A corrosion-resistant high-pressure jet grouting drill pipe for soil remediation

Abstract

The present invention relates to the technical field of soil remediation equipment, and provides a corrosion-resistant high-pressure jet grouting drill pipe for soil remediation, which includes a connection head, a slurry pipe, an outer sleeve pipe, a jet head and a drill bit. The connection head has a slurry inlet hole, an air chamber and a first air inlet hole. The slurry pipe and the outer sleeve pipe are rotatably connected to the connection head. The corrosion-resistant connection assembly is further included, and the corrosion-resistant connection assembly is arranged in the slurry inlet hole. The slurry pipe penetrates into the air chamber, and the corrosion-resistant connection assembly is communicated with the slurry pipe. The jet head is integrally connected with the drill bit. The jet head is a corrosion-resistant part, and the drill bit is made of carbon steel. Through the above technical solution, the problem that the high-pressure jet grouting drill pipe in the prior art is prone to corrosion and difficult to maintain continuous high pressure is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation equipment, and more specifically, to a corrosion-resistant high-pressure jet grouting drill pipe for soil remediation. Background Art

[0002] In recent years, soil remediation has been emphasized with the reuse of land. Generally, there are two ways to remediate soil. One is to remove the soil from the polluted area, carry out remediation operations on the soil, and then backfill it after the remediation is completed, which is called ex-situ remediation. The other is to drive the drill pipe into the ground through a drill rig. According to the pollution situation of the soil, corresponding remediation positions are designed on the ground. When the drill pipe is driven into the ground, a remediation liquid medicine will be jet grouted into the soil through the drill pipe, thereby playing a role in remediating the soil. This is in-situ remediation. In-situ remediation can reduce a large amount of labor costs compared with ex-situ remediation, but it has higher requirements for the coverage of the jet grouted liquid medicine.

[0003] Currently, when dealing with organic pollution in soil, sodium persulfate with strong oxidizing property is required. However, sodium persulfate will corrode the components in the drill pipe, making it difficult to ensure jet grouting under high pressure. Then, when the drill pipe is driven into the ground, the coverage range will become smaller accordingly, and the effect of in-situ soil remediation will be greatly reduced. In addition, when the corroded drill pipe can no longer meet the remediation requirements, it needs to be replaced and repaired. The replacement cycle is long, which delays work efficiency and the cost is also high. Based on the above problems, there is an urgent need for a corrosion-resistant high-pressure jet grouting drill pipe. Summary of the Invention

[0004] The present invention provides a corrosion-resistant high-pressure jet grouting drill pipe for soil remediation, which solves the problem that the high-pressure jet grouting drill pipe in the prior art is easily corroded and difficult to maintain continuous high pressure.

[0005] The technical solution of the present invention is as follows:

[0006] A corrosion-resistant high-pressure jet grouting drill pipe for soil remediation includes a connector, a slurry pipe, an outer sleeve pipe, a jet head and a drill bit. The connector has a slurry inlet hole, an air chamber and a first air inlet hole. The slurry pipe and the outer sleeve pipe are rotatably connected to the connector. It also includes a corrosion-resistant connection assembly, which is arranged in the slurry inlet hole. The slurry pipe penetrates into the air chamber, and the corrosion-resistant connection assembly is communicated with the slurry pipe. The jet head is integrally connected to the drill bit. The jet head is a corrosion-resistant part, and the drill bit is made of carbon steel.

[0007] The corrosion-resistant connection assembly is a stainless steel cylinder, one end of which extends into the slurry inlet hole, and the other end is communicated with the slurry pipe. There are several slurry pipes, and adjacent slurry pipes are connected through a quick-insert structure.

[0008] There are several outer sleeve pipes, and adjacent outer sleeve pipes are connected by means of threads.

[0009] One end of the slurry pipe is a male head and the other end is a female head. The radius of the male head end of the slurry pipe is smaller than that of the female head end. The male head end of the slurry pipe is inserted into the female head end of the adjacent slurry pipe.

[0010] A number of positioning ribs along the axial direction of the slurry pipe are arranged on the circumference of one end of the male head of the slurry pipe, and a number of positioning grooves matching with the positioning ribs are arranged on the inner wall of one end of the female head of the slurry pipe.

[0011] The spray head has a spray orifice, a second air inlet hole and a pressurizing chamber. An air inlet space is formed between the outer sleeve pipe and the slurry pipe. The first air inlet hole communicates with the upper end of the air inlet space. The second air inlet hole communicates with the lower end of the air inlet space. The second air inlet hole communicates with the pressurizing chamber. The spray orifices are a number of, arranged on the side surface of the spray head in a circumferential manner. The spray orifices communicate with the pressurizing chamber.

[0012] It further includes an intermittent blocking disc arranged in the pressurizing chamber and a connecting rod arranged in the slurry pipe. One end of the connecting rod is connected to the connecting head, and the other end of the connecting rod is connected to the intermittent blocking disc. Spray notches are circumferentially formed on the edge of the intermittent blocking disc.

[0013] The number of the connecting rods is a number of, and adjacent connecting rods are connected by means of threads.

[0014] The outer sleeve pipe includes a carbon steel cylinder and a PE layer arranged in the carbon steel cylinder.

[0015] The working principle and beneficial effects of the present invention are as follows:

[0016] In the present invention, a corrosion-resistant high-pressure rotary jet drill rod for soil remediation is disclosed. By transforming the upper and lower ends of the drill rod, that is, the slurry pipe, the connection assembly of the slurry pipe and the spray head inside the connecting head, it can always ensure that the drill rod maintains continuous high-pressure rotary jet, and will not cause pressure loss due to corrosion. Among them, the slurry pipe is made of corrosion-resistant stainless steel, and a corrosion-resistant connection structure, that is, a corrosion-resistant connection assembly, is also adopted between the slurry pipe and the connecting head. In this way, it can ensure that the repair fluid entering the drill rod remains continuous. When the repair fluid is ejected from the spray head, this is also very important because it is necessary to make the drill rod maintain efficient rotary jet within its central range, so as to keep its complete coverage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0018] Figure 1 It is a schematic diagram of the drill rod structure of the present invention;

[0019] Figure 2 For Figure 1Partial enlarged view of location A

[0020] Figure 3 Schematic structural diagram of the slurry pipe of the present invention

[0021] In the figure: 1, connector; 2, slurry pipe; 3, outer sleeve; 4, injection head; 5, drill bit; 6, slurry inlet hole; 7, air chamber; 8, first air inlet hole; 9, corrosion-resistant connection assembly; 10, positioning rib; 11, positioning groove; 12, injection port; 13, second air inlet hole; 14, pressurization chamber; 15, intermittent plugging disc; 16, connecting rod; 17, injection notch; 18, carbon steel cylinder; 19, PE layer. Specific embodiments

[0022] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present invention.

[0023] As Figures 1 to 3 shown, this embodiment provides a corrosion-resistant high-pressure rotary jet drill rod for soil remediation, including a connector 1, a slurry pipe 2, an outer sleeve 3, an injection head 4 and a drill bit 5. The connector 1 has a slurry inlet hole 6, an air chamber 7 and a first air inlet hole 8. The slurry pipe 2 and the outer sleeve 3 are rotatably connected to the connector 1. It also includes a corrosion-resistant connection assembly 9, which is arranged in the slurry inlet hole 6. The slurry pipe 2 penetrates into the air chamber 7. The corrosion-resistant connection assembly 9 is communicated with the slurry pipe 2. The injection head 4 is integrally connected to the drill bit 5. The injection head 4 is a corrosion-resistant part, and the drill bit 5 is made of carbon steel.

[0024] In this embodiment, the structural main body of the corrosion-resistant high-pressure rotary jet drill rod is composed of two layers inside and outside. The internal slurry pipe 2 transports the repair fluid, and the outer sleeve 3 is paired with the injection head 4 and the drill bit 5 for drilling operations. The slurry inlet hole 6 on the connector 1 is connected to the external pipeline for transporting the repair fluid. The corrosion-resistant connection assembly is inserted into the slurry inlet hole 6 and is connected and sealed through a sealing ring. The air chamber 7 is the first space for transporting the external high-pressure gas. From the air chamber 7, it enters between the outer sleeve 3 and the slurry pipe 2 through the first air inlet hole 8. The slurry pipe 2 transports the repair fluid to the injection head 4. At the same time, the high-pressure gas also reaches the injection head 4. Under the action of the high-pressure gas, the repair fluid will be ejected from the injection head 4 to repair the soil. The injection head 4 needs to maintain a standard ejection space size to always maintain a certain injection range under the action of pressure. Therefore, the injection head 4 is also made of a corrosion-resistant part and is integrated with the drill bit 5. The drill bit 5 does not need to be replaced due to the corrosion of the connecting part, thereby further improving the overall corrosion resistance of the drill rod to maintain continuous high-pressure rotary jetting.

[0025] The corrosion-resistant connection assembly 9 is a stainless-steel cylinder, one end of which extends into the slurry inlet hole 6, and the other end is communicated with the slurry pipe 2. There are several slurry pipes 2, and adjacent slurry pipes 2 are connected by a quick-insert structure.

[0026] In this embodiment, the corrosion-resistant connection assembly 9 adopts a stainless-steel cylinder and is connected to the slurry pipe 2. As the repair depth increases, when the slurry pipe 2 is connected in multiple sections, the quick-insert structure is very necessary.

[0027] There are several outer casing pipes 3, and adjacent outer casing pipes 3 are connected by means of threads.

[0028] In this embodiment, similar to the slurry pipe 2, several outer casing pipes 3 are also combined. Different outer casing pipes 3 are connected by threads, which can have stable strength during drilling. The modular connection of the above two also improves the convenience of on-site construction.

[0029] One end of the slurry pipe 2 is a male head and the other end is a female head. The radius of the male head end of the slurry pipe 2 is smaller than that of the female head end. The male head end of the slurry pipe 2 is inserted into the female head end of the adjacent slurry pipe 2.

[0030] In this embodiment, the slurry pipe 2 adopts a form of cooperation between a male head and a female head. The radius of the male head is smaller than that of the female head. One end of the male head is inserted into the female head to form a connection.

[0031] Several positioning ribs 10 along the axial direction of the slurry pipe 2 are circumferentially arranged at one end of the male head of the slurry pipe 2, and several positioning grooves 11 matching with the positioning ribs 10 are arranged on the inner wall of one end of the female head of the slurry pipe 2.

[0032] In this embodiment, the connection of the slurry pipe 2 needs to bear the force brought by rotation. Therefore, several positioning ribs 10 are circumferentially arranged at one end of the male head. The direction of the positioning ribs 10 is along the axial direction of the slurry pipe 2. On the inner wall of the female head of the slurry pipe 2, positioning grooves 11 matching with the positioning ribs 10 are arranged, so as to realize the circumferential acting force brought when the slurry pipe 2 rotates with the drill bit 5.

[0033] The injection head 4 has injection ports 12, second air inlet holes 13 and a pressurization chamber 14. An air inlet space is formed between the outer casing pipe 3 and the slurry pipe 2. The first air inlet hole 8 is communicated with the upper end of the air inlet space. The second air inlet hole 13 is communicated with the lower end of the air inlet space. The second air inlet hole 13 is communicated with the pressurization chamber 14. There are several injection ports 12, which are circumferentially arranged on the side surface of the injection head 4. The injection ports 12 are communicated with the pressurization chamber 14.

[0034] In this embodiment, the pressurizing chamber 14 on the injection head 4 is the main place for ejecting the repair liquid. High-pressure gas will merge with the repair liquid in the pressurizing chamber 14 and eject it from the injection port 12. The high-pressure gas introduces the gas in the intake space into the pressurizing chamber 14 through the second intake hole 13. The rotating injection head 4 plus high-pressure injection can greatly improve the soil repair efficiency.

[0035] It further includes an intermittent plugging disk 15 arranged in the pressurizing chamber 14 and a connecting rod 16 arranged in the slurry pipe 2. One end of the connecting rod 16 is connected to the connecting head 1, and the other end of the connecting rod 16 is connected to the intermittent plugging disk 15. Injection notches 17 are circumferentially formed on the edge of the intermittent plugging disk 15.

[0036] In this embodiment, an intermittent plugging disk 15 is installed in the pressurizing chamber 14. The intermittent plugging disk 15 is connected to the connecting head 1 by means of a connecting rod 16. The connecting rod is fixed in the pipe of the connecting head 1 by means of a transverse support rod, which can fix and allow the repair liquid to pass through at the same time. The intermittent plugging disk 15 will block the injection port 12, but injection notches 17 are circumferentially formed on the periphery of the intermittent plugging disk 15. When the injection head 4 rotates, the injection port 12 and the injection notches 17 will be alternately communicated, so that each injection of the liquid medicine will be very powerful, further improving the coverage effect and strength of the injection.

[0037] There are several connecting rods 16, and adjacent connecting rods 16 are connected by threads.

[0038] In this embodiment, the connecting rod 16 also adopts a modular combined connection, which is convenient for connection and replacement.

[0039] The outer sleeve 3 includes a carbon steel cylinder 18 and a PE layer 19 arranged in the carbon steel cylinder 18.

[0040] In this embodiment, the outer sleeve is formed by combining a carbon steel cylinder 18 and a PE layer 19. The PE layer 19 can play an anti-corrosion effect, while the carbon steel cylinder 18 can maintain the required strength.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A corrosion-resistant high-pressure jet grouting drill pipe for soil remediation, comprising a connector (1), a slurry pipe (2), an outer casing (3), a jet head (4) and a drill bit (5). The connector (1) has a slurry inlet hole (6), an air chamber (7) and a first air inlet hole (8). The slurry pipe (2) and the outer casing (3) are rotatably connected to the connector (1), characterized in that, It further includes a corrosion-resistant connection assembly (9). The corrosion-resistant connection assembly (9) is arranged in the slurry inlet hole (6). The slurry pipe (2) penetrates into the air chamber (7). The corrosion-resistant connection assembly (9) is communicated with the slurry pipe (2). The injection head (4) is integrally connected with the drill bit (5). The injection head (4) is a corrosion-resistant part, and the drill bit (5) is made of carbon steel; The injection head (4) has injection ports (12), second air inlet holes (13) and a pressurization chamber (14). An air inlet space is formed between the outer sleeve pipe (3) and the slurry pipe (2). The first air inlet hole (8) is communicated with the upper end of the air inlet space. The second air inlet hole (13) is communicated with the lower end of the air inlet space. The second air inlet hole (13) is communicated with the pressurization chamber (14). The injection ports (12) are several and are circumferentially arranged on the side surface of the injection head (4). The injection ports (12) are communicated with the pressurization chamber (14); It further includes an intermittent plugging disc (15) arranged in the pressurization chamber (14) and a connecting rod (16) arranged in the slurry pipe (2). One end of the connecting rod (16) is connected with the connecting head (1), and the other end of the connecting rod (16) is connected with the intermittent plugging disc (15). Injection notches (17) are circumferentially formed on the edge of the intermittent plugging disc (15). When the injection head (4) rotates, the injection ports (12) and the injection notches (17) will be alternately communicated.

2. The corrosion-resistant high-pressure jet grouting drill pipe for soil remediation according to claim 1, wherein The corrosion-resistant connection assembly (9) is a stainless steel cylinder. One end extends into the slurry inlet hole (6), and the other end is communicated with the slurry pipe (2). There are several slurry pipes (2), and adjacent slurry pipes (2) are connected through a quick-insert structure.

3. The corrosion-resistant high-pressure jet grouting drill pipe for soil remediation according to claim 2, characterized in that, There are several outer sleeve pipes (3), and adjacent outer sleeve pipes (3) are connected by means of threads.

4. The corrosion-resistant high-pressure jet grouting drill pipe for soil remediation according to claim 2, characterized in that, One end of the slurry pipe (2) is a male head and the other end is a female head. The radius of the male head end of the slurry pipe (2) is smaller than that of the female head end. The male head end of the slurry pipe (2) is inserted into the female head end of the adjacent slurry pipe (2).

5. The corrosion-resistant high-pressure jet grouting drill pipe for soil remediation according to claim 4, characterized in that, Several positioning ribs (10) along the axial direction of the slurry pipe (2) are circumferentially arranged at the male head end of the slurry pipe (2), and several positioning grooves (11) matching with the positioning ribs (10) are arranged on the inner wall of the female head end of the slurry pipe (2).

6. The corrosion-resistant high-pressure jet grouting drill pipe for soil remediation according to claim 1, wherein, There are several connecting rods (16), and adjacent connecting rods (16) are connected by means of threads.

7. The corrosion-resistant high-pressure jet grouting drill pipe for soil remediation according to claim 1, characterized in that, The outer sleeve pipe (3) includes a carbon steel cylinder (18) and a PE layer (19) arranged in the carbon steel cylinder (18).

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