Drill pipe and construction machinery

Abstract

The present invention relates to the technical field of engineering machinery, and provides a drill rod and engineering machinery, wherein the drill rod comprises: an outer rod, a core rod arranged inside the outer rod, and an intermediate rod arranged between the outer rod and the core rod, the intermediate rod and the core rod are telescopically arranged inside the outer rod in sequence, the top end of the intermediate rod is open, and at least a through first water flow hole is provided on the side wall of the intermediate rod. The drill rod and engineering machinery provided by the present invention are provided with an open top end of the intermediate rod, and the mud overflowing from the upper end can enter the inner cavity of the intermediate rod from the open top end of the intermediate rod, thereby increasing the discharge channel of the mud, which is conducive to the smooth discharge of the mud; the through first water flow hole is provided on at least the side wall of the intermediate rod, which is conducive to the mud in the inner cavity of the outer rod entering the inner cavity of the intermediate rod for discharge, thereby improving the slurry discharge capacity; and the overflowing mud can enter multiple inner cavity channels through the first water flow hole, which is conducive to accelerating the discharge of the mud and reducing the risk of mud overflowing from the upper end of the drill rod.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a drill rod and engineering machinery. Background Art

[0002] The application of engineering machinery such as rotary drilling rigs in pile hole construction is becoming more and more widespread. Taking rotary drilling rigs as an example, the common construction methods of rotary drilling rigs are mud wall construction and dry hole construction. In mud wall construction, it is necessary to inject mud to protect the wall when the drill rod is drilling downward. During the lifting and lowering process, it is necessary to pay attention to the moving speed of the drill rod. If it is lifted too fast, the water in the drill rod cannot be discharged from the bottom in time, and the mud will overflow from the top. Therefore, in actual work, the slurry discharge capacity of the drill rod plays a key role.

[0003] During the mud wall protection construction process, the existing drill pipe has the problem of poor slurry discharge and mud overflowing from the upper end; it not only pollutes the construction environment and does not meet the requirements of civilized construction on the construction site, but also has the risk of hole wall collapse and neck shrinkage. Summary of the invention

[0004] The invention provides a drill rod and engineering machinery, which are used to solve the problem in the prior art that mud discharge is not smooth and mud overflows from the upper end of the drill rod during mud wall protection construction.

[0005] The present invention provides a drill rod, comprising: an outer rod, a core rod arranged inside the outer rod, and an intermediate rod arranged between the outer rod and the core rod, wherein the intermediate rod and the core rod are telescopically arranged inside the outer rod in sequence, the top end of the intermediate rod is open, and at least a first water flow hole is provided on the side wall of the intermediate rod.

[0006] According to the drill rod provided by the present invention, the first water flow hole is arranged at a position close to the top end of the drill rod, and a plurality of the first water flow holes are distributed at intervals along the circumferential direction on the side wall of the intermediate rod.

[0007] According to the drill rod provided by the present invention, a plurality of the intermediate rods are provided, and when the plurality of the intermediate rods are in a retracted state, the positions of the first water flow holes on the plurality of the intermediate rods are correspondingly arranged, or the first water flow hole on the intermediate rod located on the outer side is lower than the first water flow hole on the intermediate rod located on the inner side.

[0008] According to the drill rod provided by the present invention, the middle rod includes a secondary outer rod adjacent to the outer rod, the outer wall of the secondary outer rod is connected to a first baffle ring assembly, the first baffle ring assembly includes a first baffle ring arranged at the top end of the secondary outer rod, and the first water flow hole on the secondary outer rod is arranged close to the bottom end of the secondary outer rod relative to the first baffle ring.

[0009] According to the drill rod provided by the present invention, the inner wall of one end of the first retaining ring is connected to the outer wall of the secondary outer rod, and the other end extends out of the top end of the secondary outer rod. The inner side of the other end of the first retaining ring is connected to a limiting ring, and the inner diameter of the limiting ring is larger than the outer diameter of the core rod and smaller than the outer diameter of the intermediate rod adjacent to the core rod.

[0010] According to the drill rod provided by the present invention, the intermediate rods are provided with a plurality of them, the outer wall of the intermediate rod located between the core rod and the secondary outer rod is connected with a second baffle ring assembly, and the first water flow hole on the intermediate rod located between the core rod and the secondary outer rod is arranged close to the top end of the intermediate rod relative to the second baffle ring assembly.

[0011] According to the drill rod provided by the present invention, a cover plate is connected to the top end of the outer rod, the cover plate is ring-shaped, and the inner diameter of the cover plate is larger than the outer diameter of the core rod and smaller than the outer diameter of the first retaining ring.

[0012] According to the drill rod provided by the present invention, at least the outer rod and the middle rod are respectively provided with a through second water flow hole near the bottom end.

[0013] According to the drill rod provided by the present invention, the outer walls of the outer rod and the intermediate rod are respectively provided with a plurality of external keys along the circumferential direction, support plates are respectively connected between two adjacent external keys on the outer wall of the outer rod and between two adjacent external keys on the outer wall of the intermediate rod, and openings are provided on the support plates, and the openings are arranged corresponding to the second water flow holes.

[0014] The present invention also provides an engineering machine, comprising the above-mentioned drill rod.

[0015] A drill rod and engineering machinery provided by the present invention are provided with an open top end of an intermediate rod. When mud in the inner cavity of an outer rod overflows from the upper end of the drill rod, the overflowed mud can enter the inner cavity of the intermediate rod from the open top end of the intermediate rod, thereby increasing the discharge channel of the mud and facilitating the smooth discharge of the mud. A through first water flow hole is provided on at least the side wall of the intermediate rod, so that the inner cavity of the outer rod and the inner cavity of the intermediate rod are in a through shape through the first water flow hole, which is conducive to the mud in the inner cavity of the outer rod entering the inner cavity of the intermediate rod for discharge, thereby improving the slurry discharge capacity. When the mud in the inner cavity of the outer rod overflows from the upper end of the drill rod, the overflowed mud can enter multiple inner cavity channels through the first water flow hole, which is conducive to accelerating the discharge of mud and reducing the risk of mud overflowing from the upper end of the drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the arrangement of the first water flow hole on the drill pipe provided by the present invention;

[0018] Figure 2 It is a schematic diagram of the working principle of the first water flow hole on the drill rod provided by the present invention;

[0019] Figure 3 It is a structural schematic diagram of the secondary outer rod provided by the present invention;

[0020] Figure 4 is a schematic structural diagram of the intermediate rod provided by the present invention;

[0021] Figure 5 It is a schematic diagram of the arrangement of the first water flow hole and the second water flow hole on the drill pipe provided by the present invention;

[0022] Figure 6 It is a schematic diagram of the arrangement of the second water flow hole on the drill pipe provided by the present invention;

[0023] Reference numerals:

[0024] 1: outer rod; 2: secondary outer rod; 3: middle rod; 4: core rod; 5: first water flow hole; 6: first baffle ring assembly; 61: first baffle ring; 62: limit ring; 7: second baffle ring assembly; 8: cover plate; 9: second water flow hole; 10: support plate; 11: flat head; 12: square head; 13: outer key; 14: inner key. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Combine the following Figures 1 to 6 The drill rod and engineering machine of the present invention are described.

[0027] refer to Figure 1This embodiment provides a drill rod, which includes: an outer rod 1, a core rod 4 arranged inside the outer rod 1, and an intermediate rod 3 arranged between the outer rod 1 and the core rod 4, wherein the intermediate rod 3 and the core rod 4 are telescopically arranged inside the outer rod in sequence, the top end of the intermediate rod 3 is open, and at least a through first water flow hole 5 is provided on the side wall of the intermediate rod 3. The outer rod 1 is the outermost rod of the drill rod, and the core rod 4 is the innermost rod of the drill rod. The core rod 4 is telescopically sleeved in the adjacent intermediate rod 3, and the intermediate rod 3 is telescopically sleeved in the outer rod 1.

[0028] In this embodiment, there is at least one intermediate rod 3. When multiple intermediate rods 3 are provided, the multiple intermediate rods 3 are telescopically sleeved in sequence. In this embodiment, it is considered that during the mud wall protection construction process, when the drill rod is lifted, as the core rod 4 and the intermediate rod 3 are gradually retracted to the inner side of the outer rod, the gap between the drill rod layers is too small, which will cause the mud in the gap between the drill rod layers to be unable to be quickly discharged downward, mainly because the mud in the inner cavity of the outer rod 1 is difficult to discharge, which will produce a cut-off effect at the upper end of the drill rod, causing the mud to overflow from the upper end of the drill rod.

[0029] refer to Figure 2 , Figure 2 The direction indicated by the middle arrow is the flow direction of the mud overflowing from the upper end; in this embodiment, the top of the middle rod 3 is set to be open. When the mud in the inner cavity of the outer rod 1 overflows from the upper end of the drill pipe, the overflowed mud can enter the inner cavity of the middle rod 3 from the top of the middle rod 3, thereby increasing the discharge channel of the mud, which is conducive to the smooth discharge of the mud and reduces the risk of mud overflowing from the upper end of the drill pipe. Further, in this embodiment, at least the side wall of the middle rod 3 is provided with a through first water flow hole 5, that is, the first water flow hole 5 penetrates the side wall of the rod body. The inner cavity of the outer rod and the inner cavity of the middle rod 3 can be through through the first water flow hole 5, which is conducive to the mud in the inner cavity of the outer rod entering the inner cavity of the middle rod 3 for discharge, thereby improving the slurry discharge capacity; and when the mud in the inner cavity of the outer rod overflows from the upper end of the drill pipe, the overflowed mud can enter multiple inner cavity channels through the first water flow hole 5, which is conducive to accelerating the discharge of the mud and reducing the risk of mud overflowing from the upper end of the drill pipe.

[0030] Furthermore, a first water flow hole 5 may be provided on the side wall of the middle rod 3; the first water flow hole 5 may also be provided on the side walls of both the middle rod 3 and the core rod 4; there is no specific limitation.

[0031] On the basis of the above embodiment, further, the first water flow hole 5 is arranged near the top of the drill rod; it is beneficial for the mud overflowing from the top of the drill rod to be quickly diverted and discharged near the top, reducing the risk of top overflow. A plurality of the first water flow holes 5 are distributed at intervals along the circumference on the side wall of the intermediate rod 3. In this embodiment, a through first water flow hole 5 is arranged on the side wall of the intermediate rod 3, and a plurality of first water flow holes 5 are distributed at intervals along the circumference of the intermediate rod 3, which is beneficial for accelerating the diversion and discharge of mud and improving the mud discharge capacity. Furthermore, opening the first water flow hole 5 on the intermediate rod 3 can not only improve the mud discharge capacity, but also eliminate the need for opening holes on the core rod 4, which is beneficial for ensuring the structural strength of the core rod 4.

[0032] On the basis of the above embodiment, further, the intermediate rod 3 is provided with a plurality of them, and when the plurality of the intermediate rods 3 are in the retracted state, the positions of the first water flow holes 5 on the plurality of the intermediate rods 3 are correspondingly arranged, or the first water flow holes 5 on the intermediate rods 3 located on the outside are lower than the first water flow holes 5 on the intermediate rods 3 located on the inside. In this embodiment, two or more intermediate rods 3 are provided, and the plurality of intermediate rods 3 have a retracted state and an extended state. In the retracted state, the plurality of intermediate rods 3 are aligned at the top ends and retracted into the outer rod 1; in the extended state, the plurality of intermediate rods 3 are extended sequentially from the outside to the inside, that is, the bottom end of the intermediate rod 3 adjacent to the outer rod 1 extends out of the outer rod 1, and the bottom ends of the plurality of intermediate rods 3 are extended sequentially from the outside to the inside.

[0033] When the plurality of intermediate rods 3 are in the retracted state, the first water flow holes 5 on the plurality of intermediate rods 3 correspond to each other, that is, the first water flow holes 5 on the plurality of intermediate rods 3 correspond to each other in the axial direction of the drill pipe, and the first water flow holes 5 on the plurality of intermediate rods 3 may be located on the same axial section, such as Figure 1 As shown, the axial section is the section perpendicular to the axial direction, which is beneficial to increase the degree of penetration between the inner cavities of the drill pipe and improve the slurry discharge capacity.

[0034] When the plurality of intermediate rods 3 are in the retracted state, the first water flow hole 5 on the outer intermediate rod 3 can be arranged to be lower than the first water flow hole 5 on the inner intermediate rod 3. Lower means arranged close to the bottom end of the drill pipe. That is, the first water flow holes on the plurality of intermediate rods 3 are arranged alternately in the axial direction; the openings of the outer intermediate rods 3 are successively lower than the openings of the inner intermediate rods 3. This is conducive to the flow of mud to the inner side of the inner intermediate rod, realizing the rapid diversion and discharge of mud inside the outer rod, and improving the mud discharge capacity.

[0035] Furthermore, when the plurality of intermediate rods 3 are in the retracted state and the positions of the first water flow holes 5 on the plurality of intermediate rods 3 are corresponding, the first water flow holes 5 on the plurality of intermediate rods 3 may also correspond in the radial direction. That is, the first water flow holes 5 on the plurality of intermediate rods 3 correspond in the radial direction of the drill pipe, and the first water flow holes 5 on the plurality of intermediate rods 3 may be located on the same radial section, such as Figure 1As shown, the radial cross section is the cross section along the radial direction. This is beneficial to increase the degree of penetration between the inner cavities of the drill pipe and improve the slurry discharge capacity. Further, when a plurality of first water flow holes 5 are arranged circumferentially on the intermediate rod 3, the first water flow holes 5 on the plurality of intermediate rods 3 can be arranged one by one.

[0036] Further, refer to Figure 1 and Figure 2 , the intermediate rod 3 includes a secondary outer rod 2 adjacent to the outer rod, the outer wall of the secondary outer rod 2 is connected to a first retaining ring assembly 6, the first retaining ring assembly 6 includes a first retaining ring 61 provided at the top of the secondary outer rod 2, and the first water flow hole 5 on the secondary outer rod 2 is provided near the bottom end of the secondary outer rod 2 relative to the first retaining ring 61. That is, the first water flow hole 5 on the secondary outer rod 2 is lower than the lower end of the first retaining ring 61. The first retaining ring assembly 6 is used to limit the intermediate rod 3 to prevent the intermediate rod 3 from being lifted out of the top of the drill rod, and is also used to achieve the guidance of telescopic movement between the secondary outer rod 2 and the outer rod.

[0037] Specifically, a first baffle ring 61 is connected to the outer wall of the top end of the secondary outer rod 2, and the first baffle ring 61 is arranged closer to the top than the first water flow hole 5 on the secondary outer rod 2, so that the first baffle ring 61 can play a certain blocking role on the overflow of mud in the inner cavity of the outer rod, which is beneficial to reduce the overflow of mud; and the mud in the inner cavity of the outer rod can flow to other inner cavities in time through the first water flow hole 5 on the secondary outer rod 2, which is beneficial to the diversion of mud in the inner cavity of the outer rod 1 and accelerates the slurry discharge speed.

[0038] On the basis of the above embodiment, further, the inner wall of one end of the first retaining ring 61 is connected to the outer wall of the secondary outer rod 2, and the other end extends out of the top of the secondary outer rod 2. The inner side of the other end of the first retaining ring is connected to a limiting ring 62, and the inner diameter of the limiting ring 62 is larger than the outer diameter of the core rod 4 and smaller than the outer diameter of the intermediate rod 3 adjacent to the core rod 4. That is, the limiting ring 62 is provided on the inner side wall of the first retaining ring 61 that is higher than the secondary outer rod 2.

[0039] The first retaining ring is connected to the outer wall of the secondary outer rod 2 along the circumference of the secondary outer rod 2, and the other end of the first retaining ring extends out of the top end of the secondary outer rod 2, which is conducive to the first retaining ring to smoothly limit the secondary outer rod 2 and prevent the secondary outer rod 2 from being raised from the top end of the drill rod; and a limiting ring 62 can be connected to the inner side of the extended part of the first retaining ring, and the limiting ring 62 can be used to limit the intermediate rod 3 between the secondary outer rod 2 and the core rod 4 to prevent the intermediate rod 3 between the secondary outer rod 2 and the core rod 4 from being raised from the top end of the drill rod.

[0040] Specifically, the limiting ring 62 is also arranged along the circumference of the drill pipe, and plays a limiting role on the middle rod 3 at the top of the middle rod 3 between the secondary outer rod 2 and the core rod 4. The inner diameter of the limiting ring 62 is set to be larger than the outer diameter of the core rod 4, so that a gap is left between the limiting ring 62 and the core rod 4, so that the mud overflowing from the top of the inner cavity of the outer rod can flow into the inner cavity of the middle rod 3 through the gap and be discharged. Figure 2 The inner diameter of the limiting ring 62 is further set to be smaller than the outer diameter of the intermediate rod 3 adjacent to the core rod 4, so that the limiting ring 62 can limit the intermediate rod 3 between the core rod 4 and the secondary outer rod 2.

[0041] Further, the first stop ring 61 can be annular, arranged in a circle along the circumference of the secondary outer rod 2; or it can be non-annular, arranged at intervals along the circumference of the secondary outer rod 2, without specific limitation, for the purpose of playing a limiting and guiding role. The limiting ring 62 can be annular, arranged in a circle along the circumference of the secondary outer rod 2; or it can be non-annular, arranged at intervals along the circumference of the secondary outer rod 2; without specific limitation, for the purpose of playing a limiting role.

[0042] On the basis of the above embodiment, further, the intermediate rod 3 is provided with a plurality of rods; that is, in this embodiment, at least two intermediate rods 3 are provided, and at least one intermediate rod 3 is provided between the core rod 4 and the secondary outer rod 2. The outer wall of the intermediate rod 3 located between the core rod 4 and the secondary outer rod 2 is connected with a second retaining ring assembly 7, and the first water flow hole 5 on the intermediate rod 3 located between the core rod 4 and the secondary outer rod 2 is arranged near the top end of the intermediate rod 3 relative to the second retaining ring assembly 7. The second retaining ring assembly 7 is used to realize the telescopic guidance between the intermediate rod 3 and the outer rod near the top end of the drill rod to improve the telescopic stability.

[0043] refer to Figure 2 In this embodiment, the second baffle ring assembly 7 on the middle rod 3 between the core rod 4 and the secondary outer rod 2 is arranged below the first water flow hole 5, that is, the second baffle ring assembly 7 is arranged closer to the bottom end relative to the first water flow hole 5. Compared with arranging the second baffle ring assembly 7 above the first water flow hole 5, the gap between the first water flow hole 5 and the top end can be increased, which is conducive to the mud overflowing from the top of the inner cavity of the outer rod 1 to quickly flow from the top of the middle rod 3 to the first water flow hole 5 for diversion, reducing the influence of the second baffle ring assembly 7 on the mud discharge, thereby helping to further improve the slurry discharge capacity of the drill pipe and reduce the risk of overflow.

[0044] On the basis of the above embodiments, further, referring to Figure 1 and Figure 2The top end of the outer rod 1 is connected with a cover plate 8, which is annular, and the inner diameter of the cover plate 8 is larger than the outer diameter of the core rod 4, and smaller than the outer diameter of the first retaining ring 61. The cover plate 8 is connected to the top end of the outer rod 1, and the cover plate 8 can cooperate with the first retaining ring 61 to limit the upward movement of the secondary outer rod 2, thereby preventing the secondary outer rod 2 from being lifted out of the top end of the drill pipe; the cover plate 8 can also block the overflow of the mud, which is conducive to reducing the overflow of the mud.

[0045] The inner diameter of the cover plate 8 is set to be larger than the outer diameter of the core rod 4, which can ensure the smooth telescopic movement of the core rod 4; the inner diameter of the cover plate 8 is set to be smaller than the outer diameter of the first baffle ring 61, which can ensure that the cover plate 8 blocks and limits the first baffle ring 61. Further, the inner diameter of the cover plate 8 can be set to be smaller than the outer diameter of the intermediate rod 3 adjacent to the core rod 4, which can ensure the limiting effect on the intermediate rod 3, and the smaller inner diameter of the cover plate 8 makes the gap at the top of the drill rod smaller, and the cover plate 8 can play a better blocking role in mud overflow.

[0046] Furthermore, a flange may be connected to the outer wall of the outer rod 1, and the cover plate 8 may be connected and fixed to the outer rod via the flange. Figure 3 In this embodiment, a plurality of first retaining ring assemblies 6 are provided at intervals along the axial direction of the secondary outer rod 2, which is conducive to better guiding between the secondary outer rod 2 and the outer rod 1; the first water flow hole 5 on the secondary outer rod 2 can be provided below the first retaining ring 61 located at the top of the secondary outer rod 2; a plurality of first water flow holes 5 can be provided, which can be evenly distributed along the circumference of the secondary outer rod 2, without specific limitation, so as to better discharge the mud and ensure the strength of the rod body. The first retaining ring assembly 6 and the secondary outer rod 2 can be connected by welding, or by other connection structures, without specific limitation.

[0047] refer to Figure 4 In this embodiment, the second baffle assembly 7 is provided with multiple intervals along the axial direction of the middle rod 3, which is conducive to better guiding the middle rod 3 and the outer rod body; the first water flow hole 5 on the middle rod 3 can be arranged above the second baffle assembly 7; multiple first water flow holes 5 can be provided, which can be evenly distributed along the circumference of the middle rod 3, without specific limitation, so as to better discharge the mud and ensure the strength of the rod body. The second baffle assembly 7 and the middle rod 3 can be welded or connected by other connection structures, without specific limitation.

[0048] On the basis of the above embodiments, further, referring to Figure 5 At least the outer rod 1 and the middle rod 3 are provided with a second water hole 9 near the bottom end. That is, the second water hole 9 penetrates the side wall of the rod body. The second water hole 9 is provided near the bottom end of the drill rod. During the process of lifting the drill rod, the mud in the inner cavity of the rod body can flow to the outside of the rod body through the second water hole 9, which is conducive to the rapid discharge of the mud, thereby improving the mud discharge capacity.

[0049] Further, a through second water flow hole 9 is respectively provided at the bottom end of the outer rod 1 and the middle rod 3; or, a through second water flow hole 9 is respectively provided at the bottom end of the outer rod 1, the core rod 4 and the middle rod 3. That is, the core rod 4 may be provided with a second water flow hole 9, or may not be provided with a second water flow hole 9. Optionally, a through second water flow hole 9 is respectively provided at the bottom end of the outer rod 1 and the middle rod 3; avoiding opening a hole on the core rod 4 can ensure the strength of the core rod 4.

[0050] On the basis of the above embodiments, further, referring to Figure 6 In this embodiment, a second water flow hole 9 is provided near the bottom of the outer rod 1 and the middle rod 3. Specifically, the outer walls of the outer rod 1 and the middle rod 3 are provided with a plurality of external keys 13 along the circumferential direction, and a support plate 10 is connected between two adjacent external keys 13 on the outer wall of the outer rod 1 and between two adjacent external keys 13 on the outer wall of the middle rod 3. The support plate 10 is provided with an opening, and the opening is provided corresponding to the second water flow hole 9. That is, the opening on the support plate 10 is connected with the second water flow hole 9. Figure 5 and Figure 6 The outer keys 13 on the outer walls of the outer rod 1 and the intermediate rod 3 can be arranged near the bottom. Support plates 10 are respectively arranged on the outer walls of the outer rod 1 and the intermediate rod 3. The support plates 10 are connected between two adjacent outer keys 13 to strengthen the rod structure. The support plates 10 can be welded to the adjacent outer keys 13 and the rod body.

[0051] Specifically, taking the setting of the support plate 10 and the second water flow hole 9 on the outer rod 1 as an example, there are multiple external keys 13 on the outer wall of the outer rod 1, and a matching space is formed between two adjacent external keys 13. Multiple external keys 13 form multiple matching spaces in the circumferential direction, and the support plate 10 is arranged in the matching space at intervals, that is, only one of the two adjacent matching spaces is provided with a support plate 10, and the other of the two adjacent matching spaces is used for matching and connecting with an external device such as a power head. The second water flow hole 9 on the outer rod 1 can be opened on the rod body corresponding to the matching space set by the support plate 10, and the second water flow hole 9 can pass through the support plate 10, so that the inner cavity of the outer rod 1 is connected with the outside, which is convenient for rapid discharge of mud.

[0052] The arrangement of the support plate 10 and the second water flow hole 9 on the middle rod 3 is similar to that of the outer rod 1. There are multiple external keys 13 on the outer wall of the middle rod 3, and a matching space is formed between two adjacent external keys 13. Multiple external keys 13 form multiple matching spaces in the circumferential direction. The support plate 10 is arranged in the matching space at intervals, that is, only one of the two adjacent matching spaces is provided with a support plate 10, and the other of the two adjacent matching spaces is used to match and connect with the inner key 14 on the outer rod of the middle rod 3. The second water flow hole 9 on the middle rod 3 can be opened on the rod body corresponding to the matching space set on the support plate 10, and the second water flow hole 9 can penetrate the support plate 10, so that the inner cavity of the middle rod 3 is connected with the outside, which is convenient for the rapid discharge of mud.

[0053] Specifically, refer to Figure 6 In this embodiment, the drill rod includes a core rod 4, an intermediate rod 3, a secondary outer rod 2 and an outer rod 1 from the inside to the outside, with a total of four layers of rod bodies; the outer rod 1 is provided with 6 external keys 13, and three support plates 10 are connected between the external keys 13, and the three support plates 10 are arranged at intervals, and a space for connecting the support plates 10 is provided between the external keys 13 to match the inner keys of the power head; in this embodiment, a second water flow hole 9 is opened at the corresponding position of each support plate 10 on the outer rod 1. The secondary outer rod 2 is also provided with 6 external keys 13, and three support plates 10 are connected between the external keys 13, and the three support plates 10 are arranged at intervals, and a space for connecting the support plates 10 is provided between the external keys 13 to match the inner keys 14 of the outer rod; in this embodiment, a second water flow hole 9 is opened at the corresponding position of each support plate 10 on the secondary outer rod 2. The middle rod 3 is also provided with 6 external keys 13, and three support plates 10 are connected between the external keys 13, and the three support plates 10 are arranged at intervals. Spaces connecting the support plates 10 are provided between the external keys 13 for matching with the internal keys 14 of the secondary outer rod 2; in this embodiment, a second water flow hole 9 is opened at the corresponding position of each support plate 10 on the middle rod 3.

[0054] Furthermore, the number of the outer keys 13 on the outer rod and the intermediate rod 3, the number of the support plates 10, and the number of the second water flow holes 9 can also be other, and are not specifically limited. For the outer rod or the intermediate rod 3, the second water flow holes 9 can be arranged in a one-to-one correspondence with the support plates 10, that is, each support plate 10 has a second water flow hole 9 at its corresponding position; the number of the second water flow holes 9 can also be different from the number of the support plates 10; and are not specifically limited.

[0055] Furthermore, the second water flow holes 9 on the outer rod 1 and the middle rod 3 are arranged at corresponding positions; that is, referring to Figure 6 , the second water flow holes 9 on the outer rod 1 and the middle rod 3 may correspond to each other in the radial direction of the drill rod, so that the second water flow holes 9 on the outer rod 1 and the middle rod 3 are sequentially connected from the outside to the inside. In other embodiments, the second water flow holes 9 on the outer rod 1 and the middle rod 3 may also be arranged in positions that are not corresponding to each other, and the specific limitation is not made.

[0056] Further, refer to Figure 5 The two ends of the drill rod are also connected with a flat head 11 and a square head 12. The specific structures of the flat head 11 and the square head 12 are similar to those of the existing drill rod, and will not be described in detail.

[0057] On the basis of the above embodiments, further, this embodiment provides an engineering machine, which includes the drill rod described in any of the above embodiments. The engineering machine can be a rotary drilling rig, or other machines that need to be equipped with a drill rod, and the specific details are not limited.

[0058] On the basis of the above embodiments, further, in the existing drill rod structure, during the mud wall protection construction process, the upper end of each section of the drill rod is a guide structure, so when the drill rod is in the telescopic state, the gap between the layers of the drill rod is too small; during the drill rod lifting process, the mud entering the inner cavity of one rod, that is, the outermost rod, cannot be quickly discharged downward, and the upper end produces a cutoff effect, causing the mud to overflow from the upper end of the drill rod. Based on this, this embodiment provides a fast slurry discharge drill rod structure, the drill rod includes a multi-layer rod body, each layer of the drill rod is welded by a rod body, an inner key 14 and an outer key 13, and the drill rod is composed of a multi-layer rod body telescopic sleeve assembly.

[0059] The fast grouting drill rod structure of this embodiment is to open an indefinite number of first water flow holes 5 in the upper guide section of the single-section drill rod. From the outside to the inside, the second outer first water flow holes 5 are opened between two retaining rings; the retaining rings at the top of the remaining middle-layer drill rods move downward a certain distance, and the first water flow holes 5 are opened on the uppermost rod body, above the retaining rings. This structure is conducive to the construction of the drill rod, and the mud flows into the innermost middle rod 3 along the first water flow holes 5 of the inner layer drill rod, which is used to improve the grouting capacity during the construction of the drill rod. An indefinite number of second water flow holes 9 are opened at the lower end of the single-section drill rod. When the drill rod is just lifted and in the unfolded state, the mud in the inner cavity of each section of the rod can be quickly discharged through the second water flow holes 9. During the contraction of the drill rod, the second water flow holes 9 are also conducive to the external discharge of mud, thereby improving the grouting capacity.

[0060] In this embodiment, first water flow holes 5 of indefinite number and size are opened in the guide section at the upper end of a single section of the drill rod; the second outer layer of first water flow holes 5 are opened between two retaining rings; the retaining rings at the top ends of the remaining middle layers of drill rods are moved downward by a certain distance, and the first water flow holes 5 are opened on the rod body above the uppermost retaining ring; by opening the first water flow holes 5 at the upper end, the interception effect generated at the upper end is reduced, so that the mud can quickly flow into the gaps between the drill rods along the first water flow holes 5, thereby increasing the flow area, increasing the fluidity, and achieving the effect of rapid slurry discharge.

[0061] An indefinite number of second water flow holes 9 are provided at the lower end of the single-section drill rod; the slurry discharge speed of the drill rod is increased during the drill rod construction process, thereby solving the problem of poor slurry discharge of the drill rod.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drill pipe, characterized in that: include: An outer rod, a core rod arranged inside the outer rod, and an intermediate rod arranged between the outer rod and the core rod, wherein the intermediate rod and the core rod are sequentially telescopically arranged inside the outer rod, the top end of the intermediate rod is open, and at least a first water flow hole is provided on the side wall of the intermediate rod; when the mud in the inner cavity of the outer rod overflows from the upper end of the drill rod, the overflowed mud can enter the inner cavity of the intermediate rod from the top end of the intermediate rod, thereby increasing the discharge channel of the mud; The first water flow hole is arranged near the top end of the drill rod, and a plurality of the first water flow holes are distributed at intervals along the circumferential direction on the side wall of the intermediate rod; The intermediate rod comprises a secondary outer rod adjacent to the outer rod, the outer wall of the secondary outer rod is connected with a first baffle assembly, the first baffle assembly comprises a first baffle ring arranged at the top end of the secondary outer rod, and the first water flow hole on the secondary outer rod is arranged close to the bottom end of the secondary outer rod relative to the first baffle ring; The inner wall of one end of the first retaining ring is connected to the outer wall of the secondary outer rod, and the other end extends out of the top end of the secondary outer rod. The inner side of the other end of the first retaining ring is connected to a limiting ring, and the inner diameter of the limiting ring is larger than the outer diameter of the core rod and smaller than the outer diameter of the intermediate rod adjacent to the core rod.

2. The drill pipe according to claim 1, characterized in that: There are multiple intermediate rods. When the multiple intermediate rods are in a retracted state, the positions of the first water flow holes on the multiple intermediate rods are correspondingly arranged, or the first water flow hole on the intermediate rod located on the outer side is lower than the first water flow hole on the intermediate rod located on the inner side.

3. The drill pipe according to claim 1, characterized in that: The intermediate rod is provided with multiple ones, and the outer wall of the intermediate rod located between the core rod and the secondary outer rod is connected to the second baffle ring assembly, and the first water flow hole on the intermediate rod located between the core rod and the secondary outer rod is arranged close to the top end of the intermediate rod relative to the second baffle ring assembly.

4. The drill pipe according to claim 1, characterized in that: The top end of the outer rod is connected with a cover plate, the cover plate is ring-shaped, and the inner diameter of the cover plate is larger than the outer diameter of the core rod and smaller than the outer diameter of the first retaining ring.

5. The drill rod according to any one of claims 1 to 2, characterized in that: At least the outer rod and the middle rod are respectively provided with a through second water flow hole near the bottom end.

6. The drill pipe according to claim 5, characterized in that The outer walls of the outer rod and the intermediate rod are respectively provided with a plurality of external keys along the circumferential direction, and support plates are respectively connected between two adjacent external keys of the outer wall of the outer rod and between two adjacent external keys of the outer wall of the intermediate rod, and openings are respectively provided on the support plates, and the openings are arranged corresponding to the second water flow holes.

7. An engineering machine, characterized in that: The drill rod comprises the drill rod according to any one of claims 1 to 6.

Images