Injection device and injection method for a fluid for soil pollution treatment

Abstract

The application discloses an injection device for soil pollution treatment fluid, which comprises a pressing pipe, a soil taking cavity and a grouting pipe, the grouting pipe and the soil taking cavity are arranged in the pressing pipe, the grouting pipe is used for injecting the soil pollution treatment fluid into the soil, and the soil taking cavity is provided with a push rod, and the push rod is used for backfilling the soil in the soil taking cavity into the pressing hole.

Description

Technical Field

[0001] This invention relates to an injection device for a fluid used in soil pollution treatment, and further to a method for injecting a soil treatment fluid including the above-described injection device. Background Technology

[0002] In some methods for treating contaminated soil, it is necessary to inject remediation or treatment fluids into the contaminated soil. Existing technologies for injecting fluids into soil draw on high-pressure grouting processes, commonly including direct pressure injection and rotary jet injection. Direct pressure injection involves pressing a grouting pipe into the soil, using high pressure to directly inject liquid into the target location. The liquid then permeates from the injection point to the surrounding area, ultimately achieving uniform penetration into the soil. Rotary jet injection, in addition to the liquid injection pipe, also includes a high-pressure air pipe. High-pressure gas from a rotating nozzle first fractures the soil to create fissures, then injects liquid into these fissures, thereby injecting fluid over a wider area of ​​the soil and improving the injection effect. In both methods, after the liquid injection is completed, the grouting pipe is pulled out and moved to the next location for further work. The drawback is that when the grouting pipe is pulled out, an injection hole will be formed in the soil. In addition, both direct injection and jet injection methods use high-pressure gas or liquid to open an injection channel on the side wall of the injection hole. The injection channel can be maintained for a period of time. When the grouting pipe is pulled out, the treatment liquid injected into the soil is prone to flow back along this injection channel and accumulate at the bottom of the injection hole. This results in less liquid injected into the soil than designed, while the injection hole is filled with a large amount of treatment liquid, making the distribution of the injected fluid unsatisfactory and affecting the seepage and treatment effect of the treatment liquid. Summary of the Invention

[0003] The purpose of this invention is to provide an injection device that can effectively prevent backflow of soil treatment liquid after injection, and to provide an injection method that can effectively prevent backflow of liquid after injection into the soil.

[0004] Therefore, the present invention provides a fluid injection device for soil pollution treatment, comprising an injection pipe, a soil sampling cavity, and a grouting pipe, wherein the grouting pipe and the soil sampling cavity are disposed inside the injection pipe, the grouting pipe is used to inject soil pollution treatment fluid into the soil, and the soil sampling cavity is provided with a push rod, which is used to backfill the soil in the soil sampling cavity into the injection hole.

[0005] Furthermore, the injection pipe is provided with a soil sampling cavity and a grouting pipe from the outside to the inside. The injection pipe is provided with a grouting hole. The grouting pipe is connected to a nozzle. The grouting hole and the grouting pipe are connected by a connecting pipe. The outer side of the connecting pipe is provided with a protective part. The nozzle cooperates with the grouting hole to inject fluid into the soil.

[0006] The grouting pipe protrudes from the end of the injection pipe. The grouting pipe is connected to a nozzle, which is set close to the surface of the grouting pipe. A protective part is provided on the outside of the nozzle. The protective part can rotate around the support fixed on the grouting pipe, so that the protective part can be retracted or extended so that the nozzle is parallel or perpendicular to the injection hole.

[0007] Furthermore, the protective part includes an outer protective plate and a protective pipe. The outer protective plate has a U-shaped cross-section. One end of the outer protective plate is hinged to the support of the grouting pipe. A connecting rod is hinged to the inner side of the outer protective plate, and the protective part is controlled to unfold or retract by moving the connecting rod longitudinally.

[0008] Furthermore, the outer protective plate is provided with a lower soil retaining plate at one end connected to the support, and an upper soil retaining plate at the other end. The lower soil retaining plate is an elastic L-shaped plate integrally formed with the outer protective plate or fixed on the outer protective plate. The upper soil retaining plate is fixed on the outer surface of the grouting pipe and cooperates with the outer protective plate to block the soil when the outer protective plate is retracted.

[0009] Furthermore, it also includes a limiting part, which is a limiting cable connecting the protective part and the surface of the grouting pipe.

[0010] The side wall of the injection pipe is provided with a grouting pipe, the grouting pipe is equipped with a nozzle, the nozzle is directly opposite the grouting hole, and the soil extraction cavity is located inside the injection pipe.

[0011] Furthermore, a soil retaining part is provided on the outside of the grouting hole.

[0012] Furthermore, the retaining part includes a first retaining plate and a second retaining plate. The first retaining plate is fixed on the outer wall of the injection pipe. The outer wall of the injection pipe is provided with a groove, which is covered by the first retaining plate. The second retaining plate has a protrusion that mates with the groove. The second retaining plate is located between the first retaining plate and the outer wall of the injection pipe. The second retaining plate is provided with a through hole for mates with the grouting hole. The upper end of the first retaining plate is provided with an opening, through which the soil can squeeze the first retaining plate.

[0013] The present invention also includes an injection method comprising the injection device of claim 1, comprising the following steps:

[0014] (1) Drive the injection pipe into the contaminated soil, and take soil during the driving process and store it in the soil extraction cavity;

[0015] (2) After the injection pipe is pressed into the predetermined depth, the injection pipe is pulled up a predetermined distance. The lower end of the injection pipe is suspended in the cavity formed by the injection hole. The control rod opens the protective part so that the nozzle is perpendicular to the side wall of the injection hole. The nozzle is opened to carry out high-pressure grouting operation.

[0016] (3) Continue to pull the injection pipe upward and carry out high-pressure grouting. After the grouting of the target section is completed, control the connecting rod to retract the protective part and push the push rod to backfill the injection hole of the target section with soil, and seal the injection hole and the crack formed by high-pressure grouting.

[0017] (4) Repeat steps (2) and (3) to complete the layered high-pressure grouting and backfilling of soil at different heights.

[0018] The beneficial effects of this invention are as follows:

[0019] (1) The present invention includes a pressing pipe, a soil sampling cavity and a grouting pipe. The grouting pipe and the soil sampling cavity are located inside the pressing pipe. During the pressing process of the pressing pipe, the soil enters the soil sampling cavity. After grouting the contaminated soil, the push rod in the soil sampling cavity pushes the soil into the pressing hole exposed after the pressing pipe is lifted, thus sealing the backflow channel formed by the pressing hole and grouting, thereby effectively preventing the backflow of the treatment liquid.

[0020] (2) In a specific embodiment of the present invention, the grouting pipe protrudes from the end of the injection pipe, the grouting pipe is connected to the nozzle, the nozzle is set close to the surface of the grouting pipe, and a protective part is provided on the outside of the nozzle. The protective part is used to protect the nozzle. The protective part can rotate around the support fixed on the grouting pipe, so that the protective part can be retracted or unfolded so that the nozzle is parallel or perpendicular to the injection hole. When the injection pipe is pressed down, the protective part retracts to protect the nozzle, the soil enters the soil extraction cavity, and after reaching the target depth, the injection pipe is pulled up a predetermined distance so that the lower end of the grouting pipe is selected in the cavity of the injection hole. The control rod opens the protective part so that the nozzle is perpendicular to the side wall of the injection hole. Both rotary injection and direct pressure injection can be used. After the predetermined height section of grouting is completed, the protective part is retracted, and the push rod is pushed to backfill the injection hole. The above process is repeated to complete the grouting and soil backfilling. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the injection port and the return channel;

[0022] Figure 2 This is a longitudinal cross-sectional schematic diagram of the injection device in Example 1;

[0023] Figure 3 This is a schematic cross-sectional view of the injection device;

[0024] Figure 4 This is a schematic diagram of the grouting pipe end in Example 2;

[0025] Figure 5 for Figure 4 A partial sectional view;

[0026] Figure 6 This is a schematic diagram of Example 3;

[0027] Figure 7This is a longitudinal sectional view of the retaining plate in Example 2.

[0028] Explanation of reference numerals in the attached drawings: 1. Press-in pipe; 101. Outer wall of press-in pipe; 2. Soil extraction cavity; 3. Push rod; 4. Grouting pipe; 5. Conical head; 6. Nozzle; 7. Connecting pipe; 8. Grouting hole; 9. Retaining part; 901. First retaining plate; 902. Second retaining plate; 903. Protrusion; 904. Through hole; 10. Protective part; 101. Outer protective plate; 102. Protective pipe; 103. Support; 104. Lower retaining plate; 105. Upper retaining plate; 106. Limiting block; 107. Limiting cable; 108. Connecting rod; 11. Grouting pipe; 12. Groove. Detailed Implementation

[0029] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0030] Reference Figures 1 to 6As shown, an injection device for treating soil pollution according to the present invention includes an injection pipe 1, a soil sampling cavity 2, and a grouting pipe 4. The grouting pipe 4 and the soil sampling cavity 2 are disposed inside the injection pipe 1. The grouting pipe 4 is used to inject a treatment fluid for contaminated soil into the soil. This fluid typically includes an oxidant for treating organic pollutants. The soil sampling cavity 2 is provided with a push rod 3, which is used to backfill the soil in the soil sampling cavity 2 into the injection hole. In Example 1, the injection pipe 1 and the grouting pipe 4 are fixed. The soil extraction cavity 2 is located between the injection pipe 1 and the grouting pipe 4. The lower end of the injection pipe 1 has an opening. When the injection pipe 1 is pressed into the soil, the soil enters the soil extraction cavity 2 through the opening. Both the injection pipe 1 and the grouting pipe 4 can be made of stainless steel. The lower end of the grouting pipe 4 has a conical head 5. A liquid pipe is provided inside the grouting pipe 4. When using the rotary jet grouting method, a gas pipe is also provided. The gas pipe and the liquid pipe are equipped with nozzles 6. When using the rotary jet grouting method, a special nozzle for high-pressure rotary jet grouting can be used. The injection pipe 1 has a grouting hole 8. The nozzle 6 can be fixed in the grouting hole 8. The grouting hole 8 and the grouting pipe 4 are connected... The grouting hole 8 is connected by a connecting pipe 7. A retaining part 9 is provided on the outside of the grouting hole 8. The retaining part 9 includes a first retaining plate 901 and a second retaining plate 902. The first retaining plate 901 is fixed on the outer wall of the pressing pipe 1. The outer wall of the pressing pipe 1 is provided with a groove 12. The groove 12 is covered by the first retaining plate 901. The second retaining plate 902 has a protrusion 903 that cooperates with the groove 12. The second retaining plate 902 is located between the first retaining plate 901 and the outer wall of the pressing pipe 1. The second retaining plate 902 is provided with a through hole 904 for cooperating with the grouting hole 8. The upper end of the second retaining plate 902 is partially exposed in the soil. The soil can compress the second retaining plate 902. When the injection pipe 1 is pressed down, the lower end of the second retaining plate 902 moves upward along the groove 12 under the reaction force of the soil. The through hole 904 is misaligned with the grouting hole 8. The through hole 904 is blocked by the first retaining plate 901, and the grouting hole 8 is blocked by the second retaining plate 902, preventing soil from entering the grouting hole 8 and blocking the nozzle 6. When the injection pipe 1 is pulled up, the outer soil squeezes the second retaining plate 902 from the top and pushes the second retaining plate 902 downward along the groove 12, so that the through hole 904 is aligned with the grouting hole 8. At the same time, the through hole 904 is exposed outside the first retaining plate 901, and gas and liquid are injected into the soil through the grouting hole 8. In this embodiment, the upper end of the injection pipe 1 is connected to the pile driver, and the push rod 3 of the injection pipe 1 passes through the upper end of the injection pipe 1 and is connected to the push block. The push block cooperates with the soil extraction cavity 2. The push rod 3 is driven by an electric telescopic mechanism or a hydraulic mechanism. The grouting pipe 4 is connected to the high-pressure grouting machine. The injection pipe 1 is pressed in or pulled out by the static pressure pile driver. When the rotary jet injection method is used, the injection pipe 1 may not be connected to the pile driver. Instead, the upper end of the injection pipe 1 is connected to the drilling rig, and the drilling rig drives the injection pipe 1 to rotate. A pressure plate is provided at the upper end of the injection pipe 1, and the hydraulic cylinder is located below the pressure plate and connected to the push rod 3. The grouting machine, static pressure pile driver, drilling rig, and hydraulic press mentioned above are all existing technologies and are not the structures to be improved in this invention. Their structures will not be described in detail.

[0031] In the above embodiment 1, as Figure 2 and Figure 3 As shown, the injection pipe 1 is provided with a soil sampling cavity 2 and a grouting pipe 4 from the outside to the inside. The outer side of the connecting pipe 7 is provided with a protective part 10. In this embodiment, the gas pipeline and the liquid pipeline are usually made of flexible hoses. The connecting pipe 7 is made of flexible hoses. The protective pipe 102 is a high-strength steel pipe. The shape of the steel pipe can be circular or its cross-section can be rhomboid. When the injection pipe 1 is pressed into the soil, the protective pipe 102 can easily split the soil so that the soil enters the soil sampling cavity 2 from both sides of the protective pipe 102.

[0032] Reference Figure 4 and Figure 5 As shown, Embodiment 2 of the present invention is basically the same as Embodiment 1, except that the grouting pipe 4 protrudes from the end of the injection pipe 1. The nozzle of the grouting pipe 4 is arranged close to the surface of the grouting pipe 4. The nozzle is connected to the protective part 10. The protective part 10 can rotate around the support 103 fixed on the grouting pipe 4, so that the protective part 10 can be retracted or extended so that the nozzle is parallel or perpendicular to the injection hole. The protective part 10 may include an outer protective plate 101 and a protective pipe 102. The cross-section of the outer protective plate 101 is U-shaped. One end of the outer protective plate 101 is hinged to the support 103 of the grouting pipe 4. The connecting rod 108 is hinged to the inner side of the outer protective plate 101, and the longitudinal movement of the connecting rod 108 controls the extension or retraction of the protective part 10. The connecting rod can be connected to the hydraulic device of the pressure plate at the upper end of the injection pipe and driven by the hydraulic device. Of course, the above-mentioned device for rotating the protective part can also be controlled by other existing technologies, such as an electric telescopic device. The working process is as follows: After the injection pipe 1 is driven into the predetermined position in the soil, it is pulled upwards, forming an injection hole at the lower end of the injection pipe 1. The diameter of the injection hole is the same as the diameter of the injection pipe 1. The diameter of the grouting pipe 4 is smaller than the diameter of the injection hole. Therefore, when the injection pipe 1 is pulled up, the lower end of the grouting pipe 4 is suspended in the injection hole. By rotating the protective part 10, the nozzle is made perpendicular to the side wall of the injection hole. By setting the length of the protective part 10, the distance between the nozzle and the side wall can be set. Usually, the nozzle is close to the side wall. In addition, the angle between the nozzle and the side wall can also be adjusted. The perpendicular angle is only the preferred or commonly used angle. The nozzle is opened to inject the treatment fluid. If the rotary injection method is used, the injection pipe 1 can be rotated and pulled up at the same time. After the treatment fluid is injected to the predetermined height, the protective part 10 is retracted, the push rod 3 is pressed down, and the soil is backfilled into the injection hole.

[0033] In the above embodiment 2, referring to Figure 7As shown, one end of the outer protective plate 101 connected to the support 103 is provided with a lower soil retaining plate 104, and the other end is provided with an upper soil retaining plate 105. The lower soil retaining plate 104 is an elastic L-shaped plate integrally formed with the outer protective plate 101 or fixed on the outer protective plate 101. The upper soil retaining plate 105 is fixed on the outer surface of the grouting pipe 4 and cooperates with the outer protective plate 101. When the outer protective plate 101 is retracted, it is used to prevent soil from blocking the nozzle 6. The upper soil retaining plate 105 is provided with a groove for the connecting rod 108 to pass through. There is a gap between the L-shaped plate and the grouting pipe 4. When the injection pipe 1 is pressed down, the L-shaped plate deforms under the action of soil pressure, and the gap disappears, preventing a large amount of soil from entering through the gap. When it is pulled up, a small amount of soil that has entered the outer protective plate 101 can fall out through the gap, preventing a large amount of soil from affecting the retraction of the protective part 10 inside the outer protective plate 101. A limiting block 106 can be fixed on the surface of the grouting pipe 4 above the L-shaped plate to prevent the L-shaped plate from deforming excessively and causing gaps. A limiting part can also be provided, which is a limiting cable 107 connecting the protective part 10 and the surface of the grouting pipe 4. The length of the limiting cable 107 can make the nozzle 6 inside the protective part 10 perpendicular to the side wall of the injection hole.

[0034] Reference Figure 6 As shown, Embodiment 3 of the present invention is basically the same as Embodiment 1, except that a grouting pipe 11 is provided in the side wall of the injection pipe 1, the grouting pipe 11 is provided with a nozzle, the nozzle is directly opposite the grouting hole 8, and the soil extraction cavity 2 is provided inside the injection pipe 1.

[0035] The present invention also includes an injection method comprising the injection device of claim 1, comprising the following steps:

[0036] (1) Drive the injection pipe 1 into the contaminated soil, and take soil during the driving process and store it in the soil extraction cavity 2;

[0037] (2) After the injection pipe 1 is pressed into the predetermined depth, the injection pipe 1 is pulled up to a predetermined distance. The lower end of the grouting pipe 4 is suspended in the cavity formed by the injection hole. The control rod opens the protection part 10 so that the nozzle 6 is perpendicular to the side wall of the injection hole. The nozzle 6 is opened to carry out high-pressure grouting operation.

[0038] (3) Continue to pull up the injection pipe 1 and carry out high-pressure grouting. After the grouting of the target section is completed, control the connecting rod to retract the protective part 10, push the push rod 3 to backfill the injection hole of the target section with soil, and seal the injection hole and the crack formed by high-pressure grouting.

[0039] (4) Repeat steps (2) and (3) to complete the layered high-pressure grouting and backfilling of soil at different heights.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An injection device for fluids used in soil pollution treatment, characterized in that: It includes an injection pipe, a soil sampling cavity, and a grouting pipe. The grouting pipe and the soil sampling cavity are located inside the injection pipe. The grouting pipe is used to inject treatment fluid for soil pollution into the soil. The soil sampling cavity is equipped with a push rod, which is used to backfill the soil in the soil sampling cavity into the injection hole. The injection pipe is provided with a soil sampling cavity and a grouting pipe from the outside to the inside. The injection pipe is provided with a grouting hole. The grouting pipe is connected to a nozzle. The grouting hole and the grouting pipe are connected by a connecting pipe. The outside of the connecting pipe is provided with a protective part. The nozzle is fixed in the grouting hole. The nozzle and the grouting hole cooperate to inject fluid into the soil. The lower end of the injection pipe has an opening. When the injection pipe is pressed into the soil, the soil enters the soil extraction cavity through the opening. After grouting into the contaminated soil, the push rod in the soil extraction cavity is pushed to push the soil into the injection hole exposed after the injection pipe is pulled up, thus sealing the injection hole and the backflow channel formed by the grouting. A retaining section is provided on the outside of the grouting hole; The retaining part includes a first retaining plate and a second retaining plate. The first retaining plate is fixed on the outer wall of the injection pipe. The outer wall of the injection pipe is provided with a groove, which is covered by the first retaining plate. The second retaining plate has a protrusion that mates with the groove. The second retaining plate is located between the first retaining plate and the outer wall of the injection pipe. The second retaining plate is provided with a through hole for mates with the grouting hole. The upper end of the first retaining plate is provided with an opening, through which the soil can squeeze the first retaining plate.

Images