CN1082650A - A kind of castinplace pile and "forming column thereof - Google Patents
A kind of castinplace pile and "forming column thereof Download PDFInfo
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- CN1082650A CN1082650A CN 93106446 CN93106446A CN1082650A CN 1082650 A CN1082650 A CN 1082650A CN 93106446 CN93106446 CN 93106446 CN 93106446 A CN93106446 A CN 93106446A CN 1082650 A CN1082650 A CN 1082650A
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Abstract
A kind of castinplace pile and "forming column thereof.This castinplace pile is to be provided with a conveyor screw at existing pile body surface, and the stake end is provided with platform, and the stake termination is the plane.Hole earlier during pile to desired depth; On hole wall, process screw with the conveyor screw cutter again, at the bottom of the hole, process platform, and with the loosened soil compacting; To desire castinplace pile and be divided at least three sections, segmentation is finished every section be lowered to respectively and is with the nozzle Grouting Pipe, throws in required sand, stone, and the slip casting of pressurizeing is stirred; Last pile.The present invention has increased the contact area of bearing mode and the stake end and the ground of stake, and the concrete cement of pile body, sand, stone are evenly distributed, the intensity height, and cost is low.
Description
The present invention relates to cast-in-place concrete pile and piling method thereof in a kind of Foundation Design.
At present, domestic and international widely used pile foundation is divided into preformed pile and castinplace pile.Preformed pile is in advance stake to be made, and squeezes into or be pressed into underground then with special equipment, produces noise and air pollution during construction, is limited to use in the city; For harder stratum, squeeze into difficulty, easily cause and split post, curved stake or broken pile; Need pile extension for deep foundation, be difficult to guarantee the straightness accuracy and the verticality of stake.Castinplace pile is to hole on ground earlier, concrete perfusion pile in the hole then, and this "forming column advantage is more, but still has certain defective, as: cement consumption is big, easily causes broken pile, undergauge.Use long-armed auger bore, the technology of high-pressure slip-casting pile, owing to be that stone aggregate and cement paste are poured into respectively 1., stone is again prior disposable pouring into, thereby it is inhomogeneous that the pile body concrete is stirred, and still has broken pile; 2. be that the position that behind concrete disintegration and the pile there is pile body is neat slurry entirely, the position stone that has is too concentrated again, and because the limitation of job practices and equipment, the pile body concrete is a non-fine concrete, thereby greatly reduces strength of the mixing pile.On October 21st, 1987, disclosed CN86100705 B disclosed a kind of " bore slurry pressuring pile-forming ", and this stake is the non-fine concrete stake, and the pile body concrete strength is relatively poor; Cement consumption is very big, makes cost increase by three times; This technology is to inject cement paste behind the spiral pore-forming in advance, pour stone more respectively into, be difficult to grasp the water/binder ratio example of concrete itself like this, must excess injecting cement paste could get excited and poured stone in the hole into, thereby pile body concrete moisture content is excessive, make pile body surface produce undergauge, the pile body concrete quality is relatively poor; Because cement paste and stone are to pour into respectively, and stone is disposable whole input, so pile body stone skewness behind the pile influences even that strength of the mixing pile distributes; Because charging time is inconsistent, cause the first half pressure of stake not reach requirement after the pressurization, the top pile concrete is fixed undesirable, even honeycombing occurs, influences pile body bearing capacity.Because the restriction of construction technology and equipment, no matter be preformed pile or castinplace pile, its pile body profile is cylinder or square body, and pile body surface is even surface, and the stake end is taper, referring to Fig. 1.The pile of the shape position that is subjected to load and mode one are that a stake end 3 by taper contacts with ground 4 like this, with the formation resistance bearing load; The 2nd, lean on the surface 2 of pile body 1 to contact with stratum 5, rely on pile body surface frictional force bearing load.If the stress layer ground 4 of stake end 3 is very hard, then pile body 1 is main by stake end 3 bearing loads; If the stress layer of stake end belongs to soft layer, then mainly lean on the frictional force bearing load of pile body surface 2.Adopt existing construction technology, the frictional force of general pile body surface 2 is less, thereby main by stake end 3 bearing loads.For the stake end bearing, its pyramidal structure makes when stressed because of there is bigger contact stress on end and stratum, thereby bearing capacity is reduced, and greatly reduces pile foundation itself to the top ability to bear of load greatly.Pile body surface frictional force be rely on pile body surface and on every side the contact pressure between the soil layer produce, castinplace pile is owing to spontaneous combustion solidification shrinkage behind the concrete spouting produces the undergauge phenomenon, in addition, when construction, sometimes adopt the technology of mud off, form one deck mud at the hole inwall, this all can make pile body surface frictional force reduce.Castinplace pile because loosened soil is difficult to take out at the bottom of the hole, causes an end loosened soil too much in drilling construction, and an end bearing power reduces, settling amount strengthens and make, and loosened soil can make an end concrete quality reduce simultaneously, also influences bearing capacity.
The objective of the invention is to avoid above-mentioned weak point of the prior art, and provide a kind of end and contact area of ground big; Increased the bearing mode of stake, pile body cooperates with the stratum closely; Stake basis, end is solid; The concrete cement of pile body, sand, stone are evenly distributed, the intensity height; Can save a large amount of cement, castinplace pile and "forming column thereof that cost is low.
Purpose of the present invention can reach by following measure:
A kind of castinplace pile comprises pile body, and its special character is that the external surface of described pile body is provided with the conveyor screw that protrudes in pile body surface, and described pile body end is provided with platform, and the termination of stake end is a plane.
A kind of "forming column of processing above-mentioned castinplace pile is holed earlier to desired depth, extracts drilling rod, and its special part is: the conveyor screw cutter is fixed on the drilling rod, and inwall processes screw in the hole; When the conveyor screw cutter walks at the bottom of the hole, its base plate with the hole at the bottom of the loosened soil gyratory compaction, the groove of end platform that portals of processing simultaneously; Extract drilling rod and put into reinforcing cage; To desire castinplace pile and be divided at least three sections, every section the steel pipe Grouting Pipe that is lowered to the band nozzle is finished in segmentation respectively, throws in required sand, stone, and the slip casting of pressurizeing is stirred; Finish whole castinplace pile at last.
Second section Grouting Pipe that is lowered to of the present invention and the Grouting Pipe that is lowered to later, its nozzle all makes progress.
During castinplace pile segmentation of the present invention, every section Duan Shen is decided by castinplace pile length, diameter and grouting pressure.
Every section volume decision of throwing in the quantity of cement, sand, stone of castinplace pile of the present invention by every section stake.
The accompanying drawing drawing is described as follows:
Fig. 1 is the structural representation of prior art pile body.
Fig. 2 is the structural representation of pile body of the present invention.
Fig. 3～4 are the structural representation of conveyor screw cutter of the present invention.
The invention will be further described below in conjunction with drawings and Examples:
Referring to Fig. 2, castinplace pile of the present invention is to be provided with one to protrude in surface 2 conveyor screw 7 on the pile body surface 2 of pile body 1, and conveyor screw 7 embeds stratum 5, and pile body and stratum are closely cooperated, and completely is one.The size of pile body bearing capacity is by the decision of the shear strength limit of foundation soil, thereby the bearing capacity of conveyor screw 7 will be higher than cylinder smooth surface pile body frictional force far away.Stake end 3 is cylindric planar ends, and stake also is provided with platform 6 on the end 3, the contact area of an end and ground 4 is increased, thereby increase bearing capacity of pile tip.The shape that conveyor screw 7 its cross sections of the present invention can be is trapezoidal, zigzag, triangle, rectangle, circular arc and above-mentioned combination of shapes become etc.; The big I of conveyor screw 7 pitch is adjusted according to factor such as foundation soil structure, construction cutter section size, bearing capacity size.
Fig. 3～4 are the structural representation of the conveyor screw cutter of processing conveyor screw 7 grooves used in the present invention's construction.The tool head box 10 of rotary body cutter has a casing 13, and its top is a upper cover plate 12, and upper cover plate 12 is provided with the flange 11 that is connected usefulness with drilling rod, and casing 13 bottoms are base plate 15, is respectively equipped with earth discharging hole 14 and 18 on casing 13 and the base plate 15.Stretch out outside the casing 13 cutter 8 front portions, remains level for guaranteeing to add man-hour cutter 8 front ends, and the weight of cutter 8 afterbodys is greater than the front portion, and when cutter 8 front ends kept level, its afterbody just in time contacted the location with base plate 15.A stressed plate 17 also can be established at cutter 8 afterbodys and 15 of base plates in the contact location of cutter 8 afterbodys, like this, can save the materials of different model cutter.Cutter 8 is provided with alignment pin 9, and cutter 8 can rotate around it, and can only move vertically downward.Cutter 8 is gripped by inner reinforced plate 16.During use, tool head box 10 is connected and fixed by flange 11 and drilling rod, along with the rotation of drilling rod, cutter 8 processes screw on the good hole wall of brill, cutter 8 is processed from top to bottom, and it is subjected to a vertical force that makes progress, and this can offset by the reaction force of 15 pairs of cutter 8 afterbodys of base plate; The horizontal force opposite with its direction of rotation that cutter 8 front ends are suffered comes balance by cutter 8 front portions with the contact site of casing and the contact site of cutter 8 afterbodys and inner reinforced plate 16.The loosened soil of processing is entered in the casing 13 by the earth discharging hole 14 of casing 13, again by base plate earth discharging hole 18 discharge fall into the hole at the bottom of.Tool head box 10 falls at the bottom of the hole, and base plate 15 processes the groove of a platform 6 simultaneously with loosened soil compacting, pressing at the bottom of the hole on the diapire of hole.Completion of processing is carried on the drilling rod, and hole wall gives cutter 8 anterior downward power, and cutter 8 rotates around steady pin 9, cutter 8 afterbody perks, and the front portion is pressed in the casing 13.
During construction, can select for use deep hole rig to get out cylindrical hole, get into projected depth after, extract drilling rod, change the conveyor screw cutter, on the cylindrical hole inwall, process screw, in position, bottom, hole, the conveyor screw cutter is detained rotation, processes the groove of platform 6, simultaneously loosened soil at the bottom of the hole being carried out spinning handles, loosened soil at the bottom of the cleaning hole, with ground 4 compactings, this not only can improve the ground supporting force, and can improve an end quality of concrete, improve stake end bearing power.Helical tooth blade is withdrawed from, put into reinforcing cage.To desire castinplace pile according to diameter, pile body length and the grouting pressure of the section of pile body own and be divided at least three sections, diameter is big more, and every section the degree of depth is shallow more, and then grouting pressure is more little, when specifically constructing, as long as slip casting can be stirred moving sand, stone.General castinplace pile below 15 meters can be divided into three sections, and 15 meters～20 meters castinplace piles can be divided into four sections.Design cement paste ratio and every section grouting pressure, put into first section steel pipe Grouting Pipe earlier, the nozzle of this Grouting Pipe front end can be downward, also can make progress; Pour first section required sand, stone then into; Carry out first section pressurization slip casting and stir, the interior sand of first section pile body, stone are mixed.Be lowered to second section steel pipe Grouting Pipe, in order not influence first section pile body that has mixed, the nozzle of this Grouting Pipe up; Pour second section required sand, stone into, carry out second section pressurization slip casting and stir.Be lowered to the 3rd section steel pipe Grouting Pipe, its nozzle also up; Pour the 3rd section required sand, stone into, carry out the 3rd section pressurization slip casting and stir whole pile body pour-shaping.
The present invention compared with prior art has following advantage:
1, increases conveyor screw in existing cylinder grout pile surface and form screw pouring piles, because structural change, increased the bearing mode of stake, keeping outside the former pile peripheral friction force bearing mode, increased again ground by the supporting force of conveyor screw to stake, as calculated, this part supporting force exceeds the pile peripheral friction force of same pile body more than two times.
2, owing to loosened soil at the bottom of the hole carried out spinning process, removed loosened soil at the bottom of the hole, with basis compaction, both improved the ground supporting force, improve again a stake end concrete quality, thereby improved the overhang bracket power of stake.
3, the end of screw pouring piles is the plane, has increased again complementary platform, and it is above that stake end bearing area is doubled than former taper bearing area, thereby bearing capacity is improved.
4, screw pouring piles is because being subjected on every side ground to do the time spent to revolving the supporting force effect of body when being subjected to eccentric load, and the supporting force of ground forms the moment of flexure that the reaction moment balance eccentric load causes, therefore makes stake can bear the eccentric load bigger than common cylinder stake.
5, cylinder pile of the prior art has certain anti-uplift force function, but the structure of screw pile makes stake connect more closely with ground, can bear higher uplift force.
6, screw pouring piles has preferably stability, especially in upper hard lower soft ground, screw pile can with top hard formation close-coupled, as sedimentation takes place, can only be stake and simultaneously sedimentation of ground. Screw pouring piles also has preferably stability than other stake under the various forms effect of vibration, preferably antihunt action is especially arranged when earthquake.
7, because of screw pile bearing capacity height, under the condition of identical stake diameter and length, screw pile exceeds more than 2～3 times than the bearing capacity of cylinder pile in the prior art.Under identical carrying condition, screw pile lacks than the common cylinder stake uses raw material more than 1/3rd.
8, the pile body concrete has improved the concrete intensity of pile body significantly for sand concrete is arranged, and has increased the bearing capacity of pile body itself.
9, a large amount of cement have been saved in the adding of pile body concrete sand aggregate, greatly reduce cost.
10, use segmentation to feed intake and the technology of segmental machining, the concrete cement of pile body, sand, stone are mixed, improved the quality of stake; And can carry out the proportioning of cement, sand, stone according to required concrete intensity.
Claims (5)
1, a kind of castinplace pile comprises pile body, it is characterized in that: the external surface of described pile body is provided with the conveyor screw that protrudes in pile body surface, and described pile body end is provided with platform, and the termination of stake end is a plane.
2, a kind of processing "forming column of castinplace pile is according to claim 1 holed earlier to desired depth, extracts drilling rod, and it is characterized in that: the conveyor screw cutter is fixed on the drilling rod, and inwall processes screw in the hole; When the conveyor screw cutter walks at the bottom of the hole, its base plate with the hole at the bottom of the loosened soil gyratory compaction, the groove of end platform that portals of processing simultaneously; Extract drilling rod and put into reinforcing cage; To desire castinplace pile and be divided at least three sections, every section the steel pipe Grouting Pipe that is lowered to the band nozzle is finished in segmentation respectively, throws in required sand, stone, and the slip casting of pressurizeing is stirred; Finish whole castinplace pile at last.
3, bored pile piling method as claimed in claim 2 is characterized in that: second section Grouting Pipe that is lowered to and the Grouting Pipe that is lowered to later, its nozzle all makes progress.
4, as claim 2 or 3 described bored pile piling methods, it is characterized in that: during described castinplace pile segmentation, every section Duan Shen is decided by castinplace pile length, diameter and grouting pressure.
5, bored pile piling method as claimed in claim 4 is characterized in that: every section volume decision of throwing in the quantity of cement, sand, stone by every section stake of described castinplace pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93106446 CN1082650A (en) | 1993-06-02 | 1993-06-02 | A kind of castinplace pile and "forming column thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93106446 CN1082650A (en) | 1993-06-02 | 1993-06-02 | A kind of castinplace pile and "forming column thereof |
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| Publication Number | Publication Date |
|---|---|
| CN1082650A true CN1082650A (en) | 1994-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93106446 Pending CN1082650A (en) | 1993-06-02 | 1993-06-02 | A kind of castinplace pile and "forming column thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1037120C (en) * | 1995-03-25 | 1998-01-21 | 张国梁 | Construction method of pile and special equipment thereof |
| CN102031778A (en) * | 2010-12-09 | 2011-04-27 | 哈尔滨工业大学 | Screw pile used for seasonally frozen ground zone |
| CN102312433A (en) * | 2011-04-26 | 2012-01-11 | 王庆伟 | Pile forming method for pipe sinking pressure grouting screw pile |
| CN106703025A (en) * | 2017-02-27 | 2017-05-24 | 河南省交通规划设计研究院股份有限公司 | Spiral pile and construction method thereof |
| CN107386281A (en) * | 2017-07-20 | 2017-11-24 | 重庆交通大学 | Screw rod uplift pile and its construction method under a kind of upper straight rod suitable for seasonal frozen soil region |
-
1993
- 1993-06-02 CN CN 93106446 patent/CN1082650A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1037120C (en) * | 1995-03-25 | 1998-01-21 | 张国梁 | Construction method of pile and special equipment thereof |
| CN102031778A (en) * | 2010-12-09 | 2011-04-27 | 哈尔滨工业大学 | Screw pile used for seasonally frozen ground zone |
| CN102031778B (en) * | 2010-12-09 | 2012-07-25 | 哈尔滨工业大学 | Screw pile used for seasonally frozen ground zone |
| CN102312433A (en) * | 2011-04-26 | 2012-01-11 | 王庆伟 | Pile forming method for pipe sinking pressure grouting screw pile |
| CN106703025A (en) * | 2017-02-27 | 2017-05-24 | 河南省交通规划设计研究院股份有限公司 | Spiral pile and construction method thereof |
| CN107386281A (en) * | 2017-07-20 | 2017-11-24 | 重庆交通大学 | Screw rod uplift pile and its construction method under a kind of upper straight rod suitable for seasonal frozen soil region |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |