CN104762957B - A kind of spiral pore-forming rams the construction method that expands CFG stake - Google Patents

A kind of spiral pore-forming rams the construction method that expands CFG stake Download PDF

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Publication number
CN104762957B
CN104762957B CN201510192004.9A CN201510192004A CN104762957B CN 104762957 B CN104762957 B CN 104762957B CN 201510192004 A CN201510192004 A CN 201510192004A CN 104762957 B CN104762957 B CN 104762957B
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hole
stake
casing
pile
cylinder
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CN104762957A (en
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彭波
高晓峰
任东兴
李耀家
彭涛
邓安
罗东林
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CREEC Chengdu Survey Design and Research Co Ltd
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CREEC Chengdu Survey Design and Research Co Ltd
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Abstract

The invention discloses a kind of spiral pore-forming and ram the construction method that expands CFG stake, exist collapse hole, undergauge, underground water and bearing course at pile end weak and cause technique failure, concrete disintegration, construction cost is high and pile body bearing capacity is poor problem for solving existing CFG stake. The present invention includes 1, fixed pile; 2, pore-forming; 3, casing is installed; 4, throw in aggregate; 5, ram cylinder in installing and hammer ram tamp the expansion end at the bottom of to hole; 6, at the bottom of compacting pile and form enlarged footing at the bottom of hole; 7, throw in compound or casting concrete; 8, vibration compacting. The present invention is in the process of construction, and casing plays the effect of retaining wall and water proof always to stake hole, prevent undergauge problem; Underground water is discharged by gap between casing and interior rammer cylinder, has ensured in time underground water to be discharged, and improves the quality of pile body; While carries out compacted on the one hand to undisturbed soil, be formed on the other hand stake end and formed enlarged footing, and bearing capacity of single pile is provided greatly, and composite foundation cost greatly reduces.

Description

A kind of spiral pore-forming rams the construction method that expands CFG stake
Technical field
The invention belongs to CFG stake technical field, be specifically related to a kind of spiral pore-forming and ram the construction method that expands CFG stake.
Background technology
CFG stake is the abbreviation of English CementFly-ashGravel, means CFG, by rubble, stoneBits, sand, flyash mixed cement add water and mix, the variable intensity stake with some strength of making by various forming machinery. CFG stakeBe a kind of Low Intensity Concrete Piles, CFG pile composite foundation can make full use of the bearing capacity acting in conjunction of inter-pile soil, and can transmit lotusBe downloaded in deep foundation base and go, there is good technical skills and economic effect.
By adjusting cement mixing content and proportioning, its strength grade changes between C15-C25, is with flexible between rigid pileA kind of stake type between stake. CFG stake, together with inter-pile soil, forms CFG pile composite foundation by mattress layer and jointly works, therefore can rootCarry out engineering design according to composite foundation proterties and calculating. CFG stake generally need not be calculated arrangement of reinforcement, and can utilize industrial waste powderCoal ash and aggregate chips are made admixture, have further reduced construction costs, and therefore, CFG stake has extremely strong practicality.
The utility model patent that for example application number is 201320732862.4 discloses a kind of spiral pump pressure CFG stake, comprisesCFG pile body is provided with block on CFG pile body, is provided with sandy gravel stratum on block, and sandy gravel stratum top is provided with ground;Sandy gravel stratum thickness is 0.5~3m.
CFG pile constructing process mainly comprises the following steps:
1, stake machine enters scene, determines bracket height and immersed tube length, and carry out according to designing pile length, immersed tube embedded depthDevice assembles;
2, pile-forming machine perching, adjusts immersed tube perpendicular to the ground, and (ordinary circumstance is sagging to guarantee to meet technological requirement by perpendicularity deviationStraight degree deviation is not more than 1%);
3, starter, immersed tube, to predetermined absolute altitude, is shut down;
4, in immersed tube process, make a record, often the electric current on heavy 1m recording ammeter once, and to soil layer variation place toExplanation;
5, shut down after immediately to concrete perfusion in pipe, until concrete is concordant with charging aperture, after pile, laitance thickness is notExceeding 10cm is advisable;
6, starter, vibration staying 5-10s, starts tube drawing, pipe-drawn speed is generally 1.2-1.5m/min, as mud orMuck soil, pipe-drawn speed also should slow down, and does not allow anti-plug in tube drawing process; As material loading deficiency, must be aerial in tube drawing processFeed intake, to ensure after pile that top mark is up to designing requirement;
7,, after confirming that pile composite design requires, bind with bulk material or wet cohesive soil.
The patent of invention that for example application number is 201210360308.8 discloses a kind of construction technology of CFG stake, comprise withLower step: (1) pile-forming machine perching, will be placed in pile pipe with the suitable sack in stake footpath, tie a knot and be placed in the bottom of described sackThe bottom of pile pipe, stretch out from the infusion funnel on described pile pipe top on the top of described sack, and the bottom of described pile pipe is just positioned at and treatsThe position of piling; (2) start described stake machine described pile pipe is beaten to projected depth, delivery pump is in place, and upper by described sackPortion is set on the pump line of delivery pump; (3) in described sack, pour into material of body of a pile to design stake top by described delivery pump;(4) start stake machine described pile pipe is slowly mentioned to ground, in described sack, supplement material of body of a pile to design stake top simultaneously;(5) cut off described sack at stake top place, and be placed in again institute's pile pipe after being positioned at the lower ending opening knotting of sack of described pile pipeBottom, then described stake machine is moved to next stake position and constructs; Sack is made as woven bag or gunnysack or adds the volume of iron wireKnit bag or add the gunnysack of iron wire; In step (2), the top of sack is set on the pump line of delivery pump after stretching out infusion funnel.
Application number is the improvement construction technology that 201010019478.2 patent of invention discloses a kind of CFG stake, comprise asLower step: A, layout stake position: in construction area, determine the number of CFG stake, and the position distribution of definite CFG stake; B, in stake positionGo out to punch and sink to pile pipe; C, in the pile pipe of avaling, lay high-pressure slip-casting pipe and throw in aggregate, aggregate can be rubble orThe rubble of configuration and the compound of sand in proportion; D, extract pile pipe and to the aggregate in hole do compacting process; E, cleaning treatment, logicalCross water filling in high-pressure slip-casting Guan Xiangguan, aggregate in hole and hole is cleaned, until aperture has gone out clear water; F, slip casting becomeStake: utilize high-pressure slip-casting pipe to have to input in the hole of aggregate and inject pulverized fuel ash cement or water of coal ash cement mortar, until slurries fromAfter emerging in aperture, stop slip casting, extract high-pressure slip-casting pipe, construction finishes.
Application number be 201110181728.5 patent of invention disclose one continuously construction operation slip casting type CFG stake executeWork method, the method comprises the following steps: 1) oscillation pipe sinking machine pore-forming: after leveling place, after pile-forming machine perching, starter,Sink to immersed tube to predetermined absolute altitude, shut down; 2) Laying injection pipe and throw in aggregate: after shutdown immediately to Laying injection pipe in immersed tube,The lower end of Grouting Pipe must be placed to from 20cm place at the bottom of hole, starts to throw in the aggregate by design proportioning after placing Grouting Pipe, canTo be rubble or the compound of preparing in proportion rubble and sand, rubble requires the rubble of 2-4cm, and sand is medium coarse sand, clay contentBe no more than 3%, all must check and meet code requirement, the aggregate of input calculates by fullness coefficient 1.05; 3) tube drawing and clear hole:Starter, vibration staying 5~10s, starts to extract immersed tube, meanwhile by Grouting Pipe to water filling in hole, to aggregate in hole and holeClean, until clear water is overflowed in aperture; 4) grouting pile-forming: the slurry of grouting is ash cement slurry or water of coal ashCement mortar, slurries adopt 42.5 grades or 52.5 grades of Portland cements; The ratio of mud general control of pure fly ash cement groutBetween 0.4-0.5, the ratio of mud of water of coal ash cement mortar is to be controlled between 0.5-0.6.
But existing CFG stake exists following technical problem:
Be 201010019478.2 and 201110181728.5 patent of invention as application number, owing to first pile pipe being pulled outGo out, due to the variation of geological stratification structure, easily there is the situation of undergauge in stake pore volume.
In prior art because needs are to cleaning in stake hole, thereby cause activity time long, increased the one-tenth of constructionThis, the process of simultaneously cleaning due to water, and the process of not carrying out draining in prior art, what cause pouring into a mould in water is mixedSolidifying native bearing capacity is poor.
So how, ensureing not undergauge, can shorten operation, improve bearing capacity, the cost that reduces pile is this alwaysThe direction of technical staff's research in field.
Summary of the invention
There is collapse hole, undergauge, underground water and bearing course at pile end weakness and cause work in the present invention in order to solve existing CFG stakeSkill failure, concrete disintegration, the problem that construction cost is high and pile body bearing capacity is poor, expand CFG and provide a kind of spiral pore-forming to ramThe construction method of stake, has solved because earth formation changes the undergauge problem causing, underground water is by between casing and interior rammer cylinderDischarge in gap, has ensured that underground water can discharge in time, and to the compacting that feeds intake of hole, stake hole, one side is rammed undisturbed soilReal, form enlarged footing at stake end on the other hand, greatly improve bearing capacity of single pile, reduce the cost of composite foundation.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
Spiral pore-forming rams a construction method that expands CFG stake, it is characterized in that, comprises the following steps:
(1), fixed pile: the number of definite CFG stake in construction area, and the position distribution of definite CFG stake;
(2), pore-forming: twist bit is in place, starter, auger boring is shut down after predetermined absolute altitude, extracts auger stem;
(3), casing is installed: described casing is set in a hole, and the length of described casing is not less than the degree of depth in a hole;
(4), throw and expand end aggregate;
(5), ram cylinder in installing and hammer ram tamp the expansion end at the bottom of to hole, stake hole: described interior rammer jacket casing is located in casing, instituteState between interior rammer cylinder and casing and there is the gap for draining; The described interior inside of ramming cylinder is provided with hammer ram, described interior length of ramming cylinderDegree is greater than the length of casing; The described interior upper end of ramming cylinder is connected with lifting device; In driving, lifting device rams cylinder at the bottom of hole, stake holeTamp, at the bottom of casing being sunk to a hole, hole and by the underground water in stake hole, between casing and interior rammer cylinder, squeeze out simultaneously;
(6), at the bottom of hole, compacting pile hole and form enlarged footing at the bottom of hole: promote interior the rammers cylinder that contains hammer ram, by lifting device elder generationCompacting at the bottom of hole, stake hole is dropped into aggregate again tamps and forms enlarged footing at the bottom of hole;
(7), throw in compound, interior the rammers cylinder that contains weight is lifted out outside a hole, in stake hole, build prefabricated mixingClose material;
(8), vibration compacting: by inserting vibrating head by compound vibration compacting, until build to predetermined absolute altitude, vibratingIn closely knit process, promote casing simultaneously.
Described aggregate is rubble, cobble or builds slag, and the particle diameter of described aggregate is at 10-20cm.
The upper top of described casing is provided with end cap, and the described interior upper top of ramming cylinder is provided with and the end cap end of adaptation mutuallyLid.
Complete after pile body cast, in the upper end of pile body, mattress layer is set.
Compared with prior art, the present invention has following beneficial effect:
Spiral pore-forming of the present invention rams the construction method that expands CFG stake, and in the process of construction, casing is always right in stake holeThe effect of retaining wall is played in stake hole, prevents and changes the undergauge problem causing because of earth formation. The present invention is at the bottom of to hole, stake holeIn the process of compacting, underground water is discharged by gap between casing and interior rammer cylinder, has ensured in time underground water to be discharged, and carriesThe quality of high pile body.
Meanwhile, the whole work progress of the present invention does not have cleaning process, has realized the dry operation in formation of pile, has reducedThe operation of pile, reduce construction cost, improved the efficiency of construction, prevented again accumulation due to the water shadow to perfusion simultaneouslyRing, improve the quality of pile body.
The present invention has formed enlarged footing in the bottom in stake hole by aggregate, has greatly improved the bearing capacity of pile body, processExperiment, under same case, the present invention has improved more than 20% than the pile body bearing capacity of prior art.
The present invention also improves mattress layer, has improved the quality of mattress layer.
Brief description of the drawings
Fig. 1 is process schematic representation of the present invention;
Mark in figure: 1, hammer ram, 2, interior rammer cylinder, 3, casing, 4, end cap, 5, end cap, 6, aggregate.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, and described embodiment is only a part of the present inventionEmbodiment is not whole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the art is not makingOther embodiment used that obtain under creative work prerequisite, belong to protection scope of the present invention.
Spiral pore-forming rams a construction method that expands CFG stake, it is characterized in that, comprises the following steps:
(1), fixed pile: the number of definite CFG stake in construction area, and the position distribution of definite CFG stake; For howDetermine the number of CFG stake and the position distribution of how to confirm CFG stake, those skilled in the art can understand and understand,This repeats no more;
(2), pore-forming: twist bit is in place, starter, auger boring is shut down after predetermined absolute altitude, extracts auger stem;
(3), casing is installed: described casing is set in a hole, and the length of described casing is not less than the degree of depth in a hole;
(4), throw and expand end aggregate; Aggregate is rubble, cobble or builds slag, and the particle diameter of described aggregate is at 10-20cm;
(5), ram cylinder in installing and hammer ram tamp the expansion end at the bottom of to hole, stake hole: described interior rammer jacket casing is located in casing, instituteState between interior rammer cylinder and casing and there is the gap for draining; The described interior inside of ramming cylinder is provided with hammer ram, described interior length of ramming cylinderDegree is greater than the length of casing; The described interior upper end of ramming cylinder is connected with lifting device; In driving, lifting device rams cylinder at the bottom of hole, stake holeTamp, at the bottom of casing being sunk to a hole, hole and by the underground water in stake hole, between casing and interior rammer cylinder, squeeze out simultaneously;As the preferred mode of the present invention's one, rammer carries out before expanding dropping into expansion end aggregate after undisturbed soil compacting again;
(6), at the bottom of hole, compacting pile hole and form enlarged footing at the bottom of hole: promote interior the rammers cylinder that contains hammer ram, by lifting device elder generationCompacting at the bottom of hole, stake hole is dropped into aggregate again tamps and forms enlarged footing at the bottom of hole;
(7), throw in compound, interior the rammers cylinder that contains weight is lifted out outside a hole, in stake hole, build prefabricated mixingClose material;
(8), vibration compacting: by inserting vibrating head by compound vibration compacting, until build to predetermined absolute altitude, vibratingIn closely knit process, promote casing simultaneously, thereby ensure pile quality and do not have the problem of undergauge.
Spiral pore-forming of the present invention rams the construction method that expands CFG stake, and in the process of construction, casing is always right in stake holeThe effect of retaining wall is played in stake hole, prevents and changes the undergauge problem causing because of earth formation. The present invention is at the bottom of to hole, stake holeIn the process of compacting, underground water is discharged by gap between casing and interior rammer cylinder, has ensured in time underground water to be discharged, and carriesThe quality of high pile body.
Meanwhile, the whole work progress of the present invention does not have cleaning process, has realized the dry operation in formation of pile, has reducedThe operation of pile, reduce construction cost, improved the efficiency of construction, prevented again accumulation due to the water shadow to perfusion simultaneouslyRing, improve the quality of pile body. Because the interior water in stake hole can impact the concrete configuring according to technological requirement, therefore, thisInvention is tamped and forms in the process of enlarged footing at the bottom of to hole, stake hole, and underground water can both be discharged by the form of extruding, fromAnd eliminated the impact of underground water on perfusion, improve the quality of pile body.
The present invention has formed enlarged footing in the bottom in stake hole by aggregate, has greatly improved the bearing capacity of pile body, processExperiment, under same case, the present invention has improved more than 20% than the pile body bearing capacity of prior art. Application number isAlthough the patent of 201310470424.X provides a kind of and reinforces the dumb-bell shape drilled pile composite foundation structure of the soft base of embankment and executeWork method, first enlarged diameter section starts to downward-extension certain depth from embankment lower end, and second enlarged diameter section is positioned at a low sideHard stratum in, thereby improve the bearing capacity of pile body, but the not further open structural requirement to pile body of this patentFurther open, and construction method is mainly boring, because the stake bottom point of pile body is greater than pile body diameter, in fact by boringIt is very large that difficulty is implemented in hole, or need special equipment just can complete, and causes construction cost high.
And the present invention is by containing interior cylinder and the structural design of casing of ramming of hammer ram, the row that can either realize underground waterGo out, simultaneously can form enlarged footing in the bottom in stake hole again, have simple in structurely, the feature of easy construction, greatly reduces and executesThe cost of work has improved the bearing capacity of pile body simultaneously. Be not apparent for a person skilled in the art, possessCreative.
For the ease of operation with use, for the ease of sinking casing 3 and extract casing 3, establish on the upper top of described casing 3Be equipped with end cap 4, meanwhile, the interior upper top of ramming cylinder 2 of the present invention is provided with and end cap 4 end cap 5 of adaptation mutually, even if end cap 5Be connected with outside lifting device in interior rammer cylinder, also can, by the spacing between end cap 5 and end cap 4, in judgement, ram cylinder 2 simultaneouslyThe distance of sinking. Simultaneously the interior cylinder 2 that rams of the present invention is in the process of compacting, by contacting of end cap 5 and end cap 4, can will protectIn cylinder 3 jacked pile holes, minimizing, separately by the operation in casing 3 jacked pile holes, is increased work efficiency.
Complete after pile body cast, in the upper end of pile body, mattress layer is set.

Claims (3)

1. spiral pore-forming rams a construction method that expands CFG stake, it is characterized in that, comprises the following steps:
(1), fixed pile: the number of definite CFG stake in construction area, and the position distribution of definite CFG stake;
(2), pore-forming: twist bit is in place, starter, auger boring is shut down after predetermined absolute altitude, extracts auger stem;
(3), casing is installed: described casing is set in a hole, and the length of described casing is not less than the degree of depth in a hole;
(4), throw and expand end aggregate;
(5), ram cylinder in installing and hammer ram tamp the expansion end at the bottom of to hole, stake hole: described interior rammer jacket casing is located in casing, described inRam between cylinder and casing and there is the gap for draining; The described interior inside of ramming cylinder is provided with hammer ram, and the length of described interior rammer cylinder is largeIn the length of casing; The described interior upper end of ramming cylinder is connected with lifting device; In driving, lifting device rams cylinder to carrying out at the bottom of hole, stake holeCompacting squeezes out at the bottom of casing being sunk to a hole, hole and by the underground water in stake hole simultaneously between casing and interior rammer cylinder;
(6), at the bottom of hole, compacting pile hole and form enlarged footing at the bottom of hole: promote interior rammers tin that contains hammer ram, by lifting device first to stakeAt the bottom of hole, hole, compacting drops into aggregate again and tamps and form enlarged footing at the bottom of hole;
(7), throw in compound: the interior rammer cylinder that contains hammer ram is lifted out outside a hole, in stake hole, builds prefabricated compound;
(8), vibration compacting: by inserting vibrating head by compound vibration compacting, until build to predetermined absolute altitude, at vibration compactingProcess in promote casing simultaneously.
2. spiral pore-forming according to claim 1 rams the construction method that expands CFG stake, it is characterized in that, described aggregate is brokenStone, cobble or build slag, the particle diameter of described aggregate is at 10-20cm.
3. spiral pore-forming according to claim 1 rams the construction method that expands CFG stake, it is characterized in that described casing upperTop is provided with end cap, and the described interior upper top of ramming cylinder is provided with and the end cap end cap of adaptation mutually.
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CN106677169B (en) * 2017-01-17 2019-05-31 陕西隆极机械设备有限公司 It is adapted to the squeezed screw thread pile construction method that spins of severe cold weather
CN107975058A (en) * 2017-10-12 2018-05-01 川户嗣成 A kind of special base expanding and base expanding engineering method of EST full-sleeves
CN112726576A (en) * 2020-12-21 2021-04-30 马鞍山蒹葭电子科技有限公司 Foundation pit protection template for pile foundation pouring and construction method thereof

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