CN109235438B - Rapid hole cleaning method for prestressed concrete hollow pile - Google Patents
Rapid hole cleaning method for prestressed concrete hollow pile Download PDFInfo
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- CN109235438B CN109235438B CN201811062048.XA CN201811062048A CN109235438B CN 109235438 B CN109235438 B CN 109235438B CN 201811062048 A CN201811062048 A CN 201811062048A CN 109235438 B CN109235438 B CN 109235438B
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- prestressed concrete
- blowing
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- hollow pile
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/08—Removing obstacles
Abstract
A quick hole cleaning method for a prestressed concrete hollow pile comprises pre-blowing and cleaning; pre-blowing, namely blowing air into the prestressed concrete hollow pile by utilizing pre-blowing air, and stirring the mud-water mixture in the prestressed concrete hollow pile with strong force to form uniform slurry, wherein the pre-blowing air is air of at least 12 m/s; and blowing, namely blowing the slurry in the prestressed concrete hollow pile by using a blowing machine to form turbulent flow in the slurry in the prestressed concrete hollow pile, and blowing the slurry out of the prestressed concrete hollow pile, wherein the blowing machine is at least 23 m/s of wind. The method has the advantage that the hole cleaning time for the prestressed concrete hollow pile with the diameter of 9.5-24 cm is compressed for 1-2 minutes.
Description
Technical Field
The invention relates to a hole cleaning method for a prestressed concrete hollow pile, in particular to a rapid hole cleaning method for a prestressed concrete hollow pile.
Background
The unit types of the landforms of the field are coastal sedimentary plain, coastal tide shallow beach, and a deeper sludge layer and a backfill soil layer exist on the bearing stratum. Therefore, the company needs to adopt a foundation mode of pile foundation and bearing platform to solve the problem, and the number of the pile foundations is expected to reach 10000 (prestressed concrete hollow piles). In the construction process, after the prestressed concrete hollow pile is driven, in the process of pulling out the pile driver, surface soil around the pile top can be squeezed into the pile core along with underground water, and then reinforced concrete with the depth of 4 meters needs to be poured into the pile core in the subsequent construction, so that the pulling resistance and the floating resistance of the foundation are improved. Therefore, the soil in the hollow pile needs to be cleaned before pouring. In traditional work progress, on-spot through using instruments such as spade, steel sheet and ladle, artifical manual clearance stake hole one by one, but the clear quantity in hole of stake core is huge and the aperture in stake hole is less (the aperture is generally 9.5 ~ 24 cm), and the inside debris of difficult entering stake hole clearance of spade, easy messenger's debris sink during the steel sheet clearance, and the silt of ladle clearance at every turn is few, and work efficiency is low, and the cost of labor is high.
Disclosure of Invention
The invention aims to solve the technical problem of providing a quick hole cleaning method for a prestressed concrete hollow pile, wherein the hole cleaning time for the prestressed concrete hollow pile with the diameter of 9.5-24 cm is compressed for 1-2 minutes, and the prestressed concrete hollow pile does not need to be manually put into a hole for secondary hole cleaning.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a quick hole cleaning method for a prestressed concrete hollow pile comprises pre-blowing and cleaning;
the pre-blowing is carried out, wherein pre-blowing is used for blowing air into the prestressed concrete hollow pile, and the mud-water mixture in the hollow part of the upper half part of the prestressed concrete hollow pile is stirred strongly to form uniform slurry, and the pre-blowing is air with the air size of at least 12 m/s;
and blowing, namely blowing the slurry in the prestressed concrete hollow pile by using a blowing machine to form turbulent flow, and blowing the slurry out of the prestressed concrete hollow pile, wherein the blowing is at least 23 m/s of wind.
Further, the method further comprises cleaning the hole;
and cleaning the hole, namely injecting clear water into the prestressed concrete hollow pile to clean the prestressed concrete hollow pile, and then flushing out the cleaned water by using wind with the wind speed of more than 20 m/s.
Furthermore, the diameter of the prestressed concrete hollow pile is 9.5-24 cm, and the time for pre-blowing wind from 0 m/s to 12 m/s is 15 seconds to 25 seconds.
Further, the diameter of the prestressed concrete hollow pile is 9.5-24 cm, and the time of clear air blowing from pre-blowing to air of 23 m/s is from 20 seconds to 30 seconds.
Further, when pre-blowing, the included angle between the pre-blowing central line and the bottom surface inside the prestressed concrete hollow pile is 80-90 degrees.
Further, when the air is blown, the included angle between the central line of the air and the inner bottom surface of the prestressed concrete hollow pile is 45-60 degrees.
The invention has the advantages that the gas sprayed out at high speed is utilized to strongly stir the mud-water mixture in the hollow pile, the blocky soil forms uniform slurry with underground water after being refined, then the air flow is increased, the mud forms turbulent flow under the action of high-pressure air, the circulation of the mud is accelerated, the mud is blown out from the inner hole of the hollow pile, then clean water is injected to clean the inner hole of the hollow pile, the clean water is blown out again to finish the hole cleaning work, the whole process only needs 1 to 2 minutes, the rework rate after the hole cleaning is less than 5 percent, the existing hole cleaning method adopting manual cleaning generally needs 30 to 40 minutes, in addition, the existing hole cleaning method adopting gas needs 4 to 5 minutes, the rework rate after the hole cleaning is also higher than 40 percent, therefore, the hole cleaning by the aid of gas must be matched with manual work at present, and the hole cleaning by the aid of gas is almost not needed.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 shows a cleaning head fixture.
As shown, a weight plate 1 and a nozzle hole 2.
Detailed Description
In a construction site, a movable high-power diesel air compressor (serving as a wind source of high-speed wind) is adopted, the power of the air compressor is 45KW, compressed air is output by a hose, the length of the hose is about 100 meters, the operations of pipe taking and pipe putting when the diesel air compressor moves can be reduced, and the like are performed, the front end of the hose is connected with a 6-meter stainless steel pipe serving as a spray head (the spray head is placed into a prestressed concrete hollow pile when holes are cleaned, the stainless steel pipe has certain weight, and does not swing excessively under the condition of high-speed jet flow, so that operation of operators can conveniently operate), before hole cleaning is completed, after all excavation of a foundation pit is completed, construction operations of all pile cutting and pile connecting at positions with inconsistent elevations are firstly completed (firstly, holes are cleaned firstly and then are cleaned secondly in the traditional process flow, the working flow of pile cutting is improved to be that after all excavation of the foundation pit is completed, holes are cleaned secondly, hole cleaning, unnecessary operations are reduced.
When clearing the hole, place clear first fixing device of hole (as figure 1) in the top of prestressed concrete hollow pile earlier, clear first fixing device of hole include the weight plate 1 that contacts with ground (weight plate 1 mainly provides an operation platform for the operator, can also can adopt mobilizable platform with the scaffold) weight plate 1 on be equipped with shower nozzle hole 2, during the use, the shower nozzle passes weight plate 1 from shower nozzle hole 2 and gets into in the prestressed concrete hollow pile, the shower nozzle haulage rope is connected on the shower nozzle and passes weight plate 1 through shower nozzle hole 2 to adjust position and the angle of shower nozzle in the prestressed concrete hollow pile through shower nozzle haulage rope.
The hole cleaning process is as follows, and the quick hole cleaning method for the prestressed concrete hollow pile comprises pre-blowing, cleaning and hole cleaning;
pre-blowing, namely blowing air to the prestressed concrete hollow pile by utilizing the pre-blowing air, stirring the mud-water mixture in the prestressed concrete hollow pile with strong force to form uniform slurry, the pre-blowing is 12-15 m/s, the diameter of the prestressed concrete hollow pile is 9.5-24 cm, the time of the pre-blowing is 15-25 s from 0 m/s to 12 m/s, and maintaining the wind of 12-15 m/s for 5-10 s, preferably, pre-blowing, the included angle between the central line of the pre-blowing air and the bottom surface of the interior of the prestressed concrete hollow pile is 80-90 degrees, nearly vertical blowing is adopted, can quickly refine the massive soil and prevent the massive soil from being directly blown out of the prestressed concrete hollow pile, harming operators and simultaneously collecting soil to the periphery of the bottom in the prestressed concrete hollow pile;
blowing, namely blowing the slurry at the hollow part at the upper half part of the prestressed concrete hollow pile by using a blowing machine to form turbulent flow at the hollow part at the upper half part of the prestressed concrete hollow pile, blowing the slurry from the hollow part at the upper half part of the prestressed concrete hollow pile, wherein the blowing machine is 23-28 m/s of wind, the diameter of the prestressed concrete hollow pile is 9.5-24 cm, the time of the blowing machine from pre-blowing to the wind of 23 m/s is from 20 seconds to 30 seconds, and the 23-28 m/s of wind is maintained for 10-15 seconds, preferably, the included angle between the central line of the blowing machine and the bottom surface of the hollow part at the upper half part of the prestressed concrete hollow pile is 45-60 degrees during blowing, and oblique blowing is adopted, so that the slurry gathered around the bottom part in the prestressed concrete hollow pile can directly flow upwards along the inner wall, and the interior of the prestressed concrete hollow pile is discharged, in operation, the nozzle can rotate 360 degrees in the prestressed concrete hollow pile by pulling the rope through the nozzle, so that the slurry can be blown out at an accelerated speed.
And (3) cleaning the hole, stopping blowing when clear water is poured, injecting the clear water into the hollow part at the upper half part of the prestressed concrete hollow pile to clean the prestressed concrete hollow pile, then flushing out the cleaned water by utilizing the wind with the wind speed of more than 20 m/s, and generally drying the water according to the water quantity for 10-15 seconds.
In the site experiment of the site of the Dong Koujin economic area of Qingdao city in Shandong province, in order to understand the innovation point of the invention, the inventor adopts three groups of A \ B \ C to test the hole cleaning quality, each group has 60 cleaning and blowing, the three groups of test conditions are basically the same as the content of the patent claims, and the difference is that;
in the A group of test conditions, the pre-blowing wind speed is 10 m/s, the clear blowing wind speed is 15 m/s, 60 holes are cleared, and the subsequent inspection is carried out, wherein 32 holes need to be cleared secondarily, mainly the residual soil in the holes is too much, mainly massive soil and does not meet the construction requirements;
in the test conditions of the group B, the included angle between the pre-blowing central line and the inner bottom surface of the prestressed concrete hollow pile is less than 80 degrees, the included angle between the blowing central line and the inner bottom surface of the prestressed concrete hollow pile is more than 60 degrees, 60 holes are cleaned, and in the subsequent inspection, 25 holes need to be cleaned for the second time, mainly, excessive muddy water remains in the holes, and the construction requirements are not met;
in the test conditions of the group C, the method is completely the same as the patent method, 60 holes are cleaned, only 3 holes are cleaned for the second time in subsequent inspection, mainly, the residual soil in the holes is too much, only 28 holes are cleaned for the second time in the subsequent 760 holes to be cleaned by using the method, the rework rate is only 3.8 percent, the holes are cleaned for the second time by using the method of the invention, and finally only 6 holes are cleaned manually.
The invention, although simple, achieves good efficiency in practice, in particular with regard to the preference for specific parameters, so that the method is only theoretically conceivable from the original point of view and is now ready for practice.
Claims (3)
1. A quick hole cleaning method for a prestressed concrete hollow pile is characterized by comprising the following steps: the method comprises pre-blowing, blowing and hole cleaning;
placing a hole cleaning head fixing device above the prestressed concrete hollow pile, wherein the hole cleaning head fixing device comprises a balance weight plate which is in contact with the ground, a spray head hole is formed in the balance weight plate, when the hole cleaning head fixing device is used, a spray head penetrates through the balance weight plate from the spray head hole and enters the prestressed concrete hollow pile, a spray head pulling rope is connected to the spray head and penetrates through the balance weight plate through the spray head hole, and the position and the angle of the spray head in the prestressed concrete hollow pile are adjusted through the spray head pulling rope;
the pre-blowing is carried out, wherein pre-blowing is used for blowing air into the prestressed concrete hollow pile, and the mud-water mixture in the prestressed concrete hollow pile is stirred with strong force to form uniform slurry, the pre-blowing is at least 12 m/s of air, and during pre-blowing, the included angle between the central line of the pre-blowing and the bottom surface of the prestressed concrete hollow pile is 80-90 degrees;
the cleaning and blowing are carried out, wherein cleaning and blowing are carried out on the slurry in the prestressed concrete hollow pile, so that the slurry in the prestressed concrete hollow pile forms turbulent flow, the slurry is blown out from the interior of the prestressed concrete hollow pile, the cleaning and blowing is carried out at least 23 m/s, and the included angle between the central line of the cleaning and blowing and the bottom surface of the interior of the prestressed concrete hollow pile is 45-60 degrees during cleaning and blowing;
and cleaning the hole, namely injecting clear water into the prestressed concrete hollow pile to clean the prestressed concrete hollow pile, and then flushing out the cleaned water by using wind with the wind speed of more than 20 m/s.
2. The rapid hole cleaning method for the prestressed concrete hollow pile as claimed in claim 1, characterized in that: the diameter of the prestressed concrete hollow pile is 9.5-24 cm, the pre-blowing is 12 m/s of wind, and the time for the wind speed to be from 0 m/s to 12 m/s is 15 seconds to 25 seconds.
3. The rapid hole cleaning method for the prestressed concrete hollow pile as claimed in claim 1, characterized in that: the diameter of the prestressed concrete hollow pile is 9.5-24 cm, the air blowing is 23 m/s, and the air speed is from 12 m/s to 23 m/s, and the time is from 20 s to 30 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811062048.XA CN109235438B (en) | 2018-09-12 | 2018-09-12 | Rapid hole cleaning method for prestressed concrete hollow pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811062048.XA CN109235438B (en) | 2018-09-12 | 2018-09-12 | Rapid hole cleaning method for prestressed concrete hollow pile |
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| CN109235438A CN109235438A (en) | 2019-01-18 |
| CN109235438B true CN109235438B (en) | 2020-09-08 |
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Citations (5)
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|---|---|---|---|---|
| KR100677165B1 (en) * | 2005-11-01 | 2007-02-02 | 주식회사 동아지질 | A slime removal apparatus and it's removal method |
| CN101353951A (en) * | 2008-09-05 | 2009-01-28 | 中建七局第三建筑有限公司 | Pile bottom hole clearing system and process of pile bottom hole clearing |
| CN103195074A (en) * | 2013-03-27 | 2013-07-10 | 上海市机械施工有限公司 | Bottom cleaning method of pile foundation |
| CN107083932A (en) * | 2017-06-20 | 2017-08-22 | 北京市政建设集团有限责任公司 | The installation method of steel pipe column in the clean cycle equipment that drills and pilot tunnel |
| CN206785338U (en) * | 2017-04-19 | 2017-12-22 | 核工业长沙中南建设工程集团公司 | A kind of underwater pile secondary pile hole cleaning device |
-
2018
- 2018-09-12 CN CN201811062048.XA patent/CN109235438B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100677165B1 (en) * | 2005-11-01 | 2007-02-02 | 주식회사 동아지질 | A slime removal apparatus and it's removal method |
| CN101353951A (en) * | 2008-09-05 | 2009-01-28 | 中建七局第三建筑有限公司 | Pile bottom hole clearing system and process of pile bottom hole clearing |
| CN103195074A (en) * | 2013-03-27 | 2013-07-10 | 上海市机械施工有限公司 | Bottom cleaning method of pile foundation |
| CN206785338U (en) * | 2017-04-19 | 2017-12-22 | 核工业长沙中南建设工程集团公司 | A kind of underwater pile secondary pile hole cleaning device |
| CN107083932A (en) * | 2017-06-20 | 2017-08-22 | 北京市政建设集团有限责任公司 | The installation method of steel pipe column in the clean cycle equipment that drills and pilot tunnel |
Non-Patent Citations (2)
| Title |
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| 张红娟.高压射风辅助清孔在钻孔灌注桩中的应用.《城市建设理论研究（电子版）》.2014,(第7期),第1-4页. * |
| 高压射风辅助清孔在钻孔灌注桩中的应用;张红娟;《城市建设理论研究（电子版）》;20140401(第7期);第1-4页 * |
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