CN110295592A - A kind of Construction of High Pressure Jet Grouting Pile method applied to green engineering foundation stabilization - Google Patents
A kind of Construction of High Pressure Jet Grouting Pile method applied to green engineering foundation stabilization Download PDFInfo
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- CN110295592A CN110295592A CN201910556211.6A CN201910556211A CN110295592A CN 110295592 A CN110295592 A CN 110295592A CN 201910556211 A CN201910556211 A CN 201910556211A CN 110295592 A CN110295592 A CN 110295592A
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- construction
- pile
- high pressure
- jet grouting
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Classifications
-
- 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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
-
- 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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
Abstract
The present invention provides a kind of Construction of High Pressure Jet Grouting Pile method applied to green engineering foundation stabilization, which comprises the following steps: A. preparation of construction;B. it constructs measuring;C. grouting process;The grouting process includes: whirl spraying, multiple spray, control cement consumption, grout processing, the shape control of induration, guarantees that stake top intensity, anti-string hole, pile quality are examined;D. quality controls.The present invention will not impact neighboring buildings structure in actual utilization.The vibration of construction, noise are smaller, will not interfere to nearby residents, in addition in work progress, will not generate a large amount of pollution goods and materials, environmental benefit is good, is the construction technology of green.
Description
Technical field
The invention belongs to green construction technology ranges, and in particular to a kind of high pressure rotation applied to green engineering foundation stabilization
Spray pile construction method.
Background technique
High-pressure rotary jet grouting pile is with its economical and practical performance, the design method of simple and flexible, and does not generate substantially in construction
The advantages that environmental pollution, is more and more widely used in engineering.
High Pressure Jet Grouting Pile Composite Foundation be mixed with high pressure cement slurries with foundation soil consolidation formed a kind of soil it is compound
Material, be stake and soil collective effect, the intensity of subsoil soil had not only been utilized but also has been allowed to strengthen, have reinforcing ground with
Waterproof stops the effect seeped, and is suitable for processing mud, muck soil, cohesive soil, silt, loess, sand, artificial earth fill and rubble
The grounds such as soil, it has the advantages that, and its construction technology is simple, short time limit, small investment, strong applicability.
After the Grouting Pipe with special nozzle is drilled into the predetermined position of soil layer using drilling machine, pumped with high-voltage pulse, by water
Slurry liquid passes through the injection apparatus of drilling rod lower end, sprays into the soil body around with high speed is horizontal.Due to drilling rod with certain speed gradually
It is lifted up and rotates, slurries, which are formed after high pressure sprays, has very big kinetic energy, high speed, the injection stream of high pressure is generated, by height
Pressure injection stream can largely replace Soft Soil Layer and compacted soil around pile, sand-gravel cushion or clay and cement slurry can be allowed to be sufficiently mixed, glue
Knot, hardening, are consolidated into an entirety.In this way, the cement earth pile with higher-strength can be formed in ground, reach conditioned soil
Matter, the purpose for increasing foundation strength, reducing soil body compressive deformation, improve the bearing capacity of ground.
But current Construction of High Pressure Jet Grouting Pile method standardizes not enough, also not fully achieved the requirement of green construction, still
It needs to improve.
Summary of the invention
In view of this, the present invention provides a kind of high-pressure rotary jet grouting pile applied to green engineering foundation stabilization of specification procedure
Construction method, the present invention will not impact neighboring buildings structure in actual utilization.The vibration of construction, noise are smaller,
Nearby residents will not be interfered, in addition in work progress, a large amount of pollution goods and materials will not be generated, environmental benefit is good, is green
The construction technology of color.
The technical solution of the present invention is as follows:
A kind of Construction of High Pressure Jet Grouting Pile method applied to green engineering foundation stabilization, which comprises the following steps:
A. preparation of construction;
B. it constructs measuring;
C. grouting process;
The grouting process includes: whirl spraying, multiple spray, control cement consumption, grout processing, the shape control of induration, guarantees stake
Push up intensity, anti-string hole, pile quality inspection;
D. quality controls.
Further, the method for the preparation of construction includes following aspect:
It A1. is according to carrying out site clearing and smooth with the actual conditions at scene;
A2. it combines design requirement and the relevant technologies to provide, carries out technology and safety is told somebody what one's real intentions are and security civilization education;
A3. it according to owner and supervisor's requirement, determines that suitable position first carries out test pile, is determined by test pile necessary
Technical parameter, such as the type of nozzle, drilling depth, promote speed, whirl spraying pressure and flow, the slurries ratio of mud, stake diameter and stake intensity;
A4. the work in every before drawing joint examination is carried out;
A5. it is closely connected and cooperates with supervisor with construction unit;
A6. water flowing energization and place are hardened;
A7. necessary living facilities are set up;
A8. mechanical equipment real-world operation situation is checked;
A9. the specific location of cement laydown platform etc. is determined according to horizontal layout situation.
Further, the method for the construction measuring includes following aspect:
B1. start setting-out using the method for polygon control survey according to the control point that construction unit proposes with steel ruler and theodolite, put
Sample precision should reach claimed below: error is no more than ± 10S in angle, and error is no more than ± 5mm in distance;
B2. according to on-site actual situations, the control point on main shaft is moved to the place not being destroyed, while takes measures to be subject to
Effective protection;
B3. after axis being reviewed confirmation qualification, start the measurement of stake site, it is desirable that its precision reaches ± 30mm or more;
B4. the Site visa-an important chain for carrying out measurement review, guarantees the accuracy and integrality of correlation technique data.
Further, the method for the whirl spraying specifically: be carried out continuously by sequence from top to bottom, if sent out in construction
Raw machine halt trouble, should be after maintenance process be good, and downward overlap joint handles at least 500mm, and it is good whole to guarantee that induration has with this
Property.In view of subsoil geology is complex, soil layer constantly changes within the scope of entire depth, grogs composition, compactness and
Water content has very big difference, if constructed using a kind of parameter, the diameter of induration can be made to cannot keep uniformly, most
Bearing capacity is adversely affected eventually.In this regard, different measure should be taken to carry out slip casting, especially argillic horizon and hard different soil
Soil layer should suitably slow down the speed of rotation and promotion, can also properly increase pressure when whirl spraying.
Further, in the multiple pressure spray process, on keeping rotary spray technique parameter basis, weight is carried out in identical soil layer
Multiple slip casting can guarantee that slip casting destroys length and plays the role of increasing pile body diameter, guarantee concretion body strength in this way.Multiple
All whitewashings during spray, as multiple spray number is increasing, concretion body strength increases effect and obviously improves.
Further, in the control cement consumption technique, when whitewashing is promoted, it is necessary to strictly be controlled to cement consumption
System, the pressure, the diameter of nozzle used when its main and ratio of mud, whitewashing are related with the promotion several factors of speed, can be used with
Lower method is controlled: (1) when cement amount has it is remaining when, properly increase pressure when whitewashing, increase the diameter of nozzle or subtract
Slowly the speed promoted;(2) when cement amount deficiency, grouting pressure is reduced under the premise of guaranteeing that stake diameter meets the requirements, and reduces spray
The diameter of mouth accelerates to be promoted on the basis of guaranteeing pile body integral strength, can also increase the ratio of mud of mud.
Comprehensively consider this engineering practice, each stake is divided into multiple stirring, and dosage accurately controls, true in strict accordance with design
Fixed ratio of mud slurrying, carrying out appropriate adjustment to the above parameter can ensure that cement amount meets design requirement;When cement slurry occur compared with
When big sinking, multiple spray appropriate should be carried out, so as to improve pile body top integral strength.
Further, the method for the grout processing specifically:
It is more than 20% when leakage amount is in slip casting total amount, should be immediately treated after ascertaining the reason;When flow remains unchanged but pressure
When rapid drawdown, needs inspection to be confirmed whether there is leakage, Grouting Pipe is taken out if necessary, examines whether it seals;When grout does not connect
Continuous or not consecutive hours, passes through suitably multiple spray processing;When check discovery around there are secret tunnel and cavity when, no longer in slip casting
Conduit is promoted, continues slip casting until starting grout, can also directly extract conduit, after grout cures in hole, then tripping in
Conduit continues slip casting.Accelerator preparation rapid hardening slurries can be added in the case of necessary;On the basis of guaranteeing that whitewashing amount is constant
Improve the pressure of whirl spraying;Guarantee the size for reducing nozzle on the basis of whirl spraying pressure is constant;Increase the speed for being promoted and being rotated.
Further, in the shape control technique of the induration, the tune to whirl spraying pressure and practical grouting amount can be passed through
Whole to control induration forming shape, this engineering consolidation shape is a cylinder, should carry out while being promoted in construction
Rotate slip casting.To guarantee that deep layer Forming Quality should increase the pressure of whitewashing when whitewashing to bottom, carry out repeating whitewashing.
Further, in the guarantee stake top severity process, during implementing injection using cement grout, because slurries have
There is certain bleed, so can shrink, the top of induration generates pit when this understands, and depth will receive slurry used
The influence of the factors such as liquid, induration diameter and hole depth.For this phenomenon, effective measures should be formulated and handled, such as superelevation
Whirl spraying and bleeding recharge.
Further, the method in the anti-string hole specifically:
In construction, unit should take jump to beat mode;When implementing whirl spraying to high compression soil layer, the pressure of whirl spraying should be reduced;Accelerate
Rotation and the speed promoted.
Further, the method that the pile quality is examined specifically:
After completing high-pressure rotary-spray construction, test to pile quality, inspection project includes:
(1) transverse and longitudinal stake position: deviation extracts total amount of pile 10% and tests no more than 50mm, while each inspection batch
Quantity should reach 5 or more, and the method for inspection is to be measured using theodolite and steel ruler;
(2) pile body verticality: deviation extracts total amount of pile 10% and tests no more than 1%, while each number for examining batch
Amount should reach 5 or more, examine and carried out using theodolite;
(3) stake diameter: being not less than design requirement, extracts total amount of pile 10% and tests, while each quantity for examining batch should reach
To 5 or more, after cutting depth reaches 50-100cm, directly measured using steel ruler.
The method of quality control includes:
D1. construction must be carried out in strict accordance with design parameter and code requirement, according to test result, in conjunction with the geological conditions at scene
With mechanical equipment situation, drill hole of drilling machine is first carried out, then bored grouting;In construction, the promotion rate of drilling rod presses 20cm/min
Control, the speed of rotation are controlled by 20r/min, and the pressure of pump machine is controlled in 35MPa;When not obtaining the approval of technical staff,
Technological parameter can not be changed without authorization;
D2. projected depth refers to the geological conditions confirmed through geotechnical boring, and the brill for reaching supporting course needs is deep;In mortar depositing construction
In, needing length in reserve is the pile crown of 50cm or so, avoid slurries shrink the intensity and absolute altitude of stake top are caused it is unfavorable
It influences;
D3. during jet groutinl, guarantee the continuity and uniformity promoted, no matter because which kind of reason stops injection, all
At least overlap joint of 500mm was carried out before restoring injection, pile body is avoided to disconnect, generate burning into sand and folder mud phenomenon;
D4. when high-pressure injection, if pressure abrupt change, is significantly increased leakage amount, or does not have grout, will stop being injected into
Row checks, after determining producing cause, processing of adopting an effective measure;
D5. in view of rotary churning pile integral strength is relatively low, so should be carried out using artificial when being excavated to pile crown, can not make
It is excavated with mechanical equipment cruelty, influences the globality of pile body, pile body is damaged;
D6. unusable large-scale weight during pile crown is abolished, in order to avoid by stake top lower part pile damage.
The technology of the present invention has extensive boundary of works area, is applicable to: a variety of solid reinforcements.In conjunction with Construction of High Pressure Jet Grouting Pile
Technical characterstic, available its can reach good consolidation effect, sandy soil, cohesive soil, collapsible loess to a variety of grounds
Deng ideal consolidation effect can be obtained;It can be used for diaphram wall, foundation stabilization and antiseepage, the tunnel reinforcement etc. of building
Construction in, and consolidation effect is significant;Narrow space situation.For place relative narrowness, and spatial altitude is lower, such case
It can complete to reinforce, the daily life function of engineering will not be interfered during reinforcing, effect is obvious.
High-pressure rotary jet grouting pile is one of common foundation consolidating technology measure, to guarantee jet grouting pile construction quality, reaches ideal
Consolidation effect, the present invention all carried out from Construction in Preparatory Stage to quality inspecton phase Construction control work, pay close attention to each and apply
The main points of work, elimination is all may be to the factor that whirl spraying quality impacts.
The invention has the following advantages:
1, easy for construction, it is applied widely.The Construction of High Pressure Jet Grouting Pile technology scope of application with higher, in actual reinforcing
In, it is not influenced by geological conditions, not by the interference of existing building.
2, pile body shaped position is flexible.It, need to be to stake for the primary demand for catering to engineering in practical construction technology application
Specification is shown in control.
3, injection direction diversification.Construction Technology of Jet Grouting Piles is selected, injection direction can be artificially controlled, it is achievable to vertical
Directly, the injection of all directions such as oblique, horizontal, and complete reinforcement.
4, durability is preferable, and working security is high.In specific Construction of High Pressure Jet Grouting Pile technology, high pressure water is mainly selected
The safety coefficient of the equipment such as pump, high mudjack, these equipment is high, it is not easy to induce construction safety hidden danger.
5, good environmental benefit.Construction of High Pressure Jet Grouting Pile technology provided by the invention, in actual utilization, to periphery
Building structure will not impact.The vibration of construction, noise are smaller, will not interfere to nearby residents, in addition work progress
In, a large amount of pollution goods and materials will not be generated, environmental benefit is good, is the construction technology of green.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, below in conjunction with specific embodiment, to this
Invention is described in further detail.It should be understood that the specific embodiments described herein are only to explain this hair
It is bright, and the scope of protection of the present invention is not limited.
Embodiment 1
A kind of Construction of High Pressure Jet Grouting Pile method applied to green engineering foundation stabilization, which comprises the following steps:
A. preparation of construction;
B. it constructs measuring;
C. grouting process;
The grouting process includes: whirl spraying, multiple spray, control cement consumption, grout processing, the shape control of induration, guarantees stake
Push up intensity, anti-string hole, pile quality inspection;
D. quality controls.
Further, the method for the preparation of construction includes following aspect:
It A1. is according to carrying out site clearing and smooth with the actual conditions at scene;
A2. it combines design requirement and the relevant technologies to provide, carries out technology and safety is told somebody what one's real intentions are and security civilization education;
A3. it according to owner and supervisor's requirement, determines that suitable position first carries out test pile, is determined by test pile necessary
Technical parameter, such as the type of nozzle, drilling depth, promote speed, whirl spraying pressure and flow, the slurries ratio of mud, stake diameter and stake intensity;
A4. the work in every before drawing joint examination is carried out;
A5. it is closely connected and cooperates with supervisor with construction unit;
A6. water flowing energization and place are hardened;
A7. necessary living facilities are set up;
A8. mechanical equipment real-world operation situation is checked;
A9. the specific location of cement laydown platform etc. is determined according to horizontal layout situation.
Further, the method for the construction measuring includes following aspect:
B1. start setting-out using the method for polygon control survey according to the control point that construction unit proposes with steel ruler and theodolite, put
Sample precision should reach claimed below: error is no more than ± 10S in angle, and error is no more than ± 5mm in distance;
B2. according to on-site actual situations, the control point on main shaft is moved to the place not being destroyed, while takes measures to be subject to
Effective protection;
B3. after axis being reviewed confirmation qualification, start the measurement of stake site, it is desirable that its precision reaches ± 30mm or more;
B4. the Site visa-an important chain for carrying out measurement review, guarantees the accuracy and integrality of correlation technique data.
Further, the method for the whirl spraying specifically: be carried out continuously by sequence from top to bottom, if sent out in construction
Raw machine halt trouble, should be after maintenance process be good, and downward overlap joint handles at least 500mm, and it is good whole to guarantee that induration has with this
Property.In view of subsoil geology is complex, soil layer constantly changes within the scope of entire depth, grogs composition, compactness and
Water content has very big difference, if constructed using a kind of parameter, the diameter of induration can be made to cannot keep uniformly, most
Bearing capacity is adversely affected eventually.In this regard, different measure should be taken to carry out slip casting, especially argillic horizon and hard different soil
Soil layer should suitably slow down the speed of rotation and promotion, can also properly increase pressure when whirl spraying.
Further, in the multiple pressure spray process, on keeping rotary spray technique parameter basis, weight is carried out in identical soil layer
Multiple slip casting can guarantee that slip casting destroys length and plays the role of increasing pile body diameter, guarantee concretion body strength in this way.Multiple
All whitewashings during spray, as multiple spray number is increasing, concretion body strength increases effect and obviously improves.
Further, in the control cement consumption technique, when whitewashing is promoted, it is necessary to strictly be controlled to cement consumption
System, the pressure, the diameter of nozzle used when its main and ratio of mud, whitewashing are related with the promotion several factors of speed, can be used with
Lower method is controlled: (1) when cement amount has it is remaining when, properly increase pressure when whitewashing, increase the diameter of nozzle or subtract
Slowly the speed promoted;(2) when cement amount deficiency, grouting pressure is reduced under the premise of guaranteeing that stake diameter meets the requirements, and reduces spray
The diameter of mouth accelerates to be promoted on the basis of guaranteeing pile body integral strength, can also increase the ratio of mud of mud.
Comprehensively consider this engineering practice, each stake is divided into multiple stirring, and dosage accurately controls, true in strict accordance with design
Fixed ratio of mud slurrying, carrying out appropriate adjustment to the above parameter can ensure that cement amount meets design requirement;When cement slurry occur compared with
When big sinking, multiple spray appropriate should be carried out, so as to improve pile body top integral strength.
Further, the method for the grout processing specifically:
It is more than 20% when leakage amount is in slip casting total amount, should be immediately treated after ascertaining the reason;When flow remains unchanged but pressure
When rapid drawdown, needs inspection to be confirmed whether there is leakage, Grouting Pipe is taken out if necessary, examines whether it seals;When grout does not connect
Continuous or not consecutive hours, passes through suitably multiple spray processing;When check discovery around there are secret tunnel and cavity when, no longer in slip casting
Conduit is promoted, continues slip casting until starting grout, can also directly extract conduit, after grout cures in hole, then tripping in
Conduit continues slip casting.Accelerator preparation rapid hardening slurries can be added in the case of necessary;On the basis of guaranteeing that whitewashing amount is constant
Improve the pressure of whirl spraying;Guarantee the size for reducing nozzle on the basis of whirl spraying pressure is constant;Increase the speed for being promoted and being rotated.
Further, in the shape control technique of the induration, the tune to whirl spraying pressure and practical grouting amount can be passed through
Whole to control induration forming shape, this engineering consolidation shape is a cylinder, should carry out while being promoted in construction
Rotate slip casting.To guarantee that deep layer Forming Quality should increase the pressure of whitewashing when whitewashing to bottom, carry out repeating whitewashing.
Further, in the guarantee stake top severity process, during implementing injection using cement grout, because slurries have
There is certain bleed, so can shrink, the top of induration generates pit when this understands, and depth will receive slurry used
The influence of the factors such as liquid, induration diameter and hole depth.For this phenomenon, effective measures should be formulated and handled, such as superelevation
Whirl spraying and bleeding recharge.
Further, the method in the anti-string hole specifically:
In construction, unit should take jump to beat mode;When implementing whirl spraying to high compression soil layer, the pressure of whirl spraying should be reduced;Accelerate
Rotation and the speed promoted.
Further, the method that the pile quality is examined specifically:
After completing high-pressure rotary-spray construction, test to pile quality, inspection project includes:
(1) transverse and longitudinal stake position: deviation extracts total amount of pile 10% and tests no more than 50mm, while each inspection batch
Quantity should reach 5 or more, and the method for inspection is to be measured using theodolite and steel ruler;
(2) pile body verticality: deviation extracts total amount of pile 10% and tests no more than 1%, while each number for examining batch
Amount should reach 5 or more, examine and carried out using theodolite;
(3) stake diameter: being not less than design requirement, extracts total amount of pile 10% and tests, while each quantity for examining batch should reach
To 5 or more, after cutting depth reaches 50-100cm, directly measured using steel ruler.
The method of quality control includes:
D1. construction must be carried out in strict accordance with design parameter and code requirement, according to test result, in conjunction with the geological conditions at scene
With mechanical equipment situation, drill hole of drilling machine is first carried out, then bored grouting;In construction, the promotion rate of drilling rod presses 20cm/min
Control, the speed of rotation are controlled by 20r/min, and the pressure of pump machine is controlled in 35MPa;When not obtaining the approval of technical staff,
Technological parameter can not be changed without authorization;
D2. projected depth refers to the geological conditions confirmed through geotechnical boring, and the brill for reaching supporting course needs is deep;In mortar depositing construction
In, needing length in reserve is the pile crown of 50cm or so, avoid slurries shrink the intensity and absolute altitude of stake top are caused it is unfavorable
It influences;
D3. during jet groutinl, guarantee the continuity and uniformity promoted, no matter because which kind of reason stops injection, all
At least overlap joint of 500mm was carried out before restoring injection, pile body is avoided to disconnect, generate burning into sand and folder mud phenomenon;
D4. when high-pressure injection, if pressure abrupt change, is significantly increased leakage amount, or does not have grout, will stop being injected into
Row checks, after determining producing cause, processing of adopting an effective measure;
D5. in view of rotary churning pile integral strength is relatively low, so should be carried out using artificial when being excavated to pile crown, can not make
It is excavated with mechanical equipment cruelty, influences the globality of pile body, pile body is damaged;
D6. unusable large-scale weight during pile crown is abolished, in order to avoid by stake top lower part pile damage.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.It is noted that the technical characteristic being not described in detail in the present invention, can pass through this
Field any prior art is realized.
Claims (9)
1. a kind of Construction of High Pressure Jet Grouting Pile method applied to green engineering foundation stabilization, which comprises the following steps:
A. preparation of construction;
B. it constructs measuring;
C. grouting process;
The grouting process includes: whirl spraying, multiple spray, control cement consumption, grout processing, the shape control of induration, guarantees stake
Push up intensity, anti-string hole, pile quality inspection;
D. quality controls.
2. according to by the Construction of High Pressure Jet Grouting Pile method described in claim 1 applied to green engineering foundation stabilization, feature
It is, the method for the preparation of construction includes following aspect:
It A1. is according to carrying out site clearing and smooth with the actual conditions at scene;
A2. it combines design requirement and the relevant technologies to provide, carries out technology and safety is told somebody what one's real intentions are and security civilization education;
A3. it according to owner and supervisor's requirement, determines that suitable position first carries out test pile, is determined by test pile necessary
Technical parameter, such as the type of nozzle, drilling depth, promote speed, whirl spraying pressure and flow, the slurries ratio of mud, stake diameter and stake intensity;
A4. the work in every before drawing joint examination is carried out;
A5. it is closely connected and cooperates with supervisor with construction unit;
A6. water flowing energization and place are hardened;
A7. necessary living facilities are set up;
A8. mechanical equipment real-world operation situation is checked;
A9. the specific location of cement laydown platform etc. is determined according to horizontal layout situation.
3. according to by the Construction of High Pressure Jet Grouting Pile method described in claim 1 applied to green engineering foundation stabilization, feature
It is, the method for the construction measuring includes following aspect:
B1. start setting-out using the method for polygon control survey according to the control point that construction unit proposes with steel ruler and theodolite, put
Sample precision should reach claimed below: error is no more than ± 10S in angle, and error is no more than ± 5mm in distance;
B2. according to on-site actual situations, the control point on main shaft is moved to the place not being destroyed, while takes measures to be subject to
Effective protection;
B3. after axis being reviewed confirmation qualification, start the measurement of stake site, it is desirable that its precision reaches ± 30mm or more;
B4. the Site visa-an important chain for carrying out measurement review, guarantees the accuracy and integrality of correlation technique data.
4. according to by the Construction of High Pressure Jet Grouting Pile method described in claim 1 applied to green engineering foundation stabilization, feature
It is, the method for the whirl spraying specifically: it is carried out continuously by sequence from top to bottom, if machine halt trouble occurs in construction,
Should be after maintenance process be good, downward overlap joint handles at least 500mm.
5. according to by the Construction of High Pressure Jet Grouting Pile method described in claim 1 applied to green engineering foundation stabilization, feature
It is, the method for the grout processing specifically:
It is more than 20% when leakage amount is in slip casting total amount, should be immediately treated after ascertaining the reason;When flow remains unchanged but pressure
When rapid drawdown, needs inspection to be confirmed whether there is leakage, Grouting Pipe is taken out if necessary, examines whether it seals;When grout does not connect
Continuous or not consecutive hours, passes through suitably multiple spray processing;When check discovery around there are secret tunnel and cavity when, no longer in slip casting
Conduit is promoted, continues slip casting until starting grout, can also directly extract conduit, after grout cures in hole, then tripping in
Conduit continues slip casting.
6. according to by the Construction of High Pressure Jet Grouting Pile method described in claim 1 applied to green engineering foundation stabilization, feature
Be, the method for grout processing further include: guarantee whitewashing measure it is constant on the basis of improve the pressure of whirl spraying;Guarantee whirl spraying pressure
Reduce the size of nozzle on the basis of power is constant;Increase the speed for being promoted and being rotated.
7. according to by the Construction of High Pressure Jet Grouting Pile method described in claim 1 applied to green engineering foundation stabilization, feature
It is, the method in the anti-string hole specifically: in construction, unit should take jump to beat mode;When to the implementation whirl spraying of high compression soil layer
When, the pressure of whirl spraying should be reduced;The speed for spinning up and being promoted.
8. according to by the Construction of High Pressure Jet Grouting Pile method described in claim 1 applied to green engineering foundation stabilization, feature
It is, the method that the pile quality is examined specifically:
(1) transverse and longitudinal stake position: deviation extracts total amount of pile 10% and tests no more than 50mm, while each inspection batch
Quantity should reach 5 or more, and the method for inspection is to be measured using theodolite and steel ruler;
(2) pile body verticality: deviation extracts total amount of pile 10% and tests no more than 1%, while each number for examining batch
Amount should reach 5 or more, examine and carried out using theodolite;
(3) stake diameter: being not less than design requirement, extracts total amount of pile 10% and tests, while each quantity for examining batch should reach
To 5 or more, after cutting depth reaches 50-100cm, directly measured using steel ruler.
9. according to by the Construction of High Pressure Jet Grouting Pile method described in claim 1 applied to green engineering foundation stabilization, feature
It is, the method for the quality control includes:
D1. construction must be carried out in strict accordance with design parameter and code requirement, in conjunction with the geological conditions and mechanical equipment feelings at scene
Condition first carries out drill hole of drilling machine, then bored grouting;In construction, the promotion rate of drilling rod is controlled by 20cm/min, the speed of rotation
It is controlled by 20r/min, the pressure of pump machine is controlled in 35MPa;When not obtaining the approval of technical staff, technique can not be joined
Number is changed without authorization;
D2. projected depth refers to the geological conditions confirmed through geotechnical boring, and the brill for reaching supporting course needs is deep;In mortar depositing construction
In, needing length in reserve is the pile crown of 50cm or so;
D3. during jet groutinl, guarantee the continuity and uniformity promoted, no matter because which kind of reason stops injection, all
At least overlap joint of 500mm was carried out before restoring injection;
D4. when high-pressure injection, if pressure abrupt change, is significantly increased leakage amount, or does not have grout, will stop being injected into
Row checks, after determining producing cause, processing of adopting an effective measure;
D5. in view of rotary churning pile integral strength is relatively low, so should be carried out using artificial when being excavated to pile crown, can not make
It is excavated with mechanical equipment cruelty;
D6. unusable large-scale weight during pile crown is abolished.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113336487A (en) * | 2021-06-22 | 2021-09-03 | 长安大学 | Geopolymer and construction method for reinforcing roadbed by high-pressure jet grouting pile |
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CN101429766A (en) * | 2008-11-27 | 2009-05-13 | 吴哲慧 | Ground strengthened high pressure rotary spraying pile construction technique |
CN102322058A (en) * | 2011-06-17 | 2012-01-18 | 北京荣创科宏岩土工程有限公司 | Construction process and equipment for downhole impacting high-pressure jet grouting pile |
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