CN110387867B - Method suitable for reinforcing triaxial mixing pile under condition of peat soil stratum - Google Patents
Method suitable for reinforcing triaxial mixing pile under condition of peat soil stratum Download PDFInfo
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- CN110387867B CN110387867B CN201910676515.6A CN201910676515A CN110387867B CN 110387867 B CN110387867 B CN 110387867B CN 201910676515 A CN201910676515 A CN 201910676515A CN 110387867 B CN110387867 B CN 110387867B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—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
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
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Abstract
The invention discloses a method for reinforcing a triaxial mixing pile under the condition of a peat soil stratum, which comprises the following steps: positioning the pile core; erecting a three-shaft mixing pile machine, and aligning the center of a drill rod of the three-shaft mixing pile machine to a pile center; starting a triaxial mixing pile machine, sinking a drill rod to a peat soil layer from the ground, and spraying and mixing the slurry while sinking; when the slurry is sprayed and stirred to the bottom of the peat soil stratum, the drill rod is lifted back, and the slurry is sprayed and stirred while the drill rod is lifted; after repeated sinking and lifting, drilling is completed; the slurry sprayed by the triaxial mixing pile machine is prepared by mixing cement, water, sodium chloride and gypsum powder in advance according to a certain proportion. The invention effectively controls the reinforcement quality of the triaxial mixing pile in the peat soil stratum by comprehensively using methods of adjusting the cement mixing amount, changing the spraying and stirring times, using an additive and the like.
Description
Technical Field
The invention belongs to the field of shield engineering, and particularly relates to a method for reinforcing a triaxial mixing pile under the condition of a peat soil stratum.
Background
The existing triaxial mixing pile reinforcing process has limitation in application, and the conventional triaxial mixing pile process is applied to treatment of foundations such as normally consolidated silt, saturated loess, plain filling soil, cohesive soil, saturated loose sandy soil without flowing underground water and the like. When treating the foundation with the conditions of peat soil, organic soil, clay with plasticity index more than 25, groundwater with corrosivity and the like, a field test is needed to determine construction parameters.
Disclosure of Invention
The invention mainly aims at the defects of the prior art, provides a method suitable for reinforcing a triaxial mixing pile under the condition of a peat soil stratum, and solves the problem that the construction process in the foundation reinforcement of the triaxial mixing pile at the starting or receiving end of a shield under the condition of the peat soil stratum can not meet the quality requirement.
In order to achieve the technical effects, the technical scheme adopted by the invention is as follows:
a method for reinforcing a triaxial mixing pile under the condition of a peat soil stratum comprises the following steps:
positioning the pile core;
erecting a triaxial mixing pile machine, and aligning the center of a drill rod of the triaxial mixing pile machine to the pile center;
starting a triaxial mixing pile machine, sinking a drill rod to a peat soil layer from the ground, and spraying and mixing the slurry while sinking;
when the slurry is sprayed and stirred to the bottom of the peat soil stratum, the drill rod is lifted back, and the slurry is sprayed and stirred while the drill rod is lifted;
after the sinking and the lifting are repeated for a plurality of times in a circulating mode, drilling is finished;
the slurry sprayed by the triaxial mixing pile machine is prepared by premixing cement, water, sodium chloride and gypsum powder in a certain proportion.
The invention effectively controls the reinforcement quality of the triaxial mixing pile in the peat soil stratum by comprehensively utilizing methods of adjusting the cement mixing amount, changing the spraying and stirring times, using an additive and the like, improves the reinforcement quality on the basis of the conventional triaxial mixing pile reinforcement process, obtains the triaxial mixing pile reinforcement process suitable for the peat soil stratum condition, and provides reference for reinforcement of a peat soil shield end foundation.
In some embodiments of the method of the present invention, the number of said reciprocations is 4.
In some embodiments of the method of the invention, the rate of sinking of the drill rod does not exceed 1 m/min.
In some embodiments of the method of the present invention, the drill pipe is lifted at a speed of no more than 0.5 m/min.
In some embodiments of the method of the present invention, the guniting pressure is 1.5 to 2.0 MPa.
In some embodiments of the method, after the drill rod is sunk to the position each time, the drill rod is sprayed and lifted after staying at the pile bottom for 60 seconds.
In some embodiments of the method of the present invention, the weight ratio of cement, water, sodium chloride and landplaster in the slurry is 30000: 45000: 904: 603.
in some embodiments of the method of the present invention, the slurry is mixed with 600kg of cement, 900kg of water, 18.08kg of sodium chloride and 12.06kg of landplaster.
In some embodiments of the method of the present invention, the cement is a PO42 · 5 portland cement.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 shows an exemplary flow diagram of a method for triaxial mixing pile consolidation under peat soil formation conditions, according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The invention relates to a method for reinforcing a triaxial mixing pile in a peat soil-containing stratum, belonging to the field of constructional engineering. The shield launching and receiving are used as key processes of shield subsection engineering in rail transit construction, and the end reinforcement quality is a necessary measure for shield launching and receiving safety. In urban rail transit construction, foundation reinforcement has various forms, and various process methods such as freezing method reinforcement, secant pile reinforcement, cement soil mixing pile reinforcement, MJS method reinforcement and the like are different in applicable geological conditions and different in adopted construction method.
The invention aims to make up the defect that the construction process cannot meet the quality requirement in foundation reinforcement of the shield originating receiving end triaxial mixing pile in the conventional rail transit, and provides a method suitable for reinforcing the triaxial mixing pile in a peat-containing soil stratum. The reinforcing quality of the triaxial mixing pile in the peat soil stratum can be effectively controlled by comprehensively using methods of adjusting the cement mixing amount, changing the spraying and stirring times, using additives and the like.
Specifically, with reference to fig. 1, an embodiment of the present invention provides a method for reinforcing a triaxial mixing pile under a peat soil formation condition, which mainly includes the following steps:
step 01: positioning the pile core;
step 02: erecting a three-shaft mixing pile machine, and aligning the center of a drill rod of the three-shaft mixing pile machine to a pile center;
step 03: starting a triaxial mixing pile machine, sinking a drill rod to a peat soil layer from the ground, and spraying and mixing the slurry while sinking;
step 04: when the slurry is sprayed and stirred to the bottom of the peat soil stratum, the drill rod is lifted back, and the slurry is sprayed and stirred while the drill rod is lifted;
step 05: and after the drilling machine sinks and lifts repeatedly for many times, drilling is finished.
The slurry sprayed by the triaxial mixing pile machine is prepared by mixing cement, water, sodium chloride and gypsum powder in advance according to a certain proportion.
By adopting the technical scheme, the reinforcement quality of the triaxial mixing pile in the peat soil stratum is effectively controlled by comprehensively utilizing methods of adjusting the cement mixing amount, changing the spraying and stirring times, using an additive and the like, and the reinforcement process is improved on the basis of the conventional triaxial mixing pile reinforcement process, so that the triaxial mixing pile reinforcement process suitable for the peat soil stratum is obtained, and a reference is provided for reinforcement of a peat soil shield end foundation.
The following further illustrates the construction steps and the advantageous effects of the method of the present invention by a more specific example, which is as follows:
1. equipment preparation
The triaxial mixing pile machine adopts a JB160A triaxial mixing pile machine. 3 stirring shafts with the center distance of 600mm, the outer diameter of the stirring blade of 850mm and the rotating speed of 16 r/min. The auxiliary equipment is an air compressor, 8m 3/min. Automatic stirring system 1.8m 3. Grouting pump BW 250.
2. Material preparation
According to actual requirements on site, materials such as ordinary Portland cement PO42 & 5, industrial salt NaCl, gypsum powder and the like are prepared.
600kg of cement, 900kg of water, 18.08kg of sodium chloride and 12.06kg of gypsum powder are mixed in each barrel of slurry. The water-cement ratio is 1.5, and the specific gravity of the slurry is 1.3-1.4. The sodium chloride in the grout mainly plays a role in improving the early strength performance of the grout, and the gypsum powder mainly plays a role in neutralizing the acidity of peat soil and improving the hardening performance of the grout.
3. Construction method and steps
Firstly, accurate measurement is carried out before construction, the direction of a central line and a level base point are checked, the axial line position of a main body structure is utilized when no error occurs, and a construction control line is erected.
Secondly, rolling and compacting the ground on the leveled original ground, and moving the leveling and supporting drilling machine to enable the center of the drill bit of the pile machine to be accurately aligned with the center of the pile position. Controlling the verticality of the pile: in order to ensure that the bottom of the long spiral drilling pile has enough thickness of engagement, the verticality is strictly controlled, and the verticality deviation of the pile is not more than 1% according to the design and acceptance rules. The verticality of the pile is well controlled in the hole forming process.
Thirdly, preparing cement slurry at the background. 600kg of cement, 900kg of water, 18.08kg of sodium chloride and 12.06kg of gypsum powder are mixed in each barrel of slurry. The cement mixing amount of the triaxial mixing pile is set to 28%, so that the strength requirement of the pile body can be met, and the construction cost is saved.
Stirring and guniting from the ground to the peat soil layer, starting to lift the drill after the guniting is carried out to the bottom of the peat soil layer for 1m, wherein the sinking speed of a drill rod is not more than 1m/min and the lifting speed is not more than 0.5m/min in the construction process, the process is 2-spraying and 2-stirring, the processes of drilling down and lifting both participate in guniting and stirring, and the process is repeated for 4 times, and 8-spraying and 8-stirring are carried out.
Specifically, the spraying and stirring method is different from the spraying and stirring process of the conventional stirring pile, and is implemented by adopting a method of 8 spraying and 8 stirring:
spraying 2 for the first time and stirring: the method is mainly used for uniformly stirring all soil layers, and gypsum powder and sodium chloride in the slurry assist in improving the soil quality.
And 2, spraying for the second time and stirring: the process mainly treats a peat soil layer in a stratum, the drilling is started to be lifted after the drilling, spraying and stirring are carried out from the ground to the bottom of the peat soil stratum by 1m, the sinking speed of a drill rod is not more than 1m/min, the lifting speed is not more than 0.5m/min, the spraying amount is 30% of the total slurry amount in the construction process, and the peat soil is mainly replaced as far as possible by stirring and spraying.
And (3) spraying 2 and stirring for the third time: the process is to carry out stirring guniting construction on the basis of the previous two steps, wherein the guniting amount is 40% of the total guniting amount, and the process enables the triaxial stirring pile to be formed into a pile preliminarily.
Fourth 2, spraying 2 and stirring: the process is used for reinforcing the pile body, cement paste and the soil body are uniformly mixed through stirring and a small amount of guniting (the guniting amount is 10% of the total grout amount), and the continuity and the quality of the pile body are further guaranteed.
In the spraying and stirring pile forming process, 4 times of 2 spraying and 2 stirring are adopted, and layer-by-layer progression and synergistic effect are achieved, so that the triaxial stirring pile with better continuity and quality can be achieved.
And fifthly, the sinking and lifting speed of the drill rod cannot exceed 1.5m/min in the construction process, the guniting pressure is 1.5-2.0MPa in the construction process of the triaxial mixing pile, and the flow rate of a single pump is not less than 80L/min. When the construction reaches the designed depth, the construction needs to stay at the bottom of the pile for 60 seconds and then the guniting lifting is continued.
The method for reinforcing the triaxial mixing pile under the condition of the peat soil stratum adopts a mode of 2-time spraying and 2-time stirring, 4-time repeating and 8-time spraying and 8-time stirring to form the hole. The pile body is fully stirred, the sinking and lifting speed of the drill hole is strictly controlled, the sinking and lifting force is uniform, the soil body is fully crushed, and cement paste and soil are uniformly mixed. The drilling and hoisting speed is calculated according to the following theoretical formula:
wherein: h is the pile length, K is a parameter, and the sum of the proportion is 1 according to the spraying and stirring times. v is the slurry volume and Q is the single pump slurry flow.
In addition, the invention adopts specially-made cement paste, the flow rate and the grouting pressure of the cement paste are manually controlled, the cement consumption and the liquid level height of each stirring barrel are strictly controlled, the water consumption is controlled by the total amount, and the specific gravity of the cement paste is checked by a specific gravity meter at any time. Because the slurry configuration has human factors, in order to reduce slurry difference caused by the human factors, the weight of cement, the weight of industrial salt and the weight of gypsum powder in the configuration process of each barrel of slurry should be determined by an auxiliary platform scale. The quality of the added water is controlled by a flowmeter. Before construction, the accuracy of instruments such as a pressure meter, a flow meter and the like needs to be checked.
Therefore, the construction process for reinforcing the shield launching or receiving end triaxial mixing pile under the condition of the peat soil stratum provided by the invention reduces the problem of repeated pile test of similar stratum, and has good economic benefit and environmental protection benefit.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A method for reinforcing a triaxial mixing pile under the condition of a peat soil stratum is characterized by comprising the following steps:
positioning the pile core;
erecting a triaxial mixing pile machine, and aligning the center of a drill rod of the triaxial mixing pile machine to the pile center;
starting a triaxial mixing pile machine, sinking a drill rod to a peat soil layer from the ground, spraying and stirring in the sinking process, wherein the spraying and stirring in each sinking process are 2 spraying and 2 stirring;
when the slurry is sprayed and stirred to the bottom of the peat soil stratum, the drill rod is lifted back, the slurry is sprayed and the stirring is carried out in the lifting process, and the 2-spraying and 2-stirring process is carried out in each lifting process;
after the sinking and the lifting are circularly reciprocated for 4 times, 8 times of spraying and 8 times of stirring are carried out to complete the drilling;
the slurry sprayed by the triaxial mixing pile machine is prepared by premixing cement, water, sodium chloride and gypsum powder in a certain proportion;
the 8-spraying and 8-stirring step comprises the following steps:
spraying 2 for the first time and stirring: stirring and guniting the ground to the bottom of the pile by drilling, and lifting the drill to stir and guniting, wherein the guniting proportion is 20% of the total grout amount, the process aims to uniformly stir all soil layers, and gypsum powder and sodium chloride in the grout assist in improving the soil quality;
and 2, spraying for the second time and stirring: the process is used for treating a peat soil layer in the stratum, drilling and spraying are carried out from the ground to the bottom of the peat soil stratum by 1m, then the drill stem is lifted, the sinking speed of the drill stem is not more than 1m/min, the lifting speed is not more than 0.5m/min, the slurry spraying amount is 30% of the total slurry amount in the construction process, and the peat soil is replaced by stirring and slurry spraying;
and (3) spraying 2 and stirring for the third time: the process is that stirring guniting construction is carried out on the basis of the previous two steps, the guniting amount is 40% of the total guniting amount, and the process enables a triaxial stirring pile to be formed into a pile preliminarily;
fourth 2, spraying 2 and stirring: the process is used for reinforcing the pile body, and the cement paste and the soil body are uniformly mixed through stirring and a small amount of cement spraying, wherein the cement spraying amount is 10 percent of the total cement paste amount, and the continuity and the quality of the pile body are further guaranteed.
2. The method for reinforcing a triaxial mixing pile suitable for the peat soil formation conditions according to claim 1, wherein: the spraying pressure is 1.5-2.0 MPa.
3. The method for reinforcing a triaxial mixing pile suitable for the peat soil formation conditions according to claim 1, wherein: after the drill rod is sunk in place each time, the drill rod stays at the bottom of the pile for 60 seconds and then is sprayed, stirred and lifted.
4. The method for reinforcing a triaxial mixing pile suitable for the peat soil formation conditions according to claim 1, wherein: the weight ratio of the cement, the water, the sodium chloride and the gypsum powder in the slurry is 30000: 45000: 904: 603.
5. the method for reinforcing a triaxial mixing pile suitable for the peat soil formation conditions according to claim 4, wherein: the slurry is prepared by mixing 600kg of cement, 900kg of water, 18.08kg of sodium chloride and 12.06kg of gypsum powder.
6. The method for reinforcing a triaxial mixing pile suitable for the peat soil formation conditions according to claim 1, wherein: the cement is ordinary Portland cement PO42 & 5.
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| CN105906226A (en) * | 2016-04-14 | 2016-08-31 | 杭州来宝得新材料科技有限公司 | Cement mixing pile composite additive, curable material and preparation method of composite additive |
| CN107254314A (en) * | 2017-06-23 | 2017-10-17 | 北京农业职业学院 | A kind of soil-solidified-agent and its preparation method and application |
| CN109626928A (en) * | 2019-01-07 | 2019-04-16 | 昆明理工大学 | A kind of compound curing agent and preparation method thereof suitable for peat soil |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105906226A (en) * | 2016-04-14 | 2016-08-31 | 杭州来宝得新材料科技有限公司 | Cement mixing pile composite additive, curable material and preparation method of composite additive |
| CN107254314A (en) * | 2017-06-23 | 2017-10-17 | 北京农业职业学院 | A kind of soil-solidified-agent and its preparation method and application |
| CN109626928A (en) * | 2019-01-07 | 2019-04-16 | 昆明理工大学 | A kind of compound curing agent and preparation method thereof suitable for peat soil |
Non-Patent Citations (1)
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| 《云南大型商业地产办公楼项目工程管理规划》;XX建筑设计研究院有限公司;《https://jz.docin.com/p-2000413451.html》;20170822;第5-6页 * |
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