Orifice device for drilling and water plugging under strong permeable geological condition

Abstract

The utility model provides an orifice device for drilling and water plugging under the geological condition of strong water permeability, which belongs to the technical field of drilling assistance and comprises an orifice arranged on a tunnel face, a concrete annular part fixedly arranged on the inner side of the orifice, and an embedded steel pipe inserted in the orifice. By designing the orifice, the embedded steel pipe, the external steel pipe, the ball valve and other structures, the embedded steel pipe and the inner side of the orifice are sealed in an inflatable manner, and the support is installed to limit axial movement, so that quick plugging during gushing is achieved, the use effect is good, and safety and stability are achieved; if gushing does not occur, the pre-embedded steel pipe, the external steel pipe, the ball valve and other structures can be quickly disassembled after drilling is finished and put into secondary use.

Description

TECHNICAL FIELD

[0001] The utility model relates to borehole auxiliary technical field, concretely is a hole mouth device for borehole and water plugging under strong water permeable geological condition. BACKGROUND

[0002] In the process of underground engineering borehole construction under strong water permeable geological condition of rich underground water or near river, reservoir and other natural water area, once drilling penetrates strong water permeable layer or drilling passes through rock and natural water area water body direct intercommunication, under the action of water pressure, water flow flows into underground engineering construction operation surface along drilling, leads to construction unable to carry on normally, also brings huge drainage pressure to underground engineering, if not promptly plugging gushing borehole, gushing not only influences engineering progress and causes huge property loss, even can threaten construction personnel life.

[0003] Drilling gushing disposal usually inserts expansion water stopper etc into hole to carry out water stopping by manual or manual operation drilling machine, even directly leaves drill bit and drill rod in hole to control gushing for drilling gushing especially big, the above-mentioned water stopping method has poor operation condition, low construction efficiency, high safety risk, and there are many uncertainties in water stopping process, therefore, the utility model provides a hole mouth device for borehole and water stopping under strong water permeable geological condition. UTILITY MODEL CONTENT

[0004] In order to solve the problems of poor operation condition, low construction efficiency, high safety risk and many uncertainties in water stopping process of traditional drilling gushing disposal, the utility model provides a hole mouth device for borehole and water stopping under strong water permeable geological condition.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A hole mouth device for borehole and water stopping under strong water permeable geological condition, comprising:

[0007] The hole mouth is provided on the working face, and the inner side of the hole mouth is fixedly provided with a concrete annular part;

[0008] The pre-buried steel pipe is inserted into the inner side of the hole mouth, and the outer side of the pre-buried steel pipe is fixedly connected with a plurality of annularly arrayed supports, and the supports are fixedly installed with the working face;

[0009] The outer side of the pre-buried steel pipe and the inner side of the concrete annular part are fixedly installed with an annular expansion air bag;

[0010] The outer end flange of the pre-buried steel pipe is connected with an external steel pipe, the external steel pipe is fixedly installed with a ball valve, and the side surface of the external steel pipe is installed with a pressure detection assembly.

[0011] Further description of the above technical scheme:

[0012] The outer side of the concrete annular part is provided with an anchor rod and a staggered part embedded in the inner wall of the orifice.

[0013] As a further description of the above technical solution:

[0014] The concrete annular part is 30-50 cm away from the end of the orifice, and the inner side of the orifice and the outer side of the concrete annular part are provided with a grouting pipe and an exhaust pipe, which are symmetrically distributed on both sides of the embedded steel pipe.

[0015] As a further description of the above technical solution:

[0016] The pressure detection assembly comprises:

[0017] A branch pipe, one end of which is fixedly connected with the side surface of the external steel pipe, and the other end of which is fixedly installed with a pressure gauge;

[0018] A valve is fixedly installed on the branch pipe.

[0019] As a further description of the above technical solution:

[0020] The outer end flange of the external steel pipe is fixedly connected with a short pipe, the outer end flange of the short pipe is connected with a connecting pipe, and the side surface of the short pipe is fixedly installed with a flow meter.

[0021] As a further description of the above technical solution:

[0022] The difference between the inner diameter of the orifice and the outer diameter of the embedded steel pipe is 10-20 cm.

[0023] The beneficial effects of the utility model are as follows:

[0024] The utility model discloses a structure of orifice, embedded steel pipe, external steel pipe, ball valve, etc., the embedded steel pipe and the inner side of the orifice adopt the inflation type sealing, and the support installation restricts the axial movement, which satisfies the rapid plugging when the gushing occurs, and the use effect is good, safe and stable. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly show a kind of orifice device for drilling and water plugging under strong water permeable geological conditions, the following drawings are shown:

[0026] Figure 1 It is the structural schematic diagram of the utility model.

[0027] The reference signs in the drawings are as follows:

[0028] 1. Orifice; 2. Embedded steel pipe; 3. Concrete ring section; 4. Annular expansion airbag; 5. Grouting pipe; 6. Exhaust pipe; 7. External steel pipe; 8. Ball valve; 9. Branch pipe; 10. Valve; 11. Pressure gauge; 12. Short pipe; 13. Flow meter; 14. Connecting pipe; 15. Support. Detailed Implementation

[0029] Please refer to the attached document. Figure 1 This application illustrates an orifice device for drilling and water plugging under highly permeable geological conditions, provided by an embodiment of the present application. It is used in areas where, based on geological survey reports or advanced geological forecasts, water inrush is predicted during drilling to ensure safe construction. Specifically, it includes: an orifice 1 opened on the working face; a concrete annular portion 3 fixedly installed on the inner side of the orifice 1; a pre-embedded steel pipe 2 inserted into the orifice 1; and several ring-shaped supports 15 fixedly connected to the outer side of the pre-embedded steel pipe 2. The supports 15 are fixedly installed to the working face, and their stability is limited (preventing the pre-embedded steel pipe 2 from sliding up and down (corresponding to vertical holes) / left and right (corresponding to horizontal holes)). An annular expansion airbag 4 is fixedly installed on the outside of the pre-embedded steel pipe 2 and on the inside of the concrete annular part 3. When the annular expansion airbag 4 is inflated, its outer side can tightly squeeze the inner side of the concrete annular part 3, forming a stable sealing structure. This sealing structure prevents mud from spraying out from the gap between the orifice 1 and the pre-embedded steel pipe 2 during gushing. An external steel pipe 7 is connected to the outer flange of the pre-embedded steel pipe 2. A ball valve 8 is fixedly installed on the external steel pipe 7. A pressure detection component is installed on the side of the external steel pipe 7. The ball valve 8 is used to quickly close the external steel pipe 7 when gushing occurs, and the pressure of the internal gushing liquid can be detected by the pressure detection component so that the construction personnel can take further measures.

[0030] The specific construction steps are as follows:

[0031] (1) Analyze and predict the possibility of borehole water inrush based on geological survey reports or advanced geological forecasts;

[0032] (2) If the conclusion is that there is a high probability of water inrush in the borehole, a large-diameter drill bit is used to drill the borehole (the drilling depth should be 2 to 3 m) for the installation of the pre-embedded steel pipe 2.

[0033] (3) Insert the pre-embedded steel pipe 2 into the hole and fix the bracket 15 to the working face;

[0034] (4) Inflate the annular expansion airbag 4. The outer side of the annular expansion airbag 4 tightly squeezes the inner side of the concrete annular part 3 to form a stable sealing structure. Install the external steel pipe 7. The external steel pipe 7 is connected to the pre-embedded steel pipe 2 through flanges and bolts.

[0035] (5)Drilling rig installation normal drilling diameter drill bit, drilling through the ball valve and steel pipe drilling, when drilling process encountered gushing, stop drilling, immediately withdraw the drilling tool, close the ball valve, pressure detection component can detect the internal gushing liquid pressure;

[0036] (6)Gunning is completed, remove the external steel pipe 7.

[0037] It is worth noting that: the drilling diameter of the hole 1 > the outer diameter of the embedded steel pipe > the normal construction drilling diameter.

[0038] In an embodiment, the outer side of the concrete annular part 3 is provided with an anchor rod and a staggered part embedded in the inner wall of the hole 1, for increasing the stability of the connection between the concrete annular part 3 and the inner wall of the hole 1, especially the sealing between the concrete annular part 3 and the inner wall of the hole 1.

[0039] In an embodiment, the concrete annular part 3 is 30-50cm away from the end of the hole 1, so that the concrete annular part 3 and the end of the hole 1 can also be injected with mud plugging according to the water pressure after gushing occurs, forming a stable plugging structure.

[0040] The inner side of the hole 1 and the outer side of the concrete annular part 3 are provided with grouting pipes 5 and exhaust pipes 6, which are symmetrically distributed on both sides of the embedded steel pipe 2.

[0041] After gushing occurs, the ball valve 8 needs to be closed, and the pressure detection component detects the internal gushing liquid pressure. When the pressure is higher than the predetermined safety threshold, quick-drying sealing mud needs to be injected quickly from the grouting pipe 5, and the mud forms a secondary sealing structure.

[0042] In an embodiment, the pressure detection component includes a branch pipe 9, a valve 10, and a pressure gauge 11.

[0043] One end of the branch pipe 9 is fixedly connected to the side of the external steel pipe 7, the other end of the branch pipe 9 is fixedly installed with the pressure gauge 11, and the valve 10 is fixedly installed on the branch pipe 9.

[0044] When drilling, the pressure gauge 11 can not be installed, and the valve 10 can block the inside of the branch pipe 9. When gushing occurs, the pressure gauge 11 is installed, and the valve 10 is opened. This use mode can reduce the use of the pressure gauge 11, that is, if gushing does not occur during drilling, the pressure gauge 11 does not need to be used (when the pressure gauge 11 detects the mud pressure, it is easy to cause blockage and has a short service life).

[0045] In an embodiment, the outer end flange of the outer connecting steel pipe 7 is fixedly connected with a short pipe 12, the outer end flange of the short pipe 12 is connected with a connecting pipe 14, the side of the short pipe 12 is fixedly installed with a flow meter 13, when the pressure is reduced after the gushing, the ball valve 8 is opened, the flow meter 13 measures the flow of the liquid gushing, and subsequent processing is facilitated.

[0046] In an embodiment, the difference between the inner diameter of the hole 1 and the outer diameter of the embedded steel pipe 2 is 10-20 cm, meeting the installation requirements of the concrete annular part 3 and the annular expansion air bag 4.

[0047] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the claims and their equivalents. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0048] It should be understood that the terms such as "first" and "second" are used herein merely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. The present application is not limited to the precise construction and will be variously modified and changed in light of various embodiments described above and shown in the drawings. The scope of the present application is limited only by the claims appended hereto.

Claims

1. An orifice device for drilling and water plugging in strong water permeable geological conditions, comprising: The application discloses a hole (1) opened on a working face, characterized in that an inner side of the hole (1) is fixedly provided with a concrete annular part (3), and further comprising: a pre-buried steel pipe (2) inserted into the inner side of the hole (1), an outer side of the pre-buried steel pipe (2) being fixedly connected with a plurality of annularly-arrayed supports (15), the supports (15) being fixedly installed with the working face; an annular expansion air bag (4) fixedly installed on the outer side of the pre-buried steel pipe (2) and located on the inner side of the concrete annular part (3); an outer-connection steel pipe (7) flange-connected with the outer end of the pre-buried steel pipe (2), the outer-connection steel pipe (7) being fixedly installed with a ball valve (8), and a pressure detection assembly being installed on the side of the outer-connection steel pipe (7).

2. A mouthpiece for drilling and water plugging in strong water permeable geological conditions according to claim 1, characterized in that: An anchor rod and a staggered part are arranged on the outer side of the concrete annular part (3) and embedded into the inner wall of the hole (1).

3. The orifice device for drilling and water plugging in strong water permeable geological conditions according to claim 1, characterized in that: The concrete annular part (3) is located at a distance of 30-50 cm from the end of the hole (1), a grouting pipe (5) and an exhaust pipe (6) are arranged on the inner side of the hole (1) and located on the outer side of the concrete annular part (3), and the grouting pipe (5) and the exhaust pipe (6) are symmetrically arranged on the two sides of the pre-buried steel pipe (2).

4. The orifice device for drilling and water plugging in strong water permeable geological conditions according to claim 1, characterized in that, The pressure detection assembly comprises: a branch pipe (9) with one end fixedly connected with the side of the outer-connection steel pipe (7) and the other end fixedly installed with a pressure gauge (11); a valve (10) fixedly installed on the branch pipe (9).

5. The orifice device for drilling and water plugging in strong water permeable geological conditions according to claim 1, characterized in that: A short pipe (12) is fixedly connected with the outer end flange of the outer-connection steel pipe (7), a connecting pipe (14) is flange-connected with the outer end of the short pipe (12), and a flow meter (13) is fixedly installed on the side of the short pipe (12).

6. A port for drilling and water plugging in strong water permeable geological conditions according to claim 1, characterized in that: The difference between the inner diameter of the hole (1) and the outer diameter of the pre-buried steel pipe (2) is 10-20 cm.

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