CN112854239B - Reinforcing construction method for ultra-deep mucky soil layer triaxial mixing pile - Google Patents
Reinforcing construction method for ultra-deep mucky soil layer triaxial mixing pile Download PDFInfo
- Publication number
- CN112854239B CN112854239B CN202110040091.1A CN202110040091A CN112854239B CN 112854239 B CN112854239 B CN 112854239B CN 202110040091 A CN202110040091 A CN 202110040091A CN 112854239 B CN112854239 B CN 112854239B
- Authority
- CN
- China
- Prior art keywords
- pile
- convection
- stirring
- drill rod
- mixing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- 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
Abstract
The application relates to a reinforcement construction method for a three-axis mixing pile of an ultra-deep mucky soil layer, which comprises the following steps: s1, removing underground obstacles and leveling the field; s2, measuring and setting out, and determining pile positions; s3, digging a groove and rechecking a pile position; s4, positioning the pile driver, leveling and straightening; s5, mixing the slurry; s6, stirring, spraying, sinking and lifting; s7, processing the waste soil; s8, cleaning a pipeline and a stirring head; in the step S6, firstly, analysis is carried out according to the early-stage geological exploration result, a triaxial mixing pile machine is used for carrying out spiral drilling, and when the mixing head of the triaxial mixing pile machine enters a muddy stratum, the rotating speed of the mixing head of the triaxial mixing pile machine is increased. This application has the improvement and consolidates the quality for the better effect of construction quality of triaxial stirring stake in deep weak soil.
Description
Technical Field
The application relates to the field of foundation pit reinforcement, in particular to a construction method for reinforcing a three-axis mixing pile of an ultra-deep mucky soil layer.
Background
The triaxial mixing pile is one kind of long spiral pile, and the stake machine has three auger drilling simultaneously, and three auger drilling are under construction simultaneously during construction, is an effective form of soft foundation treatment, utilizes the stirring stake machine to spout cement into the soil body and intensive mixing, makes cement and soil take place a series of physical chemistry reaction, makes the weak soil induration and improves foundation strength.
Although the soft foundation reinforcing method of the triaxial mixing pile has a good reinforcing effect when the depth of the foundation pit is shallow, the cement coagulation effect is good in a sand layer; however, when the reinforcing depth is gradually deepened, the reinforcing effect is difficult to control, and meanwhile, when the three-shaft stirring pile is in muddy soil, the reinforcing effect is influenced by the content of organic matters in the three-shaft stirring pile, and the pile forming effect is poorer than that of a sand layer.
In view of the above-mentioned related art, the inventor believes that there is a defect that the construction quality of the triaxial mixing pile in deep soft soil is poor.
Disclosure of Invention
In order to improve the construction quality of the triaxial mixing pile in deep soft soil, the application provides a reinforcement construction method for the triaxial mixing pile of the ultra-deep mucky soil layer.
The application provides a construction method for reinforcing a three-axis mixing pile of an ultra-deep mucky soil layer, which adopts the following technical scheme:
a reinforcing construction method for a three-axis mixing pile of an ultra-deep mucky soil layer comprises the following steps:
s1, removing underground obstacles and leveling the field;
s2, measuring and setting out, and determining pile positions;
s3, digging a groove and rechecking a pile position;
s4, positioning the pile driver, leveling and straightening;
s5, mixing the slurry;
s6, stirring, spraying, sinking and lifting;
s7, processing the waste soil;
s8, cleaning a pipeline and a stirring head;
in the step S6, firstly, analysis is carried out according to the early-stage geological exploration result, a triaxial mixing pile machine is used for carrying out spiral drilling, and when the mixing head of the triaxial mixing pile machine enters a muddy stratum, the rotating speed of the mixing head of the triaxial mixing pile machine is increased.
By adopting the technical scheme, after the triaxial mixing pile machine drills into a mucky soil layer, the replacement efficiency of cement soil is improved by increasing the rotating speed, the reinforcement quality is improved, and the construction quality of the triaxial mixing pile in deep soft soil is better.
Preferably, in the step S6, the triaxial mixing pile body adopts a two-mixing and two-spraying construction process, cement and undisturbed soil need to be uniformly mixed, grouting stirring is performed in both the sinking and lifting processes, the first grouting amount is controlled at 40%, and the second grouting amount is controlled at 60%.
By adopting the technical scheme, the undisturbed soil and the cement can be fully and uniformly stirred, and the pile forming quality is better.
Preferably, in the step S6, the sinking speed of the drill rod is not more than 1.0 m/min; the lifting speed is not more than 0.8 m/min; the stirring and guniting should be repeated at the bottom part 1m of the pile.
By adopting the technical scheme, the construction time of the mixing pile is directly determined by the drilling and lifting speed of the pile machine, and the construction time of the mixing pile is prolonged by repeatedly mixing and spraying the slurry, so that the construction quality of the triaxial mixing pile in deep soft soil is better.
Preferably, triaxial stirring stake machine includes axis drilling rod and is located the outer axle drilling rod of axis drilling rod both sides, the axis drilling rod rotates and is connected with the convection current sleeve, the convection current sleeve is provided with the convection current flabellum, the telescopic turning to of convection current is opposite with the turning to of axis drilling rod.
By adopting the technical scheme, when the drill bit at the bottom of the center shaft drill rod loosens the soil, the loosened soil body is divided by the convection sleeve which is opposite to the direction of the center shaft drill rod, the flow direction of partial soil body is opposite to the movement direction of the soil body driven by the drill bit at the bottom of the center shaft drill rod, the soil body loosening effect is good, and meanwhile, the relative rotating speed of the convection sleeve which rotates reversely and the drill bit at the bottom of the center shaft drill rod is large, and the stirring effect is good.
Preferably, axis drilling rod and outer axle drilling rod all are provided with and are used for carrying out the stirring flabellum that stirs with the soil body and cement, stirring flabellum spiral set, convection current flabellum spiral set just is close to the telescopic lower extreme of convection current, the screw direction of convection current flabellum is opposite with stirring flabellum's screw direction.
By adopting the technical scheme, the direction of the convection fan blades and the direction of the stirring fan blades to the soil body are opposite all the time, and the mixing effect of the soil body and the cement is better.
Preferably, one end of the convection sleeve, which is far away from the convection fan blades, is provided with an auxiliary convection sheet, the auxiliary convection sheet is spirally arranged, and the spiral direction of the auxiliary convection sheet is opposite to that of the convection fan blades.
Through adopting above-mentioned technical scheme, make the convection current sleeve along the soil body flow opposite direction at vertical direction's both ends, the mixture of the soil body that is close to the convection current sleeve both ends and cement moves towards the telescopic middle section of convection current simultaneously or keeps away from the telescopic middle section of convection current, the mixed stirring effect of soil body and cement is better, and because vice convection current piece is unanimous with the rotation direction of the drill bit of axis drilling rod bottom, make and be located the mixing process of the peripheral soil body of convection current sleeve and cement, be difficult for receiving the influence of the soil body of longer department, local mixing effect is better.
Preferably, a drive assembly is connected to the convection sleeve.
By adopting the technical scheme, the convection sleeve can adjust the rotating speed according to the treatment depth of the foundation, the stirring effect of soil and cement is improved, and the pile forming quality is better.
Preferably, drive assembly includes drive tooth, linkage tooth and driven tooth, driven tooth is fixed in on the convection current sleeve, the drive tooth is fixed in on arbitrary one outer axle drilling rod, the center of driven tooth and the central line collineation of axis drilling rod, the center of driven tooth and the central line collineation of outer axle drilling rod, the linkage tooth is located between driven tooth and the drive tooth, linkage tooth and drive tooth and driven tooth meshing.
By adopting the technical scheme, the outer shaft drill rod drives the linkage teeth to rotate in the rotating process, the linkage teeth drive the driven teeth to rotate, the convection sleeve and the driven teeth synchronously rotate, the mixing effect of soil and cement is increased in the rotating process of the convection sleeve, the driving source is reduced, and the pile forming quality is better.
Preferably, triaxial stirring stake machine still includes the drive support frame, axis drilling rod and outer axle drilling rod all rotate with the drive support frame and are connected, two outer axle drilling rod all is fixed with the initiative tooth, the linkage tooth rotates to be connected on the drive support frame.
Through adopting above-mentioned technical scheme, the setting of drive support frame makes axis drilling rod and outer axle drilling rod difficult emergence skew at the in-process of drilling, and simultaneously, the linkage tooth is attached to on the drive support frame, and the linkage tooth is difficult for droing, prolongs its life.
Preferably, two ends of the linkage teeth in the vertical direction are fixedly connected with a guide drill bit.
By adopting the technical scheme, as the driving component is far away from the drill bit at the bottom of the middle shaft drill rod and the outer shaft drill rod, the looseness of the soil body at the periphery of the driving component is smaller, the resistance is larger along with the deepening of the driving component in the process that the driving component moves along with the middle shaft drill rod and the outer shaft drill rod, and the arrangement of the guide drill bit can lead the soil body at the periphery of the driving component to be loose, thereby reducing the resistance when the driving component moves, meanwhile, the arrangement of the guide drill bit can lead the soil body at the periphery of the driving component to be uniformly mixed with cement, when the convection sleeve rotates, the soil body at the periphery of the driving component is driven to move towards the bottom of the middle shaft drill rod and is uniformly mixed, or the soil body at the periphery of the convection barrel body moves towards the bottom far away from the middle shaft drill rod, the mixture of the soil body and the cement at the periphery of the convection barrel body is impacted and mixed with the mixture of the soil body and the cement at the periphery of the driving component, the mixing is more uniform, and the pile forming quality is better.
In summary, the present application includes at least one of the following beneficial technical effects:
1. after the triaxial mixing pile machine drills into a mucky soil layer, the replacement efficiency of cement soil is improved by increasing the rotating speed, the reinforcement quality is improved, and the construction quality of the triaxial mixing pile in deep soft soil is better;
2. when the drill bit at the bottom of the center shaft drill rod loosens the soil, the convection sleeve which is opposite to the rotation direction of the center shaft drill rod divides the loosened soil body, the flow direction of partial soil body is opposite to the movement direction of the soil body driven by the drill bit at the bottom of the center shaft drill rod, the soil body loosening effect is good, meanwhile, the relative rotating speed of the convection sleeve which rotates reversely and the drill bit at the bottom of the center shaft drill rod is large, and the stirring effect is good;
3. the outer shaft drill rod drives the linkage teeth to rotate in the rotating process, the linkage teeth drive the driven teeth to rotate, the convection sleeve and the driven teeth rotate synchronously, the mixing effect of soil and cement is improved in the rotating process of the convection sleeve, the driving sources are reduced, and the pile forming quality is good.
Drawings
Fig. 1 is a schematic structural diagram of a triaxial mixing pile machine in this embodiment.
Fig. 2 is a partially enlarged schematic view at a in fig. 1.
Description of reference numerals: 1. a middle shaft drill rod; 11. a middle shaft drill bit; 2. an outer shaft drill rod; 21. an outer shaft drill bit; 3. a convection sleeve; 31. a convection fan blade; 4. a stirring fan blade; 32. a secondary convection sheet; 5. a drive assembly; 51. a driving tooth; 52. a linkage tooth; 53. a driven tooth; 6. driving the support frame; 7. a pilot bit; 8. a power head; 9. a drill rod support frame.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses a reinforcement construction method for a three-axis mixing pile of an ultra-deep mucky soil layer. The method comprises the following steps:
s1, removing underground obstacles and leveling the field;
and (4) carrying out road occupation, traffic mediation and greening pipeline migration on the site of the construction site, and enclosing the construction site. The method comprises the following steps of firstly leveling a field, making a plan installation of a cement tank storage field and a slurry mixing field, and excavating drainage ditches on the inner side of the periphery of the enclosure to ensure that no water is accumulated in the field in rainy seasons. Clearing all barriers on the ground and underground at the pile position, wherein the barriers comprise various pipelines, boulders, tree roots, domestic garbage and the like, if the field is a hard pavement such as concrete and the like, the barriers are broken by a breaking head of an excavator in advance, and the construction is carried out in a mode of breaking one section at a first construction section and retreating. If the site is a trench cut or a low-lying place, soil, slag and stones on the concrete pavement are backfilled and broken, and a steel plate with the thickness of 1cm needs to be arranged above the filled soil if necessary, so that the safety of equipment during construction is ensured, and dangerous situations such as inclination and lodging of the equipment are prevented.
S2, measuring and setting out, and determining pile positions;
the method comprises the steps of adopting a total station to carry out axis pile position positioning, emitting outline sidelines of a reinforcing area according to a construction design drawing, setting two rows of temporary control piles at a control point of 15-20 m intervals, and setting the two rows of temporary control piles at a distance of 1.5m and 3m from the reinforcing sidelines respectively so that site constructors can control pile position at any time. And checking the control points every day in the construction process, and effectively protecting the control points. For foundation pits with different reinforcement depths, pile depth control measures must be taken in advance. The accessible spouts on stake machine drilling rod and draws the scale mark to control the stake dark, controls the pile bolck and the pile bottom elevation of stirring stake according to stirring stake machine ground actual elevation during the construction, guarantees to consolidate the degree of depth and satisfy the requirement in carrying out the super dark silt texture layer.
S3, digging a groove and rechecking a pile position;
and (3) excavating a guide groove by using an excavator according to the pile position control line, and clearing underground obstacles again, wherein the size of the guide groove is required to be 0.5 m wide and 0.5-1.5 m deep on two sides of the central line respectively, the guide groove is excavated along with excavation in construction, the slurry is ensured not to overflow, the excavated waste slurry is stored in the field open space, and the field waste soil is cleared on time. After the groove is excavated, a construction line is adopted to connect the pile position control piles which are prepared in advance, and the position of the pile is rechecked again.
S4, positioning the pile driver, leveling and straightening;
firstly, positioning a plane, placing a pile position, slowly moving a mixing pile machine to reach the designated pile position, and centering a drill bit; then, adjusting the mixing pile machine, trial-operating the steering brake, the walking brake and the drill rod work brake of the pile machine, bidirectionally controlling the verticality of the guide frame, hanging a plumb ball on the front and the side of a derrick of the mixing pile machine, wherein the weight of the plumb ball is not less than 2kg, measuring the verticality of the stirring shaft according to the deflection of a hanging hammer of the guide frame, monitoring the verticality of a pile body by indirectly measuring the verticality of the guide frame, timely finding whether the mixing pile machine inclines during construction, adjusting the verticality of the guide frame, and according to the design and standard requirements, the verticality of the pile depth is less than 1% of the pile length; and finally, carrying out pile position retest, checking the position of the drill bit according to the control pile after the mixing pile machine is well positioned and adjusted, wherein the pile position centering error is not more than 5 cm.
S5, mixing the slurry;
in the embodiment, 42.5 common portland cement is adopted for reinforcing the triaxial mixing pile, the cement mixing ratio of the solid pile is 22%, the cement mixing ratio of the empty pile is 8%, and the water-cement ratio is 1.1; namely, the requirement is that the solid pile is 674kg/m, and the empty pile is 245 kg/m; and (3) performing bottom crossing on site background constructors: mixing the slurry before drilling, and mixing the slurry according to the parameters of the water-cement ratio of 1.1:1 to ensure that the mixing amount of each disc of cement is 1000kg of water and 910kg of cement, wherein the specific gravity of the slurry is ensured to reach 1.49 kg/L; cement paste is prepared and uniformly stirred in a stirring barrel according to a specified water cement ratio and then is discharged into a slurry storage barrel, and then is pumped and pressurized by 2 grouting pumps and then is pressed into a grouting hole in a drill rod through a grouting pipe; after the cement paste is prepared, the dead time cannot exceed 2 hours, and the construction interval of adjacent stirring piles in lap construction cannot exceed 12 hours.
S6, stirring, spraying, sinking and lifting;
the method comprises the following steps that firstly, according to a previous geological exploration result, a worker carries out geological condition intersection on project site management personnel and operators of the triaxial mixing pile machine, the geological condition in the current construction range is explained, when the project site management personnel and the operators of the triaxial mixing pile machine enter a muddy stratum, the rotating speed of a drilling machine is increased, the cement soil replacement rate is improved, and the pile forming quality of the triaxial mixing pile in deep soft soil is improved.
In the stirring process, a construction process of two-stirring and two-spraying is adopted for a pile body of the triaxial stirring pile, cement and undisturbed soil need to be uniformly stirred, grouting stirring is carried out in the sinking and lifting processes, the first grouting amount is controlled to be 40%, and the second grouting amount is controlled to be 60%; the cement quantity and the liquid level height of every bucket agitator of strict control take total amount control with the cement quantity, and the pile bolck leaks to spout the phenomenon and takes place strictly, and the strict control sinks and promotes speed simultaneously: the sinking speed of the drill rod is not more than 1.0 m/min; the lifting speed is not more than 0.8 m/min; the stirring and guniting should be repeated at the bottom part 1m of the pile.
In the process of guniting, the cement paste is conveyed to the head of the drill rod through a grouting pump and a cement paste pipe, and mechanical parameters are strictly executed according to a design parameter table and requirements during field construction.
In the grouting, stirring and lifting processes, after the pile position is determined, the pile machine starts to stir, sink and spray, the pile bottom position is kept for spraying and stirring for 30s after cement paste reaches the pile bottom, after the cement paste and pile end soil are fully stirred, the stirring head is lifted at a required speed, and the cement paste and original foundation soil are fully stirred and sprayed while stirring until the cement paste and original foundation soil are lifted to the designed elevation of the pile top by 500 mm.
S7, processing the waste soil;
because the cement slurry is quantitatively injected into the stirring hole, a part of cement soil is replaced out of the groove, and the excavator is adopted to clean the cement soil in the groove out of the groove, so that the edge neatness of the groove is kept, and the construction of the next procedure is ensured.
When the cleaned earthwork is piled up, the earthwork is piled up according to the requirement, the piling height is forbidden to be too high, the cleaned cement soil starts to be hardened and covered after 18 hours, and is transported out of the field in time, and the earthwork is forbidden to be piled up too high when loaded, so that the earthwork is prevented from spilling on the road surface in the transportation process.
S8, cleaning a pipeline and a stirring head;
after the construction of a group of mixing piles is completed, the mixing drill bit is lifted above the ground, the main motor is stopped, the air compressor is stopped, and the mixing head of the mixing pile machine is cleaned. And after cleaning, moving the mixing pile machine to the next position by using a hydraulic system of the mixing pile machine, and repeating the steps to construct the next group of piles. When the construction task on duty is finished, a proper amount of clear water is added into the pulping barrel, the mortar pump is started, and a grouting pipeline and other used machines are cleaned.
Referring to fig. 1, the triaxial mixing pile machine comprises a power head 8, a drill rod support frame 9, a middle shaft drill rod 1 and an outer shaft drill rod 2, wherein the outer shaft drill rod 2 is provided with two drill bits which are positioned at two sides of the middle shaft drill rod 1, the bottoms of the middle shaft drill rod 1 and the outer shaft drill rod 2 are both provided with a drill bit, the drill bits comprise a middle shaft drill bit 11 positioned at the bottom of the middle shaft drill rod 1 and an outer shaft drill bit 21 positioned at the bottom of the outer shaft drill rod 2, the middle shaft drill bit 11 is used for loosening soil, and the outer shaft drill bit 21 is used for conveying slurry; the bottom of the middle shaft drill rod 1 close to the middle shaft drill bit 11 is rotatably connected with the convection sleeve 3. The middle shaft drill rod 1 and the outer shaft drill rod 2 are both provided with stirring fan blades 4 for stirring soil and cement, the stirring fan blades 4 are spirally arranged, and the spiral directions of the stirring fan blades 4 on the middle shaft drill rod 1 and the stirring fan blades 4 on the outer shaft drill rod 2 are opposite.
As shown in fig. 2, the diameter of the convection sleeve 3 is reduced from the middle portion to the two ends, the convection sleeve 3 is provided with convection blades 31, the convection blades 31 are spirally arranged and are close to the lower end of the convection sleeve 3, the spiral direction of the convection blades 31 is opposite to the spiral direction of the stirring blades 4, one end of the convection sleeve 3 away from the convection blades 31 is provided with an auxiliary convection piece 32, and the auxiliary convection piece 32 is spirally arranged and has a spiral direction opposite to the direction of the convection blades 31.
The top of convection current sleeve 3 is connected with drive assembly 5, and drive assembly's top fixedly connected with drive support frame 6, drive support frame 6 are integrated into one piece's connecting rod, and axis drilling rod 1 and outer axle drilling rod 2 all rotate with drive support frame 6 and are connected. The driving assembly 5 comprises two driving teeth 51 which are respectively positioned on the outer shaft drill rod 2, two linkage teeth 52 which are rotatably connected to the driving support and a driven tooth 53 which is fixedly connected to the top end of the convection sleeve 3, the linkage teeth 52 are positioned between the driven teeth 53 and the driving teeth 51, the centers of the driven teeth 53 are collinear with the center line of the middle shaft drill rod 1, the centers of the driven teeth 53 are collinear with the center line of the outer shaft drill rod 2, the linkage teeth 52 positioned in the middle are respectively meshed with the driving teeth 51 and the driven teeth 53 which are sequentially connected, the driving teeth 51 drive the linkage teeth 52 to rotate, the linkage teeth 52 synchronously drive the driven teeth 53 to rotate, and the steering direction of the convection sleeve 3 is opposite to that of the middle shaft drill rod 1. The two ends of the linkage teeth 52 in the vertical direction are respectively and fixedly connected with a pilot bit 7, the pilot bit 7 positioned at the upper end of the linkage teeth 52 in the vertical direction penetrates through the driving support frame 6 and is movably connected with the driving support frame 6, and the linkage teeth 52 drive the pilot bit 7 to synchronously rotate in the rotating process.
The implementation principle of the reinforcing construction method for the three-axis mixing pile of the ultra-deep mucky soil layer in the embodiment of the application is as follows: after the triaxial mixing pile machine drills to a mucky soil layer, the middle shaft drill bit 11 is used for loosening soil, the outer shaft drill bit 21 is used for conveying cement slurry, the mixing fan blades 4 positioned on the middle shaft drill rod 1 and the outer shaft drill rod 2 are used for mixing the soil and cement, meanwhile, the rotating directions of the outer shaft drill rod 2 and the inner shaft drill rod are opposite, the mixing efficiency of the soil and the cement is increased, the outer shaft drill rod 2 drives the linkage teeth 52 to rotate in the rotating process, the linkage teeth 52 drive the driven teeth 53 to rotate, the convection sleeve 3 and the driven teeth 53 synchronously rotate, the guide drill bits 7 positioned at two ends of the linkage teeth 52 in the vertical direction rotate, when the triaxial mixing pile machine continuously drills downwards, the convection sleeve 3 rotates in the reverse direction of the middle shaft drill rod 1, the convection fan blades 31 on the convection sleeve 3 are opposite to the spiral direction of the mixing fan blades 4 of the middle shaft drill rod 1, the soil is opposite to the moving direction of the joint of the convection sleeve 3 and the middle shaft drill rod 1, or discharged to both sides along the vertical direction or mixed towards the junction along the vertical direction, the mixing effect of the soil and the cement is increased, meanwhile, because the spiral directions of the auxiliary convection sheets 32 at the top of the convection sleeve 3 are opposite to the spiral directions of the convection blades 31 at the bottom of the convection sleeve 3, the flowing directions of the soil at both ends of the convection sleeve 3 along the vertical direction are opposite, the mixture of the soil and the cement close to both ends of the convection sleeve 3 moves towards the middle section of the convection sleeve 3 or the middle section far away from the convection sleeve 3, the mixing and stirring effect of the soil and the cement is increased, the rotation directions of the auxiliary convection sheets 32 and the drill bit at the bottom of the middle shaft drill rod 1 are consistent, the soil around the convection sleeve 3 is not easily influenced by the soil at the far position in the mixing process of the soil and the cement, meanwhile, the guide drill bits 7 at both ends of the linkage teeth 52 along the vertical direction synchronously rotate, the soil around the driving component 5 is loosened, the resistance of the driving component 5 in motion is reduced, when the convection sleeve 3 rotates, the soil and cement mixture around the driving component 5 is driven to move towards the bottom of the central shaft drill rod 1 and is mixed uniformly, or the soil around the driving component 5 moves towards the bottom far away from the central shaft drill rod 1, the mixture of the soil and cement around the convection barrel body impacts and is mixed towards the mixture of the soil and cement around the driving component 5, and the mixture is mixed more uniformly; when the triaxial mixing pile machine ascends, the middle shaft drill rod 1 and the outer shaft drill rod 2 rotate reversely, the convection sleeve 3 is driven to rotate reversely synchronously, the mixing direction of soil and cement is reversely mixed, the mixing efficiency of the soil and the cement is improved, and the construction quality of the triaxial mixing pile in deep soft soil is improved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (5)
1. A reinforcing construction method for a three-axis mixing pile of an ultra-deep mucky soil layer is characterized by comprising the following steps: the method comprises the following steps:
s1, removing underground obstacles and leveling the field;
s2, measuring and setting out, and determining pile positions;
s3, digging a groove and rechecking a pile position;
s4, positioning the pile driver, leveling and straightening;
s5, mixing the slurry;
s6, stirring, spraying, sinking and lifting;
s7, processing the waste soil;
s8, cleaning a pipeline and a stirring head;
in the step S6, firstly, analysis is carried out according to a previous stage geological exploration result, a triaxial mixing pile machine is used for carrying out spiral drilling, and when a mixing head of the triaxial mixing pile machine enters a muddy stratum, the rotating speed of the mixing head of the triaxial mixing pile machine is increased;
the triaxial mixing pile machine comprises a middle shaft drill rod (1) and outer shaft drill rods (2) positioned on two sides of the middle shaft drill rod (1), wherein the middle shaft drill rod (1) is rotatably connected with a convection sleeve (3), the convection sleeve (3) is provided with convection blades (31), and the steering direction of the convection sleeve (3) is opposite to that of the middle shaft drill rod (1);
the convection sleeve (3) is connected with a driving assembly (5);
the driving assembly (5) comprises a driving tooth (51), a linkage tooth (52) and a driven tooth (53), the driven tooth (53) is fixed on the convection sleeve (3), the driving tooth (51) is fixed on any one outer shaft drill rod (2), the center of the driven tooth (53) is collinear with the center line of the middle shaft drill rod (1), the center of the driven tooth (53) is collinear with the center line of the outer shaft drill rod (2), the linkage tooth (52) is located between the driven tooth (53) and the driving tooth (51), and the linkage tooth (52) is meshed with the driving tooth (51) and the driven tooth (53);
the triaxial mixing pile machine further comprises a driving support frame (6), the middle shaft drill rod (1) and the outer shaft drill rods (2) are rotatably connected with the driving support frame (6), driving teeth (51) are fixed on the two outer shaft drill rods (2), and the linkage teeth (52) are rotatably connected to the driving support frame (6);
and two ends of the linkage teeth (52) along the vertical direction are fixedly connected with a guide drill bit (7).
2. The ultra-deep mucky soil layer triaxial mixing pile reinforcement construction method according to claim 1, characterized in that: in the step S6, a construction process of two-stirring and two-spraying is adopted for the pile body of the triaxial mixing pile, cement and undisturbed soil need to be uniformly mixed, grouting and stirring are carried out in the sinking and lifting processes, the first grouting amount is controlled to be 40%, and the second grouting amount is controlled to be 60%.
3. The ultra-deep mucky soil layer triaxial mixing pile reinforcement construction method according to claim 2, characterized in that: in the step S6, the sinking speed of the drill rod is not more than 1.0 m/min; the lifting speed is not more than 0.8 m/min; the stirring and guniting should be repeated at the bottom part 1m of the pile.
4. The reinforcement construction method of the ultra-deep mucky soil layer triaxial mixing pile according to claim 3, characterized in that: axis drilling rod (1) all is provided with stirring fan blade (4) that are used for carrying out the stirring with the soil body and cement with outer axle drilling rod (2), stirring fan blade (4) spiral setting, convection current flabellum (31) spiral setting just is close to the lower extreme of convection current sleeve (3), the spiral direction of convection current flabellum (31) is opposite with the spiral direction of stirring fan blade (4).
5. The reinforcement construction method of the ultra-deep mucky soil layer triaxial mixing pile according to claim 4, characterized in that: one end, far away from convection flabellum (31), of convection sleeve (3) is provided with vice convection current piece (32), vice convection current piece (32) spiral setting and spiral direction are opposite with the direction of convection flabellum (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110040091.1A CN112854239B (en) | 2021-01-13 | 2021-01-13 | Reinforcing construction method for ultra-deep mucky soil layer triaxial mixing pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110040091.1A CN112854239B (en) | 2021-01-13 | 2021-01-13 | Reinforcing construction method for ultra-deep mucky soil layer triaxial mixing pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112854239A CN112854239A (en) | 2021-05-28 |
| CN112854239B true CN112854239B (en) | 2022-05-27 |
Family
ID=76003206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110040091.1A Active CN112854239B (en) | 2021-01-13 | 2021-01-13 | Reinforcing construction method for ultra-deep mucky soil layer triaxial mixing pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112854239B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114277760B (en) * | 2021-12-25 | 2023-09-01 | 深圳市蛇口招商港湾工程有限公司 | Mucky soil layer stirring pile reinforcing structure and construction method |
| CN114606931A (en) * | 2022-03-04 | 2022-06-10 | 中建一局集团第三建筑有限公司 | Construction method for pit-in-pit reinforcement of triaxial mixing pile |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160109395A (en) * | 2015-03-11 | 2016-09-21 | 송관권 | Agitating road for excavating using soil earth cement mixing method and mixing agitator using the same |
| CN106545011A (en) * | 2016-10-28 | 2017-03-29 | 傅志斌 | The multidirectional mixing pile pile making method of efficient energy-saving |
| CN208441087U (en) * | 2018-06-09 | 2019-01-29 | 王巍 | A kind of mixing pile for geotechnical engineering |
| CN110499757A (en) * | 2019-08-27 | 2019-11-26 | 中铁二局集团有限公司 | A kind of water-rich sand layer three axes agitating pile construction method |
| CN111719552A (en) * | 2020-06-28 | 2020-09-29 | 建基建设集团有限公司 | Construction method of cement mixing pile equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211228477U (en) * | 2019-11-25 | 2020-08-11 | 周文来 | Stirring pile for geotechnical engineering |
-
2021
- 2021-01-13 CN CN202110040091.1A patent/CN112854239B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160109395A (en) * | 2015-03-11 | 2016-09-21 | 송관권 | Agitating road for excavating using soil earth cement mixing method and mixing agitator using the same |
| CN106545011A (en) * | 2016-10-28 | 2017-03-29 | 傅志斌 | The multidirectional mixing pile pile making method of efficient energy-saving |
| CN208441087U (en) * | 2018-06-09 | 2019-01-29 | 王巍 | A kind of mixing pile for geotechnical engineering |
| CN110499757A (en) * | 2019-08-27 | 2019-11-26 | 中铁二局集团有限公司 | A kind of water-rich sand layer three axes agitating pile construction method |
| CN111719552A (en) * | 2020-06-28 | 2020-09-29 | 建基建设集团有限公司 | Construction method of cement mixing pile equipment |
Non-Patent Citations (2)
| Title |
|---|
| 三轴水泥搅拌桩施工技术在工程实践应用分析;吴华南;《中国建设信息化》;20160130(第02期);第一-四节及图1 * |
| 谈水泥搅拌桩穿透淤泥质夹层的处理方法;李春洁等;《安徽建筑》;20180901(第05期);第3节 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112854239A (en) | 2021-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5542782A (en) | Method and apparatus for in situ installation of underground containment barriers under contaminated lands | |
| CN110344400B (en) | Hole-forming pile-forming construction process for rotary drilling rig in hard rock | |
| AU2021106928A4 (en) | Construction method for excavation of deep pit with triaxial mixing pile waterstop curtains and rotary bored cast-in-place pile supports | |
| CN112854239B (en) | Reinforcing construction method for ultra-deep mucky soil layer triaxial mixing pile | |
| CN105780763A (en) | Construction method of medium-hole vibrating casing wall protection type long spiral cast-in-situ bored pile | |
| CN1718942A (en) | Ground caisson construction technology and ground caisson | |
| CN106284365A (en) | A kind of WATER-WASHING METHOD of building foundation pit excavation | |
| CN112609690A (en) | Construction method of rotary drilling cast-in-place pile in sea-filling geological complex area | |
| CN112196494B (en) | Construction process and construction equipment for geological pipeline jointed between rock and soil layer | |
| CN114108654A (en) | Construction method for removing obstacles in foundation pit area invaded by pressure-bearing water dock | |
| CN103806444A (en) | Soft soil layer rotary excavating pile construction method | |
| CN115748786A (en) | Drainage sinking construction method for pipe-jacking circular open caisson | |
| CN113309128B (en) | Construction method of dumbbell-shaped cement soil curtain pile in peat soil stratum | |
| CN114351774A (en) | Method for predicting and processing collapsed hole of cast-in-place pile | |
| CN113914304A (en) | CFG pile long spiral drill hole core pipe pumping mixture pouring pile-forming construction method | |
| CN113404043A (en) | Construction method of full-rotation full-casing drilling machine suitable for karst cave geology | |
| CN111155934A (en) | Gravel layer three-shaft stirrer drill bit and construction method | |
| CN113047843A (en) | Large-diameter pile or vertical shaft pore-forming soil body excavation device | |
| GB2137678A (en) | Method and apparatus for pile construction | |
| JP3042002U (en) | Underground ground improvement device with co-rotation prevention | |
| CN113944182B (en) | Reinforcement treatment construction method under complex geological condition of high-grade extreme racetrack | |
| JPH08260508A (en) | Drilling unit of underground continuous wall, etc. | |
| CN113882353B (en) | Multi-pile type conversion disposal structure under complex geology of extreme racetrack and construction method thereof | |
| CN217150172U (en) | Underground continuous wall system used under weak geological conditions of sea reclamation area | |
| CN111594175B (en) | Hole forming construction method of rotary drilling rig adopting chemical polymer slurry retaining wall |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |