Drill rod for constructing cemented soil stiff anchor rod

Abstract

The drill rod comprises a drill bit part and a hollow drill rod body, the drill bit part comprises a shell, an anchor disc fixed in the shell and stirring blades welded to the shell, and the hollow drill rod body is connected to the shell in an inserted mode; when moving in the direction away from the drill bit part, the hollow drill rod can be separated from the drill bit part; the sheath steel pipe is inserted into the hollow drill rod and fixed to the shell, the grouting pipe is inserted into the sheath steel pipe, one end of the rod body is fixed to the anchor disc, and the other end of the rod body extends out of the sheath steel pipe. A first grouting hole is formed in the shell, and a second grouting hole is formed in the sheath steel pipe. When the method is used for constructing the cemented soil stiff anchor rod, hole forming, anchoring, grouting and other processes are integrally formed, the process is simple, the speed is high, and the quality is easy to control; the formed cement-soil pile body is uniform in internal structure and reliable in strength; tension of the anchor rod is uniformly distributed, so that stress concentration can be reduced; and the formed cement soil pile body is high in end strength and good in safety.

Description

Technical Field

[0001] This utility model relates to enlarged head anchor bolt technology, specifically to a drill rod used for constructing cement-soil rigid anchor bolts. Background Technology

[0002] High-pressure jet enlarged head anchor bolts are a new type of anchor bolt structure that forms a large-diameter anchor body by cutting the soil at the bottom of the anchor hole with high-pressure fluid and injecting cement grout. Detailed construction specifications are now available. Although this technology has a significant advantage in load-bearing capacity compared to traditional anchor bolts, the following technical bottlenecks still exist in actual construction:

[0003] (1) Soil residue problem: Existing technology is difficult to completely remove the cut soil in the enlarged head cavity. Especially when constructing in soft soil strata, the collapse of the hole in the enlarged head cavity occurs frequently, resulting in a large amount of soil residue. The residual soil and the grout form a mixed structure, which seriously weakens the strength of the anchor body.

[0004] (2) Structural forming defects: The cavity shape is irregular after the hole expansion operation, which makes it difficult to push the anchor plate in and the positioning accuracy is insufficient, which directly affects the stress performance of the anchor structure.

[0005] (3) Complexity of process: The current process includes multiple independent processes such as hole drilling, hole enlargement, hole cleaning, anchoring, and grouting in the ordinary section. The process connection requirements are high, the quality control nodes are scattered, and it is easy to cause the accumulation of construction errors.

[0006] The combined effect of the aforementioned problems leads to a significant deviation between the actual bearing capacity of the anchor bolts and the design value, especially in soft soil conditions where bearing capacity reduction often occurs, severely limiting the engineering applicability of this technology. Therefore, it is urgent to develop new construction techniques to address the shortcomings of existing technologies. Utility Model Content

[0007] To reduce the significant deviation between the actual bearing capacity and the design value of anchor bolts, this application proposes a drill rod for constructing cement-soil reinforced anchor bolts. The drill rod includes a drill head and a hollow drill rod extending along a first axis. The drill head includes a housing, an anchor plate fixed inside the housing, and stirring blades welded to the housing. The hollow drill rod is inserted into the housing and can drive the drill head to rotate. When the hollow drill rod moves away from the drill head, it can detach from the drill head. A guide cap is provided at the end of the housing away from the hollow drill rod, protruding away from the hollow drill rod.

[0008] The sheathed steel pipe is inserted into the hollow drill rod and fixed to the outer shell. The sheathed steel pipe and the hollow drill rod are coaxially arranged, and the grouting pipe is inserted into the sheathed steel pipe. One end of the rod passes through the inner cavity of the sheathed steel pipe and is fixed to the anchor plate by an anchor. The other end of the rod extends away from the drill head and protrudes from the sheathed steel pipe. A first grouting hole connecting the inside and outside of the outer shell is opened on the outer shell, and a second grouting hole connecting the inside and outside of the sheathed steel pipe is opened on the pipe wall of the sheathed steel pipe. Specifically, the steel blade is a helical blade.

[0009] This application has the following advantages:

[0010] 1. When using this drill rod to construct cement-soil reinforced anchor rods, the installation of the rod body and the injection of cement grout are completed simultaneously with drilling the anchor hole, making the hole forming, anchoring, and grouting processes integrated into one, simplifying the construction process, increasing the construction speed, and making the construction quality easy to control.

[0011] 2. Because steel blades can be used to mix cement and soil, the resulting cement-soil pile has a uniform internal structure and reliable pile strength.

[0012] 3. The cement-soil rigid anchor formed by the drill rod in this application provides full-length anchorage, resulting in a more uniform distribution of tension in the anchor, which reduces stress concentration and improves the safety of the anchorage system. In contrast, traditional enlarged head anchors only bear the force at the end of the anchor, and the tension is mainly concentrated on the end anchor, which can easily cause local stress concentration.

[0013] 4. After the cement-soil construction is completed, lift the hollow drill rod upwards and detach it from the drill head, leaving the drill head underground. Since the steel blades are made of steel, the end of the anchor rod is a blade-cement-soil rigid composite structure, which has the advantage of good integrity. By using steel blades, the strength of the cement-soil pile can be adjusted by increasing the number of mixing times and the amount of cement, so that the strength of the entire end is high and the safety is good.

[0014] 5. It can be used to construct vertical or inclined anti-pull-out anchors, applicable to a wide range of scenarios, including basement anti-buoyancy, inclined anchoring in foundation pit engineering, and inclined anchoring of flexible photovoltaic supports. Therefore, using this drill rod can effectively reduce the deviation between the actual bearing capacity of the anchor and the design value.

[0015] Furthermore, an end plate is fixedly installed inside the outer casing. This end plate is located on the side of the anchor plate facing the hollow drill rod, forming a grout cavity between the end plate and the anchor plate. The grouting pipe connects to this grout cavity. In the first axial direction, a first grouting hole is located between the end plate and the anchor plate, and the first grouting hole is within the height range of the steel blade. The grout cavity effectively maintains the pressure during grouting, preventing grout from overflowing upwards along the sheath.

[0016] Furthermore, to ensure the cement slurry can smoothly enter the grout chamber and the grouting pipe can be retrieved after grouting, the drill bit also includes a grouting connector. This connector is sealed and welded to the end plate and connects to the grout chamber. The grouting pipe is inserted into this connector, and pulling the pipe allows it to detach from the connector. Using the grouting connector, the cement slurry is smoothly injected into the grout chamber. Since the grouting pipe is inserted into the connector, pulling it allows it to detach from the connector for retrieval.

[0017] Furthermore, to ensure that the cement slurry can smoothly enter the guide cap, a slurry passage hole is provided on the anchor plate, penetrating the anchor plate.

[0018] Specifically, a driven component is fixed to the wall of the outer casing, and a pushing component is fixed to the wall of the hollow drill rod. When the hollow drill rod is inserted into the outer casing, the pushing component presses against the driven component circumferentially, enabling the hollow drill rod to drive the drill head to rotate synchronously. This design not only ensures that the hollow drill rod can drive the drill head to rotate, but also allows the hollow drill rod to separate smoothly along the axial direction when pulled, so as to retrieve the hollow drill rod.

[0019] Specifically, to facilitate fixing the drill rod, the outer casing has a drill bit steel tube extending along a first axis. The hollow drill rod is inserted into the drill bit steel tube, and a guide cap is fixed to the end of the drill bit steel tube away from the hollow drill rod. When assembling the drill rod, the rod body is first fixed to the anchor plate, then the anchor plate is welded to one end of the drill bit steel tube, allowing the rod body to extend from the other end of the drill bit steel tube. The guide cap is then welded to the drill bit steel tube. Alternatively, the anchor plate is first welded inside the drill bit steel tube, and after fixing the rod body to the anchor plate, the guide cap is then welded to the drill bit steel tube.

[0020] Furthermore, an end grouting hole is provided at the end of the guide cap away from the hollow drill rod. During construction, when the drill rod is drilling into the ground, cement grout is sprayed downwards from the end grouting hole. The cement grout not only wets the underground soil and reduces its hardness, but also pre-mixes the cement grout and the underground soil to improve the uniformity of the mixture.

[0021] Specifically, the pole includes at least one anchor cable or threaded steel bar. When the pole includes at least two anchor cables or threaded steel bars, these at least two anchor cables or threaded steel bars are evenly spaced around the central axis of the steel sleeve. The anchor cable can be steel strand or fiberglass composite anchor cable, and the threaded steel bar can be precision rolled threaded steel bar or ordinary threaded steel bar. In actual construction, appropriate materials can be selected to manufacture the pole according to actual needs.

[0022] The anchor cable can be either steel strand or fiberglass composite anchor cable. When the rod body is made of anchor cable, to prevent the drill bit from separating from the hollow drill rod, after the drill rod is assembled, the anchor cable needs to be tightened and fixed to the end of the sheath steel pipe away from the drill bit. When tensioning the anchor cable is required, it can be removed from the sheath steel pipe. However, when the rod body is made of threaded steel, it is not necessary to fix it.

[0023] When using any of the above-mentioned drill pipes to construct cement-soil reinforced anchors, the following steps shall be taken:

[0024] (1.1) Drill the drill rod into the ground along the set direction, and at the same time spray the first cement grout outward through the first grouting hole, so that the first cement grout mixes with the underground soil to form a cement-soil pile until the drill rod reaches the set depth.

[0025] (1.2) Remove the hollow drill rod, tension the rod body, and then inject the second cement grout into the sheath steel pipe through the grouting pipe. At the same time as injecting the second cement grout, lift the grouting pipe upward. The second cement grout diffuses outward through the second grouting hole and merges with the first cement grout. After the injection of the second cement grout is completed, the grouting pipe is retrieved; the drill head is left underground.

[0026] Alternatively, the following steps can be used to construct cement-soil reinforced anchors:

[0027] (2.1) Drill the drill rod into the ground along the set direction, and at the same time spray the first cement grout outward through the first grouting hole, so that the first cement grout mixes with the underground soil to form a cement-soil pile until the drill rod reaches the set depth.

[0028] (2.2) Remove the hollow drill rod, and then inject the second cement grout into the sheath steel pipe. The second cement grout diffuses outward through the second grouting hole and merges with the first cement grout; the drill bit remains underground.

[0029] In both of the above construction methods, the angle between the drill rod and the vertical direction is 0-60°.

[0030] In both of the above construction methods, the installation of the anchor rod and the injection of cement grout are completed simultaneously during the drilling of the anchor hole, integrating the processes of hole formation, anchoring, and grouting. This simplifies the construction process, increases construction speed, and makes quality control easier. The use of helical blades for mixing ensures a uniform internal structure and reliable pile strength in the resulting cement-soil pile. The completed cement-soil reinforced anchor rod is anchored along its entire length, resulting in a more uniform distribution of tension, reducing stress concentration and improving the safety of the anchoring system. In contrast, traditional enlarged-head anchor rods only bear force at the end, concentrating the tension on the end anchor, which can easily lead to localized stress concentration. Because the end of the anchor rod is a steel pipe helical blade cement-soil reinforced composite structure, it has the advantage of good integrity. The helical blades allow for adjustments to the strength of the cement-soil pile by increasing the number of mixing cycles and the amount of cement, resulting in high strength and good safety throughout the end. These construction methods are applicable to a wide range of scenarios, including basement anti-buoyancy, inclined anchoring in foundation pit projects, and inclined anchoring for flexible photovoltaic supports.

[0031] In the actual construction process, different construction methods can be adopted as needed. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the drill pipe structure in this application.

[0033] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0034] Figure 3 yes Figure 2 A schematic diagram after part of the structure has been removed.

[0035] Figure 4 yes Figure 3 A view from the center (BB direction).

[0036] Figure 5 This is a schematic diagram of the connection structure between the hollow drill rod and the drill head.

[0037] Figure 6 This is a flowchart of the construction process when using the drill rod of this application to construct cement-soil rigid anchor rods. Detailed Implementation

[0038] Example 1

[0039] The following section provides a detailed description of the structure of the drill rod used for constructing cement-soil reinforced anchor bolts. Please refer to [link to relevant documentation]. Figures 1-5 In the attached diagram, the direction of arrow Y indicates the direction of the first axis.

[0040] The drill rod includes a drill head 10 and a hollow drill rod 41 extending along a first axis. The drill head 10 includes a housing 101, an anchor plate 17 fixed inside the housing 101, and a helical blade 13 welded to the housing. The helical blade is made of steel. Specifically, in this embodiment, the housing 101 includes a drill bit steel pipe 12 extending along the first axis and a guide cap 11 fixed to the drill bit steel pipe. The guide cap 11 has a conical drill tip 111 protruding away from the drill bit steel pipe. The hollow drill rod is installed at the end of the drill bit steel pipe away from the guide cap, i.e., the guide cap protrudes away from the hollow drill rod. The guide cap is installed on the drill bit steel pipe after the rod body described below is fixed to the anchor plate 17.

[0041] The hollow drill rod 41 is inserted into the drill bit steel tube 12 of the outer casing. The hollow drill rod can drive the drill head to rotate, and when the hollow drill rod moves away from the drill head, it can disengage from the drill head. A driven member is fixed on the tube wall of the outer casing 101, and a pushing member is fixed on the tube wall of the hollow drill rod 41. When the hollow drill rod is inserted into the outer casing, the pushing member can press against the driven member circumferentially, so that the hollow drill rod can drive the drill head to rotate synchronously. Specifically, in this embodiment, the passive component is a first half-pipe 16 welded to the inner wall of the drill bit steel pipe 12, and the pushing component is a second half-pipe 44 welded to the inner wall of the hollow drill rod. The first half-pipe extends outward from the drill bit steel pipe, and the second half-pipe extends outward from the hollow drill rod. The hollow drill rod and the drill bit steel pipe are made of the same type of steel pipe, and the first half-pipe and the second half-pipe are cut from the same steel pipe along the central axis. When the hollow drill rod is inserted into the outer shell, the first half-pipe is inserted into the hollow drill rod, and the second half-pipe is inserted into the drill bit steel pipe. The side of the second half-pipe can press against the side of the first half-pipe, that is, the pushing component can press against the passive component circumferentially. When the hollow drill rod is rotated, the drill head can be rotated through the first half-pipe and the second half-pipe.

[0042] It is understood that in other embodiments, the first half-pipe and the second half-pipe can be welded to the outer walls of the drill bit steel pipe and the hollow drill rod, respectively. Alternatively, the pusher and the driven member can be designed as a spline structure that can be interlocked with each other. For example, a first strip-shaped protrusion extending along the first axis can be provided on the inner wall of the drill bit steel pipe, and a second strip-shaped protrusion extending along the first axis can be provided on the outer wall of the hollow drill rod. The outer diameter of the hollow drill rod is smaller than the inner diameter of the drill bit steel pipe. When the hollow drill rod is inserted into the drill bit steel pipe, the first strip-shaped protrusion and the second strip-shaped protrusion can be spaced apart. Alternatively, the first strip-shaped protrusion can be provided on the outer wall of the drill bit steel pipe, and the second strip-shaped protrusion can be provided on the inner wall of the hollow drill rod. The outer diameter of the drill bit steel pipe can be smaller than the inner diameter of the hollow drill rod, so that the drill bit steel pipe can be inserted into the interior of the hollow drill rod, and the first strip-shaped protrusion and the second strip-shaped protrusion can be spaced apart. Or, a notch can be used to replace the first strip-shaped protrusion or the second strip-shaped protrusion.

[0043] Anchor plate 17 is welded to the end of drill bit steel pipe 12 facing away from hollow drill rod. An end plate 14 is also welded inside drill bit steel pipe 12. The end plate 14 is located on the side of anchor plate 17 facing hollow drill rod, forming a slurry cavity 123 between the end plate and anchor plate. Sheath steel pipe 21 is inserted into hollow drill rod 41 and welded to end plate 14, so that sheath steel pipe is fixed to the outer shell via end plate 14. Sheath steel pipe and hollow drill rod are coaxially arranged.

[0044] The drill bit 10 also includes a grouting connector 43. A grout inlet hole 15 is located at the center of the end plate 14. The grouting connector is sealed and welded to the end plate and communicates with the grout inlet hole 15. The grouting connector extends away from the anchor plate. One end of the grouting pipe 42 is inserted into the grouting connector, allowing the grouting pipe to communicate with the grout chamber 123. Pulling the grouting pipe allows it to detach from the grouting connector. In this embodiment, the grouting pipe is specifically made of plastic. The grouting pipe is sleeved on the grouting connector and secured with clamps. When the grouting pipe is pulled, it can be removed from the grouting connector for recycling. It is understood that in another embodiment, the grouting connector can be omitted, and the grouting pipe can be tied to the rod described below and inserted into the grout inlet hole, allowing the cement grout to smoothly enter the grout chamber. Of course, the grouting pipe can also be made of metal pipe, and the grouting pipe can be movably inserted into the sheathed steel pipe and abutted against the edge of the grout inlet hole or the grouting pipe can be inserted into the grout inlet hole. If it is not necessary to recycle the grouting pipe, the grouting pipe can be welded to the end plate and the grouting pipe can be sealed to the grout inlet hole.

[0045] A first grouting hole 121 is provided on the drill bit steel pipe of the outer shell, connecting the inside and outside of the outer shell. In this embodiment, several first grouting holes 121 are provided along the circumference of the drill bit steel pipe. There is no specific limit to the number of first grouting holes, as long as the cement grout can be sprayed evenly into the surrounding soil. The number of first grouting holes is controlled between 2 and 20.

[0046] In the first axial direction, the first grouting hole is located between the end plate and the anchor plate, and the first grouting hole is within the height range of the spiral blade. An end grouting hole 112 is provided on the drill tip of the guide cap, that is, an end grouting hole is provided at the end of the guide cap away from the hollow drill rod. A second grouting hole 211 is opened on the wall of the sheath steel pipe, connecting the inside and outside of the sheath steel pipe.

[0047] In this embodiment, the rod is composed of three steel strands 22, which are specifically fixed by a clamp-type anchor. For each steel strand 22, a through hole 141 is opened on the end plate 14, and an anchoring hole 18 is opened on the anchor plate. After each steel strand 22 passes through the corresponding through hole 141 and anchoring hole 18 in sequence, a clamping plate group 31 is installed. The anchoring hole is a conical hole with the small end facing the end plate. The clamping plate group 31 is arranged in the anchoring hole 18. A pressing plate 33 is provided on the side of the anchor plate away from the end plate. After the locking bolt 34 passes through the bolt hole 172 on the anchor plate and the pressing plate, the pressing plate is connected to the anchor plate. There is a sleeve 32 on the steel strand between the anchor plate and the pressing plate. The two ends of the sleeve press against the end faces of the pressing plate and the clamping plate in the clamping plate group, so that one end of the rod passes through the inner cavity of the sheath steel pipe and is fixed on the anchor plate, and the other end of the rod extends away from the drill bit and extends out of the sheath steel pipe. To facilitate the entry of cement slurry into the guide cap, a slurry passage hole 171 is provided on the anchor plate to connect the slurry cavity and the inner cavity of the guide cap.

[0048] When assembling the drill pipe, first pass each steel strand through the anchor plate and end plate, and fix each steel strand to the anchor plate. Then weld the anchor plate and end plate inside the drill bit tube, allowing each steel strand to extend out of the drill bit tube. Finally, weld the guide cap to the drill bit tube. Alternatively, first weld the anchor plate and end plate inside the drill bit tube, then fix each steel strand to the anchor plate, and finally weld the guide cap to the drill bit tube.

[0049] Three steel strands 22 are evenly spaced around the central axis of the steel sleeve, and also evenly spaced around the grouting pipe. It is understood that the steel strands can also be replaced with fiberglass composite anchor cables; both steel strands and fiberglass composite anchor cables are anchor cables. In other embodiments, the rod body can also be made of threaded steel. When threaded steel is used to make the rod body, the rod body can be fixed with corresponding nuts, eliminating the need for clamp assemblies and related components. The threaded steel can specifically be precision-rolled threaded steel or ordinary threaded steel.

[0050] To prevent the drill bit from separating from the hollow drill pipe, after the drill pipe is assembled, the steel strand is tightened and fixed to the end of the sheath steel pipe away from the drill bit. When tensioning of the steel strand is required, it is then removed from the sheath steel pipe. When fiberglass composite anchor cables are used to make the rod body, a similar method is used to fix the fiberglass composite anchor cables to the sheath steel pipe. However, when threaded steel is used to make the rod body, no fixing is required.

[0051] The following describes the construction method for using the drill pipe described in this application to construct cement-soil reinforced anchor bolts. There are two construction methods, one of which includes the following steps:

[0052] (1.1) Please refer to Figure 6In steps (a) and (b), the drill rod is positioned at the designated location, and then drilled into the ground along the designated direction. Simultaneously, the first cement grout is injected into the grout chamber 123 through the grouting pipe. The first cement grout in the grout chamber is then sprayed outwards through the first grouting hole 121, mixing with the underground soil to form a cement-soil pile body 51. The cement grout in the grout chamber also enters the drill tip of the guide cap and is sprayed outwards through the end spray hole 112 to disturb the underlying soil and increase its moisture content, thereby accelerating the drilling speed. Please refer to [link to relevant documentation]. Figure 6 In step (c), continue drilling downwards and injecting the first cement slurry until the drill rod reaches the set depth.

[0053] In this embodiment, the drill rod extends vertically, meaning the angle between the drill rod and the vertical direction is 0°. It is understood that in other embodiments, the angle between the drill rod and the vertical direction is 10°, 20°, 30°, 45°, 50°, or 60°, or any other angle between 0° and 60°.

[0054] (1.2) Please refer to Figure 6 In step (d), the hollow drill rod is removed, and the steel strand 22, which serves as the rod body, is tensioned to generate prestress in the steel strand.

[0055] Please see Figure 6 In step (e), the second cement grout is injected into the sheath steel pipe through the grouting pipe. At the same time as the second cement grout is injected, the grouting pipe is lifted upward so that it is separated from the grouting connector. The second cement grout diffuses outward through the second grouting hole and merges with the first cement grout. After the injection of the second cement grout is completed, the grouting pipe is retrieved; the drill bit is left underground.

[0056] Another construction method includes the following steps:

[0057] (2.1) Drill the drill rod into the ground along the set direction, and simultaneously inject the first cement grout into the grout chamber 123 through the grouting pipe. The first cement grout in the grout chamber is sprayed outward through the first grouting hole 121, so that the first cement grout mixes with the underground soil to form a cement-soil pile body 51. At the same time, the cement grout in the grout chamber enters the drill tip of the guide cap and is sprayed outward through the end spray hole 112, so as to disturb the soil below and increase the humidity, thereby accelerating the drilling speed. Continue drilling downward and spraying the first cement grout until the drill rod reaches the set depth.

[0058] In this embodiment, the drill rod extends vertically, meaning the angle between the drill rod and the vertical direction is 45°. It is understood that in other embodiments, the angle between the drill rod and the vertical direction can be 0°, 10°, 20°, 30°, 40°, 50°, or 60°, or any other angle between 0° and 60°.

[0059] (2.2) Remove the hollow drill rod and grouting pipe, and then inject the second cement grout into the sheath steel pipe. The second cement grout diffuses outward through the second grouting hole and merges with the first cement grout; the drill bit remains underground.

[0060] It is understood that in other embodiments, the grouting pipe may be left directly underground.

Claims

1. A drill rod for constructing cement-soil reinforced anchor bolts, characterized in that, The device includes a drill head and a hollow drill rod extending along a first axis. The drill head includes a housing, an anchor plate fixed inside the housing, and steel blades welded to the housing. The hollow drill rod is inserted into the housing and can drive the drill head to rotate. When the hollow drill rod moves away from the drill head, it can disengage from the drill head. A guide cap is provided at the end of the housing away from the hollow drill rod, and the guide cap protrudes away from the hollow drill rod. The sheath steel pipe is inserted into the hollow drill rod and fixed to the outer shell. The sheath steel pipe and the hollow drill rod are coaxially arranged. The grouting pipe is inserted into the sheath steel pipe. One end of the rod passes through the inner cavity of the sheath steel pipe and is fixed to the anchor plate by the anchor. The other end of the rod extends away from the drill head and extends out of the sheath steel pipe. A first grouting hole connecting the inside and outside of the outer shell is opened on the outer shell. A second grouting hole connecting the inside and outside of the sheath steel pipe is opened on the pipe wall of the sheath steel pipe.

2. The drill pipe according to claim 1, characterized in that, An end plate is also fixedly installed inside the outer shell. The end plate is located on the side of the anchor plate facing the hollow drill rod. A grout cavity is formed between the end plate and the anchor plate. The grouting pipe is connected to the grout cavity. In the first axial direction, the first grouting hole is located between the end plate and the anchor plate, and the first grouting hole is located within the height range of the steel blade.

3. The drill pipe according to claim 2, characterized in that, The drill bit also includes a grouting connector, which is sealed and welded to the end plate and connects to the grout chamber. A grouting pipe is inserted into the grouting connector, and pulling the grouting pipe can disengage it from the grouting connector.

4. The drill pipe according to claim 2, characterized in that, A grout passage hole is provided on the anchor plate, penetrating the anchor plate.

5. The drill pipe according to claim 1, characterized in that, A driven component is fixed on the tube wall of the outer casing, and a pushing component is fixed on the tube wall of the hollow drill rod. When the hollow drill rod is inserted into the outer casing, the pushing component can press against the driven component circumferentially, so that the hollow drill rod can drive the drill head to rotate synchronously.

6. The drill pipe according to claim 1, characterized in that, The housing has a drill bit steel tube extending along a first axis, a hollow drill rod inserted into the drill bit steel tube, and a guide cap fixed at the end of the drill bit steel tube away from the hollow drill rod.

7. The drill pipe according to claim 6, characterized in that, An end spray hole is provided at the end of the guide cap away from the hollow drill rod.

8. The drill pipe according to claim 1, characterized in that, The rod includes at least one anchor cable or threaded steel bar. When the rod includes at least two anchor cables or threaded steel bars, the at least two anchor cables or threaded steel bars are evenly spaced around the central axis of the steel sleeve.

9. The drill pipe according to claim 1, characterized in that, The steel blade is a helical blade.

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