CN108797600A - Miniature steel pipe pile prestressed anchor rope combination supporting construction method - Google Patents
Miniature steel pipe pile prestressed anchor rope combination supporting construction method Download PDFInfo
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- CN108797600A CN108797600A CN201810489524.XA CN201810489524A CN108797600A CN 108797600 A CN108797600 A CN 108797600A CN 201810489524 A CN201810489524 A CN 201810489524A CN 108797600 A CN108797600 A CN 108797600A
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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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- 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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- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The present invention relates to construction site Base hole supporting technology fields,Especially miniature steel pipe pile prestressed anchor rope combination supporting construction method,Including Guan Liang is arranged,Steel pipe,Earth excavation,Anchor pole rope and waist rail are set,After earth excavation,Paving hangs steel grid,The jetting cement on waist rail and steel grid,Drain hole and tapping pipe are installed after the completion of spray plane,After anchor pole grouting,Carry out anchorage cable stretching anchoring,With the development of urban construction,A large amount of high levels are emerged around existing building,Often construction site is narrow and proximate building,When excavating, Slope Stability is affected,Proposed place surrounding enviroment are complicated,It is closer away from existing structure,Pipeline is more,When stringent to deformation requirements deep foundation pit support,There are many deficiencies for traditional slope excavation,The present invention is easy for construction,Foundation pit sideline is easy to control,Conducive to shoveling and bursting work,Globality is firm,Effective control slope deforming,Ensure the excavation of deep basal pit and the safety of Adjacent Buildings.
Description
Technical field
The present invention relates to construction site Base hole supporting technology fields, especially miniature steel pipe pile prestressed anchor rope combination branch
Protect construction method.
Background technology
With the development of urban construction, a large amount of high level is emerged around existing building, often construction site is narrow
And proximate building, Slope Stability is affected and proposed place surrounding enviroment are complicated excavating, away from existing structure compared with
Closely, pipeline is more, and when the deep foundation pit support stringent to deformation requirements, traditional slope excavation cannot be satisfied deep foundation pit support
It is required that there are many deficiencies, such as vertical cut local instability, backbreak, explosion, the formation such as catalase and unfavorable structural plane
The danger of adverse slope, supporting and excavation construction difficulty are big, and foundation pit sideline is not easy to control, are unfavorable for shoveling and bursting work, globality
It is poor, and cannot effectively control slope deforming, how under the execution conditions in no slope space, it is ensured that the excavation of deep basal pit and
And the safety of Adjacent Buildings, it has also become the technical barrier in foundation pit support construction.
Invention content
The purpose of the present invention is being directed to many deficiencies existing for traditional pattern foundation pit supporting structure at present, provides miniature steel pipe pile and answer in advance
Power anchor pole rope combination supporting construction method, can effectively solve at no slope space, the support issues of deep basal pit, ensure deep basal pit
And the safety of surrounding building.
In view of the deficienciess of the prior art, miniature steel pipe pile prestressed anchor rope combination supporting construction method of the present invention is wanted
The technical issues of solution, is adopted the technical scheme that:Miniature steel pipe pile prestressed anchor rope combination supporting construction method, including
Following steps：
（One）, miniature steel pipe pile drilling use mesohigh bore process, steel pipe is put into after drilling, after steel pipe is put into, in steel pipe
Portion is inserted into Grouting Pipe, and Grouting Pipe is inserted into bottom hole, then retreats, and starts slip casting, is returned out by steel pipe bottom extravasating hole, slurries from lower and
Upper continuous pouring, until being filled in entire steel pipe and stake holes, Grouting Pipe is at the uniform velocity extracted with the injection of cement mortar, if aperture
Without the slurry that overflows, mend slurry in time, in addition to the infiltration of the also oriented rock-soil layer of the solidification shrinkage of itself, causes aperture to be starched after cement mortar injection
Liquid retraction should use back-grouting technique, and benefit slurry one arrives secondary in time, ensure that aperture slip casting is full；
（Two）, top armored concrete Guan Liang is set, the main reinforcement of miniature steel pipe pile and Guan Liang using being welded to connect, reinforcing bar binding,
After the completion of formwork erection, concrete is poured；
（Three）, after first layer earth excavation, carry out first of anchor pole rope and waist rail construction, it is true according to design requirement before armature boring
Determine hole position, armature boring is taken casing follow-up mode, anchor pole rope should be put into hole immediately after pore-forming, with prestressed anchor
Rope is node, and concrete breast beam is arranged in length and breadth, and waist rail is made of more reinforcing bars, after carrying out reinforcing bar binding, supporting module, with slope surface
Gunite concrete together；
（Four）, a secondary grouting pipe is set among anchor cable bar, prestressed anchor rope free segment uses high pressure polyethylene casing, will
The standoff body of rod of band performed is placed into hole together together with once grouting pipe, and Grouting Pipe is first inserted into bottom hole, then retreats, and opens
Beginning slip casting, slurries from bottom to top with the injection of cement mortar at the uniform velocity extract by continuous pouring, Grouting Pipe, if aperture is mended in time without excessive slurry
Slurry；
（Six）, after the earth excavation of stake face, paving hangs steel grid, between being fixed on anchor pole rope with waist rail, in waist rail and bar-mat reinforcement
Jetting cement on lattice, top of the slope are arranged a casting and follow closely, and bar-mat reinforcement top is arranged reinforcing rib and is connected with soil nailing binding；
（Seven）, drain hole is installed after the completion of spray plane, tapping pipe is set in drain hole；
（Eight）, anchor pole grouting after, carry out anchorage cable stretching anchoring；
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting construction method, steel-pipe pile top enter Guan Liang 0.3m, miniature steel
The deviation proportion of pile pile drilling axis is not more than the 1% of steel pipe pile length, and hole depth is not less than Design of Steel-tube Piles length, but also unsuitable big
In the 200mm of design length, 1 ~ 2min should be stagnated, miniature steel pipe pile drills to projected depth, and blows into hole, will be in hole
Rock powder is blown clean, and after miniature slip casting, before slurry solidifies completely, forbids to collide, rock steel pipe, bolthole finish in drilling and
Aperture is blocked using cement package bags before slip casting, is prevented in sundries and soil bits access aperture.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting construction method, grouting cement are mixed by 0.50 ratio of mud
System, cement mortar should stir evenly, with mixing with the cement mortar once mixed and stirred should be finished before initial set, and prevent that stone, sundries are mixed
Enter.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting construction method, waist rail length 300mm.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting construction method starts suitably reduce injection when injection
Distance makes concrete squeeze into bar-mat reinforcement behind, ensures that bar-mat reinforcement is fully wrapped around by concrete, when spray skin layer concrete, then suitably widens injection
Distance detects surface thickness with bar dowel immediately to 0.6 ~ 1.2 meter after injection, as thickness is unsatisfactory for requiring to spray again again
One time.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting construction method, hole position vertical direction tolerance be ±
50mm, horizontal direction tolerance are ± 30mm, and drill hole inclination tolerance is 3%, bore diameter 130mm, and drilling should be more than
Soil Anchor Design length 0.5m.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting construction method, anchor cable body of rod centering holder use finished product
Plastic stent, every 2.0 meters set one, and free section can uniformly smear one layer of butter or housing plastic bellows hose, and fasten,
Prestressed anchor bar material uses underrelaxation high strength steel strand, and the tensioning of normal intensity 1860MPa, anchor pole should be strong in anchoring body
It can carry out after spending reach design strength with girt strip concrete strength 80%, and by design prestressing force lock value locking, should take
0.1 ~ 0.2 times of axial tension design value Nt keeps the body of rod totally straight the pre- tensioning of anchor cable 1 ~ 2 time, and each location contacts are close；Anchor pole
Tensioning requires timing stage loading to carry out, and manipulates machinery, record and observation data by special messenger when tensioning, and draw anchor pole lotus at any time
A deflection curve figure is carried, for judging that anchor pole quality is used, when prestressed tension rod is not obviously decayed, is pulled to 1.05 ~ 1.1Nt
When, 10min is kept to rock stratum, then off-load to locking load is locked；Prestressed anchor rope strictly presses design length blanking,
Its allowable error is 50mm, and exposed tensioning length is determined according to tensioning equipment, and before body of rod processing, strength test is carried out to material
Sampling observation.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting construction method, soil nailing use the screw-thread steel of diameter 25,
Length and level interval are 1.5 meters, are positioned manually and are driven into.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting construction method, steel grid φ 6.5, single-layer bidirectional,
Length at least 300mm, the intensity C20 of jetting cement, thickness 80mm on waist rail and steel grid spray concrete ratio, cement：In
Sand：Graded broken stone（Grain size is not more than 15mm）=1：2：2.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting construction method, sluicing tube material are the pvc of caliber 50
Pipe, total length 400mm, protruded length 100mm, slope 5% are evenly arranged by the spacing in length and breadth of 2m × 2m in slope surface, in drain hole
Cobble heap capsule drainage layer is arranged in inlet side, is close to not make drainage layer when rock stratum, is wrapped up using strainer on the inside of tapping pipe, and iron wire is tied up
Tightly, it is placed in after tapping pipe and concrete on the outside of pipe is uniformly smeared into reality, leave no gaps.
The advantageous effect of miniature steel pipe pile prestressed anchor rope combination supporting construction method of the present invention be by be arranged Guan Liang,
Steel pipe, earth excavation, before excavation, miniature steel pipe pile of first constructing carries out advance support, it is possible to prevente effectively from backbreak, explosion, rock
Broken and unfavorable structural plane etc. forms the danger of adverse slope, and Slope Stability is advantageous, and anchor pole rope is arranged and waist rail, waist rail pass through reinforcing bar
Tie up, and and concrete layer combination, it is simple in structure, it is easy for construction, after earth excavation, paving hang steel grid,
Jetting cement on waist rail and steel grid, spray plane install drain hole and tapping pipe after the completion, are conducive to water guide and are carried out after anchor pole grouting
Anchorage cable stretching anchors, and anchor pole rope is firm with breast beam structure, effectively controls slope deforming, the present invention is easy for construction, and foundation pit sideline is easy
Control is conducive to cut the earth and bursting work, globality consolidates, effectively controls slope deforming, it is ensured that the excavation and surrounding of deep basal pit
The safety of building.
Specific implementation mode
It elaborates to the present invention with reference to specific embodiment.
Miniature steel pipe pile drilling uses mesohigh bore process, stake diameter to be not less than 150 mm.108mm wall thickness is put into after drilling
5mm seamless steel pipes, spacing 1.0m；After steel pipe is put into, it is inserted into Grouting Pipe in steel duct, Grouting Pipe is inserted into bottom hole, then retreats
300 ~ 500mm starts slip casting, and 0.5 neat slurry of the ratio of mud is perfused, is returned out by steel pipe bottom extravasating hole, slurries connect from bottom to top
Continuous perfusion, until being filled in entire steel pipe and stake holes.Grouting Pipe is at the uniform velocity extracted with the injection of cement mortar, if aperture is without excessive
Slurry mends slurry in time.After cement mortar injection, in addition to the infiltration of the also oriented rock-soil layer of the solidification shrinkage of itself, aperture slurries is caused to return
It contracts, back-grouting technique should be used, benefit slurry one arrives secondary in time, ensures that aperture slip casting is full.
Armored concrete Guan Liang is arranged in top, enters Guan Liang 0.3m at the top of steel-pipe pile.The main reinforcement of miniature steel pipe pile and Guan Liang is adopted
With being welded to connect, after the completion of reinforcing bar binding, formwork erection, C20 concretes are poured.
After first layer earth excavation, first of anchor pole rope and waist rail construction are carried out.It is true according to design requirement before armature boring
Determine hole position, hole position vertical direction tolerance is ± 50mm, and horizontal direction tolerance is ± 30mm, and drill hole inclination allows inclined
Difference is 3%, bore diameter 130mm.Armature boring takes casing follow-up mode, and should anchor pole rope hole be put into immediately after pore-forming
Interior, drilling should be more than Soil Anchor Design length 0.5m.
Prestressed anchor bar material uses 15.2 underrelaxation high strength steel strands of Φ, normal intensity 1860MPa, the anchor cable body of rod pair
Middle holder uses finished plastic holder, and every 2.0 meters set one, and a secondary grouting pipe is arranged among anchor cable bar.Prestressed anchor
Rope free segment uses high pressure polyethylene casing, so that the body of rod is isolated with cement mortar, it is ensured that this section of Free Transform of the body of rod.The band that will be performed
The standoff body of rod is placed into hole together together with once grouting pipe, and Grouting Pipe is first inserted into bottom hole, then retreats 300 ~ 500mm,
Start slip casting, slurries continuous pouring from bottom to top, and ensures out of hole smoothly draining, gas.Grouting Pipe is even with the injection of cement mortar
Speed is extracted, if slurry without excessive slurry, is mended in aperture in time, prestressed anchor rope strictly presses design length blanking, allowable error 50mm,
Its exposed tensioning length is determined according to tensioning equipment.
Using prestressed anchor rope as node, 300mm waist rails are set in length and breadth, breast beam structure is made of more reinforcing bars, carries out steel
After muscle binding, supporting module, C20 concrete is sprayed together with slope surface.
Top of the slope is arranged a casting and follows closely, and bar-mat reinforcement top is arranged reinforcing rib and is connected with soil nailing binding.Soil nailing uses HRB400 diameters
25 screw-thread steel, length and level interval are 1.5 meters.It is positioned manually and is driven into, ensure its length before constructing and be driven into angle
Meet design requirement.
Paving hangs 6.5@200mm single-layer bidirectionals of steel grid φ, between being fixed on anchor pole rope with waist rail, the lap of splice between mesh sheet
At least 300mm.Jetting cement, concrete strength C20, thickness 80mm.Spray concrete ratio, cement：Middle sand：Graded broken stone（Grain size is little
In 15mm）=1：2：2, after the earth excavation of stake face, linked network simultaneously carries out concrete spray concrete, and spray concrete thickness is not less than 80mm.
Drain hole is installed, material is that the pvc of caliber 50 is managed, total length 400mm, protruded length 100mm, tiltedly after the completion of spray plane
Rate 5% is evenly arranged by the spacing in length and breadth of 2m × 2m in slope surface.In drain hole inlet side, cobble heap capsule drainage layer is set,（Tightly
Do not make drainage layer when pasting rock stratum）, use dank material.It is wrapped up using strainer on the inside of water pipe, iron wire tightens, after being placed in tapping pipe
Concrete on the outside of pipe is uniformly smeared into reality, is left no gaps.
After soil bolt grouting, when anchoring body and waist rail concrete strength reach the 80% of design strength, you can carry out prestressing force
Tensioning；0.1 ~ 0.2 times of axial tension design value Nt should be taken to the pre- tensioning of anchor cable 1 ~ 2 time, keep the body of rod totally straight, each location contacts
Closely；Anchor pole tensioning requires timing stage loading to carry out, and manipulates machinery, record and observation data by special messenger when tensioning, and at any time
One deflection curve figure of anchor pole load is drawn, for judging that anchor pole quality is used.When prestressed tension rod is not obviously decayed, it is pulled to
When 1.05 ~ 1.1Nt, 10min is kept to rock stratum, then off-load to locking load is locked.
The materials such as cement, sand, stone, steel and concrete ratio are taken out according to the rules by specific supervision engineer witness sampling
Sample presentation is examined, laboratory there must be corresponding qualification.
This bracing engineering cutting depth, area are larger, therefore remove and carry out safe and reliable retaining design design, strictly press
Code requirement construction is outer, should still carry out field monitoring, accomplish information-aided construction.Monitoring content：Horizontal displacement monitoring, prestressed anchor
The monitoring of bar axle power, underground water are observation, close on ground, the observation of building, pipe settlement.
In the construction process, it is noted that the deviation proportion of miniature steel pipe pile drilling axis is no more than steel pipe pile length
1%.Hole depth is not less than Design of Steel-tube Piles length, but is not also preferably greater than the 200mm of design length.
Miniature steel pipe pile drills to projected depth, should stagnate 1 ~ 2min, and blow into hole, and rock powder in hole is dried up
Only.Drilling blocks aperture before finishing slip casting, prevents in sundries and soil bits access aperture, bottom hole sediment is not more than 200mm.
After miniature slip casting, before slurry solidifies completely, forbids to collide, rocks steel pipe.
Bolthole finishes in drilling and blocks aperture using cement package bags before slip casting, prevents sundries and soil bits access aperture
It is interior.
Grouting P.O42.5 cement, by 0.50 ratio of mud mixing.Cement mortar should stir evenly, with mixing with once mixing
The cement mortar of sum should be finished before initial set, and prevent that stone, sundries are mixed into.
Slope surface is cleared up：Earthwork evacuation finishes and behind thick pingbian slope, should use manual amendment slope surface, exclude surface dust or danger
Stone reduces the rebound degree of concrete, the purpose of the smooth beauty of face layer to reach the bond strength of enhancing concrete face layer and side slope.
Start suitably reduce jet length when injection, concrete is made to squeeze into bar-mat reinforcement behind, ensures that bar-mat reinforcement is wrapped completely by concrete
It wraps up in, when spray skin layer concrete, then suitably widens jet length to 0.6 ~ 1.2 meter, keep concrete jetting thickness uniform, surfacing.
Surface thickness is detected with bar dowel immediately after injection, as thickness is unsatisfactory for requiring spraying one time again again.
Free section can uniformly smear one layer of butter or housing plastic bellows hose, and fasten.
The tensioning of anchor pole should anchoring body intensity and waist rail concrete strength reach design strength 80% after can be into
Row, and by design prestressing force lock value locking.Before body of rod processing, strength test sampling observation is carried out to material, ensures the tension of the body of rod
Power.
Bolt cement uses P.O42.5 cement, the ratio of mud 0.40~0.5, bolt grouting to use secondary grouting technique.
In construction, process record is performed per procedure, it is stringent to check and accept, not by inspection, next process must not be entered.Anchor
Bar construction size and tolerance see the table below
All construction personnel are before being on duty, it is necessary to carry out post education, learn act of technique for security and rules and regulations, safety is anti-
Protect performance and the application of facility, personal protective equipment use and keeping etc., can be on duty operation after examination is qualified.
Twice flak jacket railing is set with Ф 48mm steel pipes around away from foundation pit side 0.6m, upright bar spacing 2m is higher by naturally
Level ground 1.2m, buried depth 0.8m.
Forbid mound, windrow within the scope of foundation pit upper brim 1m and parks equipment.It mustn't within the scope of bolt-spary supports 5m suitable for reading
Loaded vehicle stops.
In Excavation Process, bucket is forbidden to collide supporting construction（Waist rail, anchor pole rope, concrete mask etc.）, excavate tight in place
Taboo is backbreak.
Warning sign is set during foundation pit construction, night adds red colored lamp mark.
Adopt an effective measure control construction in airborne dust, bagged cement must cover, must not random air storage, Yi Mianyu
Leaching.
Personnel into site operation must put on work clothes, safe wearing cap, gloves, goggles, etc. labour protections use
Product.
When opening work position, it is necessary to which closing electrical switching is simultaneously cut off the power.When using electric tool, unsuitable band gloves.
Certainly, above description is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the those of ordinary skill in domain is made in the essential scope of the present invention, should also belong to this hair
Bright protection domain.
Claims (10)
1. miniature steel pipe pile prestressed anchor rope combination supporting construction method, which is characterized in that include the following steps：
（One）, miniature steel pipe pile drilling use mesohigh bore process, steel pipe is put into after drilling, after steel pipe is put into, in steel pipe
Portion is inserted into Grouting Pipe, and Grouting Pipe is inserted into bottom hole, then retreats, and starts slip casting, is returned out by steel pipe bottom extravasating hole, slurries from lower and
Upper continuous pouring, until being filled in entire steel pipe and stake holes, Grouting Pipe is at the uniform velocity extracted with the injection of cement mortar, if aperture
Without the slurry that overflows, mend slurry in time, in addition to the infiltration of the also oriented rock-soil layer of the solidification shrinkage of itself, causes aperture to be starched after cement mortar injection
Liquid retraction should use back-grouting technique, and benefit slurry one arrives secondary in time, ensure that aperture slip casting is full；
（Two）, top armored concrete Guan Liang is set, the main reinforcement of miniature steel pipe pile and Guan Liang using being welded to connect, reinforcing bar binding,
After the completion of formwork erection, concrete is poured；
（Three）, after first layer earth excavation, carry out first of anchor pole rope and waist rail construction, it is true according to design requirement before armature boring
Determine hole position, armature boring is taken casing follow-up mode, anchor pole rope should be put into hole immediately after pore-forming, with prestressed anchor
Rope is node, and concrete breast beam is arranged in length and breadth, and waist rail is made of more reinforcing bars, after carrying out reinforcing bar binding, supporting module, with slope surface
Gunite concrete together；
（Four）, a secondary grouting pipe is set among anchor cable bar, prestressed anchor rope free segment uses high pressure polyethylene casing, will
The standoff body of rod of band performed is placed into hole together together with once grouting pipe, and Grouting Pipe is first inserted into bottom hole, then retreats, and opens
Beginning slip casting, slurries from bottom to top with the injection of cement mortar at the uniform velocity extract by continuous pouring, Grouting Pipe, if aperture is mended in time without excessive slurry
Slurry；
（Six）, after the earth excavation of stake face, paving hangs steel grid, between being fixed on anchor pole rope with waist rail, in waist rail and bar-mat reinforcement
Jetting cement on lattice, top of the slope are arranged a casting and follow closely, and bar-mat reinforcement top is arranged reinforcing rib and is connected with soil nailing binding；
（Seven）, drain hole is installed after the completion of spray plane, tapping pipe is set in drain hole；
（Eight）, anchor pole grouting after, carry out anchorage cable stretching anchoring.
2. miniature steel pipe pile prestressed anchor rope combination supporting construction method according to claim 1, characterized in that steel pipe
Stake top portion enters Guan Liang 0.3m, and the deviation proportion of miniature steel pipe pile drilling axis is not more than the 1% of steel pipe pile length, and hole depth is not less than steel
Pipe pile design length, but it is not also preferably greater than the 200mm of design length, 1 ~ 2min should be stagnated, miniature steel pipe pile drills deep to design
It after degree, and blows into hole, rock powder in hole is blown clean, after miniature slip casting, before slurry solidifies completely, forbid to collide, shake
Steel pipe is shaken, bolthole finishes in drilling and blocks aperture using cement package bags before slip casting, prevents in sundries and soil bits access aperture.
3. miniature steel pipe pile prestressed anchor rope combination supporting construction method according to claim 1, characterized in that slip casting
With cement, by 0.50 ratio of mud mixing, cement mortar should stir evenly, with mixing with the cement mortar once mixed and stirred should be in initial set
Before be finished, and prevent that stone, sundries are mixed into.
4. miniature steel pipe pile prestressed anchor rope combination supporting construction method according to claim 1, characterized in that waist rail
Length 300mm.
5. miniature steel pipe pile prestressed anchor rope combination supporting construction method according to claim 1, characterized in that start
Jet length should be suitably reduced when injection, concrete is made to squeeze into bar-mat reinforcement behind, ensured that bar-mat reinforcement is fully wrapped around by concrete, worked as spray skin layer
When concrete, then jet length is suitably widened to 0.6 ~ 1.2 meter, surface thickness, such as thickness are detected with bar dowel immediately after injection
It is unsatisfactory for requiring spraying one time again again.
6. miniature steel pipe pile prestressed anchor rope combination supporting construction method according to claim 1, characterized in that Kong Wei
Vertical direction tolerance is ± 50mm, and horizontal direction tolerance is ± 30mm, and drill hole inclination tolerance is 3%, drilling
Diameter 130mm, drilling should be more than Soil Anchor Design length 0.5m.
7. miniature steel pipe pile prestressed anchor rope combination supporting construction method according to claim 1, characterized in that anchor cable
Body of rod centering holder uses finished plastic holder, and every 2.0 meters set one, and free section can uniformly smear one layer of butter or housing
Plastic bellows hose, and fasten, prestressed anchor bar material uses underrelaxation high strength steel strand, normal intensity 1860MPa, anchor pole
Tensioning should anchoring body intensity reach with girt strip concrete strength design strength 80% after can carry out, and by design
Prestressing force lock value locks, and 0.1 ~ 0.2 times of axial tension design value Nt should be taken to the pre- tensioning of anchor cable 1 ~ 2 time, keep the body of rod completely flat
Directly, each location contacts are close；Anchor pole tensioning requires timing stage loading to carry out, and manipulates machinery, record by special messenger when tensioning and sees
Measured data, and one deflection curve figure of anchor pole load is drawn at any time, for judging that anchor pole quality is used, when prestressed tension rod is not bright
When aobvious decaying, when being pulled to 1.05 ~ 1.1Nt, 10min is kept to rock stratum, then off-load to locking load is locked, prestressed anchor
Bar rope strictly presses design length blanking, allowable error 50mm, and exposed tensioning length determines that the body of rod adds according to tensioning equipment
Before work, strength test sampling observation is carried out to material.
8. miniature steel pipe pile prestressed anchor rope combination supporting construction method according to claim 1, characterized in that soil nailing
Using the screw-thread steel of diameter 25, length and level interval are 1.5 meters, are positioned manually and are driven into.
9. miniature steel pipe pile prestressed anchor rope combination supporting construction method according to claim 1, characterized in that reinforcing bar
Grid φ 6.5, single-layer bidirectional, length at least 300mm, the intensity C20 of jetting cement, thickness 80mm on waist rail and steel grid,
Spray concrete ratio, cement：Middle sand：Graded broken stone（Grain size is not more than 15mm）=1：2：2.
10. miniature steel pipe pile prestressed anchor rope combination supporting construction method according to claim 1, characterized in that let out
Supplying pipe is that the pvc of caliber 50 is managed, and total length 400mm, protruded length 100mm, slope 5% exist by the spacing in length and breadth of 2m × 2m
Slope surface is evenly arranged, and cobble heap capsule drainage layer is arranged in drain hole inlet side, is close to not make drainage layer when rock stratum, in tapping pipe
Side is wrapped up using strainer, and iron wire tightens, and is placed in after tapping pipe concrete on the outside of pipe uniformly smearing reality, leave no gaps.
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| CN109518699A (en) * | 2019-01-23 | 2019-03-26 | 广州地铁集团有限公司 | Miniature steel pipe pile adds grid spray anchor deep foundation ditch combination supporting scheme system and its construction method |
| CN109811771A (en) * | 2019-01-16 | 2019-05-28 | 北京建材地质工程有限公司 | Make the simple and easy method not bent when anchor bar steel waist rail tensioning |
| CN110004927A (en) * | 2019-03-27 | 2019-07-12 | 招商局重庆交通科研设计院有限公司 | Prestressing force miniature pile construction 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 |
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| CN113216202A (en) * | 2021-04-20 | 2021-08-06 | 中铁第一勘察设计院集团有限公司 | Small-sized steel pipe concrete pile supporting system and construction method thereof |
| CN114934518A (en) * | 2022-05-23 | 2022-08-23 | 甘肃建投建设有限公司 | Deep foundation pit reinforcing method combining reverse pile, pressure reduction and grouting |
| CN114934518B (en) * | 2022-05-23 | 2024-04-26 | 甘肃建投建设有限公司 | Deep foundation pit reinforcement method combining reverse pile, decompression and grouting |
| CN115012426A (en) * | 2022-06-13 | 2022-09-06 | 山东建材勘察测绘研究院有限公司 | Steel pipe pile support and construction method for existing telegraph pole during four-cycle full excavation |
| CN115012426B (en) * | 2022-06-13 | 2024-02-13 | 山东建材勘察测绘研究院有限公司 | Steel pipe pile support and construction method for existing telegraph pole during four-week full excavation |
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