CN104878762A - Bored pile construction method suitable for tilt hard rock section - Google Patents
Bored pile construction method suitable for tilt hard rock section Download PDFInfo
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- CN104878762A CN104878762A CN201510248001.2A CN201510248001A CN104878762A CN 104878762 A CN104878762 A CN 104878762A CN 201510248001 A CN201510248001 A CN 201510248001A CN 104878762 A CN104878762 A CN 104878762A
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Abstract
The invention belongs to the technical field of foundation pit construction, and particularly relates to a bored pile construction method suitable for a tilt hard rock section. The invention provides the bored pile construction method suitable for the tilt hard rock section, in order to rapidly and accurately construct bored piles, ensure the construction progress and avoid the problem of tilt of the bored piles when constructing the tilt hard rock section; a method of interval construction is adopted, a rotary drilling rig and a geological drill are subjected to joint construction, a method for using the geological drill to construct stress release holes first and then using the rotary drilling rig to construct the bored piles is adopted to release the rock stress, and meanwhile, the constructed stress release holes play a guide role in the construction of the rotary drilling rig so as to avoid the hole misregistration during the construction of the rotary drilling rig. With adoption of the bored pile construction method, the construction progress is accelerated obviously, and the economic benefits are significant.
Description
Technical field
The invention belongs to the technical field of foundation pit construction, be specifically related to one and be applicable to inclination solid rock location drilled pile construction method.
Background technology
Space enclosing structure construction in foundation pit construction is the critical process in whole engineering, and the efficiency therefore improving drilled pile pore-forming is the key of reduction of erection time.Ensure that the precision of pore-forming in inclination solid rock and quality are one of keys ensureing drilled pile quality simultaneously.
In construction foundation pit, be provided with suitable rich experience both at home and abroad at present, stake machine is rushed in main employing or rotary drilling rig carries out drilling construction, rush stake machine better for relatively weak location effect, but the rock location speed of application larger for intensity is quite slow, rotary drilling rig is relatively better in hard rock location construction drill stake effect, but the situation construction reaching more than 50Mpa in intensity is relatively slow, when adopting construction in inclination solid rock location simultaneously, be easy to occur inclined hole phenomenon, be difficult to the verticality ensureing drilled pile, bring hidden danger to construction quality.
Summary of the invention
The present invention, in order to when Construction of Inclined solid rock location, can construct to drilled pile accurately fast, ensures the progress of construction, prevents the problem that drilled pile tilts, provides one and be applicable to inclination solid rock location drilled pile construction method.
The present invention adopts following technical scheme:
One is applicable to inclination solid rock location drilled pile construction method, adopts the method for interval construction, and bore associating construction by rotary drilling rig and geology, concrete steps are as follows:
A, first according to designing requirement at the place surveying setting-out needing construction, dividing pile element, is a construction cell with every platform rotary drilling rig 20 pile, and at the bore position of the some stress relief holes be evenly arranged of each stake internal labeling;
B, reserve bore operation space along the arranged direction of stake, lay steel plate, put on steel plate by geological drilling rig, then carry out the installation of geology brill and adjust verticality in construction cell both sides, the stress relief hole of first stake internal labeling of then constructing is to projected depth;
C, after all stress relief holes in first stake have been constructed, remove geology to bore, rotary drilling rig is put on steel plate, be adjusted to after level each stress relief hole drilling and forming hole, in drilling process, in order to avoid there is inclined hole phenomenon, the drilling rod of rotary drilling rig need be kept vertical, the soft rock strata that compressive strength is less than 20MPa adopts high rotating speed high pulling torque to creep into, compressive strength is the soft or hard layer intersection of 20 ~ 50MPa, employing low rotation speed large torque creeps into, and when reaching the inclination competent bed of more than 50MPa, adopts high-speed little moment of torsion to creep into;
After D, stress relief hole pore-forming in first stake complete, utilize hydraulic grab to dig stake, dig in a process smooth degree ensured in stake, then carry out hole grouting clearly, complete the construction to first stake;
E, after first pile driving construction completes, then by the stake that the method for three stakes in interval is constructed in same construction cell successively, repeat the construction stress release aperture of above-mentioned B-D step, pore-forming, dig stake, clear hole filling process completes construction to each.
Described steel plate paving location distance construction unit side at least 2m.
Described high rotating speed refers to the rotating speed of more than 20 revs/min, and the slow-speed of revolution refers to the rotating speed lower than 20 revs/min.
Described high pulling torque refers to that the unit head moment of torsion of rotary drilling rig is more than 210KN.m, and little moment of torsion refers to that the unit head moment of torsion of rotary drilling rig is less than 210KN.m.
The area sum in described each stake internal stresses release hole accounts for the 2%-3% of corresponding stake area.
Stress relief hole in described stake presses five-point type quincuncial arrangement.
Stress relief hole in described stake is arranged around the center of circle annular array of stake.
Stress relief hole in described stake is arranged by box formation.
The present invention has following beneficial effect:
1, the present invention is bored by geology and rotary drilling rig combines construction, geology is adopted to bore first construction stress release aperture, again by the method for rotary drilling rig construction drill stake (pore-forming), its rate of penetration can reach stable 1m/h, and the mode of creeping into of former independent employing rotary drilling rig, its rate of penetration average out to 0.3 ~ 0.5m/h, contrasts known construction speed of the present invention and is more than doubled;
2, economic benefit aspect: for certain conventional project, boring (stake) degree of depth is 30m, wherein solid rock average thickness reaches 14m, when independent employing rotary drilling rig drills through hard rock part, average 0.3 ~ the 0.5m/h of rate of penetration, this part of constructing approximately 35h, the about 450 yuan/h of construction oil consumption, oil consumption adds up to 15750 yuan; First adopt geology to bore and first drill through cellular pre-ceasma (stress relief hole), then when using rotary drilling rig drilled as holes, rate of penetration reaches stable 1m/h, construction hard rock part needs 14h, and oil consumption adds up to 6300 yuan; To sum up, become a pile to save time 21h, save oil consumption 9450 yuan, the hole stake of this project space enclosing structure amounts to 749, then add up to the 15729h that saves time, and saves oil consumption 707.8 ten thousand yuan, economic benefit and social benefit obvious;
3, the present invention is bored by geology and rotary drilling rig combines construction, geology is adopted to bore first construction stress release aperture, again by the method for rotary drilling rig construction drill stake (pore-forming), rock stress is played to the effect of release, the stress relief hole of simultaneously having constructed plays guide effect to rotary drilling rig construction, inclined hole phenomenon is there is when avoiding rotary drilling rig construction, solve and construct slowly and the problem in easy hole partially in the drilled pile process of inclination solid rock location, reach the object of quick, accurate construction;
4, the present invention can adjust rotating speed and the moment of torsion of drilling machine drilling rod in real time in work progress according to geological condition, reduces phenomenon rotary drilling rig jack-up being occurred inclined hole in the high pressure situation of solid rock location, reduces the loss of machine simultaneously;
5, construction method of the present invention is simple, and operation conversion is connected simple, controlled, and existing construction technology and equipment Foundations can improve popularization.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the present invention adopts quincuncial arrangement stress relief hole;
Fig. 2 is that the present invention adopts annular array to arrange the schematic diagram of stress relief hole;
Fig. 3 is that the present invention adopts box formation to arrange the schematic diagram of stress relief hole;
In figure: 1-construction cell, 2-stress relief hole, 3-stake, 4-steel plate.
Detailed description of the invention
By reference to the accompanying drawings, the specific embodiment of the present invention is described further:
The present invention adopts interval method to construct to stake, and bore associating construction by rotary drilling rig and geology, detailed process is:
First according to the place surveying setting-out of designing requirement in needs construction, divide pile element, be a construction cell 1 with every platform rotary drilling rig 20 pile 3, and in each stake 3 bore position of the some stress relief holes 2 be evenly arranged of uniform labelling, the diameter of stress relief hole is 80mm.Wherein, quantity and the arrangement of stress relief hole 2 are various, general quantity is no less than 5, and the area sum in each stake internal stresses release hole accounts for the 2%-3% of corresponding stake area, stress relief hole plays the effect of release to rock stress, accelerate the progress (ordinary circumstance can be enhanced about more than once effect) of construction, the stress relief hole of simultaneously having constructed plays guide effect to rotary drilling rig construction, inclined hole phenomenon is there is when avoiding rotary drilling rig construction, 5 stress relief holes are as shown in Figure 1 by quincuncial arrangement, Fig. 2 is that 8 stress relief holes are arranged around the center of circle annular array of stake, shown in Fig. 39 stress relief hole arranges by the square formation of 3*3.
Then the position laying depth beyond construction cell 1 both sides 2m is the steel plate 4 of 20mm, geological drilling rig is put on steel plate 4, geology is made to bore uniform force, stability in maintenance work, carry out the installation of geology brill again and adjust verticality, the stress relief hole of construction first stake internal labeling is to projected depth, if the drilled pile degree of depth exceedes under competent bed, then the degree of depth of stress relief hole will reach bottom solid rock, if the drilled pile degree of depth is on competent bed, then the degree of depth of stress relief hole will reach bottom drilled pile.
After all stress relief holes in first stake have been constructed, remove geology to bore, rotary drilling rig is put on steel plate, be adjusted to after level each stress relief hole drilling and forming hole, in drilling process, in order to avoid there is inclined hole phenomenon, the drilling rod of rotary drilling rig need be kept vertical, the soft rock strata that compressive strength is less than 20MPa adopts the high rotating speed of 20 revs/min, the high pulling torque of 210KN.m creeps into, compressive strength is the soft or hard layer intersection of 20 ~ 50MPa, adopt the slow-speed of revolution of 18 revs/min, the high pulling torque of 210KN.m creeps into, when reaching the inclination competent bed of more than 50MPa, adopt the high speed of 20 revs/min, the little moment of torsion of 190KN.m creeps into.This method according to geology intensity adjustment drilling machine drilling rod rotating speed and moment of torsion (pressure) reduces phenomenon rotary drilling rig jack-up being occurred inclined hole in the high pressure situation of solid rock location, reduces the loss of equipment etc. simultaneously.Wherein, the verticality of rotary drilling rig can be adjusted in real time, avoids the inclination of grooving, ensure that the verticality (verticality can remain on more than 1/300) of grooving in inclination rock mass.
After stress relief hole pore-forming in first stake completes, utilize hydraulic grab to dig stake, dig in a process smooth degree ensured in stake, then carry out hole grouting clearly, complete the construction to first stake.
Again by the stake that the method for three stakes in interval is constructed in same construction cell successively, construction method is with the work progress of first stake identical (construction stress release aperture, pore-forming, dig stake, the grouting of clear hole).The method of this interval construction contributes to reducing previous construction stake to the impact in follow-up pile driving construction process, avoids and occurs that stress such as to concentrate at the problem.
Equipment or the component of not making specified otherwise in the present invention are prior art.
Claims (8)
1. be applicable to an inclination solid rock location drilled pile construction method, it is characterized in that the method adopting interval construction, bore associating construction by rotary drilling rig and geology, concrete steps are as follows:
A, first according to designing requirement need construction place surveying setting-out, divide pile element, be a construction cell (1) with every platform rotary drilling rig 20 pile (3), and at the bore position of the some stress relief holes (2) be evenly arranged of each stake (3) internal labeling;
B, reserve bore operation space along the arranged direction of stake (3), steel plate (4) is laid in construction cell (1) both sides, geological drilling rig is put on steel plate (4), carry out the installation of geology brill again and adjust verticality, the stress relief hole (2) of first stake internal labeling of then constructing is to projected depth;
C, after all stress relief holes (2) in first stake have been constructed, remove geology to bore, rotary drilling rig is put on steel plate (4), be adjusted to after level each stress relief hole (2) drilling and forming hole, in drilling process, in order to avoid there is inclined hole phenomenon, the drilling rod of rotary drilling rig need be kept vertical, the soft rock strata that compressive strength is less than 20MPa adopts high rotating speed high pulling torque to creep into, compressive strength is the soft or hard layer intersection of 20 ~ 50MPa, employing low rotation speed large torque creeps into, and when reaching the inclination competent bed of more than 50MPa, adopts high-speed little moment of torsion to creep into;
After stress relief hole (2) pore-forming in D, first stake completes, utilize hydraulic grab to dig stake, dig in a process smooth degree ensured in stake, then carry out hole grouting clearly, complete the construction to first stake;
E, after first pile driving construction completes, then by the stake that the method for three stakes in interval is constructed in same construction cell successively, repeat the construction stress release aperture of above-mentioned B-D step, pore-forming, dig stake, clear hole filling process completes construction to each stake (3).
2. be according to claim 1ly applicable to inclination solid rock location drilled pile construction method, it is characterized in that: described steel plate (4) paving location distance construction unit (1) side at least 2m.
3. be according to claim 1ly applicable to inclination solid rock location drilled pile construction method, it is characterized in that: described high rotating speed refers to the rotating speed of more than 20 revs/min, and the slow-speed of revolution refers to the rotating speed lower than 20 revs/min.
4. be according to claim 1ly applicable to inclination solid rock location drilled pile construction method, it is characterized in that: described high pulling torque refers to that the unit head moment of torsion of rotary drilling rig is more than 210KN.m, little moment of torsion refers to that the unit head moment of torsion of rotary drilling rig is less than 210KN.m.
5. be according to claim 1ly applicable to inclination solid rock location drilled pile construction method, it is characterized in that: the area sum of described each stake (3) internal stresses release hole (2) accounts for 2% ~ 3% of corresponding stake (3) area.
6. be according to claim 5ly applicable to inclination solid rock location drilled pile construction method, it is characterized in that: the stress relief hole (2) in described stake (3) is by five-point type quincuncial arrangement.
7. be according to claim 5ly applicable to inclination solid rock location drilled pile construction method, it is characterized in that: the stress relief hole (2) in described stake (3) is arranged around the center of circle annular array of stake (3).
8. be according to claim 5ly applicable to inclination solid rock location drilled pile construction method, it is characterized in that: the stress relief hole (2) in described stake (3) is arranged by box formation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510248001.2A CN104878762A (en) | 2015-05-15 | 2015-05-15 | Bored pile construction method suitable for tilt hard rock section |
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| CN201510248001.2A CN104878762A (en) | 2015-05-15 | 2015-05-15 | Bored pile construction method suitable for tilt hard rock section |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106759282A (en) * | 2016-12-30 | 2017-05-31 | 安徽省建筑科学研究设计院 | A kind of mechanical hole building method of super-large diameter hard rock bored concrete pile half |
| CN107503345A (en) * | 2017-09-27 | 2017-12-22 | 中铁二十局集团有限公司 | A kind of deep water foundation pile foundation construction process |
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2015
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Patent Citations (4)
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| JP2003321988A (en) * | 2002-05-02 | 2003-11-14 | Toenec Corp | Excavation method and excavator for shaft by earth auger |
| CN101570971A (en) * | 2009-05-31 | 2009-11-04 | 中国水利水电第四工程局有限公司 | Rock mass pile foundation pore-forming preboring construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759282A (en) * | 2016-12-30 | 2017-05-31 | 安徽省建筑科学研究设计院 | A kind of mechanical hole building method of super-large diameter hard rock bored concrete pile half |
| CN106759282B (en) * | 2016-12-30 | 2018-03-20 | 安徽省建筑科学研究设计院 | A kind of mechanical hole building method of super-large diameter hard rock bored concrete pile half |
| CN107503345A (en) * | 2017-09-27 | 2017-12-22 | 中铁二十局集团有限公司 | A kind of deep water foundation pile foundation construction process |
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Application publication date: 20150902 |
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