CN103277037B - Pipe pile leading-hole construction method under boulder cluster geological condition - Google Patents
Pipe pile leading-hole construction method under boulder cluster geological condition Download PDFInfo
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Abstract
The present invention relates to pipe pile construction method, specifically a kind of pipe pile leading-hole construction method under boulder cluster geological condition.It adopts DTH drilling technique, and the dregs got out is forced to discharge by auger stem revolution mode, and coordinates high wind all to be removed by dregs; Promoted eliminating sediment by the clear hole 2-3 of air pressure minute with screw rod at the bottom of down-hole hammer hole after boring reaches design hole depth, hole depth and sediment thickness≤50mm stop after meeting design requirement after testing; As detection sediment thickness & gt; During 50mm, down-hole hammer should be descended again in hand-hole to carry out second time to ask hole, until meet actual requirement.Short construction period of the present invention, can save construction cost more than 10% under patent identical operation condition, stratum is applied widely, is particularly suitable for the construction of the bad ground such as landslide, instability; Machine-tool is by force selective, low to site requirements, is particularly suitable for the medium narrow and small place of massif.
Description
Technical field
The present invention relates to pipe pile construction method, specifically a kind of pipe pile leading-hole construction method under boulder cluster geological condition.
Background technology
At present, pile tube draws hole construction conventional rotary drilling rig, jump bit, clean-out machine, full-sleeve full-rotation drill, these equipment exist that work efficiency is low all to some extent, drill tool wear is fast, drilling rod easy fracture, mud contamination are serious, construction quality without ensureing, the shortcoming of construction system complexity, especially the casting ability of conventional drilling machine relies on the throughput of air compressor machine completely, strengthen casting ability, just must configure larger air compressor machine, cause construction cost to increase.Cannot rock be penetrated for boulder group geological conditions traditional construction Static Pressure Prefabricated Pipe Pile, traditional blasting method cannot be adopted, also cannot adopt manually digging hole mode.
Summary of the invention
The present invention is intended to solve pile tube under boulder group geological conditions and draws the problems referred to above that hole exists, and provides the pipe pile leading-hole construction method under boulder cluster geological condition that a kind of speed of fulfiling hole is fast, reliable construction quality, environment protecting are good.
The technical scheme that the present invention solves the employing of described problem is:
A kind of pipe pile leading-hole construction method under boulder cluster geological condition, is characterized in that, it adopts DTH drilling technique, after down-hole hammer driller insertion, adjusts pile frame verticality, makes drilling tool, unit head and position, hole sight alignment, guarantee that perforate verticality is accurate; In DTH drilling process, drill bit is carried out impact chisel to hole bed rock stone continuously and is entered, rock forms volumetric fracture under the effect of drill bit impact merit, fragmented rock powder agglomates to be blown off at the bottom of hole by the air with certain pressure and speed and is rotated and delivery port by helical blade on down-hole hammer, reaches into rock function; Promoted eliminating sediment by the clear hole 2-3 of air pressure minute with screw rod at the bottom of down-hole hammer hole after boring reaches design hole depth, hole depth and sediment thickness≤50mm stop after meeting design requirement after testing; When detecting sediment thickness >50mm, down-hole hammer is descended again in hand-hole to carry out second time to ask hole, until meet actual requirement.
Adopt the present invention of technique scheme, there is following advantage and good effect compared with conventional method:
Short construction period, under identical operating condition, can save construction cost more than 10%; Stratum is applied widely, can provide powerful and that tool is flexible boring capacity; Effectively can prevent the bury drills phenomenon occurred when ovum (broken) rock layers is constructed; Be particularly suitable for the construction of the bad ground such as landslide, instability; Machine-tool by force selective, low to the requirement in place, be particularly suitable for the medium narrow and small place of massif.
Accompanying drawing explanation
Fig. 1 is present invention process flow chart.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described, and object is only to understand content of the present invention better.Therefore, the cited case does not limit the scope of the invention.
See Fig. 1, the pipe pile leading-hole construction method under boulder cluster geological condition described in the present embodiment, carry out in the steps below:
(1) measurement and positioning:
The measurement of coordinates control point arranged in place according to owner is benchmark, utilize rangefinder, pass through coordinate transformation, corner, range finding, fixed point, release the Center stake of often organizing stake and the stake position of arbitrary with Center stake coaxial line one by one, often organizes other positions of stake then according to working drawing, the Center stake that utilization has been released and the reference stake with Center stake coaxial line, release one by one with invar tape, often organize stake position timber and hammer in soil layer, and to cross mark with red and blue pencil.
(2) down-hole hammer is in place:
Down-hole hammer rig, before displacement, must check preparation construction area place in advance, watch the degree of compaction in place, planeness.Down-the-hole pile machine equipment assembly, accessory weight is large, body is long, needs an excavator coordinative construction during assembling.Rig, in shifting process, must have special messenger to command; The good steel plate of place mat; Rig answers " determine people and determine machine ".Down-hole hammer driller insertion, adjusts pile frame verticality, and the necessary sight alignment in drilling tool, unit head and position, hole, guarantees that perforate verticality is accurate.Rig is being executed in drill-through journey, and the verticality of special messenger to rig must be sent to observe, and when there are abnormal conditions, must stop construction immediately.
(3) DTH drilling:
In DTH drilling process, the piston in the high pressure air drives down-hole hammer cylinder body provided by air compressor machine does high-frequency reciprocating motion.And the kinetic energy this motion produced is delivered on drill bit continuously, makes drill bit obtain certain ballistic work.Drill bit, under the effect of ballistic work, is carried out impact chisel to hole bed rock stone continuously and is entered.Rock, under the effect of this drill bit impact merit, forms volumetric fracture.Fragmented rock powder agglomates to be blown off at the bottom of hole by the air with certain pressure and speed and is rotated and delivery port by helical blade on down-hole hammer, reaches into rock function.Cut a hole into process in, down-hole hammer equipment carries and controls verticality function, can ensure the verticality of pore-forming.
In order to prevent hole deviation, if when finding in percussion drilling that the anti-quantity of slag is few or percussion drilling efficiency is low or hole wall is unstable, repeatedly short distance should carry drilling tool, in case collapsing and breaking is so that bury drills stick of tool accident occurs.Namely percussion drilling punches rock stratum of rockfilling to design hole depth, and drilling tool vertical down speed may change quickening suddenly, now should consider to stop percussion drilling, and drilling tool is back and forth carried up and down drilling tool to drilling tool can smooth and easy time aperture is proposed.For preventing intaking in down-hole hammer, when carrying drilling tool up and down, air feed don't be stopped.When running into boulder and cobble, erratic boulder in percussion drilling, during backfill stone stratum not of uniform size, boulder and cobble or backfill stone are by after impact drilling tool extruding, probably to roll displacement, even extruding, steering drilling tool drill bit, as easy as rolling off a logly cause boring off normal, thus cause pile pipe to be difficult to squeeze into or run-off the straight even broken pile.In this section stratum in percussive drilling construction, the conservative practice of " slow two low three gently presses " during perforate, to be taked.Keeping indirectly carrying drilling tool up and down, its objective is as preventing collapsing and breaking by drilling rod locking, is on the other hand to remove in hole wall unstable " probe stone " in case stick of tool.Pore-forming points for attention: meet boulder, stop boring (maintenance air feed), and short distance gently press hang up and beat, original position back and forth carries drilling tool up and down; This process is no less than three times.
(4) clear hole:
Promoted eliminating sediment by the clear hole 2-3 of air pressure minute with screw rod at the bottom of down-hole hammer hole after boring reaches design hole depth, hole depth and sediment thickness≤50mm stop after meeting design requirement after testing.Slagging channel is provided with at rig down-hole hammer cephalic par, the slag cut can utilize pressure wind to be discharged on long screw drill rod by slagging channel for medium, long screw drill rod is promoted, the slag got out just can directly drain into outside hole, complete the clear hole of boring, after cleaning by high-voltage high-speed pressure wind, be cleaned at the bottom of hole, there is not sediment.When detecting sediment thickness >50mm, down-hole hammer should be descended again in hand-hole to carry out second time to ask hole, until meet actual requirement.
Pore-forming, verify:
According to the form below requires to verify, and hole depth is whole hole after inspection meets the requirements.
Claims (1)
1. a pipe pile leading-hole construction method under boulder cluster geological condition, is characterized in that,
(1) measurement and positioning:
The measurement of coordinates control point arranged in place according to owner is benchmark, utilize rangefinder, by coordinate transformation, corner, range finding, fixed point, release the Center stake of often organizing stake and the stake position with reference to stake with Center stake coaxial line one by one, often organize other positions of stake then according to working drawing, the Center stake that utilization has been released and the reference stake with Center stake coaxial line, release one by one with invar tape, often organize stake position timber to hammer in soil layer, and to cross mark with red and blue pencil;
(2) down-hole hammer driller insertion:
Down-hole hammer rig, before displacement, must check preparation construction area place in advance, watch the degree of compaction in place, planeness; Down-the-hole hammer drill machine equipment assembly, accessory weight is large, body is long, needs an excavator coordinative construction during assembling;
Rig, in shifting process, must have special messenger to command; The good steel plate of place mat; Rig answers " determine people and determine machine "; Down-hole hammer driller insertion, adjusts pile frame verticality, and the necessary sight alignment in drilling tool, unit head and position, hole, guarantees that perforate verticality is accurate;
(3) down-the-hole hammer drill machine drill enters:
In down-hole hammer borer drilling procedure, the piston in the high pressure air drives down-hole hammer cylinder body provided by air compressor machine does high-frequency reciprocating motion;
And the kinetic energy this motion produced is delivered on drill bit continuously, makes drill bit obtain certain ballistic work; Drill bit, under the effect of ballistic work, is carried out impact chisel to hole bed rock stone continuously and is entered; Rock under the effect of this drill bit impact merit, volumetric fracture; Fragmented rock powder agglomates to be blown off at the bottom of hole by the air with certain pressure and speed and is rotated and delivery port by helical blade on long screw drill rod, reaches into rock function; Cut a hole into process in, down-hole hammer rig carries and controls verticality function, can ensure the verticality of perforate;
In order to prevent hole deviation, if when finding in percussion drilling that the anti-quantity of slag is few or percussion drilling efficiency is low or hole wall is unstable, repeatedly short distance should carry drilling tool, in case collapsing and breaking is so that bury drills stick of tool accident occurs; Percussion drilling to design hole depth after namely punch rock stratum of rockfilling, drilling tool vertically down speed change quickening suddenly, now should consider stop percussion drilling, and drilling tool is back and forth carried up and down to drilling tool can smooth and easy time propose aperture; For preventing intaking in down-hole hammer, when carrying drilling tool up and down, air feed don't be stopped;
When run in percussion drilling boulder and cobble, erratic boulder or backfill stone stratum not of uniform size time, boulder and cobble, erratic boulder or backfill stone are by after impact drilling tool extruding, roll and conjugate, even extruding, steering drilling tool drill bit, as easy as rolling off a logly cause boring off normal, thus cause pile tube to be difficult to squeeze into or run-off the straight even broken pile; In this section stratum in percussive drilling construction, the conservative practice of " slow two low three gently presses " during perforate, to be taked; Keep indirectly carrying drilling tool up and down, its object is for preventing collapsing and breaking by long screw drill rod locking on the one hand, is on the other hand to remove in hole wall unstable " probe stone " in case stick of tool; Perforate points for attention: meet boulder, stop boring, keeping air feed, and short distance gently press hang up and beat, original position back and forth carries drilling tool up and down, this process is no less than three times;
(4) clear hole:
After boring reaches design hole depth, by the clear hole 2-3 minute of air pressure at the bottom of hole, down-hole hammer promotes with long screw drill rod gets rid of sediment, and hole depth and sediment thickness≤50mm stop after meeting design requirement after testing;
Slagging channel is provided with in drill bit of drilling machine end, the sediment cut utilizes pressure air to be discharged on long screw drill rod by slagging channel for medium, long screw drill rod is promoted, the sediment got out just directly drains into outside hole, complete the clear hole of boring, after cleaning by high-voltage high-speed pressure air, be cleaned at the bottom of hole, there is not sediment; When detecting sediment thickness >50mm, drilling tool should be descended again in hand-hole to carry out the clear hole of second time, until meet actual requirement;
(5) pore-forming, verify.
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| CN105275381B (en) * | 2014-05-28 | 2018-05-04 | 宏润建设集团股份有限公司 | Impact drill drilling construction method in rich water pebble layer |
| CN105862708A (en) * | 2016-04-26 | 2016-08-17 | 北京振冲工程机械有限公司 | Down-the-hole hammer and guide hole matched construction method for vibro-replacement stone column composite foundation |
| CN106759267B (en) * | 2017-01-22 | 2019-01-22 | 广州市市政集团有限公司 | A kind of auxiliary pilot hole method squeezed into convenient for hard formation steel sheet pile |
| CN110273417B (en) * | 2019-07-07 | 2021-12-28 | 广州粤嘉工程技术有限公司 | Construction method of cast-in-place pile for constructional engineering |
| CN110952916A (en) * | 2019-11-28 | 2020-04-03 | 武汉金瑞威基础工程有限公司 | Construction method for crushing and dismantling deep part of old building pile foundation |
| CN114352198B (en) * | 2022-02-08 | 2023-08-08 | 江西理工大学 | Matching type drill rod positioning auxiliary device for blasting and drilling |
| CN114704202A (en) * | 2022-03-23 | 2022-07-05 | 保利长大工程有限公司 | Construction method of bare rock geological pile foundation |
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| CN1121131A (en) * | 1994-10-20 | 1996-04-24 | 宋丁晚 | Inverse construction process for precisely erecting underground reinforced concrete column and equipment thereof |
| CN101148876A (en) * | 2007-11-05 | 2008-03-26 | 山东省机械施工有限公司 | Large load composite pile and construction method thereof |
| CN103132908A (en) * | 2013-02-07 | 2013-06-05 | 宁波市中乾建筑工程有限公司 | Device for drilling rock and embedding rock-socketed prestressed pipe pile by down-hole hammer and construction method of device |
| CN103161164A (en) * | 2013-03-27 | 2013-06-19 | 孔超 | Rock-socketed pre-stressed pipe pile for slip casting after spinning drilling rock is planted in pile bottom |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1121131A (en) * | 1994-10-20 | 1996-04-24 | 宋丁晚 | Inverse construction process for precisely erecting underground reinforced concrete column and equipment thereof |
| CN101148876A (en) * | 2007-11-05 | 2008-03-26 | 山东省机械施工有限公司 | Large load composite pile and construction method thereof |
| CN103132908A (en) * | 2013-02-07 | 2013-06-05 | 宁波市中乾建筑工程有限公司 | Device for drilling rock and embedding rock-socketed prestressed pipe pile by down-hole hammer and construction method of device |
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