CN107386276A - A kind of construction method of soft layer super-long and large-diameter bored piles - Google Patents
A kind of construction method of soft layer super-long and large-diameter bored piles Download PDFInfo
- Publication number
- CN107386276A CN107386276A CN201710596166.8A CN201710596166A CN107386276A CN 107386276 A CN107386276 A CN 107386276A CN 201710596166 A CN201710596166 A CN 201710596166A CN 107386276 A CN107386276 A CN 107386276A
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- China
- Prior art keywords
- overlength
- mud
- soft layer
- long
- construction method
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
Abstract
The invention discloses a kind of construction method of soft layer super-long and large-diameter bored piles, comprise the following steps：S1, smooth location, pad fills out supporting course on soft layer so that construction equipment can travel on supporting course；S2, the position for setting bored concrete pile；S3, in the bored concrete pile position of setting bury overlength steel pile casting；S4, digging machine is applied to Soft Soil Layer excavation pore-forming to hard rock stratum, using slow brill, carry slowly, each drilling depth control is within 500mm, and when carrying drilling rod every time, mud liquid level necessarily exceedes original ground absolute altitude, and overlength casing upper surface must not be higher than, ensure that mud is sufficient so that the enough soil body principle of balance pressure of mud pressure in overlength casing.S5, rush stake machine fill orifice is stamped and formed out to hard rock stratum；S6, steel reinforcement cage is installed in fill orifice；S7, toward concrete perfusion in fill orifice；S8, overlength steel pile casting is extracted before concrete initial set.
Description
Technical field
The invention belongs to the technical field of construction of bored concrete pile, and in particular to a kind of soft layer super-long and large-diameter bored piles
Construction method.
Background technology
The construction of stake is irrigated in soft layer drilling, it is necessary to pad that the soil thickness filled out is big, and construction cost is high, it is easy to
Cause landslide, constructional difficulties, many potential safety hazards be present.On the one hand because using mud off and the underwater slip casting of Grouting Pipe, lead
Cause pit protection mud cake and pile bottom sediment serious, cause pouring pile bearing capacity to decline, and arranged outside mud and be easily caused environmental pollution；Weak soil
Because soil mass property is poor in layer, not only pile body perpendicularity is difficult to ensure, and collapse hole phenomenon is very universal in pore forming process.Consider
It is distributed more widely to coastal area soft layer, existing concrete cast-in-place pile construction method be difficult to be applicable, it is necessary to from construction technology and
From the aspect of engineering cost two, new ultra-long concrete cast-in-place pile construction method is explored.
The content of the invention
Above-mentioned soft layer drilling construction is difficult, construction cost is high, the technology of construction period length is asked in order to solve by the present invention
Topic, there is provided a kind of working security is high, the construction method of cost-effective soft layer super-long and large-diameter bored piles.
In order to solve the above problems, what the present invention was achieved by following technical scheme：
The construction method of soft layer super-long and large-diameter bored piles of the present invention, comprises the following steps：
S1, smooth location, pad fills out supporting course on soft layer so that construction equipment can travel on supporting course；
S2, the position for setting bored concrete pile；
S3, in the bored concrete pile position of setting bury overlength steel pile casting；
S4, digging machine is applied to Soft Soil Layer excavation pore-forming to hard rock stratum, using slow brill, carry slowly, each drilling depth control is in 500mm
Within, and when carrying drilling rod every time, mud liquid level necessarily exceedes original ground absolute altitude, and must not be higher than overlength casing upper end
Face, ensure that mud is sufficient so that the enough soil body principle of balance pressure of mud pressure in overlength casing.
S5, rush stake machine fill orifice is stamped and formed out to hard rock stratum；
S6, steel reinforcement cage is installed in fill orifice；
S7, toward concrete perfusion in fill orifice；
S8, overlength steel pile casting is extracted before concrete initial set.
Further, in the step S1, the supporting course is the brick dregs layer that pad is filled out.
Further, need to check the position of bored concrete pile in the step S2, in the S3, needed after having buried overlength steel pile casting
The position of bored concrete pile is checked again and marks the height of the overlength steel pile casting.
Further, in the step S7, during using rushing stake machine concrete perfusion, each pipe laying depth is not to be exceeded 6 meters,
And concrete hopper is promoted all to extract concrete surface every time.
Further, after step S5, before step S6, in addition to step：First time borehole cleaning, it will be filled using sand separator
The fine sand in mud in orifice is separated so that the fine content in mud is less than 8%.
Further, after step S6, before step S7, in addition to the second borehole cleaning, using sand separator by fill orifice
The fine sand of mud separate so that the fine content in mud is less than 8%, and mud viscosity is less than 28 seconds, and mud balance should
Control is between 1.1~1.3.
Further, in the step S2, bored concrete pile position is determined, according to the diameter of overlength casing, with bored concrete pile
Mandrel is crosspoint, is radiated to surrounding and draws cross hairs to the outer radial position of overlength casing.
Further, the diameter of the overlength steel pile casting is bigger 0.1m-0.2m than construction stake footpath, the wall of the overlength steel pile casting
Thickness is more than 8mm, and the length of the overlength steel pile casting is 12m-15m.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention combines construction technology of spinning using overlength steel pile casting construction large-section in-situ concrete pile, it is possible to reduce place pad is filled out
Thickness, while it also avoid risk of caving in, also reduce as caused by collapse hole concrete increase, it is greatly cost-effective.Solution
Bored concrete pile orifice position concrete is constructed into horn-like situation in weak soil stratum of having determined.Due to being constructed using long casing, field
As long as ground cushion is filled out meets that concrete placement vehicle is walked substantially, big machinery construction is directly constructed after being filled out using metal mat, ensures machine
Safety of the tool in pore forming process.
Embodiment
The preferred embodiments of the present invention are illustrated below, it will be appreciated that preferred embodiment described herein is only used
In the description and interpretation present invention, it is not intended to limit the present invention.
The construction method of soft layer super-long and large-diameter bored piles of the present invention, comprises the following steps：
S1, smooth location, pad fills out supporting course on soft layer so that construction equipment can travel on supporting course；It is described
The brick dregs layer that supporting course is filled out for pad.
S2, the position for setting bored concrete pile, determine bored concrete pile position, according to the diameter of overlength casing, with the center of bored concrete pile
Axle is crosspoint, is radiated to surrounding and draws cross hairs to the outer radial position of overlength casing, and checks position and the design of bored concrete pile
Whether the position on drawing is consistent.
S3, in the bored concrete pile position of setting overlength steel pile casting is buried, check the position of bored concrete pile again and mark described super
The height of long steel pile casting, the diameter of the overlength steel pile casting is bigger 0.1m-0.2m than construction stake footpath, the wall thickness of the overlength steel pile casting
More than 8mm, the length of the overlength steel pile casting is 12m-15m, and the outer surface parcel at the both ends of the overlength steel pile casting, which is provided with, to be added
Strong steel plate, when ensureing vibration hammer vibrations, long steel pile casting upper end is indeformable.
S4, digging machine is applied to Soft Soil Layer excavation pore-forming to hard rock stratum, using slow brill, carry slowly, each drilling depth control is in 500mm
Within, and when carrying drilling rod every time, mud liquid level necessarily exceedes original ground absolute altitude, and must not be higher than overlength casing upper end
Face, ensure that mud is sufficient so that the enough soil body principle of balance pressure of mud pressure in overlength casing.
S5, rush stake machine fill orifice is stamped and formed out to hard rock stratum.
S6, first time borehole cleaning, the fine sand in the mud in fill orifice is separated using sand separator so that in mud
Fine content be less than 8%.
S7, steel reinforcement cage is installed in fill orifice, because stake exceeds disposable reinforcement cage hoisting deeply, scene uses and welded twice
Steel reinforcement cage method is constructed, i.e., field ground is completed to connect cage twice, meets once to sling the steel reinforcement cage within 30 meters, using two cranes
4 points of lifting technique cages, an automobile person are placed on fabrication of reinforcing cage scene, moved to after the directly lifting of a crawler crane
Pile hole site carries out lower cage.Because steel reinforcement cage cage length exceeds 48 meters, weight is more than 12 tons, and after two section docking, upper reinforcement is hung
Muscle needs to strengthen welding, and it is integrally welded to be welded on the steel pile casting buried.
S8, the second borehole cleaning, the fine sand of the mud in fill orifice is separated using sand separator so that thin in mud
Sand content is less than 8%, and mud viscosity is less than 28 seconds, and mud balance should be controlled between 1.1~1.3.
S9, toward concrete perfusion in fill orifice, during using rushing stake machine concrete perfusion, each pipe laying depth is not to be exceeded 6
Rice, and promote concrete hopper all to extract concrete surface every time.
S10, overlength steel pile casting is extracted before concrete initial set.
S11, the backfill of bored concrete pile emptying aperture.
Relation table between the specification of casing and stake footpath：
The construction method of soft layer super-long and large-diameter bored piles of the present invention, in Mud Ground by using overlength steel
The effect of bucket retaining wall is protected, top is filled out using masonry slag pad to improve the bearing capacity of soft layer subjacent bed, and reaching place can be effective
Support the squeezing action of mechanically supported power and scattered machinery to lower sleeping ultra-deep sludge soft.Reduce place pad and fill out thickness, have simultaneously
Effect saves collapsing to collapse and causing mechanical sinking for top loose fill and sludge soft.The retaining wall that bucket is protected by overlength steel acts on, and can have
The size in stake footpath in the control pore forming process of effect, reducing work progress pile foundation plinth pile quality influences, and accelerates the weak silt in top
The speed of dirt bed construction, reaches saving concrete, while ensure the purpose of pile quality.Construction technology of the present invention is easy, applies
Construction equipment is conventional, and efficiency of construction is high, and construction cost is low, remarkable in economical benefits, construction environmental protection, material is reused, to environment
Destruction is preferably minimized, and working security, stability are good, ensure that construction quality also ensure that the safety of construction.
The other structures of the construction method of soft layer super-long and large-diameter bored piles are referring to prior art described in the present embodiment.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, therefore
Every any modification that without departing from technical solution of the present invention content, the technical spirit according to the present invention is made to above example,
Equivalent variations and modification, in the range of still falling within technical solution of the present invention.
Claims (10)
- A kind of 1. construction method of soft layer super-long and large-diameter bored piles, it is characterised in that：Comprise the following steps：S1, smooth location, pad fills out supporting course on soft layer so that construction equipment can travel on supporting course；S2, the position for setting bored concrete pile；S3, in the bored concrete pile position of setting bury overlength steel pile casting；S4, apply digging machine pore-forming excavated to Soft Soil Layer to hard rock stratum, bore, carry slowly using slow, each drilling depth control 500mm with It is interior, and when carrying drilling rod every time, mud liquid level necessarily exceedes original ground absolute altitude, and must not be higher than overlength casing upper surface, Ensure that mud is sufficient so that the enough soil body principle of balance pressure of mud pressure in overlength casing.S5, rush stake machine fill orifice is stamped and formed out to hard rock stratum；S6, steel reinforcement cage is installed in fill orifice；S7, toward concrete perfusion in fill orifice；S8, overlength steel pile casting is extracted before concrete initial set.
- 2. the construction method of soft layer super-long and large-diameter bored piles according to claim 1, it is characterised in that：The step In S1, the supporting course is the brick dregs layer that pad is filled out.
- 3. the construction method of soft layer super-long and large-diameter bored piles according to claim 1, it is characterised in that：The step Need to check the position of bored concrete pile in S2, in the S3, need to check position and the mark of bored concrete pile again after having buried overlength steel pile casting Note the height of the overlength steel pile casting.
- 4. the construction method of soft layer super-long and large-diameter bored piles according to claim 3, it is characterised in that：The step In S7, during using rushing stake machine concrete perfusion, each pipe laying depth is not to be exceeded 6 meters, and promotes concrete hopper not every time Concrete surface must be extracted.
- 5. according to the construction method of any one of Claims 1-4 soft layer super-long and large-diameter bored piles, its feature exists In：After step S5, before step S6, in addition to step：First time borehole cleaning, using sand separator by the mud in fill orifice Fine sand separate so that fine content in mud is less than 8%.
- 6. the construction method of soft layer super-long and large-diameter bored piles according to claim 5, it is characterised in that：In step S6 Afterwards, before step S7, in addition to the second borehole cleaning, the fine sand of the mud in fill orifice is separated using sand separator so that Fine content in mud is less than 8%, and mud viscosity is less than 28 seconds, and mud balance should be controlled between 1.1~1.3.
- 7. the construction method of soft layer super-long and large-diameter bored piles according to claim 5, it is characterised in that：The step In S2, bored concrete pile position is determined, according to the diameter of overlength casing, using the central shaft of bored concrete pile as crosspoint, is drawn to surrounding radiation Go out cross hairs to the outer radial position of overlength casing.
- 8. the construction method of soft layer super-long and large-diameter bored piles according to claim 5, it is characterised in that：The overlength The diameter of steel pile casting is bigger 0.1m-0.2m than construction stake footpath, and the wall thickness of the overlength steel pile casting is more than 8mm, the overlength steel pile casting Length be 12m-15m.
- 9. the construction method of soft layer super-long and large-diameter bored piles according to claim 8, it is characterised in that：The overlength The outer surface parcel at the both ends of steel pile casting, which is provided with, strengthens steel plate.
- 10. according to the construction method of any one of claim 6 to the 9 soft layer super-long and large-diameter bored piles, its feature exists In：After the step S8, in addition to the backfill of bored concrete pile emptying aperture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710596166.8A CN107386276A (en) | 2017-07-20 | 2017-07-20 | A kind of construction method of soft layer super-long and large-diameter bored piles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710596166.8A CN107386276A (en) | 2017-07-20 | 2017-07-20 | A kind of construction method of soft layer super-long and large-diameter bored piles |
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| Publication Number | Publication Date |
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| CN107386276A true CN107386276A (en) | 2017-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710596166.8A Pending CN107386276A (en) | 2017-07-20 | 2017-07-20 | A kind of construction method of soft layer super-long and large-diameter bored piles |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080209A (en) * | 2019-04-20 | 2019-08-02 | 中国二十冶集团有限公司 | Cast-in-place pile construction method in deep backfill |
| CN110593254A (en) * | 2019-09-09 | 2019-12-20 | 粤水电轨道交通建设有限公司 | Construction method of cast-in-situ bored pile in stratum with karst cave in joint zone |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104153352A (en) * | 2014-07-31 | 2014-11-19 | 广西科技大学 | Karst geology rotary-drilling bored concrete pile hole forming process |
| CN105278381A (en) * | 2015-11-03 | 2016-01-27 | 北京京东世纪贸易有限公司 | Method implemented by electronic equipment, electronic equipment control device and electronic equipment |
| CN105970918A (en) * | 2016-03-23 | 2016-09-28 | 中铁四局集团钢结构有限公司 | Pile foundation hole forming construction process under large-particle-size cobble sandy soil and severe water seepage geological condition |
| CN106836206A (en) * | 2017-03-30 | 2017-06-13 | 重庆建工住宅建设有限公司 | Casing rotary digging bore forming method |
| CN106939595A (en) * | 2017-02-14 | 2017-07-11 | 中建二局第三建筑工程有限公司 | A kind of rotary digging bottom-enlarging filling pile construction technology |
-
2017
- 2017-07-20 CN CN201710596166.8A patent/CN107386276A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153352A (en) * | 2014-07-31 | 2014-11-19 | 广西科技大学 | Karst geology rotary-drilling bored concrete pile hole forming process |
| CN105278381A (en) * | 2015-11-03 | 2016-01-27 | 北京京东世纪贸易有限公司 | Method implemented by electronic equipment, electronic equipment control device and electronic equipment |
| CN105970918A (en) * | 2016-03-23 | 2016-09-28 | 中铁四局集团钢结构有限公司 | Pile foundation hole forming construction process under large-particle-size cobble sandy soil and severe water seepage geological condition |
| CN106939595A (en) * | 2017-02-14 | 2017-07-11 | 中建二局第三建筑工程有限公司 | A kind of rotary digging bottom-enlarging filling pile construction technology |
| CN106836206A (en) * | 2017-03-30 | 2017-06-13 | 重庆建工住宅建设有限公司 | Casing rotary digging bore forming method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080209A (en) * | 2019-04-20 | 2019-08-02 | 中国二十冶集团有限公司 | Cast-in-place pile construction method in deep backfill |
| CN110593254A (en) * | 2019-09-09 | 2019-12-20 | 粤水电轨道交通建设有限公司 | Construction method of cast-in-situ bored pile in stratum with karst cave in joint zone |
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Application publication date: 20171124 |