CN103556554A - Bored pile composite foundation structure used for reinforcing soft foundations of embankment and construction method thereof - Google Patents

Bored pile composite foundation structure used for reinforcing soft foundations of embankment and construction method thereof Download PDF

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Publication number
CN103556554A
CN103556554A CN201310470407.6A CN201310470407A CN103556554A CN 103556554 A CN103556554 A CN 103556554A CN 201310470407 A CN201310470407 A CN 201310470407A CN 103556554 A CN103556554 A CN 103556554A
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embankment
drill bit
scalable
stake hole
stake
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CN201310470407.6A
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CN103556554B (en
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刘吉福
杨粤黔
安关峰
刘添俊
张洪彬
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GUANGZHOU MUNICIPAL ENGINEERING Co Ltd
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GUANGZHOU MUNICIPAL ENGINEERING Co Ltd
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Abstract

The invention discloses a bored pile composite foundation structure used for reinforcing soft foundations of an embankment. The structure comprises, from top to bottom, the embankment, a crust layer, a soft soil layer and a hard soil layer, wherein the embankment is provided with a plurality of pile holes, each pile hole passes from the embankment, then through the crust layer and the soft soil layer and finally to the hard soil layer, the diameter of the lower part of each pile hole is greater than the upper part of the pile hole, and a major diameter section starts from the lower end of the embankment and extends downwardly to the bottom of the pile hole. With the ground level as a boundary, the part of the pile hole above the boundary is filled with medium coarse sand, and the part of the pile hole below the boundary is filled with solidified cement paste, cement mortar or concrete. The invention further discloses a construction method for the bored pile composite foundation structure used for reinforcing soft foundations of the embankment. According to the invention, bored piles are arranged in the soft foundations of a road with diseases and form composite foundations with earth among the piles, so stability of a roadbed is enhanced, and roadbed settlement is reduced.

Description

Reinforce drilled pile composite foundation structure and the job practices thereof of the soft base of embankment
Technical field
The present invention relates to occur soft foundation processing technology under the existing highway embankment of the diseases such as excessive sedimentation or crack, be specifically related to a kind of drilled pile composite foundation structure and job practices thereof of reinforcing the soft base of embankment.
Background technology
Due to the reason such as differential settlement, subgrade stability be poor, after Soft Clay Foundation Shang highway is open to traffic, the phenomenon of pavement cracking is comparatively general.For guaranteeing driving quality, need to reinforce the soft foundation under existing highway embankment.Adopt CFG stake, pile tube, cement mixing method too large to roadbed pavement destruction, can not adopt; For reducing the destruction to subgrade and pavement, conventionally adopt slip casting, high-pressure rotary jet grouting pile etc. to reinforce.Engineering practice shows, in Soft Clay Foundation, slip casting belongs to fracture grouting, no matter is injecting grout through steel perforated pipe or the slip casting of sleeve valve pipe, is all difficult to form pile body, and consolidation effect is difficult to guarantee, and soil compaction effect is remarkable.During Construction of High Pressure Jet Grouting Pile, expulsion pressure is up to more than 25MPa, very serious to foundation soil disturbance, often causes crack and displacement, and it is large to return slurry amount, easily pollutes road surface.
Summary of the invention
The deficiency that the present invention exists in order to overcome above prior art, the drilled pile composite foundation structure of soft base under the embankment that disease appears in a kind of reinforcing is provided, in there is the highway soft foundation of disease, drilled pile is set, with inter-pile soil form compound foundation, thereby strengthen subgrade stability, minimizing subgrade settlement.
Another object of the present invention is to provide the job practices of the drilled pile composite foundation structure of reinforcing the soft base of embankment.
Object of the present invention realizes by following technical scheme: the drilled pile composite foundation structure of the soft base of this reinforcing embankment, comprise embankment, crust layer, Soft Soil Layer and hardpan from top to bottom, described embankment has some holes, each hole is through to hardpan from embankment through crust layer, Soft Soil Layer, the diameter in stake hole is up-small and down-big, and enlarged diameter section starts from embankment lower end until bottom, stake hole; Take ground line as line of demarcation, and line of demarcation is medium coarse sand in above stake hole, cement paste, cement mortar or concrete for solidifying in following stake hole, line of demarcation.
The diameter of the enlarged diameter section in described stake hole is 300-500mm, and the diameter of stake hole reduced diameter section is 110-150mm.
The job practices of the drilled pile composite foundation structure of the above-mentioned soft base of reinforcing embankment, comprises the following steps:
(1), get out the embankment of existing disease under the geological drill bit of geological drilling rig, the sleeve pipe retaining wall that follows up after geological drill bit, drill embankment after geological drill bit stop;
(2), on carry the geological drill bit of geological drilling rig, be replaced by scalable drill bit;
(3), at the bottom of scalable drill bit is transferred to hole after contraction, to the mud of filling with design density in stake hole, carry out retaining wall, geological drilling rig presses down and rotates, by the reaction force of crust layer and the centrifugal force of scalable bit, scalable drill bit is expanded, scalable drill bit is holed downwards to hardpan, when stake hole total depth arrives set depth L, stops boring;
(4), on carry scalable drill bit, scalable drill bit shrinks under deadweight and the restraint forces effect of stake hole, top reduced diameter section, will on scalable drill bit, mention ground;
(5) fill with stake.
It is grout injection or cement mortar that step (5) is filled with stake, method is: at the bottom of Grouting Pipe patchhole, grout injection or cement mortar are until the height of setting from bottom to top to utilize Grouting Pipe, and mud density is low, and in the process of grout injection or cement mortar, mud floating flows out embankment face; After cement paste or cement mortar are solidified, form cylinder pile, draw back sleeve pipe, to closely knit backfill medium coarse sand in stake hole to roadbed end face.
It is concrete perfusion that step (5) is filled with stake, method is: at the bottom of Grouting Pipe patchhole, in stake hole, throw in sandstone compound, utilize Grouting Pipe from bottom to top grout injection until the height of setting, mud density is low, and in the process of grout injection, mud floating flows out embankment face; After concrete setting, form cylinder pile, draw back sleeve pipe, to closely knit backfill medium coarse sand in stake hole to roadbed end face.
For avoiding the serious reaming of super soft foundation, it is concrete perfusion that step (5) is filled with stake, method is: at the soil engineering bag of a diameter 280-480mm of slip casting pipe box, at the bottom of Grouting Pipe patchhole, in soil engineering bag, throw in sandstone compound, grout injection is until the height of setting from bottom to top to utilize Grouting Pipe, and mud density is low, and in the process of grout injection, mud floating flows out embankment face; After concrete setting, form cylinder pile, draw back sleeve pipe, to closely knit backfill medium coarse sand in stake hole to roadbed end face.
The diameter of described geological drill bit is 110-150mm, and the maximum gauge of scalable drill bit is 300-500mm.
Described scalable drill bit comprises drill rod connector, 4 anchors and 4 scalable bars, 4 scalable bars are hinged by 4 anchors, form parallelogram sturcutre, being positioned at anchor is topmost arranged on drill rod connector, below 2 the scalable bars in below, be provided with brill tooth, drill rod connector is provided with the limiting section of the scalable bar open angle of restriction.
The present invention has advantages of as follows with respect to prior art:
(1) the technology of the present invention is applicable to occur the reinforcing of soft base under the embankment of the diseases such as excessive sedimentation or crack, utilize geological drilling rig, scalable drill bit occurring the Pile Driving in Soft Soil hole of the embankment of disease, bore diameter in embankment, road surface is 110-150mm, little to roadbed pavement destruction during construction stake;
(2) while holing in embankment, adopt sleeve pipe follow-up step to carry out retaining wall, avoided the immersion to embankment soil;
(3) stake hole adopts drilling tool to return and is drilled to hole, and relatively high pressure rotary churning pile utilizes the die-cut pore-forming of high-pressure fluid, and drilling diameter of the present invention more easily guarantees, ground is not had to soil compaction effect;
(4) when soft clay is very weak and throw in sand material, for avoiding reaming, can when transferring Grouting Pipe, puts into a ratio soil engineering bag of the little 10-20mm of diameter is set.
(5), in boring procedure, embankment is partly holed and is adopted sleeve pipe follow-up step retaining wall, Foundation Part boring to adopt the mud of filling with design density in stake hole to carry out retaining wall, avoids collapse hole or shrinkage cavity.
Accompanying drawing explanation
Fig. 1 is the drilled pile composite foundation structure sectional drawing of the soft base of reinforcing embankment of the present invention.
Fig. 2 is the construction schematic diagram that adopts soil engineering bag to carry out backfill.
Fig. 3 is scalable drill bit schematic diagram.
In figure: 1: embankment, 2: Soft Soil Layer, 3: stake hole, 4: hardpan, 5: drill rod connector, 6: anchor, 7: limiting section, 8: scalable bar, 9: bore tooth, 10: crust layer, 11: medium coarse sand, 12: soil engineering bag, 13: sleeve pipe, 14: Grouting Pipe, 15: mud discharge pipe joint.
The specific embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1:
The drilled pile composite foundation structure of the soft base of reinforcing embankment as shown in Figure 1, comprise embankment 1 from top to bottom, crust layer 10, Soft Soil Layer 2 and hardpan 4, embankment 1 has some holes, and (the horizontal number in stake hole is determined according to different embankments, longitudinal number in stake hole is determined according to the length that occurs disease embankment, spacing between stake hole is determined according to the stressing conditions of ground), crust layer 10 is passed from embankment 1 in each hole, Soft Soil Layer 2 is through to hardpan 4, the diameter in stake hole 3 is up-small and down-big, enlarged diameter section starts from embankment lower end until bottom, stake hole, take ground line as line of demarcation, line of demarcation is medium coarse sand 11 in above stake hole, cement sandstone for solidifying in following stake hole, line of demarcation.
The diameter of stake hole enlarged diameter section is 450mm, and the diameter of stake hole reduced diameter section is 130mm, and the depth H of enlarged diameter section is 13838mm.
The job practices of the drilled pile composite foundation structure of the above-mentioned soft base of reinforcing embankment, comprises the following steps:
(1), get out the embankment 1 of existing disease under the geological drill bit of geological drilling rig, sleeve pipe 13 retaining walls that follow up after geological drill bit, drill embankment 1 after geological drill bit stop;
(2), on carry the geological drill bit of geological drilling rig, be replaced by scalable drill bit;
(3), at the bottom of scalable drill bit is transferred to hole after contraction, to the mud of filling with design density in stake hole, carry out retaining wall, geological drilling rig presses down and rotates, by the reaction force of crust layer 10 and the centrifugal force of scalable bit, scalable drill bit is expanded, and scalable drill bit is holed downwards to hardpan 4, when stake hole total depth arrives set depth L, L=15.6m, stops boring;
(4), on carry scalable drill bit, scalable drill bit shrinks under deadweight and the restraint forces effect of stake hole, top reduced diameter section, will on scalable drill bit, mention ground;
(5) as shown in Figure 2, fill with stake: at the soil engineering bag 12 of a diameter 430mm of Grouting Pipe 14 covers, at the bottom of Grouting Pipe 14 patchholes, to the interior input sandstone of soil engineering bag 12 compound, utilize Grouting Pipe 14 from bottom to top grout injection until the height of setting, mud density is low, at the process mud floating outflow embankment face of grout injection; After concrete setting, form cylinder pile, draw back sleeve pipe 13, to stake hole 3, interior closely knit backfill medium coarse sand 11 is to roadbed end face.(concrete is exactly cement sandstone slurry)
The diameter of geological drill bit is 130mm, and the maximum gauge of scalable drill bit is 450mm.
As shown in Figure 3, scalable drill bit comprises 5,4 anchors 6 of drill rod connector and 4 scalable bars 8,4 scalable bars 8 are hinged by 4 anchors 6, form parallelogram sturcutre, being positioned at anchor 6 is topmost arranged on drill rod connector 5, tooth 9 is bored in being provided with below of 2 the scalable bars 8 in below, and drill rod connector 5 is provided with the limiting section 7 of scalable bar 8 open angles of restriction.
Embodiment 2:
Except following feature, all the other are with embodiment 1: the method that step (5) is filled with stake is: at the bottom of Grouting Pipe 14 patchholes, to stake hole 3 interior input sandstone compound, utilize Grouting Pipe 14 from bottom to top grout injection until the height of setting, mud density is low, and in the process of grout injection, mud floating flows out embankment face; After concrete setting, form cylinder pile, draw back sleeve pipe 13, to stake hole 3, interior closely knit backfill medium coarse sand 11 is to roadbed end face.
Embodiment 3:
Except following feature, all the other are with embodiment 1: the method that step (5) is filled with stake is: at the bottom of Grouting Pipe 14 patchholes, cement injection mortar is until the height of setting from bottom to top to utilize Grouting Pipe 14, and mud density is low, and in the process of cement injection mortar, mud floating flows out embankment face; After cement mortar is solidified, form cylinder pile, draw back sleeve pipe 13, to stake hole 3, interior closely knit backfill medium coarse sand 11 is to roadbed end face.
The above-mentioned specific embodiment is the preferred embodiments of the present invention, can not limit the present invention, and other any change or other equivalent substitute mode that does not deviate from technical scheme of the present invention and make, within being included in protection scope of the present invention.

Claims (8)

1. reinforce the drilled pile composite foundation structure of the soft base of embankment, it is characterized in that: comprise embankment, crust layer, Soft Soil Layer and hardpan from top to bottom, described embankment has some holes, each hole is through to hardpan from embankment through crust layer, Soft Soil Layer, the diameter in stake hole is up-small and down-big, and enlarged diameter section starts from embankment lower end until bottom, stake hole; Take ground line as line of demarcation, and line of demarcation is medium coarse sand in above stake hole, cement paste, cement mortar or concrete for solidifying in following stake hole, line of demarcation.
2. the drilled pile composite foundation structure of the soft base of reinforcing embankment according to claim 1, is characterized in that: the diameter of the enlarged diameter section in described stake hole is 300-500mm, and the diameter of stake hole reduced diameter section is 110-150mm.
3. the job practices of the drilled pile composite foundation structure of the soft base of reinforcing embankment according to claim 1, is characterized in that: comprise the following steps:
(1), get out the embankment of existing disease under the geological drill bit of geological drilling rig, the sleeve pipe retaining wall that follows up after geological drill bit, drill embankment after geological drill bit stop;
(2), on carry the geological drill bit of geological drilling rig, be replaced by scalable drill bit;
(3), at the bottom of scalable drill bit is transferred to hole after contraction, to the mud of filling with design density in stake hole, carry out retaining wall, geological drilling rig presses down and rotates, by the reaction force of crust layer and the centrifugal force of scalable bit, scalable drill bit is expanded, scalable drill bit is holed downwards to hardpan, when stake hole total depth arrives set depth L, stops boring;
(4), on carry scalable drill bit, scalable drill bit shrinks under deadweight and the restraint forces effect of stake hole, top reduced diameter section, will on scalable drill bit, mention ground;
(5) fill with stake.
4. the job practices of the drilled pile composite foundation structure of the soft base of reinforcing embankment according to claim 3, it is characterized in that: step (5) is filled with stake for grout injection or cement mortar, method is: at the bottom of Grouting Pipe patchhole, utilize Grouting Pipe from bottom to top grout injection or cement mortar until the height of setting, mud density is low, and in the process of grout injection or cement mortar, mud floating flows out embankment face; After cement paste or cement mortar are solidified, form cylinder pile, draw back sleeve pipe, to closely knit backfill medium coarse sand in stake hole to roadbed end face.
5. the job practices of the drilled pile composite foundation structure of the soft base of reinforcing embankment according to claim 3, it is characterized in that: step (5) is filled with stake for concrete perfusion, method is: at the bottom of Grouting Pipe patchhole, in stake hole, throw in sandstone compound, utilize Grouting Pipe from bottom to top grout injection until the height of setting, mud density is low, and in the process of grout injection, mud floating flows out embankment face; After concrete setting, form cylinder pile, draw back sleeve pipe, to closely knit backfill medium coarse sand in stake hole to roadbed end face.
6. the job practices of the drilled pile composite foundation structure of the soft base of reinforcing embankment according to claim 3, it is characterized in that: step (5) is filled with stake for concrete perfusion, method is: at the soil engineering bag of a diameter 280-480mm of slip casting pipe box, at the bottom of Grouting Pipe patchhole, in soil engineering bag, throw in sandstone compound, grout injection is until the height of setting from bottom to top to utilize Grouting Pipe, and mud density is low, and in the process of grout injection, mud floating flows out embankment face; After concrete setting, form cylinder pile, draw back sleeve pipe, to closely knit backfill medium coarse sand in stake hole to roadbed end face.
7. the job practices of the drilled pile composite foundation structure of the soft base of reinforcing embankment according to claim 3, is characterized in that: the diameter of described geological drill bit is 110-150mm, and the maximum gauge of scalable drill bit is 300-500mm.
8. the job practices of the drilled pile composite foundation structure of the soft base of reinforcing embankment according to claim 3, it is characterized in that: described scalable drill bit comprises drill rod connector, 4 anchors and 4 scalable bars, 4 scalable bars are hinged by 4 anchors, form parallelogram sturcutre, being positioned at anchor is topmost arranged on drill rod connector, below 2 the scalable bars in below, be provided with brill tooth, drill rod connector is provided with the limiting section of the scalable bar open angle of restriction.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103835203A (en) * 2014-02-28 2014-06-04 安徽省公路桥梁工程有限公司 Deep soft foundation back-jacking light road embankment structure and construction method thereof
CN104179105A (en) * 2014-08-27 2014-12-03 中国地质大学(武汉) Top-down rigid pile compound foundation construction method
CN104480956A (en) * 2014-10-31 2015-04-01 上海市政工程设计研究总院(集团)有限公司 Small-diameter mold-bagged concrete pile composite foundation
CN106948233A (en) * 2017-03-15 2017-07-14 温州市阳光建设有限公司 A kind of town road asphalt concrete construction method
CN110886614A (en) * 2019-10-22 2020-03-17 中交第二航务工程局有限公司 Construction method for treating upper soft and lower hard stratum by using triple-pipe rotary jet grouting pile

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CN101130975A (en) * 2007-07-23 2008-02-27 安蓉建设总公司 Filling pile construction method for machine drill end oversize reaming and its special apparatus
CN202830675U (en) * 2012-09-06 2013-03-27 中铁二院工程集团有限责任公司 Deep and thick soft soil composite floating pile foundation damage reinforcement structure
CN202945519U (en) * 2012-12-05 2013-05-22 浙江华光市政建设有限公司 Reinforced structure for controlling embankment settlement during operational period
CN203514141U (en) * 2013-10-09 2014-04-02 广州市市政集团有限公司 Drilling pile composite foundation structure for reinforcing soft ground under highway embankment

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Publication number Priority date Publication date Assignee Title
JP3653083B2 (en) * 2003-01-23 2005-05-25 株式会社ダイヤコンサルタント Road construction method
CN101130975A (en) * 2007-07-23 2008-02-27 安蓉建设总公司 Filling pile construction method for machine drill end oversize reaming and its special apparatus
CN202830675U (en) * 2012-09-06 2013-03-27 中铁二院工程集团有限责任公司 Deep and thick soft soil composite floating pile foundation damage reinforcement structure
CN202945519U (en) * 2012-12-05 2013-05-22 浙江华光市政建设有限公司 Reinforced structure for controlling embankment settlement during operational period
CN203514141U (en) * 2013-10-09 2014-04-02 广州市市政集团有限公司 Drilling pile composite foundation structure for reinforcing soft ground under highway embankment

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103835203A (en) * 2014-02-28 2014-06-04 安徽省公路桥梁工程有限公司 Deep soft foundation back-jacking light road embankment structure and construction method thereof
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CN104179105A (en) * 2014-08-27 2014-12-03 中国地质大学(武汉) Top-down rigid pile compound foundation construction method
CN104179105B (en) * 2014-08-27 2017-06-13 中国地质大学(武汉) A kind of contrary sequence method rigid pile composite foundation construction method
CN104480956A (en) * 2014-10-31 2015-04-01 上海市政工程设计研究总院(集团)有限公司 Small-diameter mold-bagged concrete pile composite foundation
CN104480956B (en) * 2014-10-31 2017-06-27 上海市政工程设计研究总院(集团)有限公司 A kind of minor diameter mold-bagged concrete pile composite foundation
CN106948233A (en) * 2017-03-15 2017-07-14 温州市阳光建设有限公司 A kind of town road asphalt concrete construction method
CN110886614A (en) * 2019-10-22 2020-03-17 中交第二航务工程局有限公司 Construction method for treating upper soft and lower hard stratum by using triple-pipe rotary jet grouting pile

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