CN115198739A - Construction method of high-pressure jet grouting pile and high-pressure jet grouting parameter monitoring system device used in construction method - Google Patents
Construction method of high-pressure jet grouting pile and high-pressure jet grouting parameter monitoring system device used in construction method Download PDFInfo
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- CN115198739A CN115198739A CN202210988658.2A CN202210988658A CN115198739A CN 115198739 A CN115198739 A CN 115198739A CN 202210988658 A CN202210988658 A CN 202210988658A CN 115198739 A CN115198739 A CN 115198739A
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- 238000010276 construction Methods 0.000 title claims abstract description 58
- 238000012544 monitoring process Methods 0.000 title claims abstract description 22
- 238000005507 spraying Methods 0.000 claims abstract description 197
- 239000002002 slurry Substances 0.000 claims abstract description 86
- 239000002689 soil Substances 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000005553 drilling Methods 0.000 claims abstract description 47
- 239000004568 cement Substances 0.000 claims abstract description 33
- 230000001681 protective effect Effects 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims description 33
- 238000012545 processing Methods 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 8
- 239000000706 filtrate Substances 0.000 claims description 6
- 239000011268 mixed slurry Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000005056 compaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material 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
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- 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
- E21B45/00—Measuring the drilling time or rate of penetration
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- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/024—Determining slope or direction of devices in the borehole
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- Structural Engineering (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a construction method of a high-pressure jet grouting pile and a high-pressure jet grouting parameter monitoring system device used by the same, wherein the method comprises the following steps: drilling a foundation by a drilling machine, and vertically putting a protection pipe in the drilled hole; (II) the rotary spraying drill rod is inserted into the soil body from the protective pipe by the pile machine, high-pressure water and compressed air are sprayed into the soil body in a rotary mode through the rotary spraying drill rod, and the rotary spraying drill rod is vertically moved downwards while being sprayed in a rotary mode, so that a rotary spraying hole position is formed in the soil body; and (III) switching high-pressure water into high-pressure slurry and compressed air, respectively and rotatably spraying the high-pressure slurry and the compressed air into the rotary spraying hole site through a rotary spraying drill rod, and moving the rotary spraying drill rod vertically upwards while rotatably spraying to fully mix the slurry with a soil body to form a columnar consolidated rotary spraying pile in the soil body. The construction method provided by the invention can greatly improve the utilization rate of cement paste, realizes the real-time monitoring of the verticality of the rotary spraying drill rod in the rotary spraying process, has no lap joint of the pile body, and ensures the integrity and quality of the formed rotary spraying pile.
Description
Technical Field
The invention belongs to the technical field of foundation treatment, and relates to a construction method of a high-pressure jet grouting pile and a high-pressure jet grouting parameter monitoring system device used in the construction method.
Background
The foundation refers to the part of the soil body which bears the influence of the load of the superstructure. The soil or rock mass under the foundation that bears the entire load of the building is called the foundation. The foundation does not belong to the building component, but has a very important role in ensuring the firmness and durability of the building. The treatment of the foundation is very important in architecture, and whether the upper building is firm or not has the function of replacing the foundation. The foundation of the building is not well treated, the superstructure is likely to collapse, and the main purpose of the foundation treatment is to adopt various foundation treatment methods to improve the foundation condition.
The foundation treatment method is a method for reinforcing or improving the foundation as necessary according to the requirements of the upper structure on the foundation, improving the bearing capacity of foundation soil, ensuring the stability of the foundation, reducing the settlement or uneven settlement of the upper structure, eliminating the collapsibility of collapsible loess and improving the liquefaction resistance. Currently, common foundation treatment methods include an in-hole deep layer dynamic compaction method, a pad layer replacement method, a dynamic compaction method, a sand-stone pile method, a vibroflotation method, a cement-soil stirring method, a high-pressure injection grouting method, a pre-compaction method, a rammed cement-soil pile method, a cement fly ash gravel pile method, a lime-soil compaction pile method and a soil compaction pile method, a column hammer impact pile-expanding method, a single-liquid silicification method, an alkali-liquid method, and the like. Among them, the most common and mature treatment is high pressure jet grouting.
The principle of the high-pressure jet grouting method is that after a drilling machine drills a grouting pipe with a nozzle into a predetermined position of a soil layer, a jet flow is formed through high-pressure equipment to impact and damage the soil body. When the energy is large, the speed is high and the dynamic pressure in a pulse shape exceeds the structural strength of the soil body, the soil particles are peeled off from the soil body. The damaged part of fine soil particles are blown out of the water surface along with the slurry, the rest of soil particles are stirred and mixed with the slurry under the action of the impact force of a jet flow, centrifugal force, gravity and the like, and are regularly rearranged according to a certain slurry-soil proportion and mass, and after the slurry is solidified, a solidified body is formed in the soil.
The high-pressure jet grouting pile construction equipment is small, can be implemented in a narrow space, has strong applicability, and is suitable for treating silt, mucky soil, cohesive soil, silt, artificial filling and gravel soil foundations. When the foundation contains more large-particle-size rock blocks, a large number of plant rhizomes or higher organic matters, the applicability of the foundation is determined according to field test results. The method is not suitable for the conditions that the underground water flow velocity is too high, the injected slurry cannot be solidified around the grouting sleeve and the like. The high-pressure jet grouting pile has larger treatment depth, can be used as a waterproof curtain of a deep foundation pit or a dam besides foundation reinforcement, and has the maximum treatment depth of over 30m at present.
However, the high-pressure jet grouting pile is often poor in pile forming quality in the foundation treatment construction of a sand-containing layer, the pile diameter and the strength cannot be guaranteed, and the foundation treatment effect is seriously influenced. The construction method of the prior high-pressure jet grouting pile for treating the foundation of a sand-containing layer is mainly characterized in that a certain amount of bentonite is added into cement paste, the pile forming effect is better in a sand layer with lower water content, but the pile forming quality of the jet grouting pile is still poorer in a flowing sand layer with higher water content. In order to ensure the final pile forming quality of the jet grouting pile, repeated spraying is usually needed, the pile diameter is often larger than the designed pile diameter, a large amount of cement paste is wasted, and the construction cost is increased.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a construction method of a high-pressure jet grouting pile and a high-pressure jet grouting parameter monitoring system device used in the construction method, which have the advantages of simple process, high construction efficiency, high pile body vertical precision, high cement paste utilization rate, low construction cost, good pile forming quality, high safety and higher economic and social benefits.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a construction method of a high-pressure jet grouting pile, including:
drilling a foundation by a drilling machine, and vertically putting a protective pipe into the drilled hole;
(II) a rotary spraying drill rod is inserted into the soil body from the protective pipe, high-pressure water and compressed air are sprayed into the soil body through the rotary spraying drill rod in a rotary mode, and the rotary spraying drill rod is vertically moved while being sprayed in a rotary mode, so that rotary spraying hole sites are formed in the soil body;
(III) switching high-pressure water into high-pressure slurry and compressed air, respectively and spirally spraying the high-pressure slurry and the compressed air into the rotary spraying hole position through a rotary spraying drill rod, and vertically moving the rotary spraying drill rod while spirally spraying to fully mix the slurry with the soil body to form the columnar solidified rotary spraying pile in the soil body.
The use method provided by the invention adopts a two-step pile forming mode, firstly, the rotary spraying hole position is formed in the soil body of the foundation by rotary spraying from top to bottom, and then the high-pressure slurry and the compressed air are sprayed in the rotary spraying hole position from bottom to top in a rotary manner, so that the high-pressure rotary spraying pile is formed, the pile forming quality of the high-pressure rotary spraying pile is effectively improved, the foundation treatment effect is ensured, the probability of inconsistent aperture and low strength of the high-pressure rotary spraying pile in a flowing sand layer is greatly reduced, the frequency of re-spraying due to poor pile forming quality of the high-pressure rotary spraying pile is reduced, and the slurry is prevented from being wasted greatly.
As a preferable technical scheme of the invention, in the step (I), the drilling machine is a full casing drilling machine.
Preferably, the drilling machine is used for guiding the hole from the surface of the foundation to a position 3-5 m below the pile top height, such as 3.0m, 3.5m, 4.0m, 4.5m or 5.0m, but the drilling machine is not limited to the values listed, and other values not listed in the numerical range are also applicable.
Preferably, the full casing drill uses full casing having an outside diameter of 200 to 220mm, such as 200mm, 202mm, 204mm, 206mm, 208mm, 210mm, 212mm, 214mm, 216mm, 218mm or 220mm, but not limited to the recited values, and other values not recited within this range are equally applicable.
Preferably, the full casing drill uses full casing having an internal diameter of 180 to 190mm, such as 180mm, 181mm, 182mm, 183mm, 184mm, 185mm, 186mm, 187mm, 188mm, 189mm or 190mm, but is not limited to the values listed, and other values not listed in this range are equally applicable.
The invention adopts the full casing drill to guide the hole, the drill guides the hole from the ground to the position 3-5 m below the elevation of the pile top, and the guide performance of the full casing drill hole and the casing rigidity are utilized to improve the hole guiding precision. In order to guarantee the high requirement of the verticality, the verticality of the lead hole is monitored in time, and the precision requirement of the verticality of the lead hole reaches 1/400.
Preferably, the inner diameter of the protective pipe is larger than the diameter of the rotary spraying drill rod, an annular cavity between the inner wall of the protective pipe and the outer wall of the rotary spraying drill rod forms a slurry return channel, and when the rotary spraying drill rod is in rotary spraying, high-pressure slurry is discharged from the slurry return channel.
According to the invention, the protective pipe is put in the drill hole after the verticality detection is qualified, the protective pipe can be a PVC pipe, an effective slurry return channel is established through the annular cavity while the protective pipe is used for protecting the wall, and the replacement rate of cement slurry is further improved. The protective pipe can also effectively prevent the rotary spraying drill rod from being locked.
Preferably, the inner diameter of the protective tube is 160 to 170mm, for example 160mm, 161mm, 162mm, 163mm, 164mm, 165mm, 166mm, 167mm, 168mm, 169mm, or 170mm, but is not limited to the values listed, and other values not listed in this range are equally applicable.
Preferably, the outer diameter of the protective tube is 170 to 180mm, and may be, for example, 170mm, 171mm, 172mm, 173mm, 174mm, 175mm, 176mm, 177mm, 178mm, 179mm or 180mm, but is not limited to the values listed, and other values not listed in the range of values are also applicable.
Preferably, the diameter of the rotary jet drill rod is 80 to 150mm, for example 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 125mm, 130mm, 135mm, 140mm, 145mm or 150mm, but is not limited to the recited values, and other values not recited in the range of values are also applicable.
As a preferable technical scheme of the invention, in the step (II), the rotary spraying drill rod moves from top to bottom while spraying high-pressure water and compressed air in a rotary manner, so that the rotary spraying hole position is formed in the soil body.
Preferably, the high-pressure water and the compressed air are respectively sprayed into the soil body in a rotating way through the rotating spray drill rod to dilute the soil body, so that the specific gravity of the soil body is reduced to 1300-1400 kg/m 3 For example, 1300kg/m may be used 3 、1310kg/m 3 、1320kg/m 3 、1330kg/m 3 、1340kg/m 3 、1350kg/m 3 、1360kg/m 3 、1370kg/m 3 、1380kg/m 3 、1390kg/m 3 Or 1400kg/m 3 However, the numerical values recited are not intended to be limiting, and other numerical values not recited within the numerical range may be equally applicable.
Preferably, the moving speed of the rotary spraying drill rod when the high-pressure water and the compressed air are sprayed in a rotary manner is 10-15 cm/min, such as 10cm/min, 10.5cm/min, 11cm/min, 11.5cm/min, 12cm/min, 12.5cm/min, 13cm/min, 13.5cm/min, 14cm/min, 14.5cm/min or 15cm/min, but the moving speed is not limited to the enumerated values, and other non-enumerated values in the numerical range are also applicable.
Preferably, the injection pressure of the high-pressure water is 40 to 55MPa, and may be, for example, 40MPa, 41MPa, 42MPa, 43MPa, 44MPa, 45MPa, 46MPa, 47MPa, 48MPa, 49MPa, 50MPa, 51MPa, 52MPa, 53MPa, 54MPa or 55MPa, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.
Preferably, the high-pressure water jet has a flow rate of 300 to 500L/min, for example 300L/min, 320L/min, 340L/min, 360L/min, 380L/min, 400L/min, 420L/min, 440L/min, 460L/min, 480L/min or 500L/min, but is not limited to the recited values, and other values not recited in the range of values are equally applicable.
Preferably, the rotational speed of the rotary spray drill rod is 5 to 10r/min, for example 5.0r/min, 5.5r/min, 6.0r/min, 6.5r/min, 7.0r/min, 7.5r/min, 8.0r/min, 8.5r/min, 9.0r/min, 9.5r/min or 10.0r/min, but is not limited to the values listed, and other values not listed in the range of values are equally applicable.
As a preferable technical scheme of the invention, in the step (iii), the rotary spraying drill rod moves from the bottom of the rotary spraying hole to the top of the rotary spraying hole while performing rotary spraying, so that soil in the rotary spraying hole is fully mixed with slurry.
It should be noted that when the rotary spraying drill rod reaches a preset depth, high-pressure slurry and compressed air are conveyed to a nozzle of the rotary spraying drill rod, the drill rod drives the nozzle to rotate and performs rotary spraying operation from bottom to top, and slurry overflow is observed in the rotary spraying process. The rotary spraying process is continuously carried out, and if the pressure suddenly changes in the rotary spraying process or abnormal conditions such as slurry leakage and slurry mixing occur, the rotary spraying is stopped, and faults are timely eliminated. When the rotary spraying is carried out again, the rotary spraying drill rod is inserted downwards for a certain distance and then is subjected to rotary spraying again, so that the phenomenon of pile breakage is prevented.
The pump body for transporting cement paste optionally adopts a variable-frequency high-pressure pump, a pressure gauge and a safety valve are installed on the variable-frequency high-pressure pump, and the safety valve can be automatically opened to release pressure. The pile machine leads the rotary spraying drill rod with two nozzles into the protective pipe until reaching the preset depth, and the variable-frequency high-pressure pump conveys the mixed cement paste into the conveying channels of the rotary spraying drill rod respectively. The rotary spraying drill rod is provided with a drill bit at the bottom, two nozzles are arranged at the drill bit, high-pressure slurry and compressed air are sprayed to the periphery through the two nozzles at the bottom of the rotary spraying drill rod respectively, and the rotary spraying drill rod drives the nozzles to rotate and lift from bottom to top to perform rotary spraying operation. Wherein, the flow rate of the high-pressure pump can be selected to be 500L/min, and the diameter of the nozzle can be selected to be 4.0mm.
Preferably, the moving speed of the rotary spraying drill rod from the bottom of the rotary spraying hole position to the rotary spraying hole position is 5-10 cm/min, such as 5.0cm/min, 5.5cm/min, 6.0cm/min, 6.5cm/min, 7.0cm/min, 7.5cm/min, 8.0cm/min, 8.5cm/min, 9.0cm/min, 9.5cm/min or 10.0cm/min, but is not limited to the enumerated values, and other non-enumerated values in the numerical range are also applicable.
Preferably, the high pressure slurry is injected at a pressure of 30 to 40MPa, for example, 30MPa, 31MPa, 32MPa, 33MPa, 34MPa, 35MPa, 36MPa, 37MPa, 38MPa, 39MPa or 40MPa, but the injection pressure is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
Preferably, the high pressure slurry has a flow rate of 300 to 400L/min, such as 300L/min, 310L/min, 320L/min, 330L/min, 340L/min, 350L/min, 360L/min, 370L/min, 380L/min, 390L/min or 400L/min, but not limited to the recited values, and other values not recited in the range are equally applicable.
Preferably, the injection pressure of the compressed air is 0.7 to 1.5MPa, and may be, for example, 0.7MPa, 0.8MPa, 0.9MPa, 1.0MPa, 1.1MPa, 1.2MPa, 1.3MPa, 1.4MPa or 1.5MPa, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.
Preferably, the rotational speed of the rotary jet drill pipe is 5 to 10r/min, such as 5.0r/min, 5.5r/min, 6.0r/min, 6.5r/min, 7.0r/min, 7.5r/min, 8.0r/min, 8.5r/min, 9.0r/min, 9.5r/min or 10.0r/min, but not limited to the values listed, and other values not listed in the range of values are equally applicable.
Preferably, the rotary spraying drill rod vertically moves upwards to the top of the rotary spraying hole site after staying at the bottom of the rotary spraying hole site for a period of time.
Preferably, the rotary spraying drill rod stays at the bottom of the rotary spraying hole site for 1-5 min, for example, 1.0min, 1.5min, 2.0min, 2.5min, 3.0min, 3.5min, 4.0min, 4.5min or 5.0min, but the rotary spraying drill rod is not limited to the enumerated values, and other non-enumerated values in the numerical range are also applicable.
As a preferred technical solution of the present invention, in the step (iii), the high-pressure slurry is prepared by the following method:
mixing water and cement according to a preset water-cement ratio, uniformly stirring to obtain mixed slurry, filtering the mixed slurry at least once to obtain filtrate, and pressurizing the filtrate by using a high-pressure pump to obtain high-pressure slurry.
It should be noted that the cement slurry is strictly prepared according to a preset proportion, and when in use, the caking in the cement needs to be screened in advance, so that the cement slurry can be prevented from being segregated, the cement slurry can be continuously stirred in a mixer, and the cement slurry is slowly poured into a hopper before being pressed.
Preferably, the cement is p.o42.5 portland cement.
Preferably, the water-to-cement ratio is 1 to 2, and may be, for example, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0, but is not limited to the recited values, and other values not recited within the range of values are equally applicable.
As a preferred technical scheme of the invention, at least two mutually independent conveying channels are arranged in the rotary spraying drill rod along the length direction, and the outlet end of each conveying channel is positioned at the side wall of the bottom end of the rotary spraying drill rod; at least 2 nozzles are arranged on the side wall of the bottom end of the rotary spraying drill rod, and the outlet ends of the conveying channels are respectively connected with one nozzle; and respectively conveying high-pressure water, high-pressure slurry and compressed air into the nozzle through different conveying channels.
Preferably, the nozzle has a diameter of 3 to 5mm, and may be, for example, 3.0mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4.0mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm or 5.0mm, but is not limited to the values recited, and other values not recited within this range are equally applicable.
As a preferred technical solution of the present invention, the step (i) further comprises: before drilling the foundation, preparation work before construction is carried out.
Preferably, the preparation work includes the steps of:
(1) Geological exploration and site cleaning: carrying out geological exploration and knowing the structural conditions of pipelines, buildings, structures and public facilities nearby the engineering, finishing the cleaning of a construction site, and carrying out early-stage preparation work such as electrifying, water passing and the like;
(2) And (3) measuring and laying the perpendicularity of the pile position: measuring the pile position construction axis of the jet grouting pile, determining whether the perpendicularity of the pile position construction axis reaches the standard, arranging markers at the pile position, and positioning the pile position;
(3) Equipment installation and debugging: leveling and centering the drilling machine, debugging various compression pumps, and determining whether the equipment operates normally; laying a pipeline and checking whether a valve is normally opened; and (5) confirming the length of the jet grouting drill rod, carrying out a low-pressure water jet experiment, and checking whether the nozzle and the pressure are normal or not.
The complete process of the construction method provided by the invention comprises the following steps: geological exploration and site cleaning → measurement and layout of perpendicularity of pile positions → full casing pilot hole (perpendicularity inspection) → lowering protective pipe → pile driver in place → lowering rotary spraying drill rod → high-pressure water is sprayed from top to bottom in a rotary manner → high-pressure slurry and compressed air are sprayed from bottom to top in a rotary manner → the spray is finished to form the rotary spraying pile → the rotary spraying drill rod is cleaned → the rotary spraying drill rod is moved to the next pile position for construction.
In a second aspect, the invention provides a high-pressure jet grouting parameter monitoring system device used in the construction method of the high-pressure jet grouting pile, where the high-pressure jet grouting parameter monitoring system device includes a data processing module, and a jet grouting detection module and a drilling detection module which are respectively and electrically connected to the data processing module, and the drilling detection module is configured to detect the drilling depth, the rotation speed, the inclination angle, and the movement speed of a jet grouting drill rod, and transmit the detected data to the data processing module; the rotary spraying detection module is used for detecting the spraying pressure of the high-pressure slurry, the flow of the high-pressure slurry, the spraying pressure of the high-pressure water, the flow of the high-pressure water, the pressure of the compressed air and the flow of the compressed air, and transmitting the detected data to the data processing module.
The invention also provides a high-pressure jet grouting parameter monitoring system device, which is used for monitoring the parameters of the jet grouting state and the parameters of the drilling state in real time in the high-pressure jet grouting construction process so as to conveniently control the quality of the jet grouting pile, and meanwhile, is convenient for taking adjustment measures in time when abnormal conditions occur in the construction process so as to ensure the construction quality and the construction safety.
As a preferred technical solution of the present invention, the jet grouting detection module includes a slurry pressure sensor, a slurry flow meter, a water pressure sensor, a high pressure water flow meter, an air pressure sensor, and an air flow meter.
Preferably, the borehole detection module comprises a distance sensor, a tilt sensor and an angular velocity sensor.
In the invention, the distance sensor is used for detecting the penetration depth of the jet grouting drill rod. The inclination angle sensor is used for detecting the inclination angle of the rotary spraying drill rod relative to the vertical direction in the construction process. The dip angle sensor can selectively adopt a double-shaft dip angle sensor, the range of each shaft is +/-90 degrees, the dip angle sensor is arranged in the middle of the rotary spraying drill rod, and the dip angle sensor is horizontally arranged on the basis that the rotary spraying drill rod is vertical to the ground. After the installation is finished, the theodolite is used for calibrating the inclination angle sensor, after the initial position calibration is finished, the double-shaft inclination angle sensor can detect the offset of the axis of the rotary spraying drill rod in the vertical direction, and therefore the included angle between the rotary spraying drill rod and the vertical direction is obtained through calculation. The angular velocity sensor is used for detecting the rotating speed of the jet grouting drill rod so as to ensure the pile body diameter and the pile forming quality of the jet grouting pile.
The data processing module in the invention is provided with a fault diagnosis program, and can analyze the detection results of the jet grouting detection module and the drilling detection module so as to carry out online fault monitoring and adjustment measure suggestion on the construction process.
It should be noted that the present invention is not particularly limited to the specific requirements and the specific configurations of the detecting elements such as the distance sensor, the tilt sensor, and the angular velocity sensor, and related devices disclosed in the prior art or not disclosed in the new art can be also used in the present invention.
As a preferred technical solution of the present invention, the data processing module includes a controller, a display unit and an alarm unit, the controller is electrically connected to the jet grouting detection module and the drilling detection module, respectively, and the controller is electrically connected to the display unit and the alarm unit.
The data processing module provided by the invention also comprises a display unit which is used for displaying various state parameters processed by the data processing module in real time, so that an operator can intuitively master various state parameters in the current construction process in real time, and can take adjustment measures in time under abnormal conditions to ensure the engineering quality. Further preferably, the display unit may be provided with data analysis software inside, and the collected state parameters are displayed to the operator in a graphical or tabular form. In order to improve the practicability of the parameter monitoring system device, an alarm unit is additionally arranged in the data processing module, the current working state is subjected to overrun judgment according to the initial parameter range set by an operator, and an alarm is given when the acquired state parameter exceeds a set value so as to remind the operator to take safety measures in time. The display unit is also matched with input equipment, which comprises an operation panel with entity keys and/or touch screen keys and is used for an operator to input data, select different working modes, set the safe working range of parameters and the like.
The recitation of numerical ranges herein includes not only the above-recited numerical values, but also any numerical values between non-recited numerical ranges, and is not intended to be exhaustive or to limit the invention to the precise numerical values encompassed within the range for brevity and clarity.
Compared with the prior art, the invention has the following beneficial effects:
the use method provided by the invention adopts a two-step pile forming mode, firstly, the rotary spraying hole position is formed in the soil body of the foundation by rotary spraying from top to bottom, and then the high-pressure slurry and the compressed air are sprayed in the rotary spraying hole position from bottom to top in a rotary manner, so that the high-pressure rotary spraying pile is formed, the pile forming quality of the high-pressure rotary spraying pile is effectively improved, the foundation treatment effect is ensured, the probability of inconsistent aperture and low strength of the high-pressure rotary spraying pile in a flowing sand layer is greatly reduced, the frequency of re-spraying due to poor pile forming quality of the high-pressure rotary spraying pile is reduced, and the slurry is prevented from being wasted greatly.
Drawings
Fig. 1 is a process flow diagram of a construction method of a high-pressure jet grouting pile according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a high-pressure water-jet process according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a rotary jetting process of high pressure slurry and compressed air according to an embodiment of the present invention;
wherein, 1-jet grouting drill pipe; 2-a protective tube; 3-spraying hole sites in a rotary mode; 4-jet grouting pile; 5-reverse pulp channel.
Detailed Description
It is to be understood that in the description of the present invention, the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and therefore are not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further described below by way of specific embodiments.
In one embodiment, the present invention provides a method for constructing a high pressure jet grouting pile, as shown in fig. 1, the method comprising:
drilling a foundation by a drilling machine, and vertically putting a protective pipe 2 into the drilled hole;
(II) the rotary spraying drill rod 1 is inserted into the soil body from the protective pipe 2, high-pressure water and compressed air are sprayed into the soil body through the rotary spraying drill rod 1 in a rotary mode, the rotary spraying drill rod 1 is moved vertically while the rotary spraying is carried out, and a rotary spraying hole position 3 is formed in the soil body (as shown in figure 2);
(III) switching high-pressure water into high-pressure slurry and compressed air, respectively and spirally spraying the high-pressure slurry and the compressed air into the rotary spraying hole position 3 through the rotary spraying drill rod 1, and vertically moving the rotary spraying drill rod 1 while performing rotary spraying to fully mix the slurry with a soil body to form a columnar consolidated rotary spraying pile 4 in the soil body (as shown in figure 3).
The use method provided by the invention adopts a two-step pile forming mode, firstly, the rotary spraying hole position 3 is formed in the soil body of the foundation by rotary spraying from top to bottom, and then, the high-pressure slurry and compressed air are sprayed from bottom to top in the rotary spraying hole position 3, so that the high-pressure rotary spraying pile is formed, the pile forming quality of the high-pressure rotary spraying pile is effectively improved, the foundation treatment effect is ensured, the probability of inconsistent aperture and low strength of the high-pressure rotary spraying pile in a flowing sand layer is greatly reduced, the frequency of repeated spraying due to poor pile forming quality of the high-pressure rotary spraying pile is reduced, and the slurry waste is avoided.
Further, in the step (I), the drilling machine is a full casing drilling machine.
Further, the drilling machine leads holes from the surface of the foundation to the position 3-5 m below the elevation of the pile top.
Further, the outer diameter of a full casing adopted by the full casing drilling machine is 200-220 mm.
Further, the inner diameter of a full casing adopted by the full casing drilling machine is 180-190 mm.
The invention adopts the full-casing drilling machine to guide the hole, the drilling machine enters the position 3-5 m below the elevation of the pile top from the ground guide hole, and the guide performance of the full-casing drilling hole and the rigidity of the casing are utilized to improve the guide hole precision. In order to guarantee the high requirement of the perpendicularity, the perpendicularity of the lead hole is monitored in time, and the precision requirement of the perpendicularity of the lead hole reaches 1/400.
Further, the inner diameter of the protective pipe 2 is larger than the diameter of the rotary spraying drill rod 1, an annular cavity between the inner wall of the protective pipe 2 and the outer wall of the rotary spraying drill rod 1 forms a reverse slurry channel 5, and high-pressure slurry is discharged from the reverse slurry channel 5 when the rotary spraying drill rod 1 is in rotary spraying.
According to the invention, after the verticality detection is qualified, the protective pipe 2 is arranged below the drill hole, the protective pipe 2 can be a PVC pipe, and an effective slurry return channel is established through the annular cavity while the protective wall of the protective pipe 2 is utilized, so that the replacement rate of cement slurry is further improved. The protective pipe can also effectively prevent the rotary spraying drill rod from being locked.
Furthermore, the inner diameter of the protective pipe 2 is 160-170 mm.
Further, the outer diameter of the protective tube 2 is 170-180 mm.
Further, the diameter of the rotary spraying drill rod 1 is 80-150 mm.
Further, in the step (II), the rotary spraying drill rod 1 moves from top to bottom while spraying high-pressure water and compressed air in a rotary manner, so that the rotary spraying hole sites 3 are formed in a soil body.
Further, high-pressure water and compressed air are respectively sprayed into the soil body through the rotary spraying drill rod 1 to dilute the soil body, so that the specific gravity of the soil body is reduced to 1300-1400 kg/m 3 。
Further, the moving speed of the rotary spraying drill rod 1 during rotary spraying of high-pressure water and compressed air is 10-15 cm/min.
Further, the injection pressure of the high-pressure water is 40 to 55MPa.
Further, the high-pressure water is sprayed at a flow rate of 300-500L/min.
Further, the rotating speed of the jet grouting drill rod 1 is 5-10 r/min.
Further, in the step (III), the rotary spraying drill rod 1 is moved to the top of the rotary spraying hole site 3 from the bottom of the rotary spraying hole site 3 while being in rotary spraying, so that soil in the rotary spraying hole site 3 is fully mixed with slurry.
It should be noted that when the rotary spraying drill rod 1 reaches a preset depth, high-pressure slurry and compressed air are conveyed to the nozzle of the rotary spraying drill rod 1, the drill rod drives the nozzle to rotate and performs rotary spraying operation from bottom to top, and during the rotary spraying process, the slurry overflow condition is observed. The rotary spraying process is continuously carried out, and if the pressure suddenly changes in the rotary spraying process or abnormal conditions such as slurry leakage and slurry mixing occur, the rotary spraying is stopped, and faults are timely eliminated. When the rotary spraying is carried out again, the rotary spraying drill rod 1 is inserted downwards for a certain distance and then is subjected to rotary spraying again, so that the phenomenon of pile breaking is prevented.
The pump body for transporting cement paste optionally adopts a variable frequency high-pressure pump, a pressure gauge and a safety valve are installed on the variable frequency high-pressure pump, and the safety valve can automatically open for pressure relief. The pile machine leads the rotary spraying drill rod 1 with two nozzles into the protective pipe 2 until reaching the preset depth, and the frequency conversion high-pressure pump conveys the mixed cement paste into the conveying channels of the rotary spraying drill rod 1 respectively. The bottom of the rotary spraying drill rod 1 is provided with a drill bit, two nozzles are arranged at the drill bit, high-pressure slurry and compressed air are respectively sprayed to the periphery through the two nozzles at the bottom of the rotary spraying drill rod 1, and the rotary spraying drill rod 1 drives the nozzles to rotate and lift from bottom to top to carry out rotary spraying operation. Wherein, the flow rate of the high-pressure pump can be selected to be 500L/min, and the diameter of the nozzle can be selected to be 4.0mm.
Further, the moving speed of the rotary spraying drill rod 1 from the bottom of the rotary spraying hole position 3 to the rotary spraying hole position 3 is 5-10 cm/min.
Further, the injection pressure of the high-pressure slurry is 30-40 MPa.
Further, the flow rate of the high-pressure slurry is 300-400L/min.
Further, the injection pressure of the compressed air is 0.7 to 1.5MPa.
Further, the rotating speed of the rotary spraying drill rod 1 is 5-10 r/min.
Further, the rotary spraying drill rod 1 stays at the bottom of the rotary spraying hole site 3 for a period of time and then vertically moves upwards to the top of the rotary spraying hole site 3.
Further, the rotary spraying drill rod 1 stays at the bottom of the rotary spraying hole position 3 for 1-5 min.
Further, in the step (iii), the high-pressure slurry is prepared by the following method:
mixing water and cement according to a preset water-cement ratio, uniformly stirring to obtain mixed slurry, filtering the mixed slurry at least once to obtain filtrate, and pressurizing the filtrate by using a high-pressure pump to obtain high-pressure slurry.
It should be noted that the cement slurry is strictly prepared according to a preset proportion, and when in use, the caking in the cement needs to be screened in advance, so that the cement slurry can be prevented from being segregated, the cement slurry can be continuously stirred in a mixer, and the cement slurry is slowly poured into a hopper before being pressed.
Further, the cement is p.o42.5 portland cement.
Further, the water-cement ratio is 1-2.
Furthermore, at least three mutually independent conveying channels are arranged in the rotary spraying drill rod 1 along the length direction, and the outlet end of each conveying channel is positioned on the side wall of the bottom end of the rotary spraying drill rod 1; at least three nozzles are arranged on the side wall of the bottom end of the rotary spraying drill rod 1, and the outlet ends of the conveying channels are respectively connected with one nozzle; and respectively conveying high-pressure water, high-pressure slurry and compressed air into the nozzle through different conveying channels.
Further, the diameter of the nozzle is 3-5 mm.
Further, the step (i) further comprises: before drilling the foundation, preparation work before construction is carried out.
Further, the preparation work includes the steps of:
(1) Geological exploration and site cleaning: carrying out geological exploration and knowing the structural conditions of pipelines, buildings, structures and public facilities near the engineering, finishing the cleaning of a construction site, and carrying out early-stage preparation work such as electrifying, water flowing and the like;
(2) And (3) measuring and laying the pile position verticality: measuring the pile position construction axis of the jet grouting pile 4, determining whether the perpendicularity of the pile position construction axis reaches the standard, arranging a marker at the pile position, and positioning the pile position;
(3) Equipment installation and debugging: leveling and centering the drilling machine, debugging various compression pumps and confirming whether equipment runs normally; laying a pipeline, and checking whether a valve is normally opened; and (5) confirming the length of the jet grouting drill rod 1, carrying out a low-pressure water jet experiment, and checking whether the nozzle and the pressure are normal or not.
As shown in fig. 1, the complete process of the construction method provided by the present invention includes: geological exploration and site cleaning → measurement and layout of pile position verticality → full casing pilot hole (verticality inspection) → lower protective pipe 2 → pile driver in place → lower rotary spray drill rod 1 → high pressure water from top to bottom rotary spray → high pressure slurry and compressed air from bottom to top rotary spray → spray to complete formation of rotary spray pile 4 → cleaning of rotary spray drill rod 1 → movement to next pile position construction.
In another embodiment, the invention provides a high-pressure jet grouting parameter monitoring system device used in the construction method of the high-pressure jet grouting pile, the high-pressure jet grouting parameter monitoring system device comprises a data processing module, and a jet grouting detection module and a drilling detection module which are respectively and electrically connected to the data processing module, the drilling detection module is used for detecting the drilling depth, the rotation speed, the inclination angle and the moving speed of the jet grouting drill rod 1, and transmitting the detected data to the data processing module; the rotary spraying detection module is used for detecting the spraying pressure of the high-pressure slurry, the flow of the high-pressure slurry, the spraying pressure of the high-pressure water, the flow of the high-pressure water, the pressure of the compressed air and the flow of the compressed air, and transmitting the detected data to the data processing module.
The invention also provides a high-pressure jet grouting parameter monitoring system device, which is used for monitoring the parameters of the jet grouting state and the parameters of the drilling state in real time in the high-pressure jet grouting construction process so as to conveniently control the quality of the jet grouting pile 4, and meanwhile, is convenient for taking adjustment measures in time when abnormal conditions occur in the construction process so as to ensure the construction quality and the construction safety.
Further, the rotary spraying detection module comprises a slurry pressure sensor, a slurry flow meter, a water pressure sensor, a high-pressure water flow meter, an air pressure sensor and an air flow meter.
Further, the borehole detection module includes a distance sensor, a tilt sensor, and an angular velocity sensor.
In the present invention, the distance sensor functions to detect the penetration depth of the jet grouting pipe 1. The inclination angle sensor is used for detecting the inclination angle of the rotary spraying drill rod 1 relative to the vertical direction in the construction process. The dip angle sensor can selectively adopt a double-shaft dip angle sensor, the range of each shaft is +/-90 degrees, the dip angle sensor is arranged in the middle of the rotary spraying drill rod 1, the reference is that the rotary spraying drill rod 1 is vertical to the ground, and the dip angle sensor is horizontally arranged. After the installation is finished, the theodolite is used for calibrating the inclination angle sensor, after the initial position calibration is finished, the double-shaft inclination angle sensor can detect the offset of the axis of the jet grouting drill rod 1 in the vertical direction, and therefore the included angle between the jet grouting drill rod 1 and the vertical direction is obtained through calculation. The angular velocity sensor is used for detecting the rotating speed of the jet grouting drill rod 1 so as to ensure the pile body diameter and the pile forming quality of the jet grouting pile 4.
The data processing module in the invention is provided with a fault diagnosis program, and can analyze the detection results of the jet grouting detection module and the drilling detection module so as to carry out online fault monitoring and adjustment measure suggestion on the construction process.
It should be noted that the present invention does not specifically require or limit the structure of the detection elements such as the distance sensor, the tilt sensor, and the angular velocity sensor, and related devices that are disclosed in the prior art or are not disclosed in the new art can be used in the present invention.
Further, the data processing module comprises a controller, a display unit and an alarm unit, the controller is electrically connected with the rotary spraying detection module and the drilling detection module respectively, and the controller is electrically connected with the display unit and the alarm unit.
The data processing module provided by the invention also comprises a display unit which is used for displaying each state parameter processed by the data processing module in real time, so that an operator can intuitively master each state parameter in the current construction process in real time, and can take adjustment measures in time under abnormal conditions to ensure the engineering quality. Further preferably, the display unit may be provided with data analysis software inside, and the collected state parameters are displayed to the operator in a graphical or tabular form. In order to improve the practicability of the parameter monitoring system device, an alarm unit is additionally arranged in the data processing module, the current working state is subjected to overrun judgment according to the initial parameter range set by an operator, and an alarm is given when the acquired state parameter exceeds a set value so as to remind the operator to take safety measures in time. The display unit is also matched with input equipment, which comprises an operation panel with entity keys and/or touch screen keys and is used for an operator to input data, select different working modes, set the safe working range of parameters and the like.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein fall within the scope and disclosure of the present invention.
Claims (10)
1. A construction method of a high-pressure jet grouting pile is characterized by comprising the following steps:
drilling a foundation by a drilling machine, and vertically putting a protection pipe in the drilled hole;
(II) the pile machine leads a rotary spraying drill rod into a soil body from a protective pipe, high-pressure water and compressed air are sprayed into the soil body through the rotary spraying drill rod in a rotary mode, and the rotary spraying drill rod is vertically moved while being sprayed in a rotary mode, so that rotary spraying hole positions are formed in the soil body;
(III) switching high-pressure water into high-pressure slurry and compressed air, respectively and spirally spraying the high-pressure slurry and the compressed air into the rotary spraying hole position through a rotary spraying drill rod, and vertically moving the rotary spraying drill rod while spirally spraying to fully mix the slurry with the soil body to form the columnar solidified rotary spraying pile in the soil body.
2. The construction method of the high-pressure jet grouting pile according to claim 1, wherein in the step (I), the drilling machine is a full casing drilling machine;
preferably, the drilling machine leads a hole from the surface of the foundation to a position 3-5 m below the elevation of the pile top;
preferably, the outer diameter of the full casing adopted by the full casing drilling machine is 200-220 mm;
preferably, the inner diameter of a full casing adopted by the full casing drilling machine is 180-190 mm;
preferably, the inner diameter of the protective pipe is larger than the diameter of the rotary spraying drill rod, an annular cavity between the inner wall of the protective pipe and the outer wall of the rotary spraying drill rod forms a reverse slurry channel, and high-pressure slurry is discharged from the reverse slurry channel when the rotary spraying drill rod is in rotary spraying;
preferably, the inner diameter of the protective tube is 160-170 mm;
preferably, the outer diameter of the protective tube is 170-180 mm;
preferably, the diameter of the rotary spraying drill rod is 80-150 mm.
3. The construction method of the high-pressure jet grouting pile according to claim 1 or 2, wherein in the step (II), the jet grouting drill rod moves from top to bottom while jet grouting high-pressure water and compressed air, so that the jet grouting hole position is formed in a soil body;
preferably, the high-pressure water and the compressed air are respectively sprayed into the soil body in a rotating way through the rotating spray drill rod to dilute the soil body, so that the specific gravity of the soil body is reduced to 1300-1400 kg/m 3 ；
Preferably, the moving speed of the rotary spraying drill rod is 10-15 cm/min when high-pressure water and compressed air are sprayed in a rotary mode;
preferably, the injection pressure of the high-pressure water is 40-55 MPa;
preferably, the high-pressure water has the jet flow rate of 300-500L/min;
preferably, the rotating speed of the rotary spraying drill rod is 5-10 r/min.
4. The construction method of the high-pressure jet grouting pile according to any one of claims 1 to 3, wherein in the step (III), the jet grouting drill rod moves from the bottom of the jet grouting hole site to the top of the jet grouting hole site while jet grouting, so that soil in the jet grouting hole site is fully mixed with slurry;
preferably, the moving speed of the rotary spraying drill rod from the bottom of the rotary spraying hole to the rotary spraying hole is 5-10 cm/min;
preferably, the injection pressure of the high-pressure slurry is 30-40 MPa;
preferably, the flow rate of the high-pressure slurry is 300-400L/min;
preferably, the injection pressure of the compressed air is 0.7 to 1.5MPa;
preferably, the rotating speed of the rotary spraying drill rod is 5-10 r/min;
preferably, the rotary spraying drill rod vertically moves upwards to the top of the rotary spraying hole site after staying at the bottom of the rotary spraying hole site for a period of time;
preferably, the rotary spraying drill rod stays at the bottom of the rotary spraying hole for 1-5 min.
5. The method for constructing a high-pressure jet grouting pile according to any one of claims 1 to 4, wherein in the step (III), the high-pressure slurry is prepared by the following method:
mixing water and cement according to a preset water-cement ratio, uniformly stirring to obtain mixed slurry, filtering the mixed slurry at least once to obtain filtrate, and pressurizing the filtrate by using a high-pressure pump to obtain high-pressure slurry;
preferably, the cement is p.o42.5 portland cement;
preferably, the water-cement ratio is 1 to 2.
6. The construction method of the high-pressure jet grouting pile according to any one of claims 1-5, wherein at least two mutually independent conveying channels are arranged inside the jet grouting drill rod along the length direction, and the outlet ends of the conveying channels are positioned at the side wall of the bottom end of the jet grouting drill rod; at least two nozzles are arranged on the side wall of the bottom end of the rotary spraying drill rod, and the outlet ends of the conveying channels are respectively connected with one nozzle; respectively conveying high-pressure water, high-pressure slurry and compressed air into the nozzle through different conveying channels;
preferably, the nozzle has a diameter of 3 to 5mm.
7. The construction method of a high-pressure jet grouting pile according to any one of claims 1 to 6, wherein the step (I) further comprises: before drilling the foundation, carrying out preparation work before construction;
preferably, the preparation work includes the steps of:
(1) Geological exploration and site cleaning: carrying out geological exploration, knowing the structural conditions of pipelines, buildings, structures and public facilities nearby the engineering, removing bottom surface obstacles, finishing construction site cleaning, and flattening and hardening the construction site;
(2) And (3) measuring and laying the pile position verticality: measuring the pile position construction axis of the jet grouting pile, determining whether the perpendicularity of the pile position construction axis reaches the standard, arranging markers at the pile position, and positioning the pile position;
(3) Equipment installation and debugging: leveling and centering the pile machine, debugging various compression pumps, and determining whether equipment operates normally; laying a pipeline, and checking whether a valve is normally opened; and (5) confirming the length of the jet grouting drill rod, carrying out a low-pressure water jetting experiment, and checking whether the nozzle and the pressure are normal.
8. A high-pressure jet grouting parameter monitoring system device used in the construction method of the high-pressure jet grouting pile according to any one of claims 1 to 7, wherein the high-pressure jet grouting parameter monitoring system device comprises a data processing module, and a jet grouting detection module and a drilling detection module which are respectively and electrically connected with the data processing module, wherein the drilling detection module is used for detecting the drilling depth, the rotating speed, the inclination angle and the moving speed of a jet grouting drill rod and transmitting the detected data to the data processing module; the rotary spraying detection module is used for detecting the spraying pressure of the high-pressure slurry, the flow rate of the high-pressure slurry, the spraying pressure of the high-pressure water, the flow rate of the high-pressure water, the pressure of the compressed air and the flow rate of the compressed air, and transmitting the detected data to the data processing module.
9. The high-pressure jet grouting parameter monitoring system device according to claim 8, wherein the jet grouting detection module comprises a slurry pressure sensor, a slurry flow meter, a water pressure sensor, a high-pressure water flow meter, an air pressure sensor and an air flow meter;
preferably, the borehole detection module comprises a distance sensor, a tilt sensor and an angular velocity sensor.
10. The high-pressure jet grouting parameter monitoring system device according to claim 8 or 9, wherein the data processing module comprises a controller, a display unit and an alarm unit, the controller is electrically connected with the jet grouting detection module and the drilling detection module respectively, and the controller is electrically connected with the display unit and the alarm unit.
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| 中华人民共和国住房和城乡建设部: "上海轨道交通12号线工程关键技术研究与应用", 中国铁道出版社, pages: 167 - 168 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420810A (en) * | 2023-12-19 | 2024-01-19 | 中铁三局集团广东建设工程有限公司 | Multi-mode data processing method and device for high-pressure jet grouting pile control |
| CN117420810B (en) * | 2023-12-19 | 2024-03-12 | 中铁三局集团广东建设工程有限公司 | Multi-mode data processing method and device for high-pressure jet grouting pile control |
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