CN109680695A - Bore forming technique is perfused in anhydrous thickness sand cobble stratum long auger - Google Patents

Bore forming technique is perfused in anhydrous thickness sand cobble stratum long auger Download PDF

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Publication number
CN109680695A
CN109680695A CN201811544771.1A CN201811544771A CN109680695A CN 109680695 A CN109680695 A CN 109680695A CN 201811544771 A CN201811544771 A CN 201811544771A CN 109680695 A CN109680695 A CN 109680695A
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CN
China
Prior art keywords
mud
concrete
pile
slope protection
long
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CN201811544771.1A
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Chinese (zh)
Inventor
何世鸣
李江
田震远
张宝和
周与诚
郁河坤
司呈庆
陈辉
贾城
李长生
王建明
黄鑫峰
洪伟
王海宁
刘志刚
杜高恒
郭跃龙
陈鹏
Original Assignee
北京建材地质工程有限公司
中材地质工程勘查研究院有限公司
北京城建科技促进会
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Priority to CN201811544771.1A priority Critical patent/CN109680695A/en
Publication of CN109680695A publication Critical patent/CN109680695A/en

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/20Securing of slopes or inclines
    • E02D17/207Securing of slopes or inclines with means incorporating sheet piles or piles
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/10Deep foundations
    • E02D27/12Pile foundations
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/36Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds

Abstract

A kind of anhydrous thick sand cobble stratum long auger perfusion bore forming technique, using long-spiral drilling machine pore-forming;Mud is full of in hole;Steel reinforcement cage is hung in into designed elevation, segmentation is in aperture welding or straight screw connection when steel reinforcement cage is too long;Tremie concrete pile is used afterwards;Or descending reinforcing cage does not form plain concrete pile, using as composite foundation.The invention has the advantages that efficiently utilizing the ability of high-power large torque long-spiral drilling machine drilling, speed of fulfiling hole is fast, can achieve 5 ~ 10 times of positive and negative circulation impact drilling machine, folk prescription cost is substantially suitable;It is 2 ~ 3 times of rotary drilling rig, and cost is the half of rotary drilling rig, it solves and inserts the impracticable problem of steel reinforcement cage technique after long spire pore-forming guncreting caused by absorbing water too fast and concrete supply not in time because of special formation, construction is set to become reliable, speed of application greatly improves, quality is guaranteed, and cost is greatly reduced.Environmental protection and saving, it is shown that its great superiority.

Description

Bore forming technique is perfused in anhydrous thickness sand cobble stratum long auger
Technical field
The present invention relates to a kind of long spires into pore pressure mud grouting conduit subaqueous concreting pile-formation process, belongs to building ground Bore forming work is perfused in pile-formation process in base foundation construction, specifically a kind of anhydrous thick sand cobble stratum long auger Skill.It can be used for composite foundation pile, it can also be used to the construction of compressive pile, uplift pile or slope protection pile etc..
Background technique
It is both at home and abroad at present the anhydrous thick sand-pebble layer bored concrete pile of implementation, either compound foundation pile or compressive pile or resistance to plucking Stake or slope protection pile are currently using mechanically or manually dry hole operation if the closely knit not collapse hole in stratum.For collapse hole situation, generally Using traditional positive and negative circulation and impact drill mud off or rotary digging mud static state retaining wall, pore-forming rear tube underwater grouting coagulation Native pile.The basic defect of this pile mode is inefficiency, at high cost, long in time limit;There are also vibration and noises to ask for impact drill Topic, as rotary drilling digger unload soil sound disturb residents it is very serious.Using long spire pore-forming guncreting at plain stake, or reinforcing bar is inserted afterwards Cage is at reinforced concrete pile technique, high-efficient, at low cost, short time limit, is good method, but the puzzlement by stratum, greatly Slump coagulation soil pressure is poured into the anhydrous thick sand cobble stratum, dehydration can dry out quickly, steel reinforcement cage is caused to be inserted not on earth, or It inserts less than projected depth.Sometimes by the restriction of concrete supply, by taking Beijing as an example, early 7:00 ~ 9:00 is the traffic morning peak phase, 17:00 ~ 19:00 in afternoon is the traffic evening peak phase, and concrete tank is not allow road, that is to say, that this period mixes Solidifying soil cannot be without interruption, and countermeasure is to deposit before early 7:00 and at the scene two tank concrete before 17:00 in afternoon, does so Consequence is to ensure that this period drilling machine cannot be out of order, once being out of order, several hours can't be fixed, this two tank Concrete is just very likely scrapped, and cost is increased;What is more, and some 16:00 ~ 21:00 in mixing plant afternoon cannot dispatch a car, this Just implement the technique can not.For this purpose, seek it is a kind of can efficiently safe process just becomes very must again It wants.
Summary of the invention
To solve the above-mentioned problems, the invention proposes a kind of efficient and practical use long-spiral drilling machine drilling & grouting piling mud The underwater tremie concrete pile-formation process of steel reinforcement cage is hung in after underwater tremie concrete or pressure mud grouting after slurry.
The technical scheme is that bore forming technique is perfused in a kind of anhydrous thick sand cobble stratum long auger, Characterized by comprising the following steps:
(1) long-spiral drilling machine pore-forming is used;
(2) it is full of mud in hole, starts mud off when creeping into when collapse hole is serious;
(3) steel reinforcement cage is hung in into designed elevation, segmentation is in aperture welding or straight screw connection when steel reinforcement cage is too long;
(4) tremie concrete pile is used afterwards;Or descending reinforcing cage, concrete perfusion do not form plain concrete pile, as again Close ground.
A kind of slope protection formed using the anhydrous thick sand cobble stratum long auger perfusion bore forming technique Stake and its supporting construction, the slope wall including row's slope protection pile composition, which is characterized in that be equipped on the top of the slope protection pile Crown beam is equipped with the wall that bankets back to the side of foundation pit in the slope protection pile, is successively equipped at intervals with from top to bottom in the slope protection pile upper half First of anchor pole, second anchor pole and third road anchor pole, the anchor head component of this three anchor pole are located at the slope protection pile in face of foundation pit Side, the tail end of anchor pole are passed through to banket diagonally downward and wall and be protruded into ground.
The anchor head component includes including bearing plate, anchor head, I-steel, taper liner block and resistant slide reinforcing bar, anchor head, pressure-bearing The centre bore of plate, I-steel and taper liner block sequentially passes through anchor pole, and anchor head is located at the top of anchor pole;Bottom edge and shield in the taper liner block Resistant slide reinforcing bar is supported between the stake of slope.
The wall that bankets by being sequentially filled cobble, Extra-fine sand, clay, cobble, Extra-fine sand, clay silt from bottom to up With sandy silt, plain fill;It is equipped with retaining wall on the top of the slope protection pile, is equipped with waterwall on the top of the retaining wall.
The invention has the advantages that efficiently utilizing the ability of high-power large torque long-spiral drilling machine drilling, speed of fulfiling hole Fastly, 5 ~ 10 times of positive and negative circulation impact drilling machine be can achieve, folk prescription cost is substantially suitable;It is 2 ~ 3 times of rotary drilling rig, and cost The only half of rotary drilling rig, thus have apparent speed and economic benefit advantage.It solves because special formation water suction is too fast And concrete supply causes the slotting impracticable problem of steel reinforcement cage technique after long spire pore-forming guncreting not in time, makes to construct Become reliable, speed of application greatly improves, and quality reaches guarantee, and cost is greatly reduced.Environmental protection and saving, it is shown that it is greatly excellent More property.
Detailed description of the invention
Fig. 1 is process flow chart of the invention;
Fig. 2 is drilling sequences of the invention (jumping three against one) explanatory diagram;
Fig. 3 is the foundation pit of the embodiment of the present invention and the pile-anchor retaining plan view on periphery;
Fig. 4 is F direction view (part) in Fig. 3;
Fig. 5 is that (E-E of Fig. 3 rotates clockwise 90 ° of section view for the north side slope protection pile supporting construction cross-sectional view of the embodiment of the present invention Figure);
Fig. 6 is the enlarged drawing in Fig. 5 at P;
Description of symbols: 1- crown beam, 2-370 retaining wall, 3- waterwall, 4- plain fill, 5- clay silt and sandy silt, 6- Extra-fine sand, 7- cobble, 8- clay, 9- Extra-fine sand, 10- cobble, first of anchor pole of 11-, 12- second anchor pole, 13- third road anchor Bar, 14- slope protection pile, 15- closing foundation ditch building basis, 16- bearing plate, 17- anchor head, 18- I-steel, 19- taper liner block (angle board) , 20- resistant slide reinforcing bar, 21- proposed object is a- long (containing retaining wall 2 and waterwall 3, total high 24.6m), b- retaining wall height (1.5m), c- crown beam height (0.7m), d- crown beam bottom to first of anchor pole distance (1.8m), first of anchor pole of e- and second anchor Bar distance (4m), f- second anchor pole and third road anchor pole distance (4m), the distance (4.05m) of g- third road anchor pole to slot bottom, H- anchorage lengths (8.55m), A, slope protection pile stake position (stake holes), B, foundation pit are suitable for reading, mouth under C, foundation pit, D, raft edges of boards line.
Specific embodiment
Typical process flow of the invention is as depicted in figs. 1 and 2, comprising the following steps:
1, surveying setting-out fixed pile: carrying out " three supplies and one leveling " for construction site, then the surveying setting-out fixed pile on smooth location, Guide pile is carried out with measuring instrument in both ends, prevents stake position from checking at any time when there is deviation;Fixed pile is usually to use drill rod or punching Device makes a call to a depth hole 30cm on the ground, pours into albarium powder, the distinguishing marks such as reinforcing rod are plugged at stake position.
2, drilling machine drills in place: being leveled respectively from two sides to drilling machine using two-wire hammer method, it is horizontal to guarantee drilling machine, while by boring The adjustment of machine self-levelling systems guarantees the perpendicularity deviation of drilling tool within the scope of 0.5%.It can be taken depending on soil layer and local environmental conditions Drilling or " jump is beaten " (hole or multiple holes can be jumped) in turn.Aforementioned slope protection pile example, " jumping three against one ", i.e., every three stakes A stake holes is made a call in position, as shown in Figure 2: solid arrow is first round punching sequence in figure, and dotted line is the second wheel punching sequence.
3, the preparation of concrete: mixing plant must carry out retrial, qualified rear to cement, sand, stone and the outer-penetrating agent to enter the station It can be used.Slump meets underwater grouting requirement, generally 160 ~ 180mm, and control coarse aggregate size is not more than 20mm.To meet Workability needs and industrial waste utilizes, and mixes flyash in right amount, while there are also low-grade cements to act on.
4, fabrication of reinforcing cage and aperture connection: according to design drawing screwing steel bars cage, it may not be necessary to be processed into " V " font Pile top, simple processing, efficiency improve, and for slope protection pile, anchorage length is equivalent to relatively safety.Two-section cage Son can weld in aperture or straight screw connection.
5, slurrying and maintenance: calculating is portalled interior mud volume, the stake number to be completed for one day, rate of flooding, such as existing It needs to retain always and is full of mud at least four hole in, with aforementioned 29.5m long, for diameter 800mm, at least scene will have 60m3Mud surplus, pit capacity at least will be in 80m3More than.According to simulated mud, it is stirred in mud agitator tank After be put into mud pit, after being put into mud pit, to be safeguarded, at this time be guarantee mud dispersing type and suspension, be added Caustic soda does not stop circulation stirring as dispersing agent and PH regulator, and using water pump for 24 hours, to guarantee that mud property is met the requirements. The basic recipe (volume ratio) of mud: sodium bentonite 5~6%, NaOH0.8 ~ 1%, Na-CMC0.2 ~ 0.3%, PVC0.2 ~ 0.3%, Surplus is water.And often measure its performance: viscosity, specific gravity, fluid loss, mudcake quality and thickness, gel strength, contain sand at ratio of dynamic shear force/yield value to plastic viscosity Amount, colloidity and pH value etc., to keep mud property, and keep its preferable retaining wall performance.PVC therein have moment at Film retaining wall function is conducive to protect sand cobble stratum not collapse hole.
It generally requires its performance indicator to meet to require as follows: viscosity (funnel viscosity 700/500) 20 ~ 25s, specific gravity 1.05 ~ 1.1, fluid loss is no more than 15ml/30min, mudcake thickness no more than 3mm/30min, 0.42 ~ 0.48Pa/mPas of ratio of dynamic shear force/yield value to plastic viscosity, quiet 1.5 ~ 2.5Pa of shear force, silt content are not less than 95% and pH value 14 no more than 4%, colloidity.
6, mud grouting is pressed, steel reinforcement cage is hung in: after drilling tool gets into designed elevation, being pumped into ground for the mud stirred using water pump Pump starts ground pump side pressure mud grouting, and side slowly promotes drilling tool, mud will be full of in hole, can be moved away from aperture, gives lower step construction wound Make working face.Start the mud off in drilling if collapse hole is serious, when drilling.With lifting equipment by a ready section Steel reinforcement cage is sling, and is sunk using its self weight, aperture be fixedly welded or straight screw connection under a section, taken during tripping in reliable The verticality of correcting measure guarantee cage is simultaneously placed in the middle.Absolute altitude is measured, cage reinforcing bar is made to meet the length anchored into coupling beam or bottom plate It is required that.
7, filling concrete: bottom hole will be arrived under conduit using crane, be directly perfused using concrete tank and examined qualification Concrete, filling process is continuous, encounters termination of pumping or concrete when cannot be without interruption, should be living by conduit at regular intervals Make a movement, or beat pump it is several under, avoid concrete coagulation;It fills at aperture, avoiding falling into soil and causes folder mud, and guarantee to protect stake It is long.
8, chisel pile crown anchors into coupling beam or bottom plate: after pile driving construction reaches requirement, removing inter-pile soil, chisels out protection pile crown, tie up Reinforcing bar formwork supporting plate, or construction of bottom plates is carried out after carrying out waterproof.
The main material that the present invention uses has reinforcing bar, concrete, bentonite etc..Concrete coarse aggregate partial size is not more than 20mm.It is swollen Profit soil selects sodium bentonite, and does dispersing agent and pH value adjustment agent using caustic soda.
The work progress of all slope protection piles is: after " jumping three against one " (referring to fig. 2) stake holes, as procedure described above after pile, Again in the middle position punching of " jumping three ", pile;Then punching, pile (between pile) in remaining each interval;Until Complete all slope protection piles in foundation pit periphery.Interval between adjacent two slope protection piles is about that the diameter of stake is (true according to geological condition It is fixed).
The slope protection pile made of present invention process is constructed and its supporting construction is as shown in figures 3 to 6: including row's slope protection Stake 14 composition slope walls, in the slope protection pile 14(slope wall) top be equipped with crown beam 1, in slope protection pile 14(slope wall) It is equipped with and bankets wall back to the side of foundation pit, be successively equipped at intervals with first of anchor pole 11, the from top to bottom in 1 upper half of slope protection pile Two anchor poles 12 and third road anchor pole 13, the anchor head component of this three anchor pole are located at slope protection pile 14(slope wall) in face of foundation pit Side, the tail end of anchor pole are passed through to banket diagonally downward and wall and be protruded into ground.
The anchor head component includes including bearing plate 16, anchor head 17, I-steel 18, taper liner block 19 and resistant slide reinforcing bar 20, anchor head 17, bearing plate 16, I-steel 18 and taper liner block 19 centre bore sequentially pass through anchor pole, anchor head 17 is located at the top of anchor pole End;Resistant slide reinforcing bar 20 is supported between the bottom edge and slope protection pile 14 of the taper liner block 19.
The wall that bankets is by being sequentially filled cobble 10 from bottom to up, Extra-fine sand 9, clay 8, cobble 7, Extra-fine sand 6, having glued Matter silt and sandy silt 5 and plain fill 4;In the slope protection pile 14(slope wall) top be equipped with retaining wall 2, in the earth-retaining The top of wall 2 is equipped with waterwall 3.
Engineering Projects is embodied
1, Outline on Project:
Beijing Institute of Technology Zhong Guan-cun school district Hospital transformation project is located at No. 5, Zhongguancun Road(South), Haidian District, Beijing City Beijing reason In work institution of higher education, east side is hostel, and north side is No. 2 residential buildings, No. 1 residential building, and southern side is Seeking Truth building and sports ground, and west side is Radix Polygalae building and science and engineering dining room.
Structural outer rim is having a size of 80.25m × 47.60m, and 1~3 layer on the ground, 3 layers of underground, substrate absolute altitude -15.00m~- 16.10m.± 0.00 is equivalent to absolute altitude 52.700m.
The plane of the stake position on construction site foundation pit and its periphery is as shown in Figure 2.
(1) foundation pit north side is distributed more underground utilities (heating pipeline, water-supply line, sewage pipeline) and phase shut-in valve is set It applies, north side eastern section is No. 1 residential building, and north side west section is No. 2 residential buildings.Underground utilities away from ready-built structure outer rim minimum distance about 2.40m, using direct-buried mode, buried depth is less than 2.00m;No. 16 floor of residential building ground, about away from ready-built structure outer rim minimum distance 9.70m, C10 concrete continuous footing, 50.15~49.10m of substrate absolute altitude;No. 2 residential buildings 5 floor on the ground, away from ready-built structure outside Edge minimum distance about 6.10m, C15 concrete continuous footing, substrate absolute altitude 48.80m.
(2) foundation pit east side is Polytechnics Road, hostel and dormitory.Buried pipe is buried under Polytechnics Road Line, away from ready-built structure outer rim minimum distance about 13.0m, using direct-buried mode, buried depth is less than 2.00m;Hostel and dormitory 6 layers on the ground, away from ready-built structure outer rim minimum distance about 20.00m, C20 concrete continuous footing, substrate absolute altitude 50.44m.
(3) foundation pit southern side is distributed more underground utilities (power electric, light current, heating pipeline, water-supply line, rainwater pipeline) With phase shut-in valve facility, southern side eastern section is Seeking Truth building, and southern side west section is sports ground.Underground utilities are away from ready-built structure outer rim most low coverage From about 4.00m, using direct-buried mode, buried depth is less than 2.00m;1~4 floor of Seeking Truth building ground, away from ready-built structure outer rim minimum distance About 21.50m, C20 concrete isolated footing, substrate absolute altitude 50.00m;Sports ground is just in using area, and site elevation is about 52.40m。
(4) foundation pit west side is distributed more underground utilities (power electric, light current, rainwater pipeline) and phase shut-in valve facility, west side Northern section is science and engineering dining room and integrated service building, and west side south section is Radix Polygalae building.Underground utilities away from ready-built structure outer rim minimum distance about 2.80m, using direct-buried mode, buried depth is less than 2.00m;Science and engineering dining room and integrated service building 1~2 floor on the ground, away from ready-built structure outside Edge minimum distance about 8.30m, C20 concrete continuous footing, 50.40~49.50m of substrate absolute altitude;4 floor of Radix Polygalae building ground, away from quasi- Build structural outer rim minimum distance about 7.30m, C20 concrete continuous footing, substrate absolute altitude 50.60m.
2 hydrogeological conditions
2.1 strata conditions:
Reported according to geotechnical engineering investigation, top is fill stratum, under be to rush diluvial formation in recent deposit layer, the general Quaternary Period.This Secondary exploratory hole ground elevation is between 52.33m~52.56m.Formation is from top to bottom:
1) artificial earth fill's layer:
1. clay silt plain fill: it is isabelline, based on clay silt, sandy silt, part be Extra-fine sand, containing a small amount of brick slag, Lime-ash, plant roots and stems etc..Wet, loosely, part presss from both sides 1. 1 miscellaneous fill.This layer of overall thickness is 1.20~7.20m, and layer bottom absolute altitude is 45.28~51.15m.1. 1 miscellaneous fill, variegated, wet containing brick, lime-ash, rubble etc. based on building, loosely organized, maximum thick Degree is 0.70m.
2) the general Quaternary Period rushes diluvial formation:
2. clay silt, sandy silt: it is isabelline, it is wet containing mica, iron oxide etc., it is slightly close~in close, height~mesohigh contracting, This layer presss from both sides 2. 1 silty clay, heavy silt clay lenticular body.The distribution of this layer is discontinuous, and the general thickness of exposure is 0.60~ 5.70m, layer bottom absolute altitude are 45.14~46.76m.2. 1 silty clay, heavy silt clay, isabelline, contain mica, iron oxide etc., It is wet~very wet, soft modeling~plastic, height~mesohigh contracting, maximum gauge 0.70m.
3. Extra-fine sand: it is isabelline, it is wet containing mica etc., in it is close~closely knit, this layer is with a thickness of 5.00~7.70m, layer bottom absolute altitude For 39.03~40.26m.
4. cobble: variegated, sub- round, partial size is generally 6~9cm, and maximum particle diameter is not less than 11cm, and medium coarse sand fills about 30%, it is wet~saturation, it is slightly close~in close, 6.20~7.30m of thickness, layer bottom 32.82~33.43m of absolute altitude.
5. silty clay, heavy silt clay: isabelline, wet~very wet containing mica, iron oxide etc., plastic, middle high~middle pressure Contracting, for this layer with a thickness of 1.50~2.40m, layer bottom absolute altitude is 30.75~31.83m.
6. Extra-fine sand: isabelline, containing mica etc., wet, closely knit, this layer is with a thickness of 1.90~3.60m, layer bottom absolute altitude 27.72~29.23m.
7. cobble: variegated, sub- round, partial size is generally 6~10cm, and maximum particle diameter is not less than 12cm, and medium coarse sand fills about 30%, it is wet~saturation, in it is close~closely knit.The layer is not exposed, and maximum discloses with a thickness of 11.90m.
2.2 place Groundwater buried depth condition:
1) two layers of underground water is disclosed in drilling depth range during this prospecting, first layer groundwater type is diving, water-bearing layer For 4. boulder bed, fixed level buried depth is 19.10~19.40m, and absolute altitude is 33.14~33.25m.Second layer groundwater type For diving, water-bearing layer is that 7. boulder bed, fixed level buried depth are 29.50m, absolute altitude 23.04m.
2) this place nineteen fifty-nine historical high groundwater level is once close to natural terrain, nearly 3~5 years highests groundwater level absolute altitude About 38.00m, water level year amplitude of variation about 1.00~2.00m.
3) according to underground water corrosion classsification result judgement: environmental form is this place first layer, second under the conditions of II class Layer underground water all has microcorrosion to concrete structure;This place first layer, second layer underground water under Wet/Dry Cyclic Conditions Microcorrosion is all had to the reinforcing bar in reinforced concrete structure.
4) analyze result judgement according to the lyotropic salt of soil: soil has microcorrosion to concrete structure;Soil is to reinforced concrete Reinforcing bar in soil structure has microcorrosion.
3, slope protection pile design parameter:
1) support pile stake diameter 800mm, stake spacing (center away from) 1600mm, the long 21.50~23.10m of stake, strength grade of concrete are C25。
2) it when supporting pile driving construction, is constructed using the mode of beating is jumped, the appearance for altering the rough sledding such as hole is avoided, such as obstacle Object can continue to creep into after investigating thoroughly reason.
3) supporting pile driving construction tolerance: stake position horizontal departure≤50mm, aperture tolerance ± 20mm, hole depth allow inclined Difference+300mm, verticality tolerance < 1/200, sediment thickness < 200mm.
4) main reinforcement of support pile uses HRB400 reinforcing bar, and longitudinal reinforcement use is welded or straight screw connection, between main reinforcement connector Away from 1.00m is not less than, on same section 1/2 of splice no more than sum.If reinforcing bar connection, which uses, connects weldering, single welded lap Length is not less than 10d, and double-welded lap length is not less than 5d.
5) fabrication of reinforcing cage tolerance: main reinforcement spacing ± 10mm, spiral bar screw pitch ± 20mm, steel reinforcement cage diameter ± 10mm, length of reinforcing cage ± 100mm, main reinforcement protective layer ± 20mm.
6) each steel bar cage protecting layer is no less than 4 groups, and every group is no less than 5 pieces, cover to reinforcement 50mm.
7) every equipment making 100 × 100 × 100mm test block daily is no less than one group (except condition).
8) the other items of supporting pile driving construction are held by " building foundation pit supporting technical specification " (JGJ120-2012) related requirement Row.
9) it when supporting pile driving construction, is constructed using the mode of beating is jumped, the appearance for altering the rough sledding such as hole is avoided, such as obstacle Object can continue to creep into after investigating thoroughly reason.
10) north side west section, No. 2 residential buildings of slope protection pile distance are relatively close (minimum range 3.5m) at this, and use is " every three dozens at this One " mode is constructed.
4, field conduct situation:
The difficulty for considering stratum has selected middle 220 rotary drilling rig of vehicle, starts first slope protection pile of constructing on May 16th, 2018, Due to being influenced in work progress by Environmental Safety inspection, rainy influence, the influence of strong wind blue early warning, concrete supply morning The influence of many factors such as the influence of evening peak completes 58 piles in 20 days, when normal construction is most until June 6 day and night withdraws in total It completes 6 within one day, 1 is completed within one day when minimum, averagely daily less than 3.
Long-spiral drilling machine (580) June 4 marches into the arena, and 6 start to drive piles, and is equally influenced by preceding factors, and especially by coagulation The influence of soil supply, construction is not extremely smooth, has investigated 4 mixing plants thus, and preceding 3 mixing plants can only all provide aggregate chips preparation Pea gravel concreten, only 1 mixing plant can provide peastone preparation pea gravel concrete.Tissue well may be implemented 1 completely Hour 1 speed, but problem is come, concrete cannot be guaranteed without interruption, in order to avoid early evening peak, deposit in advance at the scene Upper 2 ~ 3 tank concrete, occur twice within as a result two days pump line blocking the phenomenon that, wait dismantle section by section clear up and assemble again with Afterwards, there is the situation that slump is less than 180mm, scene is pumped in hole reluctantly after adding water and stirring, and cage but can not It inserts, even some can be only inserted into 2 meters, it is forced to pull out cage, and the long spire drilling tool of the concrete in hole is screwed out, remaining Concrete signature after retract, greatly, labor intensity of workers is also very big for waste, does not also go in progress, Party A always wraps also extremely not It is full.Large power long twist bit has great potentiality, and 1 hour 1 speed may be implemented completely, can present restraining factors lead Cause that 1 pile can only be broken within 1 day, but also waste 2 tank concrete, mixing plant is also unsatisfied with, also need individually to handle this retract it is mixed Solidifying soil.This just gives that we have proposed a urgent tasks: how the great potential of competence exertion long-spiral drilling machine, accelerate construction Can progress, little waste, worker's construction be coped with easily?
It is discussed jointly by field technician, administrative staff and master worker, the result is that long-spiral drilling machine punches by all means, later By mud fill can, vacate working face, crane hangs in steel reinforcement cage and underwater tremie concrete, certainly fast, and coagulation Soil come earlier also it doesn't matter a little later, loss of slump a little it doesn't matter, as long as being able to satisfy underwater grouting.Mud Pond is sufficiently large.The basic recipe (volume ratio) of mud: sodium bentonite 6%, NaOH1%, NaCMC0.3%, PVC0.3%, surplus For water.Mud property should meet following performance:
Viscosity (funnel viscosity 700/500) 23s, specific gravity 1.09, fluid loss are not more than 3 no more than 10ml/30min, mudcake thickness Mm/30min, ratio of dynamic shear force/yield value to plastic viscosity 0.48PA/mPas, gel strength 2.0Pa, silt content are not less than 95% and pH value no more than 4%, colloidity 14。
It is had also appeared in long-spiral drilling machine work progress since the underground big resistance of cobble partial size is big, is showed what drilling rod fractureed As the drilling rod can not take out, use after processing as a pile, exclusively carried out horizontal displacement, vertical displacement, bolt shaft The project monitorings such as power, deeply mixing cement-soil pile, final result is highly desirable, maximum horizontal displacement only has 3mm, effective protection Zhou Bianmin The safety such as residence, office building and pipeline.
Speed of application of the present invention and economic benefit are apparent.Such as Beijing foundation pit slope protection stake engineering, it is located at Beijing In city's tricyclic, mixing plant concrete supply is extremely difficult, closes on residential building, requires the limitation of slope protection pile Construction Vibration noise tight Lattice.Stake diameter 800mm, the long 29.5m of stake, complete 3 piles in clean-out machine one day for 24 hours, and mud amount is big, and percussive drill is due to vibration And noise, construction time are limited, one day achievable 2 pile, rotary drilling rig also due to drilling bucket unloads native noise, the construction time also by Limitation, early 6:00 ~ 22:00 can complete 5~6 piles for one day, and long-spiral drilling machine (model 580) one hour achievable 1, it can It was constructed with 24 hours, considers the non-cutting time of construction teams and groups, one day achievable 16 ~ 20 pile.

Claims (10)

1. bore forming technique is perfused in a kind of anhydrous thick sand cobble stratum long auger, which is characterized in that including following step It is rapid:
Using long-spiral drilling machine pore-forming;
It is full of mud in hole, starts mud off when creeping into when collapse hole is serious;
Steel reinforcement cage is hung in into designed elevation, segmentation is in aperture welding or straight screw connection when steel reinforcement cage is too long;
Tremie concrete pile is used afterwards;Or not descending reinforcing cage, concrete perfusion forms plain concrete pile, as compoundly Base.
2. bore forming technique, feature is perfused in anhydrous thick sand cobble stratum long auger according to claim 1 It is, the ingredient and volume ratio of the mud are as follows: sodium bentonite 5~6%, NaOH0.8 ~ 1%, Na-CMC0.2 ~ 0.3%, PVC0.2 ~ 0.3%, surplus are water;And often measure its performance, comprising: viscosity, specific gravity, fluid loss, mudcake quality and thickness move Ratio, gel strength, silt content, colloidity and pH value are moulded, to keep mud property, and keeps its preferable retaining wall performance;Wherein PVC have the function of moment form a film retaining wall, be conducive to protect sand cobble stratum not collapse hole.
3. bore forming technique, feature is perfused in anhydrous thick sand cobble stratum long auger according to claim 2 It is, the performance indicator of the mud meets following require: 20 ~ 25s of funnel viscosity, specific gravity 1.05 ~ 1.1, fluid loss are not more than 15ml/30min, mudcake thickness are not more than 3mm/30min, 0.42 ~ 0.48Pa/mPas of ratio of dynamic shear force/yield value to plastic viscosity, 1.5 ~ 2.5Pa of gel strength, contain Sand amount volume ratio is not less than 95% and pH value 14 no more than 4%, colloidity volume ratio.
4. bore forming technique, feature is perfused in anhydrous thick sand cobble stratum long auger according to claim 2 It is, the preparation of the mud and maintaining method: according to the mud basic recipe, each material is stirred in mud agitator tank It is put into mud pit after mixing, after being put into mud pit, is safeguarded, be at this time the dispersing type and suspension that guarantee mud, add Enter caustic soda as dispersing agent and PH regulator;And do not stop circulation stirring for 24 hours using water pump, to guarantee that mud property is met the requirements.
5. bore forming technique, feature is perfused in anhydrous thick sand cobble stratum long auger according to claim 1 It is, in the step (2): after drilling tool gets into designed elevation, the mud stirred being pumped into ground pump using water pump, starts ground pump Mud grouting is pressed on side, and side slowly promotes drilling tool, mud will be full of in hole, can be moved away from aperture, creates working face to the construction of lower step;Such as Fruit collapse hole is serious, starts the mud off in drilling when drilling.
6. bore forming technique, feature is perfused in anhydrous thick sand cobble stratum long auger according to claim 1 It is, in the step (3): slinging ready section steel reinforcement cage with lifting equipment, sunk using its self weight, aperture is solid A section under fixed welding or straight screw connection takes reliable correcting measure to guarantee verticality and the residence of steel reinforcement cage during tripping in In;Absolute altitude is measured, steel reinforcement cage is made to meet the length requirement anchored into coupling beam or bottom plate.
7. bore forming technique, feature is perfused in anhydrous thick sand cobble stratum long auger according to claim 1 It is, the filling concrete method in the step (4): bottom hole will be arrived under conduit using crane, it is straight using concrete tank It connects perfusion and has examined qualified concrete, filling process is continuous, encounters termination of pumping or concrete when cannot be without interruption, should be every A period of time by conduit activity once, or beat pump it is several under, avoid concrete coagulation;It fills at aperture, avoiding falling into soil and causes Mud is pressed from both sides, and guarantees to protect stake long.
8. a kind of formed using anhydrous thick sand cobble stratum long auger perfusion bore forming technique described in claim 1 Slope protection pile and its supporting construction, including row's slope protection pile (14) composition slope wall, which is characterized in that in the slope protection pile (14) top is equipped with crown beam (1), the wall that bankets is equipped with back to the side of foundation pit in the slope protection pile (14), in the slope protection pile (1) Half portion is successively equipped at intervals with first of anchor pole (11), second anchor pole (12) and third road anchor pole (13) from top to bottom, this three The anchor head component of anchor pole is located at the side that the slope protection pile (14) faces foundation pit, and the tail end of anchor pole, which passes through to banket diagonally downward, wall and to be stretched Enter in ground.
9. slope protection pile according to claim 8 and its supporting construction, which is characterized in that the anchor head component includes Bearing plate (16), anchor head (17), I-steel (18), taper liner block (19) and resistant slide reinforcing bar (20), anchor head (17), bearing plate (16), the centre bore of I-steel (18) and taper liner block (19) sequentially passes through anchor pole, and anchor head (17) is located at the top of anchor pole;It is oblique at this Resistant slide reinforcing bar (20) are supported between the bottom edge and slope protection pile (14) of cushion block (19).
10. slope protection pile according to claim 8 and its supporting construction, which is characterized in that it is described banket wall by from down toward On be sequentially filled cobble (10), Extra-fine sand (9), clay (8), cobble (7), Extra-fine sand (6), clay silt and sandy silt (5) and plain fill (4);Retaining wall (2) are equipped on the top of the slope protection pile (14), are equipped on the top of the retaining wall (2) Waterwall (3).
CN201811544771.1A 2018-12-17 2018-12-17 Bore forming technique is perfused in anhydrous thickness sand cobble stratum long auger CN109680695A (en)

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