Retreating type segmented grouting equipment and using method thereof

Abstract

The invention discloses retreating type segmented grouting equipment and a using method thereof, and relates to the field of retreating type segmented grouting equipment. According to the retreating type segmented grouting equipment and the using method thereof, the retreating type segmented grouting equipment comprises a main rack, a drill rod and a pile casing, and a mounting unit, a contact unit and a pressure unit are arranged in the pile casing. According to the retreating type segmented grouting equipment and the using method thereof, when the extrusion base is located in the pile casing, the extrusion base is pushed to make contact with the pile casing and extrude the pile casing to be at the proper pressure, when grouting liquid is gradually grouted, the grouting liquid makes contact with the contact base to generate pressure on the contact base, and when the extrusion force of the extrusion base and the pile casing is reduced to the specified force, the grouting liquid is pushed to make contact with the contact base to generate pressure on the contact base. At the moment, the pressure of the contact seat and the grouting liquid pushes the connecting seat to move, so that the connecting seat drives the fixing rod and the mounting frame to move, the pressure of the grouting liquid on the contact seat is reduced, the pressure in the pile casing is limited to be in a proper range, and the situation that the pressure is too high or too low is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of backward-type segmented grouting equipment, in particular to backward-type segmented grouting equipment and a use method thereof. Background Art

[0002] Reverse segmented grouting means starting from the surface of the grouting hole and grouting layer by layer towards the depth. After grouting a certain distance each time, the grouting pipe is pulled back a certain distance and grouting is continued. This cycle is repeated until the grouting operation of the entire grouting hole is completed.

[0003] The backward grouting method uses layered grouting to form an effective curtain of slurry in the stratum, thereby achieving the purpose of strengthening the stratum and controlling the formation water flow.

[0004] At present, when grouting is carried out, after the grouting pipe has grouted a certain distance, the grouting pipe is pulled back for a certain distance, and after the grouting pipe retreats to the set position, grouting is continued, and this cycle is repeated until the grouting operation of the entire grouting hole is completed. During the grouting process, the grouting pressure and grouting amount are strictly controlled to avoid adverse effects on the surrounding environment. In the prior art, manual control is performed to control the grouting pressure of an area by driving the grouting pipe to move through the drill rod. This mainly relies on manual judgment and grouting rate, and requires high manual proficiency. When misjudgment occurs, incomplete grouting or excessive pressure may easily lead to structural damage, resulting in poor bearing capacity. Therefore, we propose a backward segmented grouting equipment and a method for using the equipment. Summary of the invention

[0005] Technical issues solved

[0006] In view of the deficiencies in the prior art, the present invention provides a backward-type segmented grouting equipment and a method for using the same, which solves the problem of controlling the grouting pressure of an area by human control and driving the grouting pipe to move by a drill rod. The equipment mainly relies on human judgment and grouting rate, which requires high human proficiency. When misjudgment occurs, incomplete grouting or excessive pressure may easily lead to structural damage, resulting in poor bearing capacity.

[0007] Technical Solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a backward segmented grouting equipment and a method of using the same, comprising a main frame, a drill rod and a casing, wherein the drill rod is connected to the end of the main frame, the drill rod is inserted into the casing, and the casing is provided with a mounting unit, a contact unit and a pressure unit, the end of the drill rod is connected to the mounting unit, and the mounting unit and the pressure unit are located above the contact unit.

[0009] The mounting unit comprises a mounting frame fixedly connected to the end of the drill pipe, and a plurality of fixing rods are fixedly connected to the bottom end surface of the mounting frame;

[0010] The contact unit comprises a connection seat fixedly connected to the ends of a plurality of fixing rods, and a contact seat is arranged below the connection seat;

[0011] The pressure unit comprises a sliding rod slidably connected to a connecting seat, an end of the sliding rod is fixedly connected to a mounting seat, and an extrusion seat is connected above the mounting seat via bolts.

[0012] Preferably, a plurality of connection holes are provided on the mounting frame, and a plurality of grouting pipes are connected inside the connection holes.

[0013] Preferably, a protective tube is provided directly below the plurality of grouting tubes on the connection hole, and the protective tube is fixedly connected to the inner wall of the contact seat and the connection seat.

[0014] Preferably, a linkage seat is slidably connected to the inner wall of the connecting seat, a threaded rod is fixedly connected to the bottom end face of the linkage seat, a connecting rod is slidably connected to the outer peripheral wall of the threaded rod, and the connecting rod is fixedly connected to the top end face of the contact seat.

[0015] Preferably, an outer peripheral wall of the threaded rod is threadedly connected with an adjustment seat, and the adjustment seat is rotatably connected to the connecting rod.

[0016] Preferably, the outer peripheral wall of the linkage seat is fixedly connected with a rotating seat, the inner wall of the rotating seat is rotatably connected with a plurality of rotating rods, the other end of the rotating rod is rotatably connected with a moving seat, and the moving seat is fixedly connected with the corresponding sliding rod.

[0017] Preferably, a spring is sleeved on the outer peripheral wall of the sliding rod, one side of the spring is fixedly connected to the mounting seat, and the other side of the spring is fixedly connected to the guide seat.

[0018] Preferably, the guide seat is fixedly connected to the top end surface of the connecting seat, and the guide seat is slidably connected to the sliding rod.

[0019] A method for using a backward segmented grouting device comprises the following steps:

[0020] By fixing the drill rod with the mounting frame, passing the grouting pipe through the connection hole, and then passing the grouting pipe through the protective pipe out of the contact seat, the grouting pipe is fixedly connected with the protective pipe, and grouting is first performed on a grouting section at the bottom through the grouting pipe. After grouting a certain distance, the grouting pipe is pulled back for a certain distance, and grouting is continued, and this cycle is repeated until the grouting operation of the entire grouting hole is completed;

[0021] At this time, the grouting liquid is discharged from the grouting pipe, so that the grouting liquid is under the contact seat, and the grouting liquid contacts the contact seat, pushing the contact seat to move, so that the linkage seat moves, driving the rotating seat to move, driving the multiple rotating rods to rotate, and at this time the rotating rod pulls the moving seat to move, so that the sliding rod drives the mounting seat and the extrusion seat to move, and under the movement of the mounting seat, the mounting seat compresses the spring, so that the spring is compressed between the mounting seat and the guide seat;

[0022] At this time, the extrusion pressure between the extrusion seat and the inner wall of the casing gradually decreases. When the extrusion pressure between the extrusion seat and the casing is reduced to a specified force, the pressure between the contact seat and the grouting liquid pushes the connecting seat to move, so that the connecting seat drives the fixing rod and the mounting frame to move, reducing the pressure of the grouting liquid on the contact seat, and limiting the pressure in the casing to a suitable range;

[0023] When the connecting seat moves, the distance between the connecting seat and the contact seat changes. At this time, the connecting rod, the threaded rod and the linkage seat move relative to the connecting seat, so that the connecting seat drives the rotating rod to rotate, so that the guide seat moves. At this time, under the rebound of the spring, the mounting seat and the extrusion seat are driven to move, so that the extrusion seat contacts the inner wall of the casing;

[0024] Under the extrusion of the extrusion seat and the casing, a reverse pressure is applied to the connecting seat and the contact seat. At this time, the contact seat applies pressure to the injection slurry to ensure the grouting effect. At the same time, the movement of the connecting seat makes the protection pipe and the injection pipe move, which is convenient for continuous grouting and continuous pulling out of the grouting pipe to gradually form grouting holes. It is suitable for geological conditions where holes are difficult to form, such as hard rock formations and compacted soil formations, to ensure the injection effect. By continuously grouting in sections and withdrawing the grouting pipe, it is ensured that the grouting slurry can fully fill and reinforce the formation.

[0025] The present invention discloses a backward segmented grouting device and a method for using the same, which has the following beneficial effects:

[0026] 1. The backward segmented grouting equipment and its use method, when the extrusion seat is in the casing, the spring rebounds to push the extrusion seat to contact and extrude the casing, and the pressure is at a suitable pressure. When the grouting liquid is gradually injected, the grouting liquid contacts the contact seat, and a pressure is generated on the contact seat. When the extrusion force between the extrusion seat and the casing is reduced to a specified force, the pressure of the contact seat and the grouting liquid pushes the connecting seat to move, so that the connecting seat drives the fixing rod and the mounting frame to move, reducing the pressure of the grouting liquid on the contact seat, limiting the pressure in the casing to a suitable range, and avoiding the occurrence of excessive or low pressure.

[0027] 2. The backward segmented grouting equipment and its use method are achieved by fixedly connecting the drill rod with the mounting frame, and then passing the grouting pipe through the connecting hole, and then passing the grouting pipe through the protective pipe and out of the contact seat. At this time, the grouting pipe is fixedly connected with the protective pipe, and the adjusting seat is rotated so that the adjusting seat rotates along the threaded rod, driving the connecting rod and the contact seat to move. At this time, the distance between the contact seat and the connecting seat changes, which is convenient for adjusting the pressure of the grouting liquid on the contact seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the internal structure of the casing of the present invention;

[0031] Figure 3 This is a schematic diagram of the connection of the installation unit of the present invention;

[0032] Figure 4 This is a schematic diagram of the connection between the contact unit and the pressure unit of the present invention;

[0033] Figure 5 It is an enlarged view of the partial structure of the contact unit of the present invention;

[0034] Figure 6 It is a schematic diagram of the structure of the pressure unit of the present invention;

[0035] Figure 7 It is an enlarged view of the partial structure of the pressure unit of the present invention.

[0036] In the figure: 1. main frame; 2. drill pipe; 3. casing; 4. mounting unit; 401. mounting frame; 402. fixing rod; 403. connecting hole; 5. contact unit; 501. contact seat; 502. connecting seat; 503. protective tube; 504. connecting rod; 505. threaded rod; 506. adjusting seat; 507. linkage seat; 6. pressure unit; 601. rotating seat; 602. rotating rod; 603. moving seat; 604. sliding rod; 605. mounting seat; 606. spring; 607. guide seat; 7. extrusion seat. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The embodiment of the present application provides a backward segmented grouting equipment and a method for using the equipment, which solves the problem of controlling the grouting pressure of an area by artificial control, and driving the grouting pipe to move by the drill rod 2. The equipment mainly relies on artificial judgment and grouting rate, and requires high artificial proficiency. When misjudgment occurs, incomplete grouting and excessive pressure may easily lead to structural damage, resulting in poor bearing capacity. When the extrusion seat 7 is in the casing 3, the spring 606 rebounds and pushes the extrusion seat 7 to contact and extrude the casing 3, and the pressure is appropriate. When the grouting liquid is gradually grouted, the grouting liquid contacts the contact seat 501, and a pressure is generated on the contact seat 501. When the extrusion force between the extrusion seat 7 and the casing 3 is reduced to a specified force, the pressure of the contact seat 501 and the grouting liquid pushes the connecting seat 502 to move, so that the connecting seat 502 drives the fixing rod 402 and the mounting frame 401 to move, reduces the pressure of the grouting liquid on the contact seat 501, limits the pressure in the casing 3 to a suitable range, and avoids the occurrence of excessive or low pressure.

[0039] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] The embodiment of the invention discloses a backward segmented grouting device and a use method thereof.

[0041] According to the attached Figure 1-7 As shown, it includes a main frame 1, a drill rod 2 and a casing 3. The drill rod 2 is connected to the end of the main frame 1, and the drill rod 2 is inserted into the casing 3. The main frame 1 drives the drill rod 2 to move so that the drill rod 2 is inside the casing 3. The casing 3 is provided with a mounting unit 4, a contact unit 5 and a pressure unit 6. The end of the drill rod 2 is connected to the mounting unit 4, and the mounting unit 4 and the pressure unit 6 are located above the contact unit 5.

[0042] The mounting unit 4 includes a mounting frame 401 fixedly connected to the end of the drill pipe 2, and a plurality of fixing rods 402 are fixedly connected to the bottom end surface of the mounting frame 401;

[0043] The contact unit 5 includes a connecting seat 502 fixedly connected to the ends of a plurality of fixing rods 402, and a contact seat 501 is arranged below the connecting seat 502. By fixing the drill rod 2 with the mounting frame 401, and then passing the grouting pipe through the connecting hole 403, and then passing the grouting pipe through the protective pipe 503 and out of the contact seat 501, at this time, by fixing the grouting pipe with the protective pipe 503, by rotating the adjusting seat 506, the adjusting seat 506 is rotated along the threaded rod 505, driving the connecting rod 504 and the contact seat 501 to move, at this time, the distance between the contact seat 501 and the connecting seat 502 changes, so as to facilitate the adjustment of the pressure of the grouting liquid on the contact seat 501;

[0044] The pressure unit 6 includes a sliding rod 604 slidably connected to the connecting seat 502, and the end of the sliding rod 604 is fixedly connected to the mounting seat 605, and the top of the mounting seat 605 is connected to the extrusion seat 7 by bolts. When the extrusion seat 7 is in the casing 3, under the rebound of the spring 606, the extrusion seat 7 is pushed to contact and squeeze the casing 3, and is at a suitable pressure. When the grouting liquid is gradually grouted, the grouting liquid contacts the contact seat 501, and a pressure is generated on the contact seat 501. When the extrusion force between the extrusion seat 7 and the casing 3 is reduced to a specified force, at this time, the pressure of the contact seat 501 and the grouting liquid pushes the connecting seat 502 to move, so that the connecting seat 502 drives the fixed rod 402 and the mounting frame 401 to move, reducing the pressure of the grouting liquid on the contact seat 501, limiting the pressure in the casing 3 to be within a suitable range, and avoiding the occurrence of excessive or low pressure.

[0045] The mounting frame 401 is provided with a plurality of connection holes 403 , and a plurality of grouting pipes are connected to the interior of the connection holes 403 . When grouting is performed, the drill rod 2 is first fixedly connected to the mounting frame 401 , and then the grouting pipes are passed through the connection holes 403 .

[0046] A protective tube 503 is provided directly below the multiple grouting pipes on the connecting hole 403. The protective tube 503 is fixedly connected to the inner walls of the contact seat 501 and the connecting seat 502. The grouting pipe is passed through the protective tube 503 and out of the contact seat 501. At this time, the grouting pipe is fixedly connected to the protective tube 503, and the adjusting seat 506 is rotated so that the adjusting seat 506 rotates along the threaded rod 505, driving the connecting rod 504 and the contact seat 501 to move. At this time, the distance between the contact seat 501 and the connecting seat 502 changes, which is convenient for adjusting the pressure of the grouting liquid on the contact seat 501.

[0047] A linkage seat 507 is slidably connected to the inner wall of the connecting seat 502, and a threaded rod 505 is fixedly connected to the bottom end face of the linkage seat 507. A connecting rod 504 is slidably connected to the outer peripheral wall of the threaded rod 505. The connecting rod 504 is fixedly connected to the top end face of the contact seat 501, and grouting is performed on the bottom end of the grouting section through a grouting pipe. At this time, the grouting liquid is discharged from the grouting pipe, so that the grouting liquid is below the contact seat 501. When the grouting liquid is gradually grouted, the grouting liquid contacts the contact seat 501, and a pressure is generated on the contact seat 501, pushing the contact seat 501 to move. At this time, the contact seat 501 slides along the outer peripheral wall of the protective tube 503, so that the connecting rod 504, the threaded rod 505 and the linkage seat 507 move along the inner wall of the connecting seat 502.

[0048] An adjusting seat 506 is threadedly connected to the outer peripheral wall of the threaded rod 505 , and the adjusting seat 506 is rotatably connected to the connecting rod 504 .

[0049] The outer peripheral wall of the linkage seat 507 is fixedly connected with a rotating seat 601, and the inner wall of the rotating seat 601 is rotatably connected with a plurality of rotating rods 602, and the other end of the rotating rod 602 is rotatably connected with a moving seat 603, and the moving seat 603 is fixedly connected with the corresponding sliding rod 604;

[0050] Under the movement of the linkage seat 507, the linkage seat 507 drives the rotating seat 601 to move, so that the rotating seat 601 drives the plurality of rotating rods 602 to rotate, and at this time the rotating rods 602 pull the moving seat 603 to move, so that the moving seat 603 drives the sliding rod 604 to slide along the guide seat 607, so that the sliding rod 604 drives the mounting seat 605 and the extruding seat 7 to move, and under the movement of the mounting seat 605, the mounting seat 605 compresses the spring 606, so that the spring 606 is compressed between the mounting seat 605 and the guide seat 607;

[0051] The extrusion pressure between the extrusion seat 7 and the inner wall of the casing 3 gradually decreases. When the extrusion pressure between the extrusion seat 7 and the casing 3 is reduced to a specified force, the pressure of the contact seat 501 and the grouting liquid pushes the connecting seat 502 to move, so that the connecting seat 502 drives the fixing rod 402 and the mounting frame 401 to move, reducing the pressure of the grouting liquid on the contact seat 501, and limiting the pressure in the casing 3 to a suitable range.

[0052] The outer peripheral wall of the sliding rod 604 is sleeved with a spring 606, one side of the spring 606 is fixedly connected to the mounting seat 605, and the other side of the spring 606 is fixedly connected to the guide seat 607. When the extrusion seat 7 is in the casing 3, the extrusion seat 7 and the mounting seat 605 are moved by adjusting the extrusion seat 7, so that the positions of the extrusion seat 7 and the mounting seat 605 are adjusted. When the extrusion seat 7 moves, the mounting seat 605 and the sliding rod 604 are driven to move, so that the mounting seat 605 compresses the spring 606. Under the rebound of the spring 606, the extrusion seat 7 is pushed to contact and extrude the casing 3, and is at a suitable pressure.

[0053] The guide seat 607 is fixedly connected to the top end surface of the connecting seat 502, and the guide seat 607 is slidably connected with the sliding rod 604. When the connecting seat 502 moves, the distance between the connecting seat 502 and the contact seat 501 changes. At this time, the connecting rod 504, the threaded rod 505 and the linkage seat 507 move relative to the connecting seat 502, so that the connecting seat 502 drives the rotating rod 602 to rotate, so that the guide seat 607 moves. At this time, under the rebound of the spring 606, the mounting seat 605 and the extrusion seat 7 are driven to move, so that the extrusion seat 7 contacts the inner wall of the casing 3;

[0054] At this time, under the extrusion of the extrusion seat 7 and the casing 3, a reverse pressure is applied to the connecting seat 502 and the contact seat 501. At this time, the contact seat 501 applies pressure to the injection slurry to ensure the grouting effect. At the same time, under the movement of the connecting seat 502, the protective pipe 503 and the injection pipe are moved, which is convenient for continuous grouting and continuous pulling out of the grouting pipe to gradually form grouting holes. It is suitable for geological conditions where holes are difficult to form, such as hard rock formations and compacted soil formations, to ensure the injection effect. By continuously grouting in sections and withdrawing the grouting pipe, it is ensured that the grouting slurry can fully fill and reinforce the formation.

[0055] Working principle: When grouting is required in the grouting hole, first grouting is carried out on a grouting section at the bottom. After grouting a certain distance, the grouting pipe is pulled back for a certain distance, and then grouting is continued. This cycle is repeated until the grouting operation of the entire grouting hole is completed.

[0056] When grouting is performed, first, the drill rod 2 is fixedly connected to the mounting frame 401, and then the grouting pipe is passed through the connecting hole 403, and then the grouting pipe is passed through the protective tube 503 and out of the contact seat 501. At this time, the grouting pipe is fixedly connected to the protective tube 503, and the adjusting seat 506 is rotated so that the adjusting seat 506 rotates along the threaded rod 505, driving the connecting rod 504 and the contact seat 501 to move. At this time, the distance between the contact seat 501 and the connecting seat 502 changes, which is convenient for adjusting the pressure of the grouting liquid on the contact seat 501.

[0057] Then, the mounting frame 401, the contact seat 501 and the connecting seat 502 are driven by the drill rod 2 to move downward to the bottom end of the grouting section. When the extrusion seat 7 is in the casing 3, the extrusion seat 7 and the mounting seat 605 are adjusted to move, so that the positions of the extrusion seat 7 and the mounting seat 605 are adjusted. Under the movement of the extrusion seat 7, the mounting seat 605 and the sliding rod 604 are driven to move, so that the mounting seat 605 compresses the spring 606. Under the rebound of the spring 606, the extrusion seat 7 is pushed to contact and squeeze the casing 3 to be at a suitable pressure.

[0058] At this time, grouting is performed on the bottom end of the grouting section through the grouting pipe. At this time, the grouting liquid is discharged from the grouting pipe, so that the grouting liquid is below the contact seat 501. When the grouting liquid is gradually grouting, the grouting liquid contacts the contact seat 501, and a pressure is generated on the contact seat 501, pushing the contact seat 501 to move. At this time, the contact seat 501 slides along the outer peripheral wall of the protection tube 503, so that the connecting rod 504, the threaded rod 505 and the linkage seat 507 move along the inner wall of the connecting seat 502;

[0059] Under the movement of the linkage seat 507, the linkage seat 507 drives the rotating seat 601 to move, so that the rotating seat 601 drives the plurality of rotating rods 602 to rotate, and at this time the rotating rods 602 pull the moving seat 603 to move, so that the moving seat 603 drives the sliding rod 604 to slide along the guide seat 607, so that the sliding rod 604 drives the mounting seat 605 and the extruding seat 7 to move, and under the movement of the mounting seat 605, the mounting seat 605 compresses the spring 606, so that the spring 606 is compressed between the mounting seat 605 and the guide seat 607;

[0060] At this time, the extrusion pressure between the extrusion seat 7 and the inner wall of the casing 3 gradually decreases. When the extrusion pressure between the extrusion seat 7 and the casing 3 decreases to a specified force, the pressure of the contact seat 501 and the grouting liquid pushes the connecting seat 502 to move, so that the connecting seat 502 drives the fixing rod 402 and the mounting frame 401 to move, reducing the pressure of the grouting liquid on the contact seat 501, and limiting the pressure in the casing 3 to be within a suitable range;

[0061] When the connecting seat 502 moves, the distance between the connecting seat 502 and the contact seat 501 changes. At this time, the connecting rod 504, the threaded rod 505 and the linkage seat 507 move relative to the connecting seat 502, so that the connecting seat 502 drives the rotating rod 602 to rotate, so that the guide seat 607 moves. At this time, under the rebound of the spring 606, the mounting seat 605 and the extrusion seat 7 are driven to move, so that the extrusion seat 7 contacts the inner wall of the casing 3;

[0062] At this time, under the extrusion of the extrusion seat 7 and the casing 3, a reverse pressure is applied to the connecting seat 502 and the contact seat 501. At this time, the contact seat 501 applies pressure to the injection slurry to ensure the grouting effect. At the same time, under the movement of the connecting seat 502, the protective pipe 503 and the injection pipe are moved, which is convenient for continuous grouting and continuous pulling out of the grouting pipe to gradually form grouting holes. It is suitable for geological conditions where holes are difficult to form, such as hard rock formations and compacted soil formations, to ensure the injection effect. By continuously grouting in sections and withdrawing the grouting pipe, it is ensured that the grouting slurry can fully fill and reinforce the formation.

[0063] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A backward staged grouting equipment, characterized in that: The invention comprises a main frame (1), a drill rod (2) and a casing (3), wherein the drill rod (2) is connected to the end of the main frame (1), the drill rod (2) is inserted into the casing (3), the casing (3) is provided with a mounting unit (4), a contact unit (5) and a pressure unit (6), the end of the drill rod (2) is connected to the mounting unit (4), the mounting unit (4) and the pressure unit (6) are located above the contact unit (5), The mounting unit (4) comprises a mounting frame (401) fixedly connected to the end of the drill rod (2), and a plurality of fixing rods (402) are fixedly connected to the bottom end surface of the mounting frame (401); The contact unit (5) comprises a connection seat (502) fixedly connected to the ends of a plurality of fixing rods (402), and a contact seat (501) is arranged below the connection seat (502); The pressure unit (6) comprises a sliding rod (604) slidably connected to the connecting seat (502), the end of the sliding rod (604) is fixedly connected to a mounting seat (605), and an extrusion seat (7) is connected above the mounting seat (605) via bolts.

2. The backward staged grouting equipment according to claim 1, characterized in that: The mounting frame (401) is provided with a plurality of connection holes (403), and a plurality of grouting pipes are connected inside the connection holes (403).

3. The backward staged grouting equipment according to claim 2, characterized in that: A protection pipe (503) is provided directly below the plurality of grouting pipes on the connection hole (403), and the protection pipe (503) is fixedly connected to the inner walls of the contact seat (501) and the connection seat (502).

4. The backward staged grouting equipment according to claim 3, characterized in that: A linkage seat (507) is slidably connected to the inner wall of the connection seat (502), a threaded rod (505) is fixedly connected to the bottom end face of the linkage seat (507), a connecting rod (504) is slidably connected to the outer peripheral wall of the threaded rod (505), and the connecting rod (504) is fixedly connected to the top end face of the contact seat (501).

5. The backward staged grouting equipment according to claim 4, characterized in that: The outer peripheral wall of the threaded rod (505) is threadedly connected with an adjustment seat (506), and the adjustment seat (506) is rotatably connected to the connecting rod (504).

6. The backward staged grouting equipment according to claim 5, characterized in that: The outer peripheral wall of the linkage seat (507) is fixedly connected to a rotating seat (601), and a plurality of rotating rods (602) are rotatably connected to the inner wall of the rotating seat (601). The other end of the rotating rod (602) is rotatably connected to a moving seat (603), and the moving seat (603) is fixedly connected to the corresponding sliding rod (604).

7. The backward staged grouting equipment according to claim 6, characterized in that: A spring (606) is sleeved on the outer peripheral wall of the sliding rod (604), one side of the spring (606) is fixedly connected to the mounting seat (605), and the other side of the spring (606) is fixedly connected to the guide seat (607).

8. The backward staged grouting equipment according to claim 7, characterized in that: The guide seat (607) is fixedly connected to the top end surface of the connecting seat (502), and the guide seat (607) is slidably connected to the sliding rod (604).

9. A method for using the backward segmented grouting equipment according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: The drill rod (2) is fixedly connected to the mounting frame (401), and then the grouting pipe is passed through the connecting hole (403), and then the grouting pipe is passed through the protective pipe (503) and out of the contact seat (501). At this time, the grouting pipe is fixedly connected to the protective pipe (503), and grouting is first performed on a grouting section at the bottom through the grouting pipe. After grouting a certain distance, the grouting pipe is pulled back a certain distance, and grouting is continued, and the cycle is repeated until the grouting operation of the entire grouting hole is completed; S2: At this time, the grouting liquid is discharged from the grouting pipe, so that the grouting liquid is located below the contact seat (501). The grouting liquid contacts the contact seat (501), pushing the contact seat (501) to move, so that the linkage seat (507) moves, driving the rotating seat (601) to move, driving the multiple rotating rods (602) to rotate, and at this time the rotating rod (602) pulls the moving seat (603) to move, so that the sliding rod (604) drives the mounting seat (605) and the extrusion seat (7) to move. Under the movement of the mounting seat (605), the mounting seat (605) compresses the spring (606), so that the spring (606) is compressed between the mounting seat (605) and the guide seat (607); S3: At this time, the squeezing force between the squeezing seat (7) and the inner wall of the casing (3) gradually decreases. When the squeezing force between the squeezing seat (7) and the casing (3) decreases to a specified force, the pressure of the contact seat (501) and the grouting liquid pushes the connecting seat (502) to move, so that the connecting seat (502) drives the fixing rod (402) and the mounting frame (401) to move, reducing the pressure of the grouting liquid on the contact seat (501), and limiting the pressure in the casing (3) to a suitable range; S4: When the connecting seat (502) moves, the distance between the connecting seat (502) and the contact seat (501) changes. At this time, the connecting rod (504), the threaded rod (505) and the linkage seat (507) move relative to the connecting seat (502), so that the connecting seat (502) drives the rotating rod (602) to rotate, so that the guide seat (607) moves. At this time, under the rebound of the spring (606), the mounting seat (605) and the extrusion seat (7) are driven to move, so that the extrusion seat (7) contacts the inner wall of the casing (3); S5: Under the extrusion of the extrusion seat (7) and the casing (3), a reverse pressure is applied to the connecting seat (502) and the contact seat (501). At this time, the contact seat (501) applies pressure to the injection slurry to ensure the grouting effect. At the same time, under the movement of the connecting seat (502), the protective pipe (503) and the injection pipe are moved, which is convenient for continuous grouting and continuous pulling out of the grouting pipe to gradually form grouting holes. It is suitable for geological conditions where it is difficult to form holes, such as hard rock layers and compacted soil layers, to ensure the grouting effect. By continuously grouting in sections and withdrawing the grouting pipe, it is ensured that the grouting slurry can fully fill and reinforce the formation.

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