CN104153383B - A kind of marine soft soil foundation structure and treatment process thereof - Google Patents
A kind of marine soft soil foundation structure and treatment process thereof Download PDFInfo
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- CN104153383B CN104153383B CN201410386635.XA CN201410386635A CN104153383B CN 104153383 B CN104153383 B CN 104153383B CN 201410386635 A CN201410386635 A CN 201410386635A CN 104153383 B CN104153383 B CN 104153383B
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- mixing pile
- soft soil
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- 239000002689 soil Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000004568 cement Substances 0.000 claims abstract description 56
- 238000010276 construction Methods 0.000 claims abstract description 27
- 230000007704 transition Effects 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 7
- 239000011398 Portland cement Substances 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 208000028804 PERCHING syndrome Diseases 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 1
- 238000011278 co-treatment Methods 0.000 abstract description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005056 compaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009430 construction management Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The present invention discloses a kind of marine soft soil foundation structure and treatment process thereof, described marine soft soil foundation structure comprises CFG stake, cement mixing pile, mattress layer, CFG stake and cement mixing pile are arranged in marine soft soil ground, and lay mattress layer in CFG stake and cement mixing pile top, one layer of two-way geo-grid is laid within the scope of the joining section of the transition and linkage between CFG stake and cement mixing pile, the treatment process of described marine soft soil foundation structure, implementation step comprises levelling of the land, measure of pile position setting-out, the construction of stake body, clear soil, Stake head handling, mattress layer laying. The present invention is directed to engineering according to the different geologic condition in each section, load bearing requirements and execution conditions, adopt CFG stake and the deep marine soft soil ground of cement mixing pile co-treatment, meet the requirement to bearing capacity of foundation soil, reduction construction costs; Meet engineering to the control overflow of non-uniform settling simultaneously.
Description
Technical field
The present invention relates to the Soft Ground technical field of geotechnical engineering, specifically the structure of a kind of coastal thick or long and narrow soft clay ground of super thick and treatment process thereof.
Background technology
China is vast in territory, and topographic and geologic situation is complicated and changeable, and soft clay ground distributed areas are more extensive. Under normal circumstances, building highway in soft soil roadbed area, roadbed exists that resistance to overturning is bad and a series of practical problems such as posterior settlement distortion is bigger, seriously affects the construction quality of road and the normal use in later stage.
The deficiency that existing soft foundation processing technology exists:
(1) same engineering treatment method is more single;
(2) economic benefits comparison is poor;
(3) non-uniform settling control is poor.
For ensureing the bearing capacity after Soft Ground and settlement Control, it is proposed to adopt CFG stake and cement mixing pile and in conjunction with the deep marine soft soil ground of mattress layer co-treatment, thus reach the object improving bearing capacity of foundation soil and control non-uniform settling.
Summary of the invention
It is an object of the invention to provide bearing capacity of foundation soil is strong, cost is low marine soft soil foundation structure and treatment process thereof.
For achieving the above object, the present invention provides following technical scheme:
A kind of marine soft soil foundation structure, comprise CFG stake, cement mixing pile, mattress layer, CFG stake and cement mixing pile are arranged in marine soft soil ground, and lay mattress layer in CFG stake and cement mixing pile top, lay one layer of two-way geo-grid within the scope of the joining section of the transition and linkage between CFG stake and cement mixing pile.
As the scheme that the present invention is further: CFG stake is applicable to the section of soft layer thickness more than 15m; CFG stake pile shaft concrete strength C15, the ordinary Portland cement that cement selection is more than 42.5 grades, CFG stake stake footpath 500mm; More than soft layer 2m should be penetrated at the bottom of CFG stake stake.
As the scheme that the present invention is further: cement mixing pile stake footpath 550mm, cement mixing pile spacing is 1.2m or 1.0m, and equilateral triangle is arranged; Cement consumption is not less than 65kg/m, and cement adopts 42.5 grades of ordinary Portland cements, and water cement ratio is 0.45��0.5, adopts four to stir the construction technology that four sprays are stirred in two sprays or four; Cement-earth 90 days unconfined compression strengths are not less than 1.5MPa, bearing capacity of single pile standard value is 130kN; Cement mixing pile pile position deviation is not more than 50mm, and perpendicularity deviation is not more than 1.5%, and cement mixing pile stake footpath deviation is not more than 2%.
As the scheme that the present invention is further: described mattress layer is two layers of two-way geo-grid folder thick blotter of 30cm.
The treatment process of described marine soft soil foundation structure, concrete implementation step is:
A. levelling of the land, removes ground, the underground obstacle of workyard, is drawn water and desilting in the place having water, and backfill soil also flattens compacting;
B. measure of pile position setting-out, carries out surveying setting-out to stake position, makes each position;
C. stake body construction, carries out construction pile by CFG stake, cement mixing pile; CFG pile driving construction step, for vibration sinking tube technique: place pile top, pile-forming machine perching, vibration sinking tube, one-tenth hole is checked and accepted, pouring mixed material, vibration pipe-drawing, pile are checked, the displacement of stake machine; Cement mixing pile construction procedure: smooth ground, measuring stake position, driller insertion, prepare grout, stir sinking in advance, whitewashing stir promote, repeat to stir, rig displacement, pipe blow-through;
D. clear native in time after pile;
E. Stake head handling, blocks stake head more than CFG stake, cement mixing pile design of pile top absolute altitude; C25 Steel Concrete is established on the stake top of roadbed part, and wherein pile cover is not established on cement mixing pile stake top, and pile cover is not established on the stake top that case contains structure base position;
F. mattress layer is laid on top, levelling of the land face.
As the scheme that the present invention is further: described backfill soil adopts cohesive soil.
As the scheme that the present invention is further: pile cover is of a size of 100cm �� 100cm �� 30cm, it is 6cm that stake jacking enters pile cover length.
Compared with prior art, the invention has the beneficial effects as follows: for engineering according to the different geologic condition in each section, load bearing requirements and execution conditions, adopt CFG stake and the deep marine soft soil ground of cement mixing pile co-treatment, not only meet the requirement to bearing capacity of foundation soil, and reduce construction costs; Different pile foundation coordinates the mattress layer of different thickness and lays the acting in conjunction of one layer of two-way geo-grid within the scope of joining section, meets engineering to the control overflow of non-uniform settling.
Accompanying drawing explanation
Fig. 1 is marine soft soil foundation structure longitudinal section schematic diagram;
Fig. 2 is CFG pile driving construction schematic diagram;
In figure: 1-CFG stake, 2-cement mixing pile, 3-mattress layer, the two-way geo-grid of 4-.
Embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention's part embodiment, instead of whole embodiments. Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
It is an object of the present invention to overcome in prior art the defect existed, it is provided that a kind of deep marine soft soil method for processing foundation, this practical process, it is ensured that process groundwork bearing capacity intensity, stability meet the safety requirements of engineering.
Refer to Fig. 1 and Fig. 2, in the embodiment of the present invention, a kind of marine soft soil foundation structure and treatment process thereof, described marine soft soil foundation structure comprises CFG stake 1, cement mixing pile 2, mattress layer 3, CFG stake 1 and cement mixing pile 2 are arranged in marine soft soil ground, and lay mattress layer 3 in CFG stake 1 and cement mixing pile 2 top, lay one layer of two-way geo-grid 4 within the scope of the joining section of the transition and linkage between CFG stake 1 and cement mixing pile 2.
In the embodiment of the present invention, the treatment process of described marine soft soil foundation structure, concrete implementation step is:
A. levelling of the land
Removing the ground of workyard, underground obstacle and building waste, underground utilities, cable, boulder, tree root, domestic refuse etc., drawn water and desilting in the place having water, backfill cohesive soil is also flattened compacting.
B. measure of pile position setting-out
Carrying out surveying setting-out according to the stake position design plane figure that lays out pile, make each position, error requirements is less than rig location; Draw the position that major control point not easily rolls in working-yard, retain with concrete is fixing; Measure field ground elevation, it is determined that stake top mark height. Stake position is numbered, is beneficial to construction management and data compilation.
C. stake body construction
1) CFG stake 1 is constructed
The conventional vibration sinking tube technique of CFG pile driving construction and long screw auger technique, the present invention for vibration sinking tube technique, construction procedure:
Place pile top, pile-forming machine perching, vibration sinking tube, one-tenth hole is checked and accepted, pouring mixed material, vibration pipe-drawing, pile are checked, the displacement of stake machine.
Construction requirement:
CFG stake 1 is applicable to the section of soft layer thickness more than 15m; CFG stake 1 pile shaft concrete strength C15, the ordinary Portland cement that cement selection is more than 42.5 grades, CFG stake 1 footpath 500mm; More than soft layer 2m should be penetrated at the bottom of CFG stake 1. Lay out pile by square, general section pile spacing 2.0 meters, spacing 1.8 meters under the structures such as case culvert.
2) cement mixing pile 2 is constructed
Construction procedure:
Smooth ground, measuring stake position, driller insertion, prepare grout, stir sinking in advance, whitewashing stir promote, repeat to stir, rig displacement, pipe blow-through.
Construction requirement:
Cement mixing pile 2 footpath 550mm, cement mixing pile 2 spacing is 1.2m or 1.0m, and equilateral triangle is arranged; Cement consumption is not less than 65kg/m, and cement adopts 42.5 grades of ordinary Portland cements, and water cement ratio is 0.45��0.5, adopts four to stir two sprays or four and stirs four spraying construction techniques. The determination of above design variable should be determined by test pile before deep-cement mixing pile 2 is constructed. Cement-earth 90 days unconfined compression strengths are not less than 1.5MPa, bearing capacity of single pile standard value requirement 130kN. Cement mixing pile 2 position permissible variation 50mm, verticality permissible variation 1.5%, cement mixing pile 2 footpath permissible variations 2%. When mattress layer 3 excavates, by the stake section of construction quality difference in mattress layer 3 scope with manually cutting, should must not adopt mechanical equivalent of light excavation.
D. clear soil
1) after pile, when reaching strength grade 50% and pile after 2��3 days should clear soil in time, avoid because of pile strength improve bigger time, cut stake difficulty.
2) clear soil adopts small mechanical equipment and hand excavation, transport, avoids broken pile and the disturbance to foundation soil.
3) the reserved at least 10cm of clear soil manually removes, levelling.
E. Stake head handling
1), after soil layer to be protected is removed, above for design of pile top absolute altitude stake head can be blocked. Artificial section stake, adopts 120 ��, 3 drill rod intervals, radially wedges stake body, until stake body in top disconnects, ensures that stake is smooth, oblique stubble does not occur. If causing a body to break to machine top design below absolute altitude when base groove excavation and rejecting stake head, then must take remedial measures. Surface of fracture is relatively near apart from stake top, can pile extension to design of pile top absolute altitude. Material therefor proportioning is identical with stake body compound, and pile extension width should be greater than a footpath 200mm, and notes broken pile place dabbing, rinses well with water.
2) C25 Steel Concrete pile cover is established on the stake top of roadbed part, size is namely long �� wide �� thick is 100cm �� 100cm �� 30cm pile cover, it is 6cm that stake jacking enters pile cover length, and wherein pile cover is not established on cement mixing pile 2 top, and pile cover is not established on the stake top at the structure base positions such as case culvert.
F. mattress layer 3 is laid
In order to adjust the acting in conjunction of stake and inter-pile soil, lay two layers of two-way geo-grid 4 on top, whole levelling of the land face and press from both sides the thick blotter of 30cm as mattress layer 3. During construction, first void spreads, then adopts Static compaction, also can tamp when inter-pile soil water content is little. Inter-pile soil water content is higher, particularly highly sensitive soil, it should be noted that construction disturbance, on the impact of inter-pile soil, produces spongy soil to avoid. To the transition and linkage between different treatment of soft foundation mode, joining section and length are got and are laid one layer of two-way geo-grid 4 within the scope of 20m, and respective workshop section overlap joint 10m length, plane is arranged in top broken stone cushion layer 3 end face.
The present invention is directed to engineering according to the different geologic condition in each section, load bearing requirements and execution conditions, adopt CFG stake and the deep marine soft soil ground of cement mixing pile co-treatment, not only meet the requirement to bearing capacity of foundation soil, and reduce construction costs; Different pile foundation coordinates the mattress layer of different thickness and lays the acting in conjunction of one layer of two-way geo-grid within the scope of joining section, meets engineering to the control overflow of non-uniform settling.
To those skilled in the art, it is clear that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit or the essential characteristic of the present invention, it is possible to realize the present invention in other specific forms. Therefore, no matter from which point, embodiment all should be regarded as exemplary, and right and wrong are restrictive, the scope of the present invention is limited by claims instead of above-mentioned explanation, it is intended that all changes in the implication of the equivalent important document dropping on claim and scope included in the present invention.
In addition, it is to be understood that, although this specification sheets is described according to enforcement mode, but not each enforcement mode only comprises an independent technical scheme, this kind of narrating mode of specification sheets is only for clarity sake, those skilled in the art should by specification sheets integrally, and the technical scheme in each embodiment through appropriately combined, can also form other enforcement modes that it will be appreciated by those skilled in the art that.
Claims (6)
1. the treatment process of a marine soft soil foundation structure, described marine soft soil foundation structure comprises CFG stake (1), cement mixing pile (2), mattress layer (3), CFG stake (1) and cement mixing pile (2) are arranged in marine soft soil ground, and lay mattress layer (3) in CFG stake (1) and cement mixing pile (2) top, lay one layer of two-way geo-grid (4) within the scope of the joining section of the transition and linkage between CFG stake (1) and cement mixing pile (2);
It is characterized in that, the concrete implementation step for the treatment of processes is:
A. levelling of the land, removes ground, the underground obstacle of workyard, is drawn water and desilting in the place having water, and backfill soil also flattens compacting;
B. measure of pile position setting-out, carries out surveying setting-out to stake position, makes each position;
C. stake body construction, carries out construction pile by CFG stake (1), cement mixing pile (2); CFG stake (1) adopts the construction of vibration sinking tube technique, and its construction procedure is: place pile top, pile-forming machine perching, vibration sinking tube, the examination of one-tenth hole, pouring mixed material, vibration pipe-drawing, pile inspection, the displacement of stake machine; Cement mixing pile (2) construction procedure: smooth ground, measuring stake position, driller insertion, prepare grout, stir sinking in advance, whitewashing stir promote, repeat to stir, rig displacement, pipe blow-through;
D. clear native in time after pile;
E. Stake head handling, blocks stake head more than CFG stake (1), cement mixing pile (2) design of pile top absolute altitude; C25 Steel Concrete is established on the stake top of roadbed part, and wherein pile cover is not established on cement mixing pile (2) stake top, and pile cover is not established on the stake top that case contains structure base position;
F. mattress layer (3) is laid on top, levelling of the land face.
2. the treatment process of marine soft soil foundation structure according to claim 1, it is characterised in that, CFG stake (1) is applicable to the section of soft layer thickness more than 15m; CFG stake (1) pile shaft concrete strength C15, the ordinary Portland cement that cement selection is more than 42.5 grades, CFG stake (1) stake footpath 500mm; More than soft layer 2m should be penetrated at the bottom of CFG stake (1) stake.
3. the treatment process of marine soft soil foundation structure according to claim 1, it is characterised in that, cement mixing pile (2) stake footpath 550mm, cement mixing pile (2) spacing is 1.2m or 1.0m, and equilateral triangle is arranged; Cement consumption is not less than 65kg/m, and cement adopts 42.5 grades of ordinary Portland cements, and water cement ratio is 0.45��0.5, adopts four to stir the construction technology that four sprays are stirred in two sprays or four; Cement-earth 90 days unconfined compression strengths are not less than 1.5MPa, bearing capacity of single pile standard value is 130kN; Cement mixing pile (2) pile position deviation is not more than 50mm, and perpendicularity deviation is not more than 1.5%, and cement mixing pile (2) stake footpath deviation is not more than 2%.
4. the treatment process of marine soft soil foundation structure according to claim 1, it is characterised in that, described mattress layer (3) is two layers of two-way geo-grid (4) folder thick blotter of 30cm.
5. the treatment process of marine soft soil foundation structure according to claim 1, it is characterised in that, described backfill soil adopts cohesive soil.
6. the treatment process of marine soft soil foundation structure according to claim 1, it is characterised in that, pile cover is of a size of 100cm �� 100cm �� 30cm, and it is 6cm that stake jacking enters pile cover length.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410386635.XA CN104153383B (en) | 2014-08-08 | 2014-08-08 | A kind of marine soft soil foundation structure and treatment process thereof |
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| CN201410386635.XA CN104153383B (en) | 2014-08-08 | 2014-08-08 | A kind of marine soft soil foundation structure and treatment process thereof |
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| CN104153383A CN104153383A (en) | 2014-11-19 |
| CN104153383B true CN104153383B (en) | 2016-06-08 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108532394A (en) * | 2017-03-04 | 2018-09-14 | 北京桥昌混凝土搅拌有限公司 | A kind of construction technology of soft base |
| CN106906816B (en) * | 2017-03-17 | 2019-05-03 | 东北大学 | A method of improving soft soil foundation prefabricated pile effect of driving pile |
| CN110747706A (en) * | 2019-09-30 | 2020-02-04 | 中国二冶集团有限公司 | Construction method for replacing weak soil of foundation bearing layer |
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| CN201495468U (en) * | 2009-08-18 | 2010-06-02 | 冯守中 | Structure of highway subgrade on wet soft foundation |
| CN102912808A (en) * | 2012-11-06 | 2013-02-06 | 山东兴华建设集团有限公司 | Spiral CFG pile and cement stirring pile combined composite foundation construction method |
| CN202830952U (en) * | 2012-08-08 | 2013-03-27 | 广州番禺职业技术学院 | Novel soft soil foundation structure |
| JP2013217101A (en) * | 2012-04-09 | 2013-10-24 | Kumikawa Tekkosho:Kk | Quake absorbing pile installation mechanism |
| CN203475457U (en) * | 2013-08-19 | 2014-03-12 | 中信建设有限责任公司 | Composite pile foundation used for soft soil building foundation |
| CN203546743U (en) * | 2013-10-30 | 2014-04-16 | 上海勘测设计研究院 | CFG pile composite foundation mattress layer |
| CN204040048U (en) * | 2014-08-08 | 2014-12-24 | 中建五局土木工程有限公司 | A kind of marine soft soil foundation improvement structure |
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2014
- 2014-08-08 CN CN201410386635.XA patent/CN104153383B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201495468U (en) * | 2009-08-18 | 2010-06-02 | 冯守中 | Structure of highway subgrade on wet soft foundation |
| JP2013217101A (en) * | 2012-04-09 | 2013-10-24 | Kumikawa Tekkosho:Kk | Quake absorbing pile installation mechanism |
| CN202830952U (en) * | 2012-08-08 | 2013-03-27 | 广州番禺职业技术学院 | Novel soft soil foundation structure |
| CN102912808A (en) * | 2012-11-06 | 2013-02-06 | 山东兴华建设集团有限公司 | Spiral CFG pile and cement stirring pile combined composite foundation construction method |
| CN203475457U (en) * | 2013-08-19 | 2014-03-12 | 中信建设有限责任公司 | Composite pile foundation used for soft soil building foundation |
| CN203546743U (en) * | 2013-10-30 | 2014-04-16 | 上海勘测设计研究院 | CFG pile composite foundation mattress layer |
| CN204040048U (en) * | 2014-08-08 | 2014-12-24 | 中建五局土木工程有限公司 | A kind of marine soft soil foundation improvement structure |
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