CN102493470A - Foundation treatment method for simulating rigidly enlarged foundation - Google Patents
Foundation treatment method for simulating rigidly enlarged foundation Download PDFInfo
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- CN102493470A CN102493470A CN2011103634880A CN201110363488A CN102493470A CN 102493470 A CN102493470 A CN 102493470A CN 2011103634880 A CN2011103634880 A CN 2011103634880A CN 201110363488 A CN201110363488 A CN 201110363488A CN 102493470 A CN102493470 A CN 102493470A
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Abstract
The invention belongs to the technical field of support construction foundation treatment of various concrete continuous rigid frames or continuous girder bridges, in particular to a foundation treatment method for simulating a rapidly-enlarged foundation, overcoming the defects of high investment, environment pollution, incapability of meeting bearing force in a soft foundation area, and the like. The foundation treatment method comprises the following steps of: in the soft foundation area, carrying out high-pressure rotary jet grouting pile construction and maintenance, excavating and finding each high-pressure rotary jet grouting pile, carrying out pile head chiseling-away treatment to enable all the high-pressure rotary jet grouting piles to have consistent elevation, paving a broken stone hardcore bed, arranging a bar-shaped foundation, carrying out static-load test, and constructing a support structure part. The invention provides a safe and reliability manner for support foundation treatment construction of continuous steel frames and continuous girder bridges in the soft foundation area; the construction cost is saved; and the peripheral construction environment is protected.
Description
Technical field
The invention belongs to firm structure of various concrete continuous or continuous girder bridge rack construction ground Treatment Technology field, be specifically related to a kind of method for processing foundation that rigidity enlarges the basis of simulating.
Background technology
Along with the fast development of speedway and railway cause, firm structure of concrete continuous and continuous girder bridge are handsome in appearance with it, and span is big, practice thrift advantages such as ground resource, in bridge, account for sizable ratio.Continuous rigid frame or continuous girder bridge all need carry out setting up of falsework in construction, particularly in the soft base district, continuous rigid frame that span is big or continuous girder bridge need carry out the construction that the support ground is handled, to guarantee the concreting of major project.And in construction major project process, the intensity of falsework system and stability are the keys that whole construction course and quality of main body project guarantee, and then it then is the key of whole construction that the falsework ground is handled.Intensity and sedimentation that only guaranteed ground is handled meet the demands, and its strutting system could well guarantee the construction of major project.At present, using comparatively widely, foundation treatment mode comprises the processing of drill-pouring pile foundation and changes and fill out the compacting processing.Wherein, the drill-pouring pile foundation is handled the cost height and is produced a large amount of mud, has increased construction cost, has destroyed environment, has caused the waste of resource; Change to fill out to tamp to handle and to satisfy requirement for bearing capacity, and in the continuous girder bridge construction of striding the road cross a river, can't use the range of application limitation in the soft base district.
Summary of the invention
The shortcoming that the invention solves that the investment that prior art exists is big, environment pollution, soft base area carrier power can't be satisfied etc.
The present invention realizes through following technical scheme:
A kind of rigidity of simulating enlarges basic method for processing foundation, may further comprise the steps:
The first step: in the soft base district, carry out the high-pressure rotary-spray pile driving construction, its boundary of works area is the size that rigidity enlarges the basis,
Second step: after construction finishes, carry out the maintenance of high-pressure rotary jet grouting pile,
The 3rd step: after treating that high-pressure rotary jet grouting pile reaches curing period, select one to carry out single-pile static loading test and core boring sampling test at random,
The 4th goes on foot: rigidity is enlarged in the key dimension scope excavate, find each root high-pressure rotary jet grouting pile, carry out pile crown and cut processing, make that the stake top mark of all high-pressure rotary jet grouting piles is high consistent;
The 5th step: in the pile crown scope of chipping, lay the thick hardcore bed of 0.3-0.5m, ballast grain sizes is placed two-layer GSZ smaller or equal to 20cm in the hardcore bed, then hardcore bed is shakeout;
The 6th step: on hardcore bed top; Be provided with and highly be the double-deck strip foundation of 0.4m+0.6m; First floor strip foundation size enlarges key dimension control by rigidity, and the second layer dwindles 0.5m to 1m, arranges respectively up and down in the strip foundation that an interlamellar spacing is the reinforced mesh of 0.2-0.3m; After having constructed, strip foundation carries out maintenance
The 7th step: after treating that strip foundation reaches intensity, utilize sandbag or prefabricated section that strip foundation is carried out static loading test.
The 8th step: the supporting structure part of the last falsework of on the strip foundation that is become, constructing comprises the construction of steel pipe post, the horizontal longeron of shaped steel, the lumps of wood and major project template.
The present invention has practiced thrift construction cost for the support Foundation Treatment of soft base district continuous rigid frame and continuous girder bridge provides a kind of safe and reliable mode, has protected the construction surrounding enviroment.
The specific embodiment
The simulation rigidity enlarges the method for processing foundation on basis, may further comprise the steps:
The first step: in the soft base district; Continuous rigid frame in the actual engineering and continuous girder bridge adopt the construction of falsework method; Confirm the falsework position of the fulcrum by continuous rigid frame and the actual span size of continuous girder bridge; Confirm the scope of interim fulcrum based process according to the upper load at fulcrum place and by the angle of flare principle, in confirming scope, carry out the high-pressure rotary-spray pile driving construction, the scope size of its high-pressure rotary-spray pile driving construction is the size that rigidity enlarges the basis.Wherein, the spacing of high-pressure rotary jet grouting pile can adopt lapping construction according to the bearing capacity of actual engineering, also can construct by certain spacing (its spacing should be advisable greater than 2d);
Second step: the construction high-pressure rotary jet grouting pile can adopt various ways such as single shaft, twin shaft; Can be according to on-site actual situations; In cement paste, add certain Admixture (like early strength admixture etc.) as required; The high-pressure rotary-spray pile driving construction must satisfy the high-pressure rotary jet grouting pile construction inspection rules, to satisfy the intensity of last moulding rigid foundation.After construction finishes, carry out the maintenance of high-pressure rotary jet grouting pile, confirm (general about 28 day) according to the indoor unconfined compression strength test of reality curing period;
The 3rd step: after treating that high-pressure rotary jet grouting pile reaches curing period, select to be not less than 2 at random and carry out single-pile static loading test and core boring sampling test (this step also can carry out in addition, wherein can also do a single pile destructive testing) under similar geological condition.
The 4th goes on foot: rigidity is enlarged in the key dimension scope excavate, and find each root high-pressure rotary jet grouting pile, carry out pile crown and cut processing, cut the pile crown size and control by 0.1m-0.5m, its standard is to guarantee that the stake top mark of all high-pressure rotary jet grouting piles is high consistent;
The 5th step: in the pile crown scope of chipping, lay the thick hardcore bed of 0.3m-0.5m, ballast grain sizes should not need in the hardcore bed to place two-layer GSZ greater than 20cm, then hardcore bed is shakeout;
The 6th step: on hardcore bed top, being provided with highly is the double-deck strip foundation of 0.6m+0.4m, and its first floor strip foundation size enlarges key dimension control by rigidity, and the second layer can suitably dwindle 0.5m-1m.Need arrange respectively up and down in the strip foundation that an interlamellar spacing is HRB335 Φ 16 reinforced mesh of 0.2m-0.3m, carry out maintenance after strip foundation has been constructed.
The 7th step: after treating that strip foundation reaches intensity, utilize sandbag or prefabricated section that strip foundation is carried out static loading test (this step is intended to test the settling amount that ground is handled, and to be used for the reservation of top temporary steel pipe holder height, if any empirical data, can not do).
The 8th step: the supporting structure part of the last falsework of on the strip foundation that is become, constructing comprises the construction of steel pipe post, the horizontal longeron of shaped steel, the lumps of wood and major project template.
The present invention just is that with the main distinction of other method for processing foundation the machinery, technology and the stress system that adopt are different.Promptly utilize high-pressure rotary jet grouting pile will be more among a small circle in soft soil body displacement; Form a bigger rigidity of buried depth and enlarge the basis; Top is provided with hardcore bed and concrete bar shaped basis then, ground is handled satisfied bearing capacity and stability requirement, thereby reach the purpose of safe construction.
The present invention adopts high-pressure rotary jet grouting pile to simulate buried rigidity to enlarge the basis and carry out ground and handle, take up an area of less in the construction, vibration is little, noise is lower, cost is lower, protected environment.In strutting system and ground Treatment Analysis; With the ground treatment of simulated is that buried rigidity enlarges the basis and carries out mechanical calculation, the intensity of its strip foundation itself, rigidity enlarge the intensity on basis, weak substratum intensity, wholely enlarge basic sedimentation etc. and all meet the demands.The present invention arranges more stake (not considering the Friction Pile pitch problems) in limited scope, make that ground forms diaphragm wall in the limited scope, reach higher-strength after, enlarge the basis by buried rigidity and carry out modeling.Facts have proved:
1) more high-pressure rotary jet grouting pile can reach a very high intensity in limited range;
2) diaphragm wall that forms with high-pressure rotary jet grouting pile and foundation soil this moment can be used as the expansion basis and carries out stressed;
3) enlarge the following soil body in basis this moment and satisfy all establishments of requirement of strength (being that substratum intensity satisfies).
Adopt high-pressure rotary jet grouting pile simulation rigidity to enlarge basic characteristics of carrying out the ground processing and be mainly reflected in following aspect:
1, simple in structure, construction technology is ripe, and quality is secure.
2, machinery is versatile and flexible, not limited by the place.
3, high-pressure rotary-spray pile driving construction vibration is little, and noise is low, the ground construction that is fit to that the crowd is dense.
4, the contrast bored pile can not produce a large amount of mud, has played the effect of protection environment; Cost is lower, has practiced thrift construction cost.
5, be widely used, both be fit to the construction of railway continuous rigid frame and continuous girder bridge, be fit to the construction of highway continuous rigid frame and continuous girder bridge again, remarkable in economical benefits.
6, contrast is changed and is filled out the compacting method, is applicable to the construction of various soft base district, and particularly in the soft base district, when major project was striden freeway bridge, its advantage was very obvious.
Claims (1)
1. simulate the method for processing foundation that rigidity enlarges the basis for one kind, may further comprise the steps:
The first step: in the soft base district, carry out the high-pressure rotary-spray pile driving construction, its boundary of works area is the size that rigidity enlarges the basis,
Second step: after construction finishes, carry out the maintenance of high-pressure rotary jet grouting pile;
The 3rd step: after treating that high-pressure rotary jet grouting pile reaches curing period, select one to carry out single-pile static loading test and core boring sampling test at random;
The 4th goes on foot: rigidity is enlarged in the key dimension scope excavate, find each root high-pressure rotary jet grouting pile, carry out pile crown and cut processing, make that the stake top mark of all high-pressure rotary jet grouting piles is high consistent;
The 5th step: in the pile crown scope of chipping, lay the thick hardcore bed of 0.3-0.5m, ballast grain sizes is placed two-layer GSZ smaller or equal to 20cm in the hardcore bed, then hardcore bed is shakeout;
The 6th step: on hardcore bed top; Be provided with and highly be the double-deck strip foundation of 0.4m+0.6m; First floor strip foundation size enlarges key dimension control by rigidity; The second layer dwindles 0.5m to 1m, arranges respectively up and down in the strip foundation that an interlamellar spacing is the reinforced mesh of 0.2-0.3m, carries out maintenance after strip foundation has been constructed;
The 7th step: after treating that strip foundation reaches intensity, utilize sandbag or prefabricated section that strip foundation is carried out static loading test;
The 8th step: the supporting structure part of the last falsework of on the strip foundation that is become, constructing comprises the construction of steel pipe post, the horizontal longeron of shaped steel, the lumps of wood and major project template.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103634880A CN102493470A (en) | 2011-11-16 | 2011-11-16 | Foundation treatment method for simulating rigidly enlarged foundation |
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| CN2011103634880A CN102493470A (en) | 2011-11-16 | 2011-11-16 | Foundation treatment method for simulating rigidly enlarged foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153404A (en) * | 2014-08-28 | 2014-11-19 | 东南大学 | Testing device and testing method of pile composite foundation combined with broken stone hardcore foundation |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59134228A (en) * | 1983-01-20 | 1984-08-01 | Ohbayashigumi Ltd | Integration work of pile or continuous wall and footing |
| CN1687535A (en) * | 2005-04-18 | 2005-10-26 | 河海大学 | Method for constructing composite foundation of piles and ground interactive slurry bonded dispersed body material |
| CN1876970A (en) * | 2005-06-10 | 2006-12-13 | 李仁平 | Long and short piles square units combination type combined pile foundation |
| CN101225660A (en) * | 2008-01-29 | 2008-07-23 | 上海市政工程设计研究总院 | Pile-forming method for high-pressure rotary jet grouting pile in peaty soft soil layer |
| CN101392536A (en) * | 2008-10-15 | 2009-03-25 | 朱奎 | Composite foundation of composite pile with different stiffness |
| CN201648977U (en) * | 2010-04-28 | 2010-11-24 | 中铁三局集团有限公司 | Slant legged rigid frame bracket system of cast-in-place prestressed concrete continuous beam at bridge site |
| CN101892665A (en) * | 2010-07-27 | 2010-11-24 | 中冶沈勘工程技术有限公司 | Construction method for grouting and vibro-replacement stone pile composite foundation |
-
2011
- 2011-11-16 CN CN2011103634880A patent/CN102493470A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59134228A (en) * | 1983-01-20 | 1984-08-01 | Ohbayashigumi Ltd | Integration work of pile or continuous wall and footing |
| CN1687535A (en) * | 2005-04-18 | 2005-10-26 | 河海大学 | Method for constructing composite foundation of piles and ground interactive slurry bonded dispersed body material |
| CN1876970A (en) * | 2005-06-10 | 2006-12-13 | 李仁平 | Long and short piles square units combination type combined pile foundation |
| CN101225660A (en) * | 2008-01-29 | 2008-07-23 | 上海市政工程设计研究总院 | Pile-forming method for high-pressure rotary jet grouting pile in peaty soft soil layer |
| CN101392536A (en) * | 2008-10-15 | 2009-03-25 | 朱奎 | Composite foundation of composite pile with different stiffness |
| CN201648977U (en) * | 2010-04-28 | 2010-11-24 | 中铁三局集团有限公司 | Slant legged rigid frame bracket system of cast-in-place prestressed concrete continuous beam at bridge site |
| CN101892665A (en) * | 2010-07-27 | 2010-11-24 | 中冶沈勘工程技术有限公司 | Construction method for grouting and vibro-replacement stone pile composite foundation |
Non-Patent Citations (2)
| Title |
|---|
| 中华人民共和国建设部: "《建筑地基基础设计规范》", 1 April 2002, 中国建筑工业出版社 * |
| 杨澄宇等: "《建筑施工技术与机械》", 31 July 2007, 高等教育出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153404A (en) * | 2014-08-28 | 2014-11-19 | 东南大学 | Testing device and testing method of pile composite foundation combined with broken stone hardcore foundation |
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Application publication date: 20120613 |