CN101761073A - Improved construction technology of CFG (cement fIying-ash gravel) pile - Google Patents
Improved construction technology of CFG (cement fIying-ash gravel) pile Download PDFInfo
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- CN101761073A CN101761073A CN201010019478A CN201010019478A CN101761073A CN 101761073 A CN101761073 A CN 101761073A CN 201010019478 A CN201010019478 A CN 201010019478A CN 201010019478 A CN201010019478 A CN 201010019478A CN 101761073 A CN101761073 A CN 101761073A
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Abstract
The invention discloses an improves construction technology of a CFG (cement fIying-ash gravel) pile, which is characterized by comprising the following steps of: A, punching and plunging a pile pipe; B, arranging a high-pressure grouting pipe into the plunged pile pipe, and adding aggregates, wherein the aggregates can be gravels or mixed materials of gravels and sands which are prepared in proportion; C, pulling the pile pipe out, and tamping the aggregates inside a hole; D, building a plurality of pile points on a plurality of piling positions by repeating the steps; E, cleaning the hole of each pile point and grouting the hole of each pile point by pressure, i.e. firstly injecting water into the hole through the high-pressure grouting pipe, and cleaning the hole and the aggregates inside the hole till clear water overflows out of an orifice; and then grouting pulverized fuel ash cement paste or pulverized fuel ash cement plaster into the hole filled with the aggregates by using the high-pressure grouting pipe till grouts are burst out of the orifice. The invention can effectively enhance the carrying capacity of the CFG pile and the bonding degree of the pile and soil bodies and effectively prevent the defects of necking down, pile breakage and pile body clamping soil, has extensive application, and can be suitable for various geological conditions.
Description
Technical field
The present invention relates to the improvement construction technology of CFG stake in a kind of subgrade construction.
Background technology
CFG stake (Cement Fly-ash Gravel pile) is a CFG, on plain concrete pile foundation technology, grow up, mainly by rubble, aggregate chips (or sand), flyash and mix an amount of cement and water mix and stir form have certain binding strength the stake.The CFG pile composite foundation technology is used widely at speedway.Current service level after the quality quality of CFG pile driving construction directly influenced the settlement after construction of roadbed and speedway and build up, so whole roadbed is stable, and therefore, the construction quality of control CFG stake is the key link of CFG pile composite foundation.
The construction of CFG stake at present mainly is the vibration sinking tube pouring construction, the major technique of its construction is, ground base segment in needs piling, the immersed tube of holing at first downwards, then with rubble, aggregate chips (or sand), flyash is also mixed an amount of cement and after water is mixed into the concrete pile material by a certain percentage, directly send in the immersed tube, just can disposable pile, because of its work efficiency height, cost is low, advantage such as flexible is subjected to people's generally attention at home and abroad, but there is defective in this construction technology to the pile quality of CFG to a certain extent: (1) construction disturbance causes the intensity of soil to reduce.Particularly closely knit sand or the silt pine that can shake causes structural strength, the density of soil to reduce, and bearing capacity reduces; (2) necking down and broken pile.When adopt connecting when playing operation, the extruding of newly driving piles to having driven piles, feasible piling is squeezed into irregularly shapedly, can produce necking down in the time of seriously; Employing is jumped the skill of doing manual work every stake, if the hard intensity of knot of having driven piles is not too high again, when the new stake of middle complement, having driven piles is shaken sometimes splits; (3) pile body segregation.When the high place pile of groundwater table, when the stake pipe shakes down for the first time, reach groundwater table soon.Underground water enters the stake pipe with the tip flap valve, and when concrete went into to manage, the water in the pipe had a diluting effect to concrete, adds more intense following shaking, and makes it to change into the concrete proportioning of pipe, causes pile segregation phenomenon to occur; (4) pile body folder soil.When the stake pipe sinks to running into very hard stratum, or when reaching bearing stratum, beating upwards can take place to come and go in the stake pipe, and the phenomenon of closing when opening when flap valve may occur will be grabbed the soil body in the inlet pipe like this; If adopt the anti-method of alternating, because stake pipe verticality is difficult to guarantee that anti-inserting makes soil mix with material of body of a pile easily, causes pile body to mix defectives such as soil, had a strong impact on the supporting capacity of CFG stake.
In sum, the quality of vibration sinking tube CFG stake is difficult to control in construction, and also has many defectives, therefore is necessary its construction technology is improved.
Summary of the invention
In order to overcome above-mentioned deficiency, the object of the present invention is to provide and a kind ofly can improve CFG pile bearing capacity and the stake and the caking ability of the soil body, can effectively avoid the improvement construction technology of the CFG stake of necking down and broken pile.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: the improvement construction technology of CFG stake, and its technical step comprises: A, layout stake position: in construction area, determine the number of CFG stake, and the position distribution of definite CFG stake; B, in the place punching of stake position and sink to the stake pipe; It is characterized in that technical step also comprises: C, lay the high-pressure slip-casting pipe in the pipe and throw in aggregate in the stake of avaling, aggregate can be rubble or the rubble of preparation in proportion and the compound of sand; D, extract stake pipe and the aggregate in the hole is done compacting handle; E, cleaning treatment:, aggregate in hole and the hole is cleaned, till clear water is overflowed in the aperture by water filling in the high-pressure slip-casting Guan Xiangkong; F, grouting pile-forming: utilize the high-pressure slip-casting pipe in input has the hole of aggregate, to inject ash cement slurry or pulverized fuel ash cement mortar, after slurries are emerged from the aperture, stop slip casting, extract the construction of just having finished the CFG stake behind the high-pressure slip-casting pipe.
Among the described step C, the lower end of high-pressure slip-casting pipe is placed to above 20cm place at the bottom of the hole, and 50-100cm basset in the upper end; The size of described rubble is 2-4cm, and sand is medium coarse sand, and mud content is no more than 3%.
Among the described step D, the stake pipe speed of extracting is controlled at 1.2～1.5m/min, is mud or mucky soil for the soil property of pile driving position, and the speed that the stake pipe is extracted will be lower than 1.2m/min.
In the described step F, the water/binder ratio of described ash cement slurry is controlled at 0.4-0.5; The water/binder ratio of described pulverized fuel ash cement mortar is to be controlled at 0.5-0.6.
Described step D finishes, can carry out implementation step B, step C, step D respectively near other a plurality of the positions this position after, and then concentrate hole and aggregate to carry out implementation step E, step F to above-mentioned stake position.This technology adopts continuous construction operation method, need not jump and beat, after having beaten a plurality of holes and tamped aggregate continuously, carry out hole slip casting clearly again, avoided because contiguous the construction the harmful effect of pile, near the fracture of the stake of newly accomplishing fluently also well having avoided, simultaneously necking has also been obtained good improvement, in addition, can be before pile to the length of stake, the injection quality in hole is carried out strict monitoring, thereby guarantees the quality of stake.
Beneficial effect of the present invention is: owing to adopt slip casing by pressure, solved the construction disturbance and caused the intensity of soil to reduce problem, stake is combined closely with the soil body, the native skin friction of stake is bigger, has advantages of high bearing capacity; Adopt the clear hole of Grouting Pipe to clear up from a small amount of soil that the stake end enters can be to counterbore the time, also can clean, help better boning with slurries to rubble and sand; The present invention is applicable to miscellaneous fill, and plain fill, gravelly soil, sand, cohesive soil, collapsible loess, expansive soil etc. are the matter condition variously, both applicable to more than the groundwater table, also is applicable to below the groundwater table.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
Fig. 1 is the construction schematic diagram of CFG stake of the present invention.
Among the figure: 1, ground; 2, hole; 3, stake pipe; 4, high-pressure slip-casting pipe; 5, aggregate; 6, the not stake of slip casting; 7, the stake after the slip casting.
The specific embodiment
As shown in Figure 1, the improvement construction technology of CFG stake, its technical step may further comprise the steps: a, the stake machine in place: the leveling place after, measure good each the position of setting-out according to designing requirement, adjust the direction and the angle that sinks to a pipe of stake machine, pile position deviation and verticality are all in the standard permissible range.
B, vibration sinking tube machine pore-forming: the vibration sinking tube machine punches 2 in the position of piling, behind the pile-forming machine perching, and starter, stake is shut down after managing predetermined absolute altitude.
C, lay high-pressure slip-casting pipe 4 and throw in aggregate 5: in stake pipe 3, lay high-pressure slip-casting pipe 4 after the shutdown immediately; high-pressure slip-casting pipe 4 must be placed to 20cm at the bottom of the hole; place the aggregate 5 that begins behind the high-pressure slip-casting pipe to throw in by the design proportioning; aggregate 5 is a rubble; rubble requires the rubble of 2-4cm; all must check to meet code requirement, the aggregate of input calculates by fullness coefficient 1.05.
D, starter stay the 5～10s that shakes, and begin to extract the stake pipe: tube drawing speed is generally 1.2～1.5m/min (pipe-pulling speed is a linear velocity, is not average speed), and as mud or mucky soil, pipe-pulling speed also should slow down.Do not allow anti-inserting in the tube drawing process.As the material loading deficiency; must be in the tube drawing process feed supplement in time; to protect the high-pressure slip-casting pipe in the feed supplement process; in order to avoid the high-pressure slip-casting pipe is buried by aggregate; the stake pipe is extracted ground; pulled out a stake Guan Houyong ballast consolidating machine aggregate in the hole is tamped processing, the necking down influence that this measure brings in the time of can reducing the injection adjacent studs must guarantee that basset 1 length of high-pressure slip-casting pipe is 50-100cm simultaneously.
E, the continuous construction operation method of employing need not be jumped and be beaten, and in a plurality of positions of needs piling, set up a plurality of points according to the continuous construction of abovementioned steps.
F, each point is carried out hole clearly: it is relatively more muddy to extract in the Guan Shikong water, can utilize the high-pressure slip-casting pipe to clean, and the size of control pressure of supply water till clear water is overflowed in the aperture, is extracted the construction of just having finished the CFG stake behind the high-pressure slip-casting pipe.
G, grouting pile-forming: according to designing requirement, slurries are ash cement slurry, and slurries adopt 42.5 grades or 52.5 grades of Portland cements.The water/binder ratio of pure fly-ash cement slurry generally is controlled at about 0.4-0.5.
Essentials for Construction Control: strict control tube drawing speed: should strict control tube drawing speed in saturated soft soil.Tube drawing speed may cause the less than normal or necking down broken pile in stake footpath too soon; In the perfusion mud jacking process, slurries run off in the soil body, and space or honeycomb appear in pile body, then adopt the interval secondary mud jacking, until the aperture underflow of gushing out; Run off in a large number along the stratum for preventing perforation and slurries in the slip casting process, in a row must take to construct intermittence during pile driving construction or add measure such as accelerating admixture; Sediment mud density blocked up and that mud jacking is preceding is excessive at the bottom of must preventing the hole in the work progress, guarantees effective length and grouting smoothly, and this is mainly by the solution of clear hole; The outlet of Grouting Pipe is embedded in the slurries.
Operating principle: this technology mainly is to rely on the slip casing by pressure principle, promptly is that immersed tube sinks to design elevation by vibrator sunk pile machine pore-forming, and Grouting Pipe is installed then, carries out hole clearly behind the input aggregate, carries out the slip casing by pressure pile at last.
Embodiment:
In order to verify the feasibility of this worker's method, verify that at wide Chinese parasol tree speedway CFG stake treatment of soft foundation section get two sections and make comparisons, section A adopts not improved CFG pile construction technology, test pile length is 8.5m, has 1202; Section B adopts improved CFG stake treatment technology, test pile length is 8.5m, have 1234, the diameter of CFG stake all is 50cm, the spacing of stake all is 1.5m, adopt quincunx full hall to arrange, the equal compliant requirement of construction material therefor, construction finish to reach after the length of time, according to " highway subgrade construction technique normalizing " (JTG F10-2006) requirement, section A does 3 bearing capacity of single piles and 1 Bearing Capacity of Composite Foundation, and 60 detections of loosing core, section B does 3 bearing capacity of single piles and 1 Bearing Capacity of Composite Foundation, and 62 detections of loosing core, entrust to detect unit it detected respectively, testing result as shown in Table 1 and Table 2:
Table 1 single pile and Bearing Capacity of Composite Foundation comparison sheet
The table 2CFG stake comparison sheet as a result of loosing core
In the table 2, the stake of I class is meant the CFG stake that the construction disturbance causes the intensity of soil to reduce; The stake of II class is meant necking down and broken pile; The stake of III class is meant the CFG stake of pile body segregation; The stake of IV class is meant the CFG stake of pile body folder soil.
The CFG stake single pile of B section and Bearing Capacity of Composite Foundation all obviously are better than the A section as can be seen from Table 1, this mainly is that improved CFG pile construction technology has adopted slip casing by pressure technology, the soil body and stake can better be combined, better obviously to the control effect of sedimentation, the I class stake of A section has 42 in the table 2, account for 70%, the stake of IV class is unexpectedly up to 15%; The I class stake of B section the stake of IV class do not occur up to 93.5%, notices that from the process of loosing core many broken piles have appearred in the A section, and the IV class stake of appearance all is that segregation is arranged, and does not bond between aggregate, has had a strong impact on the bearing capacity of stake; And the B section is not find this type of phenomenon, we can say that therefore it is feasible adopting improved CFG pile construction technology, satisfies code requirement.
Claims (5)
1. the improvement construction technology of a CFG stake, its technical step comprises: A, arrange the stake position: in construction area, determine the number of CFG stake, and the position distribution of definite CFG stake; B, in the place punching of stake position and sink to the stake pipe; It is characterized in that technical step also comprises: C, lay the high-pressure slip-casting pipe in the pipe and throw in aggregate in the stake of avaling, aggregate can be rubble or the rubble of preparation in proportion and the compound of sand; D, extract stake pipe and the aggregate in the hole is done compacting handle; E, cleaning treatment:, aggregate in hole and the hole is cleaned, till clear water is overflowed in the aperture by water filling in the high-pressure slip-casting Guan Xiangkong; F, grouting pile-forming: utilize the high-pressure slip-casting pipe to inject ash cement slurry or pulverized fuel ash cement mortar in input has the hole of aggregate, after slurries are emerged from the aperture, stop slip casting, extract the high-pressure slip-casting pipe, construction finishes.
2. the improvement construction technology of CFG stake according to claim 1 is characterized in that: among the described step C, the lower end of high-pressure slip-casting pipe is placed to above 20cm place at the bottom of the hole, and 50-100cm basset in the upper end; The size of described rubble is 2-4cm, and sand is medium coarse sand, and mud content is no more than 3%.
3. the improvement construction technology of CFG stake according to claim 1, it is characterized in that: among the described step D, the stake pipe speed of extracting is controlled at 1.2～1.5m/min, is mud or mucky soil for the soil property of pile driving position, and the speed that the stake pipe is extracted will be lower than 1.2m/min.
4. the improvement construction technology of CFG stake according to claim 1 is characterized in that: in the described step F, the water/binder ratio of described ash cement slurry is controlled at 0.4-0.5; The water/binder ratio of described pulverized fuel ash cement mortar is to be controlled at 0.5-0.6.
5. the improvement construction technology of CFG stake according to claim 1, it is characterized in that: described step D finishes, after can carrying out implementation step B, step C, step D respectively near other a plurality of the positions this position, and then concentrate hole and aggregate to carry out implementation step E, step F to above-mentioned stake position.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010019478A CN101761073A (en) | 2010-01-19 | 2010-01-19 | Improved construction technology of CFG (cement fIying-ash gravel) pile |
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| CN201010019478A CN101761073A (en) | 2010-01-19 | 2010-01-19 | Improved construction technology of CFG (cement fIying-ash gravel) pile |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962950A (en) * | 2010-09-14 | 2011-02-02 | 北京建材地质工程公司 | Long-spiral spray stirring vibration pipe sinking CFG (Cement Flyash Gravel) pile construction method and CFG composite file therefrom |
| CN102322057A (en) * | 2011-06-30 | 2012-01-18 | 广东省长大公路工程有限公司 | Grouting type cement fly-ash gravel (CFG) pile construction method with continuous construction operation function |
| CN102477737A (en) * | 2010-11-29 | 2012-05-30 | 中冶天工集团有限公司 | Construction method of cement fly-ash gravel (CFG) pile on collapsible loess foundation of highway |
| CN102839656A (en) * | 2012-09-25 | 2012-12-26 | 吴良斌 | Construction technology for cement flyash gravel (CFG) pile |
| CN103966996A (en) * | 2013-01-25 | 2014-08-06 | 深圳市勘察测绘院有限公司 | Gravel pile and manufacturing method thereof |
| CN106007503A (en) * | 2016-05-20 | 2016-10-12 | 化学工业岩土工程有限公司 | Method for constructing construction waste pile |
| CN106284311B (en) * | 2016-08-31 | 2018-06-05 | 山东电力工程咨询院有限公司 | A kind of dry efficient construction technology of pore-forming cast-in-place concrete pile of rotary drilling rig |
| CN108797578A (en) * | 2018-07-12 | 2018-11-13 | 上海市城市建设设计研究总院（集团）有限公司 | Crushed stone grouting pile and its construction method with classification enlarged footing |
| CN111997035A (en) * | 2020-09-04 | 2020-11-27 | 广州市大新特种建筑新技术开发有限公司 | Construction method for newly added steel pipe pile of high-water-level basement |
-
2010
- 2010-01-19 CN CN201010019478A patent/CN101761073A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962950A (en) * | 2010-09-14 | 2011-02-02 | 北京建材地质工程公司 | Long-spiral spray stirring vibration pipe sinking CFG (Cement Flyash Gravel) pile construction method and CFG composite file therefrom |
| CN102477737A (en) * | 2010-11-29 | 2012-05-30 | 中冶天工集团有限公司 | Construction method of cement fly-ash gravel (CFG) pile on collapsible loess foundation of highway |
| CN102322057A (en) * | 2011-06-30 | 2012-01-18 | 广东省长大公路工程有限公司 | Grouting type cement fly-ash gravel (CFG) pile construction method with continuous construction operation function |
| CN102839656A (en) * | 2012-09-25 | 2012-12-26 | 吴良斌 | Construction technology for cement flyash gravel (CFG) pile |
| CN103966996A (en) * | 2013-01-25 | 2014-08-06 | 深圳市勘察测绘院有限公司 | Gravel pile and manufacturing method thereof |
| CN106007503A (en) * | 2016-05-20 | 2016-10-12 | 化学工业岩土工程有限公司 | Method for constructing construction waste pile |
| CN106284311B (en) * | 2016-08-31 | 2018-06-05 | 山东电力工程咨询院有限公司 | A kind of dry efficient construction technology of pore-forming cast-in-place concrete pile of rotary drilling rig |
| CN108797578A (en) * | 2018-07-12 | 2018-11-13 | 上海市城市建设设计研究总院（集团）有限公司 | Crushed stone grouting pile and its construction method with classification enlarged footing |
| CN111997035A (en) * | 2020-09-04 | 2020-11-27 | 广州市大新特种建筑新技术开发有限公司 | Construction method for newly added steel pipe pile of high-water-level basement |
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Open date: 20100630 |