CN102966109A - Method for constructing zonal deep foundation pit bottom sealing of soft soil foundation - Google Patents
Method for constructing zonal deep foundation pit bottom sealing of soft soil foundation Download PDFInfo
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- CN102966109A CN102966109A CN2012104360986A CN201210436098A CN102966109A CN 102966109 A CN102966109 A CN 102966109A CN 2012104360986 A CN2012104360986 A CN 2012104360986A CN 201210436098 A CN201210436098 A CN 201210436098A CN 102966109 A CN102966109 A CN 102966109A
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Abstract
The invention discloses a method for constructing a zonal deep foundation pit bottom sealing of a soft soil foundation. The method comprises the following steps: 1, construction of a supporting structure of a foundation pit: steel sheet piles or cast-in-situ bored piles are constructed along the two sides of a foundation; 2, adoption of sand gravel piles to reinforce the bottom of the foundation pit: in the supporting structure, the sand gravel piles are piled into the bottom of the foundation pit, and the elevations of the pile blocks of the sand gravel piles are the same with the elevations of the bottom of the foundation pit; 3, structural piles are constructed and adopt prestress high concrete (PHC) tube piles; 4, the excavation of the foundation pit is completed; 5, a bottom concrete cushion of the foundation pit is constructed on the tops of the sand gravel piles; and 6, an underground structural object is constructed on the bottom concrete cushion. Through the method, the bottom of the foundation pit can be compacted, and the bearing capability of foundation soil is increased; the soil solidification is accelerated, a composite foundation of displacement piles and the solidified soft soil is formed, and the shearing strength of the foundation can be obviously increased; and the construction period can be shortened, the construction cost is lowered, the method is easy and convenient and practicable, the engineering quality is easily controlled, and the method has high efficiency and is safe and reliable.
Description
Technical field
The present invention relates to a kind of deep foundation ditch back cover job practices, particularly relate to the banded deep foundation ditch back cover of a kind of soft foundation job practices.
Background technology
General deep foundation ditch steel plate pile or bored pile back cover adopt cement mixing pile to construct, and soil stabilization adopts gridiron structure.The cement mixing pile long construction period also can cause serious environment pollution, and could earth excavation after needing wait to reach intensity in 28 days.Long in time limit, construction cost is high.Particularly for the length of arranging along road one side apart from integrated pipe canal and power tunnel engineering, and foundation depth is darker, for example-5.50～-10.00m, average length 30m arranges deformation joint one, adopt above-mentioned existing cement mixing pile back cover technology, long in time limit, the problem that construction cost is high can be more outstanding, if organic content is high in the mud, consolidation effect will be affected.
Summary of the invention
The present invention provides the banded deep foundation ditch back cover of a kind of soft foundation job practices for solving the technical problem that exists in the known technology, adopts the method, can the reduction of erection time, and reducing construction cost, and be convenient to the Control Engineering quality.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: the banded deep foundation ditch back cover of a kind of soft foundation job practices may further comprise the steps:
One) applies the supporting and protection structure of ground foundation ditch: apply steel sheet pile or bored pile along the ground both sides;
Two) reinforce at the bottom of adopting the hole of sand-gravel pile to the ground foundation ditch: in supporting and protection structure, sand-gravel pile is squeezed at the bottom of the hole of ground foundation ditch, and absolute altitude is identical at the bottom of making the high hole with the ground foundation ditch of the stake top mark of sand-gravel pile;
Three) apply structure pile, structure pile adopts the PHC pile tube;
Four) finish excavation of foundation pit;
Five) apply the hole base concrete bed course of ground foundation ditch at the top of sand-gravel pile;
Six) apply underground structure at concrete cushion.
Described step 2), applying in the zone of sand-gravel pile, sand-gravel pile is evenly arranged, and two adjacent sand-gravel pile spacings are 2～4 times of sand-gravel pile diameters; The sand-gravel pile reinforcement depth is 3m～8m; The compound that the sand-gravel pile filler adopts medium coarse sand and the rubble by prototype gradation to form, the sandstone match ratio is 1:1～3, and the medium coarse sand mud content is not more than 5%, and the particle diameter of rubble is 20～40mm.
Advantage and good effect that the present invention has are: 1) sand-gravel pile is by extruding and vibration, reaches closely knit at the bottom of making the hole of ground foundation ditch, increases bearing capacity of foundation soil; 2) sand-gravel pile can play the effect of displacement mud and draining, accelerates consolidation of soil, forms the composite foundation of displacement stake and fixed rear weak soil, can improve significantly the shear strength of ground; 3) the present invention can shorten construction period, reducing construction cost, and simple and easy to do, be easy to the Control Engineering quality, efficient is high, and is safe and reliable.
Description of drawings
Fig. 1 is for using the profile of the present invention's construction;
Fig. 2 reinforces plan view at the bottom of using hole of the present invention.
Among the figure: 1, steel sheet pile or bored pile, 2, sand-gravel pile, 3, the PHC pile tube, 4, concrete cushion, 5, underground structure.
The specific embodiment
For further understanding summary of the invention of the present invention, Characteristic, hereby exemplify following examples, and cooperate accompanying drawing to be described in detail as follows:
See also Fig. 1～Fig. 2, the banded deep foundation ditch back cover of a kind of soft foundation job practices may further comprise the steps:
One) apply the supporting and protection structure of ground foundation ditch: measurement and positioning and levelling of the land set steel sheet pile or bored pile 1, as supporting and protection structure along the ground both sides.
Two) reinforce at the bottom of adopting the hole of sand-gravel pile to the ground foundation ditch: in supporting and protection structure, sand-gravel pile 2 is squeezed at the bottom of the hole of ground foundation ditch, and absolute altitude is identical at the bottom of making the high hole with the ground foundation ditch of the stake top mark of sand-gravel pile 2, reinforces at the bottom of the hole to the ground foundation ditch.
Sand-gravel pile 2 is preferably and is evenly arranged in applying the zone, and the spacing of two adjacent sand-gravel piles is advisable with 2～4 times of sand-gravel pile diameters; Can adopt the jumping storehouse to arrange or full hall layout according to mud characteristics sand-gravel pile; The sand-gravel pile reinforcement depth is advisable with 3m～8m; The sand-gravel pile filler is preferably selected the compound that is comprised of the medium coarse sand of prototype gradation and rubble, and the sandstone match ratio is 1:1～3, and the medium coarse sand mud content should be not more than 5%, and the particle diameter of rubble is advisable with 20～40mm.
In the present embodiment, apply equipment and the model of sand-gravel pile 2: vibrating type machine for placing pipesor piles, the power of vibrating 90KN.The sand-gravel pile filler is selected the compound that is comprised of the medium coarse sand of prototype gradation and rubble, and the sandstone match ratio is 1:1, and the medium coarse sand mud content is not more than 5%, and the particle diameter of rubble is 20～40mm.The diameter 400mm of sand-gravel pile 2, effective length 8m, empty stake 5.5m, sand-gravel pile 2 full hall in foundation ditch is evenly arranged, and adjacent two spacing is 0.7m * 0.7m, and sand-gravel pile 2 top mark height are the end absolute altitude of concrete cushion 4.
Three) apply structure pile, structure pile adopts PHC pile tube 3, and PHC pile tube 3 is driven into the bottom of ground foundation ditch, and the degree of depth that enters bearing stratum should be greater than 1m.
Four) finish excavation of foundation pit;
Five) apply the hole base concrete bed course 4 of ground foundation ditch at the top of sand-gravel pile 2;
Six) apply underground structure 5 at concrete cushion 4, underground structure 5 comprises the structures such as base plate and side wall.
Above-mentioned job practices can be used for the foundation ditch back cover of integrated pipe canal and power tunnel engineering.
Although the above is described the preferred embodiments of the present invention by reference to the accompanying drawings; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away from the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (2)
1. the banded deep foundation ditch back cover of a soft foundation job practices is characterized in that, may further comprise the steps:
One) applies the supporting and protection structure of ground foundation ditch: apply steel sheet pile or bored pile along the ground both sides;
Two) reinforce at the bottom of adopting the hole of sand-gravel pile to the ground foundation ditch: in supporting and protection structure, sand-gravel pile is squeezed at the bottom of the hole of ground foundation ditch, and absolute altitude is identical at the bottom of making the high hole with the ground foundation ditch of the stake top mark of sand-gravel pile;
Three) apply structure pile, structure pile adopts the PHC pile tube;
Four) finish excavation of foundation pit;
Five) apply the hole base concrete bed course of ground foundation ditch at the top of sand-gravel pile;
Six) apply underground structure at concrete cushion.
2. the banded deep foundation ditch back cover of soft foundation according to claim 1 job practices is characterized in that described step 2), applying in the zone of sand-gravel pile, sand-gravel pile is evenly arranged, and two adjacent sand-gravel pile spacings are 2～4 times of sand-gravel pile diameters; The sand-gravel pile reinforcement depth is 3m～8m; The compound that the sand-gravel pile filler adopts medium coarse sand and the rubble by prototype gradation to form, the sandstone match ratio is 1:1～3, and the medium coarse sand mud content is not more than 5%, and the particle diameter of rubble is 20～40mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104360986A CN102966109A (en) | 2012-11-05 | 2012-11-05 | Method for constructing zonal deep foundation pit bottom sealing of soft soil foundation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104360986A CN102966109A (en) | 2012-11-05 | 2012-11-05 | Method for constructing zonal deep foundation pit bottom sealing of soft soil foundation |
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| CN102966109A true CN102966109A (en) | 2013-03-13 |
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| CN2012104360986A Pending CN102966109A (en) | 2012-11-05 | 2012-11-05 | Method for constructing zonal deep foundation pit bottom sealing of soft soil foundation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195067A (en) * | 2013-03-29 | 2013-07-10 | 中国十七冶集团有限公司 | Deep foundation pit muddy-silty clay cushion layer construction method |
| CN104404974A (en) * | 2014-12-01 | 2015-03-11 | 中铁隆工程集团有限公司 | High-pressure-bearing water and thick sand and pebble formation deep foundation pit grouting bottom-sealing structure and construction technology thereof |
| CN106884433A (en) * | 2017-03-02 | 2017-06-23 | 中交二航局第四工程有限公司 | Control vibrations pile pulling causes the structure of underground structure depression and control depression method |
| CN108755702A (en) * | 2018-06-22 | 2018-11-06 | 中水北方勘测设计研究有限责任公司 | A kind of higher soft soil foundation foundation ditch strengthening processing method of level of ground water |
| CN110130356A (en) * | 2019-06-05 | 2019-08-16 | 汕头市建筑工程总公司 | A kind of muddy soft soil area basement cheats bottom monoblock type back cover construction method |
Citations (5)
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| WO1996008609A1 (en) * | 1994-09-12 | 1996-03-21 | Richter, Wolfgang | Trench falsework system |
| JPH10114957A (en) * | 1996-10-09 | 1998-05-06 | Maeda Corp | Method of sand boiling-preventive construction in excavation work of shaft, etc. |
| CN101565949A (en) * | 2008-04-25 | 2009-10-28 | 中冶天工建设有限公司 | Forming method of large shallow foundation pit with soft soil foundation |
| CN102493458A (en) * | 2011-11-24 | 2012-06-13 | 天津二十冶建设有限公司 | Construction method for closing end of deep foundation pit steel sheet pile in soft soil foundation pipe trench and power tunnel engineering |
| CN102628265A (en) * | 2012-04-24 | 2012-08-08 | 天津二十冶建设有限公司 | Latticed steel sheet pile used in foundation pit support and manufacturing method for the same |
-
2012
- 2012-11-05 CN CN2012104360986A patent/CN102966109A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996008609A1 (en) * | 1994-09-12 | 1996-03-21 | Richter, Wolfgang | Trench falsework system |
| JPH10114957A (en) * | 1996-10-09 | 1998-05-06 | Maeda Corp | Method of sand boiling-preventive construction in excavation work of shaft, etc. |
| CN101565949A (en) * | 2008-04-25 | 2009-10-28 | 中冶天工建设有限公司 | Forming method of large shallow foundation pit with soft soil foundation |
| CN102493458A (en) * | 2011-11-24 | 2012-06-13 | 天津二十冶建设有限公司 | Construction method for closing end of deep foundation pit steel sheet pile in soft soil foundation pipe trench and power tunnel engineering |
| CN102628265A (en) * | 2012-04-24 | 2012-08-08 | 天津二十冶建设有限公司 | Latticed steel sheet pile used in foundation pit support and manufacturing method for the same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195067A (en) * | 2013-03-29 | 2013-07-10 | 中国十七冶集团有限公司 | Deep foundation pit muddy-silty clay cushion layer construction method |
| CN104404974A (en) * | 2014-12-01 | 2015-03-11 | 中铁隆工程集团有限公司 | High-pressure-bearing water and thick sand and pebble formation deep foundation pit grouting bottom-sealing structure and construction technology thereof |
| CN106884433A (en) * | 2017-03-02 | 2017-06-23 | 中交二航局第四工程有限公司 | Control vibrations pile pulling causes the structure of underground structure depression and control depression method |
| CN108755702A (en) * | 2018-06-22 | 2018-11-06 | 中水北方勘测设计研究有限责任公司 | A kind of higher soft soil foundation foundation ditch strengthening processing method of level of ground water |
| CN110130356A (en) * | 2019-06-05 | 2019-08-16 | 汕头市建筑工程总公司 | A kind of muddy soft soil area basement cheats bottom monoblock type back cover construction method |
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Application publication date: 20130313 |