CN102979095A - Method for constructing triaxial cement-soil mixing piles in ultra-hard soil layer - Google Patents
Method for constructing triaxial cement-soil mixing piles in ultra-hard soil layer Download PDFInfo
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- CN102979095A CN102979095A CN2012105323166A CN201210532316A CN102979095A CN 102979095 A CN102979095 A CN 102979095A CN 2012105323166 A CN2012105323166 A CN 2012105323166A CN 201210532316 A CN201210532316 A CN 201210532316A CN 102979095 A CN102979095 A CN 102979095A
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Abstract
The invention brings forward a method for constructing triaxial cement-soil mixing piles in an ultra-hard soil layer. The method is characterized in that: a single-shaft drill with a high-power power head is adopted to drill guide holes to crush decomposed rocks or the gravel soil layer; triaxial cement-soil mixing pile construction is then carried out, i.e., cement paste is poured in, and the cement paste and decomposed rock or gravel soil layer rubbles are tightly bonded to form the triaxial cement-soil mixing piles. The high-efficiency, high-quality construction of a triaxial mixing wall in the ultra-hard soil layer is realized. The construction speed is increased, the construction cost is reduced, reinforced concrete is saved, and the triaxial mixing wall can substitute for the function of an underground continuous reinforced concrete wall.
Description
Technical field
The present invention relates to the Geotechnical Engineering field, concrete relate to a kind of job practices of in superhard soil layer, carrying out three kinds of mixing pile constructions.
Background technology
Three axle agitation piles are to bore pick with three axial certain depths, spray simultaneously repeatedly mix and blend of cement paste and foundation soil at the drill bit place, between each construction cell, then take overlapping lapping construction, then before not tying firmly, inserts the cement-soil mixture H shaped steel or steel plate as its stress reinforcing material, hard to the cement knot, just formation has some strength and rigidity, continuous whole, jointless underground wall body together.
But for superhard stratum, or be mixed with the stratum of gravel, hardness is too large, has obstacle, is difficult to form continuous three axle agitation piles and is difficult to construction and forms continuous underground wall body.
Summary of the invention
The objective of the invention is to overcome the three axle agitation pile defectives that in superhard soil layer, are difficult to construct that exist in the prior art, a kind of superhard soil layer triaxial cement mixing pile job practices is provided.
The present invention is that the technical scheme that its technical problem of solution adopts is:
Superhard soil layer triaxial cement mixing pile job practices is characterized in that, adopts first the single shaft drilling tool of high power unit head to draw the hole decomposed rock or cobble soil layer are blended, and the decomposed rock that blends or cobble soil layer fragment are less than 25cm; And then carry out triaxial cement mixing pile construction and inject cement grout, cement grout and decomposed rock or the cobble soil layer fragment formation triaxial cement mixing pile of combining closely.
Adopt the single shaft drilling tool of 2 * 90kw or 2 * 110kw unit head that decomposed rock or cobble soil layer are blended, carry out again triaxial cement mixing pile construction injection and contain bentonitic cement grout.
In drawing decomposed rock that the hole blends or cobble soil layer fragment, add and bury or sand, then carry out the triaxial cement mixing pile construction.
The cement mixing method cement mixing content that is consisted of by decomposed rock or cobble soil layer and cement grout＞20%.
Triaxial cement mixing pile construction hoisting speed＜50cm/min, triaxial cement mixing pile construction back and forth whitewashing is decided spray to decomposed rock or cobble soil layer part more than twice.
The described hole of drawing is that the hole is drawn at the interval.The interval is drawn the hole and is referred to, and the agitation pile that need to draw the hole is the interval, and the quantity at interval is the gap of one or more agitation piles, and the agitation pile that does not need to draw the hole relies on mixing pile machine to carry out soil layer and blends.
The described hole of drawing is for all drawing the hole.All draw the hole and refer to, all continuous agitation piles all need to draw the hole, and all agitation piles are drawn first the hole, then carry out three axle mixing pile constructions, to alleviate the resistance of mixing pile construction, make smoothly lower boring of mixing pile construction facility.
Described cover is played construction, and No. three stakes that are last unit overlap with a stake of a rear unit or mutually overlap.
Described superhard soil layer is that hardness N value is that 100 hit〉N〉30 hit.
The invention has the advantages that, realized the construction efficient in superhard soil layer, that high-quality three axles stir body of wall.Improve speed of application, reduced construction cost, saved concrete consumption, can replace the effect of underground continuous reinforced concrete wall.
Description of drawings
Fig. 1 a kind of embodiment of the present invention draws hole sequence of construction schematic diagram.
Fig. 2 a kind of embodiment of the present invention all draws hole sequence of construction schematic diagram.
Fig. 3 is the described a kind of embodiment three axle mixing pile construction precedence diagrams of invention.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with diagram and specific embodiment, further set forth the present invention.
General hits with overlying strata greater than 30 for the N value, or is mixed with the stratum of gravel, can adopt pre-drawing bore method construction guide hole, then does manual work according to cover and plants, and forming continuously, super dark SMW engineering method cement-soil three axles stir continuous body of wall.
(1) removes obstacles, convinces by patient analysis groove
Abide by the size positions that drawing is formulated, adopt at the construction field (site) J2-2 type transit and AL322 type level gauge to carry out the axis pilot measurement.Adopt excavators excavation construction groove, groove width is 1500mm, and the degree of depth is 800mm.Run into when underground obstacle is arranged, utilize excavator to remove, the excessive cavity of rear generation of removing obstacles needs the compacting of backfill clay, again excavates groove.
(2) place guide rail or normal control wire is set
Pilot hole arranged outside normal control wire, and set each pilot hole construction marker.
(3) single shaft rig location
The position of fine setting stake machine, corresponding with construction marker when guided way, when determining construction direction, pile frame is in place.
(4) counter-rotating promotes and stirs
After the full spiral drilling machine of single shaft reached the pilot hole projected depth, counter-rotating promotes stirred.
(5) rig displacement
After the pilot hole construction is complete, be displaced to next position, hole construction.Behind one section work plane of pilot hole construction, smooth boring, three axle mixing pile machines are prepared construction.
Preboring pilot hole sequence of construction:
During this engineering three axle mixing pile construction, draw first hole construction, after adopting high-power three axle mixing pile machine single shaft band water to creep into to draw the hole, the three axle agitation piles of constructing again.Pilot hole sequence of construction, arrangement diagram and three axle mixing pile constructions order are such as Fig. 1, Fig. 2 and shown in Figure 3.
Drawing the hole described in Fig. 1 is that the hole is drawn at the interval.The interval is drawn the hole and is referred to, and the agitation pile that need to draw the hole is the interval, and the quantity at interval is the gap of one or more agitation piles, and the agitation pile that does not need to draw the hole relies on mixing pile machine to carry out soil layer and blends.
Draw the hole described in Fig. 2 for all drawing the hole.All draw the hole and refer to, all continuous agitation piles all need to draw the hole, and all agitation piles are drawn first the hole, then carry out three axle mixing pile constructions, to alleviate the resistance of mixing pile construction, make smoothly lower boring of mixing pile construction facility.
Draw in the mode of hole at interval described in Fig. 3, three axle agitation piles with draw the hole sequential schematic, black shade is partly for drawing the agitation pile hole in hole, and 1,2,3 ... be the mixing pile construction position, can find out and adopt the construction of three axle agitation pile facility, it is complete that the wherein diaxon of three axles has been drawn the hole, only has an axle to rely on three axle agitation pile facility power drills to advance.Three axles construction power is abundant, and pile-forming effect is good.
Adopt first three axle mixing pile machines to draw the hole construction in former design stake position, draw hole depth greater than designing pile length 10cm, guarantee the postorder three axle agitation piles degree of depth that can meet design requirement.When drawing the hole construction, the above scope of 4000mm at the bottom of aperture to the hole, the employing clear water creeps into, in above 4000mm scope at the bottom of the hole, adopt 5% bentonite slurry (water/binder ratio 1.0) to creep into, pore-forming is at the bottom of the hole behind the absolute altitude, surely sprayed bentonite slurry 3 minutes, pore-forming can carry out three axle mixing pile constructions after 2～3 hours, strictly controlled to draw under the hole and bored verticality, guaranteed postorder three axle agitation pile verticality.
In drawing decomposed rock that the hole blends or cobble soil layer fragment, add and bury or sand, then carry out the triaxial cement mixing pile construction.Add and bury or sand, can increase the pile-forming effect of agitation pile, cement-soil can better wrap up decomposed rock or cobble soil layer fragment behind the pile.
For better parcel decomposed rock or cobble soil layer fragment, can in cement grout, mix 5% swell soil and carry out the construction of three axles.
Three axle mixing pile construction technical requirementss
(1) this engineering space enclosing structure adopts
The triaxial cement mixing pile cover breaks into diaphragm wall as water-stop curtain.
(2) gunite material of cement mixing method adopts P.0.42.5 level Portland cement slurry, in the long scope of stake in middle weathered rock formation or the above 2m of gentle breeze rock stratum end face and middle weathered rock formation or gentle breeze rock stratum, namely in the above 4000mm scope in the stake end, cement mixing content is by 40% whitewashing, all the other position cement mixing contents are by 20% whitewashing, and the water/binder ratio of slurries is 1.5.
(3) cement mixing method adopts
Three axle agitation pile equipment construct, agitation pile should adopt the construction of socket one hole method, must accomplish that in the pile body scope cement mixing is even.
(4) for the unfavorable geology that affects the agitation pile pile quality and underground obstacle, carry out again mixing pile construction after being processed in advance;
Should keep the vertical of a level on machine chassis and guide pillar frame during (5) three axle mixing pile construction, should make a machine correctly in place before the pile, and verification stake machine guide pillar frame perpendicularity deviation is less than 1/200.
(6) triaxial cement mixing pile stirs to remain a constant speed and descends and at the uniform velocity lifting.Should not make generation negative pressure in the hole when stirring lifting and cause peripheral foundation settlement, (stake is long to be determined by the following 2.0m of hole end absolute altitude according to the long definite principle of stake simultaneously, and according to the thickness of weathered rock formation, stirring drill bit with three axles enters middle weathered rock formation 2.0m or carries out gentle breeze rock stratum 1m control), see design for details, now according to geological conditions, the speed of application value of specifically selecting sees the following form:
(7) the slurries pump discharge should be complementary with whitewashing stirring subsidence velocity or the hoisting velocity of three axle mixers, guarantees the uniformity of cement parameter in the agitation pile.Starch as stopping for some reason during construction, should be with again grouting stirring construction behind deep mixer lifting or the sinking 0.5m, to guarantee the continuity of agitation pile before recovering mud jacking.
(8) the pile body perpendicularity deviation is not more than 1/200, and pile position deviation is not more than 500mm, and the dark deviation of stake is not more than 50mm, and the expanded diameter deviation is not more than 10mm.
(9) position of triaxial cement mixing pile is determined in depth index.
(10) use traffic meter metering and the control of flow that is used for whitewashing.
Cement grout and slurries inject
1, lay at the construction field (site) cement paste stirring system (automatic mixing plant), near arrangement cementing tank carries out the system of stirring of cement grout on request before start.Send in the pulp storing barrel cement paste for preparing for subsequent use.
2, after cement paste prepared, must not surpass 2 hours dead time, and the adjacent mixing pile construction interval of lapping construction must not surpass 12 hours (initial setting time).Mix injection with breeches joint from the H mouth by 2 pipelines of 2 grouting pumps during slip casting.Grouting pressure: 0.8～1.0MPa, every pump 1-3 shelves flow 90L/min, every pump 2-4 shelves flow 145L/min.Agitation pile is with simultaneously slip casting of double end, and the triaxial cement mixing pile cement mixing content is 20%, water/binder ratio 1.5.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not subjected to the restriction of above-mentioned example; that describes in above-mentioned example and the manual just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (7)
1. superhard soil layer triaxial cement mixing pile job practices is characterized in that, adopts first the single shaft drilling tool of high power unit head to draw the hole decomposed rock or cobble soil layer are blended, and the decomposed rock that blends or cobble soil layer fragment are less than 25cm; And then carry out triaxial cement mixing pile construction and inject cement grout, cement grout and decomposed rock or the cobble soil layer fragment formation triaxial cement mixing pile of combining closely.
2. superhard soil layer triaxial cement mixing pile job practices according to claim 1, it is characterized in that, adopt the single shaft drilling tool of 2 * 90kw or 2 * 110kw unit head that decomposed rock or cobble soil layer are blended, carry out again triaxial cement mixing pile construction injection and contain bentonitic cement grout.
3. superhard soil layer triaxial cement mixing pile job practices according to claim 1 and 2 is characterized in that, adds in drawing decomposed rock that the hole blends or cobble soil layer fragment and buries or sand, then carries out the triaxial cement mixing pile construction.
4. superhard soil layer triaxial cement mixing pile job practices according to claim 3 is characterized in that, the cement mixing method cement mixing content that is made of decomposed rock or cobble soil layer and cement grout＞20%.
5. superhard soil layer triaxial cement mixing pile job practices according to claim 1 and 2, it is characterized in that, triaxial cement mixing pile construction hoisting speed＜50cm/min, triaxial cement mixing pile construction back and forth whitewashing is decided spray to decomposed rock or cobble soil layer part more than twice.
6. superhard soil layer triaxial cement mixing pile job practices according to claim 1 is characterized in that, the described hole of drawing is that the hole is drawn at the interval.
7. superhard soil layer triaxial cement mixing pile job practices according to claim 1 is characterized in that, the described hole of drawing is for all drawing the hole.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107938652A (en) * | 2018-01-03 | 2018-04-20 | 山东科技大学 | A kind of embedding lithotype steel cement mixing wall and its construction method |
| CN109098175A (en) * | 2018-08-21 | 2018-12-28 | 江苏兴厦建设工程集团有限公司 | A kind of tri-axes deep mixing pile construction method |
| CN112282767A (en) * | 2020-10-21 | 2021-01-29 | 江苏旭辰交通科技发展有限公司 | Ultra-deep reinforcement construction method for shield end soil body under water-rich silty-fine sand geology |
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| CN101603309A (en) * | 2009-07-02 | 2009-12-16 | 北京建材地质工程公司 | Occlusive pile of long spiral stirring water-stop curtain and construction technology thereof |
| CN101768961A (en) * | 2010-01-22 | 2010-07-07 | 中铁二十二局集团第六工程有限公司 | Construction method of section-steel triaxial soil-cement mixing pile |
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- 2012-12-11 CN CN2012105323166A patent/CN102979095A/en active Pending
Patent Citations (4)
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| JPH05263421A (en) * | 1992-03-19 | 1993-10-12 | Takenaka Komuten Co Ltd | Column type earth retaining wall |
| CN101255689A (en) * | 2008-03-12 | 2008-09-03 | 何世鸣 | Long helical spraying-rotary stirring soilcement purdah pile as well as construction method thereof |
| CN101603309A (en) * | 2009-07-02 | 2009-12-16 | 北京建材地质工程公司 | Occlusive pile of long spiral stirring water-stop curtain and construction technology thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107938652A (en) * | 2018-01-03 | 2018-04-20 | 山东科技大学 | A kind of embedding lithotype steel cement mixing wall and its construction method |
| CN107938652B (en) * | 2018-01-03 | 2023-08-22 | 山东科技大学 | Rock-inlaid steel reinforced cement stirring wall and construction method thereof |
| CN109098175A (en) * | 2018-08-21 | 2018-12-28 | 江苏兴厦建设工程集团有限公司 | A kind of tri-axes deep mixing pile construction method |
| CN112282767A (en) * | 2020-10-21 | 2021-01-29 | 江苏旭辰交通科技发展有限公司 | Ultra-deep reinforcement construction method for shield end soil body under water-rich silty-fine sand geology |
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Application publication date: 20130320 |