CN109371987A - Pre-stress anti-slide pile supporting comprehensive construction method in a kind of back fill course - Google Patents
Pre-stress anti-slide pile supporting comprehensive construction method in a kind of back fill course Download PDFInfo
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- CN109371987A CN109371987A CN201811209726.0A CN201811209726A CN109371987A CN 109371987 A CN109371987 A CN 109371987A CN 201811209726 A CN201811209726 A CN 201811209726A CN 109371987 A CN109371987 A CN 109371987A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses pre-stress anti-slide pile supporting comprehensive construction methods in a kind of back fill course, this method comprises: work surface is excavated and levelling of the land；Construction friction pile and breast boards, pre-buried anchor cable perforation casing；After stake below backfill to anchor cable face；Anchor cable drilling, lashing and slip casting；Anchor cable wears rigid protective casing；Anchorage cable stretching；Rank backfilling of earthwork on anchor cable；Anchor cable mends tensioning, detection and sealing off and covering anchorage；The present invention solve collapse hole when constructing anchor cable in backfill cause anchor cable can not the problems such as lashing and slip casting is discontented, anchor cable hole deviations, longer anchor rope grouting tensioning period, guarantee anchor cable construction quality, shorten construction period, save the cost.
Description
Technical field
The present invention relates to pre-stress anti-slide pile supporting comprehensive construction method in a kind of back fill course, be particularly suitable for by
Place limitation carries out backfill after needing excavation slope construction friction pile again, or height difference is usually larger up and down, and operation side is relatively narrow
Pre-stress anti-slide pile engineering.
Background technique
Currently, mountain area tableland slope retaining form is more, the scale of construction is larger, especially by place limited can not slope processing forever
Long property side slope generallys use pre-stress anti-slide pile slope retaining, such supporting shape if road is other, narrow landform equipotential is set
Formula is limited by place, need excavation slope construct friction pile after carry out backfill again, upper and lower height difference is usually larger, operation side compared with
It is narrow, it is affected to road traffic and surrounding enviroment.
Conventional construction technology is that crosshead construction anchor cable is set up on the outside of friction pile after constructing friction pile and backfill,
This construction technology need to set up a large amount of crossheads, and prestress anchorage cable of constructing in back fill course after stake, face since collapse hole causes
The problems such as drilling can not be crept into, anchor cable lashing is difficult, slip casting is discontented, while by anchor rope grouting technique intermittent effects, anchorage cable stretching
It cannot be inserted into time, influence subsequent handling construction；Before anchor cable work, backfill earth lateral pressure is also possible to damage pile body.
If backfill anchor cable work after carry out, by anchor cable effect of distance, backfill work surface becomes smaller, be unfavorable for anchor cable at
Product protection and backfill construction, and backfill can disturb the generation of stretch-draw anchor during being backfilling and compacted, construction quality
It is difficult to control.
Summary of the invention
It is an object of the invention to solve the key problem in above-mentioned construction technology, prestressing force in a kind of back fill course is provided
Anchor anti-slide piles supporting comprehensive construction method.
The purpose of the present invention is achieved by following technical proposals:
Pre-stress anti-slide pile supporting comprehensive construction method in a kind of back fill course, which includes following
Step:
(1) it carries out excavating smooth formation work surface in natural hill side slope；
(2) support bracket is built in side slope work surface carry out friction pile, bulkhead construction；Anchor cable is perforated sleeve pipe pre-embedding simultaneously
In friction pile:
(3) anchor cable lashing, mortar depositing construction are completed after the opposite side slope work surface of friction pile is drilled；
(4) backfill construction is carried out under anchor cable face；
(5) the exposed anchor cable free end of side slope is passed through and reserves perforation casing in stake and carries out anchorage cable stretching process；
(6) one layer of anchor cable face is judged whether there is, if there is then return step (3)；Otherwise enter in next step；
(7) anchor cable mends tensioning, detection and sealing off and covering anchorage.
The friction pile work progress:
2.1 since place limits, and friction pile generallys use manual pore-forming's rectangular pile, and primary concreting is completed；Below ground
Using reinforced concrete core-tube manually digging hole pore-forming；
The used ratio of reinforcement of 2.2 friction piles is higher, and bar diameter is larger, and quantity is more, therefore carries out main reinforcement in the venue
Processing connection, is hung in hole using truck crane by root, framework of steel reinforcement welding installation is carried out in hole, while binding compound stirrup,
Pre-buried breast boards horizontal reinforcement；
2.3, in design height position, install anchor cable casing, casing uses seamless steel pipe, with level or tape measure in antiskid
Telltale mark casing absolute altitude in stake main reinforcement adjusts casing tilt angle with dedicated angle measurement device, and casing and reinforcement welding are solid
It is fixed, and sealed casing two sides hole with cystosepiment；
2.4 after reinforcing bar binding, from friction pile fore shaft position, set up double crosshead, pacify according to design size
Decking, template use set shaped steel formwork, interior plus 2~3 M16 split bolts, the double steel pipe anchor ear clamping die of external application spacing 250
Plate；
2.5 pour antiskid pile concrete, and one-time-concreting batch is not less than 3 piles, and every pile answers placement layer by layer, one-time-concreting
Depth is no more than 2m, and concreting should be continuous, there is not allowed that construction joint；
2.6 concrete reach after some strength (>=1.5Mpa), can remove friction pile template, and watering is covered in time after demoulding
Lid maintenance, while the breast boards that can construct according to design drawing.
When antiskid pile driving construction, pre-buried anchor cable perforation casing, angular deviation is no more than 2 °, and deviations are no more than 5mm.
The anchor cable drilling, lashing and slip casting process:
4.1 set up anchor cable drilling platform in back fill course, project anchor cable hole location in slope surface with anchor cable angle positioning device,
Drilling machine is set up, bore angle is adjusted, is drilled into weathered rock formation in work surface according to design；
4.2 anchor cables use 6 beamsSteel strand wires composition, anchors 6~8m of segment length, and anchor cable front end adds guiding cap, with
Anchor cable is welded and fixed, interior packing reality cement mortar, and centering bracket and lock ring ring is arranged every the interval 0.4m~0.6m in anchoring section, will
Centering bracket of the Grouting Pipe in the middle part of anchor cable passes through, and extends to anchoring section front end；Free section of anchor cable smears Huang after carrying out preservative treatment
Oil, then housing PVC bellows, anchor cable are intercepted according to actual borehole depth scene, need to lengthen on theoretical length 70cm so as to
Anchorage cable stretching；
4.3 bind after the assay was approved to anchor cable length, straight degree, centering bracket, Grouting Pipe, carry out anchor cable and enter hole, anchor cable
It is promoted by anchor hole inclination angle, it is smooth when propulsion, if being unable to reach projected depth in progradation, anchor cable steadily be extracted
Afterwards, borehole cleaning again, until being installed in place；
After 4.4 anchor cables are installed, borehole cleaning slip casting is carried out immediately, and grouting material presses M35 cement mortar mix ratio ingredient, uses
Stop grouting plug is arranged in slip casing by pressure, the preceding aperture of slip casting, and grouting pressure is 0.5~1Mpa, until fresh slurry is overflowed in slip casting to aperture；
A slurries are mended after slip casting 30~45 minutes again.
Anchor cable drills hole location deviation no more than 5mm, and angular deviation is no more than 2 °；Anchor rope grouting slurry uses cement mortar,
Appropriate early strength agent and micro-expanding agent can be mixed；Preservative treatment is done in anchor cable free end, and passes through soap-free emulsion polymeization PVC hose protection sleeve pipe.
Described sleeve pipe is the seamless steel pipe of DN100, and casing is laid in backfill face, and casing central axes and anchor cable central axes exist
Same vertical plane, height are higher than anchor cable central axes 10mm, and tilt angle is embedded to primary side with anchor cable tilt angle, protection sleeve pipe
It is not less than 100mm in the soil layer of slope and in friction pile service sleeve.
The anchorage cable stretching process: when slip casting slurry and friction pile reach design strength 75% after carry out tensioning, use
Hand oil pump and jack system are loaded, and pre- tensioning is carried out before formal tensioning, take 10%~20% design tensile load,
To anchorage cable stretching 1~2 time, keeping its each location contacts close, keep steel strand wires totally straight, uniform force, tensioning should be loaded gently,
Loading speed is not preferably greater than 0.1Nk/min.
5 applications of anchorage cable stretching load point, successively take 0.2,0.5,0.75,1.00,1.1 times of design value to be opened step by step
It draws, preceding level Four holds lotus 5 minutes, and afterbody holds lotus 15 minutes, and every grade of load tensioning answers off-load 10% after holding lotus.
The anchor cable mends stretching process: after the completion of backfill, checking anchorage cable anchoring situation by root, carries out anchor cable benefit
It draws；Anchor cable detection determines that qualification rate, detection method detect tensioning value with anchorage cable stretching process, anchor cable using on-site measurement latching force
For 1.2~1.4 times for designing latching force；After detection is qualified, anchorage exposed parts steel strand wires are reserved using abrasive wheel cutting machine
It is cut off after 50mm, to anchor pier brushing antirust paint, finally formwork pours C35 concrete sealing off and covering anchorage again.
Beneficial effect
1, the present invention can be inserted into construction in advance by anchor cable, it is ensured that the slip casting intensity before anchorage cable stretching meets design and wants
It asks, so as to shorten construction period.
2, the present invention can effectively solve after friction pile when constructing prestress anchorage cable in back fill course, since collapse hole causes to bore
The problems such as hole can not be crept into, anchor cable lashing is difficult, slip casting is discontented；Backfill can effectively be solved during being backfilling and compacted to
The disturbance of stretch-draw anchor can effectively control the anchoring effect of anchor cable.
3, prestress anchorage cable can work before comprehensive backfill in the present invention, reduce backfill earth lateral pressure to cantilever
The influence of friction pile；Setting up for crosshead on the outside of stake, the safety wind for reducing cost and constructing on high crosshead are reduced simultaneously
Danger reduces the influence to external environment.
4, using this construction technology, speed of application is fast, applicability and strong operability, and safety reliability is high, reduces labour
Intensity saves human and material resources.
Detailed description of the invention
Fig. 1 is pre-stress anti-slide pile supporting comprehensive construction method flow diagram in a kind of back fill course of the present invention.
Fig. 2 is applicable elements schematic diagram of the invention.
Fig. 3 is supporting sectional schematic diagram provided by the present invention.
Fig. 4 is supporting section drawing provided by the present invention.
Fig. 5 is the flat schematic diagram in slope excavating field provided by the present invention.
Fig. 6 is friction pile and service sleeve construction schematic diagram provided by the present invention.
Fig. 7 is the first rank anchor cable lashing provided by the present invention and slip casting schematic diagram.
Fig. 8 is the first rank backfill schematic diagram provided by the present invention.
Fig. 9 is the first rank anchor cable sleeve-penetrating schematic diagram provided by the present invention.
Figure 10 is anchor second-order cable drilling hole provided by the present invention and the first rank anchorage cable stretching schematic diagram.
Figure 11 is second-order anchor cable lashing provided by the present invention and slip casting schematic diagram.
Figure 12 is second-order backfill schematic diagram provided by the present invention.
Figure 13 is second-order anchor cable sleeve-penetrating schematic diagram provided by the present invention.
Figure 14 is second-order anchorage cable stretching schematic diagram provided by the present invention.
Figure 15 is second-order backfill schematic diagram provided by the present invention.
Figure 16 is anchor cable sealing off and covering anchorage schematic diagram provided by the present invention.
Specific embodiment
Technical solution of the present invention is described further in conjunction with attached drawing 1.
As shown in Figure 1, the present invention provides pre-stress anti-slide pile supporting comprehensive construction method in a kind of back fill course,
(1) 101 carries out excavating smooth formation work surface in natural hill side slope；
(2) 102, which build support bracket in side slope work surface, carries out friction pile, bulkhead construction；Anchor cable is perforated casing simultaneously
It is embedded in friction pile: the friction pile work progress:
2.1 since place limits, and friction pile generallys use manual pore-forming's rectangular pile, and primary concreting is completed；Below ground
Using reinforced concrete core-tube manually digging hole pore-forming；
The used ratio of reinforcement of 2.2 friction piles is higher, and bar diameter is larger, and quantity is more, therefore carries out main reinforcement in the venue
Processing connection, is hung in hole using truck crane by root, framework of steel reinforcement welding installation is carried out in hole, while binding compound stirrup,
Pre-buried breast boards horizontal reinforcement；
2.3, in design height position, install anchor cable casing, casing uses seamless steel pipe, with level or tape measure in antiskid
Telltale mark casing absolute altitude in stake main reinforcement adjusts casing tilt angle with dedicated angle measurement device, and casing and reinforcement welding are solid
It is fixed, and sealed casing two sides hole with cystosepiment；
2.4 from friction pile fore shaft position, setting up double crosshead after reinforcing bar binding, pacifying according to design size
Decking, template use set shaped steel formwork, interior plus 2~3 M16 split bolts, the double steel pipe anchor ear clamping die of external application spacing 250
Plate；
2.5 pour antiskid pile concrete, and one-time-concreting batch is not less than 3 piles, and every pile answers placement layer by layer, one-time-concreting
Depth is no more than 2m, and concreting should be continuous, there is not allowed that construction joint；
2.6 concrete reach after some strength (>=1.5Mpa), can remove friction pile template, and watering is covered in time after demoulding
Lid maintenance, while the breast boards that can construct according to design drawing.
(3) 103 complete anchor cable lashing, mortar depositing construction after the opposite side slope work surface of friction pile is drilled；
The anchor cable drilling, lashing and slip casting process:
4.1 set up anchor cable drilling platform in back fill course, project anchor cable hole location in slope surface with anchor cable angle positioning device,
Drilling machine is set up, bore angle is adjusted, is drilled into middle weathered rock formation according to design；
4.2 anchor cables use 6 beamsSteel strand wires composition, anchors 6~8m of segment length, and anchor cable front end adds guiding cap, with
Anchor cable is welded and fixed, interior packing reality cement mortar, and centering bracket and lock ring ring is arranged every the interval 0.4m~0.6m in anchoring section, will
Centering bracket of the Grouting Pipe in the middle part of anchor cable passes through, and extends to anchoring section front end；Free section of anchor cable smears Huang after carrying out preservative treatment
Oil, then housing PVC bellows, anchor cable are intercepted according to actual borehole depth scene, need to lengthen on theoretical length 70cm so as to
Anchorage cable stretching；
4.3 bind after the assay was approved to anchor cable length, straight degree, centering bracket, Grouting Pipe, carry out anchor cable and enter hole, anchor cable
It is promoted by anchor hole inclination angle, it is smooth when propulsion, if being unable to reach projected depth in progradation, anchor cable steadily be extracted
Afterwards, borehole cleaning again, until being installed in place；
After 4.4 anchor cables are installed, borehole cleaning slip casting is carried out immediately, and grouting material presses M35 cement mortar mix ratio ingredient, uses
Stop grouting plug is arranged in slip casing by pressure, the preceding aperture of slip casting, and grouting pressure is 0.5~1Mpa, until fresh slurry is overflowed in slip casting to aperture；
A slurries are mended after slip casting 30~45 minutes again.Anchor cable drills hole location deviation no more than 5mm, and angular deviation is no more than 2 °；Anchor cable
Slip casting slurry uses cement mortar, can mix appropriate early strength agent and micro-expanding agent；Preservative treatment is done in anchor cable free end, and passes through nothing
Bond PVC hose protection sleeve pipe.
(4) 104 carry out backfill construction under anchor cable face；The backfill process: it is filled to anchor cable central axes or less 50mm
10mm is reserved as settling amount in place, it is desirable that be backfilling and compacted coefficient not less than design value.
The exposed anchor cable free end of side slope is passed through reserved perforation casing in stake and carries out anchorage cable stretching process by (5) 105；
The anchorage cable stretching process: when slip casting slurry and friction pile reach design strength 75% after carry out tensioning, use
Hand oil pump and jack system are loaded, and pre- tensioning is carried out before formal tensioning, take 10%~20% design tensile load,
To anchorage cable stretching 1~2 time, keeping its each location contacts close, keep steel strand wires totally straight, uniform force, tensioning should be loaded gently,
Loading speed is not preferably greater than 0.1Nk/min.5 applications of anchorage cable stretching load point, successively take 0.2,0.5,0.75,1.00,1.1 times
Design value carries out tensioning step by step, and preceding level Four holds lotus 5 minutes, and afterbody holds lotus 15 minutes, and every grade of load tensioning should unload after holding lotus
Lotus 10%.
(6) 106 judge whether there is one layer of anchor cable face, if there is then return step (3)；Otherwise enter in next step；
(7) 107 anchor cables mend tensioning, detection and sealing off and covering anchorage.The anchor cable mends stretching process: after the completion of backfill, examining by root
Anchorage cable anchoring situation is looked into, anchor cable is carried out and mends tensioning；Anchor cable detection determines that qualification rate, detection method are same using on-site measurement latching force
Anchorage cable stretching process, anchor cable detection tensioning value are 1.2~1.4 times for designing latching force；After detection is qualified, using abrasive wheel cutting machine
It is cut off after anchorage exposed parts steel strand wires are reserved 50mm, to anchor pier brushing antirust paint, finally formwork pours C35 coagulation grave again
Anchor.
As shown in Fig. 2, in a kind of back fill course pre-stress anti-slide pile supporting comprehensive construction method applicable elements.
As shown in figure 3, pre-stress anti-slide pile supporting comprehensive construction method in a kind of back fill course, supporting construction packet
Containing friction pile 10, backfill 11, anchor cable 1, centering bracket 2, tighten hoop, guiding cap 4, PVC hose 5, seamless steel pipe 6, pre-buried set
Pipe 7, anchor plate 8, anchorage 9.
As shown in figure 4, diagram full-page proof node is supporting construction full-page proof.
As shown in figure 5, place excavate smooth, naturally stable side slope is formed after excavation.
As shown in fig. 6, construction friction pile and breast boards, require pre-buried anchor cable perforation casing according to design drawing.
As shown in fig. 7, setting up crosshead, anchor cable drilling construction is carried out；And anchor cable production, lashing, mortar depositing construction are carried out, and
Exposed parts anchor cable is temporarily fixed in side slope, prevents backfill from disturbing.
As shown in figure 8, carrying out the construction of the first rank backfill, backfill is filled to the first rank anchor cable face or less.
As shown in figure 9, anchor cable is passed through seamless steel pipe protection sleeve pipe, protection sleeve pipe is embedded in the soil layer of primary side slope and friction pile
It is not less than 100mm in service sleeve.
As shown in Figure 10, after slip casting intensity reaches design tensioning requirement, anchorage cable stretching is carried out；Operation is set up simultaneously, into
Row second-order anchor cable drilling construction.
As shown in figure 11, the production of second-order anchor cable, lashing, mortar depositing construction are carried out；And exposed parts anchor cable is fixed temporarily
In in side slope.
As shown in figure 12, the construction of second-order backfill is carried out, backfill is filled to second-order anchor cable face or less.
As shown in figure 13, second-order anchor cable is passed through into seamless steel pipe protection sleeve pipe, protection sleeve pipe is embedded in the soil layer of primary side slope
And it is not less than 100mm in friction pile service sleeve.
As shown in figure 14, after slip casting intensity reaches design tensioning requirement, anchorage cable stretching is carried out.
As shown in figure 15, remaining backfill earthen backfill is carried out.
As shown in figure 16, it carries out anchor cable and mends tensioning and detection, sealing off and covering anchorage is carried out after detection is qualified, construction is completed.
In practical operation, process adjustment can be carried out according to scene, as anchor cable drilling, lashing, slip casting can be same with friction pile
When construct, shorten technique interval；After can also carrying out lower rank backfill, anchor cable drilling is carried out on back fill course, is reduced anchor cable and is applied
Work crosshead is set up.
Claims (10)
1. pre-stress anti-slide pile supporting comprehensive construction method in a kind of back fill course, which is characterized in that the integrated construction side
Method the following steps are included:
(1) it carries out excavating smooth formation work surface in natural hill side slope；
(2) support bracket is built in side slope work surface carry out friction pile, bulkhead construction；Simultaneously by anchor cable perforation sleeve pipe pre-embedding anti-
In sliding pile:
(3) anchor cable lashing, mortar depositing construction are completed after the opposite side slope work surface of friction pile is drilled；
(4) backfill construction is carried out under anchor cable face；
(5) the exposed anchor cable free end of side slope is passed through and reserves perforation casing in stake and carries out anchorage cable stretching process；
(6) one layer of anchor cable face is judged whether there is, if there is then return step (3)；Otherwise enter in next step；
(7) anchor cable mends tensioning, detection and sealing off and covering anchorage.
2. pre-stress anti-slide pile supporting comprehensive construction method, feature exist in back fill course according to claim 1
In: the friction pile work progress:
2.1 since place limits, and friction pile generallys use manual pore-forming's rectangular pile, and primary concreting is completed；Below ground uses
Reinforced concrete core-tube manually digging hole pore-forming；
The used ratio of reinforcement of 2.2 friction piles is higher, and bar diameter is larger, and quantity is more, therefore carries out the processing of main reinforcement in the venue
Connection, is hung in hole using truck crane by root, framework of steel reinforcement welding installation is carried out in hole, while binding compound stirrup, pre-buried
Breast boards horizontal reinforcement；
2.3, in design height position, install anchor cable casing, casing uses seamless steel pipe, with level or tape measure in friction pile master
Telltale mark casing absolute altitude on muscle adjusts casing tilt angle with dedicated angle measurement device, and casing is fixed with reinforcement welding, and
Casing two sides hole is sealed with cystosepiment；
2.4 after reinforcing bar binding, from friction pile fore shaft position, set up double crosshead, install mould according to design size
Plate, template use set shaped steel formwork, and the double steel pipe anchor ear of interior plus 2~3 M16 split bolts, external application spacing 250 clamps template；
2.5 pour antiskid pile concrete, and one-time-concreting batch is not less than 3 piles, and every pile answers placement layer by layer, one-time-concreting depth
No more than 2m, concreting should be continuous, there is not allowed that construction joint；
2.6 concrete reach after some strength (>=1.5Mpa), can remove friction pile template, and watering covering in time is supported after demoulding
Shield, while the breast boards that can construct according to design drawing.
3. pre-stress anti-slide pile supporting comprehensive construction method, feature exist in back fill course according to claim 2
In: when antiskid pile driving construction, pre-buried anchor cable perforation casing, angular deviation is no more than 2 °, and deviations are no more than 5mm.
4. pre-stress anti-slide pile supporting comprehensive construction method, feature exist in back fill course according to claim 1
In: the anchor cable drilling, lashing and slip casting process:
4.1 set up anchor cable drilling platform in back fill course, project anchor cable hole location in slope surface with anchor cable angle positioning device, set up
Drilling machine adjusts bore angle, is drilled into middle weathered rock formation according to design；
4.2 anchor cables are formed using steel strand wires, anchor 6~8m of segment length, anchor cable front end adds guiding cap, is welded and fixed with anchor cable, interior
Packing reality cement mortar, centering bracket and lock ring ring is arranged every the interval 0.4m~0.6m in anchoring section, by Grouting Pipe from anchor cable
The centering bracket in portion passes through, and extends to anchoring section front end；Free section of anchor cable carries out coating butter after preservative treatment, then housing PVC
Bellows, anchor cable are intercepted according to actual borehole depth scene；
4.3 bind after the assay was approved to anchor cable length, straight degree, centering bracket, Grouting Pipe, carry out anchor cable and enter hole, anchor cable presses anchor
Hole inclination angle promotes, smooth when propulsion, if being unable to reach projected depth in progradation, after anchor cable is steadily extracted, weighs
New borehole cleaning, until being installed in place；
After 4.4 anchor cables are installed, borehole cleaning slip casting is carried out immediately, grouting material presses M35 cement mortar mix ratio ingredient, using pressure
Stop grouting plug is arranged in slip casting, the preceding aperture of slip casting, and grouting pressure is 0.5~1Mpa, until fresh slurry is overflowed in slip casting to aperture；Slip casting
A slurries are mended after 30~45 minutes again.
5. pre-stress anti-slide pile supporting comprehensive construction method, feature exist in back fill course according to claim 4
In: anchor cable drills hole location deviation no more than 5mm, and angular deviation is no more than 2 °；Anchor rope grouting slurry uses cement mortar, can mix
Appropriate early strength agent and micro-expanding agent；Preservative treatment is done in anchor cable free end, and passes through soap-free emulsion polymeization PVC bellows.
6. pre-stress anti-slide pile supporting comprehensive construction method, feature exist in back fill course according to claim 1
In: the backfill process: being filled at the 40mm~60mm of anchor cable central axes or less, reserves 8mm~12mm as settling amount, it is desirable that
Coefficient is backfilling and compacted not less than design value.
7. pre-stress anti-slide pile supporting comprehensive construction method, feature exist in back fill course according to claim 1
In: described sleeve pipe is seamless steel pipe, and casing is laid in backfill face, casing central axes and anchor cable central axes same vertical flat
Face, height are higher than anchor cable central axes 10mm, tilt angle with anchor cable tilt angle, protection sleeve pipe be embedded in the soil layer of primary side slope and
It is greater than 100mm in friction pile service sleeve.
8. pre-stress anti-slide pile supporting comprehensive construction method, feature exist in back fill course according to claim 1
In the anchorage cable stretching process: when slip casting slurry and friction pile reach design strength 75% after carry out tensioning, using manual oil
Pump and jack system are loaded, and pre- tensioning is carried out before formal tensioning, 10%~20% design tensile load is taken, to anchor cable
Tensioning 1~2 time, keep its each location contacts close, keep steel strand wires totally straight, uniform force, tensioning should be loaded gently, load speed
Rate is less than 0.1Nk/min.
9. pre-stress anti-slide pile supporting comprehensive construction method, feature exist in back fill course according to claim 8
In 5 applications of: anchorage cable stretching load point, 0.2,0.5,0.75,1.00,1.1 times of design value is successively taken to carry out tensioning step by step, preceding four
Grade holds lotus 5 minutes, and afterbody holds lotus 15 minutes, and every grade of load tensioning answers off-load 10% after holding lotus.
10. pre-stress anti-slide pile supporting comprehensive construction method, feature exist in back fill course according to claim 1
In: the anchor cable mends stretching process: after the completion of backfill, checking anchorage cable anchoring situation by root, carries out anchor cable and mend tensioning；Anchor cable
Detection determines qualification rate using on-site measurement latching force, and for detection method with anchorage cable stretching process, it is design that anchor cable, which detects tensioning value,
1.2~1.4 times of latching force；After detection is qualified, cut after anchorage exposed parts steel strand wires are reserved 50mm using abrasive wheel cutting machine
It removes, to anchor pier brushing antirust paint, finally formwork pours C35 concrete sealing off and covering anchorage again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811209726.0A CN109371987A (en) | 2018-10-17 | 2018-10-17 | Pre-stress anti-slide pile supporting comprehensive construction method in a kind of back fill course |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811209726.0A CN109371987A (en) | 2018-10-17 | 2018-10-17 | Pre-stress anti-slide pile supporting comprehensive construction method in a kind of back fill course |
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| CN109371987A true CN109371987A (en) | 2019-02-22 |
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| CN201811209726.0A Pending CN109371987A (en) | 2018-10-17 | 2018-10-17 | Pre-stress anti-slide pile supporting comprehensive construction method in a kind of back fill course |
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| CN (1) | CN109371987A (en) |
Cited By (4)
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| CN110158497A (en) * | 2019-05-30 | 2019-08-23 | 中铁二院工程集团有限责任公司 | A kind of high cantilever rock-fall protection structure and construction method |
| CN110670605A (en) * | 2019-09-16 | 2020-01-10 | 中冶交通建设集团有限公司 | Mountain road slope reinforcing method |
| CN110761292A (en) * | 2019-09-27 | 2020-02-07 | 中国二十冶集团有限公司 | Prestressed anchor cable structure and prestressed anchor cable construction method |
| CN112195942A (en) * | 2020-09-23 | 2021-01-08 | 贵州建工集团第一建筑工程有限责任公司 | Building foundation slope stepped supporting method |
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| CN110158497A (en) * | 2019-05-30 | 2019-08-23 | 中铁二院工程集团有限责任公司 | A kind of high cantilever rock-fall protection structure and construction method |
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| CN110761292A (en) * | 2019-09-27 | 2020-02-07 | 中国二十冶集团有限公司 | Prestressed anchor cable structure and prestressed anchor cable construction method |
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