CN112281827A - High-pressure air-disturbed cement-soil mixing pile construction process - Google Patents
High-pressure air-disturbed cement-soil mixing pile construction process Download PDFInfo
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- CN112281827A CN112281827A CN202011210437.XA CN202011210437A CN112281827A CN 112281827 A CN112281827 A CN 112281827A CN 202011210437 A CN202011210437 A CN 202011210437A CN 112281827 A CN112281827 A CN 112281827A
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- 238000002156 mixing Methods 0.000 title claims abstract description 56
- 239000002689 soil Substances 0.000 title claims abstract description 51
- 238000010276 construction Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000004568 cement Substances 0.000 claims abstract description 60
- 239000002002 slurry Substances 0.000 claims abstract description 42
- 238000013461 design Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005553 drilling Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 52
- 238000005507 spraying Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000010907 mechanical stirring Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
- E21B19/084—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods with flexible drawing means, e.g. cables
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a high-pressure air-disturbed cement-soil mixing pile construction process, which comprises the following steps: s1, construction preparation: before construction, leveling a tamping field, and introducing a measurement control net; collecting geological data, researching and analyzing a geological survey report and a design drawing, and analyzing and counting the stratum range influencing the normal construction of the mixing pile; carrying out a process test to determine construction control parameters of the mixing pile; s2, measuring and lofting, and excavating a groove; and S3, transporting the drilling machine to a site to be constructed, positioning and centering according to the set pile position, connecting a high-pressure cement slurry pump and an air compressor, preparing cement slurry in a slurry barrel, and providing the cement slurry to the high-pressure water slurry pump. According to the construction process of the high-pressure air disturbance cement soil mixing pile with the structure, the high-pressure air disturbance mixing soil layer is increased, so that the cement paste and the original soil layer are mixed more uniformly under the combined action of mechanical stirring and high-pressure air flow.
Description
Technical Field
The invention relates to the technical field of mixing pile construction, in particular to a high-pressure air-disturbed cement soil mixing pile construction process.
Background
The existing cement-soil mixing method is to use cement and other materials as curing agent and to force mix the soft soil and curing agent in situ by special mixing machine to make the soft soil hard to form cement-reinforced soil with integrity, water stability and certain strength, thus improving the strength of foundation soil and increasing deformation modulus, and is commonly used for foundation treatment and foundation pit water-intercepting curtain.
When the cement-soil mixing pile is constructed, the mixing frequency is less, the mixing is more uneven, the cement-soil strength is lower, the water interception effect is not good, and the traditional process completely depends on the increase of the mixing frequency to achieve the construction effect. In the technical Specification for treating building foundations J220-2012, it is required: any point of the soil body within the reinforcement depth range is stirred for more than 20 times, so that the construction efficiency is seriously reduced, and the construction cost is increased.
Disclosure of Invention
The invention aims to provide a construction process of a high-pressure air-disturbed cement-soil mixing pile, which enables cement paste and an original soil layer to be mixed more uniformly under the combined action of mechanical stirring and high-pressure air flow and improves the construction efficiency.
In order to achieve the purpose, the invention provides a high-pressure air-disturbed cement-soil mixing pile construction process, which comprises the following steps:
s1, preparation for construction
Before construction, leveling a tamping field, and introducing a measurement control net; collecting geological data, researching and analyzing a geological survey report and a design drawing, and analyzing and counting the stratum range influencing the normal construction of the mixing pile; carrying out a process test to determine construction control parameters of the mixing pile;
s2, measuring and lofting, and excavating groove
Lofting the position of the mixing pile according to a design drawing, excavating a groove along the central line by using an excavator according to the central line of the mixing pile at the lofting position, and synchronously removing earth surface and underground obstacles in the excavation process;
s3, transporting the drilling machine to a site to be constructed, positioning and centering according to the set pile position, connecting a high-pressure cement slurry pump and an air compressor, preparing cement slurry in a slurry barrel, and providing the cement slurry to a high-pressure water slurry pump;
s4, stirring and sinking: starting a drilling machine motor, loosening a steel wire rope of a jack, enabling a drill rod to drive a stirring blade to cut soil and sink according to a designed rotating speed, starting a cement slurry pump and an air compressor when the drill rod sinks, pumping cement slurry and high-pressure gas according to a designed pressure, enabling a soil body to be mixed with the sprayed cement slurry under the disturbance of the stirring blade and high-pressure gas flow, rotating while spraying, and sinking the drill rod strictly according to a sinking speed determined by design;
s5, stirring and lifting: after the drill rod sinks to the designed depth, continuously spraying and injecting the slurry and rotating the drill rod according to the design requirement, and simultaneously lifting the drill rod to the elevation of the pile top strictly according to the lifting speed determined by the design;
s6, repeating up-down stirring: the stirring times are determined strictly according to each design, and the stirring is repeated up and down under the condition of keeping the spraying and air injection states;
and S7, turning off the drilling machine, shifting the whole machine to the designated pile position of the next pile, and repeating the above steps to finish the next mixing pile.
Preferably, the lifting and sinking speed V in the process of guniting and air injection is calculated according to the following formula:
in the formula: v, the guniting lifting speed (m/min) of the stirring head;
gamma d and gamma are the gravities (KN/m) of cement paste and soil respectively3)；
Discharge capacity (m) of Q cement slurry pump3/min)；
Alpha w cement mixing ratio;
the water cement ratio of the cement paste is alpha c;
cross sectional area (m) of F-shaped mixing pile2)。
Preferably, the number of times of stirring per pass N is calculated by the following formula:
in the formula: h width (m) of the stirring blade;
the vertical included angle (DEG) between the beta stirring blade and the stirring shaft;
the total number of sigma Z stirring blades;
n number of revolutions of the stirring head (rev/min);
v the lifting speed (m/min) of the stirring head.
Preferably, the grade of the cement is not less than 32.5, and the water-cement ratio of the slurry is 0.5-0.6.
Preferably, the cement mixing amount of the reinforcement is 12-20%, and the working pressure of a cement slurry pump is not less than 5.0 MPa.
Preferably, the working pressure of the air compressor is 0.7 MPa.
Preferably, the stirring sinking and lifting speed is 0.5-0.8 m/min.
Therefore, the construction process of the high-pressure air disturbance cement soil mixing pile with the structure is adopted, and the high-pressure air flow disturbance mixing soil layer is increased, so that the soil layer is more uniform under the combined action of mechanical mixing and high-pressure air flow.
The high-pressure airflow disturbance stirring is to utilize cement paste material as curing agent, stir the soft soil in the deep stratum and the curing agent (cement paste) uniformly by the stirring machine rotary stirring and high-pressure airflow disturbance, and after a series of physical and chemical reactions are generated between the curing agent and the soil layer, the geological soil layer is hardened into cement reinforced soil with integrity, water stability and certain strength, so that the foundation strength is improved, the deformation modulus is increased, and the permeability is reduced, thereby achieving the purpose of water interception.
The invention is applied to the construction of foundation treatment engineering and the construction of water interception and waterproof curtains, is a technical process measure for improving the bearing capacity of the foundation and the deformation performance or the permeability of the foundation, and improves the construction capacity and the construction efficiency of the traditional cement soil mixing pile.
The invention is suitable for treating normally consolidated silt, mucky soil, plain filling soil, soft plastic or plastic cohesive soil, silt, various sandy soil and saturated loess soil layers.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the construction process of a high-pressure air-disturbed cement-soil mixing pile according to the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in the figure, the construction process of the high-pressure air-disturbed cement-soil mixing pile comprises the following steps:
s1, preparation for construction
Before construction, leveling a tamping field, and introducing a measurement control net; collecting geological data, researching and analyzing a geological survey report and a design drawing, and analyzing and counting the stratum range influencing the normal construction of the mixing pile; carrying out a process test to determine construction control parameters of the mixing pile;
s2, measuring and lofting, and excavating groove
Lofting the position of the mixing pile according to a design drawing, excavating a groove along the central line by using an excavator according to the central line of the mixing pile at the lofting position, and synchronously removing earth surface and underground obstacles in the excavation process;
s3, transporting the drilling machine to a site to be constructed, positioning and centering according to the set pile position, connecting a high-pressure cement slurry pump and an air compressor, preparing cement slurry in a slurry barrel, and providing the cement slurry to a high-pressure water slurry pump;
s4, stirring and sinking: starting a drilling machine motor, loosening a steel wire rope of a jack, enabling a drill rod to drive a stirring blade to cut soil and sink according to a designed rotating speed, starting a cement slurry pump and an air compressor when the drill rod sinks, pumping cement slurry and high-pressure gas according to a designed pressure, enabling a soil body to be mixed with the sprayed cement slurry under the disturbance of the stirring blade and high-pressure gas flow, rotating while spraying, and sinking the drill rod strictly according to a sinking speed determined by design;
s5, stirring and lifting: after the drill rod sinks to the designed depth, continuously spraying and injecting the slurry and rotating the drill rod according to the design requirement, and simultaneously lifting the drill rod to the elevation of the pile top strictly according to the lifting speed determined by the design;
s6, repeating up-down stirring: the stirring times are determined strictly according to each design, and the stirring is repeated up and down under the condition of keeping the spraying and air injection states;
and S7, turning off the drilling machine, shifting the whole machine to the designated pile position of the next pile, and repeating the above steps to finish the next mixing pile.
Wherein the grade of the cement is not less than 32.5, and the water-cement ratio of the slurry is 0.5-0.6. The cement mixing amount of the reinforcement is 12-20%, and the working pressure of a cement slurry pump is not less than 5.0 MPa. The working pressure of the air compressor is 0.7 MPa. Stirring, sinking and raising speed of 0.5-0.8 m/min.
The lifting and sinking speed V in the process of guniting and air injection is calculated according to the following formula:
in the formula: v, the guniting lifting speed (m/min) of the stirring head;
gamma d and gamma are the gravities (KN/m) of cement paste and soil respectively3)；
Discharge capacity (m) of Q cement slurry pump3/min)；
Alpha w cement mixing ratio;
the water cement ratio of the cement paste is alpha c;
cross sectional area (m) of F-shaped mixing pile2)。
The number of stirring times N per pass was calculated by the following formula:
in the formula: h width (m) of the stirring blade;
the vertical included angle (DEG) between the beta stirring blade and the stirring shaft;
the total number of sigma Z stirring blades;
n number of revolutions of the stirring head (rev/min);
v the lifting speed (m/min) of the stirring head.
Therefore, the construction process of the high-pressure air disturbance cement soil mixing pile with the structure is adopted, the high-pressure air disturbance mixing soil layer is increased, and the cement slurry and the original soil layer are mixed more uniformly under the combined action of mechanical mixing and high-pressure air flow.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (7)
1. A high-pressure air-disturbed cement-soil mixing pile construction process is characterized by comprising the following steps:
s1, preparation for construction
Before construction, leveling a tamping field, and introducing a measurement control net; collecting geological data, researching and analyzing a geological survey report and a design drawing, and analyzing and counting the stratum range influencing the normal construction of the mixing pile; carrying out a process test to determine construction control parameters of the mixing pile;
s2, measuring and lofting, and excavating groove
Lofting the position of the mixing pile according to a design drawing, excavating a groove along the central line by using an excavator according to the central line of the mixing pile at the lofting position, and synchronously removing earth surface and underground obstacles in the excavation process;
s3, transporting the drilling machine to a site to be constructed, positioning and centering according to the set pile position, connecting a high-pressure cement slurry pump and an air compressor, preparing cement slurry in a slurry barrel, and providing the cement slurry to a high-pressure water slurry pump;
s4, stirring and sinking: starting a drilling machine motor, loosening a steel wire rope of a jack, enabling a drill rod to drive a stirring blade to cut soil and sink according to a designed rotating speed, starting a cement slurry pump and an air compressor when the drill rod sinks, pumping cement slurry and high-pressure gas according to a designed pressure, enabling a soil body to be mixed with the sprayed cement slurry under the disturbance of the stirring blade and high-pressure gas flow, rotating while spraying, and sinking the drill rod strictly according to a sinking speed determined by design;
s5, stirring and lifting: after the drill rod sinks to the designed depth, continuously spraying and injecting the slurry and rotating the drill rod according to the design requirement, and simultaneously lifting the drill rod to the elevation of the pile top strictly according to the lifting speed determined by the design;
s6, repeating up-down stirring: the stirring times are determined strictly according to each design, and the stirring is repeated up and down under the condition of keeping the spraying and air injection states;
and S7, turning off the drilling machine, shifting the whole machine to the designated pile position of the next pile, and repeating the above steps to finish the next mixing pile.
2. The construction process of the high-pressure air-disturbed cement-soil mixing pile according to claim 1, wherein the lifting and sinking speeds V in the process of guniting and air-jetting are calculated according to the following formula:
in the formula: v, the guniting lifting speed (m/min) of the stirring head;
gamma d and gamma are the gravities (KN/m) of cement paste and soil respectively3)；
Discharge capacity (m) of Q cement slurry pump3/min)；
Alpha w cement mixing ratio;
the water cement ratio of the cement paste is alpha c;
cross sectional area (m) of F-shaped mixing pile2)。
3. The process of claim 2, wherein the number of times N of stirring per time is calculated by the following formula:
in the formula: h width (m) of the stirring blade;
the vertical included angle (DEG) between the beta stirring blade and the stirring shaft;
the total number of sigma Z stirring blades;
n number of revolutions of the stirring head (rev/min);
v the lifting speed (m/min) of the stirring head.
4. The high-pressure air-disturbed cement-soil mixing pile construction process according to claim 1, characterized in that: the grade of the cement is not less than 32.5, and the water-cement ratio of the slurry is 0.5-0.6.
5. The high-pressure air-disturbed cement-soil mixing pile construction process according to claim 1, characterized in that: the cement mixing amount of the reinforcement is 12-20%, and the working pressure of a cement slurry pump is not less than 5.0 MPa.
6. The high-pressure air-disturbed cement-soil mixing pile construction process according to claim 1, characterized in that: the working pressure of the air compressor is 0.7 MPa.
7. The high-pressure air-disturbed cement-soil mixing pile construction process according to claim 1, characterized in that: stirring, sinking and raising speed of 0.5-0.8 m/min.
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114351702A (en) * | 2022-01-29 | 2022-04-15 | 上海公路桥梁（集团）有限公司 | Preparation process of multi-liquid composite micro-disturbance stirring pile |
| CN114908740A (en) * | 2022-04-29 | 2022-08-16 | 天津建工城市建设发展有限公司 | Operation method of mixing pile |
| CN117404016A (en) * | 2023-10-31 | 2024-01-16 | 河北省水利工程局集团有限公司 | Construction method of drilling device for multiple cement-soil mixing piles |
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| CN1737269A (en) * | 2005-09-07 | 2006-02-22 | 广州市天铖建筑技术有限公司 | Technique for spraying and stirring pile |
| CN103556631A (en) * | 2013-11-18 | 2014-02-05 | 高伯明 | Pile-forming operation method for stirring pile |
| CN104631446A (en) * | 2015-01-14 | 2015-05-20 | 中交天津港湾工程研究院有限公司 | Technical method for improving quality of deep cement soil mixing piles using compressed air foam |
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| CN111178741A (en) * | 2019-12-25 | 2020-05-19 | 德清县杭绕高速有限公司 | Mixing pile quality evaluation method based on construction remote monitoring system |
-
2020
- 2020-11-03 CN CN202011210437.XA patent/CN112281827A/en active Pending
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| JPH09279566A (en) * | 1996-04-10 | 1997-10-28 | Kazuo Iki | High pressure jet-agitating pile construction method and device therefor |
| CN1737269A (en) * | 2005-09-07 | 2006-02-22 | 广州市天铖建筑技术有限公司 | Technique for spraying and stirring pile |
| CN103556631A (en) * | 2013-11-18 | 2014-02-05 | 高伯明 | Pile-forming operation method for stirring pile |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114351702A (en) * | 2022-01-29 | 2022-04-15 | 上海公路桥梁（集团）有限公司 | Preparation process of multi-liquid composite micro-disturbance stirring pile |
| CN114908740A (en) * | 2022-04-29 | 2022-08-16 | 天津建工城市建设发展有限公司 | Operation method of mixing pile |
| CN117404016A (en) * | 2023-10-31 | 2024-01-16 | 河北省水利工程局集团有限公司 | Construction method of drilling device for multiple cement-soil mixing piles |
| CN117404016B (en) * | 2023-10-31 | 2024-03-19 | 河北省水利工程局集团有限公司 | Construction method of drilling device for multiple cement-soil mixing piles |
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