CN203514141U - Drilling pile composite foundation structure for reinforcing soft ground under highway embankment - Google Patents
Drilling pile composite foundation structure for reinforcing soft ground under highway embankment Download PDFInfo
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- CN203514141U CN203514141U CN201320624096.XU CN201320624096U CN203514141U CN 203514141 U CN203514141 U CN 203514141U CN 201320624096 U CN201320624096 U CN 201320624096U CN 203514141 U CN203514141 U CN 203514141U
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- embankment
- stake hole
- composite foundation
- foundation structure
- pile
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- 239000002131 composite material Substances 0.000 title claims abstract description 14
- 230000003014 reinforcing Effects 0.000 title claims abstract description 11
- 238000005553 drilling Methods 0.000 title abstract description 12
- 239000004567 concrete Substances 0.000 claims abstract description 10
- 239000004568 cement Substances 0.000 claims abstract description 9
- 239000011083 cement mortar Substances 0.000 claims abstract description 8
- 239000002689 soil Substances 0.000 claims description 20
- 239000004576 sand Substances 0.000 claims description 11
- 239000006072 paste Substances 0.000 claims description 2
- 239000004927 clay Substances 0.000 abstract description 5
- 229910052570 clay Inorganic materials 0.000 abstract description 5
- 239000011499 joint compound Substances 0.000 description 16
- 238000002347 injection Methods 0.000 description 13
- 239000007924 injection Substances 0.000 description 13
- 239000011440 grout Substances 0.000 description 12
- 201000010099 disease Diseases 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000007667 floating Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000007569 slipcasting Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The utility model discloses a drilling pile composite foundation structure for reinforcing soft ground under a highway embankment. The structure comprises an embankment, a hard shell layer, a soft clay layer and a hard pan from top to bottom, wherein a plurality of pile holes are formed in the embankment, and each pile hole sequentially penetrates through the hard shell layer, the soft clay layer and the hard pan; the diameter of each pile hole is big end down, and the large-diameter section starts from the lower end of the embankment and is extended to the bottom of each pile hole; the horizontal plane is taken as a boundary, pile holes above the boundary are filled with medium-coarse sands, while the piles below the boundary are filled with cured cement, or cement mortar or concrete. According to the composite foundation structure, drilling piles are arranged in the soft ground under the highway embankment with troubles, and form a composite foundation with earth among piles, so that the subgrade stability can reinforced, and the subgrade settlement can be reduced.
Description
Technical field
The utility model relates to soft foundation processing technology under the existing highway embankment of diseases such as occurring excessive sedimentation or crack, is specifically related to a kind of drilled pile composite foundation structure 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.
Utility model content
The deficiency that the utility model 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.
The purpose of this utility model 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 construction method 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 utility model has advantages of as follows with respect to prior art:
(1) the utility model technology 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 utility model 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 utility model.
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 utility model is described in further detail.
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 construction method 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 preferred embodiment of the present utility model; can not limit the utility model; other any change that does not deviate from the technical solution of the utility model and make or other equivalent substitute mode, within being included in protection domain of the present utility model.
Claims (2)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320624096.XU CN203514141U (en) | 2013-10-09 | 2013-10-09 | Drilling pile composite foundation structure for reinforcing soft ground under highway embankment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320624096.XU CN203514141U (en) | 2013-10-09 | 2013-10-09 | Drilling pile composite foundation structure for reinforcing soft ground under highway embankment |
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| CN203514141U true CN203514141U (en) | 2014-04-02 |
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| CN201320624096.XU Expired - Fee Related CN203514141U (en) | 2013-10-09 | 2013-10-09 | Drilling pile composite foundation structure for reinforcing soft ground under highway embankment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103556554A (en) * | 2013-10-09 | 2014-02-05 | 广州市市政集团有限公司 | Bored pile composite foundation structure used for reinforcing soft foundations of embankment and construction method thereof |
| CN104594149A (en) * | 2014-12-03 | 2015-05-06 | 中国科学院青海盐湖研究所 | Frozen soil layer road structure and construction method thereof |
-
2013
- 2013-10-09 CN CN201320624096.XU patent/CN203514141U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103556554A (en) * | 2013-10-09 | 2014-02-05 | 广州市市政集团有限公司 | Bored pile composite foundation structure used for reinforcing soft foundations of embankment and construction method thereof |
| CN103556554B (en) * | 2013-10-09 | 2016-05-11 | 广州市市政集团有限公司 | Reinforce the construction method of the drilled pile composite foundation structure of the soft base of embankment |
| CN104594149A (en) * | 2014-12-03 | 2015-05-06 | 中国科学院青海盐湖研究所 | Frozen soil layer road structure and construction method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CRCC HARBOUR + CHANNEL ENGINEERING BUREAU GROUP CO Effective date: 20140514 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20140514 Address after: 510060, Guangzhou, Guangdong province Yuexiu District Ring East Road No. 338 silver Zheng mansion 23 building Patentee after: Guangzhou Municipal Engineering Co., Ltd. Patentee after: China iron Jian Ganghangju Group Co.,Ltd Address before: 510060, Guangzhou, Guangdong province Tianhe District Ring East Road No. 338 silver Zheng mansion 23 building Patentee before: Guangzhou Municipal Engineering Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20171009 |
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| CF01 | Termination of patent right due to non-payment of annual fee |