CN115522540A - Construction method of high-pressure jet grouting pile in water-rich flowing sand layer geology - Google Patents
Construction method of high-pressure jet grouting pile in water-rich flowing sand layer geology Download PDFInfo
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- CN115522540A CN115522540A CN202211339649.7A CN202211339649A CN115522540A CN 115522540 A CN115522540 A CN 115522540A CN 202211339649 A CN202211339649 A CN 202211339649A CN 115522540 A CN115522540 A CN 115522540A
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to the technical field of building construction, in particular to a construction method of a high-pressure jet grouting pile in water-rich flowing sand layer geology. The drilling and spraying integrated construction method is used for drilling holes and carrying out rotary spraying with slurry, the construction principle of top-down rotary spraying slurry is adopted in combination with a low-pressure slurry supplementing mode in the water-rich flowing sand layer geology, and the phenomenon that the hole collapse is blocked and the drill is buried is well controlled.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method of a high-pressure jet grouting pile in water-rich flowing sand layer geology.
Background
The high-pressure jet grouting is to form high-pressure jet flow to cut soil by means of cement paste to achieve the aim of reinforcing soft soil, the traditional rotary jet grouting method comprises a single-pipe method, a double-pipe method and a three-pipe method, and construction processes and parameters are determined according to test data before construction. When a permeable sand layer rich in high activity exists, the phenomena of drill sticking and drill burying occur under the geological condition through field pile testing, and the pile cannot be drilled. The water-rich quicksand layer has the advantages of large permeability coefficient, strong activity, poor self-stability, possible occurrence of a large amount of water gushing and sand gushing phenomena in the construction process and great harm to engineering. When bentonite or bentonite and cement slurry is used as a wall protection material, an expected effect can be achieved on a soil layer with low water content, a high-water-permeability sand flow layer cannot be realized, the phenomenon of drill sticking and drill burying still exists, great damage is caused to construction equipment, economic waste is caused, and the construction period and the pile forming quality are seriously affected.
Disclosure of Invention
The invention aims to solve the problems, and provides a construction method of a high-pressure jet grouting pile in the water-rich flowing sand layer geology, which can ensure the engineering construction quality.
The invention solves the problems and adopts the technical scheme that:
a construction method of a high-pressure jet grouting pile in water-rich flowing sand layer geology comprises the following steps:
the method comprises the following steps: presetting a triple-pipe high-pressure rotary spraying machine, a rotary spraying machine drill rod and a guniting drill bit, assembling, wherein the axis of a guniting drill bit grout nozzle inclines downwards along the horizontal direction, presetting a grout automatic stirrer and arranging a high-pressure grouting pump to form a grout stirring system, presetting an air compressor and arranging an air storage tank to form a compressed air system, presetting a clean water tank and arranging a high-pressure clean water pump to form a water storage system, and presetting a generator set and arranging a power distribution box to form a power generation system;
step two: after the triple-pipe high-pressure rotary spraying machine, the rotary spraying machine drill rod and the guniting drill bit are assembled, performing perpendicularity debugging on the rotary spraying machine drill rod;
step three: mounting a slurry stirring system, a compressed air system, a water storage system and a power generation system on a triple-pipe high-pressure rotary spraying machine, and checking whether the whole system works normally;
step four: before construction, firstly, trial spraying is carried out on the ground, whether air pipes leak air or not, whether water pipes leak water or not and the pressure of a grouting pump are checked;
step five: during construction, a drilling and spraying integrated construction method is preferably adopted, a cement paste spraying drill bit firstly sprays cement paste and then carries out drilling down to form holes, and gas and water are sprayed after drilling down;
step six: when drilling to the rich water flowing sand layer geology, carrying out rotary guniting from top to bottom through an included angle formed by downward inclination of a guniting drill bit grout nozzle, adopting cement and water glass double-grout for making grout, cutting flowing sand soil by gas, and filling the double-grout;
step seven: after the water-rich flowing sand layer geology is penetrated, the drilling and spraying integrated construction method in the step five is used for continuing construction until the water-rich flowing sand layer geology is drilled to the designed pile bottom, slurry, water and air are timely conveyed, grouting is carried out after the designed grouting pressure is reached, grouting is carried out by spraying while rotating, lifting and spraying, grouting is carried out from bottom to top, and the rotation and the lifting are continuous without interruption;
step eight: when the double-fluid slurry water-rich flowing sand layer is lifted to the geology of the grouted double-fluid slurry water-rich flowing sand layer, a low-pressure slurry supplementing mode is adopted, a drill rod of the rotary spraying machine is slowly lifted at the position of the geology, and a slurry spraying drill bit only sprays cement slurry but does not spray gas and water fluid;
step nine: when the guniting drill bit is lifted to be close to the designed pile top, the guniting drill bit is slowly lifted and jet-spun from 1m below the pile top until the guniting drill bit exceeds the designed pile top by 0.5 m, and then the guniting operation is stopped.
Compared with the prior art, the invention adopting the technical scheme has the outstanding characteristics that:
the method has the characteristics of short construction period, high safety performance, maximized economic benefit, wall protection material saving, high pile forming quality and the like, is suitable for various high-activity permeable layers, and is applied to urban construction with high environmental protection requirements.
Preferably, the invention further comprises:
in the fifth step, the water-cement ratio of the slurry is 0.8:1-1.2, the pressure of the slurry is between 0.5 and 2Mpa, and the hydraulic pressure is between 0.5 and 2 Mpa.
In the sixth step, the water-cement ratio of the slurry is between 1.5 and 1.2, the Baume degree is between 35 and 40 be', the pressure of the slurry is between 25 and 35Mpa, the hydraulic pressure of the slurry is between 20 and 35Mpa, the pressure of the air is between 0.5 and 1Mpa, and the rotating speed is between 15 and 25 r/min.
And seventhly, during injection grouting, the pressure of the slurry is between 30 and 40Mpa, the pressure of the water liquid is between 25 and 40Mpa, the pressure of the air is between 0.5 and 1Mpa, and the lifting speed is between 5 and 20 cm/min.
And step eight, the lifting speed of the rotary spraying machine drill is 30-50cm/min, and the rotating speed is 5-10 r/min.
Drawings
FIG. 1 is a schematic structural diagram of a triple-tube high-pressure jet grouting machine according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a drill rod of the jet grouting machine in the embodiment of the invention;
FIG. 3 is a schematic diagram of a guniting drill bit according to an embodiment of the invention;
FIG. 4 is a schematic structural view of a slurry agitation system according to an embodiment of the present invention;
FIG. 5 is a schematic view of a compressed air system according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a water storage system according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a power generation system according to an embodiment of the present invention;
FIG. 8 is a flow chart of the construction process of the present invention;
FIG. 9 is a schematic structural view of the construction method when the equipment is assembled and the trial spraying is performed;
FIG. 10 is a schematic structural diagram of a drilling and spraying integrated construction method adopted in the construction process by the construction method;
FIG. 11 is a schematic structural view of a water-rich quicksand layer in a reverse spraying manner during construction by the construction method;
FIG. 12 is a schematic structural view of the construction process of the construction method combining the reverse spraying method and the drilling and spraying integrated construction method;
FIG. 13 is a schematic structural view of rotary lifting and low-pressure slurry supplement in the construction process by the construction method;
FIG. 14 is a schematic structural view of the completion of the jet grouting in the construction process by the construction method;
labeled in the figure as: the device comprises a triple-pipe high-pressure rotary spraying machine 1, a rotary spraying machine drill rod 2, a guniting drill bit 3, a slurry stirring system 4, a compressed air system 5, a water storage system 6 and a power generation system 7.
Detailed Description
The invention will be further illustrated by the following examples, which are intended only for a better understanding of the present invention and therefore do not limit the scope of the invention.
A construction method of a high-pressure jet grouting pile in water-rich flowing sand layer geology comprises the following steps:
the method comprises the following steps: presetting a triple-tube high-pressure rotary spraying machine 1, a rotary spraying machine drill rod 2 and a guniting drill bit 3, assembling, wherein the model of the triple-tube high-pressure rotary spraying machine 1 is XPL-150, the drilling diameter is 400-1000mm, the maximum drilling depth is 150000mm, the rotating speed is 0-266m, the rotating speed of a power head is 0-278 r/min, the diameter of the rotary spraying machine drill rod 2 is 89mm, the length of each section is 3000mm, the guniting drill bit 3 is made of three-wing diamond, the diameter is 89mm, the number of nozzles is 4, wherein the upper two are water liquid nozzles and gas nozzles, the lower two are grout nozzles, the diameter of the nozzles is 2-3.5mm, the axes of the water liquid nozzles and the gas nozzles are arranged along the horizontal direction, the axes of the grout nozzles are inclined downwards by 10 degrees along the horizontal direction, presetting a grout automatic stirrer and matching a high-pressure grout injection pump to form a grout stirring system 4, the slurry automatic stirrer is ZJ2000L, the high-pressure grouting pump is GZB-40C, the rated power is 90kw, the rated pressure is 35-42MPa, an air compressor is preset and is provided with an air storage tank to form a compressed air system 5, the rated power of the air compressor is 30kw, the volume flow is 5m for year/min, the exhaust pressure is 0.8Mpa, the highest allowable working pressure of the air storage tank is 0.84Mpa, the volume is 1m for year, a clear water tank is preset and is provided with a high-pressure clear water pump to form a water storage system 6, the capacity of the clear water tank is 50L, the flow of the high-pressure clear water pump is 50m for year/h, the rated power is 15kw, a generator set is preset and is provided with a distribution box to form a power generation system 7, the power selection of the generator set is 400kw, the requirement that two sets of equipment operate simultaneously, 2 secondary distribution boxes and 6 tertiary distribution boxes can be met.
Step two: after the triple-pipe high-pressure rotary spraying machine 1, the rotary spraying machine drill rod 2 and the guniting drill bit 3 are assembled, perpendicularity debugging is carried out on the rotary spraying machine drill rod 2.
Step three: and a slurry stirring system 4, a compressed air system 5, a water storage system 6 and a power generation system 7 are arranged on the triple-pipe high-pressure rotary spraying machine 1, and whether the whole system works normally is checked.
Step four: before construction, firstly, trial spraying is carried out on the ground, whether air pipes leak air or not, whether water pipes leak water or not and the pressure of a grouting pump are checked.
Step five: during construction, a drilling and spraying integrated construction method is preferably adopted, a cement paste spraying drill bit 3 firstly sprays cement paste and then drills down to form holes, gas and water are sprayed after the drilling down, and the water cement ratio of the cement paste is 0.8:1-1.2, the slurry pressure is between 0.5 and 2Mpa, the hydraulic pressure is between 0.5 and 2Mpa, and the drilling and spraying integrated construction method is easy to form holes and avoids the blockage of a nozzle by soil.
Step six: when drilling into a water-rich flowing sand layer geology, the slurry is sprayed in a rotating mode from top to bottom through a 10-degree included angle formed by downward inclination of a slurry nozzle of a slurry spraying drill bit 3, a reverse spraying method is adopted, slurry is made through cement and water glass double slurries, the ratio of slurry to water and cement is 1.5-1, the baume degree is 35-40 be', the slurry pressure is 25-35Mpa, the hydraulic pressure is 20-35Mpa, the air pressure is 0.5-1Mpa, the rotating speed is 15-25r/min, the double slurries can achieve a good water stopping and reinforcing effect, the double slurries can be quickly condensed to be mixed with a sand layer to achieve a stabilizing effect, the strength of the water glass stones is high, the influence on the water quality environment is low, the method can well avoid the phenomenon that the drill rod is stuck and buried in a drill, gas cuts the flowing sand soil, and the double slurries are filled.
Step seven: and after penetrating through the water-rich flowing sand layer geology, replacing the drilling and spraying integrated construction method in the fifth step to continue construction until the pile is drilled to the designed pile bottom, timely conveying grout, water and air, spraying grouting from bottom to top while rotating, lifting and spraying when the designed grouting pressure is reached, wherein the rotating and lifting are continuously uninterrupted, the grout pressure is between 30 and 40MPa, the water pressure is between 25 and 40MPa, the air pressure is between 0.5 and 1MPa, and the lifting speed is between 5 and 20 cm/min.
Step eight: when the double-fluid water-rich flowing sand layer is lifted to the geological state, the low-pressure slurry supplementing mode is used, the drill rod 2 of the rotary spraying machine is slowly lifted at the position of the geological layer, the lifting speed of the rotary spraying machine drill is 30-50cm/min, the rotating speed is 5-10r/min, the slurry spraying drill 3 only sprays cement slurry without spraying gas and water, the low-pressure slurry supplementing mode can fill slurry loss and a sand-mud interlayer caused by hole forming, and the common problems of poor pile forming quality effect, low pile body strength and the like are solved.
Step nine: when the guniting drill bit 3 is lifted to be close to the designed pile top, the guniting drill bit is lifted slowly and sprayed in a rotary mode from 1m below the pile top, guniting operation is stopped when the guniting drill bit exceeds the designed pile top by 0.5 m, and after the drill rod 2 of the rotary spraying machine is lifted to the ground, all equipment is washed clean by clear water, and solidification and blockage are prevented.
The method has the characteristics of short construction period, high safety performance, maximized economic benefit, wall protection material saving, high pile forming quality and the like, is suitable for various high-activity permeable layers, and is applied to urban construction with high environmental protection requirements.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (5)
1. A construction method of a high-pressure jet grouting pile in water-rich flowing sand layer geology is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: presetting a triple-pipe high-pressure rotary spraying machine, a rotary spraying machine drill rod and a guniting drill bit, assembling, wherein the axis of a guniting drill bit grout nozzle inclines downwards along the horizontal direction, presetting a grout automatic stirrer and arranging a high-pressure grouting pump to form a grout stirring system, presetting an air compressor and arranging an air storage tank to form a compressed air system, presetting a clean water tank and arranging a high-pressure clean water pump to form a water storage system, and presetting a generator set and arranging a power distribution box to form a power generation system;
step two: after the triple-pipe high-pressure rotary spraying machine, the rotary spraying machine drill rod and the guniting drill bit are assembled, performing perpendicularity debugging on the rotary spraying machine drill rod;
step three: mounting a slurry stirring system, a compressed air system, a water storage system and a power generation system on a triple-pipe high-pressure rotary spraying machine, and checking whether the whole system works normally;
step four: before construction, trial spraying is carried out on the ground, whether air pipes leak air or not, whether water pipes leak water or not and the pressure of a grouting pump are checked;
step five: during construction, a drilling and spraying integrated construction method is preferably adopted, a cement paste spraying drill bit firstly sprays cement paste and then carries out drilling down to form holes, and gas and water are sprayed after drilling down;
step six: when drilling to the rich water flowing sand layer geology, carrying out rotary guniting from top to bottom through an included angle formed by downward inclination of a guniting drill bit grout nozzle, adopting cement and water glass double-grout for making grout, cutting flowing sand soil by gas, and filling the double-grout;
step seven: after penetrating through the water-rich quicksand layer geology, the drilling and spraying integrated construction method in the step five is used for continuing construction until the drilling reaches the designed pile bottom, slurry, water and air are timely conveyed, after the designed slurry spraying pressure is reached, grouting is carried out by spraying, and grouting is carried out from bottom to top while rotating, lifting and spraying, wherein the rotating and lifting are continuous and uninterrupted;
step eight: when the double-fluid slurry water-rich flowing sand layer is lifted to the geology of the grouted double-fluid slurry water-rich flowing sand layer, a low-pressure slurry supplementing mode is adopted, a drill rod of the rotary spraying machine is slowly lifted at the position of the geology, and a slurry spraying drill bit only sprays cement slurry but does not spray gas and water fluid;
step nine: when the guniting drill bit is lifted to be close to the designed pile top, the guniting drill bit is slowly lifted and jet-spun from 1m below the pile top until the guniting drill bit exceeds the designed pile top by 0.5 m, and then the guniting operation is stopped.
2. The construction method of the high-pressure jet grouting pile in the water-rich flowing sand layer geology according to claim 1 is characterized in that: in the fifth step, the water-cement ratio of the slurry is 0.8:1-1.2, the pressure of the slurry is between 0.5 and 2Mpa, and the hydraulic pressure is between 0.5 and 2 Mpa.
3. The construction method of the high-pressure jet grouting pile in the water-rich flowing sand layer geology according to claim 1 is characterized in that: in the sixth step, the water-cement ratio of the slurry is between 1.5 and 1.2, the Baume degree is between 35 and 40 be', the pressure of the slurry is between 25 and 35Mpa, the hydraulic pressure of the slurry is between 20 and 35Mpa, the pressure of the air is between 0.5 and 1Mpa, and the rotating speed is between 15 and 25 r/min.
4. The construction method of the high-pressure jet grouting pile in the water-rich flowing sand layer geology according to the claim 1, which is characterized in that: and seventhly, during injection grouting, the pressure of the slurry is between 30 and 40Mpa, the pressure of the water liquid is between 25 and 40Mpa, the pressure of the air is between 0.5 and 1Mpa, and the lifting speed is between 5 and 20 cm/min.
5. The construction method of the high-pressure jet grouting pile in the water-rich flowing sand layer geology according to the claim 1, which is characterized in that: and step eight, the lifting speed of the rotary spraying machine drill is 30-50cm/min, and the rotating speed is 5-10 r/min.
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| CN202211339649.7A CN115522540A (en) | 2022-10-29 | 2022-10-29 | Construction method of high-pressure jet grouting pile in water-rich flowing sand layer geology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116658068A (en) * | 2023-06-06 | 2023-08-29 | 江苏省送变电有限公司 | High-pressure rotary jet drilling machine adaptive to stratum and construction method thereof |
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- 2022-10-29 CN CN202211339649.7A patent/CN115522540A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116658068A (en) * | 2023-06-06 | 2023-08-29 | 江苏省送变电有限公司 | High-pressure rotary jet drilling machine adaptive to stratum and construction method thereof |
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