CN110259383A - A kind of protrusive bores note integrated device and application method - Google Patents

Abstract

The invention discloses a forward-type drilling and injection integrated device and a use method thereof, comprising a drill rod, one end of the drill rod is connected with a drill bit, and the other end of the drill rod is connected with a drilling rig; an inner tube is arranged inside the drill rod, and the inner tube is used for drilling When drilling fluid or grouting is injected, the inner pipe extends to the outside of the drill pipe and communicates with a plurality of outer pipes; Grouting water bag, the inflatable grouting water bag is connected with the water injection pipe; when drilling, the water flows out of the inflatable grouting water bag through the water injection pipe so that the inflatable grouting water bag is close to the outer wall of the drill pipe joint; when grouting, the water flow Through the water injection pipe, it enters the inflatable grout-stopping water bag to seal the holes and stop grouting. The device can realize the integrated construction of advanced drilling and injection in water-rich and weak formations, which greatly saves the workload, and has the advantages of timely plugging, good sealing, simple structure, reusability, safety and reliability, and convenient operation.

Description

A forward-type integrated drilling and injection device and its application method

technical field

The disclosure relates to the field of grouting reinforcement and anti-seepage in underground engineering, in particular to a forward-type integrated drilling and injection device and a use method.

Background technique

In underground geotechnical engineering such as subways, tunnels, and foundation pits, water-rich and weak strata are often encountered. If not treated effectively, it will often lead to disasters such as landslides and water inrush. Grouting is an effective way to strengthen weak strata and block groundwater. method.

Compared with ordinary grouting, segmented grouting has the advantages of more uniform diffusion range and better grouting effect. Drill pipe retreat segmental grouting and forward segmental grouting are two commonly used segmental grouting methods at present. The drill pipe retreating grouting method is to use the drill pipe to form a hole at one time, and the drill pipe is directly used as the grouting pipe, and the drill pipe is retreated to realize segmental grouting, but this grouting method lacks effective isolation between different grouting sections Measures lead to limited controllability of grouting, and cannot guarantee that all the grout enters the target grouting section. Therefore, in order to solve the problem that different grouting sections are difficult to isolate, the progressive segmented grouting method is often used in actual grouting projects, that is, the grouting pipe is grouted after the first section of drilling, and the next grouting section is re-drilled. Then lower the grouting pipe to grout until the design depth is reached. However, the grouting reinforcement and water plugging in water-rich and weak formations should be fast and timely. The drill pipe retreat grouting method needs to drill to the design depth, which takes a long time and is easy to form a water guide channel, which will cause sudden water inrush disasters. The segmented grouting method requires drilling and then inserting the grouting pipe for grouting. Multiple operating procedures delay the grouting time and easily lead to safety accidents. Due to the weak ground, there is a problem that the grouting pipe is not easy to insert after drilling question.

Contents of the invention

The purpose of the present disclosure is to overcome the deficiencies of the above-mentioned prior art, and provide a forward-type drilling-injection integrated device and a method of use; the device can realize forward-type drilling-injection integrated construction in water-rich and weak formations, which greatly saves the workload, and It has the advantages of timely sealing, good sealing, simple structure, reusable, safe and reliable, and convenient operation.

The purpose of the first invention of the present disclosure is to propose a forward-type integrated drilling and injection device. To achieve the above-mentioned purpose, the present disclosure adopts the following technical solutions:

A forward drilling and injection integrated device, including a drill rod, one end of the drill rod is connected to the drill bit, and the other end of the drill rod is connected to the drilling rig;

An inner pipe is arranged inside the drill pipe, and the inner pipe is used to inject drilling fluid during drilling or inject grout during grouting, and the inner pipe extends to the outside of the drill pipe and communicates with a plurality of outer pipes;

The drill pipe includes multiple sections of drill pipe, one of which is provided with an inflatable anti-slurry water bag on the outside of one section of the drill pipe, and the inflatable anti-slurry water bag is connected with the water injection pipe; when drilling, the water flows out of the inflatable anti-slurry water through the water injection pipe. The water bladder makes the expandable grouting water bladder close to the outer wall of the drill pipe joint; when grouting, the water flow enters the expandable grout-stop water bladder through the water injection pipe to seal the hole and stop the grout.

As a further technical solution, the inflatable grout-stop water bag includes an elastic bag body, the end of the water injection pipe extends to the inside of the elastic bag body, and the water injection pipe and the elastic bag body are hermetically connected.

As a further technical solution, the elastic capsule is arranged in a groove on the outer side wall of the drill pipe joint.

As a further technical solution, the water injection pipe is arranged inside the drill pipe and is arranged close to the inner wall of the drill pipe.

As a further technical solution, a one-way valve is provided at the end of the inner tube that cooperates with the drill bit.

As a further technical solution, the drill pipe joints are fixedly connected through drill pipe joints.

As a further technical solution, the inner pipe, the water injection pipe and the outer pipe are all provided with valves.

The second invention objective of the present disclosure proposes a method for using an advanced drilling and injection integrated device, including the following steps:

Drilling grouting is carried out by advancing segmental grouting; after each segment of drilling, the drill pipe retreats a set distance, injects water into the expansion-type grouting water bag, and then injects grout into the borehole through the inner pipe, and the grouting is completed Finally, unload the water pressure of the inflatable grout-stop water bag.

The third invention objective of the present disclosure proposes a method for using an advanced drilling and injection integrated device, including the following steps:

Drilling is carried out at a set angle in the construction area, and the drilling fluid is delivered from the inner pipe to the hole during drilling;

Drilling is stopped, the drill pipe retreats a set distance, and water is injected into the expandable grout-stop water bag, so that the expandable grout-stop water bag expands and squeezes the drill hole;

Inject grout from the inner pipe into the hole, and press water from the inner pipe to the hole after the grouting is completed;

Remove the water pressure of the inflatable grout-stop water bag;

Repeat the above steps to carry out the drilling and grouting construction of the next grouting section until the set drilling and grouting depth is reached.

As a further technical solution, the water injection pressure of the inflatable grout-stop water bag is greater than the grouting pressure.

As a further technical solution, the pressurized water volume is equal to the drilling volume of the current grouting section.

The beneficial effects of the disclosure are:

In the device of the present disclosure, an inner pipe is provided throughout the length of the drill pipe, and the inner pipe injects drilling fluid into the hole during drilling, injects grout into the hole during grouting, and simultaneously presses water into the borehole through the inner pipe. , injecting the grouting hydraulic pressure into the formation, for the water-rich and weak formation, it can realize fast and timely reinforcement and water blocking, and effectively avoid problems such as hole collapse that may occur.

In the disclosed device, the inflatable anti-slurry water bag is arranged in the groove on the outer wall of the drill pipe, and when the drill pipe is drilled, the water pressure of the inflatable anti-slurry water bag is removed, and the water bag can be closely attached to the groove of the drill pipe , to prevent the water bag from being damaged during drilling; after drilling, inject water into the expansion-type grout-stop water bag to achieve hole-sealing and grout-stopping.

The device of the present disclosure can realize the integrated construction of progressive drilling and injection in water-rich and weak formations, which greatly saves the workload, and has the advantages of timely plugging, good sealing performance, simple structure, reusability, safety and reliability, and convenient operation.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute improper limitations to the present application.

Fig. 1 is a schematic diagram of the structure and use of the integrated drilling and injection device of the present disclosure;

Fig. 2 is a schematic diagram of a drill bit, a drill pipe, and an inflatable anti-slurry water bag of the present disclosure;

Fig. 3 is a schematic diagram of a drill pipe without a water bladder in the present disclosure;

Fig. 4 is a partial schematic view of the inflatable anti-slurry water bag of the present disclosure in an expanded state;

Fig. 5 is a partial schematic diagram of the expandable grout-stop water bag of the present disclosure clinging to the drill pipe after pressure release;

Fig. 6 is a partial schematic view of the grouting and water injection pipelines of the present disclosure;

Fig. 7 is a schematic diagram of the drill bit of the present disclosure.

In the figure, 1. Unreinforced formation; 2. Grouting section; 3. Drilling; 4. Inner pipe check valve; 5. Drill pipe section b; 6. Inner pipe; 7. Reinforced formation; Slurry water bag; 9. Drill pipe joint; 10. Drill pipe joint a; 11. Water injection pipe; 12. Water injection pipe valve; 13. Inner pipe valve; 14. Outer pipe valve b; 15. Outer pipe b; 16. 17. Outer pipe valve a; 18. Outer pipe a; 19. Outer pipe valve c; 20. Outer pipe c; 21. Drilling machine; 22 drill bit.

Detailed ways

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

For the convenience of description, if the words "up", "down", "left" and "right" appear in the present disclosure, they only indicate that they are consistent with the directions of up, down, left and right in the drawings themselves, and do not limit the structure. It is for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present disclosure.

In this disclosure, terms such as "fixed", "connected", and "connected" should be interpreted in a broad sense, which means that they can be fixedly connected, integrally connected or detachably connected; they can be connected directly or through an intermediate connection. The medium is indirectly connected. For relevant researchers or technicians in the field, the specific meanings of the above terms in the present disclosure can be determined according to specific situations, and should not be construed as limitations on the present disclosure.

As introduced in the background technology, grouting reinforcement and water plugging in water-rich and weak formations should be fast and timely. The retreating drill pipe grouting method needs to drill to the design depth, which takes a long time and is easy to form a water-conducting channel, which in turn causes In the case of sudden water inrush disasters, the advance segmental grouting method requires drilling and then inserting the grouting pipe for grouting. Multiple operating procedures delay the grouting time and easily lead to safety accidents. Due to the weak ground, there is a hole collapse after drilling The problem that the grouting pipe is not easy to insert. In order to solve the above technical problems, the present application proposes a forward-type integrated drilling and injection device.

The application provides a forward drilling and injection integrated device, including a drill rod, one end of the drill rod is connected to the drill bit, and the other end of the drill rod is connected to the drilling rig;

An inner pipe is arranged inside the drill pipe, and the inner pipe is used to inject drilling fluid during drilling or inject grout during grouting, and the inner pipe extends to the outside of the drill pipe and communicates with a plurality of outer pipes;

The drill pipe includes multiple sections of drill pipe joints, one of which is provided with an inflatable anti-slurry water bag on the outside, and the inflatable anti-slurry water bag communicates with the water injection pipe. When drilling, the water flows out of the expandable grouting water bag through the water injection pipe so that the inflatable grouting water bag is close to the outer wall of the drill pipe joint; when grouting, the water flows into the inflatable grouting water bag through the water injection pipe to seal the hole pulp.

Example 1

The integrated device disclosed in this embodiment will be further described below in conjunction with accompanying drawings 1 to 7;

Referring to the accompanying drawing 1, the advanced drilling and injection integrated device includes a drill bit 22, a drill pipe section b 5, a drill pipe section a 10, an inflatable grout-stopping water bag 8, a water injection pipe 11, an inner pipe 6, and an inner pipe valve 13 , Inner pipe check valve 4, outer pipe b 15, outer pipe a 18, outer pipe c 20, cross 16, outer pipe valve b 14, outer pipe valve a 17, outer pipe valve c 19.

One end of the drill rod of the device is connected with the drill bit 22, and the other end of the drill rod is connected with the drilling rig 21, and the drill rod 21 drives the drill rod to drill.

The inner pipe 6 is provided throughout the length of the drill pipe. The inner pipe 6 is used to inject drilling fluid during drilling and inject grout during grouting. The inner pipe 6 extends to the outside of the drill pipe and communicates with multiple outer pipes. Pipe valve 13.

As shown in FIG. 2 , the end of the inner pipe 6 extending to the drill bit is provided with an inner pipe check valve 4 for preventing drilling fluid and grouting slurry from flowing back into the inner pipe 6 of the drill pipe.

As shown in Figure 6, the inner pipe 6 is connected to three outer pipes through a cross 16, wherein the outer pipe a 18 is used to inject drilling fluid during drilling, the outer pipe b 15 is used to inject cement slurry during grouting, and the outer pipe C 20 is used for injecting water glass slurry during grouting.

An outer tube valve a 17 is set on the outer tube a 18 , an outer tube valve b 14 is set on the outer tube b 15 , and an outer tube valve c 19 is set on the outer tube c 20 .

As shown in Figures 1-3, the drill pipe of this device is composed of multiple drill pipe sections, including drill pipe section b5 and drill pipe section a10. The drill pipe sections are all tubular bodies, and the adjacent drill pipe sections pass through The drill pipe joint 9 is fixedly connected.

The outer wall of the middle part of the drill pipe section b 5 is provided with a groove, as shown in Fig. 4-5, the inflatable grout-stop water bag 8 is located in the groove, and the water in the inflatable grout-stop water bag 8 is drawn out during drilling. Make the expandable anti-grouting water bag close to the groove of the drill pipe to prevent damage during drilling; after drilling and before grouting, inject water into the inflatable anti-grouting water bag 8 to inflate the inflatable anti-grouting water bag 8 to seal Hole stopper.

The inflatable grout-stop water bag 8 includes an elastic bag body, the end of the water injection pipe 11 extends to the inside of the elastic bag body, and the water injection pipe 11 and the elastic bag body are hermetically connected. Here, the sealing connection between the water injection pipe and the elastic capsule body adopts the prior art, and will not be repeated here.

Expansive grout-stopping water bag 8 is made of expandable and shrinkable material, and is used for sealing holes and grout-stopping during grouting after drilling.

The water injection pipe 11 is located in the drill pipe section b5 and is connected with the expandable grout stop water bag 8, and the part connected with the expandable grout stop water bag 8 is close to the outer wall of the drill pipe section b5; the water injection pipe 11 extends to the outside of the drill pipe, And the water injection pipe 11 is provided with a water injection pipe valve 12 .

The water injection pipe 11 communicates with water supply devices such as water tanks. Open the water injection pipe valve 12 to inject water into the expandable grout stop water bag 8. The water of class device suction expansion type slurry water bag 8.

An ordinary drill pipe section a 10 without an inflatable slurry water bladder 8 is shown in Figure 3, and its two ends are provided with drill pipe joints 9 to connect with adjacent drill pipe sections, and a long inner pipe 6 is also provided inside it.

The distance between the inflatable grout-stop water bag 8 and the drill bit 22 can be adjusted, and the specific adjustment method is: adjusting by arranging different numbers of drill pipes a 10 between the drill bit 22 and the drill pipe section b 5 .

In this embodiment, as shown in FIG. 1 , the drilling-advancing grouting method is adopted, and the drilling and grouting construction is carried out in an alternate manner of drilling and injection. The design depth of borehole 3 is 30m, the designed grouting interval is 4-30m, and the grouting is divided into 4 sections. The length of the grouting section ² is 6m. The grouting material is cement single slurry. The designed grouting pressure is 2 MPa; the stratum that has been grouted is the reinforced stratum 7, the stratum that has not been grouted after drilling is the current grouting section 2, and the stratum that has not been drilled is the unreinforced stratum 1.

The specific implementation steps of the drilling and injection operation using the above-mentioned device are:

Step 1: Make the drill bit 22 that can be connected to the drill pipe according to the requirements, make the drill pipe section a 10 with the built-in inner pipe 6 and the water injection pipe 11, make the built-in inner pipe 6, the water injection pipe 11 and the external groove, and the expansion type slurry stopper In the drill pipe section b 5 of the capsule 8, the inner tube 6 is provided with an inner tube check valve 4 corresponding to the joint of the drill bit;

Step 2: According to geological conditions and drilling grouting requirements, select a suitable drilling rig 21, and connect it with the drill pipe, drill bit 22, etc. as a whole according to the structure shown in Figure 1;

Step 3: According to the design requirements, select the appropriate point and angle for drilling. Turn on the drilling machine 21, open the outer pipe valve a 17, so that the drilling fluid can enter, and carry out drilling. When the drilling depth is 10m, stop drilling, close the outer pipe valve a 17, and stop conveying the drilling fluid;

Step 4: The drill bit 22 retreats 3m, so that the drill bit 22 is located at a position of 7m, and the inflatable slurry-stopping water bag 8 is located at a position of 4m;

Step 5: Open the water injection pipe 11, inject water into the expandable grout-stop water bag 8, make the expandable grout-stop water bag 8 expand and squeeze the drill hole 3, the target water injection pressure should be greater than the grouting pressure, and close the grout after reaching the target water injection pressure. Water pipe valve 12;

Step 6: Open the outer pipe valve b 14 and the outer pipe valve c 19 to perform grouting, and stop grouting when the grouting pressure and grouting volume meet the design requirements;

Step 7: Close the outer pipe valve b 14 and the outer pipe valve c 19, open the outer pipe valve a 17, and press water. The amount of water pressure is equal to the volume of the hole in the grouting section. The purpose of water pressure is to press the double liquid slurry in the hole into the formation , to prevent the grout from solidifying and causing the drill to get stuck in the next stage of drilling;

Step 8: Open the valve 12 of the water injection pipe, remove the water pressure in the expandable grout-stop water bag 8, and make the expandable grout-stop water bag 8 close to the groove of drill pipe section b 5;

Step 9: Repeat steps 3 to 8 to carry out the drilling and grouting construction of the next grouting section until the predetermined drilling depth is reached.

In the above implementation cases, the water pressure in the inflatable grout-stop water bag 8 should be greater than the grouting pressure, so as to ensure that the inflatable grout-stop water bag can withstand the pressure generated by the grout during the grouting construction. During the grouting process, the outer pipe valve b14 and the outer pipe valve c19 can be adjusted according to the needs, and the grouting can be carried out with cement single-shot slurry or cement water glass double-shot slurry. After the grouting finishes, the cement water glass slurry in the borehole should be hydraulically injected into the formation by pressurized water, so as to prevent the double liquid slurry from solidifying and consolidating the drill bit 22 and the drilling rod quickly.

Although the specific implementation of the present disclosure has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present disclosure. Those skilled in the art should understand that on the basis of the technical solutions of the present disclosure, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present disclosure.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (10)

1. A forward type drilling and injection integrated device is characterized in that it includes a drill pipe, one end of the drill pipe is connected to the drill bit, and the other end of the drill pipe is connected to the drilling rig; An inner pipe is arranged inside the drill pipe, and the inner pipe is used to inject drilling fluid during drilling or inject grout during grouting, and the inner pipe extends to the outside of the drill pipe and communicates with a plurality of outer pipes; The drill pipe includes multiple sections of drill pipe, one of which is provided with an inflatable anti-slurry water bag on the outside of one section of the drill pipe, and the inflatable anti-slurry water bag is connected with the water injection pipe; when drilling, the water flows out of the inflatable anti-slurry water through the water injection pipe. The water bladder makes the expandable grouting water bladder close to the outer wall of the drill pipe joint; when grouting, the water flow enters the expandable grout-stop water bladder through the water injection pipe to seal the hole and stop the grout. 2. The advanced integrated drilling and injection device according to claim 1, wherein the inflatable grout-stopping water bag includes an elastic bag body, the end of the water injection pipe extends to the inside of the elastic bag body, and the water injection pipe and the elastic bag body Sealed connections between bodies. 3 . The advancing integrated drilling and injection device according to claim 2 , wherein the elastic capsule is arranged in a groove on the outer side wall of the drill pipe joint. 4 . 4. The advanced integrated drilling and injection device according to claim 1, wherein the water injection pipe is arranged inside the drill pipe and is arranged close to the inner wall of the drill pipe. 5 . The advanced integrated drilling and injection device according to claim 1 , wherein a one-way valve is provided at the end of the inner tube that cooperates with the drill bit. 5 . 6. The forward-type integrated drilling and injection device according to claim 1, wherein the drill pipe joints are fixedly connected by drill pipe joints; valves are set on the inner pipe, water injection pipe and outer pipe. 7. The method of using the advanced drilling and injection integrated device according to any one of claims 1-6, characterized in that it comprises the following steps: Drilling grouting is carried out by advancing segmental grouting; after each segment of drilling, the drill pipe retreats a set distance, injects water into the expansion-type grouting water bag, and then injects grout into the borehole through the inner pipe, and the grouting is completed Finally, unload the water pressure of the inflatable grout-stop water bag. 8. The method of using the advanced drilling and injection integrated device according to any one of claims 1-6, characterized in that it comprises the following steps: Drilling is carried out at a set angle in the construction area, and the drilling fluid is delivered from the inner pipe to the hole during drilling; Drilling is stopped, the drill pipe retreats a set distance, and water is injected into the expandable grout-stop water bag, so that the expandable grout-stop water bag expands and squeezes the drill hole; Inject grout from the inner pipe into the hole, and press water from the inner pipe to the hole after the grouting is completed; Remove the water pressure of the inflatable grout-stop water bag; Repeat the above steps to carry out the drilling and grouting construction of the next grouting section until the set drilling and grouting depth is reached. 9. The using method according to claim 8, characterized in that the water injection pressure of the inflatable grout-stop water bag is greater than the grouting pressure. 10. The use method according to claim 8, characterized in that the amount of pressurized water is equal to the borehole volume of the current grouting section.