Double-pipe grouting drill bit structure

Abstract

The invention relates to a tricone bit which comprises a tricone bit, a first outer sleeve, a third outer sleeve, a first inner pipe and a second inner pipe. The tricone bit is located at the tail end of the first outer sleeve, and a second outer sleeve is arranged between the first outer sleeve and the third outer sleeve. The second outer sleeve is detachably connected with the first outer sleeve and the third outer sleeve. The first inner pipe is located in a first inner hole of the first outer sleeve, the second inner pipe is located in a second inner hole of the second outer sleeve, and a center hole is formed in the second inner pipe. A mixing connecting pipe is arranged between the first inner pipe and the second inner pipe, and the mixing connecting pipe is provided with a material mixing cavity and a material conveying hole; and a central hole of the second inner pipe is sequentially communicated with the mixing cavity, the conveying hole, the second inner hole and the first inner hole. According to the double-pipe grouting drill bit structure, directional drilling can be carried out in a hard stratum, two kinds of slurry are conveyed to the position close to drilling through the double pipes on the premise that drilling removal is not needed, grouting is achieved after mixing, and the construction difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to a drill bit structure, and more particularly to a double-pipe grouting drill bit structure. Background Art

[0002] With the gradual densification of urban underground pipe networks and tunnel networks, the construction of underground pipelines and shield tunneling has caused the soil layer to loosen, which in turn has led to serious accidents such as the collapse and cracking of superstructures, tunnels, and road surfaces. In response to this situation, in the prior art, pressure grouting reinforcement is carried out in the loose area of the tunnel and the area where the pipe network is prone to collapse, filling the voids in the stratum, compressing the soil mass, improving the mechanical properties and bearing capacity of the soft soil layer. In the ground grouting in the existing scheme, most are vertical holes or inclined holes on the ground, with the defects of more borehole layout, greater influence by superstructures, and more operation blind spots; the existing horizontal grouting requires excavation of a foundation pit and pouring of an operation platform, and still uses straight-line drilling construction, making it difficult to avoid pipelines in the construction path; the existing underground shield advanced pipe shed grouting technology has limited construction space, and cross-operation is not conducive to the progress of the project. Therefore, there is an urgent need for a curve grouting technology to solve the current grouting reinforcement construction problems.

[0003] The current horizontal directional drill has the function of directional drilling, which can realize curve drilling and fixed-point drilling, and send the drill bit to the designated location; in the grouting process, the diameter of the pile formed by jet grouting is large and the pile diameter is good, but conventional jet grouting requires withdrawing the drill and replacing the jet grouting drill bit, wasting a lot of manpower and material resources.

[0004] The prior art, such as the Chinese patent application with the application number "202310819310.5" and the name "A Horizontal Directional Drill Curve Grouting Drill Bit", records the technical solution of the grouting drill bit, which can realize grouting without withdrawing the drill. However, this pressing plate form can only drill in soft strata and cannot be constructed in hard strata, and this solution cannot realize double-pipe grouting. Summary of the Invention

[0005] The object of the present invention is:

[0006] To design a double-pipe grouting drill bit structure that can perform directional drilling in hard strata, and without withdrawing the drill, two kinds of slurries are transported to the part close to the drilling through double pipes, and grouting is realized after mixing.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A double-pipe grouting bit structure includes a tricone bit, a first outer pipe, a third outer pipe, a first inner pipe, and a second inner pipe; the tricone bit is located at the end of the first outer pipe, and a second outer pipe is arranged between the first outer pipe and the third outer pipe; the second outer pipe is detachably connected to the first outer pipe and the third outer pipe respectively; the first inner pipe is located in the first inner hole of the first outer pipe, the second inner pipe is located in the second inner hole of the second outer pipe, and the second inner pipe is provided with a central hole; a mixing connection pipe is arranged between the first inner pipe and the second inner pipe, and the mixing connection pipe is provided with a mixing chamber and a material conveying hole; the central hole of the second inner pipe is sequentially communicated with the mixing chamber, the material conveying hole, the second inner hole, and the first inner hole.

[0009] Further, the inner diameter of the first outer pipe is larger than the outer diameter of the first inner hole to form an annular gap between the outer diameter of the first inner hole and the inner diameter of the first outer pipe.

[0010] Further, the central hole of the second inner pipe extends along the length direction of the second inner pipe; the second inner pipe is rotatably connected to the second outer pipe and the third outer pipe.

[0011] Further, the mixing connection pipe is located in the second inner hole of the second outer pipe, and the outer diameter of the mixing connection pipe is smaller than the inner diameter of the second inner hole to form an annular gap between the inner wall of the second inner hole and the outer diameter of the mixing connection pipe.

[0012] Further, the mixing chamber on the mixing connection pipe faces the central hole, and both ends of the material conveying hole are communicated with the mixing chamber and the second inner hole respectively; the end of the material conveying hole away from the mixing chamber is located on the outer circumferential wall of the mixing connection pipe.

[0013] Further, a first material conveying pipe and a second material conveying pipe are arranged in the central hole, and both the first material conveying pipe and the second material conveying pipe extend along the central hole and the ends of the first material conveying pipe and the second material conveying pipe face the mixing chamber.

[0014] Further, the mixing connection pipe is detachably and sealingly connected to the second inner pipe; the mixing connection pipe is detachably connected to the first inner pipe; the tricone bit is connected to one end of the first inner pipe away from the mixing connection pipe.

[0015] Further, one end of the third outer pipe away from the second outer pipe is connected to the power head on the drill rig of the drill rig.

[0016] Further, a probe bin is arranged on the second outer pipe, and a probe is arranged in the probe bin.

[0017] The beneficial effects of the present invention are:

[0018] A double-pipe grouting bit structure, through the comprehensive utilization of a tricone bit, a first outer pipe, a second outer pipe, a third outer pipe, a first inner pipe, a second inner pipe, a mixing connection pipe, a first material conveying pipe, and a second material conveying pipe, the tricone bit cooperates with the probe in the bit, can perform directional drilling in hard strata, realizes the conveying of two kinds of slurries through the first material conveying pipe and the second material conveying pipe, and without the need to withdraw the drill, makes the two kinds of slurries reach the position close to the drilling part. After being mixed by the mixing connection pipe, they are injected into a specific part of the formation from the drilling part close to the tricone bit, realizing directional grouting; simplifies the construction process and reduces the construction difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The cross-sectional schematic diagram of a double-pipe grouting bit structure of the present invention.

[0020] Figure 2 The cross-sectional schematic diagram of a partial structure of a double-pipe grouting bit structure of the present invention.

[0021] Figure 3 The connection schematic diagram between a double-pipe grouting bit structure of the present invention and a drilling rig.

[0022] In the figure:

[0023] 1, tricone bit; 2, first outer pipe; 21, first inner hole; 3, second outer pipe; 31, second inner hole; 4, third outer pipe; 5, first inner pipe; 6, second inner pipe; 61, central hole; 7, mixing connection pipe; 71, mixing cavity; 72, material conveying hole; 8, first material conveying pipe; 9, second material conveying pipe; 10, probe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Refer to Figures 1 to 3 , a double-pipe grouting bit structure, driven by a drilling rig, includes a tricone bit 1, a first outer pipe 2, a third outer pipe 4, a first inner pipe 5, and a second inner pipe 6; the tricone bit 1 is used for drilling in hard strata, and both the first outer pipe 2 and the third outer pipe 4 are cylindrical structures, and the third outer pipe 4 is connected to the drilling rig.

[0026] The tricone bit 1 is located at the end of the first outer pipe 2, and a second outer pipe 3 is arranged between the first outer pipe 2 and the third outer pipe 4; the second outer pipe 3 is a cylindrical structure; wherein, the central axes of the first outer pipe 2 and the second outer pipe 3 have an included angle, and the included angle is 0.5 - 3°.

[0027] The second outer sleeve 3 is detachably connected to the first outer sleeve 2 and the third outer sleeve 4 respectively; it can be detachably replaced.

[0028] The first inner tube 5 is located in the first inner hole 21 of the first outer sleeve 2, the second inner tube 6 is located in the second inner hole 31 of the second outer sleeve 3, and the second inner tube 6 is provided with a central hole 61; the central hole 61 extends along the length direction of the second inner tube 6 and is used for conveying the slurry.

[0029] A mixing connection tube 7 is arranged between the first inner tube 5 and the second inner tube 6. The mixing connection tube 7 is provided with a mixing chamber 71 and a material conveying hole 72; both ends of the mixing connection tube 7 are connected to the first inner tube 5 and the second inner tube 6, and the mixing connection tube 7 is used for connection and mixing of materials.

[0030] The mixing chamber 71 is used to realize the mixing of at least two kinds of slurries, and the material conveying hole 72 is used for conveying the mixed slurry.

[0031] The central hole 61 of the second inner tube 6 is successively communicated with the mixing chamber 71, the material conveying hole 72, the second inner hole 31 and the first inner hole 21, so as to realize that the slurry flows through the central hole 61, the mixing chamber 71, the material conveying hole 72, the second inner hole 31 and the first inner hole 21 in sequence, and finally is output from the position close to the tricone bit 1 to realize grouting.

[0032] The inner diameter of the first outer sleeve 2 is larger than the outer diameter of the first inner hole 21, so as to form an annular gap between the outer diameter of the first inner hole 21 and the inner diameter of the first outer sleeve 2, and this annular gap is used for the slurry to pass through.

[0033] The central hole 61 of the second inner tube 6 extends along the length direction of the second inner tube 6; the second inner tube 6 is rotationally connected to the second outer sleeve 3 and the third outer sleeve 4, and the second inner tube 6 is driven to rotate by the power head of the drill rig.

[0034] The mixing connection tube 7 is located in the second inner hole 31 of the second outer sleeve 3, and the outer diameter of the mixing connection tube 7 is smaller than the aperture of the second inner hole 31, so as to form an annular gap between the hole wall of the second inner hole 31 and the outer diameter of the mixing connection tube 7, and this annular gap is used for the slurry to pass through.

[0035] The mixing chamber 71 on the mixing connection tube 7 faces the central hole 61. Both ends of the material conveying hole 72 are respectively communicated with the mixing chamber 71 and the second inner hole 31. One end of the mixing chamber 71 far from the second inner tube 6 has a termination end; after the slurry is mixed in the mixing chamber 71, it is blocked by the termination end and can only flow out from the material conveying hole 72.

[0036] One end of the material conveying hole 72 far from the mixing chamber 71 is located on the outer circumferential wall of the mixing connection tube 7, so as to convey the mixed slurry from inside the mixing chamber 71 to the second inner hole 31 outside the mixing connection tube 7.

[0037] The material feeding hole 72 is arranged obliquely with respect to the axis of the mixing connection pipe 7, and the material feeding holes 72 are arranged in a circumferential array with respect to the axis of the mixing connection pipe 7, ensuring the flow rate of the slurry transportation and preventing the solidification of the mixed slurry.

[0038] A first material feeding pipe 8 and a second material feeding pipe 9 are arranged in the central hole 61. Both the first material feeding pipe 8 and the second material feeding pipe 9 extend along the central hole 61 and the ends of the first material feeding pipe 8 and the second material feeding pipe 9 face the mixing chamber 71. The first material feeding pipe 8 is connected to the drilling rig and is used for transporting the first type of slurry; the second material feeding pipe 9 is connected to the drilling rig and is used for transporting the second type of slurry.

[0039] The mixing connection pipe 7 is detachably and sealingly connected to the second inner pipe 6 to prevent slurry leakage; the mixing connection pipe 7 is detachably connected to the first inner pipe 5, specifically by a pin connection; the tricone bit 1 is connected to one end of the first inner pipe 5 away from the mixing connection pipe 7, and the mixing connection pipe 7 plays the roles of mixing and transmission.

[0040] One end of the third outer sleeve 4 away from the second outer sleeve 3 is connected to the power head on the drill rig of the drilling rig, and the power head on the drill rig drives the third outer sleeve 4 to rotate.

[0041] A probe bin is arranged on the second outer sleeve 3, and a probe 10 is arranged in the probe bin. The probe 10 can sense the position, inclination angle, and rotation angle of the second outer sleeve 3 and can transmit the sensed data back to the drilling rig to ensure the accurate directional drilling of the drill bit.

[0042] The working principle of the present invention is as follows:

[0043] During the construction process, when fixed-point grouting is required, first, the drilling rig moves to a specific position, then the drill rig's drill frame flips until it is inclined and maintains the posture. Subsequently, the power head on the drill frame starts to drive the third outer sleeve 4 and the second inner pipe 5 to rotate.

[0044] The second inner pipe 5 rotates, driving the mixing connection pipe 7 and the first inner pipe 5 to rotate, and finally realizing the operation of the tricone bit 1 to drill in the hard formation.

[0045] The third outer sleeve 4 rotates, driving the second outer sleeve 3 to rotate, and finally driving the first outer sleeve 2 to rotate; since there is an included angle between the axes of the first outer sleeve 2 and the second outer sleeve 3, the rotation of the first outer sleeve 2 and the second outer sleeve 3 by a specific angle can realize the adjustment of the underground drilling direction.

[0046] During the drilling process of the drill bit, the probe 10 in the probe bin of the second outer sleeve 3 detects and transmits signals to make the directional drilling construction trajectory accurate.

[0047] When the tricone bit 1 drills to a specific position where grouting is required, the water pump on the drilling rig starts to deliver slurries into the first feed pipe 8 and the second feed pipe 9 respectively, and the slurries delivered in the first feed pipe 8 and the second feed pipe 9 are of different materials.

[0048] The slurries are delivered through the first feed pipe 8 and the second feed pipe 9. When they are output from the ends of the first feed pipe 8 and the second feed pipe 9, they reach the mixing chamber 71 of the mixing connection pipe 7. The two slurries are mixed here. After mixing, under the action of pressure, they pass through the feed holes 72 and reach the annular gap between the inner wall of the second inner hole 31 of the second outer pipe 3 and the outer wall of the first inner pipe 5. Subsequently, they reach the annular gap between the inner wall of the first inner hole 21 of the first outer pipe 2 and the outer wall of the first inner pipe 5, and finally flow from the position close to the tricone bit 1 to the specific position where grouting is required, achieving the effect of directional drilling and fixed-point grouting in the hard bottom layer without withdrawing the drill.

[0049] In the present invention, unless otherwise clearly defined and limited, terms such as "connected", "connected to", "fixed" and the like shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0050] The above embodiments are used to further illustrate the present invention, but do not limit the present invention to these specific embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be understood to be within the protection scope of the present invention.

Claims

1. A double-pipe grouting bit structure, characterized in that: It includes a tricone bit (1), a first outer casing (2), a third outer casing (4), a first inner pipe (5) and a second inner pipe (6); the tricone bit (1) is located at the end of the first outer casing (2), and a second outer casing (3) is arranged between the first outer casing (2) and the third outer casing (4); the second outer casing (3) is detachably connected to the first outer casing (2) and the third outer casing (4) respectively; the first inner pipe (5) is located in the first inner hole (21) of the first outer casing (2), the second inner pipe (6) is located in the second inner hole (31) of the second outer casing (3), and the second inner pipe (6) is provided with a central hole (61); a mixing connection pipe (7) is arranged between the first inner pipe (5) and the second inner pipe (6), and the mixing connection pipe (7) is provided with a mixing cavity (71) and a material conveying hole (72); the central hole (61) of the second inner pipe (6) is sequentially communicated with the mixing cavity (71), the material conveying hole (72), the second inner hole (31) and the first inner hole (21).

2. The structure of a double-pipe grouting bit according to claim 1, characterized in that: The inner diameter of the first outer casing (2) is larger than the outer diameter of the first inner hole (21) to form an annular gap between the outer diameter of the first inner hole (21) and the inner diameter of the first outer casing (2).

3. The structure of a double-pipe grouting bit according to claim 2, characterized in that: The central hole (61) of the second inner pipe (6) extends along the length direction of the second inner pipe (6); the second inner pipe (6) is rotatably connected to the second outer casing (3) and the third outer casing (4).

4. The structure of a double-tube grouting bit according to claim 3, wherein: The mixing connection pipe (7) is located in the second inner hole (31) of the second outer casing (3), and the outer diameter of the mixing connection pipe (7) is smaller than the aperture of the second inner hole (31) to form an annular gap between the hole wall of the second inner hole (31) and the outer diameter of the mixing connection pipe (7).

5. The structure of a double-pipe grouting bit according to claim 4, wherein: The mixing cavity (71) on the mixing connection pipe (7) faces the central hole (61), and both ends of the material conveying hole (72) communicate with the mixing cavity (71) and the second inner hole (31) respectively; the end of the material conveying hole (72) far from the mixing cavity (71) is located on the outer circumferential wall of the mixing connection pipe (7).

6. A double-pipe grouting bit structure according to any one of claims 1-5, characterized in that: A first material conveying pipe (8) and a second material conveying pipe (9) are arranged in the central hole (61), and both the first material conveying pipe (8) and the second material conveying pipe (9) extend along the central hole (61) and the ends of the first material conveying pipe (8) and the second material conveying pipe (9) face the mixing cavity (71).

7. A double-tube grouting bit structure according to claim 6, characterized in that: The mixing connection pipe (7) is detachably and hermetically connected to the second inner pipe (6); the mixing connection pipe (7) is detachably connected to the first inner pipe (5); the tricone bit (1) is connected to one end of the first inner pipe (5) far from the mixing connection pipe (7).

8. The structure of a double-tube grouting bit according to claim 7, characterized in that: One end of the third outer casing (4) far from the second outer casing (3) is connected to the power head on the drill rig of the drill frame.

9. A double-tube grouting bit structure according to claim 6, characterized in that: A probe bin is arranged on the second outer casing (3), and a probe (10) is arranged in the probe bin.

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