CN104153352A - Karst geology rotary-drilling bored concrete pile hole forming process - Google Patents

Karst geology rotary-drilling bored concrete pile hole forming process Download PDF

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Publication number
CN104153352A
CN104153352A CN201410376534.4A CN201410376534A CN104153352A CN 104153352 A CN104153352 A CN 104153352A CN 201410376534 A CN201410376534 A CN 201410376534A CN 104153352 A CN104153352 A CN 104153352A
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pile
hole
concrete
drilling
conduit
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CN201410376534.4A
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CN104153352B (en
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王家全
黄柳云
朱庆盛
吴辉琴
黄世斌
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广西科技大学
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Abstract

The invention discloses a karst geology rotary-drilling bored concrete pile hole forming process which includes the steps of 1, leveling a field; 2, paying off at a pile foundation; 3, setting a rotary drilling machine in place; 4, embedding a pile casing; 5, preparing mud stabilizing liquid and filling the mud stabilizing liquid into the pile casing; 6, forming holes by means of rotary drilling (with requirements of reducing drilling speed when drilling in karst caves or half rocks, otherwise, drilling to reach designed elevation ); 7, performing primary cleaning of holes and hole depth checking; 8, mounting a reinforced cage and a conduit; 9, performing secondary cleaning through air-lift reverse circulation; 10, pouring underwater concrete (while preparing extra 30-40 cubic meters of concrete with consideration of karst caves so as to prevent pile scrap caused by breakdown of the karst caves and sharp sinking of concrete); and 11, forming a pile and removing the pile casing.

Description

A kind of Karst Geological Landscape revolves and digs pouring pile hole technique

Technical field

The present invention relates to a kind of pile foundation construction process, specifically, relate to a kind of Karst Geological Landscape and revolve and dig pouring pile hole technique.

Background technology

Rotary digging drilling hole bored concrete pile construction technology is the pile foundation construction process of rising in recent years.At present, existing rotary digging drilling hole bored concrete pile construction technology is: smooth location → stake position unwrapping wire → rotary drilling rig is in place → and bury underground and in casing → casing, supplement stabilizing solution → revolve and scrape out hole → clear hole, check hole depth → installation reinforcing cage and conduit → secondary pile hole cleaning → build underwater concrete → pile, extract casing.Existing construction technology quality control standard and construction technology technical standard also do not have concrete national engineering method standard.Existing construction technology is for general geological condition, to there will be different problems if indiscriminately imitate the rotary digging drilling hole bored concrete pile construction technology of general geology in the comparatively complicated karst area of geological condition, topmost problem has that hole scattering, bit freezing, drill bit drop, clear hole not thoroughly and occur broken pile and useless stake phenomenon etc.During due to rig installation in position poor stability, operation, rig is installed shakiness or drill pipe buckling, ground weakness or soft or hard be inhomogeneous etc. that reason causes hole scattering; Due to the existence of solution cavity and half rock, dig while creeping into and do not note if revolve, will cause the problems such as bit freezing or drill bit drop; Karst region is revolved and is dug the carg producing in pore forming process than many in general geology, will there will be clearly thorough phenomenon of hole by general clear hole mode, thereby can cause pile bottom sediment more, has a strong impact on the quality of pile foundation; Due to the existence of solution cavity, in the time of concreting, may occur that solution cavity is breakdown, cause concrete sharply to decline, thereby occur broken pile and useless stake phenomenon.

Summary of the invention

In order to overcome the defect existing in prior art, the present invention proposes a kind of Karst Geological Landscape and revolve and dig pouring pile hole technique.Its technical scheme is as follows:

A kind of Karst Geological Landscape revolves and digs pouring pile hole technique, comprises the following steps:

1) levelling of the land.Construction before removing obstacles, change except weak soil, grinding compacting.Planning travelling line, makes road and bore position maintain a certain distance (avoid affecting wall stability, also should consider to clear in rotary digging drilling hole construction the convenience of the earthwork simultaneously);

2) pile foundation unwrapping wire, rotary drilling rig are in place.Adopt total powerstation to position unwrapping wire, the control of unwrapping wire error is less than 1cm.Position of p ile machine is wanted accurately, and rig center of pilot line, turntable center line, pile foundation center line should remain on same straight line;

3) bury casing underground.Draw cross hairs to put four according to pile foundation anchor point and control stake, control stake bury steel sheath cylinder underground as benchmark taking four, the high 2m that is generally not less than of cylinder, for protection hole wall, bassets and is highly generally not less than 0.3m;

4) in the preparation of mud stabilizing solution and casing, supplement mud stabilizing solution.In the rotary digging drilling hole process of karst region, boring mud is more, so it is very crucial to control the proportion of mud stabilizing solution, controls mud balance and be not less than 1.1, and viscosity 20s left and right, sand factor is less than 4%;

5) revolve and dig drilling and forming hole.While running into solution cavity or half rock, to slow down rate of penetration (caning be controlled in 10~20mm/min), while not running into solution cavity or half rock, be drilled into design elevation;

6) once clear hole, check hole depth.First drill bit is increased to apart from 80~100mm at the bottom of hole, the new mud stabilizing solution that input proportion is 1.05~1.08 circulates, and carries out hole clearly with pressure fan;

7) reinforcing cage and conduit are installed;

8) gas lift reverse circulation secondary pile hole cleaning.The clear hole of anti-circulation secondary makes boring mud cleaning comparatively thorough, and pile bottom sediment is few, and pile quality obviously improves, and has greatly shortened the clear hole time, improved pore-forming efficiency;

9) build underwater concrete.Conduit must be tight, ensures 30~50cm at the bottom of conduit bottom is apart from hole; Mixing concrete must be evenly, and the slump is controlled at 18~22cm, and will ensure a certain amount of concrete first watering amount, ensures back cover success; Concreting must be worked continuously; In casting process, should there is special messenger to be responsible for record, avoid conduit to promote too fast or conduit and imbedded deeply, control the conduit end opening Transducers Embedded in Concrete degree of depth 2~6m, prevent broken pile; The end face absolute altitude of castinplace pile should be than the high 60cm that is not less than of design load, to guarantee the concrete quality in stake top;

10) pile, extract casing.

Use to revolve to dig under the more general geological condition of construction process of bored concrete pile at Karst Geological Landscape and use and can do following optimization: (1) is revolved and dug in drilling process at Karst Geological Landscape, enter uneven strata, oblique shape rock stratum or encounter solution cavity or when half rock, slow down rate of penetration (caning be controlled in 10~20mm/min), keep the verticality of kelly, avoid bit freezing or drill bit to drop.In the time of hole scattering, can mention drill bit, repeatedly sweep brill several times up and down.Be oblique shape distribution if accompany large boulder or solution cavity in soil layer, pour into C15 concrete to more than the inclined to one side hole 0.5m of place, after concrete final set, again creep into, (2) in Karst Geological Landscape pore-forming after-pouring formation of pile, should select comparatively complicated (probably having solution cavity) two piles of geological condition according to geologic report and carry out filling concrete pile, when solution cavity may be breakdown under high pressure effect, thereby there is the concrete phenomenon that sharply declines, cause this stake to become useless stake, can shift to an earlier date 30~40 cubes of concrete of preparing according to a large amount of site operation experiences more, (known according to a large amount of site operation experiences, if aperture does not have mud to return out in concrete perfusion, just explanation has the existence of solution cavity), while there is this phenomenon, can supplement in time concrete, what need pay special attention to is, the conduit of now necessarily can not being eager to pull out, avoid conduit to extract and just start to occur that concrete sharply declines afterwards, now just there will be conduit above concrete, thereby cause useless stake.

Beneficial effect of the present invention is:

The present invention improves existing rotary digging drilling hole bored concrete pile construction technology, is more suitable for the comparatively complicated karst area of geological condition after improvement, can improve karst area and revolve the pile efficiency of digging castinplace pile.Improved technology solves deflection problem timely when can effectively avoiding hole scattering and occurring drilling rod deflection; Can effectively avoid revolving the bit freezing that occurs in drilling process and the drill bit problem that drops of digging; Can effectively avoid thoroughly not causing the blocked up bearing capacity of pile foundation that affects of sediment because of clear hole; Can effectively avoid making pile foundation become useless stake because solution cavity existence causes concrete sharply to decline.

Brief description of the drawings

Fig. 1 is that Karst Geological Landscape of the present invention revolves and digs pouring pile hole technological process;

Fig. 2 is underwater concreting mode;

Fig. 3 is hopper switch;

Fig. 4 is concrete first watering schematic diagram.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in more detail.

With reference to Fig. 1, the technical solution adopted for the present invention to solve the technical problems is: karst region is improved revolves the construction technology process that scrapes out hole pouring pile and be: smooth location → stake position unwrapping wire → rotary drilling rig is in place → and bury underground and in casing → casing, supplement stabilizing solution → revolve and scrape out hole and (while running into solution cavity, will slow down rate of penetration, while not running into solution cavity, be drilled into design elevation) → clear hole, check hole depth → installations reinforcing cage and conduit → gas lift reverse circulation secondary pile hole cleaning → the build underwater concrete (existence of consideration solution cavity, need 30~40 cubes of concrete of preparing more, prevent that solution cavity from puncturing, concrete sharply declines and causes useless stake) → pile, extract casing.

For fear of hole scattering in drilling process, when rigging up, require on Spiral digging machine center of turntable and drilling cramp lifting pulley at same axis, drilling rod position deviation is not more than 20cm, when entering uneven strata, oblique shape rock stratum or encountering half rock, slow down rate of penetration.In the time of hole scattering, can mention drill bit, repeatedly sweep brill several times up and down.Be oblique shape distribution if accompany large boulder or solution cavity in soil layer, pour into C15 concrete to more than the inclined to one side hole 0.5m of place, after concrete final set, again creep into.

Adopt in the comparatively complicated karst area of geological condition and revolve the existing problems that need to consider solution cavity while digging pouring pile hole construction technology, dig in pore forming process revolving, when revolving when digging drill bit and running into solution cavity or half rock, must slow down rate of penetration, keep the verticality of kelly, avoid bit freezing or drill bit to drop.

Clear hole work after pore-forming is very crucial, sediment is blocked up at the bottom of because of hole tends to cause bearing capacity reduction for rotary digging drilling hole bored concrete pile, have a strong impact on the quality of pile foundation, karst region is revolved and is dug the carg producing in pore forming process than many in general geology, to be difficult to clear hole by general clear hole mode thorough, thereby can cause pile bottom sediment more, therefore revolving of karst region dug castinplace pile and adopted in time " gas lift reverse circulation " to carry out secondary pile hole cleaning putting into after reinforcing cage, carries out in time concreting and will solve well the too much problem of pile bottom sediment behind clear hole.

While building underwater concrete first, guarantee that conduit has buried depth more than 1m, concrete first watering amount is calculated schematic diagram as shown in Figure 4, and first watering amount is as follows with reference to design formulas:

V ≥ π D 2 ( H 1 + H 2 ) 4 + π d 2 h 1 4

In formula: V-concrete first watering amount (m 3);

D-stake bore dia (m);

H 1the distance (m) of bottom, Dao Zhuan hole ,-conduit bottom, is generally 0.4~0.5m;

H 2the degree of depth (m) of-first placing of concrete rear tube Transducers Embedded in Concrete, more than being generally 1m;

H 1-stake hole inner concrete reaches H 2time, the outer required height (m) of mud pressure of conduit inner concrete column equilibration conduit;

Conduit has buried depth more than 1m when building underwater concrete first, underwater concreting adopts device as shown in Figure 2 to build, while building, concrete hopper is sling by hoist cable with crane, conduit and hopper connect, build and frontly with hopper switch (as shown in Figure 3), hopper cuts out, (general hopper is 3m to treat to fill hopper by concrete 3left and right, a stake footpath while being greater than 2.7m with two hoppers that stack) after again by hopper switch opens, concrete, under the effect of gravity, sweeps away and can complete first watering back cover along conduit.In Fig. 3, hopper switch is made up of a steel disk and gusseted, before hopper dress concrete, put down hopper switch, gusseted is enclosed within and in conduit mouth, plays a fixation, in the middle of steel disk, connect with hoist cable, in the time that concrete is filled hopper, with loop wheel machine, steel disk is sling, concrete can sweep away and can complete first watering back cover along conduit.

In perfusion bore forming process, should select and probably exist two piles of solution cavity to carry out filling concrete pile according to geologic report, when solution cavity may be breakdown under high pressure effect, thereby there is the concrete phenomenon that sharply declines, cause this stake to become useless stake, can shift to an earlier date 30~40 cubes of concrete of preparing according to a large amount of site operation experiences more, (known according to a large amount of site operation experiences, if aperture does not have mud to return out in concrete perfusion, just explanation has the existence of solution cavity), while there is this phenomenon, can supplement in time concrete, what need pay special attention to is, the conduit of now necessarily can not being eager to pull out, avoid conduit to extract and just start to occur that concrete sharply declines afterwards, now just there will be conduit above concrete, thereby cause useless stake, taking this measure can improve to a certain extent karst region revolves and digs filling pile construction benefit.

The above; it is only preferably detailed description of the invention of the present invention; protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in, the simple change of the technical scheme that can obtain apparently or equivalence replace all fall within the scope of protection of the present invention.

Claims (1)

1. Karst Geological Landscape revolves and digs a pouring pile hole technique, it is characterized in that, comprises the following steps:
1) levelling of the land: construction before removing obstacles, change except weak soil, grinding compacting; Planning travelling line, maintains a certain distance road and bore position;
2) pile foundation unwrapping wire, rotary drilling rig are in place: adopt total powerstation to position unwrapping wire, the control of unwrapping wire error is less than 1cm; Position of p ile machine is wanted accurately, and rig center of pilot line, turntable center line, pile foundation center line should remain on same straight line;
3) bury casing underground: draw cross hairs to put four according to pile foundation anchor point and control stake, control stake bury steel sheath cylinder underground as benchmark taking four, the high 2m that is generally not less than of cylinder, for protection hole wall, bassets and be highly generally not less than 0.3m;
4) in the preparation of mud stabilizing solution and casing, supplement mud stabilizing solution: in the rotary digging drilling hole process of karst region, boring mud is more, so it is very crucial to control the proportion of mud stabilizing solution, controls mud balance and be not less than 1.1, viscosity 20s left and right, sand factor is less than 4%;
5) revolve and dig drilling and forming hole: while running into solution cavity or half rock, will slow down rate of penetration and be controlled at 10~20mm/min, while not running into solution cavity or half rock, be drilled into design elevation;
6) once clear hole, check hole depth: first drill bit is increased to apart from 80~100mm at the bottom of hole, the new mud stabilizing solution that input proportion is 1.05~1.08 circulates, and carries out hole clearly with pressure fan;
7) reinforcing cage and conduit are installed;
8) gas lift reverse circulation secondary pile hole cleaning;
9) build underwater concrete: conduit must be tight, ensure 30~50cm at the bottom of conduit bottom is apart from hole; Mixing concrete must be evenly, and the slump is controlled at 18~22cm, and concreting must be worked continuously; In casting process, should there is special messenger to be responsible for record, avoid conduit to promote too fast or conduit and imbedded deeply, control the conduit end opening Transducers Embedded in Concrete degree of depth 2~6m, prevent broken pile; The end face absolute altitude of castinplace pile should be than the high 60cm that is not less than of design load;
10) pile, extract casing.
CN201410376534.4A 2014-07-31 2014-07-31 Karst geology rotary-drilling bored concrete pile hole forming process CN104153352B (en)

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Cited By (12)

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Publication number Priority date Publication date Assignee Title
CN104674780A (en) * 2015-02-06 2015-06-03 中鼎国际工程有限责任公司 Karst stratum stabilization structure
CN104831708A (en) * 2015-03-20 2015-08-12 深圳市工勘岩土集团有限公司 Foundation excavation retaining and protecting cast-in-situ bored pile construction method and equipment thereof
CN105714772A (en) * 2016-02-22 2016-06-29 北龙建设集团有限公司 Re-drilling concrete wall protecting method for hole formation of rock-socketed pile in karst region
CN106522209A (en) * 2016-10-08 2017-03-22 金陵科技学院 Perfusion construction method of cast-in-situ bored pile for revolving-boring construction of karst cave
CN106836206A (en) * 2017-03-30 2017-06-13 重庆建工住宅建设有限公司 Casing rotary digging bore forming method
CN106930276A (en) * 2017-04-11 2017-07-07 广州智弘建筑物检测与鉴定技术有限公司 The deep hole blasting of rotary digging bored concrete pile and the construction method of conduit rotary digging removing obstacles
CN107246006A (en) * 2017-06-29 2017-10-13 深圳市蛇口招商港湾工程有限公司 Concrete-pile reinforcement cage structure and pile-filling method
CN107386276A (en) * 2017-07-20 2017-11-24 广州市建筑科学研究院新技术开发中心有限公司 A kind of construction method of soft layer super-long and large-diameter bored piles
CN108049397A (en) * 2017-12-22 2018-05-18 中交第三航务工程局有限公司宁波分公司 The construction method of Karst Geological Landscape drilled pile
CN108086342A (en) * 2017-12-22 2018-05-29 中交第三航务工程局有限公司宁波分公司 The construction method of karst strata pile foundation
CN108487286A (en) * 2018-02-06 2018-09-04 广州市市政工程设计研究总院 A kind of construction method of the continuous supporting course of beading karst region super long pile
CN110080785A (en) * 2019-05-16 2019-08-02 中铁隧道局集团有限公司 Compound stratum super-large-diameter shield normal pressure warehouse entry reinforced construction method near water

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CN109056709A (en) * 2018-08-22 2018-12-21 中铁二十二局集团有限公司 A method of using full-sleeve hydraulic drill rig construction In Karst Areas For Bridge pile foundation

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104674780A (en) * 2015-02-06 2015-06-03 中鼎国际工程有限责任公司 Karst stratum stabilization structure
CN104831708A (en) * 2015-03-20 2015-08-12 深圳市工勘岩土集团有限公司 Foundation excavation retaining and protecting cast-in-situ bored pile construction method and equipment thereof
CN105714772B (en) * 2016-02-22 2018-04-03 北龙建设集团有限公司 Karst area embedded rock pile pore-forming bores concrete dado method again
CN105714772A (en) * 2016-02-22 2016-06-29 北龙建设集团有限公司 Re-drilling concrete wall protecting method for hole formation of rock-socketed pile in karst region
CN106522209A (en) * 2016-10-08 2017-03-22 金陵科技学院 Perfusion construction method of cast-in-situ bored pile for revolving-boring construction of karst cave
CN106836206A (en) * 2017-03-30 2017-06-13 重庆建工住宅建设有限公司 Casing rotary digging bore forming method
CN106930276A (en) * 2017-04-11 2017-07-07 广州智弘建筑物检测与鉴定技术有限公司 The deep hole blasting of rotary digging bored concrete pile and the construction method of conduit rotary digging removing obstacles
CN107246006A (en) * 2017-06-29 2017-10-13 深圳市蛇口招商港湾工程有限公司 Concrete-pile reinforcement cage structure and pile-filling method
CN107246006B (en) * 2017-06-29 2019-11-05 深圳市蛇口招商港湾工程有限公司 The pile-filling method of concrete-pile
CN107386276A (en) * 2017-07-20 2017-11-24 广州市建筑科学研究院新技术开发中心有限公司 A kind of construction method of soft layer super-long and large-diameter bored piles
CN108049397A (en) * 2017-12-22 2018-05-18 中交第三航务工程局有限公司宁波分公司 The construction method of Karst Geological Landscape drilled pile
CN108086342A (en) * 2017-12-22 2018-05-29 中交第三航务工程局有限公司宁波分公司 The construction method of karst strata pile foundation
CN108487286A (en) * 2018-02-06 2018-09-04 广州市市政工程设计研究总院 A kind of construction method of the continuous supporting course of beading karst region super long pile
CN110080785A (en) * 2019-05-16 2019-08-02 中铁隧道局集团有限公司 Compound stratum super-large-diameter shield normal pressure warehouse entry reinforced construction method near water

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