CN106498943B - Disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method - Google Patents
Disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method Download PDFInfo
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- CN106498943B CN106498943B CN201510566428.7A CN201510566428A CN106498943B CN 106498943 B CN106498943 B CN 106498943B CN 201510566428 A CN201510566428 A CN 201510566428A CN 106498943 B CN106498943 B CN 106498943B
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Abstract
The present invention provides a kind of disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method, comprising: anchor pole hole measurement identification of steps；Construction operation platform builds step；Drilling machine installation steps；Prestressed anchor production and installation steps；Drill process；Rotary jet grouting step；Anchored end enlarged footing construction procedure；Purlin and anchor plate installation steps；Anchor rod prestress tensioning and construction procedure.The present invention embodies extremely good anchor force and anti-pulling capacity compared to conventional slip casting prestressed anchor construction by the application practice in the irregular deep-foundation pit engineering of multiple super larges, disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method.Anchor rod ultimate anti-pulling capacity can be significantly increased in the present invention, reduce the cost of anchor pole case unit capacity.
Description
Technical field
The present invention relates to slip casting type Prestressed Soil anchor pole construction technology, in particular to a kind of disposable high-pressure rotary-spray type expands
Head Prestressed Soil anchor pole construction method.
Background technique
Utilization is continually developed with urban underground space, deep-foundation pit engineering becomes increasingly prevalent, and especially super large is super
The appearance of deep irregular foundation pit engineering brings great test to our design and construction.
For irregular deep basal pit, the application limitation of armored concrete or steel shotcrete support system is a lot of, and ground
Bolt support technology energy flexible Application, is not influenced, rock soil anchor (rope) technology will be from now on thus by foundation pit shape and depth
It will obtain and rapidly develop, prestressed anchor (rope) support system will be used widely in building foundation pit building enclosure.Anchor
Bar (below including rope) technology is influenced by the complexity of geological conditions, the intensity of building enclosure, overall stability and deformation
Larger, the height of anchoring quality depends entirely on the interaction force of bolt anchorage mechanism, anchoring system and the soil body.Practice of construction
In the process, conventional slip casting type Prestressed Soil anchor pole construction method estimates effect since anchoring section slip casting weight is not achieved, and gives work
Hidden danger has been buried in journey construction, or even directly brings risk accidents.In addition, conventional slip casting type Prestressed Soil anchor pole construction method is only
Suitable for soil layers such as bury, silt, cohesive soil, sands；Anchor pole anti-pulling capacity often can only achieve design stretching force
80%~100%；Cementation power with the soil body is not strong enough with the threshold friction resistance of the soil body；Enlarged footing construction effect is unknown
Aobvious, by secondary grouting, anchoring section counter bore diameter is only capable of 1.2 times up to drill bit (plate) diameter；Need first pore-forming that anchor pole is installed again
Muscle and slip casting, therefore anchor pole case unit capacity cost is higher.Therefore discussion how to improve the cohesive force of soil layer and anchoring section injecting cement paste at
Crucial technical problem.
Summary of the invention
The embodiment of the invention provides a kind of disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction methods, with solution
Effect certainly is estimated since anchoring section slip casting weight is not achieved in the prior art, has buried hidden danger to engineering construction, or even directly
The problem of bringing risk accidents.
To achieve the goals above, the embodiment of the invention provides a kind of disposable high-pressure rotary-spray type enlarged footing Prestressed Soils
Anchor rod construction method, comprising:
Anchor pole hole measurement identification of steps: according to the hole location coordinate that construction control points and construction drawing are given, total station is utilized
Accurate measuring bolthole hole location, and drilling position is numbered and is indicated；
Construction operation platform builds step: utilizing steel pipe scaffold, according to anchor hole unwrapping wire position, builds the anchor of setting width
Bar job platform, wherein scaffold board is laid on the superficial layer of the anchor pole job platform, the basis of the anchor pole job platform is used
The steel pipe anchoring pile of vertical level is fixed；
Drilling machine installation steps: the installation of the drill bit, impactor and drilling rod of drilling machine is carried out；Borer chassis is adjusted by drill bit
It is directed at hole location；Chassis or the drilling rod that drilling machine is measured using inclinometer, are adjusted the inclination angle of drilling rod, position and carry out erection assembling；Benefit
Drilling machine is fixed on the anchor pole job platform with connector；
Prestressed anchor production and installation steps: steel strand anchoring section and anchorage cable design length are marked according to design drawing
Position sets up centering positioning annulus by setting spacing, end socket plate is fixed in the end of anchorage cable anchoring section；Anchor cable is buckled into brill
In the end socket plate of head whirl spraying pipe slip casting end, and it is guiding with it, follows the whirl spraying pipe and drilling rod to be inserted between two parties anchor cable
In anchor hole, when anchor cable and rotary jet grouting to when designing nose end bottom absolute altitude, the whirl spraying pipe of slip casting is reversely revolved and is moved back, slip casting is made
The whirl spraying pipe is detached from end socket plate and anchor cable；
Drill process: repeatedly aperture is crept into back and forth using the drill bit when booting drilling, the inclination angle of correcting aperture
And hole location, drilling machine is adjusted at any time, adjusts the technological parameter of drilling machine according to the soft or hard character of soil layer in drilling；
Rotary jet grouting step: the aperture of anchor pole is used using clay or cement slurry as sealer with assembled, and water is first sent into
Mud is sent into compressed air afterwards, and after spraying the first set period of time when anchoring section is in rotation, rotation, drilling and injection are simultaneously
It carries out；
Anchored end enlarged footing construction procedure: after drilling rod rotary drilling and simultaneously high-pressure mortar spraying to projected depth, rotation is improved
The pressure of preventing slurry injection extends rotary jet grouting not less than setting minimum critical pressure, and according to the size of enlarged footing length and diameter
Second setting time, while slowing down the angular velocity of rotation of drilling rod, the grouting amount of unit length is expanded twice or more；
Purlin and anchor plate installation steps: when excavation of foundation pit is to anchor pole hole site following set distance (50cm), according to
Set anchor pole position, marks the purlin position line, then construction concrete purlin or installation steel corbel and steel purlin；Then, pre-
The assembling that anchor plate combined member is completed in field processed, combined member is fixed in purlin, and anchor cable is worn from combined member
Out, anchor cable is compressed using anchorage and anchor plate；
Anchor rod prestress tensioning and construction procedure: before anchor rod prestress tensioning, first carrying out pre- tensioning to injecting cement paste, pre- to open
Drawing load is 0.1 times for designing tensile load；Each beam anchor cable simultaneous tension in anchor pole, the tension stress point Pyatyi of anchor cable are applied
Add, every grade of stable time third set period of time；When anchorage cable stretching to final value, stablizes the 4th set period of time, then unload
It is locked to locking design load.
In one embodiment, it is set up with installation steps by the spacing of 100~150cm in prestressed anchor production
Centering positions annulus.
In one embodiment, between prestressed anchor production and fulcrum when in installation steps, controlling anchor cable carrying
Away from≤2m, turning radius >=10m.
In one embodiment, it in the rotary jet grouting step, is sent into compressed air and is carried out within 10 seconds after being sent into cement slurry.
In one embodiment, before the rotary jet grouting step, compressed air pressure, cement paste pressure and stream are adjusted
Amount reaches predetermined value.
In one embodiment, the minimum critical pressure is 25MPa.
In one embodiment, the first set period of time is 1 minute.
In one embodiment, second set period of time is 3 to 6 minutes.
In one embodiment, the third set period of time is 2 to 5 minutes.
In one embodiment, the third set period of time is 10 to 15 minutes.
Beneficial effect of the embodiment of the present invention is:
Disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method of the invention is applied widely, can apply
In system of deep foundation pit support, can also be applied in the engineerings such as soil slope reinforcement.By in the irregular deep basal pit work of multiple super larges
Application practice in journey, disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction is compared to conventional slip casting prestressing force
Anchor bolt construction engineering method, embodies extremely good anchor force and anti-pulling capacity, Social benefit and economic benefit are significant.
Anchor rod ultimate anti-pulling capacity can be significantly increased in the present invention, reduce the cost of anchor pole case unit capacity.Such as
Two are needed with the prestressed anchor of diameter using conventional slip casting, then uses prestressed anchor of the invention (or slightly long) instead only
It needs together, or horizontal space can be expanded with the prestressed anchor of diameter using people having a common goal's number of this engineering method or shorten length.Comprehensive ratio
Compared with 30% or more anchor bolt works cost can be saved using invention method.
The present invention carries out slip casting anchoring using high-pressure rotary-spray machinery and disposably completes anchor pole using the special tectonic of drill bit
Construction, work efficiency greatly improve；A large amount of manual operations are needed to carry out two compared to conventional construction prestressed cable engineering method (slip casting anchoring)
Secondary steel strand wires are sent into, and a large amount of labour's consumption has been saved.
The present invention uses high pressure jet grouting anchorage style, directly using double Grouting Pipe composite injection high pressure water mud and
Two kinds of media of compressed air are stirred fusion while cutting the soil body and are reached hardening, reaming using slurries as injection stream
(slip casting anchoring body) diameter can achieve 0.5m or so, in addition the effect of anchored end enlarged footing, with conventional construction prestressed cable
Engineering method realizes that anchoring body reaming (diameter 25cm) is compared by secondary injection slurry processes, substantially increases prestressed anchor bearing capacity,
Eliminate the process expense of back-grouting.
Disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method be by the way of high pressure jet grouting into
Two kinds of media of high pressure water mud and compressed air are passed through double slip casting using high-pressure injection pump by the anchoring construction of row anchoring section
Pipe or single drilling rod Grouting Pipe, high speed is horizontal around sprays into the soil body, and fusion, and glue are stirred while cutting the soil body
Knot hardening, counter bore diameter can achieve 0.5m or so, form the anchor bolt grouting body of uniform high strength, with conventional construction prestressed cable
Engineering method is compared, and anchoring body intensity can be enhanced, and increase substantially prestressed anchor carrying plus the effect of anchored end enlarged footing
Power, it is ensured that security of foundation ditch construction is reliable.
The present invention introduces end socket plate in prestress anchorage cable manufacturing process, in anchor cable end, compares only in anchor cable
End introduces the conventional construction engineering method of guiding cap, and invention increases anchor cable ends to bear face in anchoring body, makes anchor cable
Fixed end restraining force improves, to greatly enhance the ultimate bearing capacity of prestress anchorage cable.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the prestress anchor device of the embodiment of the present invention；
Fig. 2 is the disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method flow chart of the embodiment of the present invention；
Fig. 3 is the disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction construction technology of another embodiment of the present invention
Flow chart.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to solve the problems, such as that injecting cement paste is of poor quality in the prior art, soil layer is low with the cohesive force of anchoring section injecting cement paste, this
Inventive embodiments provide a kind of disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method.First below from anchoring
Body and soil body cohesive force, enlarged footing, drilling well, the stability of the excavation slope soil body, enlarged footing Prestressed Soil anchor pole cost performance are excellent
Property etc., introduce disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole Construction Principle:
1, high pressure jet grouting improves the principle of anchoring body and soil body cohesive force
Disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction is infused using high pressure (being not less than 20MPa) whirl spraying
Pulp grinder reason cuts soil layer by the impact force of fluid, at the same time since drilling rod rotation whitewashing stirs the soil body sufficiently with cement slurry
Mixing is mixed, anchoring body induration is reached.Since the pressure of high pressure jet grouting is big, the scattering and permeating ability of slurries is also big, and
The effect of whirl spraying is more uniform, since pore-forming and placement anchor cable and rotary jet grouting are disposably completed, therefore the knot of anchoring body and soil layer
Conjunction face is not only without separation layer, and slurries can penetrate into the soil layer of anchoring body surrounding, to improve anchoring body and the soil body
Adhesion strength, the limit frictional resistance of anchor bar body and soil layer is improved compared with conventional grouted anchor bar.
2, high pressure jet grouting reaming increases anchoring body diameter into enlarged footing principle
High-pressure rotary-spray type Prestressed Soil anchor pole in drilling machine pore-forming and is disposably placed in anchor cable, while carrying out high-pressure rotary-spray note
The techniques such as slurry construction, i.e. pore-forming, placement anchor cable, rotary jet grouting are disposably completed, and work efficiency greatly improves.
Since the pressure of rotary jet grouting is big, therefore in addition to the diameter of anchoring body can be on the basis at drill (plate) diameter
On, reaming is up to the 2 times or more of drill bit (plate) diameter (anchoring body diameter up to 300~400mm), and can be in anchored end in the soil body
Using increase spray pressure and again the spray measure cutting soil body replace to be formed cylindrical enlarged footing (enlarged footing diameter up to 500~
600mm), to increase the contact area of anchoring body and the soil body, i.e., than routine with the grouted anchor bar of diameter improve anchor pole with
The limit frictional resistance of the soil body；The technological measure of anchored end enlarged footing specifically includes that the pressure for increasing rotary jet grouting is not less than
25MPa, the time for extending rotary jet grouting, the angular speed for slowing down drilling rod rotation and linear velocity of drilling etc..
3, special drill bit technological principle
Drill configurations of the invention are special, except the mouth spray of drilling rod inner core tube connection drill bit two sides is as high pressure jet grouting
Outside channel, drill bit also has connection sleeve (stator), uses two-bearing jointed rod core pipe in sleeve, makes drilling rod core pipe rotary drilling
Into when keep connection sleeve do not turn, end socket plate and the anchor cable of connection make the preceding close of sleeve under soil cement wedge action in addition
Seal and end socket plate and its anchor cable of connection will not be twisted into twist shape in rotary drilling.The front and back sealing rings of sleeve play
Seal protection bearing is not acted on by mud contamination, and after completing rotary jet grouting, drilling rod and drill bit are after-teeminged on one side rotatably exit while
Slurry, the anchor cable of end socket plate and its anchoring is then stayed in grouted anchor bar, to ensure that bit drilling and forming hole and installation anchor
Rope and high pressure jet grouting are disposably completed.
Drilling rod, connects sleeve, drill bit, and end socket plate and at least two anchor cable steel strand wires together constitute prestressed anchor dress
It sets.As shown in Figure 1, the embodiment of the present invention provides a kind of prestress anchor device, which includes: drilling rod 101,
Connect sleeve 102, drill bit 103, end socket plate 104 and at least two anchor cable steel strand wires 105.
Connection sleeve 102 is connected to 101 lower end of drilling rod, and the inside of connection sleeve 102 passes through two-bearing jointed rod 101
Core pipe.
Drill bit 103 is connected to the lower end of connection sleeve 102, and the side of drill bit 103 is equipped with mouth spray 106, and end is connected with
Drill bit 107.
End socket plate 104 is set on drill bit 103, positioned at the top of mouth spray 105, is arranged close to connection sleeve 102.
One end of anchor cable steel strand wires 105 passes through end socket plate 104, and is equipped with steel at the end after end socket plate 104
Twisted wire anchor head 108.
In one embodiment, connection sleeve 102 is equipped with front baffle sealing ring and rear bulkhead sealing ring, can prevent brill
It is contaminated that bar connects sleeve.
Since the inside of connection sleeve 102 passes through the core pipe of two-bearing jointed rod 101, the core pipe rotation of drilling rod 102
When drilling, connection sleeve 102 is used as stator, and holding does not turn, and end socket plate 104 and the anchor cable steel strand wires 105 of connection are in water in addition
It under soil wedge action, revolve the preceding sealing ring for connecting sleeve 102 and end socket plate and its anchor cable steel strand wires of connection will not
Turn to be twisted into twist shape when drilling.
During above structure based on prestress anchor device, drilling rod and bit after-teeming slurry, it is not necessarily to end socket disk
Plate and its anchor cable steel strand wires of anchoring remove grouted anchor bar, can disposably complete high pressure jet grouting, improve slip casting efficiency.
When it is implemented, drilling rod 102 is fixed in rack 110 by rotary motive power head 109, the needs of rack 110 are fixed on
On borer chassis 111.
In addition, prestress anchor device also needs to be connected with for cooling cooling system, it is connected with hydraulic oil container and drive
The motor of dynamic rod boring.
4, the stability principle of the prestressed anchor enhancing excavation slope soil body
The free segment of certain length is often provided in prestressed anchor, the soil body passes through anchor rod anchored section of anchor force
Free segment is transmitted on the waist rail and support pile of foundation pit supporting construction, realizes the force balance under native water lateral pressure effect.Due to
Prestressed effect makes the soil structures between foundation pit supporting pile and anchor rod anchored end in closely knit compressive state, keeps hole side soil
The globality of body.Simultaneously as the prestressing force effect of anchor pole, changes the stress state of the slip fracture face soil body, to guarantee
The stabilizing power of excavation pit side slope.
5, the excellent principle of disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole cost performance
Characteristic due to disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole with above-mentioned introduction, therefore the pole of the anchor pole
It is big to limit anti-pulling capacity, i.e. the low cost of case unit capacity.Such as pattern foundation pit supporting structure uses conventional slip casting with the prestressed anchor of diameter
Bar needs two, and using prestressed anchor of the invention (or slightly long) instead only needs together；Or it is same using people having a common goal's number of the invention
The prestressed anchor of diameter can expand horizontal space or shorten length.In short, not only reducing cost using the present invention, and conveniently
Construction, accelerates the duration, to generate preferable economic benefit and social benefit.
As shown in Figures 2 and 3, the disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction party of the embodiment of the present invention
Method includes:
S201: anchor pole hole measurement identification of steps: according to the hole location coordinate that construction control points and construction drawing are given, using complete
The accurate measuring bolthole hole location of instrument of standing, and drilling position is numbered and is indicated.
S201 is preparative work before construction step, before construction, first has to find out the clay distribution of scene of operations and each
The physico mechanical characteristic and foundation pit surrounding environment situation and WATER LEVEL CHANGES situation of soil layer are anchor bolt construction machinery and drilling
And the selection of rotary jet grouting technique provides foundation.Then according to report of engineering geological exploration and Foundation Pit Support Design drawing, establishment
Special construction plan.Hole location coordinate finally given according to control point and construction drawing, goes out anchor using with the accurate measuring of total station
Rod aperture hole location, and drilling position is numbered and is indicated, carry out the protection to hole location.
S202: construction operation platform builds step: utilizing steel pipe scaffold, according to anchor hole unwrapping wire position, it is wide to build setting
The anchor pole job platform of degree, wherein scaffold board is laid on the superficial layer of the anchor pole job platform, the anchor pole job platform
The steel pipe anchoring pile of basis vertical level is fixed.
When it is implemented, levelling of the land degree, earth bearing strength requirement need to be detected for the place for meeting operation side requirement,
Ineligible need to carrying out to ground is smooth, and compacting makes to reach foundation bearing force request (foundation bearing capacity >=80KPa).It must
Steel plate is spread when wanting, and increases foundation bearing capacity.To the scene of no operation side, erection construction job platform, routine work are needed
Platform is as follows:
1,2m wide anchor pole job platform is built by anchor hole unwrapping wire position using steel pipe scaffold.
2, flat surface should be lower than horizontally-arranged anchor hole 0.5m or so, and platform surface layer upper berth scaffold board, set up defences guard rail rod on foundation pit side
3, the steel pipe anchoring pile anchor jail of platform base vertical level, guarantees stability when drilling machine construction.
S203: drilling machine installation steps: the installation of the drill bit, impactor and drilling rod of drilling machine is carried out；Adjust borer chassis
Drill bit is directed at hole location；Chassis or the drilling rod that drilling machine is measured using inclinometer, are adjusted the inclination angle of drilling rod, position and carry out erection group
Dress；Drilling machine is fixed on the anchor pole job platform using connector.
S204: prestressed anchor production and installation steps: steel strand anchoring section is marked according to design drawing and is set with anchor cable
Extension position is counted, centering positioning annulus is set up by setting spacing, end socket plate is fixed in the end of anchorage cable anchoring section；By anchor cable
It buckles into the end socket plate of drill bit whirl spraying pipe slip casting end, and is guiding with it, follow the whirl spraying pipe and drilling rod to occupy anchor cable
In middle insertion anchor hole, when anchor cable and rotary jet grouting to when designing nose end bottom absolute altitude, the whirl spraying pipe of slip casting is reversely revolved and is moved back, is made
The whirl spraying pipe of slip casting is detached from end socket plate and anchor cable.
Bore process influence anchor pole bearing capacity, construction efficiency and cost, it depend primarily on site foundation soil property and
Drilling machine, therefore before S204, need to carry out the selection of bore process, common bore process method is as follows:
1, it disposably completes anchor pole operational method: being suitable for general soft soil foundation, rich groundwater region should first reduce water
Position；Determine drilling rod rotation and penetration rate and the parameters such as high-pressure rotary-spray pressure and Mortar mix proportion.
2, helical-shaped bit, which drills, does working system: when anchor cable is in level of ground water or more, in non-Riddled Condition and there are rocks
Body or block stone Shi Shiyong.
Major part of the anchor pole as prestress anchor device, S204 when it is implemented, include following anchor pole production and
Rockbolt installation step.
1, anchor pole making step
Anchor pole is made using high strength steel strand, and rust staining, greasy dirt should be removed before production.Anchor cable cutting length is anchor cable
Design length, anchor head height, jack length, the summation of the thickness of moveable anchor and tension operation surplus.Under normal circumstances, steel
Twisted wire needs the operation surplus being truncated that can take 50mm, and according to design drawing, it is long with anchorage cable design to mark steel strand anchoring section
Spend position；Centering positioning annulus is set up by 100~150cm spacing, to keep anchor cable resultant force position and anchor pole body axis basic one
It causes, and guarantees that every steel strand wires are straight, do not turn round, do not pitch, arrangement is uniform；Finally, mechanically being fixed in the end of anchorage cable anchoring section
In end socket plate (carrier head), answer fixed.In one embodiment, centering setting circle can be set up by the spacing of 100~150cm
Ring.
2 anchor cable installation steps
It controls fulcrum spacing≤2m, turning radius >=10m when anchor cable is carried and generates torsional deformation when anchor cable being avoided to carry；
Anchor cable is buckled into the end socket plate of drill bit whirl spraying pipe slip casting end, and is guiding with it, anchor cable is followed into whirl spraying pipe and is bored
Bar is inserted into anchor hole between two parties；To anchor cable and rotary jet grouting to design nose end bottom absolute altitude, as long as slightly the whirl spraying pipe of slip casting is reversely revolved
It moves back, the whirl spraying pipe i.e. drilling rod of slip casting can be made to be detached from end socket plate and anchor cable.In addition, lower anchor cable needs human assistance to guarantee anchor cable
Straight placed in the middle.
S205: drill process: back and forth repeatedly creeping into aperture using the drill bit when booting drilling, correcting aperture
Inclination angle and hole location, adjust drilling machine at any time, adjust the technological parameter of drilling machine according to the soft or hard character of soil layer in drilling.
When it is implemented, S205 includes: dip angle of hole rate-determining steps and drilling process rate-determining steps.
1, dip angle of hole rate-determining steps
Booting drilling Shi Yaoyong drill bit back and forth repeatedly creeps into aperture, the inclination angle of correcting aperture and hole location, and is opening
When just 1m is crept into hole, chassis or the drilling rod of drilling machine are measured with inclinometer, adjusts drilling machine at any time, not because stratum is soft or hard when guaranteeing aperture
Or slope surface out-of-flatness causes the hole location deviation of drilling machine, every drilling 3~5m inclinometer measures and adjusts drilling hole deviation in drilling,
Guarantee pore-forming in a straight line, and is not more than the 3% of rock-bolt length at the deviation proportion of axially bored line.The steel triangle of customization can also be used
The inclination angle of ruler rapid measuring drilling rod.
2, drilling process rate-determining steps
The various process parameters of drilling machine should be adjusted according to the soft or hard character of soil layer in drilling.When ground character is harder
It answers the low pressure slow-speed of revolution to creep into, the high revolving speed drilling of high pressure is answered when ground character is softer.Higher pressure is applied when drilling deeper,
The pressure of whirl spraying can be suitably reduced when drilling more shallow.To ensure hole depth, actual borehole depth should be greater than projected depth
50cm。
S206: rotary jet grouting step: the aperture of anchor pole is used using clay or cement slurry as sealer with assembled, is first sent
Enter cement slurry, is sent into compressed air afterwards, after spraying the first set period of time when anchoring section is in rotation, rotation, drilling and injection
It carries out simultaneously.
S206 is high pressure jet grouting, and main construction techniques parameter is as follows:
Slurries are prepared using 42.5 grades of ordinary portland cements, cement mixed weight is generally no less than 250kg/m, clay powder
50kg/m, the slurries ratio of mud are 0.6~1.0, and early strength agent triethanolamine volume is about the 1 ‰ of cement weight；Grouting Pipe, that is, drilling rod
Into or exit (general soil layer) 0.2~0.5m/min of speed, rotation speed is 20~25r/min；Well sprays pressure is not small
In 20MPa, 80~90L/min of grouting amount；When anchor pole bearing capacity is larger, air compressor machine is preferably configured, compressed air pressure 0.7Mpa,
1~2m3/min of capacity.
The slurries of slip casting should stir evenly, with stirring with and being finished before initial set；The continuous rotary jet grouting of slurries guarantees single
Root anchor pole continuous grouting finishes.The aperture of anchor pole can use clay or cement slurry sealer with assembled.First be sent into cement slurry, after give
Enter compressed air.Under normal circumstances, compressed air can be sent 10 seconds in evening.After spraying 1 minute when anchoring section is in rotation, then carry out side
Rotation is sprayed in drilling.Compressed air pressure, cement paste pressure and flow should be adjusted before whirl spraying reaches predetermined value.
It should be noted that during prestressed anchor anchoring section rotary jet grouting, notably check the slurries presetting period,
The state modulators such as grouting amount, pressure, rotation speed and record are complete, to grasp pile quality.Bridging type is answered after drilling rod spreading
20cm is sprayed again.If timely shutdown inspection is repaired facility and is managed it was found that should ascertain the reason in time when grouting pressure is too high or too low
Road；If should pull up drilling rod (Grouting Pipe) cleaning immediately it was found that spray head blocks, again when down tube whirl spraying, need the overlap joint of whirl spraying 20cm
Length, to prevent the disconnected slurry of anchoring section or leakiness.Whitewashing terminates in time to screw out whirl spraying pipe (drilling rod) and supplements whitewashing, finally
Cleaning, is used in turn with benefit.Every 30 anchor poles of the test block of slurry intensity inspection should not be less than one group, and every group should not be less than 6
Test block.
S207: it anchored end enlarged footing construction procedure: after drilling rod rotary drilling and simultaneously high-pressure mortar spraying to projected depth, mentions
The pressure of high rotary jet grouting extends whirl spraying not less than setting minimum critical pressure, and according to the size of enlarged footing length and diameter
The second setting time of slip casting, while slowing down the angular velocity of rotation of drilling rod, the grouting amount of unit length is expanded twice or more.
It in one embodiment, should be in drilling rod rotary drilling and high-pressure mortar spraying arrives simultaneously when design has anchored end enlarged footing
After projected depth (enlarged footing top mark is high), the pressure of rotary jet grouting is improved not less than 25MPa, and according to enlarged footing length and diameter
Size extend about 3~6 minutes time when setting (second) left and right of rotary jet grouting, while slowing down the rotation of drilling rod (whirl spraying pipe)
Angular speed, i.e. angular velocity of rotation are not more than 20r/min, expand the grouting amount of unit length at twice or more.Anchored end enlarged footing
Forming whether meet design requirement, should be by the rule of existing professional standard " building foundation pit supporting technical regulation " JGJ120 appendix A
Surely anti-pulling capacity test is carried out, anti-pulling capacity detected value should meet the requirement of the sector standard and design.
S208: purlin and anchor plate installation steps: when excavation of foundation pit is to anchor pole hole site following set distance (50cm),
According to set anchor pole position, the purlin position line is marked, then construction concrete purlin or installation steel corbel and steel purlin；Then,
The assembling that anchor plate combined member is completed in precasting yard, combined member is fixed in purlin, and by anchor cable from combined member
In be pierced by, anchor cable is compressed using anchorage and anchor plate.It should be noted that the bearing plate welded with purlin and backing plate should be vertical
In anchor cable axis.
S209: anchor rod prestress tensioning and construction procedure: before anchor rod prestress tensioning, first injecting cement paste is opened in advance
It draws, pre- tensile load is 0.1 times for designing tensile load；Each beam anchor cable simultaneous tension in anchor pole, the tension stress point of anchor cable
Pyatyi applies, every grade of stable time third set period of time；When anchorage cable stretching to final value, stablize the 4th set period of time, so
After be offloaded to locking design load locked.
When it is implemented, after injecting cement paste (soil cement) intensity and concrete actuating system reach the 75% of design strength,
It can carry out anchorage cable stretching construction.1~2 pre- tensioning first is carried out to injecting cement paste before formal tensioning, pre- tensile load is design
0.1 times for drawing load, keeps cable body totally straight, each location contacts are close, are conducive to slow down steel strand wires stress in stretching process
Inhomogeneities；It needs to be adjusted with ball seat, clapboard when small bias occurs for anchor head.
Each beam anchor cable in anchor pole answers simultaneous tension, and the tension stress point Pyatyi of anchor cable applies, respectively design stretching force
25%, 50%, 75%, 100%, 110%, every grade of 2~5min of stable time；Rate of loading at different levels are not preferably greater than 0.1Nk/
Min, and preceding level Four rate of loading is not more than 50KN/min, afterbody is not more than 25KN/min, i.e. afterbody tensioning is held
The lotus time should be grown.Nk is the axle power value of the standard load combination of anchor pole in formula.
When anchorage cable stretching to final value, stablize 10~15min, is then offloaded to locking design load and is locked.If
Find that loss of prestress is more than 10%, should carry out benefit tensioning after anchor cable locking in 48 hours.
After S209, it is also necessary to carry out sealing off and covering anchorage and anchor head protective treatment and anchor pole and steel wale recycling step.
In sealing off and covering anchorage and anchor head protective treatment step, after anchor rod prestress tensioning or compensation tensioning, hole-sealing grouting is carried out immediately:
Grouting Pipe is inserted into from preformed hole, until nozzle enters anchoring section top surface about 50cm.Air in hole is fixed via orifice closing is located at
Exhaust pipe discharge at the slurry stop of position.After hole-sealing grouting, the extra steel strand wires of machine cuts forbid electricity to cut, oxyacetylene metal-cutting, and anchor head steel twists
Line is outer remaining >=and 10cm protects with anti-slip, then with the concrete covering anchor head not less than 5cm thickness.
In anchor pole and steel wale recycling step, hypogee structure and change anchor pole measure construction after the completion of, start by low
It is supreme to remove recycling steel wale by road.Before removing per pass waist rail, it should construct and change anchor pole measure, i.e., be wanted by foundation pit enclosure design
It asks, fills out pool slag or sandstone in foundation pit surrounding rammer, or in hypogee floor and gone along with sb. to guard him between piling wall with concrete short beam top jail.Benefit
Fall the outer anchor head backing plate on steel wale with electric welding gas flame cuttiug, unloads steel wale.When prestressed anchor surmounts property line
When needing to pull out, it should carry out pulling out steel strand wires using pipe type bearing head and before steel wale disassembly at anchor rod anchored end.It pulls out
When steel strand wires, the intermediate plate of two steel strand wires of the first same carrier head of removal is inserted in feed-through hydraulic thousand to exposed longer one section
Jin top, and apply pulling force, while one end of the root steel strand wires is drawn out, the steel strand wires of the other end are drawn into anchor cable hole, and thousand
Jin top applies pulling force with keeping multiple-pass, until whole steel strand wires are drawn out outside hole around carrier head.
Disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method of the invention is applied widely, can apply
In system of deep foundation pit support, can also be applied in the engineerings such as soil slope reinforcement.By in the irregular deep basal pit work of multiple super larges
Application practice in journey, disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction is compared to conventional slip casting prestressing force
Anchor bolt construction engineering method, embodies extremely good anchor force and anti-pulling capacity, Social benefit and economic benefit are significant.
Anchor rod ultimate anti-pulling capacity can be significantly increased in the present invention, reduce the cost of anchor pole case unit capacity.Such as
Two are needed with the prestressed anchor of diameter using conventional slip casting, then uses the prestressed anchor (or slightly long) of this engineering method instead only
It needs together, or horizontal space can be expanded with the prestressed anchor of diameter using people having a common goal's number of this engineering method or shorten length.Comprehensive ratio
Compared with can save 30% or more anchor bolt works cost, be shown in Table 1 using this engineering method.
1 present invention of table and conventional grouted anchor bar process economics contrast table
The present invention carries out slip casting anchoring using high-pressure rotary-spray machinery and disposably completes anchor pole using the special tectonic of drill bit
Construction, work efficiency greatly improve；A large amount of manual operations are needed to carry out two compared to conventional construction prestressed cable engineering method (slip casting anchoring)
Secondary steel strand wires are sent into, and a large amount of labour's consumption has been saved.
The present invention uses high pressure jet grouting anchorage style, directly using double Grouting Pipe composite injection high pressure water mud and
Two kinds of media of compressed air are stirred fusion while cutting the soil body and are reached hardening, reaming using slurries as injection stream
(slip casting anchoring body) diameter can achieve 0.5m or so, in addition the effect of anchored end enlarged footing, with conventional construction prestressed cable
Engineering method realizes that anchoring body reaming (diameter 25cm) is compared by secondary injection slurry processes, substantially increases prestressed anchor bearing capacity,
Eliminate the process expense of back-grouting.
Disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method be by the way of high pressure jet grouting into
Two kinds of media of high pressure water mud and compressed air are passed through double slip casting using high-pressure injection pump by the anchoring construction of row anchoring section
Pipe or single drilling rod Grouting Pipe, high speed is horizontal around sprays into the soil body, and fusion, and glue are stirred while cutting the soil body
Knot hardening, counter bore diameter can achieve 0.5m or so, form the anchor bolt grouting body of uniform high strength, with conventional construction prestressed cable
Engineering method is compared, and anchoring body intensity can be enhanced, and increase substantially prestressed anchor carrying plus the effect of anchored end enlarged footing
Power, it is ensured that security of foundation ditch construction is reliable.
The present invention introduces end socket plate in prestress anchorage cable manufacturing process, in anchor cable end, compares only in anchor cable
End introduces the conventional construction engineering method of guiding cap, this engineering method increases anchor cable end and bears face in anchoring body, makes anchor cable
Fixed end restraining force improves, to greatly enhance the ultimate bearing capacity of prestress anchorage cable.
Specific embodiment is applied in the present invention, and principle and implementation of the present invention are described, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (11)
1. a kind of disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method characterized by comprising
Anchor pole hole measurement identification of steps: according to the bolthole hole location coordinate that construction control points and construction drawing are given, whole station is utilized
The accurate measuring bolthole hole location of instrument, and bolthole hole location is numbered and is indicated；
Anchor pole job platform builds step: utilizing steel pipe scaffold, according to bolthole unwrapping wire position, builds the anchor pole of setting width
Job platform, wherein scaffold board, the anchor pole job platform vertical water are laid on the superficial layer of the anchor pole job platform
The steel pipe anchoring pile of plane is fixed；
Drilling machine installation steps: the installation of the drill bit, impactor and drilling rod of drilling machine is carried out；Drill bit is aligned by adjustment borer chassis
Bolthole hole location；Chassis or the drilling rod that drilling machine is measured using inclinometer, are adjusted the inclination angle of drilling rod, position and carry out erection assembling；
Drilling machine is fixed on the anchor pole job platform using connector；
Prestressed anchor production and installation steps: anchor cable steel strand anchoring section and anchorage cable design length are marked according to design drawing
Position sets up centering positioning annulus by setting spacing, end socket plate is fixed in the end of anchor cable steel strand anchoring section,
Wherein, prestressed anchor includes: drilling rod, connection sleeve, drill bit, end socket plate and at least two anchor cable steel strand wires, connection
Sleeve connection passes through the core pipe of two-bearing jointed rod in drilling rod lower end, the inside for connecting sleeve, and drill bit is connected to connector sleeve
The side of the lower end of cylinder, drill bit is equipped with mouth spray, and end is connected with drill bit, and end socket plate is set on drill bit, is located at whitewashing
The top of mouth, close to connection sleeve setting, one end of anchor cable steel strand wires passes through end socket plate, and at this after end socket plate
End is equipped with anchor cable stranded wire anchor head；
Drill process: repeatedly aperture is crept into back and forth using the drill bit when booting drilling, the inclination angle of correcting aperture and anchor
Rod aperture hole location, adjusts drilling machine at any time, adjusts the technological parameter of drilling machine according to the soft or hard character of soil layer in drilling；
Rotary jet grouting step: cement slurry, as sealing device, is first sent into using clay or cement slurry in the aperture of bolthole, rear to be sent into
Compressed air, after spraying the first set period of time when anchoring section is in rotation, rotation creeps into and sprays while carrying out,
Wherein, in the end socket plate that anchor cable is fixed on to drill bit whirl spraying pipe slip casting end, and it is guiding with it, anchor cable is followed
The whirl spraying pipe and drilling rod are inserted into bolthole between two parties, when anchor cable and rotary jet grouting are to design bottom hole absolute altitude, by the institute of slip casting
State whirl spraying pipe and reversely revolve and move back, the whirl spraying pipe of slip casting is made to be detached from end socket plate and anchor cable, and end socket plate and anchor cable then stay in
In bolthole；
Anchored end enlarged footing construction procedure: after drilling rod rotary drilling and simultaneously high-pressure mortar spraying to projected depth, whirl spraying note is improved
The pressure of slurry extends rotary jet grouting second not less than setting minimum critical pressure, and according to the size of enlarged footing length and diameter
Set period of time, while slowing down the angular velocity of rotation of drilling rod, the grouting amount of unit length is expanded twice or more；
Purlin and anchor plate combined member installation steps: when excavation of foundation pit set distance following to anchor pole hole site, according to both
Determine bolthole hole location, mark the purlin position line, then construction concrete purlin or installation steel corbel and steel purlin；Then, exist
The assembling that anchor plate combined member is completed in precasting yard, anchor plate combined member is fixed in purlin, and by anchor cable from anchor pad
It is pierced by plate combined member, is compressed anchor cable using anchorage and anchor plate combined member；
Anchor rod prestress tensioning and construction procedure: before anchor rod prestress tensioning, pre- tensioning, pre- tensioning lotus first are carried out to injecting cement paste
Carry is 0.1 times of design tensile load；Each beam anchor cable simultaneous tension in anchor pole, the tension stress point Pyatyi of anchor cable apply, often
Grade stablizes the time as third set period of time；When anchorage cable stretching to final value, stablize the 4th set period of time, is then offloaded to lock
Constant load design value is locked.
2. disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method according to claim 1, feature exist
In, the prestressed anchor production with installation steps in, by the spacing of 100~150cm set up centering positioning annulus.
3. disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method according to claim 1, feature exist
In, the prestressed anchor production with installation steps in, control anchor cable carry when fulcrum spacing≤2m, turning radius >=
10m。
4. disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method according to claim 1, feature exist
In in the rotary jet grouting step, feeding compressed air carries out for 10 seconds after being sent into cement slurry.
5. disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method according to claim 1, feature exist
In before the rotary jet grouting step, adjusting compressed air pressure, cement paste pressure and cement grout flow reach predetermined
Numerical value.
6. disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method according to claim 1, feature exist
In the minimum critical pressure is 25MPa.
7. disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method according to claim 1, feature exist
In the first set period of time is 1 minute.
8. disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method according to claim 1, feature exist
In second set period of time is 3 to 6 minutes.
9. disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method according to claim 1, feature exist
In the third set period of time is 2 to 5 minutes.
10. disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method according to claim 1, feature exist
In the 4th set period of time is 10 to 15 minutes.
11. disposable high-pressure rotary-spray type enlarged footing Prestressed Soil anchor pole construction method according to claim 1, feature exist
In the set distance is 50cm.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106759325A (en) * | 2017-03-20 | 2017-05-31 | 北京中岩大地科技股份有限公司 | A kind of many enlarged footing jet grouting anchor rod rod devices of cloth-bag type and its construction method |
| CN107142934A (en) * | 2017-07-17 | 2017-09-08 | 化学工业岩土工程有限公司 | A kind of expanding enlarged footing anchor bolt support |
| CN107190755A (en) * | 2017-07-19 | 2017-09-22 | 上海宝冶集团有限公司 | Disposable high-pressure rotary-spray reinforced cement-soil pile anchor support construction |
| CN108343056A (en) * | 2018-02-08 | 2018-07-31 | 北京方圆恒基岩土工程技术有限公司 | Reinforced cement-soil anchor bolt |
| CN110258579A (en) * | 2019-06-06 | 2019-09-20 | 深圳市工勘岩土集团有限公司 | Synchronous mode construction prestressed cable method |
| CN110847168B (en) * | 2019-12-12 | 2024-06-25 | 长安大学 | Drilling, anchoring and grouting combined construction device and anchor cable construction method |
| CN111945717B (en) * | 2020-06-27 | 2022-02-15 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Slope in-service anchor cable bearing capacity detection device and detection method |
| CN112049122A (en) * | 2020-08-31 | 2020-12-08 | 常州第一建筑集团有限公司 | One-step forming construction method for deep foundation pit soft soil slope high-pressure rotary spraying prestressed anchor cable |
| CN114808727A (en) * | 2022-05-12 | 2022-07-29 | 湖南联智智能科技有限公司 | Automatic control method for prestress multi-stroke tensioning |
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Effective date of registration: 20200910 Address after: Building 1, 5500 Yuanjiang Road, Minhang District, Shanghai, 201111 Patentee after: Hongrun Construction Group Shanghai Co., Ltd Address before: 200235 Shanghai City Cao Xuhui District Long Road 200 Lane 28 Hongrun building 11 floor Patentee before: HONGRUN CONSTRUCTION GROUP Co.,Ltd. |