CN112796311A - Construction method for high-speed deep stirring - Google Patents
Construction method for high-speed deep stirring Download PDFInfo
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- CN112796311A CN112796311A CN202010858152.0A CN202010858152A CN112796311A CN 112796311 A CN112796311 A CN 112796311A CN 202010858152 A CN202010858152 A CN 202010858152A CN 112796311 A CN112796311 A CN 112796311A
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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
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Abstract
The invention discloses a construction method of high-speed deep stirring, belonging to the technical engineering field of pile foundations, which combines a solidified material conveying module, a solidified material slurry preparation module, a resistance reducing material preparation module, a defoaming material preparation module and a drilling machine, and realizes the construction method of large-diameter deep layer by the following steps: preparing stirring construction; stirring and drilling construction; performing secondary stirring construction on the pile bottom; stirring and lifting the drill; and when the stirring drill bit is lifted to the ground, the stirring operation is completed, and the construction is finished. In the invention, resistance in the drilling process is reduced by adopting resistance reducing material bubbles in the drilling process, defoaming materials are added in the drilling process, the mixing amount and mixing form of the curing materials in the drilling process and the drilling process are changed, and the rotating speed in the drilling process and the drilling process is changed, so that the construction of the deep mixing pile is realized.
Description
Technical Field
The invention relates to the technical field of pile foundation engineering, in particular to a construction method for high-speed deep stirring.
Background
With the rapid development of urban construction in China, land resources are more and more tense, underground spaces are fully developed and utilized, and the method is a necessary trend of urban construction development. The urban underground space is developing towards a larger depth and a larger scale, and the large-scale investment and planning cause underground engineering construction to face more challenges and problems. The deep stirring method is from the United states early, introduced to Japan after the second war and applied to industrial and civil construction engineering, ports, highway and railway roadbed reinforcement by the development of Japan, and introduced to China later in the 70 s.
The cement reinforcing method for treating soft foundation has been popularized and used in China for many years, and can utilize original foundation soil to the maximum extent. A large number of engineering practices prove that the cement reinforcing method is an effective foundation treatment method which has wide application engineering range and is economical and reasonable. The existing deep stirring method is mainly to adopt a deep stirrer for construction, cement, lime and other materials are used as curing agents, a low-pressure slurry pump is used for pumping curing slurry to the deep part of a foundation, and soft soil and the curing agents are directly and forcibly mixed through stirring blades to form a reinforcement body with higher strength. However, the existing deep mixing pile cannot achieve the effect of ultra-deep mixing because the higher the drilling depth is, the larger the mixing resistance is, and the worse the mixing effect is, the development of ultra-deep foundation pit support and pile foundation is restricted, so that a novel construction mixing method is urgently needed.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a construction method for high-speed deep stirring, which overcomes the defects in the prior art. Resistance in the drilling process is reduced by adopting resistance reducing material bubbles in the drilling process, so that low-torque construction under the condition of an ultra-deep stratum is realized; the defoaming material is added in the drill lifting process to eliminate the bubbles of the resistance reducing material, so that the strength of the cement soil is greatly improved; by changing the mixing amount and the mixing form of the solidified material in the drilling process and changing the rotating speed in the drilling process and the drilling process, the deep soil body and the solidified material are uniformly mixed, and the overall strength of the stirring pile is increased.
In order to achieve the purpose, the invention adopts the following technical scheme:
a construction method for high-speed deep stirring is characterized in that a solidified material conveying module, a solidified material slurry preparation module, a resistance reducing material preparation module, a defoaming material preparation module and a drilling machine are combined, and the construction method for the large-diameter deep layer is realized by the following steps:
step 1: preparation for stirring construction
Leveling a field, determining the position of a drilling machine, and checking the perpendicularity of a pile frame; respectively connecting a solidified material conveying module, a solidified material slurry preparation module, a resistance reducing material preparation module and a defoaming material preparation module with a drilling machine through high-pressure rubber pipes; preparing a solidified material slurry from a solidified material required by drilling down and water in a solidified material slurry preparation module, putting the solidified material required by drilling up into a solidified material conveying module for later use, mixing and stirring a resistance reducing material and water in the resistance reducing material preparation module to form micro bubbles, and mixing a defoaming material and water in a defoaming material preparation module to form a defoaming solvent;
step 2: stirring and drilling construction
In the process of stirring and drilling, simultaneously spraying curing material slurry and resistance reducing material bubbles, wherein the curing material slurry is sprayed out from the back of a stirring blade at the lowest end of a stirring drill bit, the resistance reducing material bubbles are sprayed out from the front of the stirring blade at the lowest end of the stirring drill bit, the concentration of the curing material slurry is controlled according to the natural water content of a soil layer, the spraying amount of the resistance reducing material bubbles is controlled according to torque, the spraying position of the resistance reducing material is positioned at the lower part of the spraying position of the curing material, the generation amount of the resistance reducing material bubbles is in direct proportion to the concentration of a resistance reducing material solution, wherein the concentration of the initial curing material slurry is a, the concentration of the initial resistance reducing material solution is b, the normal working torque value is N1, the limit working torque value is N2, the doping amount of the curing material in the whole pile is 10% -40% of the mass of the soil body, and the doping amount of the curing material in the drilling process, the concrete adjustment measures of the ejection flow of the curing material slurry are as follows:
(1) when the natural water content of the soil layer is less than w1, the concentration range of the solidified material slurry is 1.2 a-2.0 a;
(2) when the natural water content of the soil layer is between w1 and w2, the concentration range of the curing material slurry is 0.8a to 1.2 a;
(3) when the natural water content of the soil layer is more than w2, the concentration range of the solidified material slurry is 0.4 a-0.8 a;
the doping amount of the resistance reducing material in the whole pile is 0.1-5% of the mass of the soil body, the resistance reducing material is completely consumed in the drilling process, and the specific adjustment measures of the concentration of the resistance reducing material are as follows:
(1) when the torque of the drilling machine is less than N1, no resistance reducing material bubbles are sprayed;
(2) when the torque of the drilling machine is between N1 and N2, the concentration range of the resistance reducing material slurry is 0.1 to 5 percent;
(3) when the torque of the drilling machine is larger than N2, the concentration range of the resistance reducing material slurry is 5% -20%;
(4) when the depth is within the range of 3 m-5 m above the designed depth, stopping jetting the bubbles of the resistance reducing material;
and step 3: pile bottom re-stirring construction
When the drilling depth reaches the design value, stirring in situ for 1-2 min, then lifting and stirring at the speed of 0.8-1.5 m/min for 3-5 m, and then drilling and stirring to the design depth;
and 4, step 4: stirring drill lifting construction
The method comprises the following steps that high-pressure gas is adopted in the drill lifting process to spray solidified materials, spraying of resistance reducing materials and solidified material slurry is stopped in the stirring drill lifting process, the solidified materials and defoaming materials are sprayed, the solidified materials are sprayed from the back of a stirring blade at the uppermost end of a stirring drill bit, defoaming material bubbles are sprayed from the front of the stirring blade at the uppermost end of the stirring drill bit, the doping amount of the solidified materials in the drill lifting process is 50% -100% of the mass of all the solidified materials, the doping amount of the defoaming materials is 0.1% -5% of the mass of a soil body, the defoaming materials are completely consumed in the drill lifting process, the solidified materials are conveyed into the surrounding soil body through the high-pressure gas, the pressure range of the high-pressure gas is 0.5-3.0 MPa, the pressure value of the high-pressure gas is increased along with the: the spraying amount of the defoaming material at the same depth position is in direct proportion to the spraying amount of the resistance reducing material in the drilling process;
and 5: and when the stirring drill bit is lifted to the ground, the stirring operation is completed, and the construction is finished.
Preferably, the field leveling main measures in step 1 are as follows: removing surface layer obstacles in a construction area, backfilling a proper amount of gravels and tamping, and paving a roadbed if necessary, wherein the bearing load of the roadbed is based on the heavy pile frame capable of walking; the concrete measures of the drill for positioning and adjusting the verticality are as follows: the drilling machine chassis is adjusted by combining the condition of a construction site, so that the chassis is parallel to or perpendicular to a designed pile line, a drill bit is coincided with the central point of a designed pile position, a line hammer is used for positioning and observing the stand column to ensure the perpendicularity of the pile body of the pile machine, 2 theodolites are adopted to check the perpendicularity of the pile frame in the vertical direction, the positioning deviation is ensured to be not more than 10mm, and the perpendicularity is not more than 1/200.
Preferably, in the step 1, the resistance reducing material is selected from an ionic surfactant solution, the type of the ionic surfactant solution is sodium dodecyl sulfate or sodium dodecyl benzene sulfonate, and the resistance reducing material is prepared into micron-sized bubbles through a resistance reducing material preparation module, wherein the diameter range of the micron-sized bubbles is 1-100 microns; the curing material is ordinary portland cement, the slurry of the curing material is pumped into the high-pressure rubber tube through the grouting pump, the bubbles of the resistance reducing material are conveyed to the high-pressure rubber tube through the air press, the defoaming solvent is pumped into the high-pressure rubber tube through the grouting pump, and the curing material is conveyed to the high-pressure rubber tube through the air press.
Preferably, in the step 2, the concentration a of the initial curing material slurry ranges from 0 to 80%, the concentration b of the initial resistance reducing material ranges from 0 to 20%, the normal working torque value N1 ranges from 30000N.m, the limit working torque value N2 ranges from 50000N.m, when the drill bit enters 0.2m to 0.5m below the ground, the resistance reducing material and the curing material slurry start to be sprayed, the drilling speed ranges from 0.4 m/min to 1.0m/min, and the rotating speed ranges from 5r/min to 20 r/min.
Preferably, the drilling speed in the step 4 is 0.5m/min to 2.5m/min, the rotating speed is 5r/min to 30r/min, in addition, the conveying speed of the curing material is not influenced by the size of the air pressure, and the conveying speed of the curing material is 100Kg/min to 300 Kg/min.
Preferably, the specific relationship between the pressure value of the high pressure gas and the drill bit depth in step 4 is as follows:
(1) when the depth of the drill bit is less than 10m, the air pressure is 0-0.5 MPa;
(2) when the depth of the drill bit is within the range of 10 m-20 m, the air pressure is 0.5 MPa-1.0 MPa;
(3) when the depth of the drill bit is within the range of 20m to 30m, the air pressure is 0.5MPa to 1.5 MPa;
(4) when the depth of the drill bit is larger than 30m, the air pressure is 1.0 MPa-2.0 MPa.
Preferably, the defoaming material is liquid, powder or solid particles, and the defoaming material includes but is not limited to polysiloxane, polyether modified silicone oil, polydimethylsiloxane, polyoxyethylene polyoxypropylene ether.
The invention has the following beneficial technical effects:
(1) resistance in the drilling process is reduced by adopting resistance reducing material bubbles in the drilling process, so that low-torque construction under the condition of an ultra-deep stratum is realized; (2) the defoaming material is added in the drill lifting process to eliminate the bubbles of the resistance reducing material, so that the strength of the cement soil is greatly improved; (3) by changing the mixing amount and the mixing form of the solidified material in the drilling process and changing the rotating speed in the drilling process and the drilling process, the deep soil body and the solidified material are uniformly mixed, and the overall strength of the stirring pile is increased.
Drawings
FIG. 1 is a schematic view of the construction process of the high-speed deep mixing construction method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
example 1:
ordinary portland cement is used as a curing material, the pile forming depth is 40m, and the defoaming material is in a powder state, and stirring construction is carried out.
As shown in fig. 1, a construction method of high-speed deep stirring is characterized in that a solidified material conveying module, a solidified material slurry preparation module, a resistance reducing material preparation module, a defoaming material preparation module and a drilling machine are combined, and the construction method of large-diameter deep layer is realized by the following steps:
step 1: preparation for stirring construction
Leveling a field, determining the position of a drilling machine, and checking the perpendicularity of a pile frame; respectively connecting a solidified material conveying module, a solidified material slurry preparation module, a resistance reducing material preparation module and a defoaming material preparation module with a drilling machine through high-pressure rubber pipes; preparing a solidified material slurry from a solidified material required by drilling down and water in a solidified material slurry preparation module, putting the solidified material required by drilling up into a solidified material conveying module for later use, mixing and stirring a resistance reducing material and water in the resistance reducing material preparation module to form micro bubbles, and mixing a defoaming material and water in a defoaming material preparation module to form a defoaming solvent;
step 2: stirring and drilling construction
In the process of stirring and drilling, simultaneously spraying curing material slurry and resistance reducing material bubbles, wherein the curing material slurry is sprayed out from the back of a stirring blade at the lowest end of a stirring drill bit, the resistance reducing material bubbles are sprayed out from the front of the stirring blade at the lowest end of the stirring drill bit, the concentration of the curing material slurry is controlled according to the natural water content of a soil layer, the spraying amount of the resistance reducing material bubbles is controlled according to torque, the spraying position of the resistance reducing material is positioned at the lower part of the spraying position of the curing material, the generation amount of the resistance reducing material bubbles is in direct proportion to the concentration of a resistance reducing material solution, wherein the concentration of the initial curing material slurry is a, the concentration of the initial resistance reducing material solution is b, the normal working torque value is N1, the limit working torque value is N2, the doping amount of the curing material in the whole pile is 30% of the mass of the soil body, and the doping amount of the curing material in, the concrete adjustment measures of the ejection flow of the curing material slurry are as follows:
(1) when the natural water content of the soil layer is less than w1, the concentration of the solidified material slurry is 1.5 a;
(2) when the natural water content of the soil layer is between w 1-w 2, the concentration range of the curing material slurry is 1.0 a;
(3) when the natural water content of the soil layer is more than w2, the concentration range of the solidified material slurry is 0.7 a;
the doping amount of the resistance reducing material in the whole pile is 3% of the mass of the soil body, the resistance reducing material is completely consumed in the drilling process, and the specific adjustment measures of the concentration of the resistance reducing material are as follows:
(1) when the torque of the drilling machine is less than N1, no resistance reducing material bubbles are sprayed;
(2) when the torque of the drilling machine is between N1 and N2, the concentration range of the resistance reducing material slurry is 2 percent;
(3) when the torque of the drilling machine is larger than N2, the concentration range of the resistance reducing material slurry is 7%;
(4) when the depth is within the range of 3 m-5 m above the designed depth, stopping jetting the bubbles of the resistance reducing material;
and step 3: pile bottom re-stirring construction
When the drilling depth reaches a design value, stirring in situ for 1-2 min, then lifting and stirring at the speed of 1.0m/min for 4m, and then drilling and stirring to the design depth;
and 4, step 4: stirring drill lifting construction
The method comprises the following steps that high-pressure gas is adopted in the drilling lifting process to spray solidified materials, the spraying of resistance reducing materials and solidified material slurry is stopped in the stirring drilling lifting process, the solidified materials and defoaming materials are sprayed, the solidified materials are sprayed from the back of a stirring blade at the uppermost end of a stirring drill bit, defoaming material bubbles are sprayed from the front of the stirring blade at the uppermost end of the stirring drill bit, the doping amount of the solidified materials in the drilling lifting process is 70% of the mass of all the solidified materials, the doping amount of the defoaming materials is 3% of the mass of a soil body, the defoaming materials are completely consumed in the drilling lifting process, the solidified materials are conveyed into the surrounding soil body through high-pressure gas, the pressure range of the high-pressure gas is 0.5-3.0 MPa, the pressure value of the high-pressure gas is increased along with: the spraying amount of the defoaming material at the same depth position is in direct proportion to the spraying amount of the resistance reducing material in the drilling process;
and 5: and when the stirring drill bit is lifted to the ground, the stirring operation is completed, and the construction is finished.
Preferably, the field leveling main measures in step 1 are as follows: removing surface layer obstacles in a construction area, backfilling a proper amount of gravels and tamping, and paving a roadbed if necessary, wherein the bearing load of the roadbed is based on the heavy pile frame capable of walking; the concrete measures of the drill for positioning and adjusting the verticality are as follows: the drilling machine chassis is adjusted by combining the condition of a construction site, so that the chassis is parallel to or perpendicular to a designed pile line, a drill bit is coincided with the central point of a designed pile position, a line hammer is used for positioning and observing the stand column to ensure the perpendicularity of the pile body of the pile machine, 2 theodolites are adopted to check the perpendicularity of the pile frame in the vertical direction, the positioning deviation is ensured to be not more than 10mm, and the perpendicularity is not more than 1/200.
Preferably, in the step 1, the resistance reducing material is selected from an ionic surfactant solution, the type of the ionic surfactant solution is sodium dodecyl sulfate or sodium dodecyl benzene sulfonate, and the resistance reducing material is prepared into micron-sized bubbles through a resistance reducing material preparation module, wherein the diameter range of the micron-sized bubbles is 10-50 microns; the curing material is ordinary portland cement, the slurry of the curing material is pumped into the high-pressure rubber tube through the grouting pump, the bubbles of the resistance reducing material are conveyed to the high-pressure rubber tube through the air press, the defoaming solvent is pumped into the high-pressure rubber tube through the grouting pump, and the curing material is conveyed to the high-pressure rubber tube through the air press.
Preferably, the concentration a of the initial solidified material slurry in the step 2 is 70%, the concentration b of the initial resistance reducing material is 10%, the normal working torque value N1 is 30000N.m, the limit working torque value N2 is 50000N.m, when the drill bit enters 0.5m below the ground, the resistance reducing material and the solidified material slurry are started to be sprayed, the drilling speed is 0.6m/min, and the rotating speed is 15 r/min.
Preferably, the drilling speed in the step 4 is 1.5m/min, the rotating speed is 25r/min, in addition, the conveying speed of the solidified material is not influenced by the size of the air pressure, and the conveying speed of the solidified material is 120 Kg/min.
Preferably, the specific relationship between the pressure value of the high pressure gas and the drill bit depth in step 4 is as follows:
(1) when the depth of the drill bit is less than 10m, the air pressure is 0.3 MPa;
(2) when the depth of the drill bit is within the range of 10 m-20 m, the air pressure is 0.7 MPa;
(3) when the depth of the drill bit is within the range of 20 m-30 m, the air pressure is 1.2 MPa;
(4) when the depth of the drill bit is more than 30m, the air pressure is 1.5 MPa.
Example 2:
ordinary portland cement is used as a curing material, the pile forming depth is 50m, and the defoaming material is in a liquid state, and stirring construction is carried out.
As shown in fig. 1, a construction method of high-speed deep stirring is characterized in that a solidified material conveying module, a solidified material slurry preparation module, a resistance reducing material preparation module, a defoaming material preparation module and a drilling machine are combined, and the construction method of large-diameter deep layer is realized by the following steps:
step 1: preparation for stirring construction
Leveling a field, determining the position of a drilling machine, and checking the perpendicularity of a pile frame; respectively connecting a solidified material conveying module, a solidified material slurry preparation module, a resistance reducing material preparation module and a defoaming material preparation module with a drilling machine through high-pressure rubber pipes; preparing a solidified material slurry from a solidified material required by drilling down and water in a solidified material slurry preparation module, putting the solidified material required by drilling up into a solidified material conveying module for later use, mixing and stirring a resistance reducing material and water in the resistance reducing material preparation module to form micro bubbles, and mixing a defoaming material and water in a defoaming material preparation module to form a defoaming solvent;
step 2: stirring and drilling construction
In the process of stirring and drilling, simultaneously spraying curing material slurry and resistance reducing material bubbles, wherein the curing material slurry is sprayed out from the back of a stirring blade at the lowest end of a stirring drill bit, the resistance reducing material bubbles are sprayed out from the front of the stirring blade at the lowest end of the stirring drill bit, the concentration of the curing material slurry is controlled according to the natural water content of a soil layer, the spraying amount of the resistance reducing material bubbles is controlled according to torque, the spraying position of the resistance reducing material is positioned at the lower part of the spraying position of the curing material, the generation amount of the resistance reducing material bubbles is in direct proportion to the concentration of a resistance reducing material solution, wherein the concentration of the initial curing material slurry is a, the concentration of the initial resistance reducing material solution is b, the normal working torque value is N1, the limit working torque value is N2, the doping amount of the curing material in the whole pile is 30% of the mass of the soil body, and the doping amount of the curing material in, the concrete adjustment measures of the ejection flow of the curing material slurry are as follows:
(1) when the natural water content of the soil layer is less than w1, the concentration range of the solidified material slurry is 1.5 a;
(2) when the natural water content of the soil layer is between w 1-w 2, the concentration range of the curing material slurry is 1.0 a;
(3) when the natural water content of the soil layer is more than w2, the concentration range of the solidified material slurry is 0.6 a;
the doping amount of the resistance reducing material in the whole pile is 4% of the mass of the soil body, the resistance reducing material is completely consumed in the drilling process, and the specific adjustment measures of the concentration of the resistance reducing material are as follows:
(1) when the torque of the drilling machine is less than N1, no resistance reducing material bubbles are sprayed;
(2) when the torque of the drilling machine is between N1 and N2, the concentration range of the resistance reducing material slurry is 3 percent;
(3) when the torque of the drilling machine is larger than N2, the concentration range of the resistance reducing material slurry is 8%;
(4) when the depth is within the range of 3 m-5 m above the designed depth, stopping jetting the bubbles of the resistance reducing material;
and step 3: pile bottom re-stirring construction
When the drilling depth reaches the design value, stirring in situ for 1-2 min, then lifting and stirring at the speed of 0.8-1.5 m/min for 3-5 m, and then drilling and stirring to the design depth;
and 4, step 4: stirring drill lifting construction
The method comprises the following steps that high-pressure gas is adopted in the drilling lifting process to spray solidified materials, the spraying of resistance reducing materials and solidified material slurry is stopped in the stirring drilling lifting process, the solidified materials and defoaming materials are sprayed, the solidified materials are sprayed from the back of a stirring blade at the uppermost end of a stirring drill bit, defoaming material bubbles are sprayed from the front of the stirring blade at the uppermost end of the stirring drill bit, the doping amount of the solidified materials in the drilling lifting process is 60% of the mass of all the solidified materials, the doping amount of the defoaming materials is 4% of the mass of a soil body, the defoaming materials are completely consumed in the drilling lifting process, the solidified materials are conveyed into the surrounding soil body through high-pressure gas, the pressure range of the high-pressure gas is 0.5-3.0 MPa, the pressure value of the high-pressure gas is increased along with: the spraying amount of the defoaming material at the same depth position is in direct proportion to the spraying amount of the resistance reducing material in the drilling process;
and 5: and when the stirring drill bit is lifted to the ground, the stirring operation is completed, and the construction is finished.
Preferably, the field leveling main measures in step 1 are as follows: removing surface layer obstacles in a construction area, backfilling a proper amount of gravels and tamping, and paving a roadbed if necessary, wherein the bearing load of the roadbed is based on the heavy pile frame capable of walking; the concrete measures of the drill for positioning and adjusting the verticality are as follows: the drilling machine chassis is adjusted by combining the condition of a construction site, so that the chassis is parallel to or perpendicular to a designed pile line, a drill bit is coincided with the central point of a designed pile position, a line hammer is used for positioning and observing the stand column to ensure the perpendicularity of the pile body of the pile machine, 2 theodolites are adopted to check the perpendicularity of the pile frame in the vertical direction, the positioning deviation is ensured to be not more than 10mm, and the perpendicularity is not more than 1/200.
Preferably, in the step 1, the resistance reducing material is selected from an ionic surfactant solution, the type of the ionic surfactant solution is sodium dodecyl sulfate or sodium dodecyl benzene sulfonate, and the resistance reducing material is prepared into micron-sized bubbles through a resistance reducing material preparation module, wherein the diameter range of the micron-sized bubbles is 10-30 microns; the curing material is ordinary portland cement, the slurry of the curing material is pumped into the high-pressure rubber tube through the grouting pump, the bubbles of the resistance reducing material are conveyed to the high-pressure rubber tube through the air press, the defoaming solvent is pumped into the high-pressure rubber tube through the grouting pump, and the curing material is conveyed to the high-pressure rubber tube through the air press.
Preferably, in the step 2, the concentration a of the initial solidified material slurry is 80%, the concentration b of the initial resistance reducing material is 8%, the normal working torque value N1 is 30000N.m, the limit working torque value N2 is 50000N.m, when the drill bit enters 0.2m below the ground, the resistance reducing material and the solidified material slurry are started to be sprayed, the drilling speed is 0.5m/min, and the rotating speed is 20 r/min.
Preferably, the drilling speed in the step 4 is 1.0m/min, the rotating speed is 30r/min, in addition, the conveying speed of the solidified material is not influenced by the size of the air pressure, and the conveying speed of the solidified material is 150 Kg/min.
Preferably, the specific relationship between the pressure value of the high pressure gas and the drill bit depth in step 4 is as follows:
(1) when the depth of the drill bit is less than 10m, the air pressure is 0.4 MPa;
(2) when the depth of the drill bit is within the range of 10 m-20 m, the air pressure is 0.9 MPa;
(3) when the depth of the drill bit is within the range of 20 m-30 m, the air pressure is 1.2 MPa;
(4) when the depth of the drill bit is more than 30m, the air pressure is 1.6 MPa.
Preferably, the defoaming material is HFT-800.
According to the construction method of high-speed deep stirring, resistance in the drilling process is reduced by adopting resistance reducing material bubbles in the drilling process, and low-torque construction under the condition of an ultra-deep stratum is realized; the defoaming material is added in the drill lifting process to eliminate the bubbles of the resistance reducing material, so that the strength of the cement soil is greatly improved; by changing the mixing amount and the mixing form of the solidified material in the drilling process and changing the rotating speed in the drilling process and the drilling process, the deep soil body and the solidified material are uniformly mixed, and the overall strength of the stirring pile is increased.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (7)
1. A construction method for high-speed deep stirring is characterized in that a solidified material conveying module, a solidified material slurry preparation module, a resistance reducing material preparation module, a defoaming material preparation module and a drilling machine are combined, and the construction method for the large-diameter deep layer is realized by the following steps:
step 1: preparation for stirring construction
Leveling a field, determining the position of a drilling machine, and checking the perpendicularity of a pile frame; respectively connecting a solidified material conveying module, a solidified material slurry preparation module, a resistance reducing material preparation module and a defoaming material preparation module with a drilling machine through high-pressure rubber pipes; preparing a solidified material slurry from a solidified material required by drilling down and water in a solidified material slurry preparation module, putting the solidified material required by drilling up into a solidified material conveying module for later use, mixing and stirring a resistance reducing material and water in the resistance reducing material preparation module to form micro bubbles, and mixing a defoaming material and water in a defoaming material preparation module to form a defoaming solvent;
step 2: stirring and drilling construction
In the process of stirring and drilling, simultaneously spraying curing material slurry and resistance reducing material bubbles, wherein the curing material slurry is sprayed out from the back of a stirring blade at the lowest end of a stirring drill bit, the resistance reducing material bubbles are sprayed out from the front of the stirring blade at the lowest end of the stirring drill bit, the concentration of the curing material slurry is controlled according to the natural water content of a soil layer, the spraying amount of the resistance reducing material bubbles is controlled according to torque, the spraying position of the resistance reducing material is positioned at the lower part of the spraying position of the curing material, the generation amount of the resistance reducing material bubbles is in direct proportion to the concentration of a resistance reducing material solution, wherein the concentration of the initial curing material slurry is a, the concentration of the initial resistance reducing material solution is b, the normal working torque value is N1, the limit working torque value is N2, the doping amount of the curing material in the whole pile is 10% -40% of the mass of the soil body, and the doping amount of the curing material in the drilling process, the concrete adjustment measures of the ejection flow of the curing material slurry are as follows:
(1) when the natural water content of the soil layer is less than w1, the concentration range of the solidified material slurry is 1.2 a-2.0 a;
(2) when the natural water content of the soil layer is between w1 and w2, the concentration range of the curing material slurry is 0.8a to 1.2 a;
(3) when the natural water content of the soil layer is more than w2, the concentration range of the solidified material slurry is 0.4 a-0.8 a;
the doping amount of the resistance reducing material in the whole pile is 0.1-5% of the mass of the soil body, the resistance reducing material is completely consumed in the drilling process, and the specific adjustment measures of the concentration of the resistance reducing material are as follows:
(1) when the torque of the drilling machine is less than N1, no resistance reducing material bubbles are sprayed;
(2) when the torque of the drilling machine is between N1 and N2, the concentration range of the resistance reducing material slurry is 0.1 to 5 percent;
(3) when the torque of the drilling machine is larger than N2, the concentration range of the resistance reducing material slurry is 5% -20%;
(4) when the depth is within the range of 3 m-5 m above the designed depth, stopping jetting the bubbles of the resistance reducing material;
and step 3: pile bottom re-stirring construction
When the drilling depth reaches the design value, stirring in situ for 1-2 min, then lifting and stirring at the speed of 0.8-1.5 m/min for 3-5 m, and then drilling and stirring to the design depth;
and 4, step 4: stirring drill lifting construction
The method comprises the following steps that high-pressure gas is adopted in the drill lifting process to spray solidified materials, spraying of resistance reducing materials and solidified material slurry is stopped in the stirring drill lifting process, the solidified materials and defoaming materials are sprayed, the solidified materials are sprayed from the back of a stirring blade at the uppermost end of a stirring drill bit, defoaming material bubbles are sprayed from the front of the stirring blade at the uppermost end of the stirring drill bit, the doping amount of the solidified materials in the drill lifting process is 50% -100% of the mass of all the solidified materials, the doping amount of the defoaming materials is 0.1% -5% of the mass of a soil body, the defoaming materials are completely consumed in the drill lifting process, the solidified materials are conveyed into the surrounding soil body through the high-pressure gas, the pressure range of the high-pressure gas is 0.5-3.0 MPa, the pressure value of the high-pressure gas is increased along with the: the spraying amount of the defoaming material at the same depth position is in direct proportion to the spraying amount of the resistance reducing material in the drilling process;
and 5: and when the stirring drill bit is lifted to the ground, the stirring operation is completed, and the construction is finished.
2. The construction method of high-speed deep stirring as claimed in claim 1, wherein the main measures of field leveling in step 1 are as follows: removing surface layer obstacles in a construction area, backfilling a proper amount of gravels and tamping, and paving a roadbed if necessary, wherein the bearing load of the roadbed is based on the heavy pile frame capable of walking; the concrete measures of the drill for positioning and adjusting the verticality are as follows: the drilling machine chassis is adjusted by combining the condition of a construction site, so that the chassis is parallel to or perpendicular to a designed pile line, a drill bit is coincided with the central point of a designed pile position, a line hammer is used for positioning and observing the stand column to ensure the perpendicularity of the pile body of the pile machine, 2 theodolites are adopted to check the perpendicularity of the pile frame in the vertical direction, the positioning deviation is ensured to be not more than 10mm, and the perpendicularity is not more than 1/200.
3. The construction method of high-speed deep stirring according to claim 1, wherein in the step 1, the resistance reducing material is ionic surfactant solution with the type of sodium dodecyl sulfate or sodium dodecyl benzene sulfonate, and is prepared into micron-sized bubbles through a resistance reducing material preparation module, wherein the diameter range of the micron-sized bubbles is 1-100 microns; the curing material is ordinary portland cement, the slurry of the curing material is pumped into the high-pressure rubber tube through the grouting pump, the bubbles of the resistance reducing material are conveyed to the high-pressure rubber tube through the air press, the defoaming solvent is pumped into the high-pressure rubber tube through the grouting pump, and the curing material is conveyed to the high-pressure rubber tube through the air press.
4. The construction method of high-speed deep stirring according to claim 1, wherein the concentration a of the initial curing material slurry in the step 2 is in the range of 0-80%, the concentration b of the initial resistance reducing material is in the range of 0-20%, the normal working torque value N1 is 30000N.m, the limit working torque value N2 is 50000N.m, when the drill bit enters 0.2-0.5 m below the ground, the resistance reducing material and the curing material slurry start to be sprayed, the drilling speed is in the range of 0.4-1.0 m/min, and the rotating speed is in the range of 5-20 r/min.
5. The construction method of high-speed deep stirring as claimed in claim 1, wherein the drilling speed in step 4 is 0.5m/min to 2.5m/min, the rotation speed is 5r/min to 30r/min, the conveying speed of the solidified material is not affected by the air pressure, and the conveying speed of the solidified material is 100Kg/min to 300 Kg/min.
6. The construction method of high-speed deep stirring as claimed in claim 1, wherein the specific relationship between the pressure value of the high-pressure gas and the depth of the drill bit in step 4 is as follows:
(1) when the depth of the drill bit is less than 10m, the air pressure is 0-0.5 MPa;
(2) when the depth of the drill bit is within the range of 10 m-20 m, the air pressure is 0.5 MPa-1.0 MPa;
(3) when the depth of the drill bit is within the range of 20m to 30m, the air pressure is 0.5MPa to 1.5 MPa;
(4) when the depth of the drill bit is larger than 30m, the air pressure is 1.0 MPa-2.0 MPa.
7. The high-speed deep stirring construction method of claim 1, wherein the defoaming material is liquid, powder or solid particles, and the defoaming material includes but is not limited to polysiloxane, polyether modified silicone oil, polydimethylsiloxane, polyoxyethylene polyoxypropylene ether.
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