CN113235581A - Construction method of double-liquid rapid-hardening high-pressure jet grouting pile - Google Patents
Construction method of double-liquid rapid-hardening high-pressure jet grouting pile Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 81
- 239000007788 liquid Substances 0.000 title claims abstract description 47
- 239000004568 cement Substances 0.000 claims abstract description 111
- 239000002002 slurry Substances 0.000 claims abstract description 89
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 83
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 83
- 238000005553 drilling Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000000243 solution Substances 0.000 claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 49
- 238000005507 spraying Methods 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 9
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 8
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 8
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 241001330002 Bambuseae Species 0.000 claims description 7
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- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000007865 diluting Methods 0.000 claims description 5
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- 230000004888 barrier function Effects 0.000 claims description 4
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- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 21
- 239000011440 grout Substances 0.000 abstract description 18
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 13
- 230000002787 reinforcement Effects 0.000 description 9
- 239000002689 soil Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
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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
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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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
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
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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
- E21B7/00—Special methods or apparatus for drilling
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/02—Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting
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Abstract
The invention discloses a construction method of a double-liquid quick-setting high-pressure jet grouting pile, which comprises the steps of pile position determination, clearing and removing obstacles, drilling machine debugging, drilling machine positioning, drilling to a designed depth, cement paste mixing, water glass preparation, double-liquid high-pressure jet grouting, injection grouting completion, next pile moving and the like, compared with the traditional common jet grouting pile construction process, the invention respectively ejects cement paste and water glass through two nozzles below a multifunctional full-hydraulic drilling rod machine through a pump body, then ejects the cement paste and the water glass solution from the nozzles at the bottom of the multifunctional full-hydraulic drilling rod, and rotates, stirs and mixes at the bottom of the pile position, thereby realizing the quick-setting pile forming of the cement paste, solving the problem that the conventional jet grouting pile cannot be formed on the existing ground surface, and enabling the grout to quickly form the pile, effectively form the pile and have very short pile forming time through the construction method of the invention, and the fluidity of the slurry is weak, the dosage of the cement slurry is less, the dosage of the slurry is saved, and the blockage of underground pipelines is avoided.
Description
Technical Field
The invention relates to the technical field of construction of constructional engineering, in particular to a construction method of a double-hydraulic quick-setting high-pressure jet grouting pile applied to emergency rescue, leaking stoppage and quick reinforcement of underground engineering and reinforcement of weak foundations with extremely unstable underground water.
Background
The rotary jet grouting method is developed in the 70 th 20 th century by introducing hydraulic coal mining technology on the basis of static pressure grouting, and is characterized by cutting and mixing stratum by utilizing jet flow action, changing the structure and composition of original stratum, and simultaneously injecting cement paste to form concretion so as to attain the goal of reinforcing foundation.
Ordinary jet grouting pile spouts grout into the soil layer with the rotatory nozzle of high pressure and mixes with the soil body, forms continuous lapped cement and adds the solid to consolidate to the earth's surface, but ordinary jet grouting pile has some defects:
(1) because the cement slurry after the rotary spraying construction has stronger fluidity and is in a flowable slurry state, the time required for achieving initial setting is longer and at least needs 1 day, and because the slurry fluidity of a common rotary spraying pile is stronger, the cement slurry has more consumption, and the cost and the resource are more consumed;
(2) the common rotary spraying pile has serious dust pollution and blockage of underground pipelines in the rotary spraying process;
(3) because the solidification time of the rotary spraying technology is long, the slurry can not be quickly solidified, so that the emergency plugging effect can not be well achieved, and the slurry is seriously lost;
(4) when the underground soil layer has flowing water, the ordinary rotary spraying technology can not be used in the soil layer with flowing underground water, because the slurry has strong mobility, and in addition, the underground water flows, so the slurry is influenced by the tension of ebb and flow tide, the cement slurry can run off, and the problems of serious slurry leakage and slurry leakage occur, thereby causing the problem that the foundation cannot be reinforced or the water of a curtain cannot be stopped finally.
In the prior art, the physical property of the original soil body is changed by adopting a WSS grouting process, and the WSS grouting process adopts a drilling machine to perform deep hole grouting reinforcement so as to achieve the purpose of reinforcing the foundation, but the WSS grouting process also has some defects and problems:
(1) the grout in the traditional WSS grouting process is relatively dispersive, so that uniform pile forming is difficult;
(2) in the traditional WSS grouting process, the pressure of slurry is limited, a drill rod is easy to lock, and the working efficiency is very low;
(3) in the traditional WSS grouting process, the grout is synchronous, so that the grout is wasted;
(4) in the traditional WSS grouting process, multiple kinds of grout are frequently adopted for grouting, so that pipe plugging and drill burying often occur;
(5) as slurry discharging of the pump in the traditional WSS grouting process is synchronous, the maximum pressure of a pipeline is not more than 5Mpa, power is insufficient, the pump is easy to cause problems, and the pump is not suitable for waterproof curtain construction in a flowing water area.
Therefore, it is desired to provide a construction method which can quickly solidify the grout into a pile under the condition of underground flowing water flow, can simultaneously feed water glass cement paste and the like into a water gushing leakage point, and quickly finish emergency plugging or reinforcement.
Disclosure of Invention
Aiming at the defects that the common jet grouting pile in the prior art is difficult to form under the condition of flowing water underground, the grout solidification time is long, the grout fluidity is strong, the grout is seriously wasted, a drill rod is easily locked by a WSS grouting process, the working efficiency is very low, the grout is in a dispersed type and is difficult to form the pile in the common jet grouting construction process and the like, the invention aims to solve the technical problem of providing a jet grouting pile which adopts water glass and grout according to the ratio of 2: the grout is sprayed out according to the proportion of 1, the grout can be solidified into a pile within 2 minutes after being mixed, the construction time is saved, the waste of the grout is avoided, the raw materials are saved, and the double-hydraulic quick-setting high-pressure jet grouting pile adopts a multifunctional large-scale drilling machine, has enough power, and effectively solves the problems of buried drilling and the like caused by quick setting of the grout.
In order to solve the technical problem, the invention provides a construction method of a double-hydraulic quick-setting high-pressure jet grouting pile, which comprises the following construction steps:
step 1) pile position determination: measuring the construction axis of the double-liquid rapid-hardening high-pressure jet grouting pile through distance measuring systems such as a total station and a level gauge, performing re-checking and line checking, laying the pile positions by using a steel ruler and the axis after the construction axis is qualified, nailing the pile positions by using bamboo, wherein each pile position corresponds to one bamboo, so that the displacement deviation of the center of a pile hole is smaller than 20mm, and the measurement of the pile positions is completed;
step 2), clearing and removing obstacles: excavating and cleaning overground and underground barriers and the like on a construction site, arranging a slurry discharge ditch and the like, and moving and modifying pipelines to be moved and modified so as to ensure the smoothness of a construction site;
step 3) debugging of a drilling machine: debugging the drill rod of a multifunctional full-hydraulic drill rod machine with the model of GL6000S, connecting a matched circuit pipeline and the like, testing whether the running state of a pump body is normal or not, fastening each screw in the mechanical installation and debugging stage, and putting the screw into a test pile or a pile forming operation after carefully inspecting each part;
step 4), positioning a drilling machine: leveling and centering the double-hydraulic quick-setting high-pressure jet grouting pile to ensure that the deviation of a drill rod and a pile position of the multifunctional full-hydraulic drill rod machine is not more than 5cm, debugging the frequency of a slurry stirring machine and a variable-frequency high-pressure pump, and confirming that the slurry stirring machine and the variable-frequency high-pressure pump normally operate;
step 5), drilling to a designed depth: checking the length of a drill rod of the multifunctional full-hydraulic drilling machine, determining the elevation of the pile top and the pile bottom, spraying water and drilling holes to enable the elevation of the drill bottom to meet the preset depth, performing a low-pressure water injection experiment, and checking whether two nozzles and pressure of a grouting pipe are normal or not;
step 6), cement paste mixing: mixing water and cement according to a preset water cement ratio, uniformly stirring by using a stirrer to obtain a mixture, and filtering the mixture by using a screen to obtain target slurry-cement slurry;
step 7) preparing water glass: diluting with water and water glass to obtain water glass solution, wherein the concentration of the water glass solution is 9-25 Be;
step 8), double-liquid high-pressure rotary spraying: mixing cement slurry and water glass according to a certain ratio of 2:1 through a drill rod grouting pipe, and pumping the cement slurry and the water glass slurry through a pump body of a double-liquid quick-setting high-pressure jet grouting pile by a variable-frequency high-pressure pump at the pressure of 20-30 MPa;
and step 9) finishing injection grouting: the double-liquid rapid-hardening high-pressure jet grouting pile is characterized in that cement paste and water glass are mixed according to the weight ratio of 2: after the cement slurry and the water glass solution are sprayed out from two nozzles at the bottom of the drill rod according to the proportion of 1, the cement slurry and the water glass solution are stirred, mixed and solidified at the bottom of a pile position in a rotating mode, so that the cement slurry is quickly solidified into a pile, and the construction of one pile is completed.
Preferably, the constructing step further comprises:
step 10), moving the next pile: and after the double-hydraulic quick-setting high-pressure jet grouting pile completes one pile, continuously moving the multifunctional full-hydraulic drilling machine to the next pile position, and repeating the steps 6-10 to construct the next pile.
Preferably, the machine head of the multifunctional full-hydraulic drill rod machine in the step 3 is set to rotate at 360 degrees without dead angle so as to facilitate construction at a narrow position during emergency rescue, and when a high-speed power head is selected for the multifunctional full-hydraulic drill rod machine, the rotating speed of the power head comprises: the low speed is 8-275r/min, the high speed is 16-550r/min, the torque of a power head of the multifunctional full-hydraulic drill rod machine is 6000N.m-3000N.m, the travel of the power head is 3000mm, and the power of the multifunctional full-hydraulic drill rod machine is larger, so that the problems of drill holding, drill burying and the like caused by rapid hardening in operation can be prevented.
Preferably, the specification of the drill rod in the step 9 is phi 60-phi 89 × 2500mm, so as to prevent the drill rod from being broken due to excessive torque during liquid spraying, the drill rod is provided with a high-strength sealing gasket, and when the previous drill rod is sprayed completely and the drill rod needs to be disassembled, the residual double liquid in the drill rod must be flushed out of the nozzle by using clear water.
Preferably, the preset water-cement ratio in step 6 is 1:1, P.O42.5 ordinary portland cement is adopted as the cement, the cement is stirred by the stirrer for 2-5 minutes, and cement paste obtained after stirring and filtering by the stirrer is poured into a paste barrel.
Preferably, the dual-hydraulic rapid hardening high-pressure jet grouting pile in the step 8 adopts a dual-pipe method, a pump body of the dual-hydraulic rapid hardening high-pressure jet grouting pile is a variable-frequency high-pressure pump, the multifunctional full-hydraulic drill pipe machine drills a grouting pipe with two nozzles to a preset depth position of a drilled hole, when the grouting pipe reaches the preset depth, the variable-frequency high-pressure pump respectively conveys the cement slurry obtained by stirring in the step 6 and the water glass obtained by modulation in the step 7 into the grouting pipe, the two nozzles at the bottom of the multifunctional full-hydraulic drill pipe machine are respectively used for carrying out jet operation by respectively carrying out jet grouting and water glass jet spraying, and the multifunctional drill pipe machine drives the nozzles to rotate and lift from bottom to top.
Preferably, the pump body of the double-hydraulic rapid-hardening high-pressure jet grouting pile in the step 8 is a three-cylinder separation pump body, wherein the two cylinders discharge cement paste, the one cylinder discharges water glass, cement paste and water glass are finally respectively sprayed out through two spray heads of a grouting pipe below the multifunctional full-hydraulic drilling rod machine through the pump body, the cement paste and the water glass solution sprayed out from the two spray heads are rotationally stirred and mixed at the bottom of the pile position through a drilling rod of the multifunctional full-hydraulic drilling rod machine and are lifted upwards at a certain speed to realize rapid-hardening pile forming of the cement paste, and the time required by rapid-hardening pile forming of the cement paste and the water glass is less than 2 minutes.
Preferably, the double-liquid rapid-hardening high-pressure jet grouting pile adopts a double-nozzle special drill bit which is respectively arranged at the bottom of the multifunctional full-hydraulic drill pipe machine so as to avoid drill blockage.
Preferably, the rotating speed of the double-nozzle special drill bit for spraying cement paste and water glass is 5-25cm/min, and the lifting speed of the multifunctional full-hydraulic drill rod machine for driving the nozzles to lift upwards is 10-25 cm/min.
Preferably, two pressure gauges are installed above the variable-frequency high-pressure pump, the pressure of each pressure gauge can reach 30MPa, safety valves are further installed on two sides of the variable-frequency high-pressure pump, and when the pressure in the variable-frequency high-pressure pump exceeds 45MPa, the safety valves can automatically open to release pressure.
Compared with the prior art, the scheme of the invention at least comprises the following beneficial effects:
(1) the invention relates to a construction method of a double-liquid quick-setting high-pressure jet grouting pile, which comprises the construction steps of pile position determination, clearing and obstacle removing, drilling machine debugging, drilling machine positioning, drilling to the designed depth, cement paste mixing, water glass preparation, double-liquid high-pressure jet grouting, injection grouting completion, next pile moving and the like, compared with the traditional common jet grouting pile construction process, the invention respectively ejects cement paste and water glass through two nozzles below a full-hydraulic drilling rod machine through a pump body, and the proportion of the ejected cement paste to the water glass is 2: the invention relates to a construction method of a cement paste rotary jet grouting pile, which comprises the following steps of 1, rotationally stirring and mixing cement paste sprayed from two spray heads and a water glass solution at the bottom of a pile position, thereby realizing the quick setting pile formation of the cement paste, wherein the time required by the quick setting pile formation of the cement paste and the water glass solution is less than 2 minutes, greatly improving the construction efficiency, solving the problem that the conventional rotary jet grouting pile with flowing water on the ground surface can not form the pile.
(2) The construction method of the double-liquid rapid-hardening high-pressure jet grouting pile adopts a multifunctional full-hydraulic drilling machine, a double-nozzle special drill bit and a three-cylinder separation pump body, water glass and cement paste are respectively sprayed out by the double-nozzle special drill bit and then are simultaneously sent to a water gushing leakage point, then the rapid-hardening pile is formed, emergency leakage plugging or reinforcement is rapidly completed, the leakage plugging effect is good, repeated gushing and leakage cannot occur, fixed-point positioning reinforcement can be realized, the waste and loss of raw materials such as the water glass and the cement paste are reduced, the cost is greatly saved, the problem of blockage of public facilities such as underground pipelines and the like caused by the loss of the cement paste is solved, and the blockage and the damage of the underground pipeline facilities which are difficult to avoid in the traditional grouting construction are solved.
(3) The double-liquid rapid-hardening high-pressure jet grouting pile overcomes the defects of jet grouting piles and WSS double-liquid grouting reinforcement in the prior art, breaks through the defects of the traditional construction processes, quickly and effectively solves the problem of water burst and sand gushing in underground engineering construction, saves the construction time of various emergency plugging projects, saves the waste of raw materials in the construction process, and reduces the construction pollution to the maximum extent.
(4) The double-liquid rapid-hardening high-pressure jet grouting pile adopts a double-nozzle special drill bit, double-liquid slurry is sprayed out by the double-nozzle special drill bit, and the double-liquid slurry is rotationally mixed after being sprayed out, so that the problem that the traditional single-nozzle drill bit for jet grouting is easy to block a drill is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a schematic diagram of the construction steps of a double hydraulic quick-setting high-pressure jet grouting pile of the invention;
FIG. 2 is a schematic diagram illustrating the effect of the construction method of the double-hydraulic-rapid-hardening high-pressure jet grouting pile of the present invention;
fig. 3 is a schematic view of construction effect of a general jet grouting pile in a conventional process.
In the figure, a multifunctional full-hydraulic drill rod machine 1, a slurry stirring machine 2, a variable-frequency high-pressure pump 3, a screen 4, a nozzle 5, a slurry barrel 6, a grouting pipe 7 and a slurry suction pipe 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the invention provides a construction step diagram of a double-hydraulic-rapid-hardening high-pressure jet grouting pile, which specifically comprises the following steps:
step 1) pile position determination: measuring the construction axis of the double-liquid rapid-hardening high-pressure jet grouting pile through distance measuring systems such as a total station and a level gauge, performing re-checking and line checking, laying the pile positions by using a steel ruler and the axis after the construction axis is qualified, nailing the pile positions by using bamboo, wherein each pile position corresponds to one bamboo, so that the displacement deviation of the center of a pile hole is smaller than 20mm, and the measurement of the pile positions is completed;
step 2), clearing and removing obstacles: excavating and cleaning overground and underground barriers and the like on a construction site, arranging a slurry discharge ditch and the like, and moving and modifying pipelines to be moved and modified so as to ensure the smoothness of a construction site;
step 3) debugging of a drilling machine: debugging the drill rod of the multifunctional full-hydraulic drill rod machine 1 with the model of GL6000S, connecting a matched circuit pipeline and the like, testing whether the running state of a pump body is normal or not, fastening each screw in the mechanical installation and debugging stage, and after carefully inspecting each part, putting the part into pile testing or pile forming operation;
step 4), positioning a drilling machine: leveling and centering the double-hydraulic quick-setting high-pressure jet grouting pile to ensure that the deviation between a drill rod and a pile position of the multifunctional full-hydraulic drill rod machine 1 is not more than 5cm, debugging the frequency of the slurry stirring machine 2 and the frequency conversion high-pressure pump 3 and confirming that the slurry stirring machine 2 and the frequency conversion high-pressure pump 3 normally operate;
step 5), drilling to a designed depth: checking the length of a drill rod of the multifunctional full-hydraulic drill rod machine 1, determining the elevation of the pile top and the pile bottom, spraying water for drilling, enabling the elevation of the drill bottom to meet the preset depth, performing a low-pressure water injection experiment, and checking whether two nozzles 5 and the pressure of a grouting pipe 7 are normal or not;
step 6), cement paste mixing: mixing water and cement according to a preset water cement ratio, uniformly stirring by using a stirrer to obtain a mixture, and filtering the mixture by using a screen 4 to obtain target slurry-cement slurry;
step 7) preparing water glass: diluting with water and water glass to obtain water glass solution, wherein the concentration of the water glass solution is 9-25 Be;
step 8), double-liquid high-pressure rotary spraying: mixing cement slurry and water glass according to a certain ratio of 2:1 through a drill rod grouting pipe 7, and pumping the cement slurry and the water glass slurry through a pump body of a double-liquid quick-setting high-pressure jet grouting pile by a variable-frequency high-pressure pump 3 at the pressure of 20-30 MPa;
and step 9) finishing injection grouting: the double-liquid rapid-hardening high-pressure jet grouting pile is characterized in that cement paste and water glass are mixed according to the weight ratio of 2: after the cement slurry and the water glass solution are sprayed out from the two nozzles 5 at the bottom of the drill rod according to the proportion of 1, the cement slurry and the water glass solution are stirred, mixed and solidified at the bottom of the pile position in a rotating mode, so that the cement slurry is quickly solidified into a pile, and the construction of one pile is completed.
Step 10), moving the next pile: and after the double-hydraulic quick-setting high-pressure jet grouting pile completes one pile, continuously moving the multifunctional full-hydraulic drilling machine 1 to the next pile position, and repeating the steps 6-10 to construct the next pile.
As shown in figure 2, the construction method of the double-liquid quick-setting high-pressure jet grouting pile is a schematic effect diagram, the problem that common jet grouting piles are difficult to form piles in the region close to seaside and river side where the underground water level is extremely unstable due to the influence of tide water can be solved through the construction method of the invention, the construction method of the invention is very suitable for reinforcing treatment of weak foundation with extremely unstable underground water or water stop pile construction, and the construction method of the double-liquid quick-setting high-pressure jet grouting pile can quickly solidify piles, because the sprayed water glass and cement paste can be quickly solidified together through rotary stirring, the reinforcing or water stop effect is achieved, and the adverse effect caused by unstable underground water level can be effectively solved.
As shown in fig. 3, the construction effect of the conventional ordinary jet grouting pile is shown, and the conventional ordinary jet grouting pile has a strong slurry fluidity, so that when flowing water exists in an underground soil layer, the ordinary jet grouting technology cannot be used in a soil layer in which underground water flows, and because the slurry fluidity is strong and the underground water flows, the slurry is affected by the tension of ebb and flow, the cement slurry is lost, and serious slurry leakage and slurry leakage problems occur, and the pile cannot be formed.
In addition, the construction method of the double-liquid rapid-hardening high-pressure jet grouting pile adopts cement paste and water glass slurry as grouting materials, can reduce the setting time of the cement paste, prevent the cement paste from being eroded by underground water and being not easy to be solidified, can obviously improve the water plugging and seepage preventing performance of a jet grouting solidified body, is also very suitable for underground construction of emergency rescue, leakage stoppage, rapid reinforcement and the like of underground engineering, is suitable for rapid emergency repair reinforcement of various forms of water leakage and sand gushing among piles of supporting piles, underground continuous walls, open caisson and the like, and can rapidly stop leakage of water leakage and sand gushing, and avoid dangerous situations of overlarge foundation pit deformation, ground collapse and the like caused by long-time gushing.
Specifically, the head of the multifunctional full-hydraulic drill rod machine 1 in the construction step 3 is set to rotate at 360 degrees without dead angles, so that the design is mainly to facilitate construction at narrow positions in emergency, the multifunctional full-hydraulic drill rod machine 1 adopts a high-speed power head, the rotating speed of the power head is 8-275r/min at low speed and 16-550r/min at high speed, the torque of the power head is 6000N.m-3000N.m, the travel of the power head is 3000mm, the power ratio of the multifunctional full-hydraulic drill rod machine 1 is large, and the problems of drill holding and drill burying caused by rapid hardening can be effectively prevented.
Specifically, the specification of the drill rod in the construction step 9 is phi 60-phi 89 multiplied by 2500mm, the drill rod with high quality specification of phi 60-phi 89 is adopted, the drill rod fracture caused by overlarge torque can be avoided, the drill rod is padded with the high-strength sealing gasket, the sealing performance of the drill rod is enhanced, and when the drill rod needs to be disassembled after the previous drill rod is sprayed, the residual double liquid in the drill rod needs to be flushed out of the nozzle 5 by clear water.
When the embodiment of the invention is specifically realized, the water-cement ratio preset in the construction step 6 of the invention is 1:1, wherein P.O42.5 ordinary portland cement is adopted as cement, cement is stirred by a stirrer for 2-5 minutes, cement paste obtained after stirring and filtering by the stirrer is poured into a paste barrel 6, hard cement blocks can be removed by a screen 4, the temperature of the filtered cement paste is controlled between 5-40 ℃, and when the temperature of the cement paste exceeds 45 ℃, waste paste treatment is required and the cement paste cannot be used; the storage time of the cement slurry is not more than 3 hours when the air temperature is more than 10 ℃, the storage time of the cement slurry is not more than 5 hours when the air temperature is less than 10 ℃, and the storage time exceeds the aging period, so that the cement slurry is treated as waste slurry and cannot be used.
The invention has the advantages that the water-cement ratio is fixed to be 1:1, diluting water glass to obtain different water glass concentrations, and the solidification time relations of emergency, plugging, reinforcing and soft foundation treatment are shown in the following table 1:
TABLE 1
Mixing ratio of slurry
In table 1, the modulus of water glass is generally between 2.4 and 3.3, the concentration of water glass after water glass is diluted in an aqueous solution is represented by baume degree Be, the density of common water glass is generally 1.36 to 1.50, which is equivalent to baume degrees 38.4 to 48.3, the higher the density is, the higher the content of water glass in the aqueous solution is, the higher the viscosity is, and it can Be seen from the table that the higher the content of water glass in the aqueous solution after water glass is diluted is, the longer the setting time is.
In the concrete implementation of the invention, the double-hydraulic rapid hardening high-pressure jet grouting pile in the construction step 8 adopts a double-pipe method, wherein a pump body of the double-hydraulic rapid hardening high-pressure jet grouting pile is a variable-frequency high-pressure pump 3, the variable-frequency high-pressure pump 3 adopts a three-cylinder separation pump body, two cylinders discharge cement paste and one cylinder discharge water glass, wherein the mixing ratio of the cement paste and the water glass is 2: the rapid setting effect is the best at 1 hour, which is obtained through a plurality of experiments, as shown in table 1, the cement and the water glass reach the best effect when mixed at 2:1 in the same proportion, the setting speed is high, the strength is high, raw materials are saved, and the synchronous effect is better than that of the traditional WSS grouting 1:1 double-cylinder synchronous effect.
In the construction step 8 of the invention, the multifunctional full hydraulic drilling machine 1 drills the grouting pipe 7 with two nozzles 5 into the preset depth position of the drilled hole, when the grouting pipe 7 reaches the preset depth of drilling, the frequency conversion high-pressure pump 3 respectively conveys the cement paste obtained by stirring in the step 6 and the water glass obtained by modulation in the step 7 into the grouting pipe 7, under the action of the frequency conversion high-pressure pump 3, grout and water glass are respectively sprayed by two nozzles 5 at the bottom of the multifunctional full-hydraulic drill rod machine 1 in a rotating way, the multifunctional full-hydraulic drill rod machine 1 drives the two nozzles 5 to rotate and lift from bottom to top for spraying operation, the grout and the water glass solution sprayed from the two spray heads are mixed at the bottom of a pile position by the drill rod of the multifunctional full-hydraulic drill rod machine 1 in a rotating way, and lifting upwards at a certain speed to realize quick setting of cement paste to form the pile, wherein the time required by the quick setting of the cement paste and the water glass is less than 2 minutes.
The double-liquid rapid hardening high-pressure jet grouting pile adopts the double-nozzle special drill bit, double-liquid slurry is sprayed out by the double-nozzle special drill bit, and the double-liquid slurry is rotationally mixed after being sprayed out, so that the problem that the traditional single-nozzle drill bit for jet grouting is easy to block a drill can be solved.
The rotating speed of the special drill bit with the double nozzles for spraying cement paste and water glass is 5-25cm/min, and the lifting speed of the multifunctional full-hydraulic drill rod machine 1 for driving the nozzles 5 to lift upwards is 10-25 cm/min.
In summary, the comparative conditions between the construction process of the dual-hydraulic rapid-hardening high-pressure jet grouting pile and the conventional process are shown in table 2
TABLE 2
The advantages and disadvantages of the traditional process are compared with those of the double-liquid rapid-hardening high-pressure jet grouting pile
The advantages and disadvantages of the traditional process are compared with those of the double-liquid rapid-hardening high-pressure jet grouting pile
Example 1:
the construction process of the quick-setting pile of the double-liquid quick-setting high-pressure jet grouting pile comprises the following steps:
step 1) pile position determination: measuring the construction axis of the double-hydraulic-rapid-hardening high-pressure jet grouting pile through a leveling instrument ranging system, performing re-checking line, after the construction axis is qualified, laying pile positions by using a steel ruler and the axis and nailing the pile positions by using bamboos, wherein each pile position corresponds to one bamboo, so that the central displacement deviation of a pile hole is smaller than 20mm, and the measurement of the pile positions is completed;
step 2), clearing and removing obstacles: excavating and cleaning overground and underground barriers and the like on a construction site, arranging a slurry discharge ditch, and moving and modifying pipelines to be moved and modified so as to ensure the smoothness of the construction site;
step 3) debugging of a drilling machine: debugging the drill rod of the multifunctional full-hydraulic drill rod machine 1 with the model of GL6000S, connecting a matched circuit pipeline and the like, testing whether the running state of a pump body is normal or not, fastening each screw in the mechanical installation and debugging stage, and after carefully inspecting each part, putting the part into pile testing or pile forming operation;
step 4), positioning a drilling machine: leveling and centering the double-hydraulic quick-setting high-pressure jet grouting pile to ensure that the deviation between a drill rod and a pile position of the multifunctional full-hydraulic drill rod machine 1 is not more than 5cm, debugging the frequency of the slurry stirring machine 2 and the frequency conversion high-pressure pump 3 and confirming that the slurry stirring machine 2 and the frequency conversion high-pressure pump 3 normally operate;
step 5), drilling to a designed depth: checking the length of a drill rod of the multifunctional full-hydraulic drill rod machine 1, determining the elevation of the pile top and the pile bottom, spraying water for drilling, enabling the elevation of the drill bottom to meet the preset depth, performing a low-pressure water injection experiment, and checking whether two nozzles 5 and the pressure of a grouting pipe 7 are normal or not;
step 6), cement paste mixing: according to the water-cement ratio of 1:1, mixing water and cement, adding water, then adding the cement, uniformly stirring by using a stirrer to obtain a mixture, and filtering the mixture by using a screen 4 to obtain target slurry-cement slurry;
step 7) preparing water glass: diluting water and water glass to obtain a water glass solution, wherein the concentration of the water glass solution is 25 Be;
step 8), double-liquid high-pressure rotary spraying: mixing cement slurry and water glass according to a certain ratio of 2:1 through a drill rod grouting pipe 7, respectively conveying the cement slurry and the water glass into a slurry suction pipe 8 of the grouting pipe 7 through a variable-frequency high-pressure pump 3, and pumping the cement slurry and the water glass slurry out through a pump body of the double-liquid rapid-setting high-pressure jet grouting pile through the variable-frequency high-pressure pump 3 at a pressure of 30 MPa;
and step 9) finishing injection grouting: the double-liquid rapid-hardening high-pressure jet grouting pile is characterized in that cement paste and water glass are mixed according to the weight ratio of 2:1, after the cement slurry and the water glass solution are sprayed out from two nozzles 5 at the bottom of the drill rod in proportion, the cement slurry and the water glass solution are stirred, mixed and solidified at the bottom of a pile position in a rotating mode, so that the cement slurry is quickly solidified into a pile, and the construction of one pile is completed;
step 10), moving the next pile: and after the double-hydraulic quick-setting high-pressure jet grouting pile completes one pile, continuously moving the multifunctional full-hydraulic drilling machine 1 to the next pile position, and repeating the steps 6-10 to construct the next pile.
Example 2:
according to the invention, two pressure gauges are arranged above the variable-frequency high-pressure pump 3, wherein the pressure of the pressure gauge can reach 30MPa, safety valves are arranged on two sides of the variable-frequency high-pressure pump 3, when grouting is carried out, when the pressure in the variable-frequency high-pressure pump 3 exceeds 45MPa, the safety valves can be automatically opened to release pressure, so that the function of protecting equipment is achieved, a background operator needs to allocate the proportion of water glass and cement according to the field requirement before grouting, grouting is started after an experiment is carried out, the flow velocity conditions of the pressure gauge and a slurry suction pipe 8 are observed, the slurry suction pipe 8 needs to adopt a transparent steel wire corrugated pipe, so that the condition of slurry in the slurry suction pipe 8 is observed, and the condition needs to be immediately communicated with a foreground operator and quickly processed.
Example 3:
the rapid hardening pile of the double-liquid rapid hardening high-pressure jet grouting pile can be applied to horizontal strengthening before tunnel portal breaking, the horizontal meshing strengthening at the top of the tunnel can be safer, dangerous situations such as vault water leakage and collapse caused by tunnel breaking are avoided, if special strata such as quicksand meet, construction is carried out after an anti-backflow flange device is installed at each hole opening, and the safety during tunnel breaking is convenient after horizontal high-pressure rapid piling strengthening is carried out in the middle of a pipe shed if the grouting effect is poor and the portal breaking cannot be smoothly carried out.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A construction method of a double-hydraulic quick-setting high-pressure jet grouting pile is characterized by comprising the following steps: the method comprises the following construction steps:
step 1) pile position determination: measuring the construction axis of the double-liquid rapid-hardening high-pressure jet grouting pile through distance measuring systems such as a total station and a level gauge, performing re-checking and line checking, laying the pile positions by using a steel ruler and the axis after the construction axis is qualified, nailing the pile positions by using bamboo, wherein each pile position corresponds to one bamboo, so that the displacement deviation of the center of a pile hole is smaller than 20mm, and the measurement of the pile positions is completed;
step 2), clearing and removing obstacles: excavating and cleaning overground and underground barriers and the like on a construction site, arranging a slurry discharge ditch and the like, and moving and modifying pipelines to be moved and modified so as to ensure the smoothness of a construction site;
step 3) debugging of a drilling machine: debugging the drill rod of a multifunctional full-hydraulic drill rod machine with the model of GL6000S, connecting a matched circuit pipeline and the like, testing whether the running state of a pump body is normal or not, fastening each screw in the mechanical installation and debugging stage, and putting the screw into a test pile or a pile forming operation after carefully inspecting each part;
step 4), positioning a drilling machine: leveling and centering the double-hydraulic quick-setting high-pressure jet grouting pile to ensure that the deviation of a drill rod and a pile position of the multifunctional full-hydraulic drill rod machine is not more than 5cm, debugging the frequency of a slurry stirring machine and a variable-frequency high-pressure pump, and confirming that the slurry stirring machine and the variable-frequency high-pressure pump normally operate;
step 5), drilling to a designed depth: checking the length of a drill rod of the multifunctional full-hydraulic drilling machine, determining the elevation of the pile top and the pile bottom, spraying water and drilling holes to enable the elevation of the drill bottom to meet the preset depth, performing a low-pressure water injection experiment, and checking whether two nozzles and pressure of a grouting pipe are normal or not;
step 6), cement paste mixing: mixing water and cement according to a preset water cement ratio, uniformly stirring by using a stirrer to obtain a mixture, and filtering the mixture by using a screen to obtain target slurry-cement slurry;
step 7) preparing water glass: diluting with water and water glass to obtain water glass solution, wherein the concentration of the water glass solution is 9-25 Be;
step 8), double-liquid high-pressure rotary spraying: mixing cement slurry and water glass according to a certain ratio of 2:1 through a drill rod grouting pipe, and pumping the cement slurry and the water glass slurry through a pump body of a double-liquid quick-setting high-pressure jet grouting pile by a variable-frequency high-pressure pump at the pressure of 20-30 MPa;
and step 9) finishing injection grouting: the double-liquid rapid-hardening high-pressure jet grouting pile is characterized in that cement paste and water glass are mixed according to the weight ratio of 2: after the cement slurry and the water glass solution are sprayed out from two nozzles at the bottom of the drill rod according to the proportion of 1, the cement slurry and the water glass solution are stirred, mixed and solidified at the bottom of a pile position in a rotating mode, so that the cement slurry is quickly solidified into a pile, and the construction of one pile is completed.
2. The construction method of the double-hydraulic-quick-setting high-pressure jet grouting pile according to claim 1, characterized in that: the construction step further comprises:
step 10), moving the next pile: and after the double-hydraulic quick-setting high-pressure jet grouting pile completes one pile, continuously moving the multifunctional full-hydraulic drilling machine to the next pile position, and repeating the steps 6-10 to construct the next pile.
3. The construction method of the double-hydraulic-quick-setting high-pressure jet grouting pile according to claim 1, characterized in that: in step 3, the head of the multifunctional full-hydraulic drill rod machine is set to rotate at 360 degrees without dead angles so as to facilitate construction at narrow positions during emergency rescue, and when a high-speed power head is selected for the multifunctional full-hydraulic drill rod machine, the rotating speed of the power head comprises: the low speed is 8-275r/min, the high speed is 16-550r/min, the torque of a power head of the multifunctional full-hydraulic drill rod machine is 6000N.m-3000N.m, the travel of the power head is 3000mm, and the power of the multifunctional full-hydraulic drill rod machine is larger, so that the problems of drill holding, drill burying and the like caused by rapid hardening in operation can be prevented.
4. The construction method of the double-hydraulic-quick-setting high-pressure jet grouting pile according to claim 1, characterized in that: and 9, the specification of the drill rod is phi 60-phi 89 multiplied by 2500mm so as to prevent the drill rod from being broken due to overlarge torque during liquid spraying, a high-strength sealing gasket is arranged on the drill rod, and when the drill rod needs to be disassembled after the previous section of drill rod is sprayed, the residual double liquid in the drill rod needs to be washed out of the nozzle by using clear water.
5. The construction method of the double-hydraulic-quick-setting high-pressure jet grouting pile according to claim 1, characterized in that: in the step 6, the preset water-cement ratio is 1:1, P.O42.5 ordinary portland cement is adopted as the cement, the cement is stirred by the stirrer for 2-5 minutes, and cement paste obtained after stirring and filtering by the stirrer is poured into a paste barrel.
6. The construction method of the double-hydraulic-quick-setting high-pressure jet grouting pile according to claim 1, characterized in that: and 8, adopting a double-pipe method for the double-liquid rapid-hardening high-pressure jet grouting pile, wherein a pump body of the double-liquid rapid-hardening high-pressure jet grouting pile is a variable-frequency high-pressure pump, drilling a grouting pipe with two nozzles to a preset depth position of a drilled hole by using a multifunctional full-hydraulic drill pipe machine, respectively conveying cement slurry obtained by stirring in the step 6 and water glass obtained by modulation in the step 7 into the grouting pipe through the variable-frequency high-pressure pump when the grouting pipe reaches the preset depth, respectively and rotatably spraying the cement slurry and the water glass through two nozzles at the bottom of the multifunctional full-hydraulic drill pipe machine, and driving the nozzles to rotate and lift from bottom to top to perform jet operation by using the multifunctional full-hydraulic drill pipe machine.
7. The construction method of the double-hydraulic-quick-setting high-pressure jet grouting pile as claimed in claim 6, wherein: and 8, adopting a three-cylinder separated pump body as a pump body of the double-liquid quick-setting high-pressure jet grouting pile in the step 8, wherein cement slurry is discharged from two cylinders, water glass is discharged from one cylinder, cement slurry and water glass are respectively sprayed out of the pump body through two nozzles of a grouting pipe below the multifunctional full-hydraulic drilling rod machine, the cement slurry and the water glass solution sprayed out of the two nozzles are stirred and mixed at the bottom of a pile position through a drilling rod of the multifunctional full-hydraulic drilling rod machine in a rotating mode and are lifted upwards at a certain speed to form the cement slurry quick-setting pile, and the time required by the cement slurry and the water glass quick-setting pile is less than 2 minutes.
8. The construction method of the double-hydraulic-quick-setting high-pressure jet grouting pile as claimed in claim 6, wherein: the double-liquid rapid hardening high-pressure jet grouting pile adopts a double-nozzle special drill bit which is respectively arranged at the bottom of the multifunctional full-hydraulic drill rod machine so as to avoid drill blockage.
9. The construction method of the double-hydraulic-quick-setting high-pressure jet grouting pile according to claim 8, characterized in that: the rotating speed of the dual-nozzle special drill bit for spraying cement paste and water glass is 5-25cm/min, and the lifting speed of the multifunctional full-hydraulic drill rod machine for driving the nozzles to lift upwards is 10-25 cm/min.
10. The construction method of the double-hydraulic-quick-setting high-pressure jet grouting pile as claimed in claim 6, wherein: two pressure gauges are installed above the variable-frequency high-pressure pump, the pressure of the pressure gauges can reach 30MPa, safety valves are further installed on two sides of the variable-frequency high-pressure pump, and when the pressure in the variable-frequency high-pressure pump exceeds 45MPa, the safety valves can be automatically opened to release pressure.
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| CN113818429A (en) * | 2021-11-09 | 2021-12-21 | 樊军让 | Construction device for changing soil outside pile and construction method thereof |
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