CN110387877A - A kind of stiff composite pile construction technology - Google Patents

A kind of stiff composite pile construction technology Download PDF

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Publication number
CN110387877A
CN110387877A CN201910690689.8A CN201910690689A CN110387877A CN 110387877 A CN110387877 A CN 110387877A CN 201910690689 A CN201910690689 A CN 201910690689A CN 110387877 A CN110387877 A CN 110387877A
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CN
China
Prior art keywords
pile
stake
construction technology
rigid
stiff composite
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Pending
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CN201910690689.8A
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Chinese (zh)
Inventor
蒋关云
白慧
靳成周
赵远
程德勇
张煜玺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Building And Mounting Engineering Co Ltd No12 Bureau Ministry Of Railways
China Railway 12th Bureau Group Co Ltd
China Railway 12th Bureau Group Construction and Installation Engineering Co Ltd
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Building And Mounting Engineering Co Ltd No12 Bureau Ministry Of Railways
China Railway 12th Bureau Group Co Ltd
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Application filed by Building And Mounting Engineering Co Ltd No12 Bureau Ministry Of Railways, China Railway 12th Bureau Group Co Ltd filed Critical Building And Mounting Engineering Co Ltd No12 Bureau Ministry Of Railways
Priority to CN201910690689.8A priority Critical patent/CN110387877A/en
Publication of CN110387877A publication Critical patent/CN110387877A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • E02D5/24Prefabricated piles
    • 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
    • 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
    • E02D5/58Prestressed concrete piles

Abstract

The invention discloses a kind of stiff composite pile construction technology, which can give full play to the compound action of foundation soil body and pile body be combineding with each other, and increase bearing capacity.The present invention is stirred to form cement mixing method while slip casting, is inserted into pile for prestressed pipe before cement initial set after pile, constitutes stiff composite pile, given full play to the compound action of foundation soil body and pile body.Stiff composite pile has the characteristics that construction efficiency is high, good in economic efficiency, environment influences small, meets the development model of national building trade, agrees with the theory of green building.

Description

A kind of stiff composite pile construction technology
Technical field
A kind of stiff composite pile construction technology of the present invention, belongs to Geotechnical Engineering field.
Background technique
Common engineering pile often has bored concrete pile, tubular pole etc. with pile-type in industry at present.There is the hole that collapses, contracting in cast-in-situ bored pile Neck, the blocked up equal common quality defects of sediment, and the environmental problems such as noise pollution is serious, mud contamination;Prefabricated tubular pile is also easy to produce soil compaction effect It answers, is affected to neighboring buildings, the difficulty for meeting the construction of density layer of sand is big, and pile quality is difficult to ensure.
By the optimization to existing conventional pile-type, transformation forms stiff composite pile, can give full play to foundation soil body and pile body The compound action be combineding with each other, increase bearing capacity.Formation of pile is convenient, effect without squeezing soil, and pile quality can obtain effectively Control.
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention provides a kind of stiff composite pile construction technology, which can be abundant The compound action of foundation soil body and pile body be combineding with each other is played, bearing capacity is increased.
The invention is realized by the following technical scheme:
A kind of stiff composite pile construction technology, is stirred to form cement mixing method while slip casting, after pile at the beginning of cement It is inserted into pile for prestressed pipe before solidifying, specifically includes the step of successively carrying out as follows:
Step 1: flexible pile driving construction, flexible pile uses φ 600-800 mm cement mixing method, and sky bores cement mixed weight in region For 7-9%, effective length region cement mixed weight is 13-17%;The construction technology that cement mixing method is stirred using two sprays two: stirring Stake subsidence velocity is 0.5~0.8 m/min, and sinking grouting amount is 60-80%, and it is 0.9-1.1 m/ that mixing pile stirring, which promotes speed, Min, hoisting grouting amount are 20-40%, and when stirring promotion, pressure is positive pressure in hole;Not only guarantee smoothly lower brill but also guarantee stirring Uniformly.
Step 2: rigid pile construction, rigid pile uses prestressed concrete pipe pile, and 42 m of effective length, rigid pile is soft It constructs in 6 h after the completion of property pile driving construction;
Mixing pile machine telephone-moving is constructed after next mixing pile, static pressure machine position straightening, guide pile errors of centration control 10 mm with It is interior, align piles position central point is answered when static pressure machine is in place, and start the support oil cylinder of platform, correct stake machine horizontal attitude;In stake machine Outside coverage, centered on mixing pile, it is around uniformly distributed four theodolites of setting;
Pressing pile construction is carried out continuously, and the intermediate intermittent time of same pile is less than 30 min;
When rigid pile pile extension, weldering connection is protected using two, bonding strength should be greater than prestressed-concrete pile pile strength;
Preferably, the flexible pile is constructed by deep-mixing pile driver, and sufficiently, 28 d of the stirring soil body are without lateral confinement resistance to compression for stirring Intensity is not less than 0.8 MPa.
The consolidation process range of the flexible pile stirs range much larger than drilling machine blade, and cement slurry is diffusible slurries, Natural diffuseness range is greater than stirring range.
Preferably, the cement mixing method uses 42.5 grades of ordinary portland cements, ratio of mud 0.6-1.0.Scene Cement grout relative density is detected by mud weight indicator, to control the ratio of mud, and then guarantees that cement consumption reaches design requirement. Grouting amount measures conversion with the soil mass consolidation side of every brill, and slurry flow is controlled by flowmeter.
Preferably, discovery is vertical when the flexible pile driving construction is completed not being pressed into rigid pile in 6 h, or when indentation rigid pile Degree deviation is big, extracts indentation again marches into the arena to former stake position by mixing pile machine and stirs again more than 6 h, and construction is rigid in 6 h Stake.
Preferably, prestressed concrete pipe pile stake end is provided with positioning device, and the positioning device includes cross cone Shape pile top and positioning plate, the pile top is set at the top of end, including mutually perpendicular four splinters, adjacent two splinter it Between be provided with inclined plate, the inclined plate is up big and down small surface plate;The positioning plate along prestressed concrete pipe pile axial rings around It is set to around an end, the positioning plate, which is that top is long, is greater than right-angled trapezium plate long below.
Preferably, when the rigid pile pile extension, the dedicated sealing material of 50 g, the sealing are smeared in the end face of lower section stake Material is made of in proportion epoxy resin, curing agent, and the operating time controls within 2 min, and the presetting period is no more than 6 h, eventually The solidifying time is no more than 12 h.
Preferably, the higher level of the rigid pile connects stake lower end and is provided with connection steel end plate, two connection stakes phase up and down Lian Shi, connection board connect stake top portion with junior and protect weldering welding using two.
Compared with prior art, the invention has the following beneficial effects:
The present invention forms stiff composite pile, can give full play to foundation soil body and stake by the optimization to existing conventional pile-type, transformation The compound action of body be combineding with each other increases bearing capacity.The technique is stirred shape while slip casting by design stake diameter requirement At cement mixing method, it is inserted into pile for prestressed pipe before cement initial set after pile, constitutes stiff composite pile.
Its consolidation process range of the flexible pile stirs range much larger than drilling machine blade, and cement slurry is diffusible slurries, Natural diffuseness range is greater than stirring range.
Bearing capacity of single pile can be improved in this process, and when foundation soil weakness, pile side friction is insufficient, deep by construction Layer mixing pile can consolidate the periphery soil body, pile side friction be improved, to improve bearing capacity of single pile.
This pile foundation uses soft rigid composite pile form, and flexible pile uses 700 mm cement mixing method of φ, and rigid pile is using pre- Stress tubular pole.Its major advantage is as follows:
1) bearing capacity is higher.By the stirring of cement slurry and pile body surrounding soil, the effect of reinforcing is played, improves the carrying of stake Power.
2) construction technology is different from conventional soil compaction technique (planting stake after stirring pile), substantially reduces the shadow to surrounding enviroment It rings, is suitable for the various soft layers such as weak soil, clay, silt, flour sand and decomposed rock.
3) without mud emission, Green civilization construction.
4) relative to other pile-type, pile-forming speed is fast, work efficiency is high, short time limit.Compared with traditional pile-type, reduction is constructed into This.
5) pile for prestressed pipe batch production is produced in batches, reliable in quality.
Detailed description of the invention
Fig. 1 is stiff composite pile organigram of the present invention;
Fig. 2 is prestressed concrete pipe pile stake end positioning device structural schematic diagram of the present invention;
Fig. 3 is cross taper pile top structural schematic diagram of the present invention;
Fig. 4 is 2 link slot of structure of the invention embodiment and connector structural schematic diagram;
Fig. 5 is that the higher level of 2 rigid pile of structure of the invention embodiment connects stake upper end connecting groove structure schematic diagram.
Fig. 6 is that structure of the invention embodiment 1 connects steel tip plate configurations schematic diagram.
In figure, prestressed concrete pipe pile 1, pile top 2, positioning plate 3, link slot 4, elastic sealing layer 5, connector 6 is anti-skidding Groove 7 connects steel end plate 8, splinter 21, inclined plate 22.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below, but protection scope of the present invention is not Be limited to these embodiments, it is all without departing substantially from the change of present inventive concept or equivalent substitute be included in protection scope of the present invention it It is interior.
Embodiment 1
A kind of stiff composite pile construction technology, is stirred to form cement mixing method while slip casting, after pile at the beginning of cement It is inserted into pile for prestressed pipe before solidifying, specifically includes the step of successively carrying out as follows:
Step 1: flexible pile driving construction, flexible pile uses 700 mm cement mixing method of φ, and sky bores cement mixed weight in region and is 8%, effective length region cement mixed weight is 15%;
Specific construction process: surveying setting-out → blender is in place, and → preparing cement slurry → once whitewashes and stirs sinking → the second gunite Stirring is promoted.
1) before equipment is marched into the arena, smooth scene place removes the surface layer barrier in construction area, backfills appropriate railway ballast and ram It is real, it is desirable that the load-bearing load of roadbed is subject to the heavy pile frame that can walk, when necessary can roadbed paving case.
2) stake machine is steady, carries out location observation with theodolite column to guarantee the verticality of drilling machine.
3) it is checked after the positioning of cement mixing method stake position, pile position deviation value must be less than design requirement value and start to construct.
4) cement mixing method stirs technique, and strict control speed of application and grouting amount using two sprays two.Mixing pile sinks Speed is 0.5~0.8 m/min, and sinking grouting amount is 70%, and it is 1.0 m/min, hoisting grouting amount that mixing pile stirring, which promotes speed, It is 30%, when the stirring is promoted, pressure is positive pressure in hole;It prevents from being promoted and influences periphery ground, in turn result in sedimentation.
5) mixing pile uses 42.5 grades of ordinary portland cements, the ratio of mud 0.8, and water is detected by mud weight indicator in scene Slurry liquid relative density to control the ratio of mud, and then guarantees that cement consumption reaches design requirement.Grouting amount is with the compacted soil of every brill The amount conversion of body side, slurry flow are controlled by flowmeter.The 28 d unconfined compressive strengths for stirring the soil body are not less than 0.8 MPa。
Step 2: rigid pile construction, rigid pile uses prestressed concrete pipe pile, and 42 m of effective length, rigid pile is soft It constructs in 6 h after the completion of property pile driving construction;
Specific steps are as follows:
1) after next mixing pile is constructed in mixing pile machine telephone-moving, static pressure machine positions straightening, and guide pile errors of centration is controlled in 10 mm Within, static pressure machine positions straightening, and align piles position center is answered in the control of guide pile errors of centration within 10 mm, when static pressure machine is in place Point, and start the support oil cylinder of platform, correct stake machine horizontal attitude.
2) it unloads stake and is lifted by crane by crane using two o'clock, before being moved to pile frame, single-point is lifted by crane when entering static pressure machine.
3) lifting of pile body single-point is pinioned with wirerope, moves into leveling pile machine after stake machine, stake machine adjusts centering, while in stake machine Outside coverage, centered on mixing pile, it is around uniformly distributed four theodolites of setting;Four theodolite orthogonal verticals row Cloth, mutual direction in 90 °, to control calibration verticality.
Discovery perpendicularity deviation is big when flexible pile driving construction is completed not being pressed into rigid pile in 6 h, or when indentation rigid pile, pulls out Indentation need to march into the arena to former stake position more than 6 h by mixing pile machine and stir again, and rigid pile of constructing in 6 h again out.Pressing pile construction It must be carried out continuously, and the intermediate intermittent time of same pile is no more than 30 min.
4) when rigid pile pile extension, i.e., when section stake is spliced into whole stake up and down, weldering connection is protected using two, bonding strength should be not less than Prestressed-concrete pile pile strength.
5) when the rigid pile pile extension, the dedicated sealing material of 50 g is smeared (by epoxy resin, admittedly in the end face of lower section stake Agent forms in proportion), the operating time controls within 2 min, and the presetting period is no more than 6 h, and final setting time is no more than 12 h.
Embodiment 2
A kind of stiff composite pile construction technology, is stirred to form cement mixing method while slip casting, after pile at the beginning of cement It is inserted into pile for prestressed pipe before solidifying, specifically includes the step of successively carrying out as follows:
Step 1: flexible pile driving construction, flexible pile uses 600 mm cement mixing method of φ, and sky bores cement mixed weight in region and is 7%, effective length region cement mixed weight is 13%;
Specific construction process: surveying setting-out → blender is in place, and → preparing cement slurry → once whitewashes and stirs sinking → the second gunite Stirring is promoted.
1) before equipment is marched into the arena, smooth scene place removes the surface layer barrier in construction area, backfills appropriate railway ballast and ram It is real, it is desirable that the load-bearing load of roadbed is subject to the heavy pile frame that can walk, when necessary can roadbed paving case.
2) stake machine is steady, carries out location observation with theodolite column to guarantee the verticality of drilling machine.
3) it is checked after the positioning of cement mixing method stake position, pile position deviation value must be less than design requirement value and start to construct.
4) cement mixing method stirs technique, and strict control speed of application and grouting amount using two sprays two.Mixing pile sinks Speed is 0.5m/min, and sinking grouting amount is 60%, and it is 0.9m/min that mixing pile stirring, which promotes speed, and hoisting grouting amount is 40%, When the stirring is promoted, pressure is positive pressure in hole;It prevents from being promoted and influences periphery ground, in turn result in sedimentation.
5) mixing pile uses 42.5 grades of ordinary portland cements, the ratio of mud 0.6, and water is detected by mud weight indicator in scene Slurry liquid relative density to control the ratio of mud, and then guarantees that cement consumption reaches design requirement.Grouting amount is with the compacted soil of every brill The amount conversion of body side, slurry flow are controlled by flowmeter.The 28 d unconfined compressive strengths for stirring the soil body are not less than 0.8 MPa。
Step 2: rigid pile construction, rigid pile uses prestressed concrete pipe pile, and 42 m of effective length, rigid pile is soft It constructs in 6 h after the completion of property pile driving construction;
Specific steps are as follows:
1) after next mixing pile is constructed in mixing pile machine telephone-moving, static pressure machine positions straightening, and guide pile errors of centration is controlled in 10 mm Within, static pressure machine positions straightening, and align piles position center is answered in the control of guide pile errors of centration within 10 mm, when static pressure machine is in place Point, and start the support oil cylinder of platform, correct stake machine horizontal attitude.
2) it unloads stake and is lifted by crane by crane using two o'clock, before being moved to pile frame, single-point is lifted by crane when entering static pressure machine.
3) lifting of pile body single-point is pinioned with wirerope, moves into leveling pile machine after stake machine, stake machine adjusts centering, while in stake machine Outside coverage, centered on mixing pile, it is around uniformly distributed four theodolites of setting;Four theodolite orthogonal verticals row Cloth, mutual direction in 90 °, to control calibration verticality.
Discovery perpendicularity deviation is big when flexible pile driving construction is completed not being pressed into rigid pile in 6 h, or when indentation rigid pile, pulls out Indentation need to march into the arena to former stake position more than 6 h by mixing pile machine and stir again, and rigid pile of constructing in 6 h again out.Pressing pile construction It must be carried out continuously, and the intermediate intermittent time of same pile is no more than 30 min.
4) when rigid pile pile extension, i.e., when section stake is spliced into whole stake up and down, weldering connection is protected using two, bonding strength should be not less than Prestressed-concrete pile pile strength.
5) when the rigid pile pile extension, the dedicated sealing material of 50 g is smeared (by epoxy resin, admittedly in the end face of lower section stake Agent forms in proportion), the operating time controls within 2 min, and the presetting period is no more than 6 h, and final setting time is no more than 12 h.
Embodiment 3
A kind of stiff composite pile construction technology, is stirred to form cement mixing method while slip casting, after pile at the beginning of cement It is inserted into pile for prestressed pipe before solidifying, specifically includes the step of successively carrying out as follows:
Step 1: flexible pile driving construction, flexible pile uses 800 mm cement mixing method of φ, and sky bores cement mixed weight in region and is 9%, effective length region cement mixed weight is 17%;
Specific construction process: surveying setting-out → blender is in place, and → preparing cement slurry → once whitewashes and stirs sinking → the second gunite Stirring is promoted.
1) before equipment is marched into the arena, smooth scene place removes the surface layer barrier in construction area, backfills appropriate railway ballast and ram It is real, it is desirable that the load-bearing load of roadbed is subject to the heavy pile frame that can walk, when necessary can roadbed paving case.
2) stake machine is steady, carries out location observation with theodolite column to guarantee the verticality of drilling machine.
3) it is checked after the positioning of cement mixing method stake position, pile position deviation value must be less than design requirement value and start to construct.
4) cement mixing method stirs technique, and strict control speed of application and grouting amount using two sprays two.Mixing pile sinks Speed is 0.8 m/min, and sinking grouting amount is 80%, and it is 1.1 m/min that mixing pile stirring, which promotes speed, and hoisting grouting amount is 20%, when the stirring is promoted, pressure is positive pressure in hole;It prevents from being promoted and influences periphery ground, in turn result in sedimentation.
5) mixing pile uses 42.5 grades of ordinary portland cements, the ratio of mud 1.0.Scene water is detected by mud weight indicator Slurry liquid relative density to control the ratio of mud, and then guarantees that cement consumption reaches design requirement.Grouting amount is with the compacted soil of every brill The amount conversion of body side, slurry flow are controlled by flowmeter.The 28 d unconfined compressive strengths for stirring the soil body are not less than 0.8 MPa。
Step 2: rigid pile construction, rigid pile uses prestressed concrete pipe pile, and 42 m of effective length, rigid pile is soft It constructs in 6 h after the completion of property pile driving construction;
Specific steps are as follows:
1) after next mixing pile is constructed in mixing pile machine telephone-moving, static pressure machine positions straightening, and guide pile errors of centration is controlled in 10 mm Within, static pressure machine positions straightening, and align piles position center is answered in the control of guide pile errors of centration within 10 mm, when static pressure machine is in place Point, and start the support oil cylinder of platform, correct stake machine horizontal attitude.
2) it unloads stake and is lifted by crane by crane using two o'clock, before being moved to pile frame, single-point is lifted by crane when entering static pressure machine.
3) lifting of pile body single-point is pinioned with wirerope, moves into leveling pile machine after stake machine, stake machine adjusts centering, while in stake machine Outside coverage, centered on mixing pile, it is around uniformly distributed four theodolites of setting;Four theodolite orthogonal verticals row Cloth, mutual direction in 90 °, to control calibration verticality.
Discovery perpendicularity deviation is big when flexible pile driving construction is completed not being pressed into rigid pile in 6 h, or when indentation rigid pile, pulls out Indentation need to march into the arena to former stake position more than 6 h by mixing pile machine and stir again, and rigid pile of constructing in 6 h again out.Pressing pile construction It must be carried out continuously, and the intermediate intermittent time of same pile is no more than 30 min.
4) when rigid pile pile extension, i.e., when section stake is spliced into whole stake up and down, weldering connection is protected using two, bonding strength should be not less than Prestressed-concrete pile pile strength.
5) when the rigid pile pile extension, the dedicated sealing material of 50 g is smeared (by epoxy resin, admittedly in the end face of lower section stake Agent forms in proportion), the operating time controls within 2 min, and the presetting period is no more than 6 h, and final setting time is no more than 12 h.
Constructive embodiment 1
In stiff composite pile described in embodiment 1-3,
1 end of the prestressed concrete pipe pile is provided with positioning device, and the positioning device includes cross taper pile top 2 and determines Position plate 3, the pile top 2 is set at the top of an end, including mutually perpendicular four splinters 21, is provided between the splinter 21 tiltedly Plate 22, the inclined plate 21 are up big and down small surface plate, can will decline the soil cement that pile pinnacle is opened and arrange, reduce resistance Power facilitates tubular pole and moves downward, and guarantees the verticality of tubular pole;The positioning plate 3 along 1 axial rings of prestressed concrete pipe pile around It is set to around an end, the positioning plate 3, which is that top is long, is greater than right-angled trapezium plate long below.The quantity of the positioning plate 3 is At least 4 pieces.Positioning plate can effectively avoid tubular pole lateral displacement during the pile driving process, form good verticality, give full play to strength The bearing capacity of property composite pile foundation itself.
The higher level of the rigid pile connects stake lower end and is provided with connection steel end plate 8, when two connection stakes are connected up and down, even It connects end plate 8 and connect stake top portion with junior using two guarantor's weldering welding.
Constructive embodiment 2
In the structure of constructive embodiment 1, the higher level of the prestressed concrete pipe pile 1 connects stake upper end and is provided with several connections Slot 4, the higher level connect stake lower end setting elastic sealing layer 5 and several connectors 6, the link slot 4 and the connector 6 Match, when two connection stakes are connected up and down, the length of the connector 6 is less than the depth of link slot 4, elder generation in link slot 4 Appropriate sealing epoxy resin glue is injected, then connector is intercalated in link slot 4, passes through elasticity between upper and lower two connections stake Sealant 5 realizes sealing, and the elastic sealing layer 5 is elastic rubber material.
Lateral antiskid groove 7 can also be arranged in the link slot inner wall, after the connector is intercalated in link slot 4, The pressure effect of connector is squeezed sealing epoxy resin glue, and sealing epoxy resin glue is filled in connection trench bottom and anti-skidding recessed In slot, guarantee compactness, the stability of installation.
The present invention is not limited by embodiment illustrated herein, and is to fit to and principles disclosed herein and novelty The consistent widest range of feature.

Claims (10)

1. a kind of stiff composite pile construction technology, which is characterized in that it is stirred to form cement mixing method while slip casting, It is inserted into pile for prestressed pipe before cement initial set after pile, specifically includes the step of successively carrying out as follows:
Step 1: flexible pile driving construction, flexible pile uses φ 600-800 mm cement mixing method, and sky bores cement mixed weight in region For 7-9%, effective length region cement mixed weight is 13-17%;
The construction technology that cement mixing method uses two sprays two to stir: mixing pile subsidence velocity is 0.5~0.8 m/min, and sink note Slurry amount is 60-80%, and it is 0.9-1.1 m/min that mixing pile stirring, which promotes speed, and hoisting grouting amount is 20-40%, and the stirring mentions When rising, pressure is positive pressure in hole;
Step 2: rigid pile construction, rigid pile uses prestressed concrete pipe pile, rigid pile after the completion of flexible pile driving construction 6 It constructs in h;
Mixing pile machine telephone-moving is constructed after next mixing pile, static pressure machine position straightening, guide pile errors of centration control 10 mm with It is interior, align piles position central point is answered when static pressure machine is in place, and start the support oil cylinder of platform, correct stake machine horizontal attitude;In stake machine Outside coverage, centered on mixing pile, it is around uniformly distributed four theodolites of setting;
Pressing pile construction is carried out continuously, and the intermediate intermittent time of same pile is less than 30 min;
When rigid pile pile extension, weldering connection is protected using two, bonding strength should be greater than prestressed-concrete pile pile strength.
2. a kind of stiff composite pile construction technology according to claim 1, which is characterized in that 28 d of the stirring soil body Unconfined compressive strength is not less than 0.8 MPa.
3. a kind of stiff composite pile construction technology according to claim 1, which is characterized in that the cement mixing method is adopted With 42.5 grades of ordinary portland cements, ratio of mud 0.6-1.0.
4. a kind of stiff composite pile construction technology according to claim 1, which is characterized in that the flexibility pile driving construction is completed Discovery perpendicularity deviation is big when not being pressed into rigid pile in 6 h, or when indentation rigid pile, extracts indentation again more than 6 h, by Mixing pile machine is marched into the arena to former stake position and is stirred again, and rigid pile of constructing in 6 h.
5. a kind of stiff composite pile construction technology according to claim 1, which is characterized in that the prestressed concrete pipe Stake stake end is provided with positioning device, and the positioning device includes cross taper pile top and positioning plate, and the pile top is set to an end Top, including mutually perpendicular four splinters, inclined plate is provided between adjacent two splinter, and the inclined plate is up big and down small Surface plate;For the positioning plate along prestressed concrete pipe pile axial rings around being set to around an end, the positioning plate is upper side length Greater than the right-angled trapezium plate of lower side length.
6. a kind of stiff composite pile construction technology according to claim 1, which is characterized in that when the rigid pile pile extension, Sealing material is smeared in the end face of lower section stake, the operating time controls within 2 min, and the presetting period is no more than 6 h, final setting time No more than 12 h.
7. a kind of stiff composite pile construction technology according to claim 6, which is characterized in that the sealing material includes ring Oxygen resin and curing agent.
8. a kind of stiff composite pile construction technology according to claim 1, which is characterized in that the upper cascade of the rigid pile Pile extension lower end is provided with connection steel end plate, and when two connection stakes are connected up and down, connection board connect the use of stake top portion with junior Two protect weldering welding.
9. a kind of stiff composite pile construction technology according to claim 1, which is characterized in that at the consolidation of the flexible pile Range is managed, greater than the stirring range of drilling machine blade.
10. a kind of stiff composite pile construction technology according to claim 1, which is characterized in that cement slurry used in slip casting is Diffusible slurries, natural diffuseness range are greater than the stirring range of drilling machine blade.
CN201910690689.8A 2019-07-29 2019-07-29 A kind of stiff composite pile construction technology Pending CN110387877A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110805037A (en) * 2019-11-11 2020-02-18 宝山钢铁股份有限公司 One-time pile sinking construction method for precast tubular pile
CN110847165A (en) * 2019-11-29 2020-02-28 河海大学 Construction method of spiral anchor core-inserting cement mixing pile
CN111058457A (en) * 2019-12-13 2020-04-24 中冶天工集团有限公司 Composite stirring pile with prefabricated reinforced concrete pipe pile inserted inside and construction method
CN112726582A (en) * 2021-01-08 2021-04-30 中国建筑第二工程局有限公司 PHC cement soil mixing composite pile construction process
CN113026732A (en) * 2021-03-01 2021-06-25 中部城市建设有限公司 Construction process of stiff composite pile

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CN106894422A (en) * 2017-02-28 2017-06-27 南通华荣建设集团有限公司 Complex environment deep foundation pit supporting construction method
CN208563295U (en) * 2018-02-09 2019-03-01 广东中灏勘察设计咨询有限公司 A kind of stiff composite pile handling soft layer ground
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CN110805037A (en) * 2019-11-11 2020-02-18 宝山钢铁股份有限公司 One-time pile sinking construction method for precast tubular pile
CN110847165A (en) * 2019-11-29 2020-02-28 河海大学 Construction method of spiral anchor core-inserting cement mixing pile
CN111058457A (en) * 2019-12-13 2020-04-24 中冶天工集团有限公司 Composite stirring pile with prefabricated reinforced concrete pipe pile inserted inside and construction method
CN112726582A (en) * 2021-01-08 2021-04-30 中国建筑第二工程局有限公司 PHC cement soil mixing composite pile construction process
CN113026732A (en) * 2021-03-01 2021-06-25 中部城市建设有限公司 Construction process of stiff composite pile

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