CN203514140U - Dumbbell-shaped drilling pile composite foundation structure for reinforcing soft ground under highway embankment - Google Patents
Dumbbell-shaped drilling pile composite foundation structure for reinforcing soft ground under highway embankment Download PDFInfo
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- CN203514140U CN203514140U CN201320624097.4U CN201320624097U CN203514140U CN 203514140 U CN203514140 U CN 203514140U CN 201320624097 U CN201320624097 U CN 201320624097U CN 203514140 U CN203514140 U CN 203514140U
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Abstract
The utility model discloses a dumbbell-shaped 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, each pile hole sequentially penetrates through the hard shell layer, the soft clay layer and the hard pan; two sections of each pile hole are large-diameter sections, the first large-diameter section starts from the lower end of an embankment and is extended downward to a certain depth, and the second large-diameter section is positioned in the hard shell layer at the lower end of each pile; 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. According to the composite foundation structure, dumbbell-shaped 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 dumb-bell shape 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 dumb-bell shape drilled pile composite foundation structure of soft base under the embankment that disease appears in a kind of reinforcing is provided, dumb-bell 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.
The purpose of this utility model realizes by following technical scheme: the dumb-bell 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, stake hole has two sections for enlarged diameter section, first enlarged diameter section starts to downward-extension certain depth from embankment lower end, and second enlarged diameter section is arranged in the hardpan of a bottom; 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 two enlarged diameter sections is 400-800mm.
The construction method of the dumb-bell shape 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, and scalable drill bit gets out first enlarged diameter section of a hole, the Breadth Maximum that the diameter of first enlarged diameter section is scalable drill bit downwards, when first enlarged diameter section arrives set depth H1, 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), on carry the geological drill bit of geological drilling rig, be replaced by scalable drill bit;
(7), at the bottom of scalable drill bit is transferred to hole after contraction, geological drilling rig presses down and rotates, by the reaction force of hardpan and the centrifugal force of scalable bit, scalable drill bit is expanded, scalable drill bit gets out second, hole enlarged diameter section downwards, and the Breadth Maximum that the diameter of second enlarged diameter section is scalable drill bit, when second enlarged diameter section arrives set depth H2, stop scalable drill bit, now stake hole total depth is set depth L;
(8), 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;
(9) 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, and mud density is low, and the mud floating in the process of grout injection or cement mortar flows out embankment face;
(10), after cement paste or cement mortar are solidified, form dumb-bell shape stake, 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 H1 is 400-800mm, and set depth H2 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 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) dumb-bell shape stake upper end diameter is large, and dumb-bell shape stake two ends stake clear spacing is little, is beneficial in embankment and forms soil arch, thereby be beneficial to, embankment is transferred to dumb-bell shape stake top, reduces the load of inter-pile soil, is beneficial to minimizing foundation settlement, improves subgrade stability;
(5) dumb-bell shape stake lower end diameter is large, makes full use of a high feature of bottom hardpan bearing capacity, is beneficial to the end load that improves stake;
(6) through appropriate design, stake diameter two ends are large, centre is little can meet existing embankment reinforcing requirement, and that therefore stake mid diameter is designed is smaller, can reduce boring expense, saving pile shaft material, and construction costs is low;
(7), 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 dumb-bell shape drilled pile composite foundation structure sectional drawing of the soft base of reinforcing embankment of the present utility model.
Fig. 2 is to be scalable drill bit schematic diagram.
In figure: 1: embankment, 2: Soft Soil Layer, 3: dumb-bell shape stake, 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 utility model is described in further detail.
The dumb-bell shape 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, stake hole has two sections for enlarged diameter section, first enlarged diameter section starts to downward-extension certain depth from embankment 1 lower end, second enlarged diameter section is arranged in the hardpan of a bottom, take ground line as line of demarcation, and line of demarcation is medium coarse sand 11 in above stake hole, cement paste or cement mortar 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 degree of depth of two enlarged diameter sections is 600mm.
The construction method of the dumb-bell 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 first enlarged diameter section of a hole, the Breadth Maximum that the diameter of first enlarged diameter section is scalable drill bit downwards, when first enlarged diameter section arrives set depth H1(721mm), 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), on carry the geological drill bit of geological drilling rig, be replaced by scalable drill bit;
(7), at the bottom of scalable drill bit is transferred to hole after contraction, geological drilling rig presses down and rotates, by the reaction force of hardpan 4 and the centrifugal force of scalable bit, scalable drill bit is expanded, scalable drill bit gets out second, hole enlarged diameter section downwards, and the Breadth Maximum that the diameter of second enlarged diameter section is scalable drill bit, when second enlarged diameter section arrives set depth H2, stop scalable drill bit, now stake hole total depth is set depth L(15.6m);
(8), 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;
(9) 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, and mud density is low, in the process mud floating of grout injection or cement mortar, flow out embankment face;
(10), after cement paste or cement mortar are solidified, form dumb-bell shape stake 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 H1 is 721mm, and set depth H2 is 500mm.
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 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 dumb-bell 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, stake hole has two sections for enlarged diameter section, first enlarged diameter section starts to downward-extension certain depth from embankment lower end, and second enlarged diameter section is arranged in the hardpan of a bottom; Take ground line as line of demarcation, and line of demarcation is medium coarse sand in above stake hole, in following stake hole, line of demarcation, is the cement solidifying or the cement bonded sand solidifying.
2. the dumb-bell 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 two enlarged diameter sections is 400-800mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320624097.4U CN203514140U (en) | 2013-10-09 | 2013-10-09 | Dumbbell-shaped drilling pile composite foundation structure for reinforcing soft ground under highway embankment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320624097.4U CN203514140U (en) | 2013-10-09 | 2013-10-09 | Dumbbell-shaped drilling pile composite foundation structure for reinforcing soft ground under highway embankment |
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| CN203514140U true CN203514140U (en) | 2014-04-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103556551A (en) * | 2013-10-09 | 2014-02-05 | 广州市市政集团有限公司 | Dumbbell-shaped bored pile composite foundation structure used for reinforcing soft foundations of embankment and construction method thereof |
| CN110195379A (en) * | 2019-05-17 | 2019-09-03 | 中铁二院工程集团有限责任公司 | Consider non-fragment orbit coarse grain salt marsh dirt road embankment structure and construction method that violent temperature influences |
| CN111691278A (en) * | 2020-07-03 | 2020-09-22 | 西安科技大学 | I-shaped pile type cement pavement repairing structure and method |
-
2013
- 2013-10-09 CN CN201320624097.4U patent/CN203514140U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103556551A (en) * | 2013-10-09 | 2014-02-05 | 广州市市政集团有限公司 | Dumbbell-shaped bored pile composite foundation structure used for reinforcing soft foundations of embankment and construction method thereof |
| CN103556551B (en) * | 2013-10-09 | 2016-03-09 | 广州市市政集团有限公司 | Reinforce the construction method of the dumb-bell shape drilled pile composite foundation structure of embankment widening |
| CN110195379A (en) * | 2019-05-17 | 2019-09-03 | 中铁二院工程集团有限责任公司 | Consider non-fragment orbit coarse grain salt marsh dirt road embankment structure and construction method that violent temperature influences |
| CN110195379B (en) * | 2019-05-17 | 2023-09-22 | 中铁二院工程集团有限责任公司 | Ballastless track coarse-grain salty soil embankment structure considering severe air temperature influence and construction method |
| CN111691278A (en) * | 2020-07-03 | 2020-09-22 | 西安科技大学 | I-shaped pile type cement pavement repairing structure and method |
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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. |
|
| 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 |