CN210858590U - Double-pipe rotary spraying drill bit capable of preventing slurry return - Google Patents
Double-pipe rotary spraying drill bit capable of preventing slurry return Download PDFInfo
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- CN210858590U CN210858590U CN202020701289.0U CN202020701289U CN210858590U CN 210858590 U CN210858590 U CN 210858590U CN 202020701289 U CN202020701289 U CN 202020701289U CN 210858590 U CN210858590 U CN 210858590U
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Abstract
The utility model discloses a prevent double-barrelled rotary drill bit that flows back, include: the center of the double drill rod is provided with a central pipeline, and the position, which is positioned outside the central pipeline, in the double drill rod is provided with an air passage; the drill bit is sleeved and fixed on the outer side of the double drill rod, an accommodating space is reserved between the drill bit and the outer wall of the tail end of the double drill rod, a nozzle groove is formed in the position, opposite to the tail end of the double drill rod, of the drill bit, and the nozzle groove is communicated with the accommodating space; the check valve is embedded in the accommodating space, gaps are reserved between the check valve and the dual drill rod and between the check valve and the drill bit, and the check valve can move to block the air passage; the nozzle is fixedly arranged in the nozzle groove, the center and the side end of the nozzle are respectively provided with a slurry spraying port and an air jet port, the slurry spraying port is communicated with the central pipeline, and the air jet port is communicated with the air passage and the gap. The utility model provides a pair of prevent double-barrelled rotary jet drill bit of mud returning has effectively solved because the drilling rod slurry of not ventilating prolongs the problem that the air flue continues the reflux.
Description
Technical Field
The utility model relates to a drill bit, especially a prevent double-barrelled rotary spraying drill bit of mud returning.
Background
When treating the foundation such as silt, cohesive soil, silt, loess, sandy soil and the like, a high-pressure injection grouting method is generally adopted, wherein a grouting process is a double-pipe rotary injection method construction, a drilling machine is utilized to drill a double pipe to a preset position of a soil layer, then a high-pressure device is used to make slurry become high-pressure flow of about 20MPa, the high-pressure flow is injected from an inner nozzle, air is compressed at the pressure of about 0.7MPa and is injected from an outer configuration, the high-pressure slurry impacts and damages a soil body under the combined action of the high-pressure slurry and surrounding airflow of an outer ring of the high-pressure slurry, meanwhile, a drill rod rotates and lifts upwards gradually at a certain speed, the slurry and soil particles are mixed forcibly, and after the slurry is solidified, a solidified body is formed on. Need uninstallation drilling rod at drilling rod promotion in-process, because the drilling rod is not ventilated, downthehole thick liquid is pressed greatly, and grout exists along the air flue, up backflow, and the phenomenon of air flue can be blockked up to the thick liquid, and the air compressor machine is damaged in can flowing to the air compressor machine seriously even.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a prevent double-barrelled rotary spraying drill bit of mud returning effectively solves double-barrelled rotary spraying method work progress, because the problem that the thick liquid continues the reflux along the air flue is not ventilated to the drilling rod.
The technical scheme of the utility model is that: the utility model provides a prevent double-barrelled rotary spraying drill bit of mud returning, includes:
the center of the double drill rod is provided with a central pipeline, and an air passage is formed in the position, located on the outer side of the central pipeline, in the double drill rod;
the drill bit is sleeved and fixed on the double drill rod, an accommodating space is reserved between the drill bit and the outer wall of the tail end of the double drill rod, a nozzle groove is formed in the position, opposite to the tail end of the double drill rod, of the drill bit, and the nozzle groove is communicated with the accommodating space;
the check valve is embedded in the accommodating space, gaps are reserved between the check valve and the dual drill rod and between the check valve and the drill bit, and the check valve can move to block the air passage;
the nozzle is fixedly arranged in the nozzle groove, a guniting port and an air jet are respectively formed in the center and the side end of the nozzle, the guniting port is communicated with the central pipeline, and the air jet is communicated with the air passage and the gap.
Preferably, the air injection ports are arranged at an inclined angle.
Preferably, the inclination angle is 45 °.
Preferably, the caliber of the air jet is 1.5-3.5 mm.
Compared with the prior art, the utility model discloses following beneficial effect has: the utility model provides a pair of prevent double-barrelled drill bit that spouts soon of mud return adopts simple and novel structure, can effectively solve double-barrelled method work progress that spouts soon, because the problem that the thick liquid continues the reflux along the air flue is not ventilated to the drilling rod.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
As shown in figure 1, the double-pipe rotary spraying drill bit capable of preventing slurry return comprises a double drill rod 1, a drill bit 3, a check valve 4 and a nozzle 7.
A central pipeline 6 is arranged at the center of the dual drill rod 1, and an air passage 2 is arranged in the dual drill rod 1 and positioned outside the central pipeline 6.
This 3 covers of drill bit are established and are fixed on dual drilling rod 1, leave the accommodation space between 1 tail end outer wall of drill bit 3 and dual drilling rod, and the nozzle groove has still been seted up for 1 tail end position of dual drilling rod to drill bit 3, and the nozzle groove is linked together with the accommodation space.
This check valve 4 inlays and locates in the accommodation space, all leaves the gap with dual drilling rod 1, drill bit 3, and check valve 4 is movable to shutoff air flue 2.
The nozzle 7 is fixed in the nozzle groove, the center and the side end of the nozzle are respectively provided with a guniting port and an air jet 5, the guniting port is communicated with a central pipeline 6, the air jet 5 is communicated with an air passage 2 and a gap, and the caliber of the air jet is most suitable to be about 2 mm.
The air nozzle 5 is arranged at a certain inclination angle of 45 degrees.
The utility model discloses a theory of operation does: compressed air pushes away check valve 4 inside drill bit 3 along air flue 2 in dual drilling rod 1, from jet 5 blowout, the thick liquid is from the spouting mouth blowout on central line 6 nozzle 7 through the drill bit, when the change connects the drilling rod, the trachea stops to supply the thick liquid pipe to stop to send thick liquid, because the bore of jet 5 is very little, there is pressure in the drilling, at this moment thick liquid begins upwards palirrhea from air flue 2, but when flowing to check valve 4, promote check valve 4 upwards, check valve 4 closes the air flue, prevent that thick liquid from continuing the refluence along the air flue.
The double tube refers to the central tube 6 and the air duct 2.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the right of the present invention should not be limited thereby, and therefore, modifications, equivalent changes, improvements, etc. made in the claims of the present invention are still included in the scope of the present invention.
Claims (4)
1. The utility model provides a prevent double-barrelled rotary spraying drill bit of mud returning which characterized in that includes:
the center of the double drill rod is provided with a central pipeline, and an air passage is formed in the position, located on the outer side of the central pipeline, in the double drill rod;
the drill bit is sleeved and fixed on the double drill rod, an accommodating space is reserved between the drill bit and the outer wall of the tail end of the double drill rod, a nozzle groove is formed in the position, opposite to the tail end of the double drill rod, of the drill bit, and the nozzle groove is communicated with the accommodating space;
the check valve is embedded in the accommodating space, gaps are reserved between the check valve and the dual drill rod and between the check valve and the drill bit, and the check valve can move to block the air passage;
the nozzle is fixedly arranged in the nozzle groove, a guniting port and an air jet are respectively formed in the center and the side end of the nozzle, the guniting port is communicated with the central pipeline, and the air jet is communicated with the air passage and the gap.
2. The anti-mud-return double-pipe rotary jet drill bit according to claim 1, wherein the air nozzles are arranged at a certain inclination angle.
3. The anti-repulping double-tube rotary jet drill bit according to claim 2, wherein the inclination angle is 45 °.
4. The anti-repulping double-tube rotary jet drill bit according to claim 1, wherein the caliber of the air jet is 1.5-3.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020701289.0U CN210858590U (en) | 2020-04-30 | 2020-04-30 | Double-pipe rotary spraying drill bit capable of preventing slurry return |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020701289.0U CN210858590U (en) | 2020-04-30 | 2020-04-30 | Double-pipe rotary spraying drill bit capable of preventing slurry return |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210858590U true CN210858590U (en) | 2020-06-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020701289.0U Active CN210858590U (en) | 2020-04-30 | 2020-04-30 | Double-pipe rotary spraying drill bit capable of preventing slurry return |
Country Status (1)
| Country | Link |
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| CN (1) | CN210858590U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759362A (en) * | 2017-02-20 | 2017-05-31 | 北京中岩大地科技股份有限公司 | A kind of high-performance drill bit |
| CN111810079A (en) * | 2020-07-17 | 2020-10-23 | 北京光大锐拓工程技术有限公司 | Double-liquid rotary jet drilling tool and double-liquid rotary jet grouting reinforcement method |
-
2020
- 2020-04-30 CN CN202020701289.0U patent/CN210858590U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759362A (en) * | 2017-02-20 | 2017-05-31 | 北京中岩大地科技股份有限公司 | A kind of high-performance drill bit |
| CN111810079A (en) * | 2020-07-17 | 2020-10-23 | 北京光大锐拓工程技术有限公司 | Double-liquid rotary jet drilling tool and double-liquid rotary jet grouting reinforcement method |
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