CN103741683B - A kind of pouch expands end rigid-flexible mechanical arm and construction method - Google Patents
A kind of pouch expands end rigid-flexible mechanical arm and construction method Download PDFInfo
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- CN103741683B CN103741683B CN201310716520.8A CN201310716520A CN103741683B CN 103741683 B CN103741683 B CN 103741683B CN 201310716520 A CN201310716520 A CN 201310716520A CN 103741683 B CN103741683 B CN 103741683B
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Abstract
The present invention relates to a kind of pouch and expand end rigid-flexible mechanical arm, described compound pile main body is formed by connecting by following prefabricated tubular pile from top to down respectively: TSC stake, PRC stake and PHC stake; PHC stake bottom is provided with enlarged footing at the bottom of the stake of outsourcing pouch; Be reserved with slip casting duct in each prefabricated pipe pile lining, pile section two ends are provided with perforated pipe pile joint, and bottom pile section sidewall is provided with grout outlet; Stake week cement-soil is wrapped up outside compound pile.The present invention bears the rule of horizontal loading according to pile body in the soil body, the prefabricated tubular pile that the bending resistance, the shear behavior that are connected promote gradually is implanted successively in cement-soil, and the stable pouch grouting behind shaft or drift lining enlarged footing of proterties is set, to increase pile body vertical bearing capacity, there is higher technical economic benefit.The invention also discloses the construction method of combinations thereof stake.
Description
Technical field
The present invention relates to a kind of pouch and expand end rigid-flexible mechanical arm, improve, be provided with at the bottom of stake the compound pile of high-pressure slip-casting pouch gradually in particular to a kind of bending resistance of pile body from bottom to top shear behavior, belong to field of foundation treatment, be applicable to Soft Ground engineering, be specially adapted to the building pile foundation engineering of non rock rooted pile, non-deep hard bearing stratum.
Background technology
Combination of rigidity and flexibility bearing capacity of pile foundation is provided jointly by stake and inter-pile soil, by the construction of rigid-flexible mechanical arm, realizes the ground extruding to inter-pile soil, gives full play to and utilize the potential bearing capacity of foundation soil, effectively solves the problem of load-carrying capacity of soft soil foundation deficiency.In actual condition, pile foundation is except bearing vertical load or resistance to plucking, also need to resist the horizontal force action suffered by building, and the horizontal loading that the different embedded depth of pile body is born is also different, adopt same pile-type, under the prerequisite meeting maximum load capacity requirement, the level of part pile body does not obtain best performance to bearing capacity, and definite meaning belongs to waste of material.
Prefabricated tubular pile has the advantages such as bearing capacity of single pile is high, prefabrication system easy to control the quality, speed of application are fast, as the rigid pile Be very effective of combination of rigidity and flexibility stake.Common prefabricated tubular pile has prestressed concrete pipe pile (PC pile tube), thin tubular piles produced by prestressed concrete (PTC pile tube) and PHC piles (PHC stake), PHC stake manufacturing technology is innovated, extend some novel prefabricated tubular piles, such as: outer wall adopts automatic submerged-arc spiral welded steel pipe, inwall adopts high-strength concrete, forms prefabricated high-strength concrete thin steel pipe pile (TSC stake) through centrifugal closely knit vapour pressure steam test maintenance; In prestressed concrete pipe pile, add the nonprestressed reinforcement of some, form a kind of novel hybrid reinforcement pile for prestressed pipe (PRC stake); Outside PHC stake prefabricated the prestressed concrete bamboo joint pile of branch (PHDC stake).Cited first two Novel tubular pile is compared with stake footpath PHC stake such as grade, be greatly improved in opposing horizontal loads, especially TSC stake, due to steel pipe confined effect, pile body concrete single load bearing being converted into two to accepting, improving pile body resistance to compression, shear behavior.And PHDC stake is due to the existence of the collateral dish of stake, change contact area and the mode of transfer force of pile body and pile peripheral earth, the PHC stake external diameter such as comparing has higher vertical bearing capacity.Utilize the diversity of prefabricated tubular pile, be reasonably combined and can give full play to the vertical and horizontal direction supporting capacity of pile body, to improve pile body utilization rate.
In addition, pile foundation mainly bears portion's vertical load in actual condition, for improving vertical bearing capacity, except increasing stake footpath, selecting the conventional methods such as the pile-type that load-carrying properties are higher, also can adopt expanded bore pile technology, rely on early stage pore-forming to expand the end or grouting behind shaft or drift lining is squeezed etc. that mode makes pile body base diameter be greater than top pile body diameter, effectively can improve pile top bearing capacity (i.e. Foundation pressure).But tradition bore dig counter-boring techniques can not the compaction pile side soil body, after perfusion pile, pile side friction does not effectively promote.Adopt grouting behind shaft or drift lining to expand the end, utilize the densification osmosis of high-pressure slip-casting effectively can improve the load-carrying properties of the soil body near stake end, but its reinforcing scope can not accurately control, expansion end effect is uncontrollable.
In sum, adopt combination of rigidity and flexibility stake to play and to utilize pile peripheral earth potential bearing capacity, stronger overcomes the not enough problem of bearing capacity of foundation soil; Utilize, level vertical with the different prefabricated tubular piles in stake footpath to bearing capacity difference, reasonable combination, can improve Bearing Behavior of Pile and pile body utilization rate; If bottom-grouting-enlarged scope and effect can be controlled, not only have cured a subsoil body, also can ensure expanded bore pile bearing capacity reliability.
Given this, playing the problems such as insufficient, expansion end effect is uncontrollable for solving Bearing Behavior of Pile, needing the novel combination of rigidity and flexibility stake that at the bottom of the combination of a kind of different type pile of invention, stake, pouch is bottom-grouting-enlarged at present badly.
Summary of the invention
The object of the present invention is to provide a kind of pouch to expand end rigid-flexible mechanical arm, this compound pile is formed by rear the implantation in cement-soil of stake footpath prefabricated tubular pile combination of waiting of several load-carrying properties differences, and is provided with bellows slip casting extruding expanding body at the bottom of stake.
For realizing above-mentioned technical purpose, present invention employs following technical scheme:
A kind of pouch expands end rigid-flexible mechanical arm, it is characterized in that described compound pile main body is formed by connecting by following prefabricated tubular pile from top to down respectively: TSC stake, PRC stake and PHC stake; PHC stake bottom is provided with enlarged footing at the bottom of the stake of outsourcing pouch; Be reserved with slip casting duct in each prefabricated pipe pile lining, pile section two ends are provided with perforated pipe pile joint, and bottom pile section sidewall is provided with grout outlet; Stake week cement-soil is wrapped up outside compound pile.
Described pile tube is according to bearing horizontal loading different choice different type pile in the soil body, but the external diameter of TSC stake, PRC stake and PHC stake, wall thickness are identical, adopts hoop locking hoop pile extension, and is aided with reinforcement of weld pipe pile joint, the anti-corrosion process of pile extension place.
Pouch is fixed on compound pile bottom by cuff or steel strand tie spacer, and bladder material is formed by two rubber and anti-granny rag hot rolling sulfuration, and according to the prefabricated pouch of enlarged footing design size at the bottom of pile body size and stake, tiny steam vent is reserved on pouch top.
Stake end enlarged footing is by slip casting duct in prefabricated pipe pile lining to the squeezed formation of pouch inner high voltage slip casting, and at the bottom of stake, the ratio of enlarged footing diameter and pile tube diameter is not more than 3, and is not less than 2.
Described slip casting duct is formed by pre-buried minor-diameter rigid body when making pile tube in pile lining, is provided with telescoping tube near pipe pile joint section.During pile extension, aim at joint preformed hole, insert equal diameter Grouting Pipe, regulate insertion depth by the top pressure stretch draw, make slip casting duct keep being communicated with.
The all cement-soils of stake can adopt deep layer agitation of cement method or Pressure Revolving Blast-Grout to be formed according to planting a degree of depth, and outside pile tube, cement-soil process range diameter is 1.4 ~ 2 times of pile tube diameter; Diameter and the pile tube diameter ratio of the stake end cement-soil of stake enlarged footing periphery, the end are not more than 4, and are not less than 2.
Prefabricated tubular pile other pile sections except upper joint TSC stake can replace with equal-specification prefabricated tubular pile according to engineering geological conditions, and according to PHDC stake, stake footpath refers to the external diameter of pile body non-protruding part.
Pouch expands the construction method of end rigid-flexible mechanical arm, mainly comprises the following steps:
1) prepare before construction: pile tube and pile extension component needed for designing requirement prefabrication, make pouch; Place is peaceful, machine-walking track laying, and machinery is marched into the arena;
2) flexible pile is set: form flexible pile by deep layer agitation of cement method or Pressure Revolving Blast-Grout, expand cement-soil scope at stake end position according to designing requirement;
3) PHC stake is implanted: implanting being banded with the first segment PHC stake of expanding end pouch in cement-soil, avoiding foreign matter to enter slip casting duct and causing plugging, temporary fixed after implanting certain depth, prepares pile extension;
4) pile extension be communicated with slip casting duct: rubber washer is placed at PHC pile joint injected hole road junction, and inserts Grouting Pipe, adjustment insertion depth; Hang next pipe joint stake, cleaning 2-section pipe pile joint place, latch is located, and is communicated with slip casting duct, adopts hoop locking hoop pile extension, is aided with reinforcement of weld;
5) continuous pile extension: adopt same procedure to carry out follow-up tubular pile splicing, and be communicated with slip casting duct, according to bearing horizontal loading requirement in the soil body, implants PHC stake, PRC stake and TSC stake successively;
6) slip casting in pouch: after correcting pile body height, to expansion end pouch inner high voltage slip casting, according to enlarged footing design size at the bottom of stake, injects suitable quantity of water mud;
7) constructed: complete pouch slip casting, after pile body is stable, temporary fixed facility can have been removed, carry out successive projects construction.
the present invention has following feature and beneficial effect:
1, the present invention relates to the characteristic that the PHC stake of stake footpath, PRC stake, the bending resistance of TSC stake, the shear behaviors such as compound pile make use of strengthen successively, their reasonable combination is implanted in the various soil mass degree of depth, the horizontal loading load-carrying properties of each pile body can be given full play to, improve pile body utilization rate; Upper joint adopts TSC stake, and not only because its horizontal loading drag is the highest for adopting in pile-type, and to be connected pile crown with cushion cap not fragile because of its outside steel pipe.
2, utilize deep layer agitation of cement method or Pressure Revolving Blast-Grout to make stake week cement-soil, and bottom expands, at the bottom of being conducive to, pouch slip casting is squeezed; Before cement-soil solidifies, prefabricated tubular pile substantially can be relied on to conduct oneself with dignity and implant in the soil body, form combination of rigidity and flexibility stake, soil compaction effect compares static pressure method and hammering method, and to plant stake less; Stake end pouch is sunk substantially without wearing and tearing in cement-soil.
3, built-in slip casting pipe in pile tube sidewall, is set to telescoping tube in joint, and can connect more controlled in slip casting duct when pile extension, the degree of accuracy is higher, ensures the continuity in slip casting duct, and is provided with rubber washer, prevents outside cement grout from infiltrating, causes plugging.
4, expansion end pouch is set at the bottom of stake, is provided with waveform steel plate washer at pile lining when pile tube is prefabricated, is fixed by cuff or steel strand compound rubber pad, come off when can prevent pouch from sinking with pile body, be shifted; At the bottom of pouch is shunk and to be stacked in, ambient water earth extrudes to surrounding after expanding by high-pressure slip-casting, impels cement paste penetration range to expand, and due to the parcel of pouch, enlarged footing proterties at the bottom of stake is stable.
Accompanying drawing explanation
Fig. 1 is that a kind of pouch of the present invention expands end rigid-flexible mechanical arm schematic diagram;
Fig. 2 is pile extension place of the present invention slip casting duct schematic diagram;
Fig. 3 expands end pouch to arrange schematic diagram in the present invention;
Fig. 4 is the construction process schematic diagram that a kind of pouch of the present invention expands end rigid-flexible mechanical arm;
In figure: 1-TSC stake, all cement-soils of 2-stake, 3-PRC stake, 4-PHC stake, 5-stake end cement-soil, 6-expand enlarged footing, 8-topsoil, 9-hoop locking hoop, 10-soft layer, 11-slip casting duct, 12-pipe pile joint, 13-pouch colligation joint, 14-grout outlet, the relative bearing stratum of 15-, 16-telescoping tube, 17-Grouting Pipe connector, 18-rubber washer, 19-fastening screw, 20-hoop, 21-rubber sheet gasket, 22-steel plate washer at the bottom of end pouch, 7-stake.
Detailed description of the invention
Do not state tired in the present embodiment such as all kinds of pile tube precompose transport, Soil-cement or rotary-spraying construction technology, pouch manufacture craft, Grouting Pipe link technique and grouting serous fluid proportioning, emphasis sets forth the embodiment that the present invention relates to structure.
Fig. 1 is that a kind of pouch of the present invention expands end rigid-flexible mechanical arm schematic diagram; Fig. 2 is pile extension place of the present invention slip casting duct schematic diagram; Fig. 3 expands end pouch to arrange schematic diagram in the present invention.Expand end rigid-flexible mechanical arm with reference to the pouch shown in Fig. 1 ~ 3 mainly to comprise: enlarged footing 7 at the bottom of TSC stake 1, all cement-soils 2 of stake, PRC stake 3, PHC stake 4, stake end cement-soil 5, stake.
Form cement-soil with Pressure Revolving Blast-Grout below, the compound pile of implantation external diameter 600mm, wall thickness 110mm is example, sets forth the detailed description of the invention that pouch expands end rigid-flexible mechanical arm.
All kinds of required pile tube, pile extension accessory should be made before scene goes into operation in advance, make corresponding expansion end pouch 6.Behind cleaning job site, carry out the construction line-putting, true fixed pile, pile tube, construction equipment and various types of materials are marched into the arena in time.
First high-pressure rotary-spray construction is carried out, by drilling to completion under the central point of stake position, the die-cut soil body of high-pressure rotary-spray, in relative bearing stratum 15, stake end cement-soil 5 is formed by regulating expulsion pressure, cyclone nozzle rotary speed and revolving lance lift speed, then after reducing expulsion pressure, constant churning is carried to earth's surface, as stake week cement-soil 2, remove churning device.
The PHC stake 4 being connected to expansion end pouch 6 is hung and enters in cement-soil.Expanding end pouch 6 to be tightened up by hoop 20(steel hoop or steel strand) compound rubber pad 21 is fixed on and is provided with on the pile tube sidewall of steel plate washer 22, expand end pouch 6 and squeeze air, contraction as far as possible, available geotextiles is loose to be swathed, in order to avoid sharp object scratches in cement-soil, grout outlet 14 should wrap up in scope in pouch, as far as possible near bottom.
PHC stake 4 sinks down into pile extension after certain depth.Pile body is temporary fixed, and purge tube pile joint 12, joint is placed rubber washer 18, inserts the Grouting Pipe of coupling in slip casting duct 11, presses down adjustment telescoping tube 16, makes newly to insert Grouting Pipe and be inserted in Grouting Pipe connector 17; Hang next pipe joint stake, utilize fastening screw 19 to locate, the same top pressure stretch draw 16, adjustment Grouting Pipe insertion depth, ensures that slip casting duct 11 is communicated with; Upper and lower pipe joint stake docking, dislocation deviation should not be greater than 2mm, and qualified rear employing hoop locking hoop 9 docks, and after tighting a bolt, is optionally aided with reinforcement of weld.
Adopt aforesaid way repeat pile sinking, pile extension and be communicated with slip casting duct 11, according to topsoil 8 and soft layer 10 soil mass property, connect PRC stake 3 and TSC stake 1 successively, wherein topmost pile tube must adopt TSC stake 1.After pile sinking to design elevation, rectification verticality and deviation are also overall fixing, in order to avoid follow-up high-pressure slip-casting causes pile body to be shifted.Adopt grouting pump by slip casting duct 11 to the cement grout expanding end pouch inner high voltage injection water/binder ratio 0.4 ~ 0.5, form enlarged footing 7 at the bottom of stake, grouting amount expands end pouch 6 Size calculation (for ensureing fullness degree by design, coefficient 1.2 can be multiplied by), during slip casting, in pouch, gas is discharged from pouch upper air-vent, and after slip casting completes, shutoff slip casting duct 11, prevents from returning slurry.
Pile sinking and pouch slip casting must complete before cement-soil initial set, after pouch slip casting is squeezed, continue to keep pile body to fix, until soil cement intensity reaches 80% of design strength.
Adopt Pressure Revolving Blast-Grout to carry out pouch expansion end rigid-flexible mechanical arm and plant stake, main construction course is as follows:
1) prepare before construction: pile tube and pile extension component needed for designing requirement prefabrication, make pouch; Place is peaceful, and machine-walking track laying, machinery is marched into the arena.
2) flexible pile is set: form stake week cement-soil 2 by Pressure Revolving Blast-Grout, add according to designing requirement the stake end cement-soil 5 that pressure rotary-spraying is enlarged-diameter at stake end position.
3) PHC stake is implanted: implanting in cement-soil by being banded with the first segment PHC stake 4 of expanding end pouch 6, avoiding foreign matter to enter slip casting duct 11 and causing plugging, temporary fixed after implanting certain depth, prepares pile extension.
4) pile extension be communicated with slip casting duct: on pipe pile joint 12, rubber washer 18 is placed at injected hole road junction, and inserts Grouting Pipe, adjustment insertion depth; Hang next pipe joint stake, purge tube pile joint 12, latch is located, and is communicated with slip casting duct 11, adopts hoop locking hoop 9 pile extension, is aided with reinforcement of weld.
5) continuous pile extension: adopt same procedure to carry out follow-up tubular pile splicing, and be communicated with slip casting duct 11, according to bearing horizontal loading requirement in the soil body, implants PHC stake 4, PRC stake 3 and TSC stake 1 successively.
6) slip casting in pouch: after correcting pile body height, to expansion end pouch 6 inner high voltage slip casting, according to enlarged footing at the bottom of stake 7 design size, injects suitable quantity of water mud.
7) constructed: complete pouch slip casting, after pile body is stable, temporary fixed facility can have been removed, carry out successive projects construction.
Claims (5)
1. a pouch expands end rigid-flexible mechanical arm, it is characterized in that described compound pile main body is formed by connecting by following prefabricated tubular pile from top to down respectively: TSC stake, PRC stake and PHC stake, pile body external diameter, the wall thickness of described TSC stake, PRC stake and PHC stake are identical, adopt hoop locking hoop pile extension, and be aided with reinforcement of weld pipe pile joint, the anti-corrosion process of pile extension place; PHC stake bottom is provided with enlarged footing at the bottom of the stake of outsourcing pouch; Be reserved with slip casting duct in each prefabricated pipe pile lining, pile section two ends are provided with perforated pipe pile joint, and bottom pile section sidewall is provided with grout outlet; Stake week cement-soil is wrapped up outside compound pile; The all cement-soils of described stake adopt deep layer agitation of cement method or Pressure Revolving Blast-Grout to be formed according to planting a degree of depth, and outside pile tube, cement-soil process range diameter is 1.4 ~ 2 times of pile tube diameter; Diameter and the pile tube diameter ratio of the stake end cement-soil of stake enlarged footing periphery, the end are not more than 4, and are not less than 2.
2. pouch according to claim 1 expands end rigid-flexible mechanical arm, and it is characterized in that described pouch is fixed on compound pile bottom by cuff or steel strand tie spacer, tiny steam vent is reserved on pouch top.
3. pouch according to claim 1 expands end rigid-flexible mechanical arm, it is characterized in that enlarged footing at the bottom of described stake by slip casting duct in prefabricated pipe pile lining to the squeezed formation of pouch inner high voltage slip casting, the ratio of stake end enlarged footing diameter and pile tube diameter is not more than 3, and is not less than 2.
4. pouch according to claim 1 expands end rigid-flexible mechanical arm, it is characterized in that described slip casting duct is formed in pile lining by pre-buried minor-diameter rigid body when making pile tube, being provided with telescoping tube near pipe pile joint section.
5. the construction method of a pouch expansion end rigid-flexible mechanical arm, it is characterized in that described compound pile main body is formed by connecting by following prefabricated tubular pile from top to down respectively: TSC stake, PRC stake and PHC stake, pile body external diameter, the wall thickness of described TSC stake, PRC stake and PHC stake are identical, adopt hoop locking hoop pile extension, and be aided with reinforcement of weld pipe pile joint, the anti-corrosion process of pile extension place; PHC stake bottom is provided with enlarged footing at the bottom of the stake of outsourcing pouch; Be reserved with slip casting duct in each prefabricated pipe pile lining, pile section two ends are provided with perforated pipe pile joint, and bottom pile section sidewall is provided with grout outlet; Stake week cement-soil is wrapped up outside compound pile; The all cement-soils of described stake adopt deep layer agitation of cement method or Pressure Revolving Blast-Grout to be formed according to planting a degree of depth, and outside pile tube, cement-soil process range diameter is 1.4 ~ 2 times of pile tube diameter; Diameter and the pile tube diameter ratio of the stake end cement-soil of stake enlarged footing periphery, the end are not more than 4, and are not less than 2;
Described construction method comprises the following steps:
1) prepare before construction: pile tube and pile extension component needed for designing requirement prefabrication, make pouch; Place is peaceful, machine-walking track laying, and machinery is marched into the arena;
2) flexible pile is set: form flexible pile by deep layer agitation of cement method or Pressure Revolving Blast-Grout, expand cement-soil scope at stake end position according to designing requirement;
3) PHC stake is implanted: implanting being banded with the first segment PHC stake of expanding end pouch in cement-soil, avoiding foreign matter to enter slip casting duct and causing plugging, temporary fixed after implanting certain depth, prepares pile extension;
4) pile extension be communicated with slip casting duct: on pipe pile joint, rubber washer is placed at injected hole road junction, and inserts Grouting Pipe, adjustment insertion depth; Hang next pipe joint stake, cleaning 2-section pipe pile joint place, latch is located, and is communicated with slip casting duct, adopts hoop locking hoop pile extension, is aided with reinforcement of weld;
5) continuous pile extension: adopt same procedure to carry out follow-up tubular pile splicing, and be communicated with slip casting duct, according to bearing horizontal loading requirement in the soil body, implants PHC stake, PRC stake and TSC stake successively;
6) slip casting in pouch: after correcting pile body height, to expansion end pouch inner high voltage slip casting, according to enlarged footing design size at the bottom of stake, injects suitable quantity of water mud;
7) constructed: complete pouch slip casting, after pile body is stable, temporary fixed facility can have been removed, carry out successive projects construction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310716520.8A CN103741683B (en) | 2013-12-23 | 2013-12-23 | A kind of pouch expands end rigid-flexible mechanical arm and construction method |
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| CN201310716520.8A CN103741683B (en) | 2013-12-23 | 2013-12-23 | A kind of pouch expands end rigid-flexible mechanical arm and construction method |
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| CN103741683B true CN103741683B (en) | 2015-11-18 |
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| CN113006057B (en) * | 2021-03-09 | 2023-05-23 | 山东省建筑科学研究院有限公司 | Cement soil combined pile with controllable strength and design method |
| CN113174927B (en) * | 2021-03-31 | 2023-03-24 | 山东高速岩土科技有限公司 | Reinforcement construction method of micro pile for soft soil foundation |
| CN115467322A (en) * | 2021-05-28 | 2022-12-13 | 上海同人里岩土工程技术有限公司 | Precast pile grouting after stirring and implanting into pile end and construction method thereof |
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| CN1560379A (en) * | 2003-11-21 | 2005-01-05 | 王继忠 | Constructure method of concrete pile |
| CN201310090Y (en) * | 2008-11-20 | 2009-09-16 | 国鼎(南通)管桩有限公司 | Prestressed steel pipe concrete pile |
| CN102966100A (en) * | 2012-10-25 | 2013-03-13 | 国鼎(南通)管桩有限公司 | Tensioned spun concrete (TSC) and prestressed high-strength concrete (PHC) combined pile |
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| WO2020024740A1 (en) * | 2018-08-03 | 2020-02-06 | 高永光 | Pile bottom grouting cavity and use method, and poured pile body and construction method of poured pile body |
| WO2020133992A1 (en) * | 2018-12-25 | 2020-07-02 | 高永光 | Pile-bottom grouting cavity and method for using same, and cast-in-place pile body and method for constructing same |
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| CN103741683A (en) | 2014-04-23 |
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