CN110984142A - Waste slurry recycling and circulating system for rotary spraying pile or stirring spraying pile - Google Patents

Abstract

The invention discloses a waste slurry recycling and circulating system for a jet grouting pile or a jet stirring pile, which adopts the technical scheme that: and collecting the waste cement slurry flowing out of the orifice of the drill hole, pumping the waste cement slurry into a slurry purification device for filtration treatment, returning useful cement slurry components after filtration into a cement slurry stirring pool, performing reconstitution and stirring to form cement slurry meeting design requirements, and then pressurizing the cement slurry by a high-pressure pump and spraying the cement slurry into the drill hole again from a drill rod nozzle of a rotary jet drilling machine or a stirring jet drilling machine through a pipeline system. The invention has the advantages that the waste cement paste is recycled by filtering and re-preparing the waste cement paste, the waste of materials and the pollution to the environment are reduced, and the cost for transporting and treating the waste cement paste is reduced.

Description

Waste slurry recycling and circulating system for rotary spraying pile or stirring spraying pile

Technical Field

The invention relates to the technical field of construction of jet grouting piles, in particular to a waste slurry recycling and circulating system for a jet grouting pile or a mixing jet grouting pile.

Background

The jet grouting method is also called as jet grouting method, is called as jet grouting for short, is called as jet grouting pile for short, is started from the high-pressure jet grouting method in the seventies of the twentieth century, and is comprehensively developed and applied in China in the eight and ninety years. The practice proves that the method has good effects on treating silt, mucky soil, cohesive soil, silt, sandy soil, artificial filling, gravelly soil and the like.

The jet grouting pile is characterized in that a jet grouting pipe and a nozzle are drilled to the designed height of the bottom of the pile by 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 jet grouting 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 a foundation is reinforced.

In the existing rotary spraying technology, cement slurry which is sprayed at high pressure and has large flow rate can not be completely absorbed by stratum under normal conditions, and hole mouth slurry return with a certain proportion can occur; especially in relatively hard sandy gravel stratum, in order to obtain larger pile diameter, more pressure and flow are needed, and the proportion of the hole return slurry is higher. If the returned cement slurry is not treated, environmental pollution and material waste are caused.

The applicant applies for an invention patent with application number of 2019106782950 in 2019, 7 and 25, and the invention name is a construction method of a large-diameter high-verticality jet grouting pile in an ovoid macadam stratum, and the specific construction method comprises the following steps: drilling by using a down-the-hole hammer drilling process, loosening peripheral pebbles under the impact action of a hammer head, blowing out debris in the pebble layer around the drill hole, wherein the diameter of the drill hole is 273-800 mm; the full length of the steel casing is followed; pulling out the drill bit, and putting down the temporary thin-wall PVC pipe; pulling out the steel casing, and supporting the hole wall by the thin-wall PVC pipe; putting a high-pressure rotary spraying drill rod to the bottom of the hole, spraying high-pressure cement slurry and high-pressure gas from the side surface of the drill rod, crushing the thin-wall PVC pipe at the corresponding position into fine fragments, collapsing the loose pebble ring body and falling into the range of the drilled hole, cutting and disturbing the collapsed pebbles by the high-pressure high-flow cement slurry and the high-pressure gas, further enlarging the collapsed diameter, and filling gaps of the pebbles with the cement slurry; and lifting the rotary spraying drill rod and continuing to perform rotary spraying to the designed height, and forming the large-diameter jet grouting pile after the cement slurry is solidified. The technical scheme can form the large-diameter high-verticality jet pile in the gravel stratum, and solves the technical problem which is not overcome in the field for a long time. However, in the construction process of the method, in order to obtain a large pile diameter in a hard sandy gravel stratum, a high-power high-pressure grouting pump, a large-diameter nozzle and high-flow cement slurry are adopted, and the capability of absorbing the cement slurry of the stratum within the injection influence range is limited, so that a large amount of cement slurry overflows from a drilling hole, and the overflowing cement slurry needs to be treated in order to avoid great waste and reduce pollution to the environment.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a waste slurry recycling and circulating system for a rotary spraying pile or a stirring spraying pile, which has the advantages of realizing the recycling of waste cement slurry, and reducing the waste of materials and the pollution to the environment.

The above object of the present invention is achieved by the following technical solutions: and collecting the waste cement slurry flowing out of the hole orifice of the drill hole, pumping the waste cement slurry into cement slurry purification equipment for filtration treatment, returning useful cement slurry components after filtration into a cement slurry stirring pool, performing reconstitution and stirring, pressurizing by a high-pressure pump, and spraying the slurry into the drill hole again from a drill rod nozzle of a rotary jet drilling machine or a stirring jet drilling machine through a pipeline system.

Through the technical scheme, the waste cement paste is subjected to filtering treatment and re-preparation, so that the waste cement paste can be recycled, the waste of materials and the pollution to the environment are reduced, and the cost for transporting the waste cement paste outside is reduced.

The invention is further configured to: pumping the waste cement slurry into a cement slurry purification device, filtering coarse particles through a coarse screen, and feeding the filtered waste slurry into a slurry storage pool; the slurry pump pumps the waste cement slurry in the slurry storage tank into a cyclone for solid-liquid separation, the separated slag enters a fine screen for vibration dehydration, the dehydrated slag is discharged, and the dehydrated slurry flows back into the slurry storage tank again; the waste cement slurry separated by the cyclone is slurry without sand and with the particle size of 30-60 mu m, and the slurry is discharged from the cement slurry purifying equipment and enters a cement slurry stirring tank for reconstitution and stirring.

Through the technical scheme, the grout which does not contain sand and has the grain diameter of 30-60 mu m is separated by the grout purifying equipment, so that the grout can achieve the same water stopping effect as the conventional grout.

The invention is further configured to: and a stirring system is arranged in the slurry storage tank and is used for stirring the waste cement slurry.

Through above-mentioned technical scheme, because the useless thick liquid of cement appears precipitating easily and influences the system operation, can prevent the useless thick liquid of cement behind the increase mixing system and deposit in the coagulation of storing up the thick liquid pond for the operation of whole recovery circulation system is smooth and easy high-efficient more, guarantees the continuity of stake.

The invention is further configured to: the fine screen is vibrated by two vibrating motors which are one big and one small, the big motor is positioned at the feed end of the fine screen, and the small motor is positioned at the discharge end of the fine screen.

Through above-mentioned technical scheme, the grout slag charge on the fine screen cloth also removes to the sieve case discharge end comparatively easily when obtaining abundant vibratory screening to reduce the condition that the grout slag charge blockked up the screen cloth.

The invention is further configured to: adding water or cement or newly prepared cement slurry into the cement stirring pool, detecting the specific gravity of the prepared cement slurry by using a hydrometer, pumping the prepared cement slurry into a drill rod of a rotary jet drilling machine or a stirring jet drilling machine again at high pressure after the specific gravity of the prepared cement slurry reaches the design requirement, and spraying the cement slurry into a stratum around a drill hole from a nozzle at the bottom of the drill rod.

By the technical scheme, the specific gravity of the cement paste is reduced by adding water, and the specific gravity of the cement paste is increased by adding cement.

The invention is further configured to: sampling the cement slurry re-prepared in the cement stirring tank to prepare a test block, and detecting the strength and the permeability.

By the technical scheme, whether the cement paste meets the design requirement or not is judged through detecting the strength and the permeability of the test block, and the pile forming quality is controlled.

The invention is further configured to: the recovery circulation system is used for the construction of the rotary spraying pile or the stirring spraying pile in a sand layer or a pebble stratum.

By the technical scheme, as the amount of fine clay particles carried in the returned slurry in the sand layer or the sandy gravel stratum is small, relatively pure cement slurry can be obtained after screening and filtering the waste cement slurry, and the pile forming quality is higher.

The invention is further configured to: the cement slurry mixing pool has at least three sets, the slurry discharged by the cement slurry purifying equipment enters one empty cement slurry mixing pool, the second cement slurry mixing pool is used for preparing the cement slurry again, and the prepared cement slurry in the third cement slurry mixing pool is pumped into the drill hole by the second high pressure pump.

Through the technical scheme, the slurry outlet of the cement slurry purifying equipment, the slurry inlet of the rotary spraying drill rod and the reconfiguration of the cement slurry are not interfered with each other, so that the circulation is more efficient, and the quality of the cement slurry pumped into the drilled hole is more reliable.

In conclusion, the invention has the following beneficial effects:

1. the invention realizes the recovery and the reutilization of the waste cement slurry, and reduces the waste of materials and the pollution to the environment;

2. the whole circulating system can run more smoothly by arranging the stirring system in the slurry storage tank, arranging the large motor and the small motor on the fine screen and arranging the three stirring tanks, so that the shutdown phenomena such as equipment blockage are prevented, the cement slurry can be continuously sprayed into the drill hole, and the circulating efficiency is improved;

3. the quality of the cement slurry after being re-prepared is controlled by adopting specific gravity detection and detection of the strength and permeability of the test block, so that the pile forming quality is ensured.

Drawings

FIG. 1 is an overall schematic view of a waste slurry recovery cycle system;

FIG. 2 is a schematic view of the internal circulation of a cement slurry purification apparatus;

FIG. 3 is a schematic diagram of different functional structures of three cement slurry mixing tanks;

FIG. 4 is a schematic view of the construction of a cement slurry purification apparatus;

FIG. 5 is a schematic view showing the structure of the slurry reservoir and the stirring device;

FIG. 6 is a schematic view of the structure of the stirring apparatus;

FIG. 7 is a schematic structural view of the stirring assembly;

FIG. 8 is a schematic view showing the structure of a backwash water pipe under a fine mesh screen in a highlighted manner.

Reference numerals: 1. a body; 11. a frame; 12. a pulp storage tank; 121. fixing the rod; 122. mounting a plate; 123. mounting a rod; 124. a mounting ring; 125. a stirring assembly; 1251. a rotating shaft; 1252. a strut; 1253. a stirring blade; 1254. a second motor; 1255. a belt; 13. a cover plate; 14. vibrating screen; 141. a screen box; 1411. a cross bar; 1412. a mounting seat; 143. a vibration spring; 144. an ear plate; 145. a first vibration motor; 146. a second vibration motor; 2. a first motor; 3. installing a shaft; 4. a stirring device; 41. a first blade; 42. mounting the cylinder; 421. a through hole; 43. a connecting rod; 44. a second blade; 5. a support bar; 6. a water pipe; 7. a water source; 81. cofferdam; 82. a first mud pump; 83. coarse screening; 84. a fine screen; 85. a second mud pump; 86. a swirler; 87. a vibration motor; 88. a cement slurry purification device; 91. a first stirring tank; 92. a second stirring tank; 93. thirdly, stirring; 94. a cement slurry stirring tank; 95. and a third mud pump.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in figure 1, in the rotary spraying or stirring spraying construction process, cement waste slurry continuously flows out from a drilling hole, a cofferdam 81 is arranged at the drilling hole to enclose and collect the cement waste slurry, a first slurry pump 82 is arranged in the cofferdam 81, and the cement waste slurry flowing out from the drilling hole is collected by the first slurry pump 82 and pumped into a cement slurry purification device 88. Referring to fig. 2, after entering the cement slurry purification device 88, the cement slurry passes through the coarse screen 83 to filter coarse particles, and the filtered waste slurry enters the slurry storage tank 12; a stirring system is arranged in the slurry storage tank 12, and is used for continuously stirring the waste cement slurry to prevent the waste cement slurry from precipitating and solidifying; the second slurry pump 85 pumps the cement waste slurry in the slurry storage tank 12 into a cyclone 86 for solid-liquid separation, cement slurry slag with the particle size of 60-200 mu m enters a fine screen 84 for vibration dehydration, the dehydrated slag is discharged from the discharge end of the fine screen 84, and the dehydrated slurry flows back into the slurry storage tank 12 again. To reduce clogging of the fine screen 84, the fine screen 84 is vibrated by two vibrating motors 87, one large and one small, the large motor being located at the feed end of the fine screen 84 and the small motor being located at the discharge end of the fine screen 84, so that the cement clinker is more easily moved toward the discharge end of the screen box 141.

Referring to fig. 1 and 2, the waste cement slurry separated by the cyclone 86 is a slurry containing no sand and having a particle size of 30 to 60 μm, and is discharged from the slurry cleaning apparatus 88 into the slurry stirring tank 94. Referring to fig. 1 and 3, there are three cement slurry mixing tanks 94, and each cement slurry mixing tank 94 is in communication with the cement slurry cleanup device 88 and the third mud pump 95 via piping. The grout discharged from the grout cleaning equipment 88 enters the empty first stirring tank 91, the grout is prepared again in the second stirring tank 92, and the cement grout prepared in the third stirring tank 93 is pressurized by the third mud pump 95 and then sprayed into the drill hole again from the drill rod nozzle of the jet grouting drilling machine or the jet grouting drilling machine through the pipeline system.

The initial slurry in the second mixing tank 92 is measured for specific gravity using a gravimeter and when the slurry specific gravity is below the design specific gravity, cement is added to the tank until the newly formulated cement slurry specific gravity is equal to the design specific gravity. When the specific gravity of the grout is higher than the designed specific gravity, water is added into the pool, so that the specific gravity of the grout is adjusted to the designed specific gravity. And continuously stirring the slurry in the tank during the reconstitution process. And after the cement slurry is adjusted to the designed specific gravity, sampling the cement slurry to prepare a test block, and detecting the strength and the permeability of the test block after standard maintenance.

The invention realizes the recovery and the reutilization of the waste cement slurry, and reduces the waste of materials and the pollution to the environment. The recovery circulation system is particularly suitable for the construction of the rotary spraying pile or the stirring spraying pile in a sand layer or a pebble stratum, and reduces the cost of outward transportation and treatment of waste mud.

An improved mud purification apparatus for effecting the filtration of cement waste slurries is specifically disclosed below. The following description focuses on the improvement of the prior art apparatus, which mainly comprises a stirring system in the stock chest 12, a motor for driving the fine screen 84 to vibrate, and a back flushing pipe 6 disposed under the screen.

As shown in figure 4, a grout clarification plant includes body 1, and body 1 includes frame 11, storage thick liquid pond 12 and apron 13, and storage thick liquid pond 12 pool mouth upwards offers and fixes on frame 11, and the length of apron 13 is unanimous with storage thick liquid pond 12 length and the width is less than the width in storage thick liquid pond 12, and one side of apron 13 length direction flushes and fixes in storage thick liquid pond 12 pool mouth department with one side of storage thick liquid pond 12 length direction.

Referring to fig. 5, two fixing rods 121 parallel to each other are fixedly disposed on the pulp storage tank 12, and a mounting plate 122 is fixedly disposed on the two fixing rods 121. The stirring system further comprises a first motor 2, an installation shaft 3 and a stirring device 4, wherein the first motor 2 is fixedly arranged on the installation plate 122, an output shaft of the first motor 2 vertically penetrates through the installation plate 122, the vertical arrangement of the installation shaft 3 and the upper end of the installation shaft are connected with the output shaft of the first motor 2 through a coupler, the installation shaft 3 is arranged in the slurry storage tank 12 in a suspending manner, the stirring device 4 is fixedly arranged on the installation shaft 3, and when the first motor 2 drives the installation shaft 3, the stirring device 4 can rotate in the slurry storage tank 12.

Can hang first motor 2 stably to install in storage thick liquid pond 12 top through setting up of two dead levers 121 and mounting panel 122, make first motor 2 provide comparatively stable connection to installation axle 3, simple structure uses comparatively stably. In addition, the staff can also be convenient for observe the grout in the grout storage tank 12 through the clearance between two dead levers 121, and the staff of being convenient for masters the state of grout in the grout storage tank 12 in real time.

When storing up when having grout in the thick liquid storage tank 12, tentatively purify grout earlier, switch on first motor 2's power, first motor 2 drives installation axle 3 and drives agitating unit 4 and rotate, makes agitating unit 4 stir a large amount of grout in to the thick liquid storage tank 12. Along with agitating unit 4's operation, the less slag charge of a large amount of particle diameters is difficult to produce along with agitating unit 4's stirring in the grout and deposits, and the grout is also difficult for solidifying in storing up thick liquid pond 12 simultaneously to make the grout in storing up thick liquid pond 12 discharge smoothly, reduce the staff and to the grout clearance degree of difficulty that solidifies in storing up thick liquid pond 12.

Referring to fig. 6, the stirring device 4 includes two stirring fins having a frame structure, each stirring fin includes a bottom beam and two reinforcing beams, the bottom beam is disposed perpendicular to the mounting shaft 3, the mounting shaft 3 passes through the center of the bottom beam, the two reinforcing beams are disposed on two sides of the mounting shaft 3 in an inclined manner, one end of each reinforcing beam is fixed to the mounting shaft 3, and the other end of each reinforcing beam is fixed to a position near the end of the bottom beam. In order to improve the scattering effect of the two stirring fins, the two stirring fins are arranged in a 90-degree crossed manner, and the bottom beam of one stirring fin penetrates through a frame space formed by the bottom beam of the other stirring fin and the two reinforcing beams.

Refer to fig. 5, during the in-service use, grout is detained bottom edge in storing up thick liquid pond 12 easily, the grout of detaining here is difficult to take out, long-time back of using, can be at the more cement that solidifies of bottom edge accumulation of storing up thick liquid pond 12, lead to the storage thick liquid capacity reduction of storing up thick liquid pond 12, reduce the purification efficiency to grout, for this reason, all process the edge of bottom in the thick liquid pond 12 for the fillet, the fillet is for there being the corner of buckling firmly, can reduce the possibility that grout is detained, and then can effectively reduce the condition that grout is detained in storing up thick liquid pond 12 bottom and solidifies.

Referring to fig. 5 and 7, a stirring assembly 125 is further disposed in the slurry storage tank 12 and used for auxiliary stirring of the cement slurry, a mounting rod 123 is horizontally fixed in the slurry storage tank 12, two ends of the mounting rod 123 are fixed on an inner wall of the slurry storage tank 12, a mounting ring 124 is fixed at a central position of the mounting rod 123, an axial direction of the mounting ring 124 is parallel to a length direction of the slurry storage tank, the stirring assembly 125 includes a rotating shaft 1251, a supporting rod 1252, a stirring blade 1253, a second motor 1254 and a belt 1255, the rotating shaft 1251 is horizontally disposed, one end of the rotating shaft 1251 is mounted in the mounting ring 124, the other end of the rotating shaft 1251 penetrates through one end of the slurry storage tank 12 far away from the stirring device 4, the rotating shaft 1251 can rotate around an axial line thereof, the supporting rod 1252 is provided with a plurality of supporting rods 1252, the plurality of supporting rods 1252 are uniformly fixed on the rotating shaft. Stirring vane 1253 is helical blade and is provided with two, and two stirring vanes 1253 are fixed respectively on many spinal branch 1252, and second motor 1254 fixed mounting is outside storage pulp chest 12, and belt 1255 is connected on the output shaft of second motor 1254 and is penetrated one end of storage pulp chest 12 with pivot 1251.

During the use, switch on second motor 1254's power, second motor 1254 drives pivot 1251 through belt 1255 and rotates, can not form under the prerequisite that hinders to agitating unit 4 for two stirring vane 1253 can assist the stirring to keeping away from agitating unit 4 stirring area's grout in storing up thick liquid pond 12, further reduce the possibility that the interior slag charge of grout deposits.

Referring to fig. 4, the body 1 further includes a vibrating screen 14, the vibrating screen 14 includes a screen box 141, a fine screen 84, a coarse screen 83, a vibrating spring 143, an ear plate 144, a first vibrating motor 145 and a second vibrating motor 146, and an opening is respectively opened at an upper portion of the screen box 141 and at one end in the discharging direction. The vibrating springs 143 are arranged in four and all vertical positions, and the lower ends of the four vibrating springs 143 are fixed on the frame 11 and are uniformly distributed. The ear plates 144 are horizontally provided with four and uniformly fixed at two sides of the material conveying direction of the screen box 141, the upper ends of the four vibrating springs 143 are fixedly connected at the lower parts of the four ear plates 144, and the lower ends of the vibrating springs 143 are fixedly connected on the frame 11 and the cover plate 13. Two parallel cross rods 1411 are arranged on the upper portion of the screen box 141, two ends of each cross rod 1411 are respectively fixed to the upper portion of the screen box 141, the length direction of each cross rod 1411 is perpendicular to the discharging direction of the screen box 141, and the mounting seats 1412 are horizontally and fixedly mounted on the two cross rods 1411. The first vibrating motor 145 can use a vibrating motor with rated power of 1.80KW, the second vibrating motor 146 can use a vibrating motor with rated power of 3.20KW, the first vibrating motor 145 and the second vibrating motor 146 are both fixedly mounted on the mounting base 1412, and the first vibrating motor 145 is close to the discharge hole of the vibrating screen 14.

Two horizontal poles 1411 are fixed on sieve case 141, increase the structural strength between horizontal pole 1411 and the sieve case 141, can provide comparatively stable support to great first vibrating motor 145 of weight and second vibrating motor 146, and mount 1412 provides comparatively steady installation basis to first vibrating motor 145 and second vibrating motor 146 for first vibrating motor 145 is more stable with second vibrating motor 146 during simultaneous operation.

After the cement slurry enters the screen box 141 through the upper opening of the screen box 141, the first vibration motor 145 and the second vibration motor 146 work simultaneously to generate vibration, and since the power of the first vibration motor 145 is smaller than that of the second vibration motor 146, when the first vibration motor 145 and the second vibration motor 146 work simultaneously, the vibration amplitude of the end of the screen box 141 close to the second vibration motor 146 is larger than that of the end of the screen box 141 close to the first vibration motor 145, and then the second vibration motor 146 gives a component force to the screen box 141 towards the discharge port end in the horizontal direction, under the restriction action of the vibration spring 143 at the discharge end of the screen box 141, the end of the discharge port of the screen box 141 has a downward inclined movement trend, so that the screen box 141 is easy to form a more obvious inclined condition towards the discharge port end thereof from the horizontal state, and the cement slurry on the fine screen 84 and the coarse screen 83 is sufficiently vibrated and screened, and also moves towards the discharge port end of the screen box 141 more easily, thereby reducing the occurrence of the blocking of the fine screen 84 and the coarse screen 83 by the cement slurry slag.

Referring to fig. 4 and 8, the cement paste purification apparatus 88 further includes a support rod 5, a water pipe 6, and a water source 7.

The horizontal of bracing piece 5 is provided with many, and the both ends of every bracing piece 5 are fixed on the inner wall of sieve case 141 and are located the below of fine screen 84, and 6 levels of water pipe spiral are fixed on bracing piece 5, and the one end of water pipe 6 is the blind end, and the other end is connected with external high-pressure water source 7. The pipe wall of the part of the water pipe 6 below the fine screen 84 is provided with a plurality of water outlet holes at equal intervals, and the water outlet holes face the fine screen 84 above. By intermittently turning on the high pressure water source 7, the water pipe 6 sprays water to the fine mesh screen 84, and the mesh is backwashed, thereby further preventing clogging of the mesh. Furthermore, a set of back washing water pipes 6 can be arranged at the bottom of the coarse screen 83.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the principles of the present invention should be covered by the protection scope of the present invention.

Claims (8)

1. The utility model provides a spout stake soon or stir and spout stake waste mortar recovery cycle system which characterized by: the waste cement slurry flowing out of the hole opening of the drill hole is collected and pumped into cement slurry purification equipment (88) for filtration treatment, useful cement slurry components after filtration are returned into a cement slurry stirring pool (94) for reconstitution and stirring, and then the waste cement slurry is pressurized by a high-pressure pump and sprayed into the drill hole again from a drill rod of a rotary jet drilling machine or a stirring jet drilling machine.

2. The system of claim 1, wherein the system comprises: pumping the waste cement slurry into a cement slurry purification device (88), filtering coarse particles through a coarse screen (83), and feeding the filtered waste cement slurry into a slurry storage pool (12); the slurry pump pumps the waste cement slurry in the slurry storage tank (12) into a cyclone (86) for solid-liquid separation, the separated slag enters a fine screen (84) for vibration dehydration, the dehydrated slag is discharged, and the dehydrated slurry flows back into the slurry storage tank (12) again; the waste cement slurry separated by the cyclone (86) is a slurry which does not contain sand and has a particle size of 30-60 mu m, and the slurry is discharged from a cement slurry purifying device (88) and enters a cement slurry stirring tank (94) for reconstitution and stirring.

3. The system of claim 2, wherein the system comprises: a stirring system is arranged in the slurry storage tank (12) and is used for stirring the waste cement slurry.

4. The system of claim 3, wherein the system comprises: the fine screen (84) is vibrated by two vibrating motors (87) of a large one and a small one, the large motor being located at the feed end of the fine screen (84), and the small motor being located at the discharge end of the fine screen (84).

5. The system of claim 4, wherein the system comprises: adding water or cement or newly-prepared cement slurry into the cement stirring pool, detecting the specific gravity of the prepared cement slurry by using a hydrometer, pumping the prepared cement slurry into the rotary spraying or stirring spraying drill rod again at high pressure after the specific gravity of the designed requirement is met, and spraying the cement slurry into the stratum around the drill hole from a nozzle at the bottom of the drill rod.

6. The system of claim 4, wherein the system comprises: sampling the cement slurry re-prepared in the cement stirring tank to prepare a test block, and detecting the strength and the permeability.

7. The system of claim 4, wherein the system comprises: the recovery circulation system is used for the construction of the rotary spraying pile or the stirring spraying pile in a sand layer or a pebble stratum.

8. The system of claim 4, wherein the system comprises: the cement slurry mixing tanks (94) are at least three sets, the slurry discharged by the cement slurry purifying equipment (88) enters one empty cement slurry mixing tank (94), the second cement slurry mixing tank (94) is used for preparing the cement slurry again, and the prepared cement slurry in the third cement slurry mixing tank is pumped into the drill hole by a second high-pressure pump.

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