CN104141304A - Extrusion formed precast pile stiffness core and cement soil combined Y-shaped pile and construction method thereof - Google Patents
Extrusion formed precast pile stiffness core and cement soil combined Y-shaped pile and construction method thereof Download PDFInfo
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Abstract
The invention relates to an extrusion formed precast pile stiffness core and cement soil combined Y-shaped pile. The Y-shaped pile is composed of an external cement soil cladding, a precast core pile and a precast end-open pile tip, wherein the cross section of the external cement soil cladding is Y-shaped and is formed through enclosing of a steel immersed tube in a constraint mode, the external cement soil cladding is coated with geotechnical cloth bags, and the precast core pile presses downwards perpendicularly along the center of the steel immersed tube and is embedded into a precast hollow pile tip. Back extrusion initial set type cement soil is shaped by means of the Y-shaped steel immersed tube, stability of forming of the Y-shaped pile is guaranteed, the precast core pile is inserted in the center, the advantages that the frictional resistance of the special-shaped pile side is large and the bearing capacity of the stiffness core composite pile is high are fully utilized, and technological and economical efficiency is high. The invention further discloses a construction method of the Y-shaped pile.
Description
Technical field
The present invention relates to a kind of stiff-core cement soil composite pile and construction method, particularly the Y shape stake of a kind of extrusion molding preformed pile stiff-core cement soil and construction method.Belong to ground process field, be applicable to the foundation treatment engineering of soft clay area, high-lager building.
Background technology
The requirement of carrying out foundation construction in city is more and more higher, and not only requiring has high cost performance requirement, and the environmental requirement of pile-formation process construction is also more and more higher, and existing pile-formation process mostly is castinplace pile and construction of prefabricated piles.The bearing capacity of bored pile is high, and mechanical property is also better, but bored pile cost is expensive, and the engineering time is long, and speed of application is slow, have the shortcomings such as mud outward transport contaminated environment; Tube-sinking cast-in-situ pile utilization is sunk in soil with the steel sleeve of flapper-type pile top or precast reinforced concrete pile boots, concreting in it, tube drawing pile, avoided the pile body that general bored pile pile top surface dust causes to sink, hold hypodynamic problem, but in work progress, produce larger noise, vibration can affect Adjacent Buildings, and soil compaction effect is obvious; Preformed pile has good cost performance and mechanical property, has noise pollution during bore forming, and periphery building safety and resident are caused to very big impact, although can adopt Static pressure pile driver construction, reduces construction noise, and the larger soil compaction effect of same existence; In addition, also there are the cement soil deep of employing paddling process, Pressure Revolving Blast-Grout consolidated subsoil, the solidfied materials such as cement paste form an induration with the part soil body and form composite foundation together with inter-pile soils in soil, thereby raising bearing capacity of foundation soil, less to surrounding soil disturbance, reduce the distortion of ground, but exist, bearing capacity of single pile is low, construction quality shortcoming rambunctious.
On the basis of traditional tube-sinking cast-in-situ pile, developed Y-shape bored concrete (CN 2510540Y), utilize cross section special-shaped periphery to expand principle, compare with the circular stake of same area, girth is its 1.5 times of left and right, therefore have larger pile side friction, improve pile body load-carrying properties, in soft soil foundation treatment, effect is better.Though this type has good mechanical characteristic, but because pile body subregion is relatively thin, its corrosion resistance is poor, and pile body is subject to curved rear easy generation crack, aggravation corrosion failure, in other words, described region is at pile body middle and later periods operational phase serious damage most probably, although this shaped pile still can be brought into play the effect of upper side frictional resistance, lose part supporting capacity, wasted comparatively speaking a part of pile shaft material.
Cement-soil strength core compound pile is that the novel foundation treatment technology that more high strength core stake forms composite pile is set in cement-soil, load from core stake to the soil body by the transition of cement-soil formed by force--weak progressive formation, form the rational pile body structure that the high surrounding intensity of a kind of intermediate intensity is low, given full play to the performance of core stake and cement soil pile.This type has that bearing capacity of single pile is high, construction noise is low, soil compaction effect is little, the today day by day strengthening at environmental protection consciousness, the modern construction construction environmental requirement that substantially coincide of this type.Existing a kind of core filling tubular pile cement composite foundation pile and construction method (CN 101858079 A), this type inserts pile for prestressed pipe in high-pressure rotary-spray forms cement earth pile, and fill slightly expanded concrete in pile tube upper cavity, solve the limitation of cement earth pile, each self-application of high-strength Prestressed Pipe Pile, can give full play to stake week soil side friction and a high-strength Prestressed Pipe Pile pile body structural bearing capacity that outer cement earth pile is provided simultaneously.But adopt Pressure Revolving Blast-Grout to form cement-soil and also exist certain unstability, be mainly reflected in: construction machinery creep into or rotary speed, cement paste supply rate are controlled and need be suited measures to local conditions, otherwise easily cause cement mixing content not enough or inhomogeneous, cause broken pile or shortage; The solid churning scope of bottom soil body deficiency makes a footpath deficiency, and soil mass consolidation effect declines.
In sum, ground processing form is various, tradition pile foundation form of construction work respectively has pluses and minuses, new technology application has obtained larger construction benefit, but also there is construction Difficulties and limitation separately, as: the immersed tube bored pile side friction of Y shape is large, load-carrying properties are superior, but soil compaction effect is obvious, and weakness zone cracky lost efficacy; Stiff-core cement soil composite pile bearing capacity of single pile is high, work progress environmental protection, but all cement-soil moulding of stake are uncertain, substantially rounded, and opposite side frictional resistance is less.Given this, the actual needs based on current engineering, urgently invents at present a kind of outside parcel Y shape cement-soil less stiff-core cement soil Y shape stake of soil compaction effect when improving side friction and construction that utilizes.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of pile body side friction and the less Y shape stake of extrusion molding preformed pile stiff-core cement soil and construction method of when construction soil compaction effect of improving is provided.
For realizing above-mentioned technical purpose, the present invention has adopted following technical scheme:
The stake of extrusion molding preformed pile stiff-core cement soil Y shape, comprises outsourcing cement-soil, prefabricated pile core and pre-formed members pile top; Described outsourcing cement-soil cross section is Y-shaped, is surrounded by geotextiles bag outward, by steel immersed tube, encloses restriction molding; Described prefabricated pile core is positioned at steel immersed tube central axis position, and its lower end embeds in pre-formed members pile top.
As preferably: described prefabricated pile core adopts steel concrete solid pile, pile for prestressed pipe or steel pipe pile, pile tube bottom is provided with a underseal closing plate.
As preferably: described pre-formed members pile top main body is Y-shaped, pile top top is provided with steel immersed tube limiting stand, the duct of perforation is left at pile top middle part, upper and lower part, duct is uncovered is horn-like, the uncovered diameter in bottom is less than cement mixing pile diameter 10～30mm, and open topped diameter is greater than prefabricated pile core diameter 20～50mm.
As preferably: described steel immersed tube cross section is Y shape, and amass as outsourcing cement-soil sectional area and prefabricated pile core cross section sum steel immersed tube design section.
As preferably: described geotechnological cloth bag adopts and spins geotextiles and make, and bottom is connected with pre-formed members pile top.
A construction method for extrusion molding preformed pile stiff-core cement soil Y shape stake, mainly comprises the following steps:
1) before construction, prepare: peaceful place, construction machinery, prefabricated pile core are marched into the arena in time, the members such as pre-manufactured steel immersed tube, opening pile toe and geotechnological cloth bag;
2) construction equipment combination: geotechnological cloth bag is penetrated in steel immersed tube, and geotechnological cloth bag first and last end sack turnup tapping immersed tube, guarantees that bag opens, and steel immersed tube one end is connected with the limiting stand in pre-formed members pile top;
3) cement mixing pile driving construction: place carries out cement mixing pile driving construction in design stake position, and cement mixing dowel section area is 1.05～1.10 times of left and right of outsourcing cement-soil sectional area;
4) construction equipment sinks: before cement-soil initial set, construction equipment after combination is vertically pressed in cement mixing pile, steel immersed tube center and cement mixing pile center coincide, until arrive design absolute altitude position, bottom surface; According to cement-soil mobility, control the speed that presses down, guarantee the outer row of cement, plug-hole not, substantially enter in steel immersed tube;
5) core stake presses down: cement-soil is back to squeeze in steel immersed tube stop after, before cement-soil initial set, aim at steel immersed tube central vertical and be pressed into prefabricated pile core, prefabricated pile core presses down the front sealing stake end that needs; Prefabricated pile core finally embeds in the open topped of pre-formed members pile top;
6) supplementing water earth: prefabricated pile core completes and presses down, adopts cement-soil backfill steel immersed tube internal pore part compacting to designing end face absolute altitude;
7) on, pull out steel immersed tube: dig geotechnological cloth bag outer, above pull out steel immersed tube, finishing top water earth, completes described Y shape pile driving construction.
The invention has the beneficial effects as follows:
(1) the present invention is pressed into the Y shape steel immersed tube with pre-formed members pile top in cement mixing pile, initial set cement-soil is not back to squeeze to immersed tube by pile top duct, at steel immersed tube, encloses under constraint, inserts prefabricated pile core compacted, feed supplement compacting again, the Y shape outsourcing cement-soil of formation form stable.
(2) the present invention adopts deep mixing method to form cement-soil, high compared to high-pressure rotary spraying method cement-soil Forming Quality; In it, be pressed into Y shape steel immersed tube, because cement-soil is back to squeeze, to steel immersed tube, outwards do not squeeze, compare that directly in the soil body, to be pressed into immersed tube soil compaction effect less.
(3) stake type of the present invention outside parcel Y shape cement earth pile, can increase composite pile unitary side frictional resistance, then strengthen its side friction, and the flexible pile body of Y shape in use damages than single Y shape reinforced concrete pile less on the impact of pile body bearing capacity.
(4) Xin Zhuanke factory of the present invention or job site are prefabricated, and operation is independent, can accelerating construction progress; Prefabricated pile core inserts not in initial set cement-soil, the cement-soil after can be compacted back to squeeze, and core stake has pressed down supplementing water earth compacting in rear immersed tube, the cement-soil bubble of digging formation back to squeeze when removing immersed tube and pressing down.
(5) the steel immersed tube adopting due to the present invention is Y shape abnormity immersed tube; inner wall surface area is larger; and cement earth pile is by repeatedly compacted compacting; while pulling out on immersed tube, easily take up cement-soil, after guaranteeing that steel immersed tube pulls up, outside Y shape cement earth pile figure shape reaches designing requirement; in immersed tube, be lined with geotextiles bag; and adopting and spinning geotextiles is raw material, can reinforce enhancing pile body, has planar isolated and defencive function.
In a word, the present invention gives full play to the long-pending lower shaped pile side friction of uniform section much larger than the feature of circular stake, and formation stiff-core cement soil composite pile that cement earth pile is combined with preformed pile, improve upper load transmission effect, performance inter-pile soil load-carrying properties, and by be pressed into corresponding band opening pile toe Y shape steel immersed tube cement-soil back to squeeze in cement earth pile before initial set not, soil compaction effect is less, has higher technical economic benefit.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of extrusion molding preformed pile of the present invention stiff-core cement soil Y shape stake;
Fig. 2 is that extrusion molding preformed pile stiff-core cement soil Y shape of the present invention stake is along A-A line sectional drawing;
Fig. 3 is schematic diagram after construction equipment combination of the present invention;
Fig. 4-a and Fig. 4-b are described pre-formed members pile top schematic diagrames;
Fig. 5 is that described pre-formed members pile top is along B-B line sectional drawing;
Fig. 6 is pile body cross section and sectional area conversion schematic diagram;
Fig. 7 is a kind of extrusion molding preformed pile of the present invention stiff-core cement soil Y shape pile driving construction schematic flow sheet;
Description of reference numerals: prefabricated pile core 1, outsourcing cement-soil 2, pile top 3, steel immersed tube 4, geotechnological cloth bag 5, stake underseal closing plate 6, limiting stand 7, pile top main body 8, open topped 9, bottom are uncovered 10, the outer sectorial area S of outsourcing cement-soil
1, prefabricated pile core region area S
2, outsourcing cement-soil sectional area S
3, the outer fan-shaped radius R of outsourcing cement-soil flange width L, outsourcing cement-soil, prefabricated pile core zone radius r.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is described further.Although the present invention is described in connection with preferred embodiment, should know, do not represent to limit the invention in described embodiment.On the contrary, the present invention is by alternative, modified and the equivalent contained in the scope of the present invention that can be included in attached claims restriction.
Fig. 1 is the schematic diagram of a kind of extrusion molding preformed pile of the present invention stiff-core cement soil Y shape stake; Fig. 2 is that the stake of the present invention's extrusion molding preformed pile of the present invention stiff-core cement soil Y shape is along A-A line sectional drawing.Shown in Fig. 1,2, the stake of a kind of extrusion molding preformed pile stiff-core cement soil Y shape mainly comprises: prefabricated pile core 1, outsourcing cement-soil 2, pre-formed members pile top 3 and geotechnological cloth bag 5 etc.
The present embodiment is usingd the prestressed reinforced concrete pipe pile of external diameter 500mm, wall thickness 100mm as prefabricated pile core 1, and adopting the fan-shaped radius R of 60 °, outsourcing cement-soil 2 outside central angle is that 1000mm, flange width are that 300mm is example.
According to design stiff-core cement soil Y shape stake size, make in advance construction equipment, as shown in Fig. 3～6.Steel immersed tube inside dimension corresponding with outsourcing cement-soil 2 sizes (allowable variation is at 0～+ 10mm), steel plate thickness is not less than 16mm, after employing round steel pipe and steel plate cutting, is welded.Pre-formed members pile top 3 is steel concrete pile top, and steel immersed tube connected unit 7, pile top main body 8 form, and integral body is hollow Y shape, and steel immersed tube connected unit 7 profiles are measure-alike with design outsourcing cement-soil 2, high 100mm; The high 750mm of pile top main body 8, the y-shaped cross-section (expanding 1.25 times than steel immersed tube connected unit 7) of radius 125mm, 60 ° of arc length of central angle and 375mm flange width is expanded as on top, close up gradually and dwindle into circle in bottom, diameter is identical with design cement mixing pile.The duct of perforation is left at pre-formed members pile top 3 middle parts, and upper and lower part, duct is uncovered is horn-like, by vertical channel, is communicated with, and open topped 9 is upwards opened, opening diameter 550mm, closing in diameter 450mm, open height 135mm; Open downwards bottom uncovered 10, opening diameter 800mm (being slightly less than cement mixing pile diameter), closing in diameter 450mm, open height 200mm.5 employings of geotechnique's cloth bag are spun geotextiles stitching and are formed, and size and shape is identical with outsourcing cement-soil 2, and more than length compares to the long 500mm of steel immersed tube 4, while guaranteeing combination unit, steel immersed tube 4 all can be routed up in geotechnique's cloth bag 5 two ends.
After construction plant is peaceful, in design stake position, carry out cement mixing pile driving construction, conversion cement mixing pile stake footpath before construction, the cement mixing dowel section area of take equates as theoretical foundation with outsourcing cement-soil cross section, as shown in Figure 7, outsourcing cement-soil sectional area is that large triangle area deducts three homalographic outsourcing cement-soil sectorial areas, deducts prefabricated pile core region area again,
Being scaled cement mixing pile diameter is
with R=1000mm, r=250mm, L=300mm is example, and theoretical cement mixing pile diameter is 825mm, and pile peripheral earth does not enter in immersed tube when guaranteeing follow-up immersed tube, suitably expands cement mixing pile diameter.Adopt this place of constructing operation of deep mixing method construction cement mixing pile no longer to describe in detail, strictly follow the requirement of existing job specfication, rules.
After cement mixing pile driving construction completes, before cement-soil initial set, construction equipment after combination is pressed in cement-soil, steel immersed tube center and cement mixing pile center coincide, and vertical depression, until arrive design absolute altitude position, bottom surface.Because uncovered 10 diameters in pre-formed members pile top 3 bottoms approach cement earth pile diameter, according to cement-soil mobility, control and to press down speed, can guarantee the outer row of cement, plug-hole not, substantially enter in steel immersed tube.
To the interior insertion prefabricated pile core 1 of steel immersed tube 4 of cement-soil back to squeeze, the present embodiment adopts prestressed reinforced concrete pipe pile, therefore under press down front pile tube bottom and need with 6 sealings of stake underseal closing plate, a stake underseal closing plate 6 can adopt circular steel plate welded closure or concrete to shift to an earlier date plug-hole.When inserting, prefabricated pile core guarantees between two parties, vertically, finally to embed in the open topped 9 of pre-formed members pile top 3.
Prefabricated pile core 1 inserts, make the interior cement-soil of steel immersed tube 4 suitably full, closely knit, but possibly cannot be filled to design height, therefore by artificial mixing water earth, and to filling in steel immersed tube 4, compacting, until design end face absolute altitude finally pulls out steel immersed tube 4 in vibration, complete described extrusion molding preformed pile stiff-core cement soil Y shape pile driving construction.
The construction method of extrusion molding preformed pile stiff-core cement soil Y shape stake, mainly comprises the following steps:
1) before construction, prepare: peaceful place, construction machinery, prefabricated pile core 1 are marched into the arena in time, the members such as pre-manufactured steel immersed tube 4, opening pile toe 3 and geotechnological cloth bag 5;
2) device combination: geotechnological cloth bag 5 is penetrated in steel immersed tube 4, and geotechnological cloth bag 5 first and last end sack turnup tapping immersed tube 4, guarantee that bag opens, and steel immersed tube 4 one end are connected with pre-formed members pile top upper limit platform 7;
3) cement mixing pile driving construction: convert and determine after cement mixing pile diameter according to area, place carries out cement mixing pile driving construction in design stake position;
4) device sinks: machinery is helped the construction equipment after combination, determines behind cement mixing pile center that device vertical depression, until design bottom surface absolute altitude presses down control device subsidence velocity in process, prevents plug-hole;
5) core stake presses down: after back to squeeze the stopping of the interior cement-soil of steel immersed tube 4, before cement-soil initial set, aim at steel immersed tube 4 central vertical and be pressed into prefabricated pile core 1, pile tube presses down the front sealing stake end that needs;
6) supplementing water earth: prefabricated pile core 1 completes and presses down, adopts cement-soil backfill steel immersed tube 4 internal pore parts, and suitably compacting, makes the prefabricated strength core of the complete parcel of cement-soil stake 1;
7) on, pull out steel immersed tube: cement-soil backfill compacting, to design attitude, is dug the outer of geotechnological cloth bag 5 warps, above pulls out steel immersed tube 4, finishing top water earth, completes described Y shape pile driving construction.
Claims (6)
1. an extrusion molding preformed pile stiff-core cement soil Y shape stake, is characterized in that: comprise outsourcing cement-soil (2), prefabricated pile core (1) and pre-formed members pile top (3); Described outsourcing cement-soil (2) cross section is Y-shaped, is surrounded by geotextiles bag (5) outward, by steel immersed tube (4), encloses restriction molding; Described prefabricated pile core (1) is positioned at steel immersed tube (4) central axis position, and its lower end embeds in pre-formed members pile top (3).
2. extrusion molding preformed pile stiff-core cement soil Y shape according to claim 1 stake, is characterized in that: described prefabricated pile core (1) adopts steel concrete solid pile, pile for prestressed pipe or steel pipe pile, and pile tube bottom is provided with a underseal closing plate (6).
3. extrusion molding preformed pile stiff-core cement soil Y shape according to claim 1 stake, it is characterized in that: described pre-formed members pile top (3) main body is Y-shaped, pile top (3) top is provided with steel immersed tube limiting stand (7), the duct of perforation is left at pile top (3) middle part, upper and lower part, duct is uncovered is horn-like, bottom uncovered (10) diameter is less than cement mixing pile diameter 10～30mm, and open topped (9) diameter is greater than prefabricated pile core (1) diameter 20～50mm.
4. extrusion molding preformed pile stiff-core cement soil Y shape according to claim 1 stake, it is characterized in that: described steel immersed tube (4) cross section is Y shape, amass as outsourcing cement-soil (2) sectional area and prefabricated pile core (1) cross section sum steel immersed tube (4) design section.
5. extrusion molding preformed pile stiff-core cement soil Y shape according to claim 1 stake, is characterized in that: described geotechnological cloth bag (5) employing is spun geotextiles and made, and bottom is connected with pre-formed members pile top (3).
6. a construction method for the arbitrary described extrusion molding preformed pile stiff-core cement soil Y shape of claim 1～5 stake, is characterized in that, mainly comprises the following steps:
1) before construction, prepare: peaceful place, construction machinery, prefabricated pile core are marched into the arena in time, the members such as pre-manufactured steel immersed tube, opening pile toe and geotechnological cloth bag;
2) construction equipment combination: geotechnological cloth bag (5) is penetrated in steel immersed tube (4), geotechnique's cloth bag (5) first and last end sack turnup tapping immersed tube (4), guarantee that bag opens, steel immersed tube (4) one end is connected with the limiting stand (7) in pre-formed members pile top (3);
3) cement mixing pile driving construction: place carries out cement mixing pile driving construction in design stake position, and cement mixing dowel section area is 1.05～1.10 times of left and right of outsourcing cement-soil sectional area;
4) construction equipment sinks: before cement-soil initial set, construction equipment after combination is vertically pressed in cement mixing pile, steel immersed tube (4) center and cement mixing pile center coincide, until arrive design absolute altitude position, bottom surface; According to cement-soil mobility, control the speed that presses down, guarantee the outer row of cement, plug-hole not, substantially enter in steel immersed tube;
5) core stake presses down: after back to squeeze the stopping of the interior cement-soil of steel immersed tube (4), before cement-soil initial set, aim at steel immersed tube (4) central vertical and be pressed into prefabricated pile core (1), prefabricated pile core (1) presses down the front sealing stake end that needs; Prefabricated pile core (1) finally embeds in the open topped (9) of pre-formed members pile top (3);
6) supplementing water earth: prefabricated pile core (1) completes and presses down, adopts cement-soil backfill steel immersed tube (4) internal pore part compacting to designing end face absolute altitude;
7) on, pull out steel immersed tube: dig geotechnological cloth bag (5) outer, above pull out steel immersed tube (4), finishing top water earth, completes described Y shape pile driving construction.
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| CN201410382166.4A CN104141304B (en) | 2014-08-06 | 2014-08-06 | The construction method of a kind of extrusion molding preformed pile stiff-core cement soil Y shape stake |
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| CN201410382166.4A CN104141304B (en) | 2014-08-06 | 2014-08-06 | The construction method of a kind of extrusion molding preformed pile stiff-core cement soil Y shape stake |
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| CN105780766A (en) * | 2016-04-20 | 2016-07-20 | 四川华西管桩工程有限公司 | Drilling backfill end bearing pile foundation and construction method thereof |
| CN106337413A (en) * | 2016-09-07 | 2017-01-18 | 东南大学 | Water-draining stiff geo-textile bag cement-soil composite pile and construction method thereof |
| CN107034878A (en) * | 2017-04-17 | 2017-08-11 | 中国十七冶集团有限公司 | A kind of gear shape composite pile and its construction method |
| CN111101504A (en) * | 2019-12-30 | 2020-05-05 | 中交武汉港湾工程设计研究院有限公司 | Stabilized soil extrusion curing precast pile and soft foundation treatment method applied to same |
| CN115324281A (en) * | 2022-08-22 | 2022-11-11 | 华南理工大学 | Compacted confined cement column for resource utilization of engineering muck and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105780766A (en) * | 2016-04-20 | 2016-07-20 | 四川华西管桩工程有限公司 | Drilling backfill end bearing pile foundation and construction method thereof |
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| CN111101504A (en) * | 2019-12-30 | 2020-05-05 | 中交武汉港湾工程设计研究院有限公司 | Stabilized soil extrusion curing precast pile and soft foundation treatment method applied to same |
| CN115324281A (en) * | 2022-08-22 | 2022-11-11 | 华南理工大学 | Compacted confined cement column for resource utilization of engineering muck and construction method thereof |
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| Publication number | Publication date |
|---|---|
| CN104141304B (en) | 2016-02-24 |
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