CN1240860A - Cast-in-situ method for forming piles by drilling hole and pouring grout - Google Patents
Cast-in-situ method for forming piles by drilling hole and pouring grout Download PDFInfo
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- CN1240860A CN1240860A CN 99108024 CN99108024A CN1240860A CN 1240860 A CN1240860 A CN 1240860A CN 99108024 CN99108024 CN 99108024 CN 99108024 A CN99108024 A CN 99108024A CN 1240860 A CN1240860 A CN 1240860A
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Abstract
A cast-in-situ method for forming piles by drilling holes and pouring grout includes drilling hole to designed depth, pouring slowly-setting cement grout to hole bottom through the pouring hole on drill bit before lifting drilling rod, uniformly pouring said grout while lifting the drilling rod until the drilling rod is lifted to the position where there are no diameter reduction and collapse danger, loading down reinforcing bar cage after drilling rod is fully lifted up, and pouring concrete while recovering slowly setting cement grout for cyclic use. Its advantages are greatly improved mechanical performance of earth body, high qualities of pile and concrete at pile end, saving cement and low cost of engineering.
Description
The present invention relates to a kind of cast-in-situ method for forming piles by drilling hole and pouring grout, mainly supply in the engineerings such as ground stabilization, pattern foundation pit supporting structure, pile foundation, transportation and energy's harbour and reservoir leak stopping, be used for forming reinforced concrete pile or form diaphragm wall by annotating stake.
On October 12nd, 1987, bore slurry pressuring pile-forming (patent No. is 86100705, and the applying date is 860125) was announced in authorization.Be bored into desired depth, carry brill and spray light water mud by the nozzle that is located on the drill bit to the hole inner high voltage simultaneously, to the slurries face reach do not have a hole danger position that collapses till, in the hole, place reinforcing cage after pulling out of hole, throw full pellet, and put into Grouting Pipe at the bottom of at least one clear opening and make the 2nd sub-high pressure and mend slurry, arrive the aperture to slurries till.Its weak point is: the input pellet is a coarse aggregate, and coarse aggregate influences the bonding of itself and cement outward for foreign material such as soil, stone flour, and pile body is a non-fine concrete, thereby causes the intensity of pile body low bigger with fragility; Again because pile crown place grouting pressure reduces, and impurity is many and be difficult for getting rid of in the cement paste, thereby cause the pile crown place easily broken, loose and intensity is lower; Also, cause the cement paste consumption big, thereby cause the wasting of resources and cost height owing to throw in coarse aggregate and high pressure injection benefit slurry.
The objective of the invention is to overcome above-mentioned weak point of the prior art and provide a kind of at soft soil, quicksand, high underground water, easily collapse under the various complex geological conditions such as hole pore-forming pile, the pile body smoothly and surrounding soil is combined closely, cost is lower and can guarantee the cast-in-situ method for forming piles by drilling hole and pouring grout of quality moulded.
Purpose of the present invention can reach by following measure: be bored into projected depth, before carrying brill, go into the retarded cement slurries to the hole rising pouring by the injected hole that is located on the drill bit, brill is evenly carried on marginal not slurry limit, slip casting does not extremely take place till the position of the undergauge and the hole danger of collapsing, drilling rod proposes the back fully and put into reinforcing cage in the hole, concrete perfusion in the hole reclaims the retarded cement slurries simultaneously then, in order to recycling.
The height of going into the retarded cement slurries to the hole rising pouring equals stake 5-10 directly doubly, is preferably 5-8 doubly.
Annotate the extended slurry liquid level when carrying brill and need 3-5 rice on drill bit.
The grouting pressure that injects the retarded cement slurries is the 5-100 kg/cm.
The grouting amount that injects the retarded cement slurries be the 0.3-0.5 cubic meter/minute.
The slow setting time of injecting the retarded cement slurries is 7-12 hour, is preferably 8-10 hour.
The invention will be further described below in conjunction with embodiment:
Earlier be bored into projected depth with existing rig with by existing boring method, before carrying brill, go into to be equivalent to the directly retarded cement slurries of 5-10 (being preferably 5-8) double-length degree of stake to the hole rising pouring by the injected hole on the drill bit, brill is evenly carried on marginal not slurry limit then, carrying when boring liquid level must remain on the drill bit about 3-5 rice, slip casting is to there not being undergauge to collapse till the danger position of hole, drilling rod proposes the back fully and put into reinforcing cage in the hole, use concrete perfusion at the bottom of the hole of existing notes bucket deferent in reinforcing cage again, the marginal not limit is carried and is annotated the bucket deferent to the aperture, receive the retarded cement slurries with blowback simultaneously, in order to recycling.
According to the variation of formation condition, grouting pressure changes in 5-100 kilogram/square thick rice, and grouting amount is more than per minute 0.3-0.5 cubic meter, and retarded cement slurries setting time 8-12 (being preferably 7-10) hour, the concrete perfusion strength grade was by designing requirement.
Embodiments of the invention: pour into 600 millimeters, long 27 meters reinforced concrete foundation stake, geological conditions is that 0-6.0 rice is miscellaneous fill and silt, 6.0-13.1 rice is silty clay and clay, 13.1-29.0 be flour sand, underground is a underground water for 2 meters, is the artesian water of 8.5 heads below 7 meters.The retarded cement slurries consist of the retardation water reducing agent of No. 425 cement+cement weights 0.5%, and water/binder ratio is 0.5-0.6, and slurries are annotated the aperture, perfusion C25 concrete, and with the accumulation load method test, ultimate bearing capacity of single pile is 4400KN at last.
The present invention contrasts prior art and has following advantage: because slow-setting cement grout is under pressure to stake end and stake The expansion of week soil oozes, compacted, full, reinforcing and retaining wall effect, improved the mechanical property of the soil body, quicksand, Soft mould under the complex geological conditions such as soil, underground high artesian all can pile, and concrete perfusion is design strength, has guaranteed Pile quality, pile concrete was upward combined closely by slow-setting cement grout with an end and stake week simultaneously, avoided because of perfusion Concrete shrinkage and the problems such as the space constriction that causes and fracture, stake end bearing capacity and side friction improve greatly, The pile body actual strength is guaranteed. The slow-setting cement grout setting time can be cycled to repeat use at 7-12 hour, and is big Saved greatly cement consumption, prior art is every cubic meter of concrete cement 0.9-1.9 ton, and the present invention only needs 0.4 ton About. Reduce cost, avoided waste, improved economic benefit. Therefore the present invention has wide adaptability, bearing capacity High, cost is low and the pile strength advantages of higher.
Claims (6)
1, a kind of cast-in-situ method for forming piles by drilling hole and pouring grout, it is characterized in that, be bored into projected depth, go into the retarded cement slurries by the injected hole that is located on the drill bit to the hole rising pouring before carrying brill, brill is evenly carried on marginal not slurry limit, and slip casting does not extremely take place till the position of the undergauge and the hole danger of collapsing, drilling rod proposes the back fully and put into reinforcing cage in the hole, concrete perfusion in the hole reclaims the retarded cement slurries simultaneously then, in order to recycling.
2, cast-in-situ method for forming piles by drilling hole and pouring grout according to claim 1 is characterized in that, the height of going into the retarded cement slurries to the hole rising pouring equals stake 5-10 directly doubly, is preferably 5-8 doubly.
3, cast-in-situ method for forming piles by drilling hole and pouring grout according to claim 1 is characterized in that, annotates the extended slurry liquid level when carrying brill and needs 3-5 rice on drill bit.
4, cast-in-situ method for forming piles by drilling hole and pouring grout according to claim 1 is characterized in that, the grouting pressure that injects the retarded cement slurries is the 5-100 kg/cm.
5, cast-in-situ method for forming piles by drilling hole and pouring grout according to claim 1 is characterized in that, the grouting amount that injects the retarded cement slurries be the 0.3-0.5 cubic meter/minute.
6, cast-in-situ method for forming piles by drilling hole and pouring grout according to claim 1 is characterized in that, the slow setting time of injecting the retarded cement slurries is 7-12 hour, is preferably 8-10 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99108024A CN1112485C (en) | 1999-06-07 | 1999-06-07 | Cast-in-situ method for forming piles by drilling hole and pouring grout |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99108024A CN1112485C (en) | 1999-06-07 | 1999-06-07 | Cast-in-situ method for forming piles by drilling hole and pouring grout |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1240860A true CN1240860A (en) | 2000-01-12 |
| CN1112485C CN1112485C (en) | 2003-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99108024A Expired - Fee Related CN1112485C (en) | 1999-06-07 | 1999-06-07 | Cast-in-situ method for forming piles by drilling hole and pouring grout |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1112485C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100335257C (en) * | 2004-05-09 | 2007-09-05 | 中山市三和建材有限公司 | Novel circulating use method for residual grout of PHC pipe pile |
| CN101713189B (en) * | 2008-10-06 | 2012-10-17 | 吴保全 | Construction process of floral tube dry filling piles |
| CN105862990A (en) * | 2016-03-24 | 2016-08-17 | 上海市机械施工集团有限公司 | Prefabricated assembly well wall structure and construction method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447347C (en) * | 2003-11-26 | 2008-12-31 | 株式会社丸德基业 | Construction method of cement earth pile |
| CN1306121C (en) * | 2004-08-05 | 2007-03-21 | 陈佳训 | Method for pile foundation construction of geologic structure with flow plastic half-flow plastic and its application apparatus |
-
1999
- 1999-06-07 CN CN99108024A patent/CN1112485C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100335257C (en) * | 2004-05-09 | 2007-09-05 | 中山市三和建材有限公司 | Novel circulating use method for residual grout of PHC pipe pile |
| CN101713189B (en) * | 2008-10-06 | 2012-10-17 | 吴保全 | Construction process of floral tube dry filling piles |
| CN105862990A (en) * | 2016-03-24 | 2016-08-17 | 上海市机械施工集团有限公司 | Prefabricated assembly well wall structure and construction method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1112485C (en) | 2003-06-25 |
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