CN108729461A - For the constructing structure and construction method on aerial leakage stratum in deep hole impervious wall construction - Google Patents
For the constructing structure and construction method on aerial leakage stratum in deep hole impervious wall construction Download PDFInfo
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- CN108729461A CN108729461A CN201810726870.5A CN201810726870A CN108729461A CN 108729461 A CN108729461 A CN 108729461A CN 201810726870 A CN201810726870 A CN 201810726870A CN 108729461 A CN108729461 A CN 108729461A
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- steel pipe
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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
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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Abstract
For the constructing structure and construction method on aerial leakage stratum in deep hole impervious wall construction, belong to concrete cut Construction Technology in hydraulic and hydroelectric engineering.It includes the guide groove of cut-pff wall and cut-pff wall axis both sides, and key technology is the arrangement steel pipe stake holes on guide groove central axis, slip casting steel pipe is divided into steel pipe stake holes, perfusion mortar forms steel-pipe pile in slip casting steel pipe.Its construction method includes that stratum judges, drills, dividing into slip casting steel pipe and steel-pipe pile grouting.The present invention is directed to different stratum; steel-pipe pile layout density, depth are different; steel pipe plays the role of lockking boulder and sandy soil; filling, consolidation can be played fully to stratum weak link; prevent, reduce even slot is avoided in impervious wall construction to cave in, spillage, the accidents such as piping occur; to achieve the purpose that the Gu Bi protections of impervious wall construction slot, cut-pff wall grooving work efficiency is improved, reliable guarantee is provided for impervious wall construction quality and stability.
Description
Technical field
For the constructing structure and construction method on aerial leakage stratum in deep hole impervious wall construction, belong to hydraulic and hydroelectric engineering
Middle concrete cut Construction Technology.
Background technology
In hydraulic and hydroelectric engineering, concrete cut is as a kind of common Foundation Anti-seepage processing mode, in power station
It is widely applied in Deep Foundation Pit Anti-seeping technology, it can not but cofferdam underwater placement usually can be met in impervious wall construction
Grinding compacting backfills the bad grounds such as layer, aerial leakage stratum.Easily occur spillage in this kind of stratum impervious wall construction, collapse
The accidents such as hole, piping, especially when carrying out deep hole 50m and the above hole depth impervious wall construction, such stratum harm is particularly huge.
Extreme influence, but also accident treatment indefinite duration directly not only are caused to the safety of construction personnel's equipment and slot section once accident occurs
Ground extends the grooving period of cut-pff wall, seriously affects the normal progress of construction, increases cost input.
Impervious wall construction occurs that " backfill method " is generally used to be handled after accident, common " backfill method " processing practicability
It is relatively strong, but construction efficiency is extremely low；Under normal circumstances, slot accident of collapsing in impervious wall construction, which tends to occur at, leads wall lower part, and traditional
" backfill method " for slot occur collapsing slot, to miss the processing mode of subterranean formation zone be that backfill clay adds block building stones, utilize impact
Drilling machine repeated stock extruding keeps slot wall closely knit, often misses the region that caves in for one, will not only have become slot part and all backfill
To leading wall position and needing to be constructed repeatedly several times to ensure dense extrusion, this is to deep hole (50m grades or more) impervious wall construction pole
Its is unfavorable, and disturbs in pore-creating impact process larger, slot also easily collapse hole, spillage again.
Invention content
The problem to be solved in the present invention can not grinding compacting backfill aiming at deep hole (50m grades or more) cofferdam underwater placement
The bad grounds such as layer, aerial leakage stratum, provide a kind of structure and construction party that can safely and fast carry out impervious wall construction
Method.Its technical solution is as follows：
It includes the guide groove of cut-pff wall and cut-pff wall axis both sides, and key technology is the cloth on guide groove central axis
Steel pipe stake holes is set, slip casting steel pipe is divided into steel pipe stake holes, perfusion mortar forms steel-pipe pile in slip casting steel pipe.
The spacing of the steel pipe stake holes is 1.5m~2m.
In slip casting steel pipe walls plum blossom-shaped hole is processed at interval of 30cm~35cm.
The slip casting steel pipe uses screwed connection when increasing length.
Its construction method includes the following steps：
1) stratum judges；
2) drilling prepares：Before waiting for that guide groove pours after the completion of cut-pff wall guide groove excavates, along cut-pff wall guide groove central shaft
Line arranges steel pipe stake holes according to design spacing, and drilling machine prepares and in place；
3) it drills：After drilling machine is in place, it will be carried out first with reaming set off-balance bit center and the steel pipe stake holes of label positioning
To just, it is ensured that then borehole perpendicularity carries out pipe-following drilling to designing hole depth；
4) slip casting steel pipe is divided into：It drills after acceptance(check), slip casting steel pipe is divided into steel pipe stake holes, slip casting steel pipe is suitable for reading super
Go out the height of 1 50~60cm of bottom of guide groove；
5) steel-pipe pile is in the milk：Without pressurization when mortar depositing construction, only slurries need to be delivered to slip casting steel pipe hole using grouting pump
Mouthful, using in mortar dead weight injection hole, wait for that slurries fill steel pipe stake holes, aperture pulp surface no longer declines, and stops slip casting, is formed
Steel-pipe pile.
Compared with prior art, the invention has the advantages that：
1, layer is backfilled with the cofferdam that routine cut-pff wall carries out during grooving, is missed compared with Stilt layer treatment process,
The present invention handles constructing structure using advanced inoculated mortar steel-pipe pile stratum consolidation, by steel-pipe pile perfusion mortar, for difference
Stratum, steel-pipe pile layout density, depth are different, and steel pipe plays the role of lockking boulder and sandy soil, to stratum weak link energy
Fully play filling, consolidation, improve stratum globality, prevent, reduce even avoid in impervious wall construction slot from caving in,
The accidents such as spillage, piping occur, and to achieve the purpose that the Gu Bi protections of impervious wall construction slot, improve cut-pff wall grooving work efficiency, are
Impervious wall construction quality and stability provide reliable guarantee.
2, the structure prevents, reduces and even avoid that slot in impervious wall construction caves in, spillage, the accidents such as piping occur,
So reducing the wasting of resources caused by process accident, construction cost has been saved.
3, the use of the structure so that construction quickly, securely and reliably, accelerates construction speed, reduces construction cost.
4, the structure is suitable for 50m grades or more deep hole impervious wall construction.
Description of the drawings
Fig. 1 is planar structure schematic diagram of the present invention；
Fig. 2 is Figure 1A-A cross-sectional views.
Specific implementation mode
The invention will be further described With reference to embodiment, and specific implementation mode is to the principle of the invention
It further illustrates, does not limit the invention in any way, protected without departing from the present invention with the same or like technology of the present invention
Range.
Referring to Fig. 1, Fig. 2, the present invention includes the guide groove 1 of 4 both sides of cut-pff wall and cut-pff wall axis, key technology be
Steel pipe stake holes 3 is arranged on guide groove central axis 2, divides into slip casting steel pipe 5 in steel pipe stake holes 3, perfusion mortar shape in slip casting steel pipe 5
At steel-pipe pile.
The spacing of the steel pipe stake holes 3 is 1.5m~2m.
The slip casting steel pipe 5 is made of the steel pipe of Φ 89mm.
A diameter of 2cm plum blossom-shapeds hole 6 is processed using oxygen welding at interval of 30cm~35cm in slip casting steel pipe walls, so as to
Slip casting effect is improved, slurries radiation scope is increased.
The length of the slip casting steel pipe 5 is 6m~8m according to construction hole depth setting, general joint length.
The upper and lower slip casting steel pipe 5 increases length using screwed connection.
2 connection reinforcement reinforcing bars are arranged in outside at screwed connection when the slip casting steel pipe 5 increases length, to prevent from dividing into
Pipe fitting falls off in the process.
The slip casting steel pipe 5 height suitable for reading beyond 1 50~60cm of bottom of guide groove is cast in after the completion of later stage slip casting and leads
Increase the stability of steel-pipe pile into slot 1.
Construction method in deep hole impervious wall construction for aerial leakage stratum includes the following steps：
1) stratum judges：Early period fills property according to construction part cofferdam and design exploration data determines construction stratum property
Shape, judgement need pretreated construction area, stake spacing and hole depth are determined according to specific geological condition；
2) drilling prepares：Before waiting for that guide groove pours after the completion of cut-pff wall guide groove excavates, along cut-pff wall guide groove central shaft
For line 2 according to design spacing 1.5m~2m arrangements steel pipe stake holes 3, positioning is marked using lime in drill center, drilling machine preparation and
In place；
3) drilling device：To improve construction efficiency, Atlas A66CBT type all hydraulic caterpillar drilling machines is selected to match English lattice
Suo Lan XHP900WCAT air compressor machines carry out drilling construction；
4) aperture：Φ 140mm casing drilling pore-formings are coordinated using the off-balance bit of Φ 127mm；
5) centering type bore process drills：After drilling machine is in place, first by the band reaming set off-balance bit centers φ 127mm and mark
The steel pipe stake holes 3 of note positioning is carried out to just, being checked using horizon rule, it is ensured that then borehole perpendicularity carries out pipe-following drilling, utilize
" Weight type " inclinometer carries out hole deviation detection in drilling, it is found that hole scattering is rectified a deviation at once, and so cycle drilling is to setting
Count hole depth；
6) slip casting steel pipe is divided into：It drills after acceptance(check), according to depth difference, centering corrects upper and lower two slip casting steel pipes 5
Verticality, after deviation proportion meets the requirements, slip casting steel pipe 5 using crane or is manually divided into steel pipe stake holes 3 at the scene；Slip casting
The steel pipe height suitable for reading beyond 1 50~60cm of bottom of guide groove, later stage slip casting completion grouting behind shaft or drift lining steel pipe, which is cast in guide groove 1, to be increased
Add the stability of steel-pipe pile；
The slip casting steel pipe 5 is made of the steel pipe of Φ 89mm, and joint length is generally 6m.
In slip casting steel pipe walls a diameter of 2cm plum blossom-shapeds hole 6 is processed using oxygen welding at interval of 30cm~35cm.
To reach 5 length of slip casting steel pipe in one's power, 5 initial and end end of slip casting steel pipe can be increased its length using screwed connection.
To prevent pipe fitting during dividing into from falling off, increase by 5 length of slip casting steel pipe screwed connection on the outside of be arranged 2 company
Connect stiffener fastening.
7) steel-pipe pile is in the milk：Using 1 mixing upper flow regime mortar of J-400 high-speed pulping machines, the sandstone that slip casting uses is matter
The hard natural or mechanism medium-fine sand in ground, grain size are not more than 2.5mm, and fineness modulus is not more than 2.0, and clay content is not more than 3%,
SO3 contents are less than 1%, and content of organics is not more than 3%；Grouting equipment uses pressure variable amount grouting pump in TTB100/20 to convey water
Slurries only need to be delivered to slip casting steel pipe aperture using grouting pump, utilize mortar by cement mortar without pressurization when mortar depositing construction
Conduct oneself with dignity in injection hole, cause grout spreading range excessive to avoid pressure is excessive, cause the unnecessary wasting of resources, waits for that slurries are noted
Full steel pipe stake holes, aperture pulp surface no longer decline, and stop slip casting, form steel-pipe pile.
The drilling form of the centering type casing drilling tool hole forming method is impact rotating form, the brill of centering type bore process
Tool is made of (virtual calibrator for instrument transformer, center bit, off-balance bit) three-piece drilling tool.Drilling process is to impact bottom rock by center bit
Churn drill is into off-balance bit carries out reaming to the catalase around hole wall, and virtual calibrator for instrument transformer drives the principle pore-forming of outer wall casing follow-up；
After drilling to projected depth, reversed turning drilling rod withdraws off-balance bit, extraction drilling rod, drilling tool pore-forming.
Claims (9)
1. for the constructing structure on aerial leakage stratum, including cut-pff wall and cut-pff wall axis in a kind of deep hole impervious wall construction
(4) guide groove (1) of both sides, it is characterized in that steel pipe stake holes (3) is arranged on guide groove central axis (2), in steel pipe stake holes (3)
Slip casting steel pipe (5) is divided into, the interior perfusion mortar of slip casting steel pipe (5) forms steel-pipe pile.
2. according to claim 1 for the constructing structure on aerial leakage stratum in deep hole impervious wall construction, it is characterized in that steel
The spacing of hole of post (3) is 1.5m~2m.
3. according to claim 1 for the constructing structure on aerial leakage stratum in deep hole impervious wall construction, it is characterized in that note
Slurry steel pipe (5) is made of the steel pipe of Φ 89mm.
4. according to claim 1 for the constructing structure on aerial leakage stratum in deep hole impervious wall construction, it is characterized in that
At interval of 30cm~35cm processing plum blossom-shaped holes (6) in slip casting steel pipe walls.
5. according to claim 1 for the constructing structure on aerial leakage stratum in deep hole impervious wall construction, it is characterized in that note
The joint length for starching steel pipe (5) is 6~8m.
6. according to claim 1 for the constructing structure on aerial leakage stratum in deep hole impervious wall construction, it is characterized in that note
It starches steel pipe (5) and uses screwed connection.
7. according to claim 6 for the constructing structure on aerial leakage stratum in deep hole impervious wall construction, it is characterized in that note
It starches outside at steel pipe (5) screwed connection and connection reinforcement reinforcing bar is set.
8. according to claim 1 for the constructing structure on aerial leakage stratum in deep hole impervious wall construction, it is characterized in that note
Starch steel pipe (5) height suitable for reading beyond 1 50~60cm of bottom of guide groove.
9. for the construction method on aerial leakage stratum in deep hole impervious wall construction described in claim 1, it is characterised in that including
Following steps：
1) stratum judges；
2) drilling prepares：Before waiting for that guide groove pours after the completion of cut-pff wall guide groove excavates, along cut-pff wall guide groove central axis (2)
According to design spacing arrangement steel pipe stake holes (3), drilling machine prepares and in place；
3) it drills：After drilling machine is in place, off-balance bit center will be covered with reaming first and the steel pipe stake holes (3) of label positioning carries out pair
Just, it is ensured that then borehole perpendicularity carries out pipe-following drilling to designing hole depth；
4) slip casting steel pipe is divided into：It drills after acceptance(check), divides into slip casting steel pipe (5) into steel pipe stake holes (3), slip casting steel pipe is suitable for reading
Height beyond guide groove (1) 50~60cm of bottom；
5) steel-pipe pile is in the milk：Without pressurization when mortar depositing construction, only slurries need to be delivered to slip casting steel pipe aperture i.e. using grouting pump
Can, using in mortar dead weight injection hole, wait for that slurries fill steel pipe stake holes, aperture pulp surface no longer declines, and stops slip casting, forms steel pipe
Stake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810726870.5A CN108729461A (en) | 2018-07-04 | 2018-07-04 | For the constructing structure and construction method on aerial leakage stratum in deep hole impervious wall construction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810726870.5A CN108729461A (en) | 2018-07-04 | 2018-07-04 | For the constructing structure and construction method on aerial leakage stratum in deep hole impervious wall construction |
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| CN108729461A true CN108729461A (en) | 2018-11-02 |
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| CN201810726870.5A Pending CN108729461A (en) | 2018-07-04 | 2018-07-04 | For the constructing structure and construction method on aerial leakage stratum in deep hole impervious wall construction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645858A (en) * | 2019-10-12 | 2020-01-03 | 中国水电基础局有限公司 | Pretreatment method for grooving construction of anti-seepage wall of dam plug body |
| CN110747848A (en) * | 2019-10-24 | 2020-02-04 | 湖北盛达泰水利水电工程有限公司 | Construction method of gravel layer foundation deep cement mixing pile diaphragm wall |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645858A (en) * | 2019-10-12 | 2020-01-03 | 中国水电基础局有限公司 | Pretreatment method for grooving construction of anti-seepage wall of dam plug body |
| CN110645858B (en) * | 2019-10-12 | 2024-02-02 | 中国水电基础局有限公司 | Pretreatment method for dam body impervious wall grooving construction |
| CN110747848A (en) * | 2019-10-24 | 2020-02-04 | 湖北盛达泰水利水电工程有限公司 | Construction method of gravel layer foundation deep cement mixing pile diaphragm wall |
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