CN110387877A - A kind of stiff composite pile construction technology - Google Patents
A kind of stiff composite pile construction technology Download PDFInfo
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- 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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- 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
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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
- E02D5/24—Prefabricated piles
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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
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- 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
- E02D5/58—Prestressed concrete piles
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
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
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.
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Cited By (5)
| 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 |
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| 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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