A reaction well construction method

Abstract

The present invention provides a method for constructing a reaction well. The reaction well comprises: a reaction channel; an outer jacket structure located around the reaction channel; and an expansion structure disposed outside the outer jacket structure and extending outward from the outer jacket structure. The present invention utilizes the expansion structure to increase the contact area with the surrounding soil and groundwater, thereby improving remediation efficiency. Furthermore, the expansion structure can reinforce soft soil, reducing or even preventing collapse.

Description

Technical Field

[0001] The present invention belongs to the technical field of in-situ remediation of soil and groundwater, and in particular relates to a method for constructing a reaction well. Background Art

[0002] Currently, commonly used soil and groundwater remediation engineering technologies are divided into two categories: in-situ remediation and ex-situ remediation. According to the remediation methods, they can be divided into physical remediation, chemical remediation and biological remediation. Ex-situ remediation involves the excavation, transportation, off-site remediation / disposal of contaminated soil, and the extraction, temporary storage or on-site ex-situ treatment of groundwater, which can easily cause the leakage and spread of pollutants. In addition, the disposal process needs to be strictly supervised and has high management requirements. In-situ remediation does not involve basic construction such as deep foundation pit excavation and support, foundation pit dewatering and water stopping, which effectively avoids secondary pollution while reducing the probability of safety accidents. In-situ remediation technology for soil and groundwater has been favored in China in recent years.

[0003] The difficulty and challenges of in situ remediation of soil and groundwater are determined by factors such as the diversity of remediation media in contaminated sites (combined soil and water pollution, single soil pollution, single groundwater pollution), the complexity of hydrogeological conditions, the diversity of pollution types (organic pollution, heavy metals, etc.), the particularity of pollutants, and the uneven and different distribution in soil and groundwater.

[0004] The existing in-situ soil and groundwater remediation processes have the following main deficiencies:

[0005] First, for large-scale contaminated sites, the existing remediation technology has a small volume for single drilling repairs, and a large number of holes need to be drilled in the contaminated site, resulting in a large drilling workload. Especially when repairing weak permeability formations, the diffusion radius of the remediation agent is small, and the agent is unevenly mixed with the soil and groundwater, resulting in unsatisfactory remediation results.

[0006] Second, soil layers, sand layers, gravel layers and other soils are prone to collapse during the drilling process, affecting subsequent construction.

[0007] Third, traditional reaction wells use perforated PVC or stainless steel well pipes, which are very easy to clog and affect the repair efficiency. Summary of the Invention

[0008] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art. To this end, the present invention provides a reaction well that can reduce or even solve the problem of collapse and improve the repair effect.

[0009] The present invention also provides a reaction well construction method for constructing the reaction well.

[0010] The reaction well according to the embodiment of the first aspect of the present invention comprises:

[0011] Reaction channel;

[0012] a jacket structure located at the periphery of the reaction channel;

[0013] The outward expansion structure is arranged on the outside of the outer shell structure and extends outward from the outside of the outer shell structure.

[0014] The reaction well according to the embodiment of the present invention has at least the following beneficial effects:

[0015] The reaction well in the present invention utilizes an outward expansion structure to increase the contact area with the surrounding soil and groundwater, thereby improving the repair efficiency. Furthermore, the outward expansion structure can reinforce soft soil, reducing or even preventing collapse.

[0016] According to some embodiments of the present invention, the sidewall of the reaction channel is provided with a porous support structure.

[0017] According to some embodiments of the present invention, the perforated support structure is a perforated PVC pipe or a perforated stainless steel pipe.

[0018] According to some embodiments of the present invention, the outer shell structure is a foam structure.

[0019] According to some embodiments of the present invention, the outward expansion structure is a foaming structure.

[0020] According to some embodiments of the present invention, the outer shell structure and the outward expansion structure are integrally foamed.

[0021] According to some embodiments of the present invention, the outward expansion structure is a spiral structure coaxially distributed with the reaction channel.

[0022] A method for constructing a reaction well according to a second embodiment of the present invention includes the following steps:

[0023] S01, rotary drilling of the shaft and excavation of transverse passages on the side walls of the shaft;

[0024] S02, pouring foaming material into the vertical shaft for foaming filling;

[0025] S03, rotary digging a reaction channel in the center of the foaming material, thereby forming a jacket structure located at the periphery of the reaction channel and an outward expansion structure extending outward along the jacket structure.

[0026] According to some embodiments of the present invention, in step S01, a drill rod with spiral blades is used for rotary drilling, thereby forming a spiral channel around the vertical shaft, and thereby forming a transverse channel.

[0027] According to some embodiments of the present invention, in step S01, a drill rod with a channel in the center is used for rotary drilling. In step S02, the channel is used to pour the foaming material, and the pouring speed matches the speed at which the drill rod exits the shaft.

[0028] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0030] Figure 1 Schematic diagram of a structure of a reaction well;

[0031] Figure 2 and Figure 3 Schematic diagram of the drill pipe structure. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present invention, "a plurality" refers to more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0036] Reference Figures 1 to 3As shown, a reaction well according to one embodiment of the present invention comprises, from the inside out, a reaction channel 100, an outer shell structure 102 located on the periphery of the reaction channel 100, and an expansion structure 103 disposed outside the outer shell structure 102. The expansion structure 103 extends outward from the outer shell structure 102. The reaction well according to the present invention utilizes the expansion structure 103 to increase the contact area with the surrounding soil and groundwater, thereby improving the repair efficiency. Furthermore, the expansion structure 103 can be used to reinforce soft soil, reducing or even preventing collapse.

[0037] In order to improve the structural strength and stability of the reaction channel 100 , a perforated support structure 101 is provided on the side wall of the reaction channel 100 , preferably a perforated PVC pipe or a perforated stainless steel pipe.

[0038] To improve permeability, both the outer shell structure 102 and the outer expansion structure 103 are foamed. Both can be integrally foamed. The structural arrangement of this embodiment, using foamed materials, significantly improves permeability while preventing soil collapse.

[0039] Furthermore, the outward expansion structure 103 is a spiral structure coaxially distributed with the reaction channel 100. This not only facilitates the filling and molding of the foaming material, but also helps to ensure the structural strength of the outward expansion structure 103.

[0040] In addition, the present invention also proposes a reaction well construction method, comprising the following steps:

[0041] S01, rotary drilling of a vertical shaft and excavation of a transverse channel 201 on the side wall of the vertical shaft. Specifically, a drill rod 200 with spiral blades on the circumference and a channel 201 in the center is used for rotary drilling, thereby forming a spiral channel 201 on the circumference of the vertical shaft and thereby forming a transverse channel 201;

[0042] S02, pouring foaming material into the shaft through the channel 201 at the center of the drill rod 200 for foaming and filling, and the drill rod 200 rotates in the opposite direction as the foaming material is poured and exits the shaft, with the pouring speed matching the speed at which the drill rod 200 exits the shaft; after complete exit, inserting a high-frequency vibrator to ensure that the foaming material is evenly filled and in place;

[0043] S03: A reaction channel 100 is drilled in the center of the formed foam material. A perforated support structure 101 is installed in the reaction channel 100. The surrounding foam material is used to form a jacket structure 102 located on the periphery of the reaction channel 100 and an expansion structure 103 extending outward from the jacket structure 102. The perforated support structure 101 is preferably a perforated PVC pipe or a perforated stainless steel pipe.

[0044] In summary, the present invention has the following advantages:

[0045] 1. The spiral foaming expansion structure 103 is used to increase the contact area between the reaction well and the surrounding soil and groundwater by more than 5 to 6 times;

[0046] 2. The foaming material is poured into the bottom of the shaft through the drill rod 200. The drill rod 200 is slowly rotated out in accordance with the molding speed of the foaming material, effectively avoiding the collapse that is very easy to occur during the drilling process in soft soil;

[0047] 3. The outer surface of the reaction channel 100 is a foam material with a porous structure and good water permeability. Compared with the traditional PVC pipe or stainless steel pipe with only holes, the overall water permeation efficiency of the reaction well is improved, and the problem of the holes in the PVC pipe or stainless steel pipe being blocked occurs. Groundwater can penetrate into the reaction channel 100 through the foam material and react with the reagents therein;

[0048] 4. The foam material is formed to fill the reaction well, and the reaction channel 100 is rotary-dug in the foam material filling area. The reaction channel 100 is constructed with high precision.

[0049] The present invention has been described in detail above with reference to the embodiments. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the spirit of the present invention.

Claims

1. A method for constructing a reaction well, characterized in that: The reaction well comprises: a reaction channel, wherein a perforated support structure is provided on the side wall of the reaction channel, wherein the perforated support structure is a perforated PVC pipe or a perforated stainless steel pipe; a jacket structure located on the periphery of the reaction channel; an expansion structure, wherein the expansion structure is provided on the outside of the jacket structure and extends outward from the outside of the jacket structure; the jacket structure and the expansion structure are an integrally foamed foam structure; and the expansion structure is a spiral structure coaxially distributed with the reaction channel. The method comprises the following steps: S01, rotary drilling of the shaft and excavation of transverse passages on the side walls of the shaft; S02, pouring foaming material into the vertical shaft for foaming filling; S03, rotary digging the reaction channel in the center of the foaming material to form a jacket structure located at the periphery of the reaction channel and an outward expansion structure extending outward along the jacket structure.

2. The method for constructing a reaction well according to claim 1, wherein: In step S01, a drill rod with spiral blades is used for rotary drilling, thereby forming a spiral channel around the vertical shaft, and thereby forming a transverse channel.

3. The method for constructing a reaction well according to claim 1, wherein: In step S01, rotary drilling is performed using a drill rod with a channel in the center. In step S02, the channel is used to pour foaming material, and the pouring speed matches the speed at which the drill rod exits the shaft.

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