CN1247921A - Construction method of cement pressing air stirring concrete pile - Google Patents
Construction method of cement pressing air stirring concrete pile Download PDFInfo
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- CN1247921A CN1247921A CN 99112616 CN99112616A CN1247921A CN 1247921 A CN1247921 A CN 1247921A CN 99112616 CN99112616 CN 99112616 CN 99112616 A CN99112616 A CN 99112616A CN 1247921 A CN1247921 A CN 1247921A
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Abstract
The pile constructing method is suitable for various geologic conditions and can construct reinforced concrete pile combined closely with peripheral soil. The construction process of the present invention includes: drilling hole to preset depth, spraying high-pressure cement grout through the nozzle in auger while drawing out the auger until reaching the height without collapse tendency, depositing welded reinforcement cage, depositing two, one long and one short, steel pipes, introducing comprssed air through the long pipe to stir ballast and sand thrown to the hole, and making up cement grout through the short pipe to construct the pile.
Description
The present invention is a kind of concrete pile base construction method, belongs to the fixed building technical field.
At present China's concrete filling pile construction method commonly used mostly is the mud off pore-forming, does operation auger bore and sleeve pipe follow-up pore-forming, bore slurry pressuring pile-forming, but they all have certain defective as:
The mud off stake: contaminated environment, pore-forming is slow, and hole bed mud slag is difficult to draw to the greatest extent, makes pile capacity stable inadequately.
Do the operation auger bore: the soil layer that inapplicable mud and mucky soil and groundwater level are high.
Vibrator pipe sinking cast-in-place pile: produce dry sound pollution, be not suitable for hard sand, rubble and the soil layer of hard interbedded layer is arranged.
Bore slurry pressuring pile-forming: the stake less than the 300mm diameter comprises that 300mm lapidation amount is not enough, should block rubble at the reinforcing cage place and make the bottom of stake not have rubble to cause concrete strength to reduce.
Listed PIP worker's method of perfusion reinforced concrete pile in [kind and the speciality of colonnade formula ground lower wall local method] literary composition of Japan's [basis soil] academic periodical the 8th phase of nineteen eighty-two, PIP worker's method is the once grouting pile and since factors such as the loss of slurries in solidifying, contraction can cause the long-pending soil of pile body the gap, influence the combination that pile body amasss the soil body.Construction technology 1992 (2) Tao Yi [bore slurry pressuring pile-forming construction technology].Deng the drilled pressure filling pulping method that proposes in the literary composition is once grouting, then to the hole introversion throw in rubble by the slip casting sebific duct to the hole second pulp feeding, but because of cement paste concentration decision lapidation amount what, the big lapidation amount of cement paste concentration is not enough, and cement paste concentration small intensity grade does not reach C20.Stake less than the 300mm diameter comprises that 300mm lapidation amount is not enough, should block rubble at the reinforcing cage place and make the bottom of stake not have rubble to cause concrete pile intensity to reduce.
The objective of the invention is to disclose a kind of construction method of cement pressing air stirring concrete pile, the deposited reinforced concrete pile that can under various geological conditionss, carry out and pile body and surrounding soil densification are combined.
Job practices of the present invention comprises:
1. be bored into desired depth;
When carrying brill by be located at the cement paste that drill bit nozzle prepares to the high pressure spray in the hole.Pressure during nozzle spray slurries can be in the 3-20Mpa scope
3. slurries reach the position of the hole danger of not collapsing;
4. good reinforcing cage is welded in the back placement in the hole that pulls out of hole in advance;
5. the built-in steel of going up root one long (0.5-1 at the bottom of the hole) short (2-3 rice at the bottom of the hole) in hole is mended pipe;
6. the air compressor airduct is connected on long the benefit on the slurry pipe and starts air compressor, then, in the hole, drop into rubble, medium sand, should make the slurry face must be on rubble and medium sand, till slurries reach the aperture to the aperture.Gas stirs rubble, medium sand;
7. drop into behind stone, the sand by the short repeatedly moisturizing mud of mending in the slurry Guan Xiangkong, force value is in the 1-10Mpa scope, and moisturizing mud should be finished before the cement paste initial setting time.
According to the difference of geological conditions, the proportioning volume of the coarse aggregate of a whole pile body fines and cement paste is 1: 0.4: 0.6.The proportioning of cement pulp-water ash is 0.55.
The advantage of this technology is:
(1) direct pressure injection cement paste can not produce undergauge, pile breaking phenomenon.The boring of employing spiral drilling machine during concrete perfusion, can't be vibrated because the reinforcing cage arrangement of reinforcement is close, section is little, stake is dark, and stone easily is stuck on the reinforcing cage, causes the contraction of slurries loss and concrete self, produces undergauge and pile breaking phenomenon.And this method pressure injection cement paste is a liquid, input is thick, fines stirs in cement paste through the gas that air compressor produces, adopt and repeatedly mend slurry, eliminate the space, can also with behind the mud jacking first since hole wall to absorption, the loss of slurries, receive and produce and obtain filling, guaranteed that the pile body concrete forms the even compact body, can not produce undergauge, pile breaking phenomenon.
(2) slip casing by pressure can improve the bearing capacity of stake, this method is owing to adopt slip casing by pressure and repetition slip casing by pressure technology from bottom to top, not only pile body is closely knit, and the soil body around the pile body there is tangible infiltration, reinforces compacted effect, and local expansion hole enlargement is arranged, the pile body of " sugarcoated haws " formula of formation has strengthened the frictional force between the stake and the soil body greatly.The formed stake of this method, the advantage of existing friction pile can guarantee the quality of end bearing pile again.
During (3) as curtain pile, need any ancillary method to guarantee the stable of inter-pile soil.Spiral drilling machine when construction disturbance hole wall, concrete perfusion can't vibrate again, the curtain pile of formation and the hole wall soil body are the stability that guarantees inter-pile soil in conjunction with not tight, must adopt betray, whitewashing or other ancillary method.And this method is owing to adopt slip casing by pressure, the diffusion of slurries, infiltration, compacted consolidation, the pile body that makes formation and the tight gluing of the soil body together, having guaranteed does not need to use any ancillary method by stablizing of inter-pile soil again.
(4) stake of this method formation is for there being sand concrete, so use cement amount to lack than the bore slurry pressuring pile-forming consumption.At the bottom of the construction costs and can construct under unfavorable geological condition, pollution-free without mud off, speed of application is fast.
Construction technology is to adopt the general stake of long-spiral drilling machine pore-forming footpath to be 300-800mm, the degree of depth in 20m, according to main frame pile frame and counterweight, the darkest 30m that reaches.In the city, also available 600, the 1000 type rig pore-formings in narrow place do the 250mm Small Diameter Pile.
The main construction sequence of pouring mortar pile is: with thick, the fines of placing reinforcing cage, air compressor generation gas stirring input after long-spiral drilling machine boring, mud jacking, the trip-out, repeatedly mend and starch pile.
Accompanying drawing 1 is process chart of the present invention
During construction,, creep into the earthwork of discharge with cleaning with holing according to the boring of plan measuring stake position, and according to the geological condition in the situation analysis judgement hole that gets out soil.Behind the absolute altitude, better at the bottom of being drilled into as geological condition, drilling rod elder generation descending reinforcing cage can be proposed, by the grouting of top, hole, otherwise should take in the hole slip casting or compressed water slurry retaining wall while holing.Propose behind the drilling rod install reinforcing cage immediately, connect the air compressor airduct, open that the air compressor input is thick, fines is to the aperture, repeatedly mends slurry, till not descending to the aperture slurries to mending on the slurry pipe.
According to the difference of geological conditions, the pressure during nozzle spray slurries can change in the 3-20Mpa scope, and the force value of second pulp feeding changes in the 1-10Mpa scope.The proportioning volume of the coarse aggregate of a whole pile body fines and cement paste is 1: 0.4: 0.6.The proportioning of cement pulp-water ash is 0.55.
Claims (1)
1, a kind of construction method of cement pressing air stirring concrete pile comprises:
(1). be bored into desired depth;
(2). when carrying brill by be located at the cement paste that drill bit nozzle prepares to the high pressure spray in the hole.Pressure during nozzle spray slurries can be in the 3-20Mpa scope
(3). slurries reach the position of the hole danger of not collapsing;
(4). the good reinforcing cage of welding is in advance placed in the back that pulls out of hole in the hole;
(5). the steel that the hole is built-in goes up root one long (0.5-1 rice at the bottom of the hole) short (2-3 rice at the bottom of the hole) is mended pipe;
(6). the air compressor airduct is connected on long the benefit on the slurry pipe starts air compressor, then, in the hole, drop into rubble, medium sand, should make the slurry face must be on rubble and medium sand, till slurries reach the aperture to the aperture.Gas stirs rubble, medium sand;
(7). drop into behind stone, the sand by the short repeatedly moisturizing mud of mending in the slurry Guan Xiangkong, force value is in the 1-10Mpa scope, and moisturizing mud should be finished before the cement paste initial setting time.
The proportioning volume of the coarse aggregate of a whole pile body fines and cement paste is 1: 0.4: 0.6.The proportioning of cement pulp-water ash is 0.55.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99112616 CN1247921A (en) | 1999-01-06 | 1999-01-06 | Construction method of cement pressing air stirring concrete pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99112616 CN1247921A (en) | 1999-01-06 | 1999-01-06 | Construction method of cement pressing air stirring concrete pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1247921A true CN1247921A (en) | 2000-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99112616 Pending CN1247921A (en) | 1999-01-06 | 1999-01-06 | Construction method of cement pressing air stirring concrete pile |
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| CN (1) | CN1247921A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1973091B (en) * | 2004-07-26 | 2010-05-05 | 约翰·M·冈瑟 | Process to prepare in-situ pilings in clay soil |
| CN102704478A (en) * | 2012-06-08 | 2012-10-03 | 黄水森 | Building anchor rod construction technology |
-
1999
- 1999-01-06 CN CN 99112616 patent/CN1247921A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1973091B (en) * | 2004-07-26 | 2010-05-05 | 约翰·M·冈瑟 | Process to prepare in-situ pilings in clay soil |
| CN102704478A (en) * | 2012-06-08 | 2012-10-03 | 黄水森 | Building anchor rod construction technology |
| CN102704478B (en) * | 2012-06-08 | 2015-04-22 | 黄水森 | Building anchor rod construction technology |
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