CN107489141A - The method that bidirectional screw bores compacting method processing collapsible loess foundation - Google Patents
The method that bidirectional screw bores compacting method processing collapsible loess foundation Download PDFInfo
- Publication number
- CN107489141A CN107489141A CN201710692387.5A CN201710692387A CN107489141A CN 107489141 A CN107489141 A CN 107489141A CN 201710692387 A CN201710692387 A CN 201710692387A CN 107489141 A CN107489141 A CN 107489141A
- Authority
- CN
- China
- Prior art keywords
- foundation
- bidirectional screw
- collapsible loess
- compacting
- bores
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0037—Clays
Landscapes
- 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 method that bidirectional screw bores compacting method processing collapsible loess foundation, belong to field of foundation treatment, to solve the problems, such as to handle depth as shallow existing for existing method.Comprise the following steps：（1）Positioned according to piling foundation plan unwrapping wire, control the position of stake；（2）Using bidirectional screw drill hole of drilling machine；（3）Plain soil or dirt are inserted in hole, and is rammed, until foundation surface；（4）Repeat the above steps（2）And step（3）, complete place processing.The inventive method handles depth up to 30 meters, and suitable for the basement process of big thickness collapsible loess, the not casting in pore forming process, the effect of ground compaction is good, can effectively reduce Loess Collapsibility grade or even eliminate collapsibility of loess.
Description
Technical field
The invention belongs to field of foundation treatment, more particularly to a kind of processing method of collapsible loess foundation.
Background technology
Collapsible loess foundation soil structure is loose, space development, and decline and saturated yielding are serious rapidly for intensity after meeting water.
The method of existing compaction processing soft foundation, the depth maximum of its Ground Treatment is only 10+0.3 rice, right
In the larger collapsible loess foundation of thickness and do not apply to.
The processing method of existing collapsible loess foundation, be related to strong rammer, water filling and hole making by vibration or hammering pore-forming, construct compared with
For complexity, difficulty of construction is big, and pore-forming mode exist vibration or hammering, surrounding environment is polluted, applicability and be applicable
Scope is all affected.
The content of the invention
It is an object of the invention to provide a kind of method that bidirectional screw bores compacting method processing collapsible loess foundation, to solve
Existing for existing method the problem of processing depth as shallow.
Technical solution of the present invention is as follows：A kind of method that bidirectional screw bores compacting method processing collapsible loess foundation, including
Following steps：
（1）Positioned according to piling foundation plan unwrapping wire, control the position of stake；
（2）Using bidirectional screw drill hole of drilling machine；
（3）Plain soil or dirt are inserted in hole, and is rammed, until foundation surface；
（4）Repeat the above steps（2）And step（3）, complete place processing.
Further, a diameter of 400-600mm in the hole.
Further, pitch of holes control is in 2d-3.5d.
Further, the step（3）The particle diameter of middle element soil or dirt is not more than 15mm, and compacting factor is not less than 0.95.
Further, adjacent two rounds interlaced arrangement.
The principle of the invention is：Surrounding soil is carried out during being drilled in drilling using bidirectional screw compacted so that the soil body
Produce that physical compression is compacted, and mechanical index C, φ value is improved, the shearing strength of the soil body is with geo-mechanics parameters and effective
The increase of horizontal stress and increase.
The present invention uses bidirectional helical closed extruding-enlarging aiguille, by high-torque drilling, applies moment of torsion to drill bit and axially presses
Power, the soil body in stake holes is all expressed in pile peripheral earth.It is big that bidirectional screw is drilled to hole depth, up to 30 meters, suitable for big
The basement process of thickness collapsible loess, the not casting in pore forming process, the effect of ground compaction is good, and it is wet can effectively to reduce loess
Fall into grade and even eliminate collapsibility of loess；Compacted backfilling material will not be caused using element soil or dirt to the foundation soil after processing
Pollution, has good environmental benefit；Ground after processing can take different bases according to the height of top proposed building
Form, the relatively low building of 3-5 layers can do the shallow foundations such as isolated footing, strip footing, 6-30 layers on the ground after compaction
Higher buildings thing can then do raft foundation, box foundation or pile foundation on the ground after compaction, have good economy
Benefit.
Field test is carried out using the inventive method, IV grade of self-weight collapse loess place, loess formation thickness 45.0m is wet
Depth 20.0m is fallen into, bearing eigenvalue of foundation soil is 100kPa under native state, and stake end limiting value is 3600kPa, using 2d
Spacing of wells processing groundwork soil bearing capacity characteristic value reaches 160kPa, and stake end limiting value is 3600kPa；Using the 2.5d spacings of wells
Processing groundwork soil bearing capacity characteristic value reaches 130kPa, and stake end limiting value is 3300kPa.Experiment shows that the inventive method is handled
Collapsible loess depth is big, and can effectively improve foundation bearing capacity, eliminates collapsibility of loess.
Brief description of the drawings
Fig. 1 is native stake floor plan；
Fig. 2 is A-A views in Fig. 1.
Embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
As illustrated, in hole（1）Inside insert plain soil or dirt（2）, adjacent holes（1）Between be it is compacted after loess foundation
（3）.
The step of construction method, is as follows：
（1）Positioned according to piling foundation plan unwrapping wire, control the position of stake；
（2）Bidirectional screw rig drills in place, reaches reversion lifting drill bit after projected depth, until completing drilling；Bore dia d=
400-600mm, pitch of holes D=control is in 2d-3.5d.
The depth L of drilling determines according to loess formation thickness and buried depth, most deep to handle L=30 meter.
（3）Plain soil or dirt are inserted in hole（2）, lift elongated hammer and do freely falling body and plain soil or dirt are tamped, directly
To foundation surface；Plain soil or dirt forbid that, using block soil, loose material must not be contained, earth material should sieve, and maximum particle diameter is not
15mm must be more than, compacting factor is not less than 0.95.
（4）Repeat step（2）、（3）, handled by the way of interval drills, ensure compacted effect.Built according to top is proposed
The height of thing is built, takes different base forms, the relatively low building of 3-5 layers can do independent base on the ground after compaction
The shallow foundations such as plinth, strip footing, 6-30 layer higher buildings thing can then do raft foundation, box-shaped base on the ground after compaction
Plinth or pile foundation.Complete place processing.
Claims (5)
1. a kind of method that bidirectional screw bores compacting method processing collapsible loess foundation, it is characterised in that comprise the following steps：
（1）Positioned according to piling foundation plan unwrapping wire, control the position of stake；
（2）Using bidirectional screw rig drilling bore hole（1）；
（3）In hole（1）Plain soil or dirt are inside inserted, and is rammed, until foundation surface；
（4）Repeat the above steps（2）And step（3）, complete place processing.
2. the method that bidirectional screw according to claim 1 bores compacting method processing collapsible loess foundation, it is characterised in that：
A diameter of 400-600mm in the hole.
3. the method that bidirectional screw according to claim 1 or 2 bores compacting method processing collapsible loess foundation, its feature exist
In：Pitch of holes is controlled in 2d-3.5d.
4. the method that bidirectional screw according to claim 3 bores compacting method processing collapsible loess foundation, it is characterised in that：
The step（3）The particle diameter of middle element soil or dirt is not more than 15mm, and compacting factor is not less than 0.95.
5. the method that bidirectional screw according to claim 4 bores compacting method processing collapsible loess foundation, it is characterised in that：
Adjacent two rounds interlaced arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710692387.5A CN107489141A (en) | 2017-08-14 | 2017-08-14 | The method that bidirectional screw bores compacting method processing collapsible loess foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710692387.5A CN107489141A (en) | 2017-08-14 | 2017-08-14 | The method that bidirectional screw bores compacting method processing collapsible loess foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107489141A true CN107489141A (en) | 2017-12-19 |
Family
ID=60645416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710692387.5A Pending CN107489141A (en) | 2017-08-14 | 2017-08-14 | The method that bidirectional screw bores compacting method processing collapsible loess foundation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107489141A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820793A (en) * | 2019-11-15 | 2020-02-21 | 山东建筑大学 | Composite foundation for collapsible loess area and construction method |
| CN111335912A (en) * | 2019-12-17 | 2020-06-26 | 中建水务环保有限公司 | Large-pipe-diameter mechanical pipe jacking construction process for soft soil foundation in collapsible loess area |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080373A (en) * | 2010-12-09 | 2011-06-01 | 西安建筑科技大学 | Construction method for jointly treating collapsibility of loess foundation by using DDC (Downhole Dynamic Compaction) pile and pile foundation |
| CN102162246A (en) * | 2011-05-18 | 2011-08-24 | 中铁西北科学研究院有限公司 | Vibration-less compaction method of collapsible loess foundation |
| JP2012237186A (en) * | 2011-04-26 | 2012-12-06 | Fujitec Co Ltd | Liquefaction prevention method |
| CN106677154A (en) * | 2017-01-20 | 2017-05-17 | 山西省交通科学研究院 | Collapsible loess foundation rubble frame structure reinforcement system and reinforcement method |
-
2017
- 2017-08-14 CN CN201710692387.5A patent/CN107489141A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080373A (en) * | 2010-12-09 | 2011-06-01 | 西安建筑科技大学 | Construction method for jointly treating collapsibility of loess foundation by using DDC (Downhole Dynamic Compaction) pile and pile foundation |
| JP2012237186A (en) * | 2011-04-26 | 2012-12-06 | Fujitec Co Ltd | Liquefaction prevention method |
| CN102162246A (en) * | 2011-05-18 | 2011-08-24 | 中铁西北科学研究院有限公司 | Vibration-less compaction method of collapsible loess foundation |
| CN106677154A (en) * | 2017-01-20 | 2017-05-17 | 山西省交通科学研究院 | Collapsible loess foundation rubble frame structure reinforcement system and reinforcement method |
Non-Patent Citations (1)
| Title |
|---|
| 赵海飞: "《钻孔灰土挤密桩在砂质湿陷性黄土中的应用》", 《电力勘探设计》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820793A (en) * | 2019-11-15 | 2020-02-21 | 山东建筑大学 | Composite foundation for collapsible loess area and construction method |
| CN111335912A (en) * | 2019-12-17 | 2020-06-26 | 中建水务环保有限公司 | Large-pipe-diameter mechanical pipe jacking construction process for soft soil foundation in collapsible loess area |
| CN111335912B (en) * | 2019-12-17 | 2022-03-11 | 中建水务环保有限公司 | Large-pipe-diameter mechanical pipe jacking construction process for soft soil foundation in collapsible loess area |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101718091B (en) | Method for treating foundation consisting of liquid soil layer and soft soil mutual layer | |
| US8128319B2 (en) | Shielded tamper and method of use for making aggregate columns | |
| CN104074186B (en) | The casing device of pore-forming and construction method thereof in a kind of building lot | |
| US9915050B2 (en) | Apparatus and method for ground improvement | |
| CN106703004A (en) | Treatment method for collapsible loess foundation | |
| CN207891857U (en) | Bidirectional screw soil compaction stake handles collapsible loess composite foundation | |
| US11255066B2 (en) | Method for producing a component free of toe pressure | |
| CN101660307A (en) | Treatment method of collapsible loess foundation | |
| CN104314078A (en) | Concrete pile construction equipment and construction method thereof | |
| CN102888834A (en) | Construction method of large-diameter crushed stone pile | |
| CN104164873B (en) | Prestressed pipe pile and construction method thereof | |
| CN107489141A (en) | The method that bidirectional screw bores compacting method processing collapsible loess foundation | |
| CN111851479B (en) | Method for constructing immersed tube rammed cast-in-place pile in sand layer or gravel layer | |
| CN101196004A (en) | Diving casting cast-in-place pile construction method for constructing in scree layer and sand layer | |
| CN207878446U (en) | A kind of telescopic deep-hole replacement rammer for column base | |
| CN104594339B (en) | The construction method of concrete-pile | |
| EP2446089B1 (en) | Apparatus and method for ground improvement | |
| RU2328576C1 (en) | Method of slab-pile foundation erection | |
| RU2634912C1 (en) | Method of arranging driven pile in punched well in weak water-saturated soils (versions) | |
| RU2601630C2 (en) | Method of pile drive device | |
| CA2950733C (en) | Apparatus and method for ground improvement | |
| CN104153355B (en) | The constructing device of concrete-pile and construction method thereof | |
| CN204252120U (en) | The construction equipment of concrete pile | |
| CN204225100U (en) | The construction equipment of concrete pile | |
| CN101280562A (en) | Construction method of guarantying pile length of driven cast-in-place pile constructed in pebble layer or sand layer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171219 |
|
| RJ01 | Rejection of invention patent application after publication |