CN219378416U - Drilling tool for in-situ repair drug injection and in-situ drug injection device adopting same - Google Patents

Abstract

The application belongs to the technical field of soil remediation, and in particular relates to a drilling tool for in-situ remediation and drug injection and an in-situ drug injection device adopting the drilling tool, wherein the drilling tool comprises: the drill rod is internally provided with an inner cavity, the inner cavity is divided into a medicine injection channel and a medicine injection cavity through an upper limit part, in addition, the top end and the bottom end are respectively provided with a medicine injection hole and a medicine injection hole, and the bottom end is also provided with a drill bit mounting hole; the blocking piece comprises a blocking head and a blocking rod, the blocking head can slide in the medicine injection cavity, and meanwhile, the blocking rod is driven to slide in the drill bit mounting hole; the drill bit is fixed at the bottom end of the plugging rod. In the drilling tool for in-situ repair injection and the in-situ injection device adopting the drilling tool, the injection hole can be controlled to be closed or opened by lifting or pressing down the drill rod, and particularly, the injection hole can be effectively prevented from being blocked by sundries in soil or groundwater in the repair environment after entering the repair environment and in a period of time when the injection hole is not injected or is suspended.

Description

Drilling tool for in-situ repair drug injection and in-situ drug injection device adopting same

Technical Field

The application belongs to the technical field of soil remediation, and particularly relates to a drilling tool for in-situ remediation and drug injection and an in-situ drug injection device adopting the drilling tool.

Background

In the in situ remediation of contaminated soil and groundwater, it is necessary to use equipment to inject the agent into the subsurface, react the agent with contaminants in the soil and groundwater, reduce their concentration below acceptable standards, or convert the contaminants to non-toxic or low-toxic substances, in order to achieve the purpose of remediation of the soil and groundwater.

In the remediation process, the agent needs to be injected into the soil or groundwater by means of an injection device. The existing in-situ repair technology mainly comprises two types of injection modes of medicaments, namely injection through a direct-pushing injection device, and injection through an injection well. In-situ direct injection refers to injecting a remediation agent into contaminated soil and groundwater through a drill stem of a direct injection device under a certain pressure. Injection well injection the injection well is constructed to add the agent to the soil or groundwater.

The prior art has the following defects that firstly, injection at one point position can be directly injected in a pushing way, after the injection at the point position is completed, a drill rod is pulled out, the injection at the next point position is carried out, and if the injection at the point position is needed to be injected again after the injection is completed, the injection at the point position is needed to be drilled again; secondly, the medicine injection channel on the drill rod is not provided with anti-blocking measures, so that the medicine cannot be injected due to the fact that the medicine is easily blocked by the soil after the medicine is drilled into the soil, frequent cleaning is needed, and the repairing period is seriously influenced; finally, the injection well needs to be built by equipment for injecting the medicine, so that the repairing cost is increased, the repairing period is prolonged, the residual injection well on the ground after the repairing is completed possibly affects the development and utilization of land parcels, and the well quality of the injection well cannot be guaranteed, so that the requirement of repairing engineering is sometimes difficult to meet, even the injection well is damaged in construction, and the construction is affected.

Disclosure of Invention

In order to solve at least one technical problem existing in the prior art, the application provides a drilling tool for in-situ repair drug injection and an in-situ drug injection device adopting the drilling tool.

In a first aspect, the present application discloses a drilling tool for in situ remediation, the drilling tool comprising:

the inner wall of the drill rod, which is close to the axial bottom end, is divided into an upper medicine injection channel and a lower medicine injection cavity by an annular upper limit part, the medicine injection channel is coaxially communicated with the medicine injection cavity, and a medicine inlet communicated with the medicine injection channel is formed in the side wall of the drill rod, which is close to the axial top end;

at least one medicine injection hole communicated with the medicine injection cavity is formed in the side wall of the drill rod at the middle upper part of the medicine injection cavity, and a drill bit mounting hole communicated with the medicine injection cavity and with the inner diameter smaller than the diameter of the cross section of the medicine injection cavity is formed in the axial bottom end of the drill rod;

the shutoff piece, it includes shutoff head and fixed setting are in the shutoff pole of shutoff head bottom end portion, wherein, the shutoff head can be in the medicine injection chamber along axial vertical slip, drives simultaneously the shutoff pole is in slide in the drill bit mounting hole, the outline shape of shutoff head and shutoff pole still is set to: when the plugging head slides upwards to the position that the top surface of the plugging head abuts against the upper limit part, the medicine injection hole can be plugged, meanwhile, the end surface of the bottom end of the plugging rod can still extend out of the drill bit mounting hole, and when the plugging head slides downwards relatively to a preset position, the medicine injection hole can be communicated with the medicine injection cavity above the top surface of the plugging head;

the drill bit is fixedly arranged at the bottom end of the plugging rod. Preferably, the inner diameter of the medicine injection cavity is larger than the inner diameter of the medicine injection channel, so that the upper limit part is formed at the joint of the medicine injection channel and the medicine injection cavity, and in addition, an annular lower limit part is formed at the joint of the medicine injection cavity and the drill bit mounting hole and used for limiting the plugging head from the bottom.

Preferably, the cross section shapes of the medicine injection cavity, the drill bit mounting hole, the blocking head and the blocking rod are all round.

Preferably, on the drill rod, the outer diameter of the drill rod at the positions of the medicine injection cavity and the drill bit mounting hole is larger than the outer diameter of the rest parts.

Preferably, two sealing grooves of the outer wall of the ring are arranged on the outer wall of the plugging head, sealing rings are arranged in the two sealing grooves, and the positions of the two sealing grooves are set such that: when in a blocking state, one of the two sealing rings is positioned above the medicine injection hole, and the other sealing ring is positioned below the medicine injection hole, so that the medicine is prevented from flowing out of the medicine injection hole and the drill bit mounting hole; in the drug injection state, the drug can only flow out from the drug injection hole, but cannot flow out or leak out from the drill bit mounting hole.

Preferably, the number of the drug-entering holes in the drill rod is one.

Preferably, the number of the medicine injection holes on the drill rod is two to four, and the medicine injection holes are uniformly distributed on the same cross section of the drill rod along the circumferential direction.

Preferably, a lifting joint is fixedly arranged at the end part of the axial top end of the drill rod.

In a second aspect, the present application also discloses an in situ drug injection device, including a drug tank, a drug injection pump, a drug delivery tube, and a drilling tool, wherein the drilling tool adopts the drilling tool for in situ repair drug injection according to any one of the first aspects;

wherein:

the medicament tank is used for containing medicament to be injected;

one end of the drug delivery pipe is communicated with the drug tank through the drug injection pump, and the other end of the drug delivery pipe is communicated with a drug inlet hole of the drilling tool in a sealing way and is used for pumping the drug to be injected in the drug tank into a drug injection channel of the drill rod through the drug injection pump;

in addition, a valve for controlling the on-off of the pipeline and a pressure gauge for measuring the pressure in the pipe are also arranged on the medicine delivery pipe.

Preferably, the in-situ medicine injection device further comprises a drilling machine, and the drilling machine is used for being connected with the drilling tool in an adapting mode, so that the drilling tool is controlled to perform earth boring operation.

The application has at least the following beneficial technical effects:

1) In the drilling tool and the in-situ medicine injection device, the blocking piece is fixedly connected with the drill bit and is arranged in the medicine injection hole in a sliding manner, when the drill bit enters the soil under the action of the drill rod, the drill bit is subjected to the resistance of the soil, so that the top surface of the blocking head abuts against the upper limiting part to block the medicine injection hole, and particularly, the medicine injection hole can be effectively prevented from being blocked by sundries in the soil or underground water in the repairing environment in a period of time when the medicine injection hole is not injected or is suspended after entering the repairing environment;

2) Based on the advantages of the above 1), the drilling tool and the drug injection device can enable the plugging head to relatively slide downwards until the drug injection hole is communicated with the drug injection cavity by slightly pulling up the drilling rod when the drilling tool and the drug injection hole thereof reach the target position, and then the drug is injected, namely the injection of the drug is controlled at any time, so that the drug injection effect and the repair period are ensured, and the repair efficiency and the repair effect are greatly improved;

3) In the drilling tool and the in-situ medicine injection device, the injection time and the injection quantity of the medicine are more controllable because the medicine injection hole is not required to be blocked, so that the medicine injection can be realized at multiple points at the same time (namely, the medicine injection operation can be carried out at the same time when a plurality of point positions can be drilled and the corresponding drilling tool and the medicine injection hole thereof reach the target positions of the corresponding point positions), and the repair efficiency and the repair effect are improved;

4) In the drilling tool and the in-situ medicine injection device, the number of medicine injection holes in the drill rod is 2-4, and the medicine injection holes are positioned on the same cross section and are uniformly distributed along the circumferential direction, so that the uniform injection of the medicine can be realized, and the repairing effect is improved;

5) The applied drilling tool and the in-situ drug injection device are more suitable for in-situ repair sites with small trial, pilot trial or smaller scale than the direct pushing injection equipment and the injection well;

6) Relative injection well, the drilling tool and the normal position of application annotate the medicine device and are more suitable for repairing the bad plot of permeability, secondly, this application accessible adjustment drilling tool realizes layering and annotates the medicine, and in addition, the drilling tool of this application can reuse, and the cost is lower, and the aperture is little, and drilling time is short, repair efficiency is high.

Drawings

FIG. 1 is a schematic view (cross-sectional view) of a portion of a drilling tool for in situ repair according to the present application;

FIG. 2 is a schematic structural view of an in situ drug delivery device of the present application;

wherein: 1-a drill rod; 101-an upper limit part; 102-a drill mounting hole; 103-a lower limit part; 2-a medicine injection channel; 3-a medicine injection cavity; 4-a drug-taking hole; 5-a medicine injection hole; 6-plugging piece; 601-plugging head; 602-plugging a rod; 603-sealing ring; 7-a drill bit; 8-lifting joint and 9-medicine delivery tube; 10-valve; 11-pressure gauge.

Detailed Description

In order to make the purposes, technical solutions and advantages of the implementation of the present application more clear, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application.

It should be understood that technical terms such as "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. may be referred to in the description of the present application as indicating orientations or positional relationships based on the drawings, only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present application.

The drilling tool for in-situ repair and injection and the in-situ injection device using the same are described in further detail below with reference to fig. 1 and 2.

In a first aspect, the present application discloses a drilling tool for in situ remediation injection of contaminated soil and groundwater; referring to fig. 1 and 2, the drilling tool may include a drill rod 1, a drill bit 7 at an axial bottom end of the drill rod 1, and a closure member 6 provided on the drill rod 1.

Specifically, the drill rod 1 may be a drill rod of a conventional material and shape (a straight rod with a circular cross section), and an inner cavity extending axially to the bottom end and opening at the bottom end is arranged in the drill rod (i.e., the drill rod 1 is a hollow tube); further, on the inner wall of the drill rod 1 near the axial bottom end, the inner cavity is divided into an upper medicine injection channel 2 and a lower medicine injection cavity 3 by an annular upper limit part 101, and the medicine injection channel 2 and the medicine injection cavity 3 are coaxially communicated by a through hole in the middle of the upper limit part 101;

further, at least one medicine inlet hole 4 is formed in one side wall of the drill rod 1, which is close to the axial top end of the drill rod, and the medicine inlet hole 4 is communicated with the medicine injection channel 2, wherein the medicine inlet hole 4 is used for being connected with a subsequent medicine delivery pipe 9; in addition, a side wall of the drill rod 1 near the axial bottom end of the drill rod is provided with at least one medicine injection hole 5 communicated with the medicine injection cavity 3, wherein the medicine injection hole 5 is used for injecting medicines into soil or underground water.

Further, a drill bit mounting hole 102 which is communicated with the medicine injection cavity 3 and has an inner diameter smaller than the cross section diameter (i.e. inner diameter) of the medicine injection cavity 3 is formed at the axial bottom end part of the drill rod 1.

It will be appreciated that the number of the drug access holes 4 and the specific distribution position may depend on the type of drug to be injected, and in this embodiment, as shown in fig. 2, the number of the drug access holes 4 on each drill rod 1 is preferably one.

In the embodiment, as shown in fig. 1, preferably, the number of the injection holes 5 on each drill rod 1 is four, and the four injection holes 5 are located on the same cross section of the drill rod 1 and are uniformly distributed along the circumferential direction (that is, the axial center of the drill rod 1 is used as the symmetrical center and symmetrically distributed, and the included angle between every two adjacent injection holes 5 is 90 °), so that the uniform injection of the medicament can be realized, the uneven injection condition is avoided, and the repairing effect is improved.

Further, the blocking piece 6 includes a blocking head 601 and a blocking rod 602 fixedly disposed at the bottom end of the blocking head 601; wherein the outer profile shape (including cross-sectional shape, size, axial height, etc.) of the occlusion head 601 and occlusion rod 602 is set to: the plugging head 601 can slide up and down along the axial direction in the medicine injection cavity 3, and meanwhile, the plugging rod 602 is driven to slide in the drill bit mounting hole 102; further, the outer profile shape of the occlusion head 601 and occlusion rod 602 is also configured to: when the blocking head 601 slides upwards until the top surface of the blocking head abuts against the upper limit part 101, the medicine injection hole 5 can be blocked, and meanwhile, the end surface of the bottom end of the blocking rod 602 can still extend out of the drill bit mounting hole 102; and, when the blocking head 601 is relatively slid down to a predetermined position, the medicine-injection hole 5 can be made to communicate with the medicine-injection chamber 3 located above the top surface of the blocking head 601.

It will be appreciated that the shape of the outer contour of the stopper 601 may be mainly determined according to the shape and size of the cross section of the drug injecting cavity 3, the axial height of the drug injecting cavity 3 and the axial position of the drug injecting hole 5 in the drug injecting cavity 3, and the shape may be, for example, cylindrical, square, etc., in this embodiment, in order to make the processing more convenient, it is preferable that the cross section of the drug injecting cavity 3 is circular, the shape of the corresponding stopper 601 is cylindrical, the outer diameter of the stopper 601 is slightly smaller than the inner diameter of the drug injecting cavity 3 (the sealing performance is ensured while the stopper 601 is convenient to slide), and when the stopper 601 is located at the bottommost portion of the drug injecting cavity 3, the top surface height of the stopper 601 is lower than the position of the drug injecting hole 5 in the drug injecting cavity 3.

In order to further ensure the tightness of the outer wall of the blocking head 601 and the inner wall of the medicine injection cavity 3, as shown in fig. 1, two sealing grooves of the outer wall of the ring are arranged on the outer wall of the blocking head, sealing rings 603 are arranged in the two sealing grooves, and the positions of the two sealing grooves are set such that: in the blocking state, one of the two sealing rings is positioned above the medicine injection hole, and the other sealing ring is positioned below the medicine injection hole, so that the medicine is prevented from flowing out of the medicine injection hole 5 and the drill bit mounting hole 102; in the drug injection state, the drug can only flow out from the drug injection hole 5, but cannot flow out or leak out from the drill bit mounting hole 102.

Similarly, the outer contour shape of the plugging rod 602 is mainly determined by the cross-sectional shape and the axial height of the drill bit mounting hole 102, in this embodiment, the cross-section of the drill bit mounting hole 102 is preferably circular, the plugging rod 602 is cylindrical, and the axial length of the plugging rod 602 is greater than the axial height of the drill bit mounting hole 102, so that when the plugging head 601 slides up to the top-most position, the bottom end face of the plugging rod 602 can protrude out of the drill bit mounting hole 102.

Correspondingly, the drill bit 7 is fixedly arranged at the bottom end of the plugging rod 602; in addition, since the drill bit 7 is a wearing part, for convenience of maintenance and repair, it is further preferable in this embodiment that the drill bit 7 is detachably fixed to the bottom end of the plugging rod 602, and particularly, threaded connection may be adopted.

Further, the upper limit portion 101 may be formed by various structures, for example, a ring (herein, a circular shape is taken as an example, or a ring shape with other shapes) is arranged in the inner cavity of the drill rod 1 by protruding inwards in the radial direction, and the ring is changed to be the upper limit portion 101; for another example, in the manner shown in fig. 1 in this embodiment, the cross-sectional area of the drug injecting cavity 3 is set to be larger than the cross-sectional area of the drug injecting channel 2, so that the upper limit part 101 is naturally formed at the joint of the two; accordingly, in order to secure the strength of the drill rod 1 at the position of the medicine-injecting chamber 3, the outer diameter of the drill rod 1 at the positions of the medicine-injecting chamber 3 and the drill-bit mounting hole 102 may be set to be larger than the outer diameter of the remaining part (the position above the medicine-injecting chamber 3).

Further, since the cross-sectional area of the drug injecting cavity 3 is larger than the cross-sectional area of the drill mounting hole 102, an annular lower limit part 103 is formed at the joint of the two parts, and the lower limit part 103 can be used for limiting the plugging head 601 from the bottom.

Further, as shown in fig. 2, the drilling tool for in-situ repair and drug injection of the present application may further comprise a lifting joint 8; specifically, the lifting joint 8 is fixedly arranged at the axial top end part of the drill rod 1, and is used for facilitating the adaptive connection of a drilling tool and a subsequent drilling machine.

In summary, in the drilling tool for in-situ repair injection, when the drill bit 7 enters the soil under the action of the drill rod 1, the drill bit 7 is driven by the resistance of the soil, the upper edge of the blocking head 601 stays at the lower edge of the upper limiting part 101, so that the injection hole 5 is blocked, the drilling tool is in a sealed state for preventing the repair agent from flowing out of the injection hole 5, the soil is prevented from entering the injection channel 2 to block the injection channel 2, and the repair agent is prevented from entering the soil or underground water through the injection hole 5, so that the effect of controlling injection is realized; in addition, since the blocking head 601 is restricted by the upper limit portion 101, the blocking head 601 does not move too much upward along with the drill bit 7 under the action of soil resistance, and thus the function of blocking the medicine injection hole 5 is not achieved.

When the drill bit 7 reaches the target position, the drill bit 1 is slightly pulled up upwards, the drill bit 7 is inconsistent with the moving distance of the drill bit 1 due to the friction force of soil, the distance of the drill bit 1 moving upwards relative to the drill bit 7 is larger (at this time, the drill bit 7 can drive the blocking head 601 to move downwards for a certain distance), the medicine injection hole 5 is not blocked by the blocking head 601, the medicine injection hole 5 is opened, the drilling tool is in a medicine injection state, and the repairing medicament enters the soil or underground water through the medicine injection hole 5 for repairing. When the injection is needed to be suspended, the drill rod 1 can be slightly pressed downwards, and meanwhile, the injection pump is closed, so that the injection channel 2 can be protected, and the blockage of the drill caused by the fact that the soil enters the injection channel 2 when the drill enters the soil and the injection is suspended is prevented. In addition, since the blocking head 601 is restricted by the lower limit portion 103, the blocking head 601 is not separated from the drill rod 1, and can stay in the medicine injection cavity 3. That is, the upper limit portion 101 and the lower limit portion 103 cooperate to restrict the movement track of the plugging head 601 and the drill bit 7 connected thereto, and prevent the drill bit 7 from being separated from the inherent track.

In a second aspect, the present application also discloses an in situ drug delivery device; as shown in fig. 2, the in-situ medicine injection device comprises a medicine tank (not shown), a medicine injection pump (not shown), a medicine delivery tube 9 and a drilling tool, wherein the drilling tool adopts the drilling tool for in-situ repairing medicine injection in any one of the first aspect. It should be emphasized here that fig. 2 is mainly used to show the connection relation between the drilling tool and the device such as the drug delivery tube 9, and the drilling tool in the drawing only shows a simple structure, and the specific structure (especially the structure of the bottom part) can be taken into fig. 1.

Specifically, the medicament tank is used for containing medicaments to be injected, and the quantity of the medicament tank can be selected according to the type of the medicaments to be injected.

One end of the drug delivery pipe 9 is communicated with the drug tank through the drug injection pump, and the other end of the drug delivery pipe is communicated with the drug inlet hole 4 of the drilling tool in a sealing way, so that the drug to be injected in the drug tank can be pumped into the drug injection channel 2 of the drill rod 1 through the drug injection pump.

In addition, a valve 10 for controlling the on-off of the pipeline and a pressure gauge 11 for measuring the pressure in the pipe are also arranged on the medicine delivery pipe 9.

Further, the injection device of the present application further comprises a drilling machine (not shown in the figures), which may be a variety of known suitable drilling machines, which are adapted to be connected to (the lifting joint 8 of) the drilling tool and to control the drilling tool to perform an earth boring operation (usually pushing the drilling tool directly down into the target position without rotation). When the earth boring operation is completed (i.e., after drilling to the target location), a medication pumping operation may be performed.

In summary, the in-situ medicine injection device can inject the repairing medicine again when reaching the target position, the medicine injection time is easier to control, and the opening and closing of the medicine injection state are easier to switch and control, so that the application range of the in-situ medicine injection device is wider; in addition, the drilling tool as the main component of the drilling tool can be realized by adopting common materials and processing technology, so that the drilling tool is more convenient to popularize and popularize.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A drilling tool for in situ repair injection, the drilling tool comprising:

the drill rod (1) is internally provided with an inner cavity which extends to the bottom end along the axial direction and is opened at the bottom end, and the inner wall of the drill rod (1) close to the axial bottom end is divided into an upper medicine injection channel (2) and a lower medicine injection cavity (3) through an annular upper limit part (101), the medicine injection channel (2) is coaxially communicated with the medicine injection cavity (3), and a medicine inlet hole (4) communicated with the medicine injection channel (2) is formed in the side wall of the drill rod (1) close to the axial top end;

at least one medicine injection hole (5) communicated with the medicine injection cavity (3) is formed in the side wall of the drill rod (1) at the upper middle part of the medicine injection cavity (3), and a drill bit mounting hole (102) communicated with the medicine injection cavity (3) and with the inner diameter smaller than the diameter of the cross section of the medicine injection cavity is formed in the axial bottom end of the drill rod (1);

the shutoff piece (6), it includes shutoff head (601) and fixed setting are in shutoff head (601) bottom tip shutoff pole (602), wherein, shutoff head (601) can slide along axial from top to bottom in annotating medicine chamber (3), drives simultaneously shutoff pole (602) slide in drill bit mounting hole (102), the outline shape of shutoff head (601) and shutoff pole (602) still is set to: when the plugging head (601) slides upwards to the top surface of the plugging head to abut against the upper limit part (101), the medicine injection hole (5) can be plugged, the bottom end surface of the plugging rod (602) can still extend out of the drill bit mounting hole (102), and when the plugging head (601) slides downwards relatively to a preset position, the medicine injection hole (5) can be communicated with the medicine injection cavity (3) above the top surface of the plugging head (601);

and the drill bit (7) is fixedly arranged at the bottom end of the plugging rod (602).

2. Drilling tool according to claim 1, characterized in that the inner diameter of the dosing chamber (3) is larger than the inner diameter of the dosing channel (2), whereby the upper limit part (101) is formed at the junction of the dosing channel (2) and the dosing chamber (3), and in addition, an annular lower limit part (103) is formed at the junction of the dosing chamber (3) and the drill mounting hole (102) for limiting the plugging head (601) from the bottom.

3. Drilling tool according to claim 2, wherein the cross-sectional shape of the dosing chamber (3), the bit mounting hole (102), the plugging head (601) and the plugging rod (602) is circular.

4. A drilling tool according to claim 3, characterized in that on the drill rod (1) the outer diameter at the location of the dosing chamber (3) and the drill bit mounting hole (102) is larger than the outer diameter of the rest.

5. A drilling tool according to claim 3, characterized in that two sealing grooves of the ring outer wall are provided on the plug outer wall, in which sealing grooves sealing rings (603) are placed, the positions of which are arranged such that: when in a blocking state, one of the two sealing rings is positioned above the medicine injection hole, and the other sealing ring is positioned below the medicine injection hole, so that the medicine is prevented from flowing out of the medicine injection hole (5) and the drill bit mounting hole (102); in the injection state, the medicine can only flow out from the injection hole (5) but cannot flow out or leak out from the drill mounting hole (102).

6. Drilling tool according to any of claims 1-5, wherein the number of feed holes (4) in the drill rod (1) is one.

7. Drilling tool according to claim 6, characterized in that the number of injection holes (5) in the drill rod (1) is two to four, evenly distributed circumferentially on the same cross section of the drill rod (1).

8. Drilling tool according to claim 6, characterized in that a lifting joint (8) is fixedly arranged at the axial tip end of the drill rod (1).

9. An in situ drug delivery device, characterized in that the in situ drug delivery device comprises a drug tank, a drug delivery pump, a drug delivery tube (9) and a drilling tool, wherein the drilling tool adopts the drilling tool for in situ repair drug delivery according to any one of claims 1-8;

wherein:

the medicament tank is used for containing medicament to be injected;

one end of the drug delivery pipe (9) is communicated with the drug tank through the drug injection pump, and the other end of the drug delivery pipe is communicated with the drug inlet hole (4) of the drilling tool in a sealing way and is used for pumping the drug to be injected in the drug tank into the drug injection channel (2) of the drill rod (1) through the drug injection pump;

in addition, a valve (10) for controlling the on-off of the pipeline and a pressure gauge (11) for measuring the pressure in the pipe are also arranged on the medicine conveying pipe (9).

10. The in situ bolus device of claim 9, further comprising a drilling rig adapted for connection with the drilling tool to control the drilling tool to perform an earth boring operation.