Curvature borehole port sealing device

Abstract

The application discloses a curvature drilling hole orifice sealing device, which comprises a curvature drilling rod, an orifice pipe, a first sealing part, a second sealing part and a limiting part. One end of the curvature drilling rod extends into the stratum through the orifice pipe. An annular gap is formed between the inner wall of the orifice pipe and the curvature drilling rod. The first sealing part is located in the annular gap and is adjacent to the stratum. The fixed end of the first sealing part is sealingly connected with the inner wall of the orifice pipe, and the free end of the first sealing part is sealingly connected with the curvature drilling rod. The limiting part is located in the annular gap. The fixed end of the limiting part is fixedly connected with the inner wall of the orifice pipe, and the free end of the limiting part is abuttingly connected with the curvature drilling rod. The second sealing part is arranged around the curvature drilling rod and is abuttingly connected with the orifice flange of the orifice pipe. The application can solve the problems of poor sealing effect of the curvature drilling rod and the straight orifice pipe in the straight hole of the tunnel pipe piece and low accuracy of the curvature drilling rod jacking direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of curvature drilling sealing, in particular to a curvature drilling hole sealing device. BACKGROUND

[0002] In municipal tunnel stratum reinforcement engineering, because of the limitation of space in the tunnel and the part to be reinforced, curvature drilling is often needed to meet the requirements of grouting, freezing and other reinforcement methods for construction hole arrangement. When the curvature drilling needs to pass through the tunnel segment and extend into the stratum, it is difficult to directly use a drilling machine to top the curvature drill rod into the tunnel segment due to the high hardness of the tunnel segment. Therefore, a straight hole is first opened on the tunnel segment, and then the curvature drill rod is passed through the straight hole on the tunnel segment and topped into the stratum by the drilling machine to complete the opening of the curvature drilling. The reason for opening a straight hole instead of a curvature hole on the tunnel segment is that: on the one hand, it is difficult and complicated to operate the core taking operation of the curvature hole, while it is easier to take out the core and the core taking efficiency is high when a straight hole is opened; on the other hand, it requires more construction cost to make the curvature hole completely compatible with the curvature drill rod. In addition, because the curvature hole opening pipe and the curvature drilling hole are difficult to completely match, a straight line type hole opening pipe is usually installed in the straight hole opened on the tunnel segment. Since the curvature drill rod needs to pass through the straight line type hole opening pipe during the entire topping process, it is necessary to control the diameter of the straight line type hole opening pipe within a relatively large range (larger than the diameter of the curvature drill rod) to ensure that the curvature drill rod can pass through the straight line type hole opening pipe smoothly. Therefore, there is a large space between the curvature drill rod and the straight line type hole opening pipe, which is easy to cause the curvature drill rod to deviate during the topping process, resulting in deviation of the curvature drill rod from the predetermined topping track. In addition, due to the large space between the curvature drill rod and the straight line type hole opening pipe, water and sand gushing or grouting slurry in the stratum is more likely to leak out through the gap between the straight line type hole opening pipe and the curvature drill rod, which will adversely affect the construction and even cause great construction risk in serious cases. In addition, since the track of the curvature drill rod is not a straight line, the conventional sealing method will be loosened during the topping process of the curvature drill rod, resulting in poor sealing effect. SUMMARY

[0003] Therefore, the technical problem to be solved by the present application is to provide a curvature drilling hole sealing device to solve the problems of poor sealing effect of the curvature drill rod and the straight line type hole opening pipe in the straight hole of the tunnel segment and low accuracy of the topping direction of the curvature drill rod when the curvature drilling is opened.

[0004] To solve the above technical problems, the present application provides the following technical scheme:

[0005] The curvature drilling hole mouth sealing device comprises a curvature drilling rod, a hole mouth pipe, a first sealing part, a second sealing part and a limiting part; one end of the curvature drilling rod extends into the stratum through the hole mouth pipe; an annular gap is formed between the inner wall of the hole mouth pipe and the curvature drilling rod, the first sealing part is located in the annular gap and adjacent to the stratum, the fixed end of the first sealing part is sealingly connected with the inner wall of the hole mouth pipe, and the free end of the first sealing part is sealingly matched with the curvature drilling rod; the limiting part is located in the annular gap, the fixed end of the limiting part is fixedly connected with the inner wall of the hole mouth pipe, and the free end of the limiting part is abuttingly connected with the curvature drilling rod; the second sealing part is arranged around the curvature drilling rod, and the second sealing part is abuttingly connected with the hole mouth flange of the hole mouth pipe.

[0006] The curvature drilling hole mouth sealing device, the limiting part comprises a limiting part body, a spring and a limiting head; the limiting part body has an axial cavity; the spring and the limiting head are located in the axial cavity, the spring is adjacent to the fixed end of the limiting part body, and the limiting head is adjacent to the free end of the limiting part body; one end of the spring is fixedly connected with the fixed end of the limiting part body, the other end of the spring is fixedly connected with one end of the limiting head, and the other end of the limiting head extends out of the free end of the limiting part body and is abuttingly connected with the curvature drilling rod; the limiting head can linearly reciprocate along the axial direction of the axial cavity under the driving of the spring; and the fixed end of the limiting part body is mounted on the inner wall of the hole mouth pipe.

[0007] The curvature drilling hole mouth sealing device, the limiting head comprises a limiting head connecting part and a limiting head limiting part; the limiting head connecting part and the limiting head limiting part are integrally formed; the limiting head connecting part is in a cylindrical structure, and the limiting head limiting part is in a semispherical structure; the limiting head connecting part is fixedly connected with the spring, and the limiting head limiting part is abuttingly connected with the curvature drilling rod.

[0008] The curvature drilling hole mouth sealing device, the second sealing part comprises a packing and a sealing flange; the packing is wound on the curvature drilling rod, and the sealing flange is sleeved on the curvature drilling rod; one end of the packing is abuttingly connected with the hole mouth flange, and the other end of the packing is abuttingly connected with the sealing flange; and the sealing flange is fixedly connected with the hole mouth flange through bolts.

[0009] The curvature drilling hole mouth sealing device, the first sealing part is a grease brush; the grease brush is located in the annular gap and adjacent to the stratum, the fixed end of the grease brush is sealingly connected with the inner wall of the hole mouth pipe, and the free end of the grease brush is sealingly matched with the curvature drilling rod.

[0010] Or: the first sealing part is a skeleton oil seal; the skeleton oil seal is located in the annular gap and adjacent to the formation, the outer ring of the skeleton oil seal is sealingly connected with the inner wall of the orifice pipe, and the inner ring of the skeleton oil seal is sealingly connected with the curvature drill rod.

[0011] The curvature drilling orifice sealing device has two or more limiting parts, and at least two of the limiting parts are distributed on both sides of the curvature drill rod in the circumferential direction of the orifice pipe.

[0012] The curvature drilling orifice sealing device has an even number of limiting parts, and every two limiting parts are arranged on both sides of the curvature drill rod in the circumferential direction of the orifice pipe, so that the relative position of the curvature drill rod and the orifice pipe can be better ensured.

[0013] The curvature drilling orifice sealing device has an even number of limiting parts, and every two limiting parts are arranged on both sides of the curvature drill rod in the circumferential direction of the orifice pipe, so that the relative position of the curvature drill rod and the orifice pipe can be better ensured.

[0014] The curvature drilling orifice sealing device has an even number of limiting parts, and every two limiting parts are arranged on both sides of the curvature drill rod in the circumferential direction of the orifice pipe, so that the relative position of the curvature drill rod and the orifice pipe can be better ensured.

[0015] The curvature drilling orifice sealing device has an even number of limiting parts, and every two limiting parts are arranged on both sides of the curvature drill rod in the circumferential direction of the orifice pipe, so that the relative position of the curvature drill rod and the orifice pipe can be better ensured.

[0016] The technical scheme of the curvature drilling orifice sealing device has the following beneficial technical effects:

[0017] 1、The curvature drilling orifice sealing device has the following beneficial technical effects:

[0018] 2. Since the gap between the straight orifice tube and the curved drill rod changes continuously as the curved drill rod is advanced, the limiting component in this invention can automatically adjust according to the changes in the gap between the curved drill rod and the straight orifice tube during the advancement process. This ensures that all parts of the curved drill rod and the straight orifice tube remain relatively fixed throughout the entire advancement process, thereby ensuring that the curved drill rod can advance in a predetermined direction and providing better sealing stability for the first and second sealing parts. Furthermore, the limiting head of the limiting component in this invention has a semi-circular structure, which allows it to form point contact with the curved drill rod during advancement, effectively reducing the sliding friction between the curved drill rod and the limiting head, and lowering the difficulty of advancing the curved drill rod.

[0019] 3. The first sealing part can effectively seal the annular gap formed between the curved drill rod and the straight borehole pipe, preventing mud from the formation from entering the annular gap during the jacking of the curved drill rod; even if mud enters the annular gap, the second sealing part can prevent mud from leaking out of the annular gap, further ensuring the sealing performance between the curved drill rod and the borehole pipe during the jacking of the curved drill rod. Attached Figure Description

[0020] Figure 1 A schematic diagram of the overall sealing device for the orifice of a curved borehole in an embodiment of the present invention;

[0021] Figure 2 In the embodiments of the present invention Figure 1 Enlarged view of the sealing device for the orifice of the curved borehole at point A in the middle;

[0022] Figure 3 A schematic diagram of the limiting component in an embodiment of the present invention.

[0023] The reference numerals in the figure are as follows: 1-Curvature drill pipe; 2-First sealing part; 3-Limiting component; 31-Limiting part body; 32-Spring; 33-Limiting head; 331-Limiting head connection part; 332-Limiting head limiting part; 34-Axial cavity; 4-Orifice pipe; 5-Bolt; 6-Second sealing part; 61-Packing; 62-Sealing flange; 7-Juggling equipment; 8-Annular gap; 9-Orifice flange; 10-Sealing flange; 11-Tunnel segment. Detailed Implementation

[0024] A schematic diagram of the curvature drilling orifice sealing device in this embodiment is shown below. Figure 1 and Figure 2As shown in the figure, the straight orifice pipe 4 passes through the tunnel segment 11; the curvature drilling orifice pipe sealing device comprises a curvature drilling rod 1, an orifice pipe 4, a first sealing part 2, a second sealing part 6 and a limiting part 3; one end of the curvature drilling rod 1 extends into the stratum through the orifice pipe 4; there is an annular gap 8 between the inner wall of the orifice pipe 4 and the curvature drilling rod; in this embodiment, the first sealing part 2 is a grease brush; the grease brush is located in the annular gap 8 and adjacent to the stratum, the fixed end of the grease brush is sealingly connected with the inner wall of the orifice pipe 4, and the free end of the grease brush is sealingly matched with the curvature drilling rod 1

in other embodiments, the first sealing part 2 can also be a skeleton oil seal; the skeleton oil seal is located in the annular gap 8 and adjacent to the stratum, the outer ring of the skeleton oil seal is sealingly connected with the inner wall of the orifice pipe 4, and the inner ring of the skeleton oil seal is sealingly matched with the curvature drilling rod 1

[0025] The limiting part 3 is located in the annular gap 8; as Figure 3 shown, the limiting part 3 comprises a limiting part body 31, a spring 32 and a limiting head 33; the limiting part body 31 has an axial cavity 34; the spring 32 and the limiting head 33 are both located in the axial cavity 34, the spring 32 is adjacent to the fixed end of the limiting part body 31, and the limiting head 33 is adjacent to the free end of the limiting part body 31; one end of the spring 32 is fixedly connected with the fixed end of the limiting part body 31, the other end of the spring 32 is fixedly connected with one end of the limiting head 33, and the other end of the limiting head 33 extends out of the free end of the limiting part body 31 and abuts against the curvature drilling rod 1; the limiting head 33 can make linear reciprocating motion along the axial direction of the axial cavity 34 under the driving of the spring 32; the fixed end of the limiting part body 31 is installed on the inner wall of the orifice pipe 4.

[0026] As Figure 3 shown, in this embodiment, the limiting head 33 comprises a limiting head connecting part 331 and a limiting head limiting part 332; the limiting head connecting part 331 and the limiting head limiting part 332 are integrally formed; the limiting head connecting part 331 is in cylindrical structure, and the limiting head limiting part 332 is in semispherical structure; the limiting head connecting part 331 is fixedly connected with the spring 32, and the limiting head limiting part 332 abuts against the curvature drilling rod 1.

[0027] As Figure 2As shown, the limiting components 3 are six in number; every two limiting components 3 are arranged on both sides of the curvature drill rod 1 along the circumference of the orifice pipe 4

i.e. 3 limiting components are installed on each side

In other embodiments, the limiting components 3 can also be odd in number, and the limiting components 3 are arranged equidistantly along the axial direction of the orifice pipe 4 and / or along the circumference of the orifice pipe 4

[0028] During construction, when a curvature borehole needs to be drilled through the tunnel segment 11, a straight hole is first drilled through the tunnel segment 11, and a linear orifice pipe 4 is installed; the limiting components 3 are installed on the inner wall of the linear orifice pipe 4, and then the curvature drill rod 1 is inserted into the orifice pipe 4, at which time an annular gap 8 is formed between the curvature drill rod 1 and the inner wall of the orifice pipe 4; a grease brush is installed in the annular gap adjacent to the orifice of the orifice pipe 4 in the stratum, forming a first seal; then the packing 61 is wound around the curvature drill rod 1, the sealing flange 62 is also sleeved on the curvature drill rod 1, and one end of the packing 61 is abutted against the orifice flange 9 and the other end is abutted against the sealing flange 62; finally, the sealing flange 62 and the orifice flange 9 are fixedly connected by the bolts 5.

[0029] Then the jacking equipment 7 is started to jack the curvature drill rod 1 into the stratum, and in the process of jacking the curvature drill rod 1 into the stratum, the annular gap between the curvature drill rod 1 and the orifice pipe 4 changes due to the curvature of the curvature drill rod 1 and the straightness of the orifice pipe 4, at which time the limiting head of the limiting component in the annular gap is always abutted against the curvature drill rod 1 under the action of the spring, thereby ensuring that the jacking direction of the curvature drill rod 1 does not deviate due to the annular gap being too large during jacking, and also ensuring that the first and second sealing parts have better sealing stability. In addition, the limiting head of the limiting component in the embodiment is a semicircular structure, which can form a point contact with the curvature drill rod during jacking of the curvature drill rod, effectively reducing the sliding friction between the curvature drill rod and the limiting head, and reducing the jacking difficulty of the curvature drill rod.

[0030] Obviously, the above embodiments are merely examples for the purpose of clear illustration, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can also be made by those of ordinary skill in the art. It is not necessary or possible to exhaust all the embodiments. The changes or variations thus extended are still within the protection scope of the claims of the present patent application.

Claims

1. A curvature borehole port sealing device, characterized by, The curvature drill rod (1), the orifice tube (4), the first sealing part (2), the second sealing part (6) and the limiting part (3); one end of the curvature drill rod (1) penetrates the orifice tube (4) and extends into the stratum; the inner wall of the orifice tube (4) and the curvature drill rod have an annular gap (8), the first sealing part (2) is located in the annular gap (8) and is adjacent to the stratum, the fixed end of the first sealing part (2) is sealingly connected with the inner wall of the orifice tube (4), and the free end of the first sealing part (2) is sealingly matched with the curvature drill rod (1); the limiting part (3) is located in the annular gap (8), the fixed end of the limiting part (3) is fixedly connected with the inner wall of the orifice tube (4), and the free end of the limiting part (3) is abutted against the curvature drill rod (1); the second sealing part (6) is arranged around the curvature drill rod (1), and the second sealing part (6) is abutted against the orifice flange (9) of the orifice tube (4); The limiting part (3) comprises a limiting part body (31), a spring (32) and a limiting head (33); the limiting part body (31) has an axial cavity (34); the spring (32) and the limiting head (33) are located in the axial cavity (34), the spring (32) is adjacent to the fixed end of the limiting part body (31), and the limiting head (33) is adjacent to the free end of the limiting part body (31); one end of the spring (32) is fixedly connected with the fixed end of the limiting part body (31), the other end of the spring (32) is fixedly connected with one end of the limiting head (33), and the other end of the limiting head (33) extends out of the free end of the limiting part body (31) and is abutted against the curvature drill rod (1); the limiting head (33) can make linear reciprocating motion along the axial direction of the axial cavity (34) under the driving of the spring (32); and the fixed end of the limiting part body (31) is mounted on the inner wall of the orifice tube (4); The limiting head (33) comprises a limiting head connecting part (331) and a limiting head limiting part (332); the limiting head connecting part (331) and the limiting head limiting part (332) are integrally formed; the limiting head connecting part (331) is in a cylindrical structure, and the limiting head limiting part (332) is in a semispherical structure; the limiting head connecting part (331) is fixedly connected with the spring (32), and the limiting head limiting part (332) is abutted against the curvature drill rod (1).

2. The curved bore orifice seal of claim 1, wherein, The second sealing part (6) comprises a packing (61) and a sealing flange (62); the packing (61) is wound on the curvature drill rod (1), and the sealing flange (62) is sleeved on the curvature drill rod (1); one end of the packing (61) is abutted against the orifice flange (9), and the other end is abutted against the sealing flange (62); and the sealing flange (62) and the orifice flange (9) are fixedly connected through bolts (5).

3. The curved bore orifice seal of claim 1, wherein, The first sealing part (2) is a grease brush; the grease brush is located in the annular gap (8) and adjacent to the formation, the fixed end of the grease brush is sealed to the inner wall of the orifice pipe (4), and the free end of the grease brush is sealed to the curvature drill rod (1). Alternatively: the first sealing part (2) is a skeleton oil seal; the skeleton oil seal is located in the annular gap (8) and adjacent to the formation, the outer ring of the skeleton oil seal is sealed to the inner wall of the orifice pipe (4), and the inner ring of the skeleton oil seal is sealed to the curvature drill rod (1).

4. The curved bore orifice seal of claim 1, wherein, The limiting component (3) has two or more, and at least two of the two or more limiting components (3) are distributed on both sides of the curvature drill rod (1) along the circumference of the orifice tube (4).

5. The curved bore orifice seal of claim 1, wherein, The limiting component (3) has an even number, and every two limiting components (3) are arranged on both sides of the curvature drill rod (1) along the circumference of the orifice tube (4).

6. The curved bore orifice seal of claim 5, wherein, Along the axial direction of the orifice tube (4), the limiting components (3) on both sides of the curvature drill rod (1) are either on the same straight line or on different straight lines.

7. The curved bore orifice seal of claim 1, wherein, The limiting component (3) has an odd number, and the odd number of the limiting components (3) are arranged at equal intervals along the axial direction of the orifice tube (4) and / or at equal intervals along the circumferential direction of the orifice tube (4).

8. The curved bore orifice seal of claim 1, wherein, The gap between the orifice pipe (4) and the formation is sealed with a grease brush.

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