CN103556555A - Nail-shaped bored pile compound foundation structure for reinforcing embankment soft foundation, and construction method thereof - Google Patents
Nail-shaped bored pile compound foundation structure for reinforcing embankment soft foundation, and construction method thereof Download PDFInfo
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- CN103556555A CN103556555A CN201310470457.4A CN201310470457A CN103556555A CN 103556555 A CN103556555 A CN 103556555A CN 201310470457 A CN201310470457 A CN 201310470457A CN 103556555 A CN103556555 A CN 103556555A
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Abstract
The invention discloses a nail-shaped bored pile compound foundation structure for reinforcing embankment soft foundation. The nail-shaped bored pile compound foundation structure comprises an embankment, a hard shell layer, a soft clay layer and a hard clay layer from top to bottom, wherein the embankment is provided with a plurality of pile holes; each pile hole penetrates through the hard shell layer, the soft clay layer and the hard clay layer from the embankment; a diameter of each pile hole at a certain depth under the embankment is larger than that of the upper part and the lower part of the pile hole. A ground level is taken as a boundary; the pile holes are equipped with medium coarse sand above the boundary and cured cement paste or cement mortar below the boundary. The invention also discloses a construction method of the nail-shaped bored pile compound foundation structure for reinforcing the embankment soft foundation. By arranging the nail-shaped bored piles in soft embankment of roads with damages and forming the compound foundation with clay among the piles, stability of subgrade is enhanced and subgrade settlement is reduced.
Description
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 nail shape 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 nail shape drilled pile composite foundation structure of soft base under the embankment that disease appears in a kind of reinforcing is provided, nail shape drilled pile is set in there is the highway soft foundation of disease, 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 nail shape drilled pile composite foundation structure of reinforcing the soft base of embankment.
Object of the present invention realizes by following technical scheme: the nail shape 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, and a stake hole starts downward certain depth diameter from embankment lower end larger than upper and lower diameter; Take ground line as line of demarcation, and line of demarcation is medium coarse sand in above stake hole, cement paste or cement mortar for solidifying in following stake hole, line of demarcation.
The diameter of described stake hole enlarged diameter section is 300-500mm, and the diameter of stake hole reduced diameter section is 110-150mm, and the degree of depth of stake hole enlarged diameter section is 400-800mm.
After the ground of embankment is softer, uses certain hour, just can produce roadbed subsidence and pavement cracking, now can adopt job practices of the present invention to keep in repair:
A job practices for the nail shape drilled pile composite foundation structure of the soft base of 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, and scalable drill bit gets out a hole enlarged diameter section downwards, the Breadth Maximum that the diameter of stake hole enlarged diameter section is scalable drill bit, when stake hole enlarged diameter section arrives set depth H, stop scalable drill bit;
(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, is then replaced by geological drill bit;
(5), transfer at the bottom of hole after, hole to hardpan;
(6), when stake hole total depth is set depth L, will on geological drill bit, mention ground;
(7), by 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, mud density is low, in the process of grout injection or cement mortar, mud floating flows out embankment face;
(8), after cement paste or cement mortar are solidified, form nail-shaped 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, and set depth H is 400-800mm.
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;
(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) nail-shaped pile upper diameter is large, and stake clear spacing in nail-shaped pile top is little, is beneficial in embankment and forms soil arch, thereby be beneficial to, embankment is transferred to nail-shaped pile top, reduces the load of inter-pile soil, is beneficial to minimizing foundation settlement, improves subgrade stability;
(5) through appropriate design, stake diameter is up big and down small can meet existing embankment reinforcing requirement, and that therefore nail-shaped pile lower diameter is designed is smaller, can reduce boring expense, saves pile shaft material, and construction costs is low;
(6), 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 nail shape drilled pile composite foundation structure sectional drawing of the soft base of reinforcing embankment of the present invention.
Fig. 2 is to be scalable drill bit schematic diagram.
In figure: 1: embankment, 2: Soft Soil Layer, 3: nail-shaped pile, 4: hardpan, 5: drill rod connector, 6: anchor, 7: limiting section, 8: scalable bar, 9: bore tooth, 10: crust layer, 11: medium coarse sand.
The specific embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
The nail shape drilled pile composite foundation structure of the soft base of reinforcing embankment as shown in Figure 1, comprise embankment 1, crust layer 10, Soft Soil Layer 2 and hardpan 4 from top to bottom, 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), each hole is through to hardpan 4 from embankment 1 through crust layer 10, Soft Soil Layer 2, and a stake hole starts downward certain depth diameter from embankment 1 lower end larger than upper and lower diameter.Take ground line as line of demarcation, and line of demarcation is medium coarse sand 11 in above stake hole, in following stake hole, line of demarcation, is the cement solidifying or the cement bonded sand solidifying.
The diameter of stake hole enlarged diameter section is 450mm, and the diameter of stake hole reduced diameter section is 130mm, and the degree of depth of stake hole enlarged diameter section is 600mm.
The job practices of the nail shape 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, the sleeve pipe retaining wall that follows 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 gets out a hole enlarged diameter section downwards, the Breadth Maximum that the diameter of stake hole enlarged diameter section is scalable drill bit, when stake hole enlarged diameter section arrives set depth H(600mm), stop scalable drill bit;
(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, is then replaced by geological drill bit;
(5), transfer at the bottom of hole after, hole to hardpan;
(6), when stake hole total depth be set depth L(15.3m), will on geological drill bit, mention ground;
(7), by 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, mud density is low, in the process mud floating of grout injection or cement mortar, flows out embankment face;
(8), after cement paste or cement mortar are solidified, form nail-shaped pile 3, draw back sleeve pipe, to closely knit backfill medium coarse sand 11 in stake hole to roadbed end face.
The diameter of geological drill bit is 130mm, and the maximum gauge of scalable drill bit is 450mm, and set depth H is 600mm.
As shown in Figure 2, 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.
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 (5)
1. reinforce the nail shape 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, and a stake hole starts downward certain depth diameter from embankment lower end larger than upper and lower diameter; Take ground line as line of demarcation, and line of demarcation is medium coarse sand in above stake hole, cement paste or cement mortar for solidifying in following stake hole, line of demarcation.
2. the nail shape drilled pile composite foundation structure of the soft base of reinforcing embankment according to claim 1, it is characterized in that: the diameter of described stake hole enlarged diameter section is 300-500mm, the diameter of stake hole reduced diameter section is 110-150mm, and the degree of depth of stake hole enlarged diameter section is 400-800mm.
3. the job practices of the nail shape 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, and scalable drill bit gets out a hole enlarged diameter section downwards, the Breadth Maximum that the diameter of stake hole enlarged diameter section is scalable drill bit, when stake hole enlarged diameter section arrives set depth H, stop scalable drill bit;
(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, is then replaced by geological drill bit;
(5), transfer at the bottom of hole after, hole to hardpan;
(6), when stake hole total depth is set depth L, will on geological drill bit, mention ground;
(7), by 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, mud density is low, in the process of grout injection or cement mortar, mud floating flows out embankment face;
(8), after cement paste or cement mortar are solidified, form nail-shaped pile, draw back sleeve pipe, to closely knit backfill medium coarse sand in stake hole to roadbed end face.
4. the job practices of the nail shape drilled pile composite foundation structure of the soft base of reinforcing embankment according to claim 3, it is characterized in that: the diameter of described geological drill bit is 110-150mm, the maximum gauge of scalable drill bit is 300-500mm, and set depth H is 400-800mm.
5. the job practices of the nail shape 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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| CN201310470457.4A CN103556555B (en) | 2013-10-09 | 2013-10-09 | Reinforce the construction method of the nail shape drilled pile composite foundation structure of embankment widening |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106609490A (en) * | 2016-12-13 | 2017-05-03 | 重庆交通大学 | Pile-reinforcement material composite foundation structure and construction methods thereof |
| CN108221601A (en) * | 2018-01-16 | 2018-06-29 | 中建市政工程有限公司 | Roadbed construction method, structure and equipment for aeolian sand section |
| CN113215892A (en) * | 2021-05-26 | 2021-08-06 | 金陵科技学院 | Grouting soil arch induced pile-supported embankment |
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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 |
| KR20110041391A (en) * | 2009-10-15 | 2011-04-21 | 엄기형 | Pile structure |
| CN102926303A (en) * | 2012-11-22 | 2013-02-13 | 河海大学 | Method for reinforcing soft soil foundation settlement control pile foundation bracket of high-grade highway in use |
| CN203514142U (en) * | 2013-10-09 | 2014-04-02 | 广州市市政集团有限公司 | T-shaped drilling pile composite foundation structure for reinforcing soft ground under highway embankment |
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2013
- 2013-10-09 CN CN201310470457.4A patent/CN103556555B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| KR20110041391A (en) * | 2009-10-15 | 2011-04-21 | 엄기형 | Pile structure |
| CN102926303A (en) * | 2012-11-22 | 2013-02-13 | 河海大学 | Method for reinforcing soft soil foundation settlement control pile foundation bracket of high-grade highway in use |
| CN203514142U (en) * | 2013-10-09 | 2014-04-02 | 广州市市政集团有限公司 | T-shaped drilling pile composite foundation structure for reinforcing soft ground under highway embankment |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106609490A (en) * | 2016-12-13 | 2017-05-03 | 重庆交通大学 | Pile-reinforcement material composite foundation structure and construction methods thereof |
| CN106609490B (en) * | 2016-12-13 | 2019-04-05 | 重庆交通大学 | A kind of stake-reinforcement material composite foundation structure and its construction method |
| CN108221601A (en) * | 2018-01-16 | 2018-06-29 | 中建市政工程有限公司 | Roadbed construction method, structure and equipment for aeolian sand section |
| CN108221601B (en) * | 2018-01-16 | 2021-04-23 | 中建市政工程有限公司 | Roadbed construction method, structure and equipment for aeolian sand section |
| CN113215892A (en) * | 2021-05-26 | 2021-08-06 | 金陵科技学院 | Grouting soil arch induced pile-supported embankment |
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| CN103556555B (en) | 2016-08-31 |
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