CN106592605A - Construction method of foundation pit bracing with tri-axial stirring piles overlapped with reinforced concrete cast-in-place piles to be driven - Google Patents

Construction method of foundation pit bracing with tri-axial stirring piles overlapped with reinforced concrete cast-in-place piles to be driven Download PDF

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Publication number
CN106592605A
CN106592605A CN201710030294.6A CN201710030294A CN106592605A CN 106592605 A CN106592605 A CN 106592605A CN 201710030294 A CN201710030294 A CN 201710030294A CN 106592605 A CN106592605 A CN 106592605A
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China
Prior art keywords
pile
construction
foundation pit
reinforced concrete
construction method
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Pending
Application number
CN201710030294.6A
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Chinese (zh)
Inventor
王贵祥
徐亮
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ZHEJIANG QINYE JIANGONG GROUP CO Ltd
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ZHEJIANG QINYE JIANGONG GROUP CO Ltd
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Priority to CN201710030294.6A priority Critical patent/CN106592605A/en
Publication of CN106592605A publication Critical patent/CN106592605A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/46Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil

Abstract

The invention relates to a construction method of foundation pit bracing with tri-axial stirring piles overlapped with reinforced concrete cast-in-place piles to be driven. The method includes the following steps that (1) construction layout is conducted; (2) grooves are excavated; (3) the tri-axial stirring piles are constructed; (4) cement grout is stirred, and an air compressor is started to convey the grout to a pile driver drill; (5) the drill sprays concrete and gas and cuts soil mass to be submerged to the designed pile bottom elevation; (6) the drill sprays the concrete and gas and lifts to the designed pile top elevation; (7) a second row of stirring piles are constructed through the method with the steps (1)-(6); and (8) overlapped driving construction of cast-in-situ bored piles is performed after curing. By the adoption of the construction method, the problems that the maximum effective depth of waterproof curtains of biaxial stirring piles is insufficient and a space enclosing structure workyard is severely limited are effectively solved.

Description

A kind of three axes agitating pile set beats the construction method of construction reinforced concrete filling pile foundation pit enclosure
Technical field
The present invention relates to a kind of construction method of pile foundation pit enclosure, beats reinforced concrete more particularly, to a kind of three axes agitating pile base The construction method of poured pile base pit enclosure.
Background technology
In recent years, with the extensive application of skyscraper, in soft layer deep basal pit, building enclosure Normal practice is filling Note stake gear soil plus double two axles mixing pile sealing, but in narrow field, especially in City Building compact district building enclosure place Bored concrete pile can not be met and add double two axles mixing pile requirement.It is therefore proposed that of the invention.
The content of the invention
For the above-mentioned technical problem of prior art, it is an object of the invention to provide a kind of three axes agitating pile set beats reinforced concrete The construction method of poured pile base pit enclosure, efficiently solves two axles stirring pile water stopping curtain maximum effective depth deficiency and goes along with sb. to guard him knot The problem of structure construction site critical constraints.
To reach above-mentioned purpose, the present invention is achieved by the following technical solutions:
A kind of three axes agitating pile set beats the construction method of construction reinforced concrete filling pile foundation pit enclosure, comprises the following steps:
(1)Construction lofting;
(2)Excavate groove;
(3)Three axes agitating pile is constructed:
(3-1)The debugging in place of three axle stake machines:After three axle stake machines are in place, it is mobile before see situation in terms of up, down, left and right clearly, send out Existing barrier shuts down removing in time, and after three axle stake machine mobile ends, inspection situation is simultaneously corrected in time;
(3-2)Determine that three axle stake machines are steady, straight and even, and correction pile frame is observed with theodolite, then load onto sash weight control and hang down It is straight to spend;
(3-3)After the positioning of three axle cement mixing pile positions, then carry out positioning and check, deviation is less than 1cm;
(4)Mixing cement grout, opens air compressor machine, send slurry to drill bit of pile machine;
(5)Drill bit whitewashing, gas cutting soil sink to design stake bottom absolute altitude;
(6)Drill bit whitewashing, gas simultaneously lift design stake top absolute altitude;
(7)Using step(1)-(6)Method construction second row mixing pile;
(8)After maintenance, carry out drill-pouring pile protection and play construction.
Described step(2)Comprise the following steps:According to foundation pit enclosure inner edge control line, groove is excavated using excavator, And underground obstacle is removed, groove width is general single in 1m-1.2m, and depth is 0.8m-1m.
Three described axle cement mixing piles inject cement grout in sinking and lifting process, and whitewash subsidence velocity not More than 1m/min, lift speed and be not more than 1.5 m/min.
The amount that cement grout is injected during drilling is the 70%~80% of specified slurry amount, injects cement grout when lifting stirring Measure 20%~30% for specified slurry amount.
The ratio of mud of the cement grout be 1.5~2.0, grouting pressure be 1.5~2.5MPa, mixing pile soil body 28d resist Compressive Strength >=1.2Mpa.
Adjacent two pile driving constructions gap is less than 12h.
Concrete beginning quantity is no less than 0.8~1.3m, conduit inner concrete stake to make conduit Transducers Embedded in Concrete depth With the outer mud stake pressure balance of conduit.
Pre-hardening form removal rear enclosed immerses water curing 28d in plastic bag.
Three axes agitating pile set of the present invention beats the construction method of construction reinforced concrete filling pile foundation pit enclosure, has compared with prior art Following beneficial effect:
1st, the present invention forms water seal curtain sealing using tri-axial deep stirring pile, after deep-mixed pile reaches some strength, stands Carry out drilling pile protection and play construction, with bored concrete pile as foundation pit supporting pile, can effectively protect neighbouring existing building and buried pipe Line, reaches safe and reliable purpose.
2nd, tri-axial deep stirring pile water-stop curtain effective depth is up to 30m, and two axles stirring pile water stopping curtain is maximum effectively Depth is only 15m or so, when foundation ditch digging depth is in 10~15m, replaces two axle mixing piles, energy using tri-axial deep stirring pile The pit curtain sealing problem of effectively solving this digging depth.
3rd, three axes agitating pile set beat construction reinforced concrete filling pile can effectively solving building enclosure construction site critical constraints, sealing curtain The special measure that the normal construction size of curtain stake can not meet requirement and take.
Description of the drawings
Fig. 1 is sealing curtain pile mixing time and sinks, lifts graph of a relation;
Fig. 2 is that normal triaxial stake stirring water proof adds filling pile construction order;
Fig. 3 is that two row's three axes agitating piles set beats filling pile construction order;
Wherein, 1 for sequence of construction 1,2 for sequence of construction 2,3 for sequence of construction 3,4 for sequence of construction 4,5 for sequence of construction 5,6 is Bored concrete pile D950,7 be three axes agitating pile D850,8 be foundation ditch in, 9 be foundation ditch outside.
Specific embodiment
With reference to specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to This.
The scope of application of the present invention is as follows:
Close on and build(Structure)Thing is built, underground utilities are complicated, excavation of foundation pit depth typically in 10-15m, deepens layer using bored concrete pile supporting The construction operation width of stirring pile water stopping curtain scheme can not be met when requiring, carry out foundation pit enclosure construction using the present invention.
The operation principle of the present invention is as follows:
In the surrounding of deep-foundation pit engineering, first according to positioning datum point, quasi- trench line is put, after checking, excavate deep-mixed pile ditch Groove, after three axes agitating pile frame and stirring system are completed, carries out tri-axial deep stirring pile construction, Deep Mixing Piles Construction Row is routinely an exclusive plus bored concrete pile, can beat bored concrete pile using two rows stirring pile protection when narrow field, when every section of deep layer is stirred When mixing a pile body and reaching certain intensity, the general maintenance phase is 7d, should carry out drilled pile construction, palpus when inner support beam is constructed immediately Cut set and beat part hole inner side mixing pile, be easy to internal support of foundation pit to be directly connected to bored concrete pile, it is ensured that the safety of foundation ditch.
The step of three axes agitating pile set of the present invention beats the construction method of construction reinforced concrete filling pile foundation pit enclosure is as follows:Construction is put Sample → excavation groove → tri- axle stake machine debugging → mixing cement grout in place, opens air compressor machine, send slurry to drill bit of pile machine → drill bit Whitewashing, gas cutting soil sink to design stake bottom absolute altitude → drill bit whitewashing, gas and lift design stake top absolute altitude → same to sample prescription Method construction second row mixing pile → maintenance one week → drill-pouring pile protection plays construction.
Wherein, excavate groove to comprise the steps:
According to foundation pit enclosure inner edge control line, using 0.4m3Excavator excavates groove, and removes underground obstacle, groove width General single in 1.2m, depth is 1m.Soil process in time more than groove is excavated, to ensure deep-mixed pile normal construction, and is reached Civilized construction is required.
Three axes agitating pile construction comprises the steps:
1st, see the situation in terms of upper and lower, left and right before the movement in place of stake machine clearly, it is found that barrier should shut down removing in time.Stake machine is moved After dynamic end, conscientiously check situation and correct in time.Stake machine should be steady, straight and even.And correction pile frame is observed with theodolite, so After load onto sash weight control perpendicularity.After the positioning of three axle cement mixing pile positions, then carry out positioning and check, deviation should be less than 1cm.
2nd, mixing speed and grout injection control
(1), three axle cement mixing piles cement grout all should be injected in sinking and lifting process, while strict sinking control and carrying Lifting speed.According to design or correlation technique data regulation, whitewashing subsidence velocity is not more than 1m/min, lifts speed and is not more than 1.5m/min.During drilling, grouting amount is generally the 70%~80% of specified slurry amount, and it is specified slurry amount to lift mixing-filling amount 20%~30%, suitably continue mixing-filling in stake bottom point.The protocol of each pile is carried out, as shown in Figure 1.
(2)Prepare cement grout and serosity injection
Build at the construction field (site) and mix slurry operation platform, near platform, build bulk cement silo, serosity should be carried out before start Stir system.Using 32.5 grades of Portland cements, the ratio of mud of cement grout is controlled to 1.5~2.0 and mixes slurry and grouting amount with every Soil mass consolidation side's amount conversion of brill, grouting pressure is 1.5~2.5MPa, is controlled with serosity conveying capacity.Mixing pile soil body 28d resists Compressive Strength >=1.2Mpa.During cement-soil stirring pile construction, sinking of must not washing by water, adjacent two pile driving constructions gap must not exceed 12h.
(3)Mixing pile construction
Mixing pile construction is carried out by Fig. 2 and 3 mark orders, and row's mixing pile adopts strike-on, as shown in Figure 2;When mixing pile is two Outer mining strike-on during row, interior row not strike-on, as shown in Figure 3.In Fig. 2 and 3, dash area is bored to repeat set, it is ensured that fender body It is next by set brill is repeated that the perpendicularity of the construction quality of seriality and joint, three axle cement mixing piles and construction equipment is remedied Ensure, to reach the effect of curtain water stop.
Hole pouring pile of drilling is added using row's three axes agitating pile under general site condition, for the limited row of site condition Three axes agitating pile adds hole pouring pile planar dimension of drilling meet when requiring, using the set drilling perfusion of two row's three axes agitating piles Stake, can reduce 300mm spaces, and go along with sb. to guard him mixing pile on the inside of removable hole after excavation, can be further added by construction operation space 275mm, can save space altogether for 575mm (, with D850, cast-in-situ bored pile diameter is by taking D950 as an example for three axes agitating pile diameter);Especially Which is in depth, shallow foundation is cheated close to and place is narrow, and because certain special requirement is first constructed, then construction deep basal pit must go along with sb. to guard him knot in shallow foundation hole It is quite bigger than the space that conventional method is saved using the present invention in the case of the sealing problem of structure two sides, and be not required to additionally increase any Expense.Cast-in-situ bored pile should play construction by 7d or so sets after the completion of every section of mixing pile, can not must not delay in advance, drill-pouring Piece interval jump of of stake is beaten, for avoid it is expanding after be difficult to insertion central pile, should carry out after grout pile concrete pours 24h Middle pile driving construction.
Stake top effective depth is enclosure ring bottom elevation, and collar tie beam top mark height should be reached during perfusion, and chisel removes laitance after-pouring Collar tie beam, pile body cage bar stretch at least 500mm in collar tie beam, expanding to prevent, and should adjust mud balance, and natural mud domestic demand addition is swollen Profit soil or chemical paste, increase mud viscosity.
The present invention cement consumption of strict control and follow-up investigations per pile, stake in work progress is long, stirring-head declines It is thick with lifting speed, slurry flow, spray dropping force, the intensity into pile verticality and drilled pile, stake position, drill hole inclination, precipitation Degree and framework of steel reinforcement bottom surface elevation.Following Tables 1 and 2:
Table 1
Table 2
When there is line clogging in work progress, termination of pumping immediately is processed.Process is above carried stirring drill tool and is sunk after terminating immediately Slip casting can be continued after 1.0m, 10~20 seconds are waited and recovered to be lifted up stirring, in case broken pile occurs.Concrete beginning quantity should be able to be protected After card concrete is poured into, conduit Transducers Embedded in Concrete depth is no less than 0.8~1.3m, the stake of conduit inner concrete and the outer mud of conduit Stake pressure balance.Pre-hardening form removal rear enclosed immerses water curing 28d in plastic bag.
Tri-axial deep stirring pile is organically combined by the present invention with cast-in-situ bored pile, overcomes SMW engineering method stakes in foundation depth Aspect is by being limited, and the rigidity of reinforced concrete bored pile is big compared with H profile steel;It is important that set is played construction and solves filling The constructing operation width of note stake gear soil plus deep-mixed pile water-stop curtain scheme can not meet the specific process adopted when requiring, And building enclosure two sides sealing can be solved the problems, such as.Making for support engineering 40% has been saved compared with the support pattern of diaphram wall Valency.
Above-described embodiment is only used for the inventive concept for illustrating the present invention, rather than the restriction to rights protection of the present invention, All changes for carrying out unsubstantiality using this design to the present invention, all should fall into protection scope of the present invention.

Claims (8)

1. a kind of three axes agitating pile set beats the construction method of construction reinforced concrete filling pile foundation pit enclosure, it is characterised in that including following step Suddenly:
(1)Construction lofting;
(2)Excavate groove;
(3)Three axes agitating pile is constructed:
(3-1)The debugging in place of three axle stake machines:After three axle stake machines are in place, it is mobile before see situation in terms of up, down, left and right clearly, send out Existing barrier shuts down removing in time, and after three axle stake machine mobile ends, inspection situation is simultaneously corrected in time;
(3-2)Determine that three axle stake machines are steady, straight and even, and correction pile frame is observed with theodolite, then load onto sash weight control and hang down It is straight to spend;
(3-3)After the positioning of three axle cement mixing pile positions, then carry out positioning and check, deviation is less than 1cm;
(4)Mixing cement grout, opens air compressor machine, send slurry to drill bit of pile machine;
(5)Drill bit whitewashing, gas cutting soil sink to design stake bottom absolute altitude;
(6)Drill bit whitewashing, gas simultaneously lift design stake top absolute altitude;
(7)Using step(1)-(6)Method construction second row mixing pile;
(8)After maintenance, carry out drill-pouring pile protection and play construction.
2. three axes agitating pile set as claimed in claim 1 beats the construction method of construction reinforced concrete filling pile foundation pit enclosure, it is characterised in that Described step(2)Comprise the following steps:According to foundation pit enclosure inner edge control line, using excavator excavation groove, and with clearing Lower barrier, groove width are general single in 1m-1.2m, and depth is 0.8m-1m.
3. three axes agitating pile set as claimed in claim 1 beats the construction method of construction reinforced concrete filling pile foundation pit enclosure, it is characterised in that: Three described axle cement mixing piles inject cement grout in sinking and lifting process, and subsidence velocity of whitewashing is not more than 1m/ Min, lifts speed and is not more than 1.5 m/min.
4. three axes agitating pile set as claimed in claim 3 beats the construction method of construction reinforced concrete filling pile foundation pit enclosure, it is characterised in that: The amount that cement grout is injected during drilling is the 70%~80% of specified slurry amount, and the amount that cement grout is injected when lifting stirring is specified The 20%~30% of slurry amount.
5. three axes agitating pile set as claimed in claim 3 beats the construction method of construction reinforced concrete filling pile foundation pit enclosure, it is characterised in that: The ratio of mud of the cement grout be 1.5~2.0, grouting pressure be 1.5~2.5MPa, mixing pile soil body 28d comprcssive strength >= 1.2Mpa。
6. three axes agitating pile set as claimed in claim 3 beats the construction method of construction reinforced concrete filling pile foundation pit enclosure, it is characterised in that: Adjacent two pile driving constructions gap is less than 12h.
7. three axes agitating pile set as claimed in claim 3 beats the construction method of construction reinforced concrete filling pile foundation pit enclosure, it is characterised in that: Concrete beginning quantity is can to make conduit Transducers Embedded in Concrete depth no less than 0.8~1.3m, outside the stake of conduit inner concrete and conduit Mud stake pressure balance.
8. three axes agitating pile set as claimed in claim 7 beats the construction method of construction reinforced concrete filling pile foundation pit enclosure, it is characterised in that: Pre-hardening form removal rear enclosed immerses water curing 28d in plastic bag.
CN201710030294.6A 2017-01-17 2017-01-17 Construction method of foundation pit bracing with tri-axial stirring piles overlapped with reinforced concrete cast-in-place piles to be driven Pending CN106592605A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108343054A (en) * 2018-02-28 2018-07-31 浙江勤业建工集团有限公司 Three axes agitating pile set beats construction reinforced concrete filling pile foundation pit enclosure construction
CN108755671A (en) * 2018-05-25 2018-11-06 中铁隧道集团二处有限公司 A kind of rich water gravel layer three axes agitating pile construction method
CN109098175A (en) * 2018-08-21 2018-12-28 江苏兴厦建设工程集团有限公司 A kind of tri-axes deep mixing pile construction method
CN112575768A (en) * 2020-12-17 2021-03-30 中铁二十二局集团轨道工程有限公司 SMW construction method pile applied to subway deep foundation pit engineering
CN112609690A (en) * 2020-12-09 2021-04-06 中铁二十局集团第六工程有限公司 Construction method of rotary drilling cast-in-place pile in sea-filling geological complex area

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CN101768961A (en) * 2010-01-22 2010-07-07 中铁二十二局集团第六工程有限公司 Construction method of section-steel triaxial soil-cement mixing pile
JP2012149503A (en) * 2010-12-28 2012-08-09 Waseda Univ Soil improvement method and management method for the same
CN103669377A (en) * 2013-11-26 2014-03-26 山西四建集团有限公司 Waterproof curtain construction method
CN104032763A (en) * 2014-06-25 2014-09-10 上海市建工设计研究院有限公司 Combined-type anti-seepage waterstop curtain structure and construction method thereof
KR20150141110A (en) * 2014-08-07 2015-12-17 유한회사 지오씨엠 Method for preparing a hardening composition for deep mixing method and hardening composition for deep mixing method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101768961A (en) * 2010-01-22 2010-07-07 中铁二十二局集团第六工程有限公司 Construction method of section-steel triaxial soil-cement mixing pile
JP2012149503A (en) * 2010-12-28 2012-08-09 Waseda Univ Soil improvement method and management method for the same
CN103669377A (en) * 2013-11-26 2014-03-26 山西四建集团有限公司 Waterproof curtain construction method
CN104032763A (en) * 2014-06-25 2014-09-10 上海市建工设计研究院有限公司 Combined-type anti-seepage waterstop curtain structure and construction method thereof
KR20150141110A (en) * 2014-08-07 2015-12-17 유한회사 지오씨엠 Method for preparing a hardening composition for deep mixing method and hardening composition for deep mixing method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108343054A (en) * 2018-02-28 2018-07-31 浙江勤业建工集团有限公司 Three axes agitating pile set beats construction reinforced concrete filling pile foundation pit enclosure construction
CN108755671A (en) * 2018-05-25 2018-11-06 中铁隧道集团二处有限公司 A kind of rich water gravel layer three axes agitating pile construction method
CN109098175A (en) * 2018-08-21 2018-12-28 江苏兴厦建设工程集团有限公司 A kind of tri-axes deep mixing pile construction method
CN112609690A (en) * 2020-12-09 2021-04-06 中铁二十局集团第六工程有限公司 Construction method of rotary drilling cast-in-place pile in sea-filling geological complex area
CN112575768A (en) * 2020-12-17 2021-03-30 中铁二十二局集团轨道工程有限公司 SMW construction method pile applied to subway deep foundation pit engineering

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Application publication date: 20170426