CN102493458A - Construction method for closing end of deep foundation pit steel sheet pile in soft soil foundation pipe trench and power tunnel engineering - Google Patents
Construction method for closing end of deep foundation pit steel sheet pile in soft soil foundation pipe trench and power tunnel engineering Download PDFInfo
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- CN102493458A CN102493458A CN2011103778730A CN201110377873A CN102493458A CN 102493458 A CN102493458 A CN 102493458A CN 2011103778730 A CN2011103778730 A CN 2011103778730A CN 201110377873 A CN201110377873 A CN 201110377873A CN 102493458 A CN102493458 A CN 102493458A
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Abstract
The invention discloses a construction method for closing an end of a deep foundation pit steel sheet pile in soft soil foundation pipe trench and power tunnel engineering, which includes the steps: firstly, stopping excavating soil in foundation pit excavating when a designed elevation of the bottom of a pit is 0.8-1.2m away; secondly, excavating soil around a row of concrete tubular piles, and forming a foundation trench between two opposite steel sheet piles; thirdly, casting concrete into the foundation trench to form a concealed beam, and making sure the elevation of the top of the concealed beam the same as the designed elevation of the pit bottom; fourthly, excavating soil around another row of PHCs (prestress high concrete) to form another foundation trench; fifthly, performing the third step again; sixthly, performing the fourth step and the fifth step again till construction of all concealed beams is complete; seventhly, excavating soil between the adjacent concealed beams to a depth at least 5cm below the designed elevation of the pit bottom when the strength of the concrete in the foundation trenches reaches 60% of the designed strength of the concrete; and eighthly, constructing concrete cushions at the bottom of the pit. By means of the method, construction period can be shortened, construction cost can be reduced, and engineering quality is convenient to control.
Description
Technical field
The present invention relates to the anti-protuberance of a kind of steel sheet pile foundation ditch job practices, particularly relate to a kind of soft foundation pipe trench and electric power tunnel engineering deep foundation ditch steel sheet pile back cover job practices.
Background technology
General deep foundation ditch steel sheet pile back cover adopts cement mixing pile to construct.The cement mixing pile long construction period also can cause serious environmental to pollute, and could earth excavation after needing wait to reach intensity in 28 days.Long in time limit, construction cost is high.Particularly for long integrated pipe canal and electric power tunnel engineering, and foundation depth is darker, for example-4.50～-7.70m; Average length 30m is provided with deformation joint one; Adopt above-mentioned existing deep foundation ditch steel sheet pile back cover technology, long in time limit, the problem that construction cost is high can be more outstanding.
Summary of the invention
The present invention provides a kind of soft foundation integrated pipe canal and electric power tunnel engineering deep foundation ditch steel sheet pile back cover job practices for solving the technical problem that exists in the known technology, adopts this method can the reduction of erection time, reduces construction cost, and is 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: comprehensive parent tube ditch in a kind of weak soil ground and electric power tunnel engineering deep foundation ditch steel sheet pile back cover job practices may further comprise the steps:
When one) excavation of foundation pit to distance is cheated end design elevation 0.8～1.2m, stop to cheat interior soil excavation;
Two) excavate the concrete tubular pile earthwork on every side that a certain row arranges along the foundation ditch width in the hole, formation is lower than the hole foundation trench at the end between two relative steel sheet piles;
Three) concreting in foundation trench forms dark beam, and the absolute altitude of dark top surface of the beam is identical with hole end design elevation;
Four) earth excavation around another row PHC pile tube forms another foundation trench;
Five) repeating step three);
Six) repeating step four) and step 5), up to the construction of accomplishing all dark beam;
Seven) treat the foundation trench inner concrete reach its design strength at least 60% the time, excavate the earthwork between the adjacent dark beam to cheating below the end design elevation 5cm at least;
Eight) construction hole base concrete bed course forms the concrete cushion of thickening between the dark beam.
Said step 3), before concreting, two-layer malthoid is set in the steel sheet pile inboard.
One arrange concrete tubular pile at interval between the dark beam of adjacent twice.
Advantage and good effect that the present invention has are: 1) adopt the dark girder construction of concrete, in soft foundation excavation back the PHC pile tube is protected, guaranteed that the PHC pile tube behind the soft foundation excavation, lateral displacement does not take place destroy; 2) the dark beam of concrete has been avoided steel sheet pile bottom run-off the straight as the horizontal support of steel sheet pile, causes " skirt " phenomenon to take place, so that whole supporting and protection structure is destroyed; 3) shortened construction period; 4) having reduced construction cost 5) the present invention is simple and easy to do, is convenient to the Control Engineering quality, and efficient is high, and is safe and reliable, reduced labour intensity to a great extent, improved operating efficiency, saved human and material resources and financial resources.
Description of drawings
Fig. 1 is for using structural representation of the present invention;
Fig. 2 is the A-A sectional drawing of Fig. 1.
Among the figure: 1, dark beam, 2, concrete thickening bed course, 3, concrete cushion, 4, the PHC pile tube, 5, steel sheet pile.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect; Now newly developed area, Hengqin, the Zhuhai City municipal administration of giving an example infrastructure BT project exemplary segment master, secondary trunk road town road engineering A# road integrated pipe canal and electric power tunnel are embodied as example, and conjunction with figs. specifies as follows:
See also Fig. 1～Fig. 2, a kind of soft foundation A# road integrated pipe canal and electric power tunnel engineering deep foundation ditch steel sheet pile back cover job practices may further comprise the steps:
When one) excavation of foundation pit to distance is cheated end design elevation 0.8～1.2m, stop to cheat interior soil excavation;
Two) use the earthwork around the PHC pile tube (prestressed high strength concrete pile tube) 4 that a certain row in the large-scale long-armed excavator excavation hole arranges along the foundation ditch width, the dark foundation trench of 1m of formation wide 1.6 between two relative steel sheet piles 5;
Three) adopt the C20 concrete, utilize automotive pump concreting in above-mentioned foundation trench, it is wide to form 1m, the dark beam 1 that 0.6m is high, and the absolute altitude of dark beam 1 end face is identical with hole end design elevation;
Before concreting, in the steel sheet pile inboard two-layer malthoid is set, be used for concrete and steel sheet pile are separated, help steel sheet pile and extract;
Four) at a distance from a row PHC pile tube 4, earth excavation around next row PHC pile tube 4 forms next foundation trench;
Five) repeating step three);
Six) repeating step four) and step 5), up to the construction of accomplishing all dark beam 1;
The every arrangement of present embodiment at a distance from the together dark beam of a row PHC pile tube setting; Mainly take all factors into consideration from cost and structural safety two aspects; According to the concrete condition of engineering, also together dark beam can be set all around every row PHC pile tube, at interval two rows or three row PHC pile tubes; Cost and structural safety around next row PHC pile tube, together dark beam be set, as long as all can meet the demands.
Seven) treat concrete reach its intensity at least 60% the time, after about 3 days, when concrete reaches 12MPa, excavate the earthwork between the dark beam 1 to cheating below the end design elevation 5cm at least;
Eight) construction hole base concrete bed course forms the thick concrete thickening bed course 2 of 0.15m between the dark beam, form the thick concrete cushion 3 of 0.1m on the dark beam 1.Hole base concrete bed course can section construction.
Present embodiment adopts the dark beam construction technology of concrete, adopts the dark beam protection of concrete PHC pile tube in mud, not to be subjected to displacement; The dark beam of concrete is played a supporting role to steel sheet pile simultaneously.
Although combine accompanying drawing that the preferred embodiments of the present invention are described above; But the present invention is not limited to the above-mentioned specific embodiment, and the above-mentioned specific embodiment only is schematically, is not restrictive; Those of ordinary skill in the art is under enlightenment of the present invention; Not breaking away under 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 (3)
1. soft foundation pipe trench and electric power tunnel engineering deep foundation ditch steel sheet pile back cover job practices is characterized in that, may further comprise the steps:
When one) excavation of foundation pit to distance is cheated end design elevation 0.8～1.2m, stop to cheat interior soil excavation;
Two) excavate the concrete tubular pile earthwork on every side that a certain row arranges along the foundation ditch width in the hole, formation is lower than the hole foundation trench at the end between two relative steel sheet piles;
Three) concreting in foundation trench forms dark beam, and the absolute altitude of dark top surface of the beam is identical with hole end design elevation;
Four) earth excavation around another row PHC pile tube forms another foundation trench;
Five) repeating step three);
Six) repeating step four) and step 5), up to the construction of accomplishing all dark beam;
Seven) treat the foundation trench inner concrete reach its design strength at least 60% the time, excavate the earthwork between the adjacent dark beam to cheating below the end design elevation 5cm at least;
Eight) construction hole base concrete bed course forms the concrete cushion of thickening between the dark beam.
2. soft foundation pipe trench according to claim 1 and electric power tunnel engineering deep foundation ditch steel sheet pile back cover job practices is characterized in that said step 3), before concreting, two-layer malthoid is set in the steel sheet pile inboard.
3. soft foundation pipe trench according to claim 1 and electric power tunnel engineering deep foundation ditch steel sheet pile back cover job practices is characterized in that, one arrange concrete tubular pile at interval between the dark beam of adjacent twice.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103778730A CN102493458A (en) | 2011-11-24 | 2011-11-24 | Construction method for closing end of deep foundation pit steel sheet pile in soft soil foundation pipe trench and power tunnel engineering |
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| CN2011103778730A CN102493458A (en) | 2011-11-24 | 2011-11-24 | Construction method for closing end of deep foundation pit steel sheet pile in soft soil foundation pipe trench and power tunnel engineering |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102787605A (en) * | 2012-08-07 | 2012-11-21 | 天津二十冶建设有限公司 | Method for inclining bar-type foundation pit support steel sheet pile of soft soil foundation |
| CN102966109A (en) * | 2012-11-05 | 2013-03-13 | 天津二十冶建设有限公司 | Method for constructing zonal deep foundation pit bottom sealing of soft soil foundation |
| CN102979098A (en) * | 2012-11-16 | 2013-03-20 | 中铁三局集团有限公司 | Construction method for rapidly processing soft soil foundation |
| CN103590405A (en) * | 2013-10-25 | 2014-02-19 | 上海建工四建集团有限公司 | Foundation pit construction method |
| CN105019468A (en) * | 2015-07-31 | 2015-11-04 | 上海市政工程设计研究总院（集团）有限公司 | Reinforced foundation structure |
| CN105133631A (en) * | 2015-07-31 | 2015-12-09 | 上海市政工程设计研究总院（集团）有限公司 | Construction method for reinforced type foundation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102787605A (en) * | 2012-08-07 | 2012-11-21 | 天津二十冶建设有限公司 | Method for inclining bar-type foundation pit support steel sheet pile of soft soil foundation |
| CN102966109A (en) * | 2012-11-05 | 2013-03-13 | 天津二十冶建设有限公司 | Method for constructing zonal deep foundation pit bottom sealing of soft soil foundation |
| CN102979098A (en) * | 2012-11-16 | 2013-03-20 | 中铁三局集团有限公司 | Construction method for rapidly processing soft soil foundation |
| CN103590405A (en) * | 2013-10-25 | 2014-02-19 | 上海建工四建集团有限公司 | Foundation pit construction method |
| CN105019468A (en) * | 2015-07-31 | 2015-11-04 | 上海市政工程设计研究总院（集团）有限公司 | Reinforced foundation structure |
| CN105133631A (en) * | 2015-07-31 | 2015-12-09 | 上海市政工程设计研究总院（集团）有限公司 | Construction method for reinforced type foundation |
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Application publication date: 20120613 |