water, auger 1 is promoted on one side; Then, shown in Fig. 1 e, auger 1 is extracted the face of land, press to irritate to finish; Then, shown in Fig. 1 f, around the stake top, excavate the soil body, form the stake top wide diameter portion 3 that links to each other with pile body, this top wide diameter portion 3 is poured into a mould; At last, shown in Fig. 1 g, lay mattress layer 4 at the stake top.
Claims (8)
1, a kind of job practices of composite foundation comprises the steps:
1. rig is in place, and in the desired depth of stake position place auger boring to the ground, this desired depth is to determine like this, is that layer position is stable at this its soil layer of degree of depth place promptly, and soil nature is the soil body preferably, and pile body length and intensity can provide enough bearing capacities simultaneously;
2. the rigid mixed fillers of pumps water on one side is Yi Bian promote drilling rod to the face of land to form pile body;
3. form be positioned at a top be used to increase stake top wide diameter portion with the contact area of the mattress layer that will lay;
4. on the end face and foundation surface of formed stake top wide diameter portion, lay mattress layer.
2, the job practices of composite foundation according to claim 1, in it is characterized in that above-mentioned steps 1., pile body length and intensity can provide enough bearing capacities to be meant, the end resistance that frictional force that pile body provides and stake end provide, and the intensity of pile body, can satisfy the requirement for bearing capacity of sharing upper load after the top hole enlargement.
3, the job practices of composite foundation according to claim 1 is characterized in that above-mentioned steps 2., and pore-forming begins earlier to promote drilling rod again behind the mixture-pumping to desired depth.
4, the job practices of composite foundation according to claim 1 is characterized in that above-mentioned steps 2., and hydraulicity compound is made of rubble, cement, sand, water, flyash.
5, the job practices of composite foundation according to claim 1 is characterized in that above-mentioned steps is 3., after at first auger being drawn out the soil body and clearing, form again be positioned at a top be used to increase stake top wide diameter portion with the contact area of mattress layer.
6, the job practices of composite foundation according to claim 1, in it is characterized in that above-mentioned steps 3., what be positioned at a top is used to increase stake top wide diameter portion with the contact area of mattress layer by the following manner castable, this mode is: excavate the soil body around the stake top, the stake top wide diameter portion that formation links to each other with pile body, this top wide diameter portion is poured into a mould, made itself and pile body form one.
7, the job practices of composite foundation according to claim 1 is characterized in that above-mentioned steps is 3., the wide diameter portion cast of stake top be hydraulicity compound with pile body peer.
8, the job practices of composite foundation according to claim 1 is characterized in that above-mentioned steps 4., and mattress layer is the flexible layer that is made of graded sand and stone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101027101A CN1327087C (en) | 2004-12-28 | 2004-12-28 | Composite foundation construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101027101A CN1327087C (en) | 2004-12-28 | 2004-12-28 | Composite foundation construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1641112A CN1641112A (en) | 2005-07-20 |
| CN1327087C true CN1327087C (en) | 2007-07-18 |
Family
ID=34869668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004101027101A Active CN1327087C (en) | 2004-12-28 | 2004-12-28 | Composite foundation construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1327087C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818493A (en) * | 2010-03-23 | 2010-09-01 | 南通宏华建筑安装有限公司 | Construction method of compound ground base |
| CN102162245A (en) * | 2011-03-17 | 2011-08-24 | 中铁二局股份有限公司 | Construction method for reinforcing foundation of soft soil area |
| JP6173671B2 (en) * | 2012-10-03 | 2017-08-02 | 常郎 後藤 | Structural foundation |
| CN104314078A (en) * | 2014-11-05 | 2015-01-28 | 王继忠 | Concrete pile construction equipment and construction method thereof |
| CN105386433B (en) * | 2015-12-08 | 2017-06-16 | 南京林业大学 | A kind of microorganism soil-fixing CFG pile composite foundations and construction method |
| CN110241695A (en) * | 2019-06-19 | 2019-09-17 | 贵州正业工程技术投资有限公司 | A kind of gravelly soil superelevation fill foundation reinforcement means |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1224786A (en) * | 1998-12-17 | 1999-08-04 | 何世鸣 | Composite foundation with short piles and its construction process |
| CN2352578Y (en) * | 1997-12-18 | 1999-12-08 | 中国建筑科学研究院地基基础研究所 | Compaction and special shaped pile made of cement, coal ash and lost stone |
| JP2001164569A (en) * | 1999-12-13 | 2001-06-19 | Nippon Kaikou Kk | All-casing cast-in-place pile construction method |
| CN1424468A (en) * | 2003-01-21 | 2003-06-18 | 王继忠 | Constructive method for composite foundation |
-
2004
- 2004-12-28 CN CNB2004101027101A patent/CN1327087C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2352578Y (en) * | 1997-12-18 | 1999-12-08 | 中国建筑科学研究院地基基础研究所 | Compaction and special shaped pile made of cement, coal ash and lost stone |
| CN1224786A (en) * | 1998-12-17 | 1999-08-04 | 何世鸣 | Composite foundation with short piles and its construction process |
| JP2001164569A (en) * | 1999-12-13 | 2001-06-19 | Nippon Kaikou Kk | All-casing cast-in-place pile construction method |
| CN1424468A (en) * | 2003-01-21 | 2003-06-18 | 王继忠 | Constructive method for composite foundation |
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| Publication number | Publication date |
|---|---|
| CN1641112A (en) | 2005-07-20 |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Beijing Pocentre Geotechnical Engineering Co.,Ltd. Assignor: Wang Jizhong Contract record no.: 2011110000108 Denomination of invention: Construction method of compound ground base Granted publication date: 20070718 License type: Exclusive License Open date: 20050720 Record date: 20110718 |
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| ASS | Succession or assignment of patent right |
Owner name: BEIJING PUISSANT GEOTECHNICAL ENGINEERING CO., LTD Free format text: FORMER OWNER: WANG JIZHONG Effective date: 20150104 |
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Effective date of registration: 20150104 Address after: 102218, Beijing, Changping District East small town Taiping homes, building 31 Patentee after: Beijing Pocentre Geotechnical Engineering Co.,Ltd. Address before: 102218, Beijing, Changping District East small town Taiping homes, building 31 Patentee before: Wang Jizhong |