CN103556555B - Reinforce the construction method of the nail shape drilled pile composite foundation structure of embankment widening - Google Patents
Reinforce the construction method of the nail shape drilled pile composite foundation structure of embankment widening Download PDFInfo
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- CN103556555B CN103556555B CN201310470457.4A CN201310470457A CN103556555B CN 103556555 B CN103556555 B CN 103556555B CN 201310470457 A CN201310470457 A CN 201310470457A CN 103556555 B CN103556555 B CN 103556555B
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Abstract
The invention discloses a kind of nail shape drilled pile composite foundation structure reinforcing embankment widening, including embankment from top to bottom, crust layer, Soft Soil Layer and hard stratum, described embankment has some stake holes, each stake holes is through to hard stratum from embankment through crust layer, Soft Soil Layer, and it is bigger than upper and lower diameter that stake holes starts downward certain depth diameter from embankment lower end.With ground level as line of demarcation, it is medium coarse sand in the above stake holes in line of demarcation, for cement mortar or the cement mortar of solidification in the following stake holes in line of demarcation.The invention also discloses the construction method of the nail shape drilled pile composite foundation structure reinforcing embankment widening.The present invention arranges nail shape drilled pile, and inter-pile soil form compound foundation in the highway soft foundation occur disease, thus strengthens subgrade stability, reduces subgrade settlement.
Description
Technical field
The present invention relates to occur treatment of soft foundation skill under the existing highway embankment of the diseases such as excessive sedimentation or crack
Art, is specifically related to the construction method of a kind of nail shape drilled pile composite foundation structure reinforcing embankment widening.
Background technology
Due to reasons such as differential settlement, subgrade stability differences, the highway on Soft Clay Foundation is open to traffic the way of escape
The phenomenon of face cracking is the most universal.For ensureing driving quality, need the weak soil ground under existing highway embankment
Base is reinforced.Use CFG stake, pile tube, cement mixing method the biggest to roadbed pavement destruction, it is impossible to adopt
With；For reducing the destruction to subgrade and pavement, slip casting, high-pressure rotary jet grouting pile etc. is generally used to reinforce.Work
Journey practice have shown that, in Soft Clay Foundation, slip casting belongs to fracture grouting, and either injecting grout through steel perforated pipe is still
Sleeve valve barrel grouting, is all difficult to form pile body, and consolidation effect is difficult to ensure that, and soil compaction effect is notable.High pressure
During jet grouting pile construction, expulsion pressure is up to more than 25MPa, very serious to foundation soil disturbance, frequently results in
Crack and displacement, and it is big to return slurry amount, easily pollutes road surface.
Summary of the invention
The deficiency that the present invention exists to overcome above prior art, it is provided that disease occurs in a kind of reinforcing
Under embankment, is there is the highway soft foundation of disease in the construction method of the nail shape drilled pile composite foundation structure of soft base
In nail shape drilled pile is set so that it is with inter-pile soil form compound foundation, thus strengthen subgrade stability, subtract
Few subgrade settlement.
The purpose of the present invention is realized by following technical scheme: a kind of nail shape reinforcing embankment widening is holed
The construction method of pile composite foundation structure, the structure of nail shape drilled pile composite foundation includes road from top to bottom
Dike, crust layer, Soft Soil Layer and hard stratum, described embankment has some stake holes, and each stake holes is worn from embankment
Cross crust layer, Soft Soil Layer is through to hard stratum, and described nail shape drilled pile starts downward one from embankment lower end
Determine depth diameter bigger than upper and lower bore dia；With ground level as line of demarcation, thick in the above stake holes in line of demarcation being
Sand, for cement mortar or the cement mortar of solidification in the following stake holes in line of demarcation, described nail shape boring enlarged diameter section
A diameter of 300-500mm, a diameter of 110-150mm of stake holes reduced diameter section, stake holes enlarged diameter section
The degree of depth is 400-800mm；Its construction method comprises the following steps:
(1), the embankment of existing disease, follow-up set after geological drill bit are got out under the geological drill bit of geological drilling rig
Managing and protecting wall, after drilling embankment, geological drill bit stops；
(2), on carry the geological drill bit of geological drilling rig, be replaced by scalable drill bit；
(3), scalable drill bit transfer to after shrinking at the bottom of hole, fill in stake holes design density mud
Carry out pressing under retaining wall, geological drilling rig and rotating, by reaction force and the scalable bit of crust layer
Centrifugal force, scalable drill bit is expanded, scalable drill bit gets out downwards stake holes enlarged diameter section, stake holes
The Breadth Maximum of a diameter of scalable drill bit of enlarged diameter section, when stake holes enlarged diameter section arrives set depth H,
Stop scalable drill bit；
(4), on carry scalable drill bit, scalable drill bit is in deadweight and the constraint of top stake holes reduced diameter section
Shrink under power effect, ground will be mentioned on scalable drill bit, be then replaced by geological drill bit；
(5), transfer at the bottom of hole after, boring to hard stratum；
(6), when stake holes total depth is set depth L, ground will be mentioned on geological drill bit；
(7), Grouting Pipe is inserted at the bottom of hole, utilize Grouting Pipe grout injection from bottom to top or cement mortar
Until the height set, mud density is low, and during grout injection or cement mortar, mud floats
Flow out embankment face；
(8), after cement mortar or cement mortar solidify, form nail-shaped pile, draw back sleeve pipe, close in stake holes
Real backfill medium coarse sand is to roadbed end face.
The present invention reinforces the construction method of the nail shape drilled pile composite foundation structure of embankment widening, and its feature is also
It is:
A diameter of 110-150mm of described geological drill bit, the maximum gauge of scalable drill bit is
300-500mm, set depth H are 400-800mm.
Described scalable drill bit includes that drill rod connector, 4 anchors and 4 scalable bars, 4 scalable bars lead to
Cross 4 anchors to be hinged, form parallelogram sturcutre, be positioned at anchor topmost and be arranged on drilling rod
On connector, 2 the scalable bars in lower section brill tooth is arranged below, drill rod connector be provided with restriction scalable bar beat
The limiting section of angle of release degree.
The present invention has the advantage that relative to prior art
(1) soft base under construction method of the present invention is applicable to occur the embankment of the diseases such as excessive sedimentation or crack
Reinforce, utilize geological drilling rig, scalable drill bit in the Pile Driving in Soft Soil hole of the embankment that disease occurs,
Bore diameter in embankment, road surface is 110-150mm, little to roadbed pavement destruction；
(2) sleeve pipe follow-up step is used to carry out retaining wall in embankment during boring, it is to avoid the immersion to embankment soil；
(3) stake holes uses drilling tool to return drilled as holes, relatively high pressure rotary churning pile utilize the die-cut pore-forming of high-pressure fluid and
Speech, the drilling diameter of the present invention is easier to ensure that, ground is not had soil compaction effect；
(4) nail-shaped pile upper diameter is big, and stake clear spacing in nail-shaped pile top is little, beneficially forms soil arch in embankment,
Thus it is beneficial to transfer to embankment nail-shaped pile top, reduce the load of inter-pile soil, be beneficial to reduce ground and sink
Fall, raising subgrade stability；
(5) through appropriate design, stake diameter is up big and down small can meet existing embankment reinforcement criteria, therefore
It is smaller that nail-shaped pile lower diameter designs, it is possible to reduces boring expense, saves pile shaft material, and engineering is made
Valency is low；
(6), in boring procedure, the boring of embankment part uses sleeve pipe follow-up step retaining wall, Foundation Part boring to adopt
The mud filling design density in being used in stake holes carries out retaining wall, it is to avoid collapse hole or shrinkage cavity.
Accompanying drawing explanation
Fig. 1 is the nail shape drilled pile composite foundation structure profile reinforcing embankment widening of the present invention.
Fig. 2 is for scalable drill bit schematic diagram.
In figure: 1: embankment, 2: Soft Soil Layer, 3: nail-shaped pile, 4: hard stratum, 5: drill rod connector,
6: anchor, 7: limiting section, 8: scalable bar, 9: bore tooth, 10: crust layer, 11: medium coarse sand.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
The nail shape drilled pile composite foundation structure reinforcing embankment widening as shown in Figure 1, including from top to bottom
Embankment 1, crust layer 10, Soft Soil Layer 2 and hard stratum 4, embankment 1 has some stake holes (horizontal stroke of stake holes
Determining according to different embankments to number, longitudinal number of stake holes determines according to length disease embankment occur,
Spacing between stake holes determines according to the stressing conditions of ground), each nail shape boring stake holes passes from embankment 1
Crust layer 10, Soft Soil Layer 2 are through to hard stratum 4, and nail shape drilled pile starts downward from embankment 1 lower end
Certain depth diameter is bigger than upper and lower bore dia.With ground level as line of demarcation, in the above stake holes in line of demarcation being
Coarse sand 11, for cement or the cement bonded sand of solidification of solidification in the following stake holes in line of demarcation.
A diameter of 450mm of stake holes enlarged diameter section, a diameter of 130mm of stake holes reduced diameter section, stake holes is big
The degree of depth of diameter segment is 600mm.
The present invention reinforces the construction method of the nail shape drilled pile composite foundation structure of embankment widening, including following
Step:
(1), the embankment 1 of existing disease, follow-up set after geological drill bit are got out under the geological drill bit of geological drilling rig
Managing and protecting wall, after drilling embankment 1, geological drill bit stops；
(2), on carry the geological drill bit of geological drilling rig, be replaced by scalable drill bit；
(3), scalable drill bit transfer to after shrinking at the bottom of hole, fill in stake holes design density mud
Carrying out pressing under retaining wall, geological drilling rig and rotating, reaction force and scalable drill bit by crust layer 10 revolve
The centrifugal force turned, expands scalable drill bit, and scalable drill bit gets out downwards stake holes enlarged diameter section, stake
The Breadth Maximum of a diameter of scalable drill bit of hole enlarged diameter section, when stake holes enlarged diameter section arrives set depth H
(600mm), scalable drill bit is stopped；
(4), on carry scalable drill bit, scalable drill bit is in deadweight and the constraint of top stake holes reduced diameter section
Shrink under power effect, ground will be mentioned on scalable drill bit, be then replaced by geological drill bit；
(5), transfer at the bottom of hole after, boring to hard stratum；
(6), when stake holes total depth is set depth L (15.3m), ground will be mentioned on geological drill bit；
(7), Grouting Pipe is inserted at the bottom of hole, utilize Grouting Pipe grout injection from bottom to top or cement mortar
Until the height set, mud density is low, and the process mud in grout injection or cement mortar floats and flows
Go out embankment face；
(8), after cement mortar or cement mortar solidify, form nail-shaped pile 3, draw back sleeve pipe, close in stake holes
Real backfill medium coarse sand 11 to roadbed end face.
A diameter of 130mm of geological drill bit, the maximum gauge of scalable drill bit is 450mm, set depth
H is 600mm.
As in figure 2 it is shown, scalable drill bit includes 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, are positioned at topmost
Anchor 6 is arranged on drill rod connector 5, and tooth 9 is bored in being arranged below of the scalable bar 8 in 2, lower section, and drilling rod is even
Joint 5 is provided with the limiting section 7 limiting scalable bar 8 open angle.
Above-mentioned detailed description of the invention is the preferred embodiments of the present invention, can not limit the invention,
Other any change made without departing from technical scheme or the substitute mode of other equivalence,
Within being included in protection scope of the present invention.
Claims (3)
1. reinforce a construction method for the nail shape drilled pile composite foundation structure of embankment widening, nail
The structure of shape drilled pile composite foundation includes embankment from top to bottom, crust layer, Soft Soil Layer and hard
Soil layer, described embankment has some stake holes, and each stake holes passes crust layer, Soft Soil Layer from embankment
Being through to hard stratum, described nail shape drilled pile starts downward certain depth diameter from embankment lower end
Bigger than upper and lower bore dia；With ground level as line of demarcation, it is medium coarse sand in the above stake holes in line of demarcation,
For cement mortar or the cement mortar of solidification in the following stake holes in line of demarcation, described nail shape boring major diameter
A diameter of 300-500mm of section, a diameter of 110-150mm of stake holes reduced diameter section, stake holes is big
The degree of depth of diameter segment is 400-800mm；Its construction method is characterised by: comprise the following steps:
(1), the embankment of existing disease is got out under the geological drill bit of geological drilling rig, after geological drill bit
Follow-up sleeve pipe retaining wall, after drilling embankment, geological drill bit stops；
(2), on carry the geological drill bit of geological drilling rig, be replaced by scalable drill bit；
(3), scalable drill bit transfer to after shrinking at the bottom of hole, in stake holes, fill design density
Mud carry out pressing under retaining wall, geological drilling rig and rotating, by the reaction force of crust layer and can
The centrifugal force of scalable bit, expands scalable drill bit, and scalable drill bit gets out downwards
Stake holes enlarged diameter section, the Breadth Maximum of a diameter of scalable drill bit of stake holes enlarged diameter section, work as stake
Hole enlarged diameter section arrives set depth H, stops scalable drill bit；
(4), on carry scalable drill bit, scalable drill bit deadweight and top stake holes reduced diameter section
Restraining force effect under shrink, ground will be mentioned on scalable drill bit, be then replaced by geology bore
Head；
(5), transfer at the bottom of hole after, boring to hard stratum；
(6), when stake holes total depth is set depth L, ground will be mentioned on geological drill bit；
(7), Grouting Pipe is inserted at the bottom of hole, utilize Grouting Pipe grout injection from bottom to top or water
Cement mortar is until the height of setting, and mud density is low, in grout injection or the mistake of cement mortar
In journey, mud floats and flows out embankment face；
(8), after cement mortar or cement mortar solidify, form nail-shaped pile, draw back sleeve pipe, to stake
In hole, closely knit backfill medium coarse sand is to roadbed end face.
The nail shape drilled pile composite foundation knot of reinforcing embankment widening the most according to claim 1
The construction method of structure, it is characterised in that: a diameter of 110-150mm of described geological drill bit, can
The maximum gauge of scalable drill bit is 300-500mm, and set depth H is 400-800mm.
The nail shape drilled pile composite foundation knot of reinforcing embankment widening the most according to claim 2
The construction method of structure, it is characterised in that: described scalable drill bit includes drill rod connector, 4 hinges
Nail and 4 scalable bars, 4 scalable bars are hinged by 4 anchors, form parallelogram
Structure, is positioned at anchor topmost and is arranged on drill rod connector, under the scalable bar in 2, lower section
Face is provided with brill tooth, and drill rod connector is provided with the limiting section limiting scalable bar open angle.
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| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN103556555A CN103556555A (en) | 2014-02-05 |
| CN103556555B true CN103556555B (en) | 2016-08-31 |
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| 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 |
| 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 |
| CN113215892B (en) * | 2021-05-26 | 2022-11-08 | 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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