Integrated high-pressure stirring and spraying drilling tool for in-situ soil remediation

Abstract

The integrated high-pressure stirring and spraying drilling tool for in-situ soil remediation aims at solving the problems that a traditional stirring and spraying drilling tool needs hole guiding operation in deep contaminated soil in-situ remediation construction, efficiency is low, and secondary pollution is prone to being caused on a construction site. The auger blade at the lower end adopts a cavity type design, hole guiding can be implemented in the stirring and spraying operation process, meanwhile, the nozzle is arranged at the edge of the auger blade, and the nozzle injects an agent in the hole guiding process, so that the stirring and spraying operation on the polluted soil in the hole guiding process is realized, and a hole guiding drill rod does not need to be replaced additionally for operation; the in-situ soil remediation stirring and spraying operation efficiency is improved, a stirring and spraying agent pipeline and a nozzle are improved, a powder agent and a liquid agent are injected at the same time, atomization and even mixing of the liquid agent are achieved in the injection process, and the situation that the agents are stirred unevenly in the stirring and spraying process is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of in-situ soil oxidation remediation technology, specifically relating to an integrated in-situ soil remediation high-pressure stirring jet drilling tool. Background Technology

[0002] Originally used in building foundation treatment, jet grouting tools have recently been modified for in-situ remediation of deeply contaminated soils due to the expanding scale of contaminated soil remediation. Combined with high-pressure back-end grouting equipment, the remediation agent can be carried into the contaminated layer along with the drill bit. Under the cutting action of the high-pressure injected agent and the stirring action of the jet grouting bit, it reacts with the pollutants in the contaminated soil, thus achieving the goal of in-situ remediation. However, in practical engineering applications, the modified drill bits still have the following shortcomings in in-situ remediation of contaminated soil:

[0003] 1. Traditional jet grouting drills do not have auger blades. When encountering clay in the process of remediating contaminated soil in deeper strata, the jet grouting drill bit has difficulty reaching the target depth. The drill bit and drive system are under considerable strain, and faults such as drill bit twisting and deformation, motor overheating and sudden stop often occur, resulting in low soil remediation efficiency.

[0004] 2. In some application scenarios, it is necessary to simultaneously inject grout and spray powdered agents into contaminated soil. Traditionally, the grouting and powder spraying drill bits are designed with independent nozzles, which can easily cause blockages during the injection and spraying process, and there may be uneven mixing of powdered agents.

[0005] 3. When encountering hard strata, traditional jet grouting drills need to be replaced with auger drills to carry out pilot hole operations, bringing the contaminated soil that originally needed to be jetted in situ to the surface. The contaminated soil in this pilot hole is disturbed, causing secondary pollution, and further treatment is required afterward. Utility Model Content

[0006] To address the aforementioned deficiencies or improvement needs of existing technologies, the purpose of this utility model is to provide an integrated high-pressure stirring and spraying drill for in-situ soil remediation. This solution addresses the problems of low efficiency and potential secondary pollution associated with traditional stirring and spraying drills used in deep contaminated soil remediation. The integrated drill bit and auger are combined into one unit, with the lower auger blades featuring a cavity design. This allows for simultaneous drilling during the stirring and spraying process. Nozzles are positioned on the edges of the auger blades, injecting chemicals during drilling. This enables simultaneous stirring and spraying of the contaminated soil during drilling, eliminating the need to replace the drill rod and improving the efficiency of in-situ soil remediation stirring and spraying operations. It also avoids uneven chemical mixing.

[0007] To achieve the above objectives, this utility model provides an integrated in-situ soil remediation high-pressure stirring and spraying drill bit, including a drive drill bit, an integrated high-pressure nozzle for slurry, a hollow auger blade, a high-pressure nozzle, a solid auger blade, a concentric high-pressure pipeline, and a drill rod.

[0008] Specifically, the present invention provides an integrated in-situ soil remediation high-pressure stirring and jetting drill, characterized in that it includes a drill rod and auger blades;

[0009] The drill rod has a high-pressure material pipeline running through the entire length of the drill rod inside its body.

[0010] The aforementioned auger blades are coiled around the outer surface of the drill pipe and include hollow auger blades;

[0011] The head end of the aforementioned hollow auger blade is close to the driving drill bit and has a hollow structure. Several high-pressure nozzles I are provided on it, and the high-pressure nozzles I are connected to the high-pressure material pipeline.

[0012] Furthermore, the integrated in-situ soil remediation high-pressure stirring and jetting drill provided by this utility model is characterized in that:

[0013] The aforementioned auger blades also include solid auger blades;

[0014] The aforementioned solid auger blades are connected to the ends of the hollow auger blades.

[0015] Furthermore, the integrated in-situ soil remediation high-pressure stirring and jetting drill provided by this utility model is characterized in that:

[0016] The wall thickness of the aforementioned hollow auger blades is 5-10 mm;

[0017] and / or

[0018] The spacing between the nozzles on the aforementioned cavity auger blades is 30-50cm.

[0019] Furthermore, the integrated in-situ soil remediation high-pressure stirring and jetting drill provided by this utility model is characterized in that:

[0020] The aforementioned high-pressure material pipeline has a double-layer casing structure, including an outer material pipeline and a central material pipeline;

[0021] The aforementioned central material pipeline is nested inside the outer material pipeline.

[0022] The high-pressure material pipeline forms a concentric high-pressure pipeline through a double-layer sleeve structure. This concentric high-pressure pipeline is used for the transmission of liquid and powdered agents during in-situ stirring and spraying.

[0023] The concentric high-pressure pipeline is equipped with branch lines, which are connected to the cavity auger blades and the integrated slurry high-pressure nozzle. The concentric high-pressure pipeline uses seamless steel pipes, and each section is connected by threads to ensure the independent transmission of powdered and liquid agents.

[0024] Furthermore, the integrated in-situ soil remediation high-pressure stirring and jetting drill provided by this utility model is characterized in that:

[0025] The aforementioned high-pressure nozzle I has a double-layer structure corresponding to the high-pressure material pipeline, which is respectively connected to the outlet of the outer material pipeline and the central material pipeline.

[0026] Generally, this high-pressure nozzle is an integrated, shared high-pressure nozzle for both powder and slurry applications. The outer edge sprays high-pressure powder, while the center sprays liquid. It is connected to a concentric high-pressure pipeline branching inside the drill pipe. Furthermore, each ring of the hollow auger blades is equipped with no fewer than four high-pressure nozzles for injecting chemicals into the soil that rises during the pilot hole operation, achieving a larger chemical diffusion radius.

[0027] Furthermore, the integrated in-situ soil remediation high-pressure stirring and jetting drill provided by this utility model is characterized in that:

[0028] It also includes a drive drill bit and multi-layer stirring blades;

[0029] The aforementioned drive drill bit is located at the head end of the drill rod; that is, the drive drill bit and the bottom end of the drill rod are connected by various methods such as welding, integral molding, screwing, and plugging. When it is a detachable installation method, the drive drill bit can be replaced when significant wear occurs during construction.

[0030] The aforementioned multi-layered stirring blades are arranged at a certain angle and in an axisymmetric manner on the driving drill bit.

[0031] Furthermore, the integrated in-situ soil remediation high-pressure stirring and jetting drill provided by this utility model is characterized in that:

[0032] The aforementioned multi-layered stirring blades are detachably mounted on the drive drill bit.

[0033] The number of mixing blades can be set according to the actual needs of use.

[0034] Furthermore, the integrated in-situ soil remediation high-pressure stirring and jetting drill provided by this utility model is characterized in that:

[0035] Each of the aforementioned multi-layered mixing blades is equipped with several toothed rakes.

[0036] Furthermore, the integrated in-situ soil remediation high-pressure stirring and jetting drill provided by this utility model is characterized in that:

[0037] The aforementioned rake is detachably mounted on the mixing blade.

[0038] The rake teeth are symmetrically distributed on the mixing blades, with at least three sets of rake teeth on the same side of the mixing blades. The rake teeth and the mixing blades are fixed at a certain angle. During the jet grouting drilling process, the rake teeth can cut the soil. In areas with harder strata, the number of rake teeth can be increased to achieve a stronger cutting effect.

[0039] Furthermore, the integrated in-situ soil remediation high-pressure stirring and jetting drill provided by this utility model is characterized in that:

[0040] The multilayered stirring blades described above have several high-pressure nozzles II between their layered structures;

[0041] The aforementioned high-pressure nozzle II is connected to the material pipeline and has a structure corresponding to the material pipeline.

[0042] Generally, this nozzle is a paired, integrated high-pressure nozzle for slurry application. High-pressure powdered agent is injected from the outer edge, while liquid agent is injected from the center. It is connected to a concentric high-pressure pipeline branching inside the drill pipe.

[0043] The function and effect of this embodiment:

[0044] (1) The integrated in-situ soil remediation high-pressure stirring and grouting drill of this utility model adds a hollow spiral auger blade to the traditional stirring and grouting drill. It can carry out pilot hole operation while stirring and grouting. During the pilot hole operation, the high-pressure nozzle set on the hollow spiral auger blade realizes the cutting of the contaminated soil to be remediated and the injection of reagents. It avoids the secondary pollution caused by the soil not being remediated and reagents not being added during the pilot hole operation.

[0045] (2) The integrated drilling tool combining jetting and pilot hole improves repair efficiency and reduces unnecessary cost waste.

[0046] (3) The integrated high-pressure nozzle on the mixing blade of the drive drill bit achieves simultaneous spraying of powder and liquid. The spraying of powder agent on the outer edge forms a Venturi effect under the drive of high-pressure airflow, thereby adsorbing and mixing the liquid agent. At the outlet of the nozzle, the powder agent is instantly atomized, achieving the best ratio of powder agent and liquid agent, reducing the problem of uneven agent mixing caused by the independent nozzles. Furthermore, under the action of the mixing blade, the two phases of agent fully contact and blend with the contaminated soil, achieving the best remediation effect. Attached Figure Description

[0047] Figure 1This is a schematic diagram of an integrated in-situ soil remediation high-pressure stirring jet drilling tool according to an embodiment of this utility model;

[0048] Figure 2 This is a cross-sectional schematic diagram of an integrated in-situ soil remediation high-pressure stirring jet drilling tool according to an embodiment of this utility model;

[0049] Figure 3 A magnified view of the integrated slurry nozzle;

[0050] Figure 4 Cross-sectional view of a high-pressure nozzle shared by an integrated slurry unit;

[0051] In the figure, the same reference numerals indicate the same structure and parts, where 1-drill rod, 2-hollow auger blade, 3-nozzle, 4-driving drill bit, 401-mixing blade, 402-tooth rake, 403-integrated slurry-shared high-pressure nozzle, 5-solid auger blade, and 6-concentric high-pressure pipeline. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0053] like Figure 1-4 As shown in the figure, this embodiment provides an integrated in-situ soil remediation high-pressure stirring and jetting drill, which includes a drill rod 1 and a screw conveyor blade;

[0054] The drill rod 1 has a concentric high-pressure pipeline 6 (high-pressure material pipeline) that runs through the length of the drill rod. It adopts a double-cavity design, including an outer material pipeline 6-2 (i.e., the outer pipeline) and a central material pipeline 6-1 (i.e., the inner pipeline). The two pipelines are formed by two concentric circular tubes stacked together, and there are connecting rods inside to fix them to each other.

[0055] The lowest end of the drill rod 1 is equipped with a drive drill bit 4;

[0056] The auger blade, coiled around the outer surface of the drill pipe, includes a hollow auger blade 2 and a solid auger blade 5;

[0057] Specifically, in the lower part of the drill rod 1, which connects to the drive drill bit 4, a hollow auger blade 2 with a length of not less than 2m is provided in the axial direction of the drill rod 1. Solid auger blades 5 are provided in the remaining area of ​​the drill rod 1 away from the drive drill bit 4 in the axial direction. The auger blade is preferably fixed to the drill rod 1 by welding.

[0058] In addition, the hollow auger blade 2 has a hollow structure. In some preferred embodiments, in order to avoid excessive stress and deformation during the stirring and spraying operation due to the thin wall thickness, the wall thickness of the hollow auger blade 2 is set at 5-10mm.

[0059] The hollow auger blade 2 is equipped with several high-pressure nozzles 3 (high-pressure nozzles I), and the high-pressure nozzles 3 are connected to the concentric high-pressure pipeline 6 through a connecting passage 2-1. In some preferred embodiments, the preferred spacing between the nozzles is about 30-50cm.

[0060] In addition, the driving drill bit 4 is provided with a symmetrical double-layer stirring blade 401 (in this embodiment, it is double-layered, but the number of layers can be adjusted according to actual use needs). Each layer of stirring blade 401 can be connected to the main body by welding or other means, or can be connected by detachable means such as high-strength bolts, and arranged along the axisymmetric direction of the drill rod 1.

[0061] The mixing blade 401 has a certain angle with the transverse section of the driving drill bit 4 body (ranging from 15-45° depending on the actual needs of use), which makes it easier for the drill bit to provide an upward pushing force to the contaminated soil during the soil cutting and drilling construction process, so that it can move onto the cavity auger blade and thus achieve the overall pilot hole effect.

[0062] Several rakes 402 are arranged on the lower edge of each layer of stirring blades 401. The rakes 402 are wear-resistant high-strength alloy drill bits and are connected to the stirring blades 401 with high-strength wear-resistant bolts. In actual use, if the stirring blades 401 and rakes 402 are worn after long-term use, the bolts can be removed and replaced.

[0063] Additionally, an integrated slurry nozzle 403 (high-pressure nozzle II) is installed in the middle of the double-layer mixing blades 401, and is threadedly fixed to the grouting drill bit 4. To prevent damage to the grouting drill bit during grouting and cutting of contaminated soil, the integrated slurry nozzle 403 is protected by a cylindrical tube 403A. The integrated slurry nozzle 403 adopts a dual-channel design. The outer spray outlet is annular and connects to the outer cavity of the concentric high-pressure pipeline 5 during grouting. This channel can be connected to the powder injection equipment of the grouting backend equipment to spray the repair agent in powder form. The middle spray channel of the integrated slurry nozzle 403 is a circular spray nozzle, connected to the inner cavity of the concentric high-pressure pipeline 6. This channel is connected to the grouting equipment backend equipment, and the repair agent is sprayed in liquid form. A cross-sectional view of its specific design is shown below. Figure 4 .

[0064] The function and effect of this embodiment:

[0065] This embodiment of the integrated in-situ remediation high-pressure jet grouting drill tool improves upon traditional jet grouting drill tools. In addition to the drill rod and approach drill bit, it uniquely adds hollow auger blades. The auger blades have internal hollow channels that connect to the remediation agent channels on the concentric high-pressure drill rod. During actual use, as the jet grouting drill bit cuts through the contaminated soil, the stirring blades further integrate the contaminated soil and the sprayed agent, enhancing their reactivity. Furthermore, driven by the hollow auger blades, the contaminated soil moves upwards with the blades, reducing the resistance from deep soil layers during drilling and improving the overall efficiency of in-situ jet grouting remediation. It effectively avoids the need for pre-drilling and drill rod replacement during in-situ deep contaminated soil remediation. It achieves an integrated jet grouting effect.

[0066] Simultaneously, as the auger blades move upwards, the contaminated soil reacts further with the high-pressure drill bit at the blade edge, allowing the high-pressure sprayed remediation agent to be injected. At the blade edge, the high-pressure sprayed agent comes into further contact with the soil on the outer edge of the spraying blades. Under the cutting force of the high-pressure jet, the agent further integrates with the soil pores, also contributing to the remediation of soil outside the blade radius, thus enhancing the radiation radius of the spraying agent. This reduces the number of piles required for spraying operations, and using this integrated drilling tool further enhances the market competitiveness of in-situ spraying operations for contaminated soil.

[0067] The traditional high-pressure nozzle and internal injection pipeline were modified. Both the internal injection pipeline and the integrated powder-slurry shared nozzle adopted a dual-cavity channel design. During agent injection, the powdered agent was sprayed from the outer edge of the integrated high-pressure nozzle, driven by high-pressure gas within the pipeline. When the high-pressure gas and powdered agent were mixed and sprayed out of the integrated high-pressure nozzle, a Venturi effect was formed in the inner cavity of the nozzle under the high-pressure airflow velocity, creating a certain vacuum environment. This created an adsorption force on the liquid remediation agent from the liquid nozzle. Under the action of adsorption force, the powdered agent, liquid agent, and high-pressure air were uniformly mixed and then mixed with the contaminated soil agitated by the mixing blades under high pressure. This agent spraying method increased the contact area between the agent and the contaminated soil, improved the agent's reactivity, and made the agent addition more economical in the spraying construction.

[0068] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated in-situ soil remediation high pressure jetting drill, characterized by: The drill rod and the auger blade are included. The drill rod has a high-pressure material pipeline inside the rod body through the length of the drill rod. The auger blade is coiled on the outer surface of the drill rod and includes a cavity auger blade. The head end of the cavity auger blade is adjacent to the driving drill bit and has a hollow structure with a plurality of high-pressure nozzles I.

2. An integrated in-situ soil remediation high pressure jetting and augering drill according to claim 1, wherein: The auger blade also includes a solid auger blade. The solid auger blade is connected to the tail end of the cavity auger blade.

3. An integrated in-situ soil remediation high pressure jetting and augering drill according to claim 1, wherein: The wall thickness of the cavity auger blade is 5-10mm. And / or The spacing of the nozzles on the cavity auger blade is 30-50cm.

4. An integrated in-situ soil remediation high pressure jetting and augering drill according to claim 1, wherein: The high-pressure material pipeline has a double-layer sleeve structure including an outer material pipeline and a central material pipeline. The central material pipeline is nested inside the outer material pipeline.

5. An integrated in-situ soil remediation high pressure jetting and auger drill as defined in claim 4, wherein: The high-pressure nozzle I has a double-layer structure corresponding to the high-pressure material pipeline, which respectively connects the discharge ports of the outer material pipeline and the central material pipeline.

6. The integrated in-situ soil remediation high-pressure stirring and spraying drill according to any one of claims 1-5, characterized in that: It also includes a driving drill bit and a multi-layer stirring blade. The driving drill bit is arranged at the head end of the drill rod. The multi-layer stirring blade is arranged on the driving drill bit in a certain angle and axisymmetrically.

7. An integrated in-situ soil remediation high pressure jetting and augering drill according to claim 6, wherein: The multi-layer stirring blade is detachably mounted on the driving drill bit.

8. An integrated in-situ soil remediation high pressure jetting and augering drill according to claim 6, wherein: Each stirring blade of the multi-layer stirring blade is provided with a plurality of tooth rakes.

9. An integrated in-situ soil remediation high pressure jetting and auger drill as defined in claim 8, wherein: The tooth rake is detachably mounted on the stirring blade.

10. The integrated in-situ soil remediation high-pressure stirring and spraying drill according to claim 6, characterized in that: The multi-layer stirring blade has a plurality of high-pressure nozzles II between the layered structures. The high-pressure nozzles II are in communication with the material pipeline and have a structure corresponding to the high-pressure material pipeline.

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