CN104695426A - Gas lift method based secondary hole cleaning construction process for overlength pile foundations - Google Patents
Gas lift method based secondary hole cleaning construction process for overlength pile foundations Download PDFInfo
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- CN104695426A CN104695426A CN201510140935.4A CN201510140935A CN104695426A CN 104695426 A CN104695426 A CN 104695426A CN 201510140935 A CN201510140935 A CN 201510140935A CN 104695426 A CN104695426 A CN 104695426A
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Abstract
The invention discloses a gas lift method based secondary hole cleaning construction process for overlength pile foundations. The gas lift method based secondary hole cleaning construction process includes: (1), measuring hole depth and hole bottom mud specific gravity, and mounting a guide pipe; (2), arranging a segmental galvanized air pipe in the guide pipe; (3), connecting the guide pipe with a guide pipe connector portion of a gas lift cap, connecting an air pipe connector portion of the gas lift cap with an air compressor through a high-pressure air pipe, connecting a bent pipe of the gas lift cap with a mud outlet pipe, and completing connection of a mud supplement pipe in a hole; (4), turning on an airflow control switch of the air pipe connector portion after mud supplement, starting the air compressor to inject high-pressure gas into the guide pipe, and continuously supplementing a proper proportion of mud into the hole synchronously; (5), according to the measured hole depth and sediment thickness, lifting the gas lift cap by lifting equipment to probe downwardly again, cleaning sediments at the bottom of the hole layer by layer, and stopping hole cleaning until the hole depth, the sediment thickness and mud indexes meet standard requirements. By the gas lift method based secondary hole cleaning construction process, hole cleaning time is shortened greatly, construction efficiency is improved remarkably, and hole cleaning quality is high.
Description
Technical field
The present invention relates to pile foundation construction field, particularly relate to a kind of overlength pile foundation gas lift method secondary pile hole cleaning construction technology.
Background technology
In recent years, overlength, the application of large diameter pile foundation in highrise building, large bridges day by day increase.But conventional clear hole Slagoff method, as slurry processes or inverse circulation pump suction method etc. are changed in direct circulation, is applied to this type of pile foundation engineering, is always difficult to receive desirable effect.Quality of mud fluid is usually improved or after increasing equipment investment all measures taking in scene, secondary pile hole cleaning also time have repeatedly; The secondary pile hole cleaning time is often veryer long, and the pile foundation quality risk such as hole, shrinkage cavity that collapses doubles at any time; High concentration slurry in turn increases the hidden danger of quality of pile body slag inclusion or broken pile.So how shortening the clear hole time, improve the work efficiency of secondary pile hole cleaning, is a technical barrier of such pile foundation of puzzlement always.Therefore, need badly and provide a kind of novel overlength pile foundation secondary pile hole cleaning construction technology to solve the problems referred to above.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of overlength pile foundation gas lift method secondary pile hole cleaning construction technology, can greatly shorten the clear hole time, significantly improve construction efficiency.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: provide a kind of overlength pile foundation gas lift method secondary pile hole cleaning construction technology, comprise the following steps:
(1) need the hole depth of secondary pile hole cleaning with the measurement of lining rope method, mud balance bottom measured hole, carries out the installation of conduit, again measures hole depth, and calculate sediment thickness and sediment speed simultaneously;
(2) zinc-plated airduct is put into conduit by conduit upper port, insert the lifting hole(eyelet) on zinc-plated airduct top with cross-arm reinforcing bar and carry on a shoulder pole at conduit oral area, carry out the installation of the zinc-plated airduct of next sections, the zinc-plated airduct iron wire of every adjacent segment is buckled the reinforcement connection holes be each passed through between upper-lower segment and is reinforced, and the zinc-plated airduct of last sections is connected with the duct collar bottom on the gaslift cap of conduit upper port;
(3) be connected with the catheter interface portion of gaslift cap by conduit, the duct collar top of gaslift cap is connected with air compressor by high-pressure air hose, and the bend pipe of gaslift cap is connected with outlet pipe, and completes the connection of mending slurry pipe in hole;
(4) slurry is mended in advance, open the gas flow optimized switch on duct collar top again, open in air compressor conductive pipe and inject gases at high pressure, and synchronous continuing in hole supplements the mud meeting secondary pile hole cleaning index request, in gaslift process, suitably throw conduit up and down according to slurry-outlet quantity and air compressor gauge pressure values;
(5) hole depth recorded according to the last time and sediment thickness, to be played gaslift cap, again test, successively sediment at the bottom of cleaning hole by crane gear, until record hole depth, sediment thickness and mud index all meet code requirement, namely terminate hole clearly.
In a preferred embodiment of the present invention, the conduit mouth of pipe is positioned at the top of the inner hole deposition top of the slag, judges that the conduit mouth of pipe is in the relative position in sediment face according to sediment thickness and sediment speed, is beneficial to the amplitude that control conduit when secondary pile hole cleaning, is put forward or transferred first time.Preferably, conduit nose end is apart from distance controlling 30 ~ 50cm more than sediment face in sediment face.
In a preferred embodiment of the present invention, judge the degree of depth of zinc-plated airduct test according to sediment thickness and sediment speed; Or estimate the degree of depth of zinc-plated airduct test according to air compressor gauge pressure values and mud balance, preferably, the zinc-plated airduct test degree of depth is 0.3 ~ 0.4 times of hole depth.
In a preferred embodiment of the present invention, the specified meter pressure of air compressor is not less than 1.2Mpa, and the startup meter pressure of secondary pile hole cleaning is not less than 0.4Mpa, and normal worksheet pressure is between 0.6Mpa ~ 0.8Mpa.
In a preferred embodiment of the present invention, zinc-plated airduct end arranges a gas slurry blender, namely opening 4 ~ 5 rows within the scope of one meter, zinc-plated airduct end, often to arrange 8 ~ 10 diameters be the pore of 10mm, be used for strengthening gas slurry mixed effect with this.
In a preferred embodiment of the present invention, in the process of clear hole, head height must be not less than 2m in retaining hole, prevent segregation, prevent the hole that collapses.
In a preferred embodiment of the present invention, when terminating clear hole, first closed gas flow gauge tap stops mending slurry again, in case head reduction causes the hole that collapses in hole.
The invention has the beneficial effects as follows: the present invention is under suitable air pressure and gaslift severity control, can greatly shorten the clear hole time, significantly improve construction efficiency, greatly reduce and cause because of timeliness retardation the quality risks such as hole shrinkage cavity that collapse, clear boring ratio is comparatively thorough, is conducive to ensureing pile foundation quality; And not high to the quality requirement of mud, speed of slagging tap is fast, and production efficiency is high, greatly reduces clear hole measure cost, reduces environment pollution, saves construction cost.
Accompanying drawing explanation
Fig. 1 is the process chart of overlength pile foundation gas lift method secondary pile hole cleaning construction technology of the present invention;
Fig. 2 is the connection diagram between described zinc-plated airduct tube coupling;
Fig. 3 is the structural representation of described gaslift cap;
Fig. 4 is the general principle figure of overlength pile foundation gas lift method secondary pile hole cleaning construction technology of the present invention;
In accompanying drawing, the mark of each parts is as follows: 1, zinc-plated airduct, and 11, strengthen interface, 12, lifting hole(eyelet), 13, screw thread, 14 iron wires are buckled, 2, gaslift cap, 21, bend pipe, 22, Heave Here, 3, conduit, 4, outlet pipe, 5, mend slurry pipe, 6, high-pressure air hose, 7, air compressor.
Detailed description of the invention
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Refer to Fig. 1, the embodiment of the present invention comprises:
A kind of overlength pile foundation gas lift method secondary pile hole cleaning construction technology, comprises the following steps:
(1) hole depth of secondary pile hole cleaning is needed with the measurement of lining rope method, mud balance bottom measured hole simultaneously, carry out the installation of conduit 3, the physical length that conduit 3 is installed is not less than the hole depth recorded, again measure hole depth and calculate sediment thickness and sediment speed, wherein, sediment thickness i.e. front and back record the difference of hole depth for twice, sediment speed and the sediment thickness in the unit interval;
Before conduit 3 is installed, reply conduit 3 does comprehensive inspection, does packer permeability test, prevents conduit 3 from leaking.Conduit 3 must have enough rigidity, inner wall smooth.Conduit 3 mouth of pipe is positioned at the top of the inner hole deposition top of the slag, judges that conduit 3 mouth of pipe is in the relative position in sediment face according to sediment thickness and sediment speed, is beneficial to the amplitude that control conduit 3 when secondary pile hole cleaning, is put forward or transferred first time.Preferably, conduit 3 nose end is apart from distance controlling 30 ~ 50cm more than sediment face in sediment face;
(2) according to sediment thickness and sediment speed thereof, just sentence the degree of depth of the suitable test of zinc-plated airduct 1, then carry out the installation of zinc-plated airduct 1.Zinc-plated airduct 1 is put into conduit by conduit 3 upper port, insert the lifting hole(eyelet) 12 on zinc-plated airduct 1 top with cross-arm reinforcing bar and carry on a shoulder pole at conduit 3 oral area, carry out the installation of the zinc-plated airduct 1 of next sections, refer to Fig. 2, at every root zinc-plated airduct 1 two ends far from 10 ~ 15cm place, end, weld a nut respectively as reinforcement connection holes 11, by screw thread 13 end relative position weldering one slightly big nut as lifting hole(eyelet) 12, the zinc-plated airduct 1 of adjacent two segment is connected by screw thread 13, the zinc-plated airduct 1 of every adjacent segment is buckled the 14 reinforcement connection holes 11 be each passed through between upper-lower segment with iron wire and is reinforced, in case zinc-plated airduct 1 is threaded off at screw thread 14 place or ruptures and fall pipe in gaslift process.The zinc-plated airduct 1 of last sections is connected with the duct collar bottom on the gaslift cap 2 of conduit 3 upper port, crane gear is now needed to sling gaslift cap 2, and near 3 mouthfuls, conduit, then connecting of zinc-plated airduct 1 between last sections with gaslift cap 2 is carried out, to be coupled and after having reinforced, extract the cross-arm reinforcing bar of last sections out, whereabouts gaslift cap 2, and it is connected by screw thread is firm with conduit 3;
Refer to Fig. 3, described gaslift cap 2 is the important device in this construction technology, it comprises catheter interface portion, bend pipe 21, duct collar portion, Heave Here 22, the interface specification of gaslift cap 2 should with the match specifications of conduit 3, zinc-plated airduct 1, bend pipe 21 should match with the caliber of on-the-spot slurrying system, the caliber of bend pipe 21 should between 30% ~ 50% of conduit 3 caliber, its length is advisable with 50cm, Heave Here 22 should be accomplished solid and reliable when welding processing, carry out magnetic crack detection if desired, it should be able to bear the weight of conduit 3 and zinc-plated airduct 1.
For strengthening gas slurry mixed effect, zinc-plated airduct 1 end arranges a gas slurry blender, namely opening 4 ~ 5 rows within the scope of zinc-plated one meter, airduct 1 end, often to arrange 8 ~ 10 diameters be the pore of 10mm.
(3) conduit 3 is connected by screw thread with the catheter interface portion of gaslift cap 2, the duct collar portion of gaslift cap 2 is connected with air compressor 7 by high-pressure air hose 6, the bend pipe 21 of gaslift cap 2 is connected with outlet pipe 4, guarantee that each several part connects firm, and complete the connection of mending slurry pipe 5 in hole, guarantee that passage is smooth and easy;
(4) slurry is mended in advance, open the gas flow optimized switch in duct collar portion again, open in air compressor 7 conductive pipe 3 and inject gases at high pressure, and synchronous continuing in hole supplements the mud meeting secondary pile hole cleaning index request, head difference inside and outside retaining hole, the displacement of mud should be undertaken by the standard of secondary pile hole cleaning, and the relative density 1.03 ~ 1.10 of mud is maximum no more than 1.15; Viscosity 17 ~ 20Pa.s; Sand factor < 2%; Colloidity > 98%.In gaslift process, suitably conduit 3 is thrown up and down according to slurry-outlet quantity and air compressor 7 gauge pressure values, be beneficial to slag tap and the amplitude of expansion kettle at the bottom of reduction holes, 3 mouthfuls, conduit is advisable to press close to sediment face, pick up height is no more than sediment face more than 1m, in case cause reaming or the hole that collapses, the test degree of depth is also unsuitable excessive, in case the mouth of pipe penetrates in the beds of precipitation excessively dark, resulting in blockage cannot deslagging phenomenon;
Before opening gas flow optimized switch, the tightness that outlet pipe 4 is connected with the bend pipe 21 of gaslift cap 2 should be checked, avoid de-pipe; The slurry output end of outlet pipe 4 should be fixed with timber etc. in mud pit, in case it acutely swings and mud flashes.
The specified meter pressure of air compressor 7 is not less than 1.2Mpa, and the startup meter pressure of secondary pile hole cleaning is not less than 0.4Mpa, and normal worksheet pressure is between 0.6Mpa ~ 0.8Mpa.In fact, according to air compressor 7 gauge pressure values, and mud balance, under also can estimating certain blast zinc-plated airduct 1 bottom can the most deep location of test, as: it is 0.4MPa that air compressor 7 exports gauge pressure, mud balance 1.2KN/m
3, then zinc-plated airduct 1 can transmit the greatest limit degree of depth of air compressor 7 meter pressure is h=0.4*10
6/ (1.2*10
3* 9.8)=34m; If it is 0.8MPa, then h=68m that air compressor 7 exports meter pressure.In actual job, in order to save the activity duration, and consider gaslift effect, based on experience value, the zinc-plated airduct 1 test degree of depth is generally 0.3 ~ 0.4 times of hole depth, and air compressor 7 gauge pressure values under normal work is generally 1.5 ~ 2 times of the corresponding atmospheric pressure value in corresponding zinc-plated airduct 1 bottom nozzle place.
When air compressor 7 worksheet pressure is lower than 0.4MPa, should stop again mending slurry by first closed gas flow gauge tap.This appropriate to the occasion timely measurement hole depth, guarantees absolute altitude at the bottom of hole, unsuitable ultra-deep.In the process of clear hole, head height must be not less than 2m in retaining hole, prevent segregation, prevent the hole that collapses.
(5) hole depth recorded according to the last time and sediment thickness, to be played gaslift cap 2 by crane gear, test again, successively sediment at the bottom of cleaning hole, needs to increase conduit 3 tube coupling length, in the process of clear hole if desired, along with the ftercompction of air compressor 7, related data should be measured in time, until record hole depth, sediment thickness and mud index all meet code requirement, namely terminate hole clearly.
When terminating clear hole, first closed gas flow gauge tap stops mending slurry again, in case head reduction causes the hole that collapses in hole.And in time remove zinc-plated airduct 1 in gaslift cap 2 and conduit 3, when adjusting filling concrete, conduit 3 Len req, carries out the underwater gliders operation of pile foundation in time.
Specifically describe the general principle of gas lift method secondary pile hole cleaning construction technology of the present invention below, composition graphs 4: during secondary pile hole cleaning, in pipe, gases at high pressure are injected by the zinc-plated airduct 1 preset in conduit 3, make it at certain depth place and manage interior mud and fully mix, slurry gas mixed liquor density reduces; little proportion mixed liquor floats and makes its underpart produce negative pressure, and the air feed of continuation makes this pressure reduction continue to keep, thus bottom and bottom fluid column in pipe are constantly upwards flowed; Conduit 3 cross section is little many than gross section between pipe outer wall and stake holes, under air pressure interlock effect, the slurries interior flowing of conductive pipe 3 continuously and healthily in hole bottom conduit 3, then in conduit 3, define the reacting cycle that flow velocity is very fast, flow is larger, boring mud larger for proportion at the bottom of hole is carried discharge by the effect wrapped up in of taking of fluid fast, reaches the object in hole clearly.Meanwhile, be liquid level in retaining hole, clear Kong Shixu continues in hole, inject the mud meeting secondary pile hole cleaning index request.
This technique equipment needed thereby structure is simple, and with low cost, maintenance cost is little, and can recycle, and its all kinds of equipment special, as gaslift cap 2, all can utilize on-the-spot material processing and fabricating voluntarily, as long as each component processing is firm, does not almost have maintenance cost in use procedure; Under suitable air pressure and gaslift severity control, this method can significantly improve construction efficiency, greatly reduces and causes because of timeliness retardation the quality risks such as hole shrinkage cavity that collapse, and clear boring ratio is comparatively thorough, is conducive to ensureing pile foundation quality; For general clear hole measure, this method is not high to the quality requirement of mud, do not need during normal operation to prepare high-quality especially again or high concentration slurry can meet the requirement of clear hole, speed of slagging tap is fast, production efficiency is high, thus greatly can reduce clear hole measure cost, reduce environment pollution, save construction cost; In addition, this technique does not almost affect reinforcing cage, sound detecting pipe, is conducive to protecting mud off, more obvious for Extra Large Pile footpath, ultra-deep pile foundation hole cleaning effect.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize manual of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. an overlength pile foundation gas lift method secondary pile hole cleaning construction technology, comprises the following steps:
(1) need the hole depth of secondary pile hole cleaning with the measurement of lining rope method, mud balance bottom measured hole, carries out the installation of conduit, again measures hole depth, and calculate sediment thickness and sediment speed simultaneously;
(2) zinc-plated airduct is put into conduit by conduit upper port, insert the lifting hole(eyelet) on zinc-plated airduct top with cross-arm reinforcing bar and carry on a shoulder pole at conduit oral area, carry out the installation of the zinc-plated airduct of next sections, the zinc-plated airduct iron wire of every adjacent segment is buckled the reinforcement connection holes be each passed through between upper-lower segment and is reinforced, and the zinc-plated airduct of last sections is connected with the duct collar bottom on the gaslift cap of conduit upper port;
(3) be connected with the catheter interface portion of gaslift cap by conduit, the duct collar top of gaslift cap is connected with air compressor by high-pressure air hose, and the bend pipe of gaslift cap is connected with outlet pipe, and completes the connection of mending slurry pipe in hole;
(4) slurry is mended in advance, open the gas flow optimized switch on duct collar top again, open in air compressor conductive pipe and inject gases at high pressure, and synchronous continuing in hole supplements the mud meeting secondary pile hole cleaning index request, in gaslift process, suitably throw conduit up and down according to slurry-outlet quantity and air compressor gauge pressure values;
(5) hole depth recorded according to the last time and sediment thickness, to be played gaslift cap, again test, successively sediment at the bottom of cleaning hole by crane gear, until record hole depth, sediment thickness and mud index all meet code requirement, namely terminate hole clearly.
2. overlength pile foundation gas lift method secondary pile hole cleaning construction technology according to claim 1, it is characterized in that, the conduit mouth of pipe is positioned at the top of the inner hole deposition top of the slag, judges that the conduit mouth of pipe is in the relative position in sediment face according to sediment thickness and sediment speed.
3. overlength pile foundation gas lift method secondary pile hole cleaning construction technology according to claim 2, is characterized in that, conduit nose end is apart from distance controlling 30 ~ 50cm more than sediment face in sediment face.
4. overlength pile foundation gas lift method secondary pile hole cleaning construction technology according to claim 1, is characterized in that, judge the degree of depth of zinc-plated airduct test according to sediment thickness and sediment speed.
5. overlength pile foundation gas lift method secondary pile hole cleaning construction technology according to claim 1, is characterized in that, estimate the degree of depth of zinc-plated airduct test according to air compressor gauge pressure values and mud balance.
6. the overlength pile foundation gas lift method secondary pile hole cleaning construction technology according to claim 4 or 5, is characterized in that, the zinc-plated airduct test degree of depth is 0.3 ~ 0.4 times of hole depth.
7. overlength pile foundation gas lift method secondary pile hole cleaning construction technology according to claim 1, it is characterized in that, the specified meter pressure of air compressor is not less than 1.2Mpa, and the startup meter pressure of secondary pile hole cleaning is not less than 0.4Mpa, and normal worksheet pressure is between 0.6Mpa ~ 0.8Mpa.
8. overlength pile foundation gas lift method secondary pile hole cleaning construction technology according to claim 1, is characterized in that, zinc-plated airduct end arranges a gas slurry blender, namely opening 4 ~ 5 rows within the scope of one meter, zinc-plated airduct end, often to arrange 8 ~ 10 diameters be the pore of 10mm.
9. overlength pile foundation gas lift method secondary pile hole cleaning construction technology according to claim 1, is characterized in that, in the process of clear hole, head height must be not less than 2m in retaining hole.
10. overlength pile foundation gas lift method secondary pile hole cleaning construction technology according to claim 1, is characterized in that, when terminating clear hole, first closed gas flow gauge tap stops mending slurry again.
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| CN201510140935.4A CN104695426A (en) | 2015-03-29 | 2015-03-29 | Gas lift method based secondary hole cleaning construction process for overlength pile foundations |
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|---|---|---|---|
| CN201510140935.4A CN104695426A (en) | 2015-03-29 | 2015-03-29 | Gas lift method based secondary hole cleaning construction process for overlength pile foundations |
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| CN107806098A (en) * | 2017-10-20 | 2018-03-16 | 中国二十冶集团有限公司 | Sediment cleaning plant and with enlarged footing priming concrete pile hole in sediment method for cleaning |
| CN107956422A (en) * | 2017-11-15 | 2018-04-24 | 亨通华西海洋工程有限公司 | A kind of sea bore process |
| CN111706276A (en) * | 2020-06-24 | 2020-09-25 | 中建四局土木工程有限公司 | Gas lift slag-returning pore-forming construction method |
| CN112030972A (en) * | 2020-07-30 | 2020-12-04 | 中国二十冶集团有限公司 | Secondary hole cleaning device and method for cast-in-place pile |
| CN114705834A (en) * | 2022-03-31 | 2022-07-05 | 安徽理工大学 | Indoor test system for simulating gas lift reverse circulation slurry suspension slag discharge and test method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114705834A (en) * | 2022-03-31 | 2022-07-05 | 安徽理工大学 | Indoor test system for simulating gas lift reverse circulation slurry suspension slag discharge and test method thereof |
| CN114705834B (en) * | 2022-03-31 | 2023-08-18 | 安徽理工大学 | Simulated gas lift reverse circulation slurry suspension deslagging indoor test system and test method thereof |
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