Ground hole forming device and ground hole forming grouting method

Abstract

The present application relates to the technical field of civil engineering, and particularly relates to a ground hole-forming device and a ground hole-forming grouting method. The ground hole-forming device comprises a support frame and a drill rod. The support frame is provided with a hammering device and a hoisting device for driving the hammering device to move up and down. The drill rod comprises multiple sub-rod bodies which are detachably connected in sequence from bottom to top to form a rod body. The hoisting device drives the hammering device to move downward, so that the sub-rod body below the hammering mechanism can be pressed into the ground. The hoisting device drives the hammering device to move upward, so that the distance between the hammering device and the ground is increased and an installation space is formed. The installation space is used for connecting the sub-rod body to be connected to the sub-rod body pressed into the ground. Then, the hoisting device drives the hammering device to move downward again, and the hammering device can press the sub-rod body to be connected into the ground. Therefore, the ground hole-forming device can press multiple sub-rod bodies into the ground respectively, so that the total height of the hole-forming device is reduced, and the drilling requirement at the position with height limit is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of civil engineering, in particular to a ground hole forming device and a ground hole forming grouting method. BACKGROUND

[0002] Grouting is often used for seepage prevention and reinforcement of poor soil, and a grouting hole needs to be drilled in the soil before grouting, and then grouting is performed in the grouting hole. The grout in the grouting hole fills, penetrates and compacts in the soil, so that the water and air in the soil particles or the rock cracks are discharged, and after a certain time of manual control, the grout will cement the original loose soil particles or cracks into a whole, forming a combination with new structure, high strength, high waterproof performance and good chemical properties.

[0003] Most of the embankments, channels, especially the embankments or buildings in cities and other infrastructure in China have complex structures and narrow construction environments, especially when there is a height limit at the drilling site, large drilling equipment cannot be used. SUMMARY

[0004] The technical problem to be solved by the present application is that when the height of the equipment is limited in the construction environment at the drilling site, the large drilling equipment cannot meet the use requirements.

[0005] In order to solve the above technical problems, the purpose of the present application is to provide a ground hole forming device, which comprises a support frame and a drill rod, the support frame is provided with a hammering device and a hoisting device for driving the hammering device to move up and down, the drill rod comprises a plurality of sub-rod bodies which are detachably connected in sequence from bottom to top to form a rod body, the hoisting device drives the hammering device to move downward, so that the hammering device presses the sub-rod body located below the hammering device into the ground; the hoisting device drives the hammering device to move upward, so that an installation space is formed between the hammering device and the ground, and the installation space is used for connecting the sub-rod body to be connected to the sub-rod body pressed into the ground.

[0006] As a preferred scheme, the hammering device comprises a counter for recording the number of hammering of the hammering device.

[0007] As a preferred scheme, the upper part of the sub-rod body located at the uppermost end of the drill rod is provided with a first lifting ring, the hammering device comprises a sliding block slidingly connected to the support frame and a fixed table hinged to one side of the sliding block, the fixed table can swing back and forth, the fixed table is provided with a hammer body and a driving mechanism for driving the hammer body to move up and down reciprocally, and the upper end of the sliding block is provided with a second lifting ring.

[0008] As a preferred solution, the hammer body is connected to the fixed platform in a sliding guide mode, the driving mechanism comprises a rotating driving device and a cam structure connected to the output shaft of the rotating driving device, and one side of the hammer body is provided with a stop block, the lower end of the stop block abuts against the cam structure.

[0009] As a preferred solution, the hammer body is internally provided with a containing cavity, and the containing cavity is provided with configured sand for adjusting the hammer weight.

[0010] As a preferred solution, the lifting device comprises a winch and a lifting rope wound on the winding wheel of the winch, the winch is arranged on the rear side of the support frame, the hammering device is arranged on the front side of the support frame, and the lifting end of the lifting rope crosses the top of the support frame and is connected with the hammering device.

[0011] A ground hole forming grouting method using the ground hole forming device, comprising the following steps:

[0012] Step S1, placing the support frame at the position to be drilled;

[0013] Step S2, lifting the hammering device by using the lifting device, and placing the first section of the sub-rod body below the hammering device;

[0014] Step S3, lowering the hammering device by using the lifting device, starting the hammering device, and hammering the first section of the sub-rod body to press the first section of the sub-rod body into the ground;

[0015] Step S4, lifting the hammering device by using the lifting device, and connecting the second section of the sub-rod body to the upper end of the first section of the sub-rod body;

[0016] Step S5, repeating steps S3 to S4 until all the sub-rod bodies are pressed into the ground;

[0017] Step S6, pulling out the drill rod;

[0018] Step S7, grouting into the drill hole.

[0019] As a preferred solution, in the step S3, the number of hammering when the depth of the first section of the sub-rod body into the soil is the set depth is recorded by using the counter; the hammer weight of the hammer body is adjusted so that the number of hammering when the depth of the first section of the sub-rod body into the soil is the set depth is greater than or equal to the first set number and less than or equal to the second set number.

[0020] As a preferred solution, the step S6 of “pulling out the drill rod” comprises:

[0021] Remove the second lifting ring from the lifting end of the lifting device, swing the fixed table to one side of the support frame, connect the first lifting ring to the output end of the lifting device, and use the lifting device to lift the drill pipe.

[0022] As a preferred solution, in the step S5, the number of hammering times consumed by each sub-rod body when it reaches the set depth is recorded, and the step S7 "grouting into the drill hole" includes:

[0023] In the step S7, the grouting is segmented from bottom to top in the drill hole, the grouting pressure of each segment is determined according to the set depth and the number of hammering times consumed by the corresponding set depth, and the grouting pressure of the segment with more hammering times is greater than that of the segment with less hammering times.

[0024] Compared with the prior art, the beneficial effects of the present application are:

[0025] The ground hole forming equipment of the present application comprises a support frame and a drill pipe, the support frame is provided with a hammering device and a lifting device for driving the hammering device to move up and down, the drill pipe comprises a plurality of sub-rod bodies which are sequentially and detachably connected to form a rod body from bottom to top, the lifting device drives the hammering device to move down, so that the sub-rod body located below the hammering mechanism can be pressed into the ground; the lifting device drives the hammering device to move up, so that the distance between the hammering device and the ground increases and forms an installation space, the installation space is used for connecting the to-be-connected sub-rod body to the sub-rod body pressed into the ground, and then the lifting device is used again to drive the hammering device to move down, so that the hammering device can press the to-be-connected sub-rod body into the ground; therefore, the ground hole forming equipment of the present application can press the plurality of sub-rod bodies into the ground respectively, so that the total height of the hole forming equipment is reduced, and the use requirement of the site where the drilling is required is met. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a side view of the ground hole forming equipment of the present application;

[0027] Figure 2 It is a front view of the ground hole forming equipment of the present application;

[0028] Figure 3 It is a top view of the ground hole forming equipment of the present application;

[0029] Figure 4 It is a structural schematic view of the hammering device when the hammer body is lifted up;

[0030] Figure 5 It is a structural schematic view of the hammering device when the hammer body falls down;

[0031] Figure 6 It is a structural schematic view of the lifting device;

[0032] Figure 7Structure diagram of the fixed platform and the sliding block when the hammering device is in the hammering position;

[0033] Figure 8 Structure diagram of the fixed platform and the sliding block when the hammering device is in the non-hammering position;

[0034] Figure 9 Structure diagram of the cam structure and the stopper when the hammer body is in the highest position;

[0035] In the figure, 1, support frame; 2, drill rod; 3, hammering device; 31, counter; 32, sliding block; 33, fixed platform; 35, driving mechanism; 351, rotary driving device; 352, cam structure; 3521, cam body; 3522, horizontal column; 36, stopper; 4, hoisting device; 41, winch; 42, hoisting rope. DETAILED DESCRIPTION

[0036] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0037] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application. It should be understood that the terms "first", "second", etc. are used to describe various information in the present application, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, the "first" information can also be referred to as "second" information without departing from the scope of the present application, and similarly, the "second" information can also be referred to as "first" information.

[0038] As Figures 1 to 8As shown, the preferred embodiment of the ground hole forming device of the present application comprises a support frame 1 and a drill rod 2, the support frame 1 is provided with a hammering device 3 and a hoisting device 4 for driving the hammering device 3 to move up and down, the drill rod 2 comprises a plurality of sub-rod bodies which are detachably connected in sequence from bottom to top to form a rod body, the hoisting device 4 drives the hammering device 3 to move down so that the hammering device 3 can press the sub-rod body below the hammering device 3 into the ground; the hoisting device 4 drives the hammering device 3 to move up so that an installation space is formed between the hammering device 3 and the ground, the installation space is used for connecting the sub-rod body to be connected to the sub-rod body pressed into the ground. The hoisting device 4 drives the hammering device 3 to move down, which can press the sub-rod body below the hammering mechanism 3 into the ground; the hoisting device 4 drives the hammering device 3 to move up, so that the distance between the hammering device 3 and the ground increases and forms an installation space, the installation space is used for connecting the sub-rod body to be connected to the sub-rod body pressed into the ground, and then the hoisting device 4 is used again to drive the hammering device 3 to move down, the hammering device 3 can press the sub-rod body to be connected into the ground; therefore, the ground hole forming device of the present application can press a plurality of sub-rod bodies into the ground respectively, so that the total height of the hole forming device is reduced, which meets the use requirements of the drilling site where the height of the device is limited.

[0039] In the embodiment, the upper part of the sub-rod body at the uppermost end of the drill rod 2 is provided with a first lifting ring, the hammering device 3 comprises a sliding block 32 which is slidably connected to the support frame 1 and a fixed table 33 which is hingedly connected to one side of the sliding block 32, the fixed table 33 can swing back and forth, the fixed table 33 is provided with a hammer body 34 and a driving mechanism 35 for driving the hammer body 34 to move up and down reciprocatingly, and the upper end of the sliding block 32 is provided with a second lifting ring. Specifically, as shown in the drawings,

[0040] In the embodiment, the upper part of the sub-rod body at the uppermost end of the drill rod 2 is provided with a first lifting ring, the hammering device 3 comprises a sliding block 32 which is slidably connected to the support frame 1 and a fixed table 33 which is hingedly connected to one side of the sliding block 32, the fixed table 33 can swing back and forth, the fixed table 33 is provided with a hammer body 34 and a driving mechanism 35 for driving the hammer body 34 to move up and down reciprocatingly, and the upper end of the sliding block 32 is provided with a second lifting ring. Specifically, as shown in the drawings, Figure 7 、 Figure 8 After the drilling of the drill rod 2 is completed, the lifting hook of the hoisting device 4 is removed from the second lifting ring, then the fixed table 33 is swung so that the fixed table 33 and the hammer body 34 arranged on the fixed table 33 swing to one side of the support frame 1; then the lifting hook of the hoisting device 4 is connected to the first lifting ring, and finally the drill rod 2 inserted into the soil is pulled out of the soil by using the hoisting device 4, so that the drill rod 2 is pulled out. Therefore, the hoisting device 4 of the present application can not only lift the hammering device 3, but also pull out the drill rod 2.

[0041] Specifically, the lower end of the fixed platform 33 is provided with a first locking mechanism for locking the fixed platform onto the slider. In this embodiment, the first locking mechanism is a first fastening screw, which passes through the fixed platform 13 and is screwed onto the slider. When it is necessary to swing the fixed platform, the first fastening screw can be unscrewed from the slider 32. The slider 32 is provided with a second locking mechanism for locking the slider 32 onto the support frame. In this embodiment, the support frame includes a base and a support column fixed on the base. The slider 32 is a sleeve fitted on the outside of the support column. The second locking mechanism is a second fastening screw that passes radially through the sleeve. The end of the second fastening screw abuts against the outside of the support column to lock the sleeve.

[0042] In this embodiment, the hammer body 34 is slidably guided and connected to the fixed platform 33. The driving mechanism 35 includes a rotary driving device 351 and a cam structure 352 connected to the output shaft of the rotary driving device 351 to prevent rotation. A stop block 36 is provided on one side of the hammer body 34, and the lower end of the stop block 36 abuts against the cam structure 352. Specifically, a vertically arranged guide rail is fixed on the fixed platform 33, and the hammer body 34 is connected to the guide rail; as shown... Figure 9 As shown, the cam structure 352 includes a cam body 3521 and a horizontal column 3522 fixed on the side of the cam body 3521 away from the rotary drive device 351. The outer side of the horizontal column 3522 abuts against the lower end of the stop block 36. The stop block 36 is rectangular and horizontally arranged. The length of the stop block 36 is greater than the rotation radius of the horizontal column 3522. The projection of the rotation center of the horizontal column 3522 onto the stop block 36 in the vertical direction is arranged close to the rear end of the stop block 36. This ensures that when the horizontal column 3522 pushes the stop block 36 upward, the lower end of the stop block 36 always abuts against the outer side of the horizontal column 3522. When the stop block 36 moves downward, the stop block 36 disengages from the horizontal column 3522, thereby enabling the hammer 34 to undergo free fall motion when it falls.

[0043] The hammer body 34 is internally provided with a receiving cavity, and the receiving cavity is provided with configuration sand for adjusting the weight of the hammer. By changing the weight of the hammer body 34, the hammering force can be changed, so that the weight of the hammer body 34 is adapted to the strength of the bottom layer; specifically, during drilling, the required number of hammering times when the first sub-rod body reaches a certain depth is obtained by using a counter. When the number of hammering times is less than or equal to the first set number of times, the weight of the hammer body 34 is reduced. This is because, if the weight of the hammer body 34 is too heavy, the number of hammering times when each depth reaches a certain depth will be too small. In the present embodiment, the strength of the soil layer needs to be determined by the number of hammering times. If the number of hammering times per unit depth is too small, the identification accuracy of the strength of the soil layer will be too low. When the number of hammering times when the first sub-rod body reaches a certain depth is greater than or equal to the second set number of times, the weight of the hammer body needs to be increased, so as to avoid low drilling efficiency caused by too high number of hammering times. In the present embodiment, the hoisting device 4 includes a winch 41 and a hoisting rope 42 wound on the winding wheel of the winch 41. The winch 41 is arranged at the rear side of the support frame 1, the hammering device 3 is arranged at the front side of the support frame 1, and the hoisting end of the hoisting rope 42 crosses the top of the support frame 1 and is connected with the hammering device 3. Specifically, the upper end of the support column is provided with a guide pulley, the hoisting rope 42 crosses the guide pulley and is connected with the hammer body 34 or the upper end of the drill hole.

[0044] In the present embodiment, the lower end of the support frame is provided with a plurality of rollers and a plurality of telescopic support legs. The support frame can be flexibly moved by the rollers. After the support frame is moved to a certain position, the length of the support legs is extended. Not only the support frame can be fixed on the ground, but also the support frame can be in a horizontal state by adjusting the length of each support leg, so that the support frame can be used on an inclined and uneven ground. The telescopic support leg can adopt the structure of a telescopic stud. In the present embodiment, the hammering device 3 and the hoisting device 4 are detachably connected to the support frame by bolts. After the drilling is completed, the hammering device 3 and the hoisting device 4 can be removed from the support frame, so as to facilitate the transportation of the ground hole forming equipment and improve the portability of the ground hole forming equipment.

[0045] An embodiment of a ground hole forming and grouting method using the above ground hole forming equipment, comprising the following steps:

[0046] Step S1, placing the support frame 1 at a position to be drilled;

[0047] Step S2, moving the hammering device 3 upward by using the hoisting device 4, and placing the first sub-rod body below the hammering device 3;

[0048] Step S3, moving the hammering device 3 downward by using the hoisting device 4, and starting the hammering device 3 to hammer the first sub-rod body, so as to press the first sub-rod body into the ground;

[0049] Step S4, moving the hammering device 3 upward by using the hoisting device 4, and connecting the second sub-rod body to the upper end of the first sub-rod body.

[0050] Step S5, loop step S3 to step S4 until all sub-rod body is pressed into the ground;

[0051] Step S6, pull out the drill rod;

[0052] Step S7, grouting into the drill hole.

[0053] In step S3, the first segment of the sub-rod body is hammered, and the number of hammering when the first segment of the sub-rod body enters the soil to the set depth is recorded by the counter 31; the weight of the hammer body 34 is adjusted so that the number of hammering when the first segment of the sub-rod body enters the soil to the set depth is greater than or equal to the first set number and less than or equal to the second set number. Specifically, in the present embodiment, the set depth is 50 cm, the first set number is 30 times, and the second set number is 200 times. The initial weight of the hammer body is 25 kg, and the weight of the hammer body can be increased or decreased by 10 kg each time. In order to facilitate the observation of the depth of the drill rod 2 by the staff, the outside of the drill rod is provided with a scale mark. During the hole forming process, the drill rod is advanced by 50 cm each time, and the zero reset button is pressed to record the number of hammering. By setting the number of hammering when the first segment of the sub-rod body enters the soil to the set depth to be greater than or equal to the first set number and less than or equal to the second set number, the drilling efficiency can be ensured, and the single depth of the sub-rod body when it is hammered is prevented from being too large, which can cause the resolution of the soil strength to be too low. Therefore, the drilling efficiency is ensured, and the accuracy of the evaluation of the strength of the soil at different depths is ensured. It should be noted that although the drill-in drill can evaluate the rock-soil body resistance by the drilling speed, and then determine the mechanical properties of the rock-soil body. However, this method is generally used for rock strength evaluation. Even after compaction or solidification treatment, the strength of the soil is still small, the drilling force of the drill is too large, the accuracy is not enough, and it is difficult to accurately evaluate the mechanical properties of the soil. The present application can determine the mechanical properties of the soil by the number of hammering, and then determine the weak part of the soil, so as to provide a basis for the design of grouting parameters.

[0054] Further, the "pulling out the drill rod" in step S6 includes:

[0055] The second lifting ring is removed from the lifting end of the lifting device 4, the fixed table 33 is swung to one side of the support frame 1, the first lifting ring is connected to the output end of the lifting device 4, and the drill rod 2 is lifted by the lifting device 4.

[0056] In step S5, the number of hammering consumed by each sub-rod body when it is advanced to the set depth is recorded, and step S7 "grouting into the drill hole" includes:

[0057] The grouting is segmented from bottom to top in the borehole, the grouting pressure of each segment is determined according to the set depth and the number of hammering corresponding to the set depth, and the grouting pressure of the segment with more number of hammering is greater than the grouting pressure of the segment with less number of hammering. Specifically, the number of hammering per 50cm depth can be used to judge the stratum condition. If the number of hammering per 50cm depth is less than or equal to 50 hammer, the stratum at this position is very weak, and the grouting amount at this position should be twice the design grouting amount during repair; if the number of hammering per 50cm depth is less than or equal to 100 hammer, the stratum at this position is relatively weak, and additional grouting is required during repair, and the grouting amount is one time of the design grouting amount; if the number of hammering per 50cm depth is greater than 100 hammer, the stratum at this position can be normally repaired according to the design scheme.

[0058] In summary, the ground hole forming equipment of the present application comprises a support frame 1 and a drill rod 2, the support frame 1 is provided with a hammering device 3 and a hoisting device 4 for driving the hammering device 3 to move up and down, the drill rod 2 comprises a plurality of sub-rod bodies which are sequentially detachably connected to form a rod body from bottom to top, the hoisting device 4 drives the hammering device 3 to move down so that the hammering device 3 presses the sub-rod body located below the hammering device 3 into the ground; the hoisting device 4 drives the hammering device 3 to move up so that an installation space is formed between the hammering device 3 and the ground, and the installation space is used for connecting the sub-rod body to be connected to the sub-rod body pressed into the ground. The hoisting device 4 drives the hammering device 3 to move down, which can press the sub-rod body located below the hammering mechanism 3 into the ground; the hoisting device 4 drives the hammering device 3 to move up, which increases the distance between the hammering device 3 and the ground and forms an installation space, and the installation space is used for connecting the sub-rod body to be connected to the sub-rod body pressed into the ground, and then the hoisting device 4 drives the hammering device 3 to move down again, and the hammering device 3 can press the sub-rod body to be connected into the ground; therefore, the ground hole forming equipment of the present application can press the plurality of sub-rod bodies into the ground respectively, which reduces the total height of the hole forming equipment and meets the use requirements of the hole forming position with height limit.

[0059] The above description is only the preferred embodiment of the present application, and it should be pointed out that those skilled in the art can make some improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A ground drilling device, characterized in that, The system includes a support frame (1) and a drill rod (2). The support frame (1) is equipped with a hammering device (3) and a lifting device (4) for driving the hammering device (3) to move up and down. The drill rod (2) includes multiple sub-rods that are detachably connected from bottom to top to form a rod body. The lifting device (4) drives the hammering device (3) to move down so that the hammering device (3) presses the sub-rods located below the hammering device (3) into the ground. The lifting device (4) drives the hammering device (3) to move up so that an installation space is formed between the hammering device (3) and the ground. The installation space allows the sub-rods to be connected to be connected to the sub-rods pressed into the ground. The upper part of the sub-rod body located at the uppermost end of the drill rod (2) is provided with a first lifting ring. The hammering device (3) includes a slider (32) that slides and is guided up and down on the support frame (1) and a fixed platform (33) hinged to one side of the slider (32). The fixed platform (33) can swing back and forth. The fixed platform (33) is provided with a hammer body (34) and a drive mechanism (35) for driving the hammer body (34) to move up and down reciprocally. The upper end of the slider (32) is provided with a second lifting ring. After the drill rod (2) has finished drilling, the hook of the lifting device (4) is removed from the second lifting ring, and then the fixed platform (33) is swung so that the fixed platform (33) and the hammer (34) set on the fixed platform (33) swing to one side of the support frame (1); then the hook of the lifting device (4) is connected to the first lifting ring, and finally the drill rod (2) inserted in the soil is pulled out of the soil by the lifting device (4).

2. The ground drilling equipment according to claim 1, characterized in that, The hammering device (3) includes a counter (31) for recording the number of times the hammering device strikes.

3. The ground drilling equipment according to claim 1, characterized in that, The hammer body (34) is slidably guided and connected to the fixed platform (33). The driving mechanism (35) includes a rotary driving device (351) and a cam structure (352) connected to the output shaft of the rotary driving device (351) to prevent rotation. A stop block (36) is provided on one side of the hammer body (34), and the lower end of the stop block (36) abuts against the cam structure (352).

4. The ground drilling equipment according to claim 1, characterized in that, The hammer body (34) has an internal cavity containing sand for adjusting the weight of the hammer.

5. The ground drilling equipment according to claim 1, characterized in that, The lifting device (4) includes a winch (41) and a lifting rope (42) wound on the reel of the winch (41). The winch (41) is located on the rear side of the support frame (1), and the hammering device (3) is located on the front side of the support frame (1). The lifting end of the lifting rope (42) crosses the top of the support frame (1) and is connected to the hammering device (3).

6. A ground-based hole-forming and grouting method, characterized in that, Using the ground drilling apparatus according to any one of claims 1 to 5 includes the following steps: Step S1: Place the support frame (1) at the position to be drilled; Step S2: Using the lifting device (4), move the hammering device (3) upward and place the first section of the rod below the hammering device (3); Step S3: Use the lifting device (4) to lower the hammering device (3), start the hammering device (3), and hammer the first section of the rod to press the first section of the rod into the ground; Step S4: Using the lifting device (4), move the hammering device (3) upward to connect the second sub-rod to the upper end of the first sub-rod; Step S5, repeat steps S3 to S4 until all sub-rods are pressed into the ground; Step S6: Pull out the drill rod; Step S7: Grout into the borehole; Step S6, "pulling out the drill rod", includes: Remove the second lifting ring from the lifting end of the lifting device (4), swing the fixed platform (33) to one side of the support frame (1), connect the first lifting ring to the output end of the lifting device (4), and use the lifting device (4) to lift the drill rod (2).

7. The ground drilling and grouting method according to claim 6, characterized in that, In step S3, during the hammering of the first segment rod, a counter (31) is used to record the number of hammerings when the depth of the first segment rod entering the soil is a set depth; the hammer weight of the hammer (34) is adjusted so that the number of hammerings when the depth of the first segment rod entering the soil is a set depth is greater than or equal to the first set number and less than or equal to the second set number.

8. The ground drilling and grouting method according to claim 6, characterized in that, In step S5, the number of hammer blows required for each sub-rod to advance to a set depth is recorded. Step S7, "grouting into the borehole," includes: Step S7: Grout into the borehole from bottom to top in sections. Determine the grouting pressure of each section based on the set depth and the number of hammer blows required to reach the set depth. The grouting pressure of the section with more hammer blows is greater than that of the section with fewer hammer blows.

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