CN212671560U - High-pressure jet grouting pile hole guiding construction integrated device - Google Patents
High-pressure jet grouting pile hole guiding construction integrated device Download PDFInfo
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- CN212671560U CN212671560U CN202020998745.2U CN202020998745U CN212671560U CN 212671560 U CN212671560 U CN 212671560U CN 202020998745 U CN202020998745 U CN 202020998745U CN 212671560 U CN212671560 U CN 212671560U
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Abstract
The utility model relates to a high-pressure jet grouting pile hole guiding construction integrated device, which comprises a jet grouting drilling machine, a high-pressure jet drilling rod and a triple pipe; the triple pipe is fixedly arranged at the bottom of the high-pressure injection drill rod, and the bottom of the triple pipe is fixedly provided with a down-the-hole hammer; the triple pipe comprises a slurry outlet ejector, an inner gas outlet ejector and an outer gas outlet ejector which are sequentially arranged from inside to outside; the utility model discloses simple structure, convenient and practical to the environment of complicated geological formation, adopts the construction technology that triple pipe and down-the-hole hammer combined together to through optimizing construction technical parameter, the pile body intensity that obtains is high, and construction quality is good. Compared with the traditional construction method of the high-pressure jet grouting pile, the method has the advantages of less input mechanical materials, low cost, safe construction and quick construction.
Description
Technical Field
The utility model belongs to the technical field of the construction, especially, relate to a high pressure jet grouting pile draws hole construction integrated device.
Background
Along with the development of urban underground space, the requirement on the effect of the waterproof curtain is higher and higher during the construction of the deep foundation pit. The jet grouting pile is characterized in that a jet grouting pipe and a nozzle drill are arranged at a designed elevation at the bottom of the pile by using a drilling machine, prepared grout in advance is sprayed out from a nozzle at the edge of the grouting pipe at a high speed after obtaining huge energy through a high-pressure generating device to form a stream with highly concentrated energy, a soil body is directly damaged, in the spraying process, a drill rod is lifted while rotating, so that the grout and the soil body are fully stirred and mixed, and a columnar solidification body with a certain diameter is formed in the soil, so that the foundation is reinforced. The construction process generally comprises two working flows, namely drilling and spraying, cutting the soil body by high-pressure air and high-pressure water spraying, and then lifting and stirring the high-pressure cement slurry to ensure the proportion and the quality of the soil for each meter of pile.
In the past, the high-pressure rotary jet grouting piles are inserted among reinforced concrete retaining piles in a large quantity in the deep foundation pit waterproof curtain of the building engineering, and a single-pipe or double-pipe construction process is mostly adopted, when a hard soil layer is encountered, a geological drilling machine is often required to firstly guide holes, and then high-pressure rotary jet grouting is carried out, so that the construction period is long, and the manufacturing cost is high.
Three-pipe rotary spraying: the method only sprays cement slurry, air and high-pressure water, and has the mechanism that the high-pressure water and the high-pressure air are used for cutting the soil body, then the cement slurry is used for filling the cut soil body, the pile diameter is generally 1.0-1.2 m, the construction can be carried out in a round gravel layer, the cement consumption is generally 400kg/m, and the normal construction speed is generally 10-20 cm/min. The water outlet air outlet ejector in the common triple pipe can eject high-pressure air while discharging water, the slurry outlet air outlet ejector can eject high-pressure air while discharging slurry, and the water outlet air outlet ejector needs to be welded on a drill rod, so that a down-hole impact type ejector combined device cannot be quickly replaced during construction of a hard stratum, and great inconvenience can be caused in the construction process.
Chinese utility model publication No. CN1944809A, published 11/4/2007, discloses a triple-pipe double-high-pressure rotary jet grouting reinforcement construction method and apparatus, wherein high-pressure water flow wrapping compressed air and high-pressure cement flow wrapping compressed air are respectively sprayed out through nozzles at upper and lower parts of an injector, the high-pressure water jet flow at upper part firstly cuts and crushes the soil body once, the high-pressure cement jet flow at lower part secondly enlarges, cuts and crushes the soil body secondarily, and then cement paste and the soil body are mixed to form a foundation reinforcement pile body. However, the patent only has strong breaking effect on soil body, and when meeting complex hard strata such as pebble bed or rock stratum, rock can not be broken by cutting by liquid high-pressure injection, so that an effective composite cement soil body can not be formed, and if the composite cement soil body is used for a waterproof curtain, the hidden danger of leakage is caused. The traditional triple-pipe high-pressure rotary jet grouting pile construction adopts a geological drilling machine to guide holes, and then a jet grouting pipe is inserted into the shotcrete construction with a preset depth, so that the construction progress is influenced, the construction problems of hole collapse, drill burying and the like are easily caused, and the defects are more prominent when the pile is constructed in complex hard strata such as a sand layer, a pebble layer, a rock stratum and the like.
Chinese utility model publication No. CN102322058A, published in 2012, 01/18, discloses a construction process and equipment for a down-the-hole impact high-pressure jet grouting pile, wherein under the high-frequency vibration of a down-the-hole impactor, high-pressure water, high-pressure air and high-frequency vibration generate a linkage mechanism to rapidly soften the surrounding soil, and after the high-pressure pump is converted into high-pressure cement paste, a uniform cement soil pile is formed. However, the patent adopts a double pipe and a down-the-hole hammer, high-pressure water and high-pressure cement slurry are not separately sprayed, the high-pressure water and the high-pressure cement slurry share the same nozzle, and only the slurry can be sprayed and water can not be sprayed when the high-pressure water and the high-pressure cement slurry are lifted after drilling and forming holes, so that the secondary cutting effect on soil bodies is weakened, the pile forming diameter is smaller, and the pile forming effect is poorer.
In view of the above problems, it is necessary to improve them.
SUMMERY OF THE UTILITY MODEL
The utility model relates to an overcome the defect among the above-mentioned prior art, provide a simple easy-to-use, the efficiency is high, and strong adaptability has improved the high pressure jet grouting stake pilot hole construction integrated device of pore-forming quality.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a high-pressure jet grouting pile hole guiding construction integrated device comprises a jet grouting drilling machine, a high-pressure jet drilling rod and a triple pipe; the triple pipe is fixedly arranged at the bottom of the high-pressure injection drill rod, and the bottom of the triple pipe is fixedly provided with a down-the-hole hammer; the triple pipe comprises a slurry outlet ejector, an inner gas outlet ejector and an outer gas outlet ejector which are sequentially arranged from inside to outside.
As an optimal scheme of the utility model, the down-the-hole hammer is connected with the unit head through high-pressure injection drilling rod in order to transmit power.
As a preferred scheme of the utility model, the slurry outlet ejector is provided with a slurry outlet hole, and correspondingly, the inner gas outlet ejector is provided with an inner gas outlet hole; the outer air outlet ejector is provided with an outer air outlet; the slurry outlet hole and the inner air outlet hole are on the same horizontal plane, and the outer air outlet hole is positioned below the slurry outlet hole and the inner air outlet hole.
As a preferred scheme of the utility model, the mortar stirring device also comprises a mortar stirring barrel, wherein the mortar stirring barrel is connected with a high-pressure grouting pump through a mortar storage barrel, and the high-pressure grouting pump is connected into a triple pipe through a high-pressure mortar pipeline; the high-pressure slurry pipeline is communicated with a slurry outlet hole on the slurry outlet ejector.
As a preferred scheme of the utility model, the utility model also comprises an air compressor; the air compressor is connected with an air main pipe, the air main pipe is respectively communicated with an inner high-pressure air pipe and an outer high-pressure air pipe, and the inner high-pressure air pipe and the outer high-pressure air pipe are respectively connected into the triple pipes; the inner high-pressure air pipe is communicated with the inner air outlet hole on the inner air outlet ejector, and the outer high-pressure air pipe is communicated with the outer air outlet hole on the outer air outlet ejector.
As an optimized proposal of the utility model, the inner high-pressure air pipe and the outer high-pressure air pipe are respectively provided with an inner connecting valve and an outer connecting valve.
As a preferred scheme of the utility model, the compressed air provided by the air compressor enters the down-the-hole hammer through the air outlet hole to make the down-the-hole hammer work, and the down-the-hole hammer comprises an impactor, a central drill bit and an eccentric drill bit; the central drill bit is fixedly arranged at the bottom of the eccentric drill bit; the eccentric drill bit is fixedly provided with a central pipe, the central pipe is fixedly provided with a guide pipe, the eccentric drill bit is positioned between the central pipe and the central drill bit, the piston of the impactor impacts the central pipe and the guide pipe, and the guide pipe transmits impact waves to the eccentric drill bit and the central drill bit to crush rocks at the bottom of the hole.
As a preferred scheme of the utility model, the down-the-hole hammer further comprises a casing shoe and a casing; the central tube and the guide tube are arranged in the casing shoe, and the top end of the casing shoe is connected with the casing.
As an optimized scheme of the utility model, three lug has set firmly on the casing boot inner wall, and three lug equidistance is laid.
As an optimized scheme of the utility model, it is protruding that a plurality of alloys have been laid on the terminal surface of center drill bit, and this protruding equidistance of alloy sets firmly in center drill bit bottom.
A construction method of a high-pressure jet grouting pile hole guiding construction integrated device comprises the following steps:
step one, measuring and positioning pay-off: measuring and releasing a construction axis according to a designed construction drawing;
step two, guiding the drill to rotate and spray the drilling machine to put in place: arranging the rotary jet drilling machine on a designed pile position, and aligning a drill bit of the rotary jet drilling machine to the center of the pile position; meanwhile, the rotary jetting drill machine is horizontally adjusted, so that the axis of a drill rod of the rotary jetting drill machine is vertically aligned with the center position of a drill hole;
thirdly, testing the high-pressure jet grouting pile before construction, and determining set parameters of the high-pressure jet grouting pile according to a pile testing result;
step four, after setting parameters on the basis of the step three, firstly starting the air compressor in a no-load mode, after the operation is normal, supplying air into the inner air outlet hole and the outer air outlet hole through the inner high-pressure air pipe and the outer high-pressure air pipe to enable the air quantity to rise to a set value, after the air is smooth, starting jet grouting to drill a leading hole downwards, controlling the construction depth of the hole forming of the high-pressure jet grouting pile, and ensuring that the drilling depth reaches the set depth of the construction;
fifthly, before the drilling depth reaches the set depth of construction, cement paste is prepared for standby; after a rotary jet drilling machine of the high-pressure rotary jet pile drills to a set depth, starting a high-pressure grouting pump, starting grouting after the pump amount and the pump pressure are normal, lifting the ejector combination device after the configured cement slurry flows out of the nozzle, and spraying grouting from bottom to top; when the deep layer is sprayed in a rotary mode, the slurry is sprayed firstly, and then the rotating and lifting are carried out;
and step six, after the guniting pile is formed, pulling out the high-pressure injection drill rod, cleaning the high-pressure grouting pump, the high-pressure injection drill rod and the high-pressure slurry pipeline, and then shifting the high-pressure rotary guniting pile to perform construction of the next pile.
The utility model has the advantages that:
1. the utility model discloses simple structure, convenient and practical to the environment of complicated geological formation, adopts the construction technology that triple pipe and down-the-hole hammer combined together to through optimizing construction technical parameter, the pile body intensity that obtains is high, and construction quality is good. Compared with the traditional construction method of the high-pressure jet grouting pile, the method has the advantages of less input mechanical materials, low cost, safe construction and quick construction.
2. The down-the-hole hammer with the casing drill efficiently drills into holes under various complex geological conditions such as various soft and hard stratums, gravel layers, pebble layers, boulder rock layers and the like, and simultaneously achieves the effects of good aperture and hole wall quality, high vertical precision and rapid construction due to the rotation follow-up of the casing drill; the problems of noise, vibration, slurry pollution and the like of the traditional rock drilling machine are solved;
3. the bottom of the triple pipe is provided with the down-the-hole hammer, and the air with certain pressure provided by the air compressor drives the piston in the down-the-hole hammer cylinder body to do axial reciprocating motion, so that the tool bit at the end part of the down-the-hole hammer body generates impact efficiency while rotating, thereby applying pure damage to rock and soil and achieving the rock entering function;
4. the utility model has the advantages that the drift diameter of the internal gas, the external gas and the slurry channel of the high-pressure jet triple-pipe rotary joint is large enough, so that the fluids such as the internal gas, the external gas and the slurry can not meet the bottleneck resistance when passing through the high-pressure jet triple-pipe rotary joint, thereby ensuring the flow of the internal gas, the external gas and the slurry required by the construction specification;
5. the utility model discloses a mutual cooperation between central drill bit and the eccentric drill bit, drill out the hole that is greater than the sleeve pipe external diameter when drilling to predetermined stratum, can be with the pipe-following drilling tool convergence, make the biggest external diameter of pipe-following drilling tool be less than the pipe shoe, the sheathed tube internal diameter to take out the pipe-following drilling tool, the sleeve pipe is then stayed the protection pore wall in the stratum, and is efficient, is worth wideling popularize;
6. the utility model has simple and small structure, convenient use, simple disassembly, reduced labor intensity, improved construction efficiency and uneasy damage; the construction time is saved; the cost is low, the high-pressure grouting pressure of the triple pipe is high, the soil cutting capacity is high, the water stopping effect of the formed cement soil consolidation body is good, and the method can be applied to the field of foundation soil reinforcement.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a partial enlarged view of embodiment A of the present invention;
FIG. 3 is a cross-sectional view of the down-the-hole hammer according to an embodiment of the present invention;
description of the drawings: the device comprises a rotary jet drilling machine 1, a high-pressure jet drill rod 2, a triple pipe 3, a down-the-hole hammer 4, a slurry outlet ejector 5, an inner gas outlet ejector 6, an outer gas outlet ejector 7, a power head 8, an alloy bulge 9, a central drill bit 11, an eccentric drill bit 12, a central pipe 13, a casing shoe 14, a casing pipe 15, a guide pipe 16, a bump 17, an impactor 18, a slurry outlet 50, a slurry stirring barrel 54, a slurry storage barrel 55, a high-pressure slurry injection pump 56, a high-pressure slurry pipeline 57, an inner gas outlet 60, an air compressor 61, an air main pipe 62, an inner high-pressure air pipe 63, an outer high-pressure air pipe 64, an inner connecting valve 65, an outer connecting valve 66 and an.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
as shown in fig. 1-3, an integrated device for hole guiding construction of a high-pressure jet grouting pile comprises a jet grouting drilling machine 1, a high-pressure jet drilling rod 2 and a triple pipe 3; the triple pipe 3 is fixedly arranged at the bottom of the high-pressure injection drill rod 2, and the bottom of the triple pipe 3 is fixedly provided with a down-the-hole hammer 4; the triple pipe 3 comprises a slurry outlet ejector 5, an inner gas outlet ejector 6 and an outer gas outlet ejector 7 which are sequentially arranged from inside to outside; the down-the-hole hammer with the casing drill efficiently drills into holes under various complex geological conditions such as various soft and hard stratums, gravel layers, pebble layers, boulder rock layers and the like, and simultaneously achieves the effects of good aperture and hole wall quality, high vertical precision and rapid construction due to the rotation follow-up of the casing drill; the problems of noise, vibration, mud pollution and the like of the traditional rock drilling machine are solved.
The utility model discloses a high internal gas that spouts the triplex pipe rotary joint, outer gas, the latus rectum of thick liquid passageway all has enough big, can guarantee like this that fluid such as internal gas, outer gas, thick liquid can not meet the bottleneck resistance when spouting the triplex pipe rotary joint through the height to ensure internal gas, outer gas, the thick liquid flow that the construction specification required.
A cylindrical air flow surrounds the periphery of a high-pressure water flow generated by a high-pressure generating device such as a high-pressure pump and the like in the traditional triple pipe 3, a high-pressure water flow jet flow and the air flow coaxially jet and punch a soil body to form a large void, cement paste is injected into a ground to be cut and crushed by a slurry pump at a low pressure, and a nozzle rotates and lifts to mix the cement paste with soil and solidify the cement paste in the soil to form a large solidified body. The pile foundation is mostly adopted in high-rise and super high-rise building foundations in modern building engineering, for limestone areas, due to the fact that engineering geological conditions are poor, a large number of unfavorable geological phenomena such as soil caves, soft soil layers, karst caves, joints, cracks and the like exist, the design and construction of the pile foundation are often greatly influenced, the high-pressure rotary spraying composite foundation treatment technology is adopted, the technical problems that pile digging, filling and drilling (punching) piles are difficult to form in the karst areas and the construction period cannot be guaranteed are solved, the foundation treatment effect is obvious, the influence of various unfavorable geological phenomena in the limestone areas is overcome, and the safety of foundation engineering is improved.
And the utility model discloses simple structure, convenient and practical to the environment of complicated geological formation, adopts the construction technology that triple pipe and down-the-hole hammer combined together to through optimizing construction technical parameter, the pile body intensity that obtains is high, and construction quality is good. Compared with the traditional construction method of the high-pressure jet grouting pile, the method has the advantages of less input mechanical materials, low cost, safe construction and quick construction.
The down-the-hole hammer 4 is connected with a power head 8 through a high-pressure injection drill rod 2 to transmit power; the slurry outlet ejector 5 is provided with a slurry outlet hole 50, and correspondingly, the inner gas outlet ejector 6 is provided with an inner gas outlet hole 60; an outer air outlet hole 70 is distributed on the outer air outlet ejector 7; the slurry outlet hole 50 and the inner air outlet hole 60 are on the same horizontal plane, and the outer air outlet hole 70 is positioned below the slurry outlet hole 50 and the inner air outlet hole 60.
The high-pressure jet grouting pile hole guiding construction integrated device further comprises a slurry stirring barrel 54, wherein the slurry stirring barrel 54 is connected with a high-pressure slurry injection pump 56 through a slurry storage barrel 55, and the high-pressure slurry injection pump 56 is connected into the triple pipe 3 through a high-pressure slurry pipeline 57; the high-pressure slurry pipeline 57 is communicated with the slurry outlet 50 on the slurry outlet ejector 5.
The high-pressure jet grouting pile hole guiding construction integrated device also comprises an air compressor 61; the air compressor 61 is connected with an air main pipe 62, the air main pipe 62 is respectively communicated with an inner high-pressure air pipe 63 and an outer high-pressure air pipe 64, and the inner high-pressure air pipe 63 and the outer high-pressure air pipe 64 are respectively connected into the triple pipe 3; the inner high-pressure air pipe 63 is communicated with the inner air outlet 60 on the inner air outlet ejector 6, and the outer high-pressure air pipe 64 is communicated with the outer air outlet 70 on the outer air outlet ejector 7.
The inner high-pressure air pipe 63 and the outer high-pressure air pipe 64 are respectively provided with an inner connecting valve 65 and an outer connecting valve 66; compressed air provided by the air compressor 61 enters the down-the-hole hammer 4 through the air outlet 70 to work, and the down-the-hole hammer 4 comprises an impactor 18, a central drill bit 11 and an eccentric drill bit 12; the central drill bit 11 is fixedly arranged at the bottom of the eccentric drill bit 12; a central pipe 13 is fixedly arranged on the eccentric drill bit 12, a guide pipe 16 is fixedly arranged on the central pipe 13, the eccentric drill bit 12 is positioned between the central pipe 13 and the central drill bit 11, a piston of the impactor 18 impacts the central pipe 13 and the guide pipe 16, and the guide pipe 16 transmits impact waves to the eccentric drill bit 12 and the central drill bit 11 to crush rocks at the bottom of a hole.
The utility model discloses a mutually supporting between central drill bit and the eccentric drill bit drills out the hole that is greater than the sleeve pipe external diameter during the drilling to when creep into to predetermined stratum, can be with the heel pipe drilling tool convergence, make the biggest external diameter of heel pipe drilling tool be less than pipe boot, sheathed tube internal diameter, thereby take out the heel pipe drilling tool, the sleeve pipe then remains the protection pore wall in the stratum, and is efficient, is worth wideling popularize.
Specifically, the rotary jet drilling machine 1 provides rotary torque and propulsion power during working; during normal drilling, compressed air provided by an air compressor 61 enters the down-the-hole impacter 18 through the rotary jet drilling machine 1 and the high-pressure jet drill rod 2 to enable the down-the-hole impacter to work, a piston of the impacter 18 impacts the central pipe 13 and the guide pipe 16, and the guide pipe 16 transmits impact waves to the eccentric drill bit 12 and the central drill bit 11 to break rock at the bottom of the hole. Meanwhile, the rotary jet drilling machine 1 drives the high-pressure jet drilling rod 2 to rotate, the high-pressure jet drilling rod 2 transmits rotation torque to the impacter 18, the impacter 18 drives the central tube 13 to rotate through a spline, the eccentric drill bit 12 is opened when the eccentric shaft central tube 13 on the central tube 13 rotates, and is limited after being opened to a designed position, so that the central drill bit 11 and the eccentric drill bit 12 rotate along with the central tube 13 at the same time; the down-the-hole hammer 4 further comprises a casing shoe 14 and a casing 15; the central tube 13 and the guide tube 16 are arranged in the casing shoe 14, and the top end of the casing shoe 14 is connected with the casing 15; three convex blocks 17 are fixedly arranged on the inner wall of the casing shoe 14, and the three convex blocks 17 are arranged at equal intervals; the hole hammer controls the center by three bumps 17 welded on the inner walls of the casing bit and the diving pipe shoe; when the eccentric bit 12 extends out of the casing shoe 14, the lug 17 is in the position of controlling the diving hole hammer, so that eccentric reaming drilling is realized, the casing is simultaneously followed, when the drilling tool is drilled and pulled upwards, the lug is positioned at the position of controlling the bit body, a lug is embedded into the groove of the bit pattern, and the eccentric bit can enter the casing and be pulled out of the ground surface.
The eccentric drill bit 12 drills a hole diameter larger than the largest outer diameter of the adapter sleeve 15 so that the adapter sleeve 15 follows without being obstructed by the rock at the bottom of the hole. When the gravity of the connecting sleeve 15 is greater than the frictional resistance of the stratum to the outer wall of the connecting sleeve 15, the connecting sleeve 15 follows by self weight; when the frictional resistance of the outer wall of the joint casing 15 exceeds the weight of the joint casing 15, the inner casing drill continues to crush the rock forward.
The surface of the central tube 13 is provided with air holes for blowing the rock debris and also provided with air grooves for discharging the rock debris at the bottoms of the holes. Most of the compressed air reaches the bottom of the hole through the central hole of the central pipe 13, the eccentric bit 12 and the central bit 11 after being worked by the impactor 18, washes broken or loosened rock at the bottom of the hole, cools the bit, carries rock powder to enter the annular space of the connecting sleeve 15, the impactor 18 and the high-pressure jet drill pipe 2 through the central bit 11 and the powder discharge groove of the central pipe 13 and is discharged out by high-speed upward returned airflow or foam.
A plurality of alloy bulges 9 are distributed on the end surface of the central drill bit 11, and the alloy bulges 9 are fixedly arranged at the bottom of the central drill bit 11 at equal intervals; to increase the drilling force during drilling.
A construction method of a high-pressure jet grouting pile hole guiding construction integrated device comprises the following steps:
step one, measuring and positioning pay-off: measuring and releasing a construction axis according to a designed construction drawing; clearing up obstacles on a construction site, leveling the construction site, setting the flatness of the construction site to be +100mm or-100 mm, clearing underground obstacles as much as possible so as to avoid influencing the construction efficiency, setting the leveling elevation of the construction site to be higher than the elevation of the pile head of a triple-pipe high-pressure jet grouting pile by at least 1000mm, setting the width of a working surface of the construction site to be not less than 2m, compiling a construction scheme according to a construction general plan and a design drawing, determining a construction process, and arranging piling construction flow water.
And the integrity of high-pressure equipment and pipelines in the triple-pipe high-pressure jet grouting pile is checked, the pressure and the flow of the pile must meet the design requirements, no sundries are left in the high-pressure grouting pipe and the nozzle, and the grouting joint is sealed perfectly.
A professional measurer undertakes measurement and positioning work, measurement and setting-out are carried out according to the actual position of the constructed fender pile, the pile position of the triple-pipe high-pressure jet grouting pile is determined, the pile position is marked by steel bars, the pile position needs to be re-measured during construction and positioning, and the error of the pile position is not more than 50 mm; after the pile position of the triple-pipe high-pressure jet grouting pile is determined, a slurry discharge ditch is arranged, slurry discharge is facilitated, 10-20% of slurry return amount can be generated in the construction process of the jet grouting pile, waste slurry is introduced into a sedimentation tank, clear water after sedimentation can be discharged in a pollution-free mode according to site conditions, sedimentary soil is conveyed away together when a foundation pit is excavated, and sedimentation and pollution discharge are uniformly brought into a whole-site sewage treatment system.
Step two, positioning the drill guiding rotary spraying drilling machine 1: arranging the rotary jet drilling machine 1 on a designed pile position, and aligning a drill bit of the rotary jet drilling machine 1 to the center of the pile position; and meanwhile, the rotary spraying drilling machine 1 is horizontally adjusted, so that the axis of a drill rod of the rotary spraying drilling machine 1 is vertically aligned with the center position of a drill hole.
A drilling machine of the triple-pipe high-pressure jet grouting pile is put in place, the machine base of the drilling machine is smooth and stable, the vertical shaft is aligned with the hole position, and the hole forming quality and the hole forming depth are ensured; after the drilling machine is in place, leveling and centering the pile machine (leveling the pile machine by adopting a method of combining a horizontal guiding rule with a hammer ball of a drilling machine frame and aligning the pile position), adjusting the perpendicularity of the pile machine, wherein the perpendicularity error of the pile machine is less than 1.5 percent, so that a drill rod is consistent with the pile position; before drilling, an air compressor and a high-altitude grouting pump are debugged to enable the equipment to operate normally, the length of a drill rod is checked, a depth line is marked beside a drilling tower by using red paint, and the bottom elevation of a hole is guaranteed to meet the design depth.
Thirdly, testing the high-pressure jet grouting pile before construction, and determining set parameters of the high-pressure jet grouting pile according to a pile testing result; before formal construction of the jet grouting pile, a typical stratum is selected, a jet grouting pile process and a pile forming effect test are carried out, a pile body is excavated 3 days after pile forming, the pile forming effect and the diameter are checked, and if the pile forming effect and the diameter do not meet the design requirements, the construction process needs to be improved; and testing the triple-tube high-pressure jet grouting pile before construction, and determining the set parameters of the triple-tube high-pressure jet grouting pile according to the pile testing result.
Setting parameters including air pressure of 0.5-0.7 MPa and air flow of 12L/min; the cement paste pressure is 1.5-2.5 MPa, and the cement paste flow is 100L/min; the drilling machine of the triple-tube high-pressure jet grouting pile is lifted at a speed of 16-20 cm/min, and the rotation speed is 20 r/min; the cement in the cement paste is P.O42.5-grade portland cement, the cement doping amount is 30%, the water cement ratio is 1.0, and the 28-day unconfined compressive strength is not less than 1.0MPa (wherein, inorganic binder samples are prepared according to the test mixing ratio, the amount of the inorganic binder required in a test mold is calculated, the inorganic binder is put into the test mold, a strength instrument is used for pressing the inorganic binder into the test mold, the maintenance is carried out after the mold is removed, the pressure test is carried out in the strength instrument after 28 days, and the obtained strength is the 28-day unconfined compressive strength).
And step four, after setting parameters on the basis of the step three, firstly starting the air compressor 61 in a no-load mode, after the operation is normal, supplying air into the inner air outlet 60 and the outer air outlet 70 through the inner high-pressure air pipe 63 and the outer high-pressure air pipe 64 to enable the air quantity to rise to a set value, after the air is smooth, starting rotary spraying to drill downwards into the guide hole, controlling the construction depth of the high-pressure rotary spraying pile hole forming, and ensuring that the drilling depth reaches the set construction depth.
Fifthly, before the drilling depth reaches the set depth of construction, cement paste is prepared for standby; after a rotary jet drilling machine of the high-pressure rotary jet pile drills to a set depth, starting a high-pressure grouting pump, starting grouting after the pump amount and the pump pressure are normal, lifting the ejector combination device after the configured cement slurry flows out of the nozzle, and spraying grouting from bottom to top; when the deep layer is sprayed in a rotary mode, the slurry is sprayed firstly, and then the rotating and lifting are carried out.
And step six, after the guniting pile is formed, pulling out the high-pressure injection drill rod 2, cleaning the high-pressure grouting pump, the high-pressure injection drill rod 2 and the high-pressure grout pipeline, and then shifting the high-pressure jet grouting pile to perform construction of the next pile.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the reference numerals in the figures are used more here: the term "jet grouting equipment" refers to a rotary jet drilling machine 1, a high-pressure jet drill pipe 2, a triple pipe 3, a down-the-hole hammer 4, a slurry outlet ejector 5, an inner gas outlet ejector 6, an outer gas outlet ejector 7, a power head 8, an alloy protrusion 9, a center drill 11, an eccentric drill 12, a center pipe 13, a casing shoe 14, a casing 15, a guide pipe 16, a bump 17, an impactor 18, a slurry outlet 50, a slurry stirring barrel 54, a slurry storage barrel 55, a high-pressure slurry injection pump 56, a high-pressure slurry pipeline 57, an inner gas outlet 60, an air compressor 61, an air main pipe 62, an inner high-pressure air pipe 63, an outer high-pressure air pipe 64, an inner connecting valve 65, an outer connecting valve 66, an outer gas outlet 70, and the like. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
Claims (10)
1. The utility model provides a high pressure jet grouting pile guide hole construction integrated device which characterized in that: comprises a rotary jet drilling machine (1), a high-pressure jet drill rod (2) and a triple pipe (3); the triple pipe (3) is fixedly arranged at the bottom of the high-pressure injection drill rod (2), and the bottom of the triple pipe (3) is fixedly provided with a down-the-hole hammer (4); the triple pipe (3) comprises a slurry outlet ejector (5), an inner gas outlet ejector (6) and an outer gas outlet ejector (7) which are sequentially arranged from inside to outside.
2. The high-pressure jet grouting pile hole guiding construction integrated device according to claim 1, characterized in that: the down-the-hole hammer (4) is connected with the power head (8) through the high-pressure injection drill rod (2) to transmit power.
3. The high-pressure jet grouting pile hole guiding construction integrated device according to claim 1, characterized in that: the pulp outlet ejector (5) is provided with pulp outlet holes (50), and correspondingly, the inner air outlet ejector (6) is provided with inner air outlet holes (60); an outer air outlet hole (70) is distributed on the outer air outlet ejector (7); the slurry outlet hole (50) and the inner air outlet hole (60) are on the same horizontal plane, and the outer air outlet hole (70) is positioned below the slurry outlet hole (50) and the inner air outlet hole (60).
4. The high-pressure jet grouting pile hole guiding construction integrated device according to claim 1, characterized in that: the mortar mixing device also comprises a stirring barrel (54), wherein the stirring barrel (54) is connected with a high-pressure grouting pump (56) through a mortar storage barrel (55), and the high-pressure grouting pump (56) is connected into the triple pipe (3) through a high-pressure mortar pipeline (57); the high-pressure slurry pipeline (57) is communicated with a slurry outlet hole (50) on the slurry outlet ejector (5).
5. The high-pressure jet grouting pile hole guiding construction integrated device according to claim 1, characterized in that: also comprises an air compressor (61); the air compressor (61) is connected with an air main pipe (62), the air main pipe (62) is respectively communicated with an inner high-pressure air pipe (63) and an outer high-pressure air pipe (64), and the inner high-pressure air pipe (63) and the outer high-pressure air pipe (64) are respectively connected into the triple pipes (3); the inner high-pressure air pipe (63) is communicated with an inner air outlet hole (60) on the inner air outlet ejector (6), and the outer high-pressure air pipe (64) is communicated with an outer air outlet hole (70) on the outer air outlet ejector (7).
6. The high-pressure jet grouting pile hole guiding construction integrated device as claimed in claim 5, wherein: the inner high-pressure air pipe (63) and the outer high-pressure air pipe (64) are respectively provided with an inner connecting valve (65) and an outer connecting valve (66).
7. The high-pressure jet grouting pile hole guiding construction integrated device as claimed in claim 5, wherein: compressed air provided by the air compressor (61) enters the down-the-hole hammer (4) through an air outlet (70) to enable the down-the-hole hammer to work, and the down-the-hole hammer (4) comprises an impactor (18), a central drill bit (11) and an eccentric drill bit (12); the central drill bit (11) is fixedly arranged at the bottom of the eccentric drill bit (12); a central pipe (13) is fixedly arranged on the eccentric drill bit (12), a guide pipe (16) is fixedly arranged on the central pipe (13), the eccentric drill bit (12) is positioned between the central pipe (13) and the central drill bit (11), a piston of the impactor (18) impacts the central pipe (13) and the guide pipe (16), and the guide pipe (16) transmits impact waves to the eccentric drill bit (12) and the central drill bit (11) to break rock at the bottom of a hole.
8. The high-pressure jet grouting pile hole guiding construction integrated device according to claim 7, characterized in that: the down-the-hole hammer (4) further comprises a casing shoe (14) and a casing (15); the central pipe (13) and the guide pipe (16) are arranged in the casing shoe (14), and the top end of the casing shoe (14) is connected with the casing (15).
9. The high-pressure jet grouting pile hole guiding construction integrated device according to claim 8, characterized in that: three convex blocks (17) are fixedly arranged on the inner wall of the casing shoe (14), and the three convex blocks (17) are arranged at equal intervals.
10. The high-pressure jet grouting pile hole guiding construction integrated device according to claim 7, characterized in that: the end face of the central drill bit (11) is provided with a plurality of alloy bulges (9), and the alloy bulges (9) are fixedly arranged at the bottom of the central drill bit (11) at equal intervals.
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| CN202020998745.2U CN212671560U (en) | 2020-06-03 | 2020-06-03 | High-pressure jet grouting pile hole guiding construction integrated device |
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| CN202020998745.2U CN212671560U (en) | 2020-06-03 | 2020-06-03 | High-pressure jet grouting pile hole guiding construction integrated device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111577136A (en) * | 2020-06-03 | 2020-08-25 | 浙江岩科建设有限公司 | High-pressure jet grouting pile hole guiding construction integrated device and construction method thereof |
| CN113818801A (en) * | 2021-08-20 | 2021-12-21 | 北京建材地质工程有限公司 | Construction method and construction system for eliminating sand layer liquefaction |
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2020
- 2020-06-03 CN CN202020998745.2U patent/CN212671560U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111577136A (en) * | 2020-06-03 | 2020-08-25 | 浙江岩科建设有限公司 | High-pressure jet grouting pile hole guiding construction integrated device and construction method thereof |
| CN113818801A (en) * | 2021-08-20 | 2021-12-21 | 北京建材地质工程有限公司 | Construction method and construction system for eliminating sand layer liquefaction |
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