CN103498466A - Construction technique for preventing hole collapse of bored cast-in-place pile - Google Patents
Construction technique for preventing hole collapse of bored cast-in-place pile Download PDFInfo
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- CN103498466A CN103498466A CN201310491749.6A CN201310491749A CN103498466A CN 103498466 A CN103498466 A CN 103498466A CN 201310491749 A CN201310491749 A CN 201310491749A CN 103498466 A CN103498466 A CN 103498466A
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Abstract
The invention discloses a construction technique for preventing hole collapse of a bored cast-in-place pile. The construction technique for preventing the hole collapse of the bored cast-in-place pile is characterized in that the construction technique comprises the steps that (1) a pile casing is buried in a soil layer according to a pile position control line, and a drilling machine is started to drill after a mud circulating system and the drilling machine are well prepared; (2) normal drilling is carried out in the soil layer, and drilling is stopped and a drill bit is lifted when the drill bit is located in a soft soil layer and it is difficult to continue to drill downwards for the drilling machine; (3) the drilling machine is moved after drilling is stopped, concrete is poured into a drill hole rapidly till the surface of the concrete is higher than the set upper surface of the soft soil layer, and a rigid protective wall is formed after the concrete is solidified; (4) the drill bit is replaced with a rock drill bit; (5) the rock drill bit is replaced with the original excavating drill bit after the rock drill bit penetrates through the concrete located in the soft soil layer to enable rapid drilling to be carried out continuously till a hole is formed. The construction technique for preventing the hole collapse of the bored cast-in-place pile has the advantages that the problem that the lateral supporting force, in the soft soil layer, of a protective wall which is formed only by slurry is insufficient is solved, the hole collapse of soil layers with strong flow plasticity is prevented, and drilling success rate is improved.
Description
Technical field
The present invention relates to filling concrete technique, relate in particular to and a kind ofly in perfusion, during weak concrete, stop the construction technology of bored pile collapse hole.Belong to field of civil engineering.
Background technology
At present, bored pile, in the drilling and forming hole process, generally adopts the mud off mode, to prevent hole wall collapse.
Traditional bored pile master operation comprises: measure unwrapping wire 1.; 2. pore-forming; 3. reinforcing cage hangs; Concrete pouring pile etc., wherein, the pore-forming operation is an important ring in whole operation, it comprises the following steps: (1) slurrying; (2) bury casing underground; (3) rig is in place; (4) creep into; (5) clear hole; (6) whole hole etc.
In boring, by mud is circulated in mud pit, slow stock tank, a stake hole, playing retaining wall, take sand, the effect of cooling drill bit, when creeping into mud, be mainly the speed that keyhole creeps into, that is: cave in hour, can first cleaning bottom of hole, then, then continue boring; In order to improving mud property, bury the Large-diameter Steel casing underground so that when soft layer is more shallow (general 8 meters left and right) prevention hole wall collapse; When hole wall collapse occurs, after being filled on the collapse hole position by cohesive soil, then continue boring.But above-mentioned working procedure is moulded with soft and while moulding the soft layers such as mud, due to retaining wall lateral support power deficiency in soft layer, hole wall collapse is easily occurred running into high current;
Summary of the invention
Main purpose of the present invention is to overcome the above-mentioned shortcoming that prior art exists, and provide a kind of construction technology that stops the bored pile collapse hole, it utilizes the weak concrete of perfusion first to form the mode of rigidity retaining wall, overcome separately by mud as the hypodynamic problem of retaining wall lateral support in soft layer, under weak concrete and mud acting in conjunction, not only stop the collapse hole of the stronger soil layer of stream plasticity, guaranteed carrying out smoothly of pore-forming; And, improved the boring success rate.
The objective of the invention is to be realized by following technical scheme:
A kind of construction technology that stops the bored pile collapse hole is characterized in that: adopt following steps:
The first step: preparation: according to stake position control line, casing is embedded in soil layer, then, that mud circulating system is ready, rig is in place, after meeting the requirement of setting deviation, starts rig, starts boring;
Second step: in soil layer, the drill bit of rig normally creeps into;
(1) in pore forming process, need to supplement in time mud in boring, and maintain head pressure;
(2) work as bit drills and enter in soft layer, when the very difficult continuation of rig is crept into downwards, should resolutely stop creeping into, mention drill bit;
The 3rd step: after rig stops creeping into, by the rig displacement, and, rapidly to the interior penetration concrete of boring, until concrete surface exceeds the upper surface setting height of soft layer, after concrete setting, just formed the rigidity retaining wall;
The 4th step: after concrete setting, change drill bit into rock drill bit, now, concrete jointly plays the retaining wall effect together with mud;
The 5th step: after drill bit is through the concrete that is arranged in weak Soft Soil Layer, then rock drill bit is gained to original shoveling drill bit, continue fast drilling until pore-forming.
Described concrete is low-grade concrete.
In described the 3rd step, in boring during penetration concrete, first insertion conduit and funnel in boring, then, then to penetration concrete in funnel.
Beneficial effect of the present invention: the present invention is owing to adopting technique scheme, it utilizes the weak concrete of perfusion first to form the mode of rigidity retaining wall, overcome separately by mud as the hypodynamic problem of retaining wall lateral support in soft layer, under weak concrete and mud acting in conjunction, not only stop the collapse hole of the stronger soil layer of stream plasticity, guaranteed carrying out smoothly of pore-forming; And, improved the boring success rate.
The accompanying drawing explanation:
Fig. 1 is the rig of the present invention schematic diagram of holing that starts in place.
Fig. 2 is that drill bit of drilling machine of the present invention is through the soft layer schematic diagram.
Fig. 3 is rig displacement of the present invention, inserts catheter perfusion weak concrete schematic diagram.
After Fig. 4 is concrete setting of the present invention, rig is changed the rock drill bit schematic diagram of again holing.
Fig. 5 is that rig of the present invention gains the final pore-forming schematic diagram of former drill bit.
Major label description in figure:
1. casing, 2. mud, 3. rig, 4. drill bit, 5. concrete, 6. funnel, 7. conduit, 8. soil layer, 9. soft layer.
The specific embodiment
The present invention adopts following steps:
The first step: as shown in Figure 1, according to stake position control line, casing 1 is embedded in soil layer 8, then, that mud circulating system is ready, rig 3 is in place, after meeting the requirement of setting deviation, starts rig 3, and the drill bit 4 of rig 3 starts boring;
Second step: as shown in Figure 2, in soil layer 8, the drill bit 4 of rig 3 normally creeps into;
(1) in pore forming process, need to supplement in time mud 2 in boring, make the mud in boring stable, and maintain head pressure, to play good retaining wall effect;
(2) but when drill bit 4 creeps in soft layer 9, because these soft layer 9 stream plasticity are stronger, the independent role of mud 2 can not stop the sidewall collapse hole of boring, and therefore, rig 3 is difficult to continuation and creeps into downwards, now, should resolutely stop creeping into, and mentions drill bit 4;
The 3rd step: as shown in Figure 3, after rig 3 stops creeping into, by rig 3 displacement, and rapidly in boring to pour in boring low-grade concrete 5(as: C15).When in boring, pouring into low-grade concrete 5 concrete, first in boring, insert conduit 7 and funnel 6, then, then pour into until the surface of concrete 5 exceeds the upper surface setting height of soft layer 9 in funnel 6, after concrete 5 solidifies, just formed the rigidity retaining wall;
The 4th step: as shown in Figure 4, after low-grade concrete 5 solidifies, change drill bit 4 into rock drill bit, be beneficial to hole and pass through in low-grade concrete 5, now, low-grade concrete 5 jointly plays the retaining wall effect together with mud 2;
The 5th step: as shown in Figure 5, after drill bit 4 is through the low-grade concrete 5 of Soft Soil Layer 9 a little less than being arranged in, then rock drill bit is gained to original shoveling drill bit, continue fast drilling until pore-forming.
Above-mentioned casing, mud, rig, drill bit, concrete, funnel, conduit are prior art, and the technology of not specified (NS) is prior art.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all still belong in the scope of technical solution of the present invention.
Claims (3)
1. a construction technology that stops the bored pile collapse hole is characterized in that: adopt following steps:
The first step: preparation: according to stake position control line, casing is embedded in soil layer, then, that mud circulating system is ready, rig is in place, after meeting the requirement of setting deviation, starts rig, starts boring;
Second step: in soil layer, the drill bit of rig normally creeps into;
(1) in pore forming process, need to supplement in time mud in boring, and maintain head pressure;
(2) work as bit drills and enter in soft layer, when the very difficult continuation of rig is crept into downwards, should resolutely stop creeping into, mention drill bit;
The 3rd step: after rig stops creeping into, by the rig displacement, and, rapidly to the interior penetration concrete of boring, until concrete surface exceeds the upper surface setting height of soft layer, after concrete setting, just formed the rigidity retaining wall;
The 4th step: after concrete setting, change drill bit into rock drill bit, now, concrete jointly plays the retaining wall effect together with mud;
The 5th step: after drill bit is through the concrete that is arranged in weak Soft Soil Layer, then rock drill bit is gained to original shoveling drill bit, continue fast drilling until pore-forming.
2. the construction technology of prevention bored pile collapse hole according to claim 1, it is characterized in that: described concrete is low-grade concrete.
3. the construction technology of prevention bored pile collapse hole according to claim 1 is characterized in that: in described the 3rd step, and when penetration concrete in boring, first insertion conduit and funnel in boring, then, then to penetration concrete in funnel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310491749.6A CN103498466A (en) | 2013-10-18 | 2013-10-18 | Construction technique for preventing hole collapse of bored cast-in-place pile |
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| CN201310491749.6A CN103498466A (en) | 2013-10-18 | 2013-10-18 | Construction technique for preventing hole collapse of bored cast-in-place pile |
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| CN103498466A true CN103498466A (en) | 2014-01-08 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060604A (en) * | 2014-05-29 | 2014-09-24 | 国鼎(南通)管桩有限公司 | Construction method for bored pile |
| CN105568961A (en) * | 2015-12-28 | 2016-05-11 | 中国电建集团贵阳勘测设计研究院有限公司 | Hole forming method for soft plastic red clay stratum pile foundations |
| CN105862861A (en) * | 2016-06-13 | 2016-08-17 | 上海强劲地基工程股份有限公司 | Rigid-pile embedding device and construction method |
| CN105952374A (en) * | 2016-05-06 | 2016-09-21 | 中国水利水电第十工程局有限公司 | Complex soil layer anchor cable hole drill pore-forming method |
| CN107090821A (en) * | 2017-05-10 | 2017-08-25 | 中国十七冶集团有限公司 | A kind of processing method of churning driven drilling landslide |
| CN107268608A (en) * | 2017-06-06 | 2017-10-20 | 中铁十九局集团轨道交通工程有限公司 | Building waste earth-boring stake forming hole method |
| CN107905728A (en) * | 2017-11-15 | 2018-04-13 | 中国水利水电第十六工程局有限公司 | Rockfill area drilling construction method |
| CN110374093A (en) * | 2019-07-16 | 2019-10-25 | 深圳市市政工程总公司 | High pressure-bearing crevice water earth-boring cast-in-place pile construction method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060604A (en) * | 2014-05-29 | 2014-09-24 | 国鼎(南通)管桩有限公司 | Construction method for bored pile |
| CN105568961A (en) * | 2015-12-28 | 2016-05-11 | 中国电建集团贵阳勘测设计研究院有限公司 | Hole forming method for soft plastic red clay stratum pile foundations |
| CN105952374A (en) * | 2016-05-06 | 2016-09-21 | 中国水利水电第十工程局有限公司 | Complex soil layer anchor cable hole drill pore-forming method |
| CN105952374B (en) * | 2016-05-06 | 2019-02-05 | 中国水利水电第十一工程局有限公司 | A kind of complex random systems prestressed anchor cable borehole forming hole method |
| CN105862861A (en) * | 2016-06-13 | 2016-08-17 | 上海强劲地基工程股份有限公司 | Rigid-pile embedding device and construction method |
| CN105862861B (en) * | 2016-06-13 | 2018-03-23 | 上海强劲地基工程股份有限公司 | A plant pile construction method |
| CN107090821A (en) * | 2017-05-10 | 2017-08-25 | 中国十七冶集团有限公司 | A kind of processing method of churning driven drilling landslide |
| CN107268608A (en) * | 2017-06-06 | 2017-10-20 | 中铁十九局集团轨道交通工程有限公司 | Building waste earth-boring stake forming hole method |
| CN107905728A (en) * | 2017-11-15 | 2018-04-13 | 中国水利水电第十六工程局有限公司 | Rockfill area drilling construction method |
| CN107905728B (en) * | 2017-11-15 | 2020-01-14 | 中国水利水电第十六工程局有限公司 | Rock-fill area drilling construction method |
| CN110374093A (en) * | 2019-07-16 | 2019-10-25 | 深圳市市政工程总公司 | High pressure-bearing crevice water earth-boring cast-in-place pile construction method |
| CN110374093B (en) * | 2019-07-16 | 2021-07-06 | 深圳市市政工程总公司 | Construction method of cast-in-situ bored pile for high-pressure-bearing fractured water stratum |
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Application publication date: 20140108 |