CN107313438A - The dewatering well in complex geological condition area is into well construction method - Google Patents
The dewatering well in complex geological condition area is into well construction method Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
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- E02D19/10—Restraining of underground water by lowering level of ground water
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Abstract
The present invention provides a kind of dewatering well in complex geological condition area into well construction method, and its step draws hole step, embedded steel floral tube step, drill pore formation step and borehole cleaning step including carrying out preparation of construction step, reacting cycle using devices such as air down-hole hammer, screw air compressor, water pump, long screw drill rod and steel floral tubes.Whereby, draw hole, embedding steel floral tube by using reacting cycle, and the gap of steel floral tube and hole wall is backfilled with drainage aggregate, pore-forming is continued using down-hole hammer after construction to bottom Cretaceous System mud stone, until reaching the dewatering well bottom absolute altitude of design requirement.Whereby, by the way that reacting cycle is constructed, down-hole hammer construction technology connected applications, while the technique connected using improved steel floral tube as technology, to improve into well construction efficiency and into well success rate.
Description
Technical field
The present invention relates to dewatering well into well technical field, relate in particular to carry out precipitation in the area of complex geologic conditions
Construction method of the well into well.
Background technology
The Yi Tonghe of China Changchun has found that the geology in her logical river is main by three sets of stratum groups during dredging waterway
Into top is artificial earth fill, and middle part is cohesive soil and layer of sand for the 4th, and bottom is Cretaceous System mud stone, and rock and soil properties change is little.
6 main stor(e)ies, 5 subgrades are divided into altogether by its Formed age, genetic type and engineering properties, wherein, the 1st layer of powder of the 2. main stor(e)y
Matter clay and the 2nd layer of Organic Silty Clay have been lacked, other stratum Geotechnical properties and basic law of distribution, as shown in figure 1, existing
The sequencing disclosed by probing is described below：
The 1. main stor(e)y be artificial earth fill and surface water, it can be divided into following several layers of：
1st layer：Water, is distributed in pond, 1.70~4.00m of thickness, layer bottom 189.03~191.33m of absolute altitude.
2nd layer：Miscellaneous fill, modern times artificial landfill, variegated~grey black, based on cohesive soil, containing finger stone, brickbat
Deng.Loosely, slightly wet, soil property is uneven.1.70~2.80m of thickness, layer bottom 192.02~193.54m of absolute altitude.
3rd layer：Plain fill, modern times natural packing, black, based on cohesive soil, containing root system of plant.Loosely, it is slightly wet, soil
Matter is uneven.1.90~2.70m of thickness, layer bottom 191.86~192.79m of absolute altitude.
4th layer：Miscellaneous fill, modern times artificial landfill, ash~grey black based on mud, containing organic matter, presss from both sides a large amount of stones
Block, brickbat etc..Loosely, saturation, soil property is uneven.It is distributed in fish pond, 0.50~3.30m of thickness, layer bottom absolute altitude 188.03~
192.25m。
The 3. main stor(e)y be coarse sand, the 4th is alluvial deposits, grey, slightly close~in it is close, based on slightly close, saturation, composition is with stone
Based on English, feldspar, particle diameter based on coarse sand, bottom be gravelly sand and dust, from top to bottom particle become larger, psephicity is poor,
Disproportionately graded.Skewness, 1.10~4.10m of thickness, layer bottom 188.33~191.15m of absolute altitude.
The 4. main stor(e)y be argillaceous siltstoue, Cretaceous System sedimentary rock, completely decomposed, based on celadon argillaceous siltstoue, folder is purple
Red silty, irregularities, mutual bedded structure, shale~arenaceous texture.Wherein sandstone is local based on quartzy feldspar
Detrital grain is larger, and structure is destroyed substantially, is largely weathered into sand shape, bulk.Mud stone main component is clay mineral, structure base
This destruction, is largely weathered into hard plastic clay shape；This layer of cementing properties difference, hand can be crumbed, and soak and be easily disintegrated after air-drying, had soft
The property changed.Rock-mass quality basic grade is V grades.The whole audience is distributed, 2.10~3.70m of thickness, and layer bottom absolute altitude 185.63~
188.65m。
The 5. main stor(e)y be silty, Cretaceous System sedimentary rock is severely-weathered, based on aubergine mudstone, presss from both sides greyish white smalt
Rock, irregularities, mutual bedded structure, shale~arenaceous texture.Wherein mud stone main component is clay mineral, and structure is largely broken
Bad, weathering fissures development, core is in short cylinder；Siltstone is based on quartzy feldspar, and localized debris particle is larger, and structure is most of
Destruction.This layer of cementing properties difference, auger can be crept into, and soaked and be easily disintegrated after air-drying, and have the property of softening, and local folder calcite cementation is hard
Matter sandstone, it is fine and close harder.Rock-mass quality basic grade is V grades.The whole audience is distributed, and discloses 4.90~6.60m of thickness, layer bottom
179.03~182.65m of absolute altitude.
The 6. main stor(e)y be argillaceous siltstoue, Cretaceous System sedimentary rock, middle weathering, based on celadon argillaceous siltstoue, folder is purple
Red silty, irregularities, mutual bedded structure, chiltern~argillaceous texture.Wherein sandstone is local based on quartzy feldspar
Detrital grain is larger, weathering fissures agensis；Mud stone main component is clay mineral, is in the form of a column；Argillaceous agglutination, cementing properties compared with
Difference, soaking and air-drying easily is disintegrated, and has the property of softening, and local folder calcite cementation hard sandstone, densification is harder.Rock mass basic quality
Grade is V grade.Do not expose, disclose maximum thickness 13.00m.According to surveys, ambient water is main along construction project to be built place
For surface water and underground water, surface water is pond water, and groundwater type is pore ground water and Cretaceous System Bedrock Crevice Water.
Further, in her logical river geology surface water, pore ground water, Bedrock Crevice Water has following characteristic through prospecting：
(1) surface water：Fed by Atmospheric precipitation and lateral runoff, evaporation and lateral runoff mode are drained.
(2) pore ground water：Preservation in modern times artificial earth fill (highly permeable layer), the 4th be viscous soil horizon (aquiclude) and
In sandy soils (highly permeable layer).
(3) Bedrock Crevice Water：Main preservation is in complete~severely-weathered Cretaceous System mud stone, and water content is hole with the 4th less
Gap diving has hydraulic connection.
It is the wet season during prospecting, underground initial water level is 1.60~2.40m, and absolute altitude is 192.55~192.96；Underground
Water fixed level is 1.50~2.20m, and absolute altitude is 193.03~193.13m, surface water absolute altitude 193.03m.
It is worth noting that, traditional well drilling technology uses the disposable Cheng Jing of clean-out machine substantially, however, in face of such as foregoing
The complex geological condition in her logical river, causes into well degree of difficulty height, only with single technique Cheng Jing, not only efficiency of construction is low, also
It is attached low into well success rate, so as to need to be proposed a kind of dewatering well suitable for complex geological condition area into well construction method.
The content of the invention
In view of the foregoing, the present invention provides a kind of dewatering well in complex geological condition area into well construction method, passes through
It is the 4th to be the complicated geological of cohesive soil and layer of sand at top artificial earth fill, middle part, hole, the embedding spray of molten steel is drawn using reacting cycle
Pipe, and the gap of steel floral tube and hole wall is backfilled with drainage aggregate, continued into after construction to bottom Cretaceous System mud stone using down-hole hammer
Hole, until reach the dewatering well bottom absolute altitude of design requirement, effectively improves into well construction efficiency and into well success rate.
To achieve the above object, the present invention adopts the technical scheme that the dewatering well for providing a kind of complex geological condition area
Into well construction method, the geological conditions include artificial earth fill formed top, the 4th be cohesive soil and layer of sand formation middle part
And the bottom of Cretaceous System mud stone formation；Wherein, the dewatering well into well construction method the step of include：
Preparation of construction step：After smooth on construction ground, construction control points are confirmed；According to the control point measuring well location
Point, and measured in the location not influenceed by well-digging and permanent control point is set；
Reacting cycle draws hole step：Movement draws hole stake machine arrival and refers to fixed pile centering and adjust long screw drill rod perpendicularity, makes brill
Bar perpendicular alignmnet Zhuan Wei centers；Drilled, when drilling to completion, in the corresponding rig tower in unit head bottom surface stop place
It is in and makees eye-catching mark, is used as the long foundation of Construction control stake；After the completion of the construction of a upper pile, repeat under above step progress
Draw hole in one position；
Steel floral tube buries step：In long screw drill rod boring procedure, down-hole hammer is set to rotate and vibrate with drilling rod, and then
The steel floral tube being placed in advance outside firm air down-hole hammer is driven, before rock stratum is entered, follow-up synchronous with down-hole hammer is kept, will
Steel floral tube is embedded to drawing hole site, and in steel floral tube and draws the space between the hole wall of hole and filled with hydrophobic microlith；
Drill pore formation step：First start the screw air compressor, when air pressure reaches preset pressure, down-hole hammer is with rotation
Vibration, starts rig intrinsic and external motive head and carries out drill；Make the steel floral tube outer with proceeding to closing behind rock stratum with down-hole hammer drilling depth
Unit head, stops with pipe, and internally-powered head drives down-hole hammer to continue drill to enter rock stratum to designing hole depth；
Borehole cleaning step：Drilling reaches after design hole depth that down-hole hammer bottom hole is by air pressure borehole cleaning, to be lifted with long screw drill rod
Exclude sediment；Hole depth meets with sediment thickness≤50mm and stopped after design requirement after testing.
In the inventive method embodiment, in the reacting cycle draws hole step, when drawing hole stake machine to described in, draw hole stake position
A mark post is inserted on pile center's point by design requirement after setting.
In the inventive method embodiment, in the reacting cycle draws hole step, when adjusting the drilling rod perpendicularity, stake is utilized
Front and rear and left and right the vertical mark post of machine tower body checks tower body guide rod, correction position, so as to make drilling rod perpendicular alignmnet Zhuan Wei centers,
Ensure that perpendicularity draws hole length less than 1.0%.
In the inventive method embodiment, in the drill pore formation step, the outer unit head is drilled with the top to form drilling,
The internally-powered head is drilled with the bottom to form drilling.
In the inventive method embodiment, at the uniform velocity slow-motion is used during drill, down-hole hammer is lifted up when the power that is hampered is big, is carried
Lift is from about 0.3 to 0.5m；Drilling depth is impacted with whirling vibration again, hole depth is drilled into 5 to 8m, and lifting screw rod excludes boring mud one
It is secondary, it is drilled into hole depth and is drilled into second of exclusion boring mud of 10m progress, continuing to drill to hole depth reaches design requirement.
In the inventive method embodiment, in the drill pore formation step, drilling parameter includes the pneumatics using 330HP
12Mpa air pressure is used in machine, drilling process, the ammeter parameter value into lithosphere is 220A, down-hole hammer atmospheric pressure value 2.41
To 3Mpa.
In the inventive method embodiment, in the drill pore formation step, when the pressure of the air compressor machine reaches 12Mpa,
Using air pressure borehole cleaning, to lift the efficiency that screw rod excludes boring mud.
In the inventive method embodiment, in the borehole cleaning step, when detection sediment thickness>, should be by down-hole hammer during 50mm
Hole is asked for the second time in tripping in hole again, until meeting actual requirement.
In the inventive method embodiment, in the borehole cleaning step, the down-hole hammer cephalic par is provided with slagging channel, cuts
Slag can be that medium is discharged on long screw drill rod by slagging channel using pressure wind, long screw drill rod be lifted, the slag got out can
It is immediately discharged to outside hole, completes the borehole cleaning of drilling.
It is 15 to 30m in the inventive method embodiment, between the arrangement of the dewatering well.
Brief description of the drawings
Fig. 1 is the configuration diagram of construction method of the present invention.
Fig. 2 is that construction depth and the geological conditions of dewatering well of the present invention compares schematic diagram.
Fig. 3 is the structural representation of steel floral tube of the present invention.
Fig. 4 is the plan cross-section structural representation of dewatering well of the present invention.
The corresponding relation of reference and part is as follows：
Steel floral tube 10；Dense mesh screen 11；Drilling 20；Top 21；Bottom 22；Filter material 30；Water pump 40；Drinking-water pipe 41.
Embodiment
For the benefit of to the understanding of the present invention, illustrated below in conjunction with drawings and Examples.
Please refer to shown in Fig. 1 to Fig. 4, the dewatering well in complex geological condition area of the present invention passes through into well construction method
Hole, embedding steel floral tube are drawn using reacting cycle, and the gap of steel floral tube and hole wall is backfilled with drainage aggregate, construction to bottom Cretaceous System
Pore-forming is continued using down-hole hammer after mud stone, until reaching the dewatering well bottom absolute altitude of design requirement.Whereby, by the way that reacting cycle is applied
Work, down-hole hammer construction technology connected applications, while the technique connected using improved steel floral tube as technology, is applied with improving into well
Work efficiency rate and into well success rate.
As shown in figure 1, being preferably 15 to 30m between the arrangement of dewatering well of the present invention.As shown in Fig. 2 the construction knot of the present invention
Structure includes steel floral tube 10, drilling 20, filter material 30 and water pump 40, wherein, the steel floral tube 10 is as shown in Figure 2, Figure 3, Figure 4, outside
Provided with Dense mesh screen 11；The drilling 20 includes top 21 and bottom 22；The water pump 40 passes through located at the bottom 22 of drilling 20
Drinking-water pipe 41 is communicated to outside the well head of dewatering well.
The step of concrete construction method of the present invention, is included using air down-hole hammer, screw air compressor, water pump, long spiral shell
The device such as rotary drill bar and steel floral tube carries out preparation of construction step, reacting cycle and draws hole step, embedded steel floral tube step, drill pore-forming step
Rapid and borehole cleaning step.
The preparation of construction step is specifically included：
1) it is smooth on construction ground to carry out construction lofting afterwards, construction control points are checked before setting-out, and set up at the construction field (site)
The permanent bench mark of dewatering well construction work, protection point position, and running check, anti-stop position is impaired or other reasonses are caused
Precise decreasing.
2) well point position position uses GPS setting-outs.
3) strict control into must make absolute altitude record after the completion of well absolute altitude, every mouthful of well.
4) according to control point measuring well location point, while being measured in the location not influenceed by well-digging and setting two permanent controls
It is processed, for checking axis correction point in work progress or checking well location.Wherein, construction axis must be strictly by design coordinate points
Pilot measurement, and confirm after repeatedly checking.Job site axial line control point position should be located at place not by well-digging j ob impact, and
It is protected by.
5) according to the well location map of design, well is numbered one by one by sequence of construction.
By the preparation of construction step, the progress to dewatering well well location accurately confirms, to ensure the spacing between dewatering well,
Improve the dewatering effect of dewatering well.
The reacting cycle draws hole step and specifically included：
1) by the centering in place of stake machine, in draw hole stake position set after by design requirement on pile center's point plug in a mark post, put well
Behind stake position, movement draws hole stake machine arrival and refers to fixed pile, and centering adjusts drilling rod perpendicularity.
2) by stake machine it is in place after, utilize before and after stake machine tower body and left and right vertical mark post check tower body guide rod, correction bit
Put, make drilling rod perpendicular alignmnet Zhuan Wei centers, it is ensured that the perpendicularity of drilling rod draws hole length less than 1.0%.Examined through administrative staff
It is qualified and enter next process.
3) when drilling starts, drill bit valve is first closed, when moving down drilling rod to drill bit and touching ground, starter motor is bored
Enter.It is preferred that it is fast after the rotating speed of rig is first slow, rocked with reducing drilling rod, and it is easy to check the deviation of drilling, to entangle in time
Just.In pore forming process, when such as finding that drilling rod rocks or is difficult to pierce, drilling depth should be slowed down, to avoid result in hole scattering, position
Situations such as moving, or even damage drilling rod, drilling tool.When drilling to completion, in the corresponding rig tower in unit head bottom surface stop place
It is in and makees eye-catching mark, is used as the long foundation of Construction control stake.During formal construction, when arrival mark stake in unit head bottom surface is long
Both design requirement is met.Also need to consider the cushion cap discrepancy in elevation during construction, make corresponding increase and decrease.
4) after the completion of the construction of a upper pile, repetition above step carries out the next position and draws hole.
It must ensure that long spire draws because down-hole hammer causes the probability of collapse hole too high in soft soil foundation construction, during construction
Hole leads to competent bed.Hole step is drawn by reacting cycle, long spire is drawn hole and ensures perpendicularity, further, drawing Kong Zhijian
Continue turn hole about 3 minutes after hard formation, to ensure that drawing hole leads to competent bed.
The embedded steel floral tube step is specifically included：
In the long spire drawing hole site of abovementioned steps formation, will in advance ready steel floral tube it is embedding, and in the spray of molten steel
Filled with hydrophobic microlith in the space managed and drawn between the hole wall of hole.Specifically, the steel floral tube can draw hole using the embedment of 220 excavators
It is interior.
In the embodiment of the present invention, Dense mesh screen is also wrapped on outside the steel floral tube.As shown in Figure 3, Figure 4, this hair is shown
The structural representation provided with 200 mesh Dense mesh screens 11 of bright steel floral tube 10；The external diameter of steel floral tube 10 of the present invention is preferably 200mm, institute
State long spire and draw the aperture in hole for 400mm.
Step is buried by steel floral tube, it is ensured that the embedment perpendicularity of steel floral tube and the retaining wall and water filtering function of steel floral tube.
The drill pore formation step is specifically included：
First start air compressor, when air pressure reaches 12Mpa pressure, down-hole hammer formation starts rig with whirling vibration
Intrinsic and external motive head carries out drill.To take and impact at a slow speed to prevent inclined hole, during perforate；220 excavators are needed to coordinate simultaneously
Set steel bushing, steel sleeve solve wellhole collapse hole, bit freezing or burying and upper strata drainage the problem of.Sleeve pipe is with down-hole hammer drilling depth
Outer unit head is closed after bedrock surface with proceeding to, is stopped with pipe, internally-powered headband down-hole hammer continuation drill enters rock to designing hole depth.
In the embodiment of the present invention, as shown in Fig. 2 the outer unit head is drilled with the top 21 to form the drilling 20, institute
State internally-powered head and be drilled with the bottom 22 to form the drilling 20；It is preferred that the aperture on 20 tops 21 of the drilling is 400mm, under
The aperture in portion 22 is 150mm, wherein burying a diameter of 200mm steel floral tubes simultaneously in the hole of top 21 that drilling 20 is 400mm in aperture
Filter material is set between the hole wall and steel floral tube 10 on 20 tops 21 that drill, and the drilling hole internal cause of 20 bottom 22 is in severely-weathered white
In chalk system sedimentary rock and middle weathering Cretaceous System sedimentary rock, therefore the open-hole for taking aperture to be 150mm is catchmented and draining.
In the embodiment of the present invention, the drill pore formation step also includes：
At the uniform velocity slow-motion is used during drill, down-hole hammer is lifted up when the power that is hampered is big, range of lift about 0.3 to 0.5m；
Drilling depth is impacted with whirling vibration again, hole depth is drilled into 5 to 8m, lifting screw rod excludes boring mud once, be drilled into hole depth and be drilled into 10m and
Second of exclusion boring mud of row, continuing to drill to hole depth reaches design requirement.
Further, when the pressure of air compressor machine reaches 12Mpa, using air pressure borehole cleaning 2 to 3 minutes, to lift screw rod
Exclude the efficiency of boring mud.
In the embodiment of the present invention, drilling parameter includes：Using 330HP air compressor machine；Using 12Mpa's in drilling process
Air pressure；Ammeter parameter value into lithosphere is 220A；Down-hole hammer atmospheric pressure value 2.41 is to 3Mpa.In addition, prohibiting in drilling process
Only mobile drill, will keep the stabilization of frame；Hole depth and bottom hole the sediment whole hole after examining and meeting the requirements.
In the embodiment of the present invention, by using air down-hole hammer, screw air compressor, water pump, long screw drill rod and
Steel floral tube realizes that the reacting cycle draws hole step, the steel floral tube and buries step and drill pore formation step.Specifically, the present invention is adopted
The rig model MZ150 of air down-hole hammer；Model LT-the 175A for the screw air compressor that the present invention is used, holds
Product flow 20m3/ min, quantity one, the need for meeting rock drilling, deslagging borehole cleaning；The quantity of the water pump is two, and power is
3KW；The long screw drill rod is used to lift deslagging, and the slag for the generation that drills is discharged by down-hole hammer mud hole；The steel floral tube is used
Good retaining wall effect and water filtering function are played between hole step and drill pore formation step to draw in reacting cycle, except preventing card
Outside brill, burying and raising drilling efficiency, while two kinds of dewatering well well drilling technologies can be connected.
More specifically, before steel floral tube enters rock stratum, down-hole hammer follow-up synchronous with steel floral tube should be kept, and to carry out
1~2 promotion long screw drill rod deslagging borehole cleaning, especially in bulk footpath, sand pebble layer is particularly important；Steel floral tube enters rock depth
It should control in the range of maximum enters lithosphere 20cm, to reduce the friction of steel floral tube and palisades, can also extend steel floral tube
The service life of drill bit.And after the completion of steel floral tube is embedded, such as hydrophobic fine sand filtrate is filled in time.
By the drill pore formation step, down-hole hammer draws hole through adjustment air compressor air pressure in time, so as to avoid because of gas
Press through big caused collapse hole phenomenon.
The borehole cleaning step is specifically included：
Drilling reach after design hole depth down-hole hammer bottom hole by air pressure borehole cleaning 2-3 minute with screw rod lifting exclusion sediment,
Hole depth meets with sediment thickness≤50mm and stopped after design requirement after testing.When detection sediment thickness>, should be by down-hole hammer during 50mm
Hole is asked for the second time in tripping in hole again, until meeting actual requirement.
Specifically, slagging channel is provided with rig down-hole hammer cephalic par, the slag cut can be medium using pressure wind by arranging
Slag passage is discharged on long screw drill rod, and long screw drill rod is lifted, and the slag got out can be immediately discharged to outside hole, completes the clear of drilling
Hole, after the cleaning by high-voltage high-speed pressure wind, bottom hole is cleaned, in the absence of sediment.
The dewatering well in complex geological condition area of the present invention is into well construction method, by being at top artificial earth fill, middle part
During 4th is the complicated geological of cohesive soil and layer of sand, hole is drawn using reacting cycle, embedding steel floral tube, and by between steel floral tube and hole wall
Gap is backfilled with drainage aggregate, and pore-forming is continued using down-hole hammer after construction to bottom Cretaceous System mud stone, until reaching the drop of design requirement
Well bottom absolute altitude, effectively improves into well construction efficiency and into well success rate.
In addition, dewatering well of the present invention into well construction method implement at the scene when, by be ready in advance reacting cycle draw hole and
Steel floral tube and two kinds of mechanical types of down-hole hammer, through reasonable arrangement working procedure, realization avoids drawing time slot process behind hole and caused
Collapse hole, the linking of two kinds of technique should be rationally timely.
The present invention is described in detail above in association with drawings and Examples, those skilled in the art can basis
Described above makes many variations example to the present invention.Thus, some of embodiment details should not constitute limitation of the invention,
The present invention regard the scope defined using appended claims as protection scope of the present invention.
Claims (10)
1. a kind of dewatering well in complex geological condition area is into well construction method, the geological conditions includes what artificial earth fill was formed
Top, the 4th are the middle part that cohesive soil and layer of sand are formed and the bottom that Cretaceous System mud stone is formed；Characterized in that, the precipitation
The step of well is into well construction method includes：
Preparation of construction step：After smooth on construction ground, construction control points are confirmed；According to the control point measuring well location point, and
Measured in the location not influenceed by well-digging and permanent control point is set；
Reacting cycle draws hole step：Movement draws hole stake machine arrival and refers to fixed pile centering and adjust long screw drill rod perpendicularity, drilling rod is hung down
Straight align piles position center；Drilled, when drilling to completion, at the corresponding rig tower body in unit head bottom surface stop place
Make eye-catching mark, be used as the long foundation of Construction control stake；After the completion of the construction of a upper pile, repeat above step and carry out next bit
Put and draw hole；
Steel floral tube buries step：In long screw drill rod boring procedure, down-hole hammer is set to rotate and vibrate with drilling rod, and then drive
The steel floral tube outside firm air down-hole hammer is placed in advance, before rock stratum is entered, follow-up synchronous with down-hole hammer is kept, by the spray of molten steel
Pipe is embedded to drawing hole site, and in steel floral tube and draws the space between the hole wall of hole and filled with hydrophobic microlith；
Drill pore formation step：First start the screw air compressor, when air pressure reaches preset pressure, down-hole hammer shakes with rotation
It is dynamic, start rig intrinsic and external motive head and carry out drill；The steel floral tube is made to close outer move with proceeding to behind rock stratum with down-hole hammer drilling depth
Power head, stops with pipe, and internally-powered head drives down-hole hammer to continue drill to enter rock stratum to designing hole depth；
Borehole cleaning step：Drilling reaches after design hole depth that down-hole hammer bottom hole is excluded by air pressure borehole cleaning to be lifted with long screw drill rod
Sediment；Hole depth meets with sediment thickness≤50mm and stopped after design requirement after testing.
2. the dewatering well in complex geological condition according to claim 1 area is into well construction method, it is characterised in that：
In the reacting cycle draws hole step, when drawing hole stake machine to described in, draw after hole stake position is set by design requirement in stake
A mark post is inserted on heart point.
3. the dewatering well in complex geological condition according to claim 1 area is into well construction method, it is characterised in that：
In the reacting cycle draws hole step, when adjusting the drilling rod perpendicularity, hanging down for before and after stake machine tower body and left and right is utilized
Straight mark post checks tower body guide rod, correction position, so as to make drilling rod perpendicular alignmnet Zhuan Wei centers, it is ensured that perpendicularity is drawn less than 1.0%
Hole length.
4. the dewatering well in complex geological condition according to claim 1 area is into well construction method, it is characterised in that：
In the drill pore formation step, the outer unit head is drilled with the top to form drilling, and the internally-powered head is drilled with to form brill
The bottom in hole.
5. the dewatering well in complex geological condition according to claim 1 area is into well construction method, it is characterised in that described
Drill pore formation step also includes：
At the uniform velocity slow-motion is used during drill, down-hole hammer is lifted up when the power that is hampered is big, range of lift about 0.3 to 0.5m；Again
Drilling depth is impacted with whirling vibration, hole depth is drilled into 5 to 8m, lifting screw rod excludes boring mud once, be drilled into hole depth and be drilled into 10m and carry out the
Secondary exclusion boring mud, continuing to drill to hole depth reaches design requirement.
6. the dewatering well in the complex geological condition area according to claim 1 or 6 is into well construction method, it is characterised in that：
In the drill pore formation step, drilling parameter is included in the air compressor machine using 330HP, drilling process using 12Mpa's
Air pressure, the ammeter parameter value into lithosphere is 220A, down-hole hammer atmospheric pressure value 2.41 to 3Mpa.
7. the dewatering well in the complex geological condition area according to claim 1 or 6 is into well construction method, it is characterised in that：
In the drill pore formation step, when the pressure of the air compressor machine reaches 12Mpa, using air pressure borehole cleaning, to lift spiral
Bar excludes the efficiency of boring mud.
8. the dewatering well in complex geological condition according to claim 1 area is into well construction method, it is characterised in that：
In the borehole cleaning step, when detection sediment thickness>During 50mm, second should will be carried out in down-hole hammer again tripping in hole please
Hole, until meeting actual requirement.
9. the dewatering well in the complex geological condition area according to claim 1 or 9 is into well construction method, it is characterised in that：
In the borehole cleaning step, the down-hole hammer cephalic par be provided with slagging channel, the slag cut can using pressure wind be medium by
Slagging channel is discharged on long screw drill rod, and long screw drill rod is lifted, and the slag got out can be immediately discharged to outside hole, completes drilling
Borehole cleaning.
10. the dewatering well in complex geological condition according to claim 1 area is into well construction method, it is characterised in that：
It is 15 to 30m between the arrangement of the dewatering well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN110566114B (en) * | 2019-09-04 | 2021-12-24 | 深圳市工勘岩土集团有限公司 | Hard rock drilling pile-forming construction method of rotary excavating cluster type down-the-hole hammer |
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