CN102561950A - Process for realizing grouting consolidation for aggregates filled in cavities of strata and jetting drill bit - Google Patents

Abstract

The invention discloses process for realizing grouting consolidation for aggregates filled in cavities of strata. Holes are drilled by a drill stem, and hydraulic cement is filled in the holes, so that filling of the aggregates is finished. The invention further discloses a jetting drill bit for realizing grouting consolidation for the aggregates filled in the cavities of the strata. The jetting drill bit consists of an upper joint, a jetting body and a drill bit body which are connected successively. Grouting consolidation operation is well carried out for aggregate accumulators filled in the cavities of the strata, so that the aggregates form a plain concrete body and have certain strength and stability, the plain concrete body is equivalent to an artificially constructed false stratum, the drilled holes assuredly penetrate through the cavities of the strata smoothly, and conditions are created for safe and smooth construction of the drilled holes.

Description

A technique for grouting and consolidating aggregates filled in formation cavities and a jet drill bit

technical field

The invention relates to a technique for grouting and consolidating aggregates filled in stratum cavities and a jet drill bit, belonging to the fields of geological exploration, water disaster prevention and control, basic construction and the like in mines, traffic tunnels, water conservancy and hydropower.

Background technique

At present, mine water disaster accidents, especially coal mine water disaster accidents, are one of the main accidents that affect the safety of employees and the economic benefits of mines. Coal mine water seepage accidents continue to occur every year. In the old mining areas that are seriously threatened by the Ordovician limestone water in the coal seam floor, especially in the old mining areas where the lower formation coal has been mined and the upper formation coal has formed a coal seam goaf, hydrological observation of the coal seam floor aquifer, mine well Grouting is used to block water in the water-filled aquifer after water inrush. The coal seam threatened by water needs to be strengthened and reconstructed by floor grouting before mining. When underground drainage holes need to be constructed for drainage drilling or cable drilling, ground drilling often requires Passing through the coal goaf of the upper group, the existence of the goaf has brought great difficulties to drilling construction; in the southern area where karst karst is developed, geological exploration drilling often encounters large karst cavities. Drilling in these goafs and cavities often leads to drilling deviation accidents, buried drilling accidents caused by collapse and falling of blocks in the cavities, jamming accidents caused by dislocation of the drilling holes on the roof and floor of the cavities, accidents where the original drilling holes cannot be found, and drilling accidents. Drilling accidents in the groove of the hollow roof, drilling accidents in which the drill pipe was thrown off in the hollow, or accidents in which the isolation sleeve was swept off the drill bit in the hollow and the construction was completely lost in flushing fluid. In order to reduce and eliminate the above-mentioned accidents, it is sometimes necessary to fill the cavity with aggregate and consolidate the aggregate accumulation body by grouting to artificially create false strata to ensure safe and smooth drilling. In addition, in some grouting water blocking projects, it is necessary to fill aggregates into the water passageway through ground drilling and grout and consolidate the aggregate accumulation to intercept and block the roadway water flow and ensure the success of grouting water blocking .

Contents of the invention

Aiming at the above-mentioned prior art, the present invention provides a process for grouting and consolidating aggregates filled in formation cavities, and a jet drill bit used therein.

The present invention is realized through the following technical proposals (take the aggregate accumulation process of filling in the coal mine goaf as an example, and other processes of grouting and consolidation of the aggregates filled in the stratum cavity are the same):

A technique for grouting and consolidating aggregates filled in formation cavities, the steps of which are as follows:

(1) First, according to the depth of the lower interface of the goaf and the depth of the upper surface of the aggregate accumulation body, calculate the total length of the required drill pipes (drill pipe strings connected by single drill pipes), and calculate According to the number of required single drill rods, select the single drill rods that can be matched, arrange them in order, and reserve them; The sequence of the drill pipes is suspended and lowered into the drill hole with the lifter and the wire rope in turn. The drill pipe must be inserted into the rotator of the drilling rig, and the rotary torque of the drill pipe is provided by the drilling rig;

(2) When the jet drill bit is 1-1.5m away from the upper surface of the aggregate accumulation body, stop lowering the drill pipe. The upper end of the drill pipe is connected to the water joint and high-pressure rubber hose, and then connected to the grouting pump. At this time, the drill pipe is still being lifted device and wire rope suspension;

(3) Send power to the grouting pump switch to make the grouting pump run. The grouting pump injects water into the grouting pipeline formed by the water joint, high-pressure rubber hose, drill pipe and jet drill bit, and check whether the grouting pipeline is unblocked;

(4) After water injection checks that the grouting pipeline is unblocked, use a grouting pump to pour liquid cement through the grouting pipeline, and the cement is sprayed out from the jet drill bit, and then the drilling rig is started to drive the drill pipe and the jet drill bit to rotate through the rotator of the drilling rig, and use The drill pipe is lowered by the lifter and the wire rope hoisting device, and the jet drill bit slowly enters the aggregate accumulation body under the action of gravity of the drill pipe, and the liquid cement spreads around in the gaps of the aggregate particles;

(5) Keep the drill pipe and the jet drill bit continuously rotating and moving up and down, and gradually move downward from the upper surface of the aggregate accumulation body until the depth of the goaf floor (bottom of the goaf fall), and then slowly go up Lifting the rotary drill pipe drives the jet drill bit to move upward; this step is repeated, and when the jet drill bit is felt to move up and down smoothly in the aggregate accumulation body and the goaf without resistance, the grouting consolidation operation is over and it is consolidated by cement. The aggregate is called plain concrete;

(6) After the grouting consolidation operation is completed, lift the jet drill bit to 1-1.5m above the upper surface of the plain concrete consolidated by cement, stop lifting the drill pipe, keep the drill pipe still, and use the grouting pump to inject Pump a certain amount of clean water into the grouting pipeline to flush the residual cement in the grouting pipeline;

(7) Open the gyrator of the drilling rig, lift the drill pipe, disassemble the single drill pipes that make up the drill pipe one by one, and finally lift all the single drill pipes and jet drill bits out of the drilling hole.

The technical points of the above-mentioned process have the following points:

① All threaded connection parts are required to be wrapped with veil, threaded oil, and tightened, and there should be no water leakage at the threaded thread of the drill pipe.

② When lowering the drill pipe and jet drill bit for the first time, when the upper surface of the aggregate accumulation body is about 5m away, the lowering speed should be slowed down, and the lowering drill must be stopped when the upper surface of the aggregate accumulation body is 1-1.5m Rod, to prevent drilling down too fast Insert the jet drill bit into the aggregate accumulation body, so that the aggregate particles block the jet drill bit.

③The rotator of the drilling rig must not stop rotating, and the drill pipe and jet drill bit must not stay in the aggregate accumulation body. It is strictly forbidden to directly lift the drill pipe upward without rotating the drill pipe, so as to prevent the drill from being stuck and buried.

④According to the solidification time of the cement slurry, the drill bit can be lowered to test the consolidation strength of the plain concrete. When the consolidation strength and stability of the plain concrete meet the requirements of drilling in it without collapsing and falling blocks, you can continue to drill down , otherwise perform the grouting consolidation operation again.

⑤During the construction, each shift should lift the drill pipe and jet drill bit out of the drilling hole through the lifter and wire rope for inspection, check their grinding condition, and replace or repair the seriously worn drill pipe and jet drill bit in time.

⑥ No matter what kind of grouting consolidation material is used, it is necessary to ensure that the solidification time of the material can meet the time requirements of the grouting operation, and the phenomenon of cement solidification in the grouting pipeline must not occur.

⑦ After grouting, the amount of water injected into the grouting pipeline is 3 times the volume of the grouting pipeline.

The requirements for the preparation of materials for grouting the aggregate accumulation body in the coal seam goaf by the above process are as follows:

① Generally, PO.32, 5R or PO.42, 5R Portland cement is used for cement, and the density of cement slurry is generally controlled at 1.4-1.6kg/cm ² , and the quality of cement must be qualified.

② During the preparation of cement slurry, it must be stirred evenly, and there must be no agglomeration and cement lumps.

③ If necessary, add water glass to the cement slurry at a ratio of 0.3 to 0.5% by volume, stir evenly, and use a single-liquid grouting pump to spray out through the grouting pipe and jet drill bit, and enter between the aggregate particles of the aggregate accumulation body , mixed with aggregate particles.

④The grouting pump volume should generally not exceed 100L/min.

⑤ During grouting, the drill pipe must not stay in the drill hole, and must not stay in the aggregate accumulation body.

A jet drill bit used for grouting and consolidation of aggregates filled in formation cavities, including an upper joint, a jet body and a drill bit body connected in sequence, wherein the upper joint is made of a drill pipe pin joint, and the drill pipe The cylindrical surface of the pin joint is inlaid with strip-shaped hard alloy fragments along the axial direction; the injection body is made of the box joint of the drill pipe, and the spray holes are evenly arranged on the non-threaded parts of the box joint of the drill pipe. In the axial direction of the rod box joint, the strip-shaped hard alloy fragments are welded between adjacent injection holes, and the thickness of the strip-shaped hard alloy fragments is not less than 5mm; the drill bit body is processed by round steel with the same diameter as the drill pipe joint. One end is processed into a drill pipe joint screw (male button), the other end is radially welded with several pieces of drill bit body fins (triangular fins), and the three sides of the drill bit body fins are welded with hard alloy fragments along the hypotenuse. Along the axial direction of the end of the drill body, a number of drill water holes communicated with the spray holes are arranged between the adjacent drill body fins, and the drill water holes are evenly distributed; the threaded part of the drill body is connected with the spray body.

The main technical points of the above-mentioned jet drill bit are as follows:

①The welding of cemented carbide fragments is distributed in strips, the strip width is about 10-20mm, and the thickness is about 5-10mm, and it can be flexibly selected according to the diameter of the drill bit, the position of the wing of the drill body and the position of the annular shoulder of the drill body.

②Cemented carbide fragments are recycled and broken from cemented carbide waste drill bits. The material is YG6 or YG8. The welding process is the same as that of cemented carbide drill bits. It is required that the surface of the cemented carbide sintered body at the welding part is even and the thickness is consistent.

③The upper joint and the drill pipe thread connected to it should match.

④The strip-shaped cemented carbide fragments welded on the upper joint and the spray body should be consistent with the number of drill bit body fins. The number of drill bit body fins can be selected and processed into 3 pieces or 4 pieces or more according to the diameter of the drill bit.

⑤ The diameter of the injection hole and the water hole of the drill bit is generally 6-12mm.

⑥ After connection, the outer diameters of the rotary track of the upper joint, jet body and drill body are the same.

⑦ When the diameter of the drill bit body allows, block cemented carbide can be used instead of cemented carbide fragments.

⑧The diameter of the drill body shall not be greater than the minimum diameter of the drilled hole, and it can pass through the drilled hole smoothly.

The beneficial effects of the present invention are: it is better to solve the grouting and consolidation operation of the aggregate accumulation body filled in the ground cavity, so that the aggregate body forms a plain concrete body, and has a certain strength and stability, It is equivalent to artificially constructing a false stratum, which ensures that the borehole passes through the stratum cavity smoothly, and creates conditions for the safe and smooth construction of the borehole.

Description of drawings

Figure 1 is a schematic diagram of the operation process steps of grouting and consolidation of the aggregate accumulation body filled in the coal mine goaf (the drill pipe is drilled into the aggregate accumulation body).

Figure 2 is a schematic diagram of the operating process steps of grouting and consolidation of the aggregate accumulation body filled in the goaf of the coal mine (the drill pipe is drilled into the goaf).

Fig. 3 is a schematic diagram of the structure of the jet drill.

Fig. 4 is a view from direction A in Fig. 3 .

Fig. 5 is a view from direction B in Fig. 3 .

Among them, 1. Drill pipe rotation direction; 2. Drill pipe string movement direction; 3. Drill rig gyrator; 4. Drill pipe; 5. Cement slurry flow direction in drill pipe; 6. Jet drill bit; 8. Aggregate accumulation body; 9. Coal seam; 10. Goaf fallout; 11. Coal substratum; 12. Cement slurry diffusion seepage; 13. Drilling; 14. Coal strata; 15. Water joint and high pressure hose ; 16, lifter and wire rope; 17, upper joint; 18, upper joint fin; 19, spray body; 20, spray hole; 21, drill bit water eye; 22, drill bit body; 23, drill bit body fin; 24 , Cemented carbide pieces.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

A technique for grouting and consolidating aggregates filled in formation cavities, the steps of which are as follows:

(1) First, according to the depth of the lower interface of the goaf and the depth of the upper surface of the aggregate accumulation body 8, calculate the total length of the required drill pipe 4 (drill pipe string formed by connecting single drill pipes), and Calculate the number of required single drill rods, select the single drill rods that can be matched, arrange them in order, and reserve them; For a good sequence of single drill pipes, the drill pipe 4 is inserted into the drill rig gyrator 3, and the drill pipe 4 is provided with the rotary torque by the drill rig and the steel wire rope 16 is used to suspend and connect in order to lower it into the borehole 13;

(2) When the jet drill bit 6 is 1 to 1.5m away from the upper surface of the aggregate accumulation body 8, stop lowering the drill pipe 4, and the upper end of the drill pipe 4 is connected to the water joint and the high-pressure hose 15, and then connected to the grouting pump. Bar 4 is still suspended by lifter and wire rope 16;

(3) Send power to the grouting pump switch to make the grouting pump run, and the grouting pump injects water into the grouting pipeline formed by the water joint, high-pressure rubber hose 15, drill pipe 4 and jet drill bit 6, and check the grouting pipeline Whether it is smooth;

(4) After checking that the grouting pipeline is unblocked by water injection, use a grouting pump to pour liquid cement through the grouting pipeline, and the cement will be sprayed out from the injection hole 20 of the jet drill bit 6 and the water hole 21 of the drill bit, and then the drilling rig will be started to rotate through the drilling rig The device 3 drives the drill pipe 4 and the jet drill bit 6 to rotate, and lowers the drill pipe 4 with the lifter and the wire rope 16 hoisting device. The jet drill bit 6 slowly enters the aggregate accumulation body 8 under the gravity of the drill pipe 4, and the liquid cement is Aggregate particle gaps diffuse to the surrounding, as shown in Figure 1;

(5) Keep the drill pipe 4 and the jet drill bit 6 continuously rotating and moving up and down, and gradually move downward from the upper surface of the aggregate accumulation body 8 until the depth of the gob floor (the bottom of the gob 10), such as As shown in Figure 2, then slowly lift up the rotary drill pipe 4 to drive the jet drill bit 6 to move upward; this step is repeated, when the jet drill bit 6 is felt to move up and down smoothly in the aggregate accumulation body 8 and the goaf fallout 10 After there is no resistance, the grouting consolidation operation ends, and the aggregate consolidated by cement is called plain concrete;

(6) After the grouting consolidation operation is finished, lift the jet drill bit 6 to a place 1 to 1.5m above the upper surface of the plain concrete consolidated by cement, stop lifting the drill pipe 4, keep the drill pipe 4 still, and use grouting The pump pumps a certain amount of clean water into the grouting pipeline to flush the residual cement in the grouting pipeline;

(7) Open the drilling rig gyrator 3, promote the drilling rod 4, dismantle the single drilling rods that form the drilling rod 4 one by one, and finally put all the single drilling rods and jet drill bits 6 out of the borehole 13.

The technical points of the above-mentioned process have the following points:

②1 It is required to wrap the veil on all threaded connection parts, apply oil to the threaded thread, and tighten it tightly, and there should be no water leakage at the threaded thread of the drill pipe.

② When lowering the drill pipe 4 and the jet drill bit 6 for the first time, when the upper surface of the aggregate accumulation body 8 is about 5m away, slow down the lowering speed, and when the upper surface of the aggregate accumulation body 8 is 1-1.5m away, Drilling rod 4 must be stopped in order to prevent the jet drill bit 6 from being inserted into the aggregate accumulation body 8 too quickly, so that the aggregate particles can block the drill bit water eye 21 of the jet drill bit 6 .

③Drilling rig rotator 3 must not stop rotating, drill pipe 4 and jet drill bit 6 must not stay in the aggregate accumulation body 8, and it is strictly forbidden to directly lift the drill pipe 4 upward without rotating, so as to prevent stuck drill accidents .

④According to the solidification time of the cement slurry, the drill bit can be lowered to test the consolidation strength of the plain concrete. When the consolidation strength and stability of the plain concrete meet the requirements of drilling in it without collapsing and falling blocks, you can continue to drill down , otherwise perform the grouting consolidation operation again.

⑤During the construction, each shift should lift the drill pipe 4 and the jet drill bit 6 out of the borehole 13 through the lifter and the steel wire rope 16 for inspection, and check its grinding condition. Replace or repair in time.

⑥ No matter what kind of grouting consolidation material is used, it is necessary to ensure that the solidification time of the material can meet the time requirements of the grouting operation, and the phenomenon of cement solidification in the grouting pipeline must not occur.

⑦ After grouting, the amount of water injected into the grouting pipeline is 3 times the volume of the grouting pipeline.

The requirements for the preparation of materials for grouting the aggregate accumulation body in the coal seam goaf by the above process are as follows:

① Generally, PO.32, 5R or PO.42, 5R Portland cement is used for cement, and the density of cement slurry is generally controlled at 1.4-1.6kg/cm ² , and the quality of cement must be qualified.

② During the preparation of cement slurry, it must be stirred evenly, and there must be no agglomeration and cement lumps.

③ If necessary, add water glass to the cement slurry at a ratio of 0.3 to 0.5% by volume, stir evenly, and use a single-liquid grouting pump to spray out from the injection hole 204 of the jet drill 6 and the water hole 21 of the drill bit through the grouting pipeline, and enter Between the aggregate particles of the aggregate accumulation body 8, mix with the aggregate particles.

④The grouting pump volume should generally not exceed 100L/min.

⑤ During grouting, the drill pipe 4 must not stay in the borehole 13, and must not stay in the aggregate accumulation body 8.

A jet drill bit used for grouting and consolidation of aggregates filled in formation cavities, including an upper joint 17, a jet body 19 and a bit body 22 connected in sequence, as shown in Figures 3, 4, and 5, wherein the upper joint 17 is made of the drill pipe pin joint, and the cylindrical surface of the drill pipe pin joint is inlaid with strip-shaped hard alloy fragments 24 along the axial direction; the spray body 19 is made of the drill pipe box joint, Spray holes 20 are evenly arranged on the non-threaded parts of the box joint, and strip-shaped hard alloy fragments 24 are welded between adjacent spray holes 20 along the axial direction of the drill pipe box joint, and strip-shaped hard alloy fragments 24 The thickness is not less than 5mm; the drill bit body 22 is processed from round steel with the same diameter as the drill pipe joint, one end is processed into a drill pipe joint screw (male buckle), and the other end is radially welded with several pieces of drill body fins 23 along the end face (triangular fins), three sides of the hypotenuse of the drill bit body fins 23 are inlaid with cemented carbide fragments 24, and the end of the drill bit body 22 is arranged along the axial direction and between the adjacent drill bit body fins 23 to communicate with the injection hole 19. Some drill bit water eyes 21, the drill bit water eyes 21 are evenly distributed; the threaded part of the drill bit body 22 is connected with the jet body 19.

The main technical points of the above-mentioned jet drill bit are as follows:

①The cemented carbide fragments 24 are welded in strips, the width of the strip is about 10-20 mm, and the thickness is about 5-10 mm. Choose flexibly.

②Cemented carbide fragments 24 are recycled and broken from cemented carbide waste drill bits. The material is YG6 or YG8. The welding process is the same as that of cemented carbide drill bits. .

③The upper joint 17 and the drill pipe thread connected with it should match.

④ The strip-shaped cemented carbide fragments 24 welded on the upper joint 17 and the spray body 19 should be consistent with the number of drill bit body fins 23, and the number of drill bit body fins 23 can be selected and processed into 3 pieces or 4 pieces or more according to the diameter of the drill bit Multiple slices.

⑤The diameters of spray holes 19 and drill bit water holes 21 are generally 6-12mm.

⑥ After the connection, the outer diameters of the rotary track of the upper joint 17, the injection body 19 and the drill bit body 22 are the same.

7. When the diameter of the drill body 22 allows, block cemented carbide can be used to replace the cemented carbide fragments 24.

8. The diameter of the drill bit body 22 must not be greater than the minimum borehole diameter, and can pass through the borehole smoothly.

Example:

At 8:30 on July 1, 2006, when the 10404(2) working face of Jinan Huamei Mining Co., Ltd. was pushed out 40m, water came out. On July 5, the water inrush point of the night shift was 2601m ³ /h, and there was a tendency to continue to increase, flooding the north wing of the mine and causing the north wing to stop production. Aiming at the water outflow situation of the 10th layer coal, a water shutoff plan for grouting and water shutoff boreholes constructed from the ground was formulated. However, according to the analysis of the hydrogeological data of the working face, two of the four designed boreholes (Note 1 and Note 4) respectively pass through the three-layer goaf of Coal 8, Coal 9 and Coal 10, and one borehole (Note 3) It is necessary to pass through the goaf of Coal 8 and Coal 9. Three boreholes were actually constructed, namely Note 1, Note 3 and Note 4.

The depth and thickness of the bottom boundary of the three-layer goaf coal seam are: Coal 8: 205.22m deep, 1.92m thick; Coal 9: 210.70m deep, 1.40m thick; Coal 10: 218.60m deep, 1.80m thick. Among them, the distances between coal 8, coal 9 and coal 10 exposed by drilling holes in note 1, note 3 and note 4 are thinner than normal, 3.75m and 6.63m respectively. Due to the small distance between the gobs of Coal 8, Coal 9 and Coal 10, the coal mining method adopts the roof caving method. If the coal 10 roof caving zone extends to the coal 9 goaf, the coal 9 and coal 10 goafs can be treated as a layer of goaf. Thus, the three-story goaf forms a large space for falling. How to safely and smoothly drill through the coal mine goaf is one of the keys to the success of grouting and water blocking.

The process of the invention is used to implement the grouting and consolidation of the aggregate accumulation body in the goaf. The aggregate accumulation body filled in the goaf was grouted and consolidated by drilling holes such as Note 1, Note 3, and Note 4 respectively, and shared 5.4 tons of PO.32.5R ordinary Portland cement. The consolidation quality meets the requirements, which ensures that the borehole is drilled in the consolidation body, completes the safe and smooth construction of the borehole, and brings great benefits to the water blocking work. On October 17, 2006, the first drill hole, No. 3 hole, safely and smoothly passed through the goaf of the coal mine. After injecting 150 tons of cement into the Ordovician limestone in the water-filled aquifer, the water blocking effect was first seen. On December 16 The water blocking work is successfully completed.

Claims (5)

1. one kind is carried out the technology of grouting reinforcement to the aggregate of filling in the cavity, stratum, and it is characterized in that: step is following:

(1) at first, the degree of depth according to the following interface depth and the aggregate accumulation body upper surface in goaf calculates the total length of required drilling rod, and calculates the radical of required single drilling rod, chooses the single drilling rod that can mate, and sequences order, and is subsequent use; Then; Connect jet bit in the predetermined lower end that is positioned at the single drilling rod of lowermost end, and the single drilling rod order good, hang successively to be connected with elevator and wire rope and be lowered in the boring according to apolegamy; Drilling rod will be inserted in the rig gyrator, and the rotary torque of drilling rod is provided by rig;

(2) when jet bit during apart from aggregate accumulation body upper surface 1～1.5m place, stop to transfer drilling rod, the drilling rod upper end connects water swivel and high-pressure rubber pipe, is connected with grouting pump again, and this moment, drilling rod was still hung by elevator and wire rope;

(3) send electricity for the grouting pump switch, make the grouting pump running, grouting pump water filling in the grouting pipeline that forms by water swivel and high-pressure rubber pipe, drilling rod and jet bit, whether the inspection grouting pipeline is unimpeded;

(4) after water filling check grouting pipeline is unimpeded; Pour into liquid cement with grouting pump through grouting pipeline, cement sprays from jet bit, starts rig then; Drive drilling rod and jet bit revolution through the rig gyrator; And transfer drilling rod with elevator and wire rope boom hoisting, and jet bit slowly enters under the drilling rod action of gravity in the aggregate accumulation body, and liquid cement is diffusion towards periphery in the particles of aggregates space;

(5) keep the continuous revolution of drilling rod and jet bit and string up and down to move, progressively move down extension,, and then carry rotating drilling rod drive jet bit slowly and move up up to the gob floor degree of depth from aggregate accumulation body upper surface; This step is carried out repeatedly, when jet bit in aggregate accumulation body and goaf fall cash smooth and easy up and down do not have resistance after, the grouting reinforcement EO;

(6) behind the grouting reinforcement EO, rise to by cement 1～1.5m place more than the plain concrete upper surface after fixed to jet bit, stop to promote drilling rod, keep drilling rod motionless, in grouting pipeline, pump into clear water, residual cement in the flushing grouting pipeline with grouting pump;

(7) open the rig gyrator, promote drilling rod, the single drilling rod by root dismounting composition drilling rod proposes boring to all single drilling rods and jet bit at last.

2. according to claim 1ly a kind of the aggregate of filling in the cavity, stratum is carried out the technology of grouting reinforcement, it is characterized in that: in the said step (6), use clear water amount that grouting pump pumps into 3 times in grouting pipeline as the grouting pipeline volume.

3. one kind is carried out the used jet bit of grouting reinforcement to the aggregate of filling in the cavity, stratum; It is characterized in that: comprise the top connection, ejectisome and the bit body that connect successively; Wherein, Top connection is made by the drilling rod male joint, at the periphery of drilling rod male joint along axis direction welding-on ribbon carbide alloy fragment; Ejectisome is made by drilling rod box joint; Spray-hole is evenly arranged at non-screw thread position on drilling rod box joint; Along the banded carbide alloy fragment of welding-on between drilling rod box joint axis direction, the adjacent spray-hole, banded carbide alloy fragment thickness is no less than 5mm; Bit body is processed by the round steel identical with the tool joint diameter; One end is processed into the tool joint screw thread; The other end radially welds some bit body fins along end face; Along three seting welding carbide fragments of bit body fin hypotenuse, between axis direction, adjacent bit body fin, be provided with the some bit ports that communicate with spray-hole in the bit body end, bit port evenly distributes; Bit body screw thread part is connected with ejectisome.

4. according to claim 3ly a kind of the aggregate of filling in the cavity, stratum is carried out the used jet bit of grouting reinforcement; It is characterized in that: the ribbon carbide alloy fragment that welds on said top connection and the ejectisome is consistent with bit body fin quantity, and bit body fin quantity is 3 or 4.

5. according to claim 3ly a kind of the aggregate of filling in the cavity, stratum is carried out the used jet bit of grouting reinforcement, it is characterized in that: said bit port diameter is at 6～12mm.

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