Water stopping device in drill hole

Abstract

The invention belongs to the technical field of drilling water stopping, and particularly relates to a drilling internal water stopping device which comprises a wooden plug, annular notch grooves are formed in the outer walls of the upper end and the lower end of the wooden plug, water stopping belts adhere to the interiors of the two annular notch grooves, a feeding pipeline is fixedly installed at the center of the wooden plug, and a check valve is arranged in the middle of the feeding pipeline. Mounting grooves are formed in the upper end and the lower end of the wooden plug correspondingly, stainless steel limiting discs fixedly sleeve the outer sides of the upper end and the lower end of the feeding pipeline correspondingly, the two stainless steel limiting discs are located on the inner sides of the two mounting grooves correspondingly, and hard rubber adheres to and sleeves the outer sides of the two stainless steel limiting discs correspondingly; and the hard rubber abuts against the mounting groove for sealing. The device is simple in structure, is made of common materials which can be obtained nearby, is low in manufacturing cost, does not affect the in-hole structure during installation, has the advantage of being convenient to construct, and is good in water stopping effect.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling water stopping, and in particular relates to a drilling internal water stopping device. Background Art

[0002] In the process of geological research, it is necessary to drill holes on the ground. However, it is easy to encounter water coming out from the bottom of the borehole during geological drilling. In order to completely block the bottom water and then perform water-proof wall treatment on the upper goaf, it is necessary to use water stop plugs to stop water when there is no casing. However, the price of special water stop plugs is too high and if the connection between the drill pipe and the water stop plug is not firm, it is very easy to cause the water stop plug to fall into the hole and cause a secondary accident. If the traditional wooden plug blocking method is used, there are many gaps between the wooden plug and the hole wall. When the water pressure at the bottom is too high (more than 2MPa), the water pressure will penetrate the wooden plug and the hole wall, and the rupture will continue to increase, causing the secondary water stop measures on the upper part of the wooden plug to completely fail. Therefore, it is urgent to improve the existing internal water stop device of the borehole and provide an internal water stop device for the borehole. Summary of the invention

[0003] The purpose of the present invention is to provide a drilling internal water stopping device with reasonable design, simple structure, low cost and convenient construction to solve the problems existing in the prior art.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A device for stopping water inside a borehole comprises a wooden plug, wherein the outer walls of the upper and lower ends of the wooden plug are provided with annular grooves, and waterstop strips are bonded in the two annular grooves. A feeding pipe is fixedly installed at the center of the wooden plug, and a check valve is provided in the middle of the feeding pipe. The upper and lower ends of the wooden plug are provided with mounting grooves, and the outer sides of the upper and lower ends of the feeding pipe are fixedly sleeved with stainless steel limit plates, and the two stainless steel limit plates are respectively located on the inner sides of the two mounting grooves, and the outer sides of the two stainless steel limit plates are bonded with hard rubber, and the hard rubber contacts and seals the mounting grooves.

[0005] As a preferred embodiment, the material of the wooden plug is cylindrical dry willow wood, the diameter of which is adapted to the diameter of the geological borehole, and the overall length of the wooden plug is 140 cm.

[0006] As a preferred embodiment, the two annular grooves are 20 cm away from both ends of the cork, the depth of the annular grooves is 20 mm, and the width of the grooves is 40 mm.

[0007] As a preferred embodiment, the material of the waterstop is a strong soft rubber that swells when it comes into contact with water, and the two waterstops correspond to the two annular grooves respectively.

[0008] As a preferred embodiment, the feeding pipeline also includes two stainless steel pipes, the check valve is fixed between the two stainless steel pipes and the three are arranged in a vertical direction, the diameters of the two stainless steel pipes are both 20 mm, the check valve is made of pure copper, and the total length of the feeding pipeline is greater than the length of the cork.

[0009] As a preferred embodiment, the interior of the stainless steel pipe is filled with cotton wool and grain.

[0010] Compared with the prior art, the present invention has the following beneficial effects: In the scheme of the present invention: Stuff cotton wool, grain and other materials into the bottom drill rod and the feeding pipe, then put the drill rod on the stainless steel pipe above, send the wooden plug into the designated position in the borehole, then control the drilling rig to pressurize the materials in the drill rod and the feeding pipe into the borehole below the wooden plug. At this time, driven by the upward water pressure, the gap between the wooden plug and the borehole wall can be filled with materials, and the two waterstops can expand when exposed to water until they fit and seal with the hole wall. After the water is stopped, cement balls and red clay balls are filled into the borehole to seal the upper part of the wooden plug. Through multi-layer sealing, an efficient water-stopping effect can be achieved; The use of a check valve can avoid backflow of water and materials. Compared with the drilling water-stopping device in the prior art, the drilling water-stopping device has a simple structure and is made of common materials that can be obtained nearby. The device has a low cost and the installation of the device does not affect the structure inside the hole. It has the advantages of convenient construction and good water-stopping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. The following description is made with respect to the drawings: Figure 1 It is a schematic diagram of the three-dimensional front view structure of the present invention; Figure 2 It is a schematic diagram of the front cross-sectional structure of the present invention; Figure 3 This is a front view structural schematic diagram of the present invention in an installed state.

[0012] In the figure: 1. Wooden plug; 2. Annular groove; 3. Water stop; 4. Feed pipe; 41. Check valve; 42. Stainless steel pipe; 5. Installation groove; 6. Stainless steel limit plate; 7. Hard rubber. DETAILED DESCRIPTION

[0013] The embodiments described below are only some of the embodiments of the present invention and do not represent all the embodiments consistent with the present invention. Now, in conjunction with the accompanying drawings, the exemplary embodiments are described as follows: like Figure 1-3 As shown, the internal water-stopping device of the drilling hole of the present invention comprises a wooden plug 1, annular grooves 2 are provided on the outer walls of the upper and lower ends of the wooden plug 1, water-stopping strips 3 are bonded in the two annular grooves 2, a feeding pipe 4 is fixedly installed at the center of the wooden plug 1, a check valve 41 is provided in the middle of the feeding pipe 4, mounting grooves 5 are provided on the upper and lower ends of the wooden plug 1, stainless steel limit plates 6 are fixedly sleeved on the outer sides of the upper and lower ends of the feeding pipe 4, the two stainless steel limit plates 6 are respectively located on the inner sides of the two mounting grooves 5, and hard rubber 7 is bonded and sleeved on the outer sides of the two stainless steel limit plates 6, and the hard rubber 7 contacts and seals the mounting grooves 5.

[0014] On the basis of the above structure, the material of the wooden plug 1 is cylindrical dry willow wood, the diameter and length of which are adapted to the aperture of the geological borehole, and the overall length of the wooden plug 1 is 140 cm.

[0015] On the basis of the above structure, the two annular grooves 2 are 20 cm away from both ends of the cork 1, the groove depth of the annular groove 2 is 20 mm, and the groove width is 40 mm.

[0016] On the basis of the above structure, the material of the water stop strip 3 is a strong soft rubber that swells when it comes into contact with water, and the two water stop strips 3 correspond to the two annular grooves 2 respectively.

[0017] In this embodiment, the wooden plug 1 is sent into a designated position in the drilled hole, and the upper and lower water stop strips 3 can swell when exposed to water until they fit and seal against the hole wall, thereby enhancing the water stop effect.

[0018] On the basis of the above structure, the feeding pipeline 4 also includes two stainless steel pipes 42, the check valve 41 is fixed between the two stainless steel pipes 42 and the three are arranged in a vertical direction, the diameters of the two stainless steel pipes 42 are both 20 mm, the check valve 41 is made of pure copper, and the total length of the feeding pipeline 4 is greater than the length of the cork 1.

[0019] In this embodiment, the check valve 41 can be used to avoid the phenomenon of water backflow and material reflux.

[0020] On the basis of the above structure, the interior of the stainless steel pipe 42 is filled with cotton wool and grains.

[0021] In this embodiment, the provision of the feed pipe 4 facilitates driving materials such as cotton wool and grain into the drill hole below the cork 1. At this time, driven by the upward water pressure, the gap between the cork 1 and the wall of the drill hole can be filled with the material, thereby achieving the purpose of stable water stopping. In addition, the length of the feed pipe 4 is greater than the length of the cork 1. The upper end of the stainless steel pipe 42 extends out of the cork 1 to facilitate its docking with the drill rod, and the lower end of the stainless steel pipe 42 extends out of the cork 1 to facilitate driving the material in the feed pipe 4 into the drill hole, thereby avoiding blockage of the material and affecting normal implementation.

[0022] The working principle of the present invention is as follows: When in use, firstly, cotton wool, grain and other materials are stuffed into the drill rod at the bottom of the drilling rig and the inside of the feeding pipe 4, and then the drill rod is sleeved on the stainless steel pipe 42 above, so that the wooden plug 1 can be sent to the specified position in the borehole, and then the drilling rig is controlled to increase pressure to drive the materials in the drill rod and the feeding pipe 4 into the borehole below the wooden plug 1. At this time, driven by the upward water pressure, the gap between the wooden plug 1 and the borehole wall can be filled with materials to avoid the wooden plug 1 and the hole wall being broken due to the existence of the gap when the water pressure is high. In addition, the two water stop strips 3 can expand when exposed to water and fit the hole wall to seal. In addition, under the action of the check valve 41, backflow and material reflux can be avoided. After water stopping, cement balls and red clay balls can be filled into the borehole to seal the upper part of the wooden plug 1. Through multi-layer sealing, an efficient water stopping effect can be achieved. In summary, compared with the existing internal water-stopping device for drilling holes, the structure of this drilling water-stopping device is simpler, the operation is faster and more convenient, and the materials used in the device are all common materials that can be obtained nearby. The device has low cost and a wide range of applications. The installation of this device will not affect the internal structure of the borehole. It has the advantages of convenient construction and good water-stopping effect.

[0023] The above are only preferred specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent changes, modifications, substitutions and variations made by technicians in this technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A water-stopping device for drilling an internal hole, comprising a wooden plug (1), characterized in that: The upper and lower outer walls of the wooden plug (1) are provided with annular grooves (2), and water stoppers (3) are bonded inside the two annular grooves (2). A feeding pipe (4) is fixedly installed at the center of the wooden plug (1), and a check valve (41) is provided in the middle of the feeding pipe (4). The upper and lower outer walls of the wooden plug (1) are provided with mounting grooves (5), and the upper and lower outer walls of the feeding pipe (4) are fixedly sleeved with stainless steel limit plates (6). The two stainless steel limit plates (6) are respectively located on the inner sides of the two mounting grooves (5). The outer sides of the two stainless steel limit plates (6) are bonded with hard rubber (7), and the hard rubber (7) contacts and seals the mounting grooves (5).

2. A drilling internal water stopping device according to claim 1, characterized in that: The material of the wooden plug (1) is a cylindrical dry willow wood, and its diameter is adapted to the hole diameter of the geological drill hole.

3. A drilling internal water stopping device according to claim 1, characterized in that: The two annular grooves (2) are 20 cm away from both ends of the wooden plug (1), the groove depth of the annular groove (2) is 20 mm, and the groove width is 40 mm.

4. A drilling internal water stopping device according to claim 1, characterized in that: The material of the water stop strip (3) is a strong soft rubber that swells when in contact with water, and the two water stop strips (3) correspond to the two annular grooves (2) respectively.

5. The borehole internal water stopping device according to claim 1, characterized in that: The feeding pipeline (4) further comprises two stainless steel pipes (42), the non-return valve (41) is fixedly located between the two stainless steel pipes (42) and the three are arranged in a vertical direction, the diameter of the two stainless steel pipes (42) is 20 mm, the non-return valve (41) is made of pure copper, and the total length of the feeding pipeline (4) is greater than the length of the cork (1).

6. A drilling internal water stopping device according to claim 5, characterized in that: The interior of the stainless steel pipe (42) is filled with cotton wool and grain.

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