Drill bit mechanism, pipe shed mounting device and construction method of pipe shed mounting device

Abstract

The invention relates to the technical field of tunnel pipe shed construction, in particular to a drill bit mechanism, a pipe shed installation device and a construction method thereof.The drill bit mechanism comprises a first drill bit and a second drill bit, the second drill bit is arranged outside the first drill bit in a sleeving mode, the first drill bit comprises a head and a tail, and the tail of the first drill bit is used for being connected with a drill rod; the head of the first drill bit is used for drilling, the second drill bit comprises a first connecting surface, the first connecting surface is in contact with the peripheral wall of the head of the first drill bit, the width of the first connecting surface is smaller than the length of the head of the first drill bit, and the second drill bit is provided with a mounting part which is used for being fixedly connected with a pipe shed steel pipe; the pipe shed mounting device comprises a rock drill and the drill bit mechanism, the rock drill is provided with a machine head, the machine head is connected with a drill rod, and one end of the drill rod extends into the first drill bit.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel pipe-roof construction, and in particular to a drill mechanism, a pipe-roof installation device and a construction method thereof. Background Art

[0002] With the development of social economy, it is necessary to build some hydropower and water conservancy projects on more rivers in high mountain valleys. In the construction of tunnel projects with poor surrounding rock sections, advanced support methods are generally used to prevent tunnel projects from becoming unstable due to the short self-stabilization time after excavation. Among the many advanced support methods, pipe shed support is widely used because it is relatively safe and reliable.

[0003] The pipe roof method is a commonly used auxiliary method for tunnel construction. The pipe roof and its advance grouting can not only effectively limit the surface subsidence, but also ensure that the working surface and the stratum are in a safe and stable state. The invention patent with patent number 2018108492159 discloses a multifunctional drilling rig and pipe roof installation device, which mainly includes: a power system, an operating platform, a walking system, a posture adjustment mechanism and a drilling system. The power system is located at the rear of the whole machine, the operating platform is located above the walking system, and the posture adjustment mechanism provides full rotation angle adjustment for the whole machine. The above-mentioned pipe roof installation device first uses a drill bit to drill a hole during operation, and then installs the pipe roof pipe. Specifically, when drilling a hole, the drill rod is connected to the drill bit. Under the action of the driving device, the power head drives the drill bit to drill a hole. After the drilling is completed, a special equipment is used to push the pipe roof pipe into the hole. When the above-mentioned drill bit is drilling a hole, if the rock is loose, the risk of collapse is very likely to occur. Once the hole collapses, the pipe roof cannot enter the hole, and it is necessary to drill again, which is time-consuming and laborious. Summary of the invention

[0004] In view of the deficiencies or problems existing in the prior art, the present invention provides a drill bit mechanism, a pipe shed installation device and a construction method thereof, which can effectively avoid hole collapse when inserting a pipe shed.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a drill bit mechanism, including a first drill bit and a second drill bit, the second drill bit is sleeved on the outside of the first drill bit, the first drill bit includes a head and a tail, the tail of the first drill bit is used to connect the drill rod, the head of the first drill bit is used to drill holes, and the second drill bit is provided with a mounting portion, and the mounting portion is used to be fixedly connected to the pipe rack steel pipe.

[0006] As a preferred embodiment, the first drill bit is provided with an annular protrusion, the head and tail of the first drill bit are respectively located on both sides of the annular protrusion, and the second drill bit is provided with a first annular structure, and the first annular structure and the head of the first drill bit are located on the same side of the annular protrusion. The outer diameter of the annular protrusion is greater than the inner diameter of the first annular structure. When the first drill bit is drilling a hole, the second drill bit enters the hole together with the pipe-roof steel pipe, and the first annular structure is located on one side of the annular protrusion. The annular protrusion acts as a limit to the first annular structure, so as to prevent the second drill bit from moving toward the tail of the first drill bit, i.e., out of the hole, due to the resistance when entering the hole, thereby preventing the pipe-roof steel pipe from entering the hole when drilling with the first drill bit.

[0007] As a preferred embodiment, the annular protrusion includes a first end face and a first annular surface, a second end face is provided on one side of the first annular structure close to the annular protrusion, the second end face is connected to the second annular surface, the first end face fits the second end face, and a first gap is provided between the first annular surface and the second annular surface. The first gap is provided so that the first annular surface does not contact the second drill bit, so as to reduce the friction caused by the contact between the two, and avoid the difficulty of exiting the hole caused by excessive friction between the first drill bit and the second drill bit when the first drill bit completes drilling and exits the hole, or the second drill bit is taken out of the hole together.

[0008] As a preferred embodiment, the annular protrusion further includes a first inclined surface, one end of the first inclined surface is connected to the tail of the first drill bit, and the other end is connected to the first annular surface. The setting of the first inclined surface enables the annular protrusion to have a buffering effect on the tail of the first drill bit, which can not only strengthen the structural strength of the tail of the first drill bit but also save a certain amount of materials.

[0009] As a preferred embodiment, the second drill bit includes a first connection surface, the first connection surface is the inner circumferential wall of the first annular structure, the head of the first drill bit includes a third annular surface and a second inclined surface, the third annular surface is located between the second inclined surface and the first end surface, a second gap is provided between the third annular surface and the first connection surface, the width of the third annular surface is smaller than the width of the first connection surface, the width of the first connection surface is smaller than the sum of the widths of the third annular surface and the second inclined surface, and the second inclined surface contacts the first connection surface. The second gap is provided to reduce the friction between the first drill bit and the second drill bit.

[0010] As a preferred embodiment, the angle between the third annular surface and the first end surface is ninety degrees, the angle between the second end surface and the first connecting surface is ninety degrees; the angle between the second end surface and the second annular surface is ninety degrees, and the angle between the first end surface and the first annular surface is ninety degrees.

[0011] As a preferred embodiment, the head of the first drill bit also includes a third bevel, the first end of the second bevel is connected to the third annular surface, and the second end of the second bevel is connected to the third bevel, the angle between the third bevel and the second bevel is an obtuse angle or a right angle, and the diameter of the head of the first drill bit gradually increases from the first end to the second end of the second bevel.

[0012] As a preferred embodiment, the head of the first drill bit further includes a third end face, the first end of the third bevel is connected to the second bevel, the second end of the third bevel is connected to the third end face, and the angle between the third bevel and the third end face is an obtuse angle. The arrangement of the third bevel makes the head of the first drill bit tend to a wedge-shaped structure, which is more conducive to drilling.

[0013] As a preferred embodiment, the second drill bit is provided with a fourth bevel, which is provided outside the first annular structure. The fourth bevel makes the end of the second drill bit tend to a wedge-shaped structure, thereby facilitating the second drill bit to enter the hole.

[0014] As a preferred embodiment, the second drill bit is further provided with a fourth end face, the fourth end face is connected to the fourth inclined face and the first connecting face respectively, and the angle between the fourth end face and the first connecting face is a right angle, and the angle between the fourth end face and the fourth inclined face is an obtuse angle. Such an angle setting facilitates the second drill bit to follow the first drill bit into the hole.

[0015] As a preferred embodiment, the mounting portion is arranged at an end away from the fourth end face, and the mounting portion includes a first mounting surface and a second mounting surface, and the first mounting surface and the second mounting surface are respectively welded to the pipe-roof steel pipe.

[0016] Another object of the present disclosure is to provide a pipe roof installation device, comprising a rock drill and the drill bit mechanism described above, wherein the rock drill is provided with a machine head, the machine head is connected to a drill rod, and one end of the drill rod extends into the interior of a first drill bit.

[0017] Compared with the existing products, since the second drill bit is sleeved on the outside of the first drill bit and the width of the first connecting surface is smaller than the length of the head of the first drill bit, after the first drill bit and the second drill bit are connected, the head end of the first drill bit extends outwardly beyond the second drill bit by a certain distance, so that the first drill bit can drill a hole; since the second drill bit is provided with a mounting portion, the mounting portion is used to be fixedly connected to the pipe-roof steel pipe, during the drilling process of the first drill bit, the second drill bit and the pipe-roof steel pipe go deeper into the hole together with the first drill bit, which is equivalent to that the drilling of the first drill bit and the insertion of the pipe-roof steel pipe are almost carried out at the same time. After the drilling of the first drill bit is completed, the first drill bit is withdrawn from the hole together with the drill rod, and the second drill bit and the pipe-roof steel pipe remain in the hole to support the rock wall. This can not only effectively avoid the problem of hole collapse, but also save time and improve work efficiency.

[0018] Another object of the present disclosure is to provide a construction method of a pipe-roof installation device, including welding of a pipe-roof steel pipe and a second drill bit, connection of the second drill bit with the first drill bit, and connection of the first drill bit with a drill rod;

[0019] Welding the pipe-roof steel pipe and the second drill bit: welding the end face of the pipe-roof steel pipe to the first mounting surface, and welding the side edge of the pipe-roof steel pipe to the second mounting surface;

[0020] The connection between the second drill bit and the first drill bit: after the pipe-roof steel pipe and the second drill bit are welded together, the second drill bit is sleeved on the head of the first drill bit;

[0021] Connection between the first drill bit and the drill rod: insert the drill rod into the tail portion of the first drill bit.

[0022] It should be noted that the first drill bit can be connected to the drill rod first, and then the second drill bit can be connected to the first drill bit, or the second drill bit can be connected to the first drill bit first, and then the first drill bit can be connected to the drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present application will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present application. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0024] Figure 1 This is one of the structural schematic diagrams of a drill mechanism disclosed in the present invention;

[0025] Figure 2 This disclosure Figure 1 A partial enlarged view of the middle A;

[0026] Figure 3 It is one of the structural schematic diagrams of the first drill bit disclosed in the present invention;

[0027] Figure 4 This is the second structural schematic diagram of the first drill bit disclosed in the present invention;

[0028] Figure 5 This is the second structural schematic diagram of a drill mechanism disclosed in the present invention;

[0029] Figure 6 It is a structural schematic diagram of a pipe-roof installation device disclosed in the present invention;

[0030] Figure 7 This disclosure Figure 6 A partial enlarged view of point B in the middle.

[0031] Description of reference numerals:

[0032] 1. First drill bit; 11. Head; 111. Third annular surface; 112. Second inclined surface; 113. Third inclined surface; 114. Third end surface; 12. Tail; 13. Annular protrusion; 131. First end surface; 132. First annular surface; 133. First inclined surface; 2. Second drill bit; 21. Mounting portion; 211. First mounting surface; 212. Second mounting surface; 22. First annular structure; 221. First connecting surface; 222. Fourth inclined surface; 223. Fourth end surface; 224. Second end surface; 225. Second annular surface; 3. First gap; 4. Second gap; 5. Rock drill; 6. Drill rod; 7. Pipe rack steel pipe. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is described in detail, clearly and completely 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 disclosure and are not used to limit the present disclosure.

[0034] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0035] Please see Figure 1-Figure 3As shown, the present application provides a drill bit mechanism, including a first drill bit 1 and a second drill bit 2 made of metal, the second drill bit 2 is sleeved on the outside of the first drill bit 1, the first drill bit 1 includes an integrally formed head 11 and a tail 12, the tail 12 of the first drill bit 1 is used to connect the drill rod 6, the head 11 of the first drill bit 1 is used to drill holes, the second drill bit 2 includes a first connecting surface 221, the first connecting surface 221 is in contact with the outer peripheral wall of the head 11 of the first drill bit 1, the width of the first connecting surface 221 is smaller than the length of the head 11 of the first drill bit 1, and the second drill bit 2 is provided with a mounting portion 21, and the mounting portion 21 is used to be fixedly connected to the pipe rack steel pipe 7. Since the second drill bit 2 is sleeved on the outside of the first drill bit 1, and the width of the first connection surface 221 is less than the length of the head 11 of the first drill bit 1, after the first drill bit 1 and the second drill bit 2 are connected, the head 11 end of the first drill bit 1 extends outwardly beyond the second drill bit 2 for a distance, so that the first drill bit 1 can drill holes; since the second drill bit 2 is provided with a mounting portion 21, the mounting portion 21 is used to be fixedly connected with the pipe-roof steel pipe 7, during the drilling process of the first drill bit 1, the second drill bit 2 and the pipe-roof steel pipe 7 go deep into the hole together with the first drill bit 1, which is equivalent to the drilling of the first drill bit 1 and the insertion of the pipe-roof steel pipe 7 being carried out almost simultaneously. After the drilling of the first drill bit 1 is completed, the first drill bit 1 is withdrawn from the hole together with the drill rod 6, and the second drill bit 2 and the pipe-roof steel pipe 7 are left in the hole to support the rock wall, which can effectively avoid the problem of hole collapse, save time and improve work efficiency. If a deeper pipe-roof is required, the next pipe-roof steel pipe 7 can be welded to the rear end of the first pipe-roof steel pipe 7.

[0036] Furthermore, an annular protrusion 13 is provided on the first drill bit 1, and the head 11 and the tail 12 of the first drill bit 1 are respectively located on both sides of the annular protrusion, and the second drill bit 2 is provided with a first annular structure 22, and the first annular structure 22 is located on one side of the annular protrusion 13. The first connecting surface 221 is the inner peripheral wall of the first annular structure 22, and the outer diameter of the annular protrusion 13 is greater than the inner diameter of the first annular structure 22. When the first drill bit 1 is drilling a hole, the second drill bit 2 enters the hole together with the pipe-roof steel pipe 7, and the first annular structure 22 is located on one side of the annular protrusion 13. The annular protrusion acts as a limit to the first annular structure 22, so as to prevent the second drill bit 2 from moving toward the direction of the tail 12 of the first drill bit 1, i.e., out of the hole, due to the resistance when entering the hole, thereby preventing the pipe-roof steel pipe 7 from entering the hole when the first drill bit 1 is drilling a hole.

[0037] For details, please refer to Figure 4 and Figure 5As shown, the annular protrusion 13 includes a first end face 131 and a first annular surface 132, a second end face 224 is provided on one side of the first annular structure 22 close to the annular protrusion 13, the second end face 224 is connected to the second annular surface 225, the first end face 131 is fitted with the second end face 224, and a first gap 3 is provided between the first annular surface 132 and the second annular surface 225. The first gap 3 is provided so that the first annular surface 132 does not contact the second drill bit 2, so as to reduce the friction caused by the contact between the two, and avoid the difficulty of withdrawing from the hole caused by excessive friction between the first drill bit 1 and the second drill bit 2 when the first drill bit 1 is completed and withdraws from the hole, or the second drill bit 2 is taken out of the hole together. During the drilling process, the first drill bit 1 carries the second drill bit 2 deeper into the hole. Since the second drill bit 2 is sleeved on the outside of the first drill bit 1, the second drill bit 2 is subject to greater resistance. Under the action of the resistance, the second drill bit 2 will move out of the hole or have a tendency to move out of the hole. The setting of the annular protrusion 13 makes the first end face 131 fit with the second end face 224 during drilling, and the greater the resistance encountered by the second drill bit 2, the tighter the fit between the first end face 131 and the second end face 224. Since the first drill bit 1 keeps moving into the hole during drilling, the second drill bit 2 will also go deeper into the hole against the resistance under the action of the annular protrusion 13.

[0038] It should be noted that the annular protrusion 13 also includes a first inclined surface 133, one end of the first inclined surface 133 is connected to the tail portion 12 of the first drill bit 1, and the other end is connected to the first annular surface 132. The setting of the first inclined surface 133 enables the annular protrusion 13 to have a buffering effect on the tail portion 12 of the first drill bit 1, which can not only strengthen the structural strength of the tail portion 12 of the first drill bit 1 but also save a certain amount of materials.

[0039] Please continue to see Figure 2 and Figure 4As shown, in one embodiment of the present disclosure, the head 11 of the first drill bit 1 includes a third annular surface 111 and a second inclined surface 112, the third annular surface 111 is located between the second inclined surface 112 and the first end surface 131, a second gap 4 is provided between the third annular surface 111 and the first connecting surface 221, and the second inclined surface 112 is in contact with the first connecting surface 221. The second gap 4 is provided to reduce the friction between the first drill bit 1 and the second drill bit 2. The second inclined surface 112 is provided so that the head 11 of the first drill bit 1 located therein is roughly horn-shaped. The second inclined surface 112 is in contact with the first connecting surface 221, so that during the rotation of the first drill bit 1, the second drill bit 2 can be driven to rotate by the action of friction, so that the second drill bit 2 and the first drill bit 1 rotate together to drill a hole. In addition, the second bevel 112 is arranged near the end of the head 11 of the first drill bit 1, and the position where the second drill bit 2 contacts the first drill bit 1 is located at the end of the first connecting surface 221, which makes the position where the second drill bit 2 contacts the first drill bit 1 close to the end of the first drill bit 1 and the end of the second drill bit 2, respectively. When the drilling is completed, the first drill bit 1 moves toward its tail 12 to exit the hole. Due to the setting of the first gap 3 and the second gap 4, the first drill bit 1 has almost no contact with the middle and rear sections of the second drill bit 2 during the process of exiting the hole, that is, no friction is generated, so as to facilitate the exit of the first drill bit 1 and will not interfere with the second drill bit 2 during the exit. Preferably, the width of the third annular surface 111 is smaller than the width of the first connecting surface 221, and the width of the first connecting surface 221 is smaller than the sum of the widths of the third annular surface 111 and the second bevel 112.

[0040] The angle between the third annular surface 111 and the first end surface 131 is 90 degrees, the angle between the second end surface 224 and the first connecting surface 221 is 90 degrees, the angle between the second end surface 224 and the second annular surface 225 is 90 degrees, and the angle between the first end surface 131 and the first annular surface 132 is 90 degrees. Such a configuration allows the first end surface 131 and the second end surface 224 to fit tightly together, and the annular protrusion 13 can better limit the second drill bit 2, and the second drill bit 2 can penetrate into the hole more stably and reliably under the action of the annular protrusion 13.

[0041] Further, such as Figure 4 and Figure 5As shown, the head 11 of the first drill bit 1 also includes a third bevel 113, the first end of the second bevel 112 is connected to the third annular surface 111, and the second end of the second bevel 112 is connected to the third bevel 113, the angle between the third bevel 113 and the second bevel 112 is an obtuse angle or a right angle, and the diameter of the head 11 of the first drill bit 1 gradually increases from the first end to the second end of the second bevel 112. The head 11 of the first drill bit 1 also includes a third end face 114, the first end of the third bevel 113 is connected to the second bevel 112, the second end of the third bevel 113 is connected to the third end face 114, and the angle between the third bevel 113 and the third end face 114 is an obtuse angle. The angle setting of the third bevel 113 and the third end face 114 makes the head 11 of the first drill bit 1 tend to a wedge-shaped structure, which is more conducive to drilling. The second bevel 112 is an upwardly inclined bevel. On the one hand, such a setting makes the first connecting surface 221 contact with it, increasing the friction between the first drill bit 1 and the second drill bit 2, so that the first drill bit 1 drives the second drill bit 2 to rotate and drill the hole together under the action of the friction. At the same time, it is also necessary to avoid excessive friction between the first drill bit 1 and the second drill bit 2, which affects the first drill bit 1 to withdraw from the hole. Therefore, the first gap 3 and the second gap 4 are set to reduce the friction between the first drill bit 1 and the second drill bit 2, so as to avoid excessive friction between the two, which will interfere with the withdrawal of the first drill bit 1 after the drilling is completed. Since the second bevel 112 is an upwardly inclined bevel, in order to make the head 11 of the first drill bit 1 drill more smoothly, it is necessary to set a third bevel 113 inclined downward, so that the angle between the third bevel 113 and the second bevel 112 is an obtuse angle or a right angle. In addition, in order to ensure the structural strength of the first drill bit 1 and the size of the drilled hole, it is necessary to set a third end face 114.

[0042] Since the contact area between the first drill bit 1 and the second drill bit 2 is limited, in order to prevent insufficient friction between the first drill bit 1 and the second drill bit 2, resulting in the first drill bit 1 being unable to drive the second drill bit 2 to rotate and drill holes, a protrusion or a convex strip is set at the front end of the first connecting surface 221 to increase the friction.

[0043] like Figure 1 , Figure 2 and Figure 5As shown, the second drill bit 2 is provided with a fourth inclined surface 222, and the fourth inclined surface 222 is provided on the outside of the first annular structure 22. The setting of the fourth inclined surface 222 makes the end of the second drill bit 2 tend to a wedge-shaped structure, so as to facilitate the second drill bit 2 to enter the hole. It should be noted that the second drill bit 2 will rotate with the first drill bit 1 to drill a hole under the action of friction, and the end of the second drill bit 2 tends to a wedge-shaped structure, which is convenient for the second drill bit 2 to enter the hole on the one hand and convenient for the second drill bit 2 to drill a hole on the other hand. The second drill bit 2 is also provided with a fourth end face 223, and the fourth end face 223 is respectively connected to the fourth inclined surface 222 and the first connecting surface 221, and the angle between the fourth end face 223 and the first connecting surface 221 is a right angle, and such an angle setting facilitates the second drill bit 2 to enter the hole together with the first drill bit 1. The included angle between the fourth inclined surface 222 and the fourth end surface 223 is an obtuse angle, so that one end of the second drill bit 2 tends to be a wedge-shaped structure, which facilitates the second drill bit 2 to drill when drilling into the hole.

[0044] The mounting portion 21 is arranged at an end away from the fourth end face 223, and the mounting portion 21 includes a first mounting surface 211 and a second mounting surface 212, wherein the first mounting surface 211 is welded to the end face of the pipe-roof steel pipe 7, and the second mounting surface 212 is welded to the side face of the pipe-roof steel pipe 7. It should be noted that the width of the first mounting surface 211 is greater than or equal to the outer diameter of a single pipe-roof steel pipe 7, so that after the pipe-roof steel pipe 7 is mounted on the mounting portion 21, the lower edge of the pipe-roof steel pipe 7 is not lower than the lower end of the first mounting surface 211. If the lower edge of the pipe-roof steel pipe 7 is lower than the lower end of the first mounting surface 211, the annular protrusion 13 of the first drill bit 1 is likely to hit the pipe-roof steel pipe 7 when exiting the hole, affecting the reliability of the pipe-roof steel pipe 7 in the hole, or the first drill bit 1 is blocked by the pipe-roof steel pipe 7 and cannot exit the hole.

[0045] Please see Figure 6 and Figure 7 As shown, another embodiment of the present disclosure provides a pipe roof installation device, including a rock drill 5 and the drill bit mechanism in the above embodiment, the rock drill 5 is provided with a machine head, the machine head is connected to a drill rod 6, the tail portion 12 of the first drill bit 1 is a hollow structure, and one end of the drill rod 6 extends into the hollow structure.

[0046] Another embodiment of the present disclosure provides a construction method of a pipe-roof installation device, including welding of a pipe-roof steel pipe 7 and a second drill bit 2, connection of the second drill bit 2 and a first drill bit 1, and connection of the first drill bit 1 and a drill rod 6;

[0047] Welding of the pipe-roof steel pipe 7 and the second drill bit 2: welding the end face of the pipe-roof steel pipe 7 to the first mounting surface 211, and welding the side edge of the pipe-roof steel pipe 7 to the second mounting surface 212;

[0048] Connection between the second drill bit 2 and the first drill bit 1: After the pipe-roof steel pipe 7 and the second drill bit 2 are welded together, the second drill bit 2 is sleeved on the head 11 of the first drill bit 1;

[0049] Connection between the first drill bit 1 and the drill rod 6 : insert the drill rod 6 into the tail portion 12 of the first drill bit 1 .

[0050] It should be noted that the first drill bit 1 can be connected to the drill rod 6 first, and then the second drill bit 2 can be connected to the first drill bit 1 , or the second drill bit 2 can be connected to the first drill bit 1 first, and then the first drill bit 1 can be connected to the drill rod 6 .

[0051] The present application is described in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A drill mechanism, characterized in that: The invention comprises a first drill bit (1) and a second drill bit (2), wherein the second drill bit (2) is sleeved on the outside of the first drill bit (1), the first drill bit (1) comprises a head portion (11) and a tail portion (12), the tail portion (12) of the first drill bit (1) is used to connect a drill rod (6), the head portion (11) of the first drill bit (1) is used to drill a hole, and the second drill bit (2) is provided with a mounting portion (21), and the mounting portion (21) is used to be fixedly connected to a pipe-roof steel pipe (7).

2. The drill head mechanism according to claim 1, characterized in that: The first drill bit (1) is provided with an annular protrusion (13), the head (11) and the tail (12) of the first drill bit (1) are respectively located on both sides of the annular protrusion, and the second drill bit (2) is provided with a first annular structure (22), and the first annular structure (22) and the head (11) of the first drill bit (1) are located on the same side of the annular protrusion (13).

3. The drill head mechanism according to claim 2, characterized in that: The annular protrusion (13) comprises a first end face (131) and a first annular surface (132); a second end face (224) is provided on a side of the first annular structure (22) close to the annular protrusion (13); the second end face (224) is connected to a second annular surface (225); the first end face (131) is fitted with the second end face (224); and a first gap (3) is provided between the first annular surface (132) and the second annular surface (225).

4. The drill head mechanism according to claim 3, characterized in that: The annular protrusion (13) further comprises a first inclined surface (133), one end of the first inclined surface (133) is connected to the tail portion (12) of the first drill bit (1), and the other end is connected to the first annular surface (132).

5. The drill head mechanism according to claim 3, characterized in that: The second drill bit (2) comprises a first connecting surface (221), the first connecting surface (221) being the inner circumferential wall of the first annular structure (22); the head (11) of the first drill bit (1) comprises a third annular surface (111) and a second inclined surface (112); the third annular surface (111) is located between the second inclined surface (112) and the first end surface (131); a second gap (4) is provided between the third annular surface (111) and the first connecting surface (221); the width of the third annular surface (111) is smaller than the width of the first connecting surface (221); the width of the first connecting surface (221) is smaller than the sum of the widths of the third annular surface (111) and the second inclined surface (112); and the second inclined surface (112) is in contact with the first connecting surface (221).

6. The drill head mechanism according to claim 5, characterized in that: The included angle between the third annular surface (111) and the first end surface (131) is ninety degrees, and the included angle between the second end surface (224) and the first connecting surface (221) is ninety degrees; the included angle between the second end surface (224) and the second annular surface (225) is ninety degrees, and the included angle between the first end surface (131) and the first annular surface (132) is ninety degrees.

7. The drill head mechanism according to claim 5, characterized in that: The head (11) of the first drill bit (1) further comprises a third bevel (113), a first end of the second bevel (112) is connected to the third annular surface (111), and a second end of the second bevel (112) is connected to the third bevel (113), an angle between the third bevel (113) and the second bevel (112) is an obtuse angle or a right angle, and a diameter of the head (11) of the first drill bit (1) gradually increases from the first end of the second bevel (112) to the second end.

8. The drill head mechanism according to claim 5, characterized in that: The head (11) of the first drill bit (1) further comprises a third end surface (114), the first end of the third inclined surface (113) is connected to the second inclined surface (112), the second end of the third inclined surface (113) is connected to the third end surface (114), and the angle between the third inclined surface (113) and the third end surface (114) is an obtuse angle.

9. The drill head mechanism according to claim 5, characterized in that: The second drill bit (2) is provided with a fourth inclined surface (222), and the fourth inclined surface (222) is arranged outside the first annular structure (22).

10. The drill head mechanism according to claim 9, characterized in that: The second drill bit (2) is further provided with a fourth end face (223), the fourth end face (223) being connected to the fourth inclined face (222) and the first connecting face (221) respectively, and the angle between the fourth end face (223) and the first connecting face (221) is a right angle, and the angle between the fourth end face (223) and the fourth inclined face (222) is an obtuse angle.

11. A pipe rack installation device, characterized in that: It comprises a rock drill (5) and a drill bit mechanism according to any one of claims 1 to 10, wherein the rock drill (5) is provided with a machine head, the machine head is connected to a drill rod (6), and one end of the drill rod (6) extends into the interior of a first drill bit (1).

12. A construction method for a pipe-roof installation device, characterized in that: The pipe-roof installation device as claimed in claim 11 comprises welding of the pipe-roof steel pipe (7) and the second drill bit (2), connection of the second drill bit (2) and the first drill bit (1), and connection of the first drill bit (1) and the drill rod (6); Welding the pipe-roof steel pipe (7) and the second drill bit (2): welding the end face of the pipe-roof steel pipe (7) to the first mounting surface (211), and welding the side edge of the pipe-roof steel pipe (7) to the second mounting surface (212); The second drill bit (2) is connected to the first drill bit (1): after the pipe-roof steel pipe (7) and the second drill bit (2) are welded together, the second drill bit (2) is sleeved on the head (11) of the first drill bit (1); The first drill bit (1) is connected to the drill rod (6): the drill rod (6) is inserted into the interior of the tail portion (12) of the first drill bit (1).

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