Spliced box type barrier wall structure and construction method thereof

Abstract

The present application relates to the field of engineering construction technology, especially to a spliced box type barrier wall structure, comprising a plurality of box type barrier unit bodies, the plurality of box type barrier unit bodies are transversely and longitudinally spliced by connecting lock strips to form a barrier wall structure, and each box type barrier unit body is filled with sealing material. The box type barrier unit body is welded into a rectangular box type structure by a high-density polyethylene geomembrane through a heat welding machine, has good corrosion resistance and long service life, the wall material has good uniformity, stable anti-seepage performance, and the permeability coefficient can reach 1*10 ‑8 cm / s or less, and has good load deformation resistance to avoid the adverse effects of stress concentration. The box type barrier unit body is modularized and prefabricated in advance, and is simple, fast and easy to install, and has good stability, better anti-seepage integrity and sealing performance. The present application is not restricted by external environment, and avoids the problems of traditional anti-seepage walls, such as the decrease of anti-seepage performance caused by groundwater.

Description

Technical Field

[0001] This invention relates to the field of engineering construction technology, and in particular to a splicing box-type barrier wall structure and its construction method. Background Technology

[0002] With economic development, many pollution problems at sites such as tailings ponds, solid waste disposal sites, landfills, and industrial sites require remediation. Barrier wall technology involves installing vertical barrier curtains around the contaminated site to contain pollutants within the barrier, preventing their spread and protecting the surrounding ecological environment from pollution.

[0003] Currently, commonly used barrier wall technologies mainly use cement as the primary material, mixed with fillers such as bentonite, such as cement-soil mixing piles for seepage prevention and bentonite-based seepage prevention walls. However, traditional seepage prevention walls using cement as the material have many drawbacks, such as poor uniformity of the wall material, poor seepage prevention performance, cracks caused by uneven settlement leading to seepage prevention failure, and complex construction procedures requiring slurry preparation and sprinkler irrigation. Furthermore, the wall is easily affected by the external environment (such as groundwater), leading to a decrease or failure of its seepage prevention performance.

[0004] In recent years, flexible seepage-proof walls based on HDPE geomembrane materials have emerged. These walls require special tools for membrane connection and are mainly constructed by first laying HDPE geomembrane and then covering it with slurry material. The installation process is complicated, the wall has poor load-bearing capacity, and slurry material still needs to be backfilled into the trench after installation. This results in high construction costs and a long construction period.

[0005] Given the numerous shortcomings of existing barrier wall technologies, there is a need to design a barrier wall that is simple and convenient to construct, easy to install, has durable wall materials, a long service life, is not restricted by environmental factors during construction, and has good uniformity in preventing seepage. Summary of the Invention

[0006] This invention provides a spliced ​​box-type barrier wall structure and its construction method to solve the problems of poor uniformity of wall material, poor seepage prevention performance, complex construction procedures, high construction costs, and long construction period of existing barrier walls. It achieves the effects of simple and convenient construction, easy installation, good durability of wall material, long service life, and construction not being restricted by environmental factors, and good uniformity of wall seepage prevention.

[0007] This invention provides a splicing box-type barrier wall structure, comprising multiple box-type barrier units. The multiple box-type barrier units are spliced ​​horizontally and vertically through connecting locking strips to form a barrier wall structure. Each box-type barrier unit is filled with sealing material.

[0008] The box-type barrier unit is made of high-density polyethylene geomembrane and welded into a rectangular box structure by a hot welding machine. An injection port is provided on the top surface of the box-type barrier unit, and a sealing component is installed on the injection port.

[0009] The box-type barrier unit has a width of 1 to 3 meters, a height of 3 to 5 meters, and a thickness of 0.3 to 0.8 meters. The high-density polyethylene geomembrane has a thickness of 1.5 to 3 millimeters.

[0010] The connecting lock bar includes an inner connecting lock bar and an outer connecting lock bar;

[0011] The inner connecting lock strip is fixed on the lower surface of the box-type barrier unit along the width direction of the box-type barrier unit; the inner connecting lock strip is also fixed on one side of the box-type barrier unit along the height direction of the box-type barrier unit; the outer connecting lock strip is fixed on the upper surface of the box-type barrier unit along the width direction of the box-type barrier unit; the outer connecting lock strip is also fixed on the other side of the box-type barrier unit along the height direction of the box-type barrier unit.

[0012] The outer connecting lock bar is strip-shaped, and its cross-section consists of a longitudinal connecting part and hook-shaped connecting parts connected to the top two sides of the longitudinal connecting part; the inner connecting lock bar is also strip-shaped, and its interior has a hole and groove that are the same shape as the outer connecting lock bar.

[0013] Both the inner and outer connecting lock strips are made of high-density polyethylene. The inner connecting lock strip is fixed by heat welding by embedding on the lower surface and one side of the box-type barrier unit, and the outermost part of the inner connecting lock strip is flush with the lower surface or side of the box-type barrier unit. The bottom of the longitudinal connecting part of the outer connecting strip is heat welded to the upper surface and another side of the box-type barrier unit.

[0014] Three sets of connecting inner locking strips are fixed on the lower surface and one side of the box-type barrier unit, and the three sets of connecting inner locking strips are evenly distributed along the thickness direction of the box-type barrier unit; three sets of connecting outer locking strips are fixed on the upper surface and another side of the box-type barrier unit, and the three sets of connecting outer locking strips are evenly distributed along the thickness direction of the box-type barrier unit.

[0015] An expansion strip is provided on the groove wall inside the inner locking bar of the connector. The expansion strip is a rubber expansion strip that expands when it comes into contact with water.

[0016] The sealing material filling the box-type barrier unit is made by mixing water and dry powder solid raw materials in a water-cement ratio of 1 to 1.5:1 and then solidifying it.

[0017] The dry powder solid raw material comprises the following substances in weight percentage: bentonite 10%–20%, polyacrylate 3%–5%, polyacrylamide 1%–3%, triethanolamine 0.5%–0.8%, polycarboxylate superplasticizer 0.3%–0.5%, and the balance being cement.

[0018] This invention also provides a construction method for a barrier wall structure, wherein the barrier wall structure is the aforementioned modular box-type barrier wall structure used for site remediation, and the construction method includes the following steps:

[0019] Step 1: Leveling the site: Remove loose soil from the ground, prepare the site, and create the construction surface;

[0020] Step 2: Measurement and layout: Mark the pre-placement position of the box-type barrier unit;

[0021] Step 3: Excavate the trench: Using a hydraulic trenching machine or a long-arm excavator, excavate the trench at the pre-placement position of the box-type barrier unit marked in Step 2. After the trench is excavated, make mud slurry to protect the trench walls to ensure the stability of the trench.

[0022] Step 4: Injecting sealing material: Use an injection pump to inject the sealing material into each of the box-type barrier units from the injection port. After filling, use the sealing bolts to seal the injection port.

[0023] After the sealing material is injected in step four, the box-type barrier unit filled with the sealing material needs to be stacked vertically in the temporary storage area. Step five will be carried out after the sealing material has solidified.

[0024] Step 5: Assemble the box-type barrier wall structure: Using hoisting machinery and forklifts, connect the inner and outer connecting lock strips on the upper and lower surfaces of the box-type barrier unit to assemble 3 to 4 box-type barrier units into a longitudinal wall, and hoist the assembled longitudinal wall into the trench excavated in Step 3.

[0025] Repeatedly assemble the longitudinal wall, hoist the assembled longitudinal wall into the trench excavated in step three, and connect it with the longitudinal wall already placed in the trench through the inner and outer locking strips on the side of the box-type barrier unit to form a whole barrier wall.

[0026] Step Six: Filling and Covering with Soil: Fill the gaps on both sides of the barrier wall assembled in Step Five with soil until the trench is full. Then fill the top of the barrier wall with 30-50 cm of soil to complete the construction of the barrier wall structure.

[0027] The modular box-type barrier wall structure for site remediation provided by this invention has the following advantages compared with the prior art:

[0028] 1. The wall material of this invention has good uniformity, stable seepage prevention performance, and a permeability coefficient that can reach 1×10⁻⁶. -8 Below cm / s.

[0029] 2. The box-type barrier unit is filled with sealing material, which has good resistance to load deformation after final curing, avoiding the adverse effects of stress concentration.

[0030] 3. The box-type barrier unit is prefabricated in a modular manner in advance and can be quickly assembled on site using connecting lock strips, making construction simple, fast, and easy to install.

[0031] 4. Each side wall of the box-type barrier unit is equipped with three connecting lock strips, and each connecting lock strip is equipped with an expansion strip. This structure not only has good stability, but also provides triple protection against pollutants, resulting in better seepage prevention integrity and sealing.

[0032] 5. The exterior of the box-type barrier unit is made of HDPE high-polyethylene material, which has good corrosion resistance and a long service life.

[0033] 6. This invention is not subject to external environmental constraints, avoiding problems such as decreased seepage prevention performance caused by groundwater in traditional anti-seepage walls. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the elevation of the splicing box-type barrier wall structure provided by the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of the single-frame box-type barrier unit provided by the present invention;

[0037] Figure 3 This is a schematic diagram of the connecting inner locking bar provided by the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of the connecting outer locking strip provided by the present invention;

[0039] Figure 5 This is a side view of the connection part of the two box-type barrier units before vertical splicing provided by the present invention.

[0040] Figure 6 This is a side view of the connection part after the two box-type barrier units are vertically spliced ​​together, as provided by the present invention.

[0041] Figure label:

[0042] 1. Box-type barrier unit; 2. Connecting lock strip; 3. Injection port;

[0043] 21. Connect the inner locking bar; 22. Connect the outer locking bar;

[0044] 211. Groove; 221. Longitudinal connecting part; 222. Hook-shaped connecting part. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0046] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0048] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction. Furthermore, directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the accompanying drawings; therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0050] The following is combined with Figures 1-6 The specific structure of the present invention is described.

[0051] This embodiment provides a modular box-type barrier wall structure for site remediation, such as... Figure 1 As shown, the structure includes multiple box-type barrier units 1. These units 1 are joined horizontally and vertically using connecting strips 2 to form a barrier wall structure. Each box-type barrier unit 1 is filled with sealing material. The box-type barrier units 1 can be prefabricated into modules, filled with sealing material, and then assembled on-site using connecting strips 2 to form a spliced ​​box-type barrier wall structure. This spliced, modular barrier unit approach is simple, convenient, and easy to install. Because the components can be prefabricated modularly, construction is not constrained by environmental factors, resulting in good uniformity of the waterproofing wall and solving the problems of poor waterproofing integrity and low construction efficiency associated with existing construction methods.

[0052] High-density polyethylene (HDPE) geomembrane is a superior material among existing anti-seepage walls, exhibiting excellent corrosion resistance and a long service life. It is primarily used as an auxiliary material in anti-seepage walls; adding a layer of HDPE geomembrane to the wall structure can improve its anti-seepage performance. In this embodiment, HDPE geomembrane is used as the main wall material. The box-type barrier unit 1 is constructed from HDPE geomembrane, welded into a rectangular box structure using a hot welding machine. Figure 2 As shown, an injection port 3 is provided on the top surface of the box-type barrier unit 1. A sealing component, such as a high-density polyethylene sealing bolt, is installed at the injection port 3. Sealing material is injected into the rectangular box structure of the high-density polyethylene geomembrane through the injection port 3. After curing, the box-type barrier unit 1 is formed. Multiple box-type barrier units 1 can be spliced ​​together to form a complete wall. To ensure convenient manufacturing of individual box-type barrier units 1 and facilitate subsequent splicing between them, their dimensions are also standardized. Generally, the width of a box-type barrier unit 1 is 1–3 meters, its height is 3–5 meters, and its thickness is 0.3–0.8 meters. The thickness of the high-density polyethylene geomembrane is 1.5–3 millimeters, and the diameter of the injection port 3 is set to 3 centimeters.

[0053] The assembly of the box-type barrier units 1 is one of the key aspects of the barrier wall structure of this invention. Proper assembly results in a better barrier effect in the final formed barrier wall. In this embodiment, the connecting lock strip 2 includes an inner connecting lock strip 21 and an outer connecting lock strip 22. The inner connecting lock strip 21 is fixed to the lower surface of the box-type barrier unit 1 along the width direction of the box-type barrier unit 1. The inner connecting lock strip 21 is also fixed to one side of the box-type barrier unit 1 along the height direction of the box-type barrier unit 1. The outer connecting lock strip 22 is fixed to the upper surface of the box-type barrier unit 1 along the width direction of the box-type barrier unit 1. The outer connecting lock strip 22 is also fixed to the other side of the box-type barrier unit 1 along the height direction of the box-type barrier unit 1.

[0054] The inner locking strip 21 and outer locking strip 22 on the upper and lower surfaces of the box-type barrier unit 1 are mainly used for vertical splicing, while the inner locking strip 21 and outer locking strip 22 on the two sides of the box-type barrier unit 1 are mainly used for horizontal assembly. The inner locking strip 21 and outer locking strip 22 are connected to form a connecting locking strip 2, which is distributed along the width and height of the box-type barrier unit 1. This makes the connecting locking strip 2 itself a sealing device at the gap between two adjacent box-type barrier units 1, ensuring the complete barrier performance of the final barrier wall.

[0055] In this embodiment, as Figure 4 As shown, the connecting outer locking bar 22 is strip-shaped, and its cross-section consists of a longitudinal connecting portion 221 and hook-shaped connecting portions 222 connected to the top two sides of the longitudinal connecting portion 221; as shown Figure 3As shown, the inner locking strip 21 is also strip-shaped, with a slot 211 inside that matches the shape of the outer locking strip 22. When assembling the box-type barrier unit 1, simply insert the outer locking strip 22 into the slot 211 of the inner locking strip 21 to complete the assembly. The structure is simple and the operation is convenient.

[0056] Since the connecting lock strip 2 itself also needs to have a sealing and barrier function, in this embodiment, both the inner connecting lock strip 21 and the outer connecting lock strip 22 are made of high-density polyethylene, the same material as the outer shell of the box-type barrier unit 1, thus achieving the same barrier effect and uniform anti-seepage performance of the barrier wall. In order to ensure that the surface of the final barrier wall structure is complete without protrusions or concavities, in this embodiment, the inner connecting lock strip 21 is fixed by embedded hot welding on the lower surface and one side of the box-type barrier unit 1, and the outermost part of the inner connecting lock strip 21 is flush with the lower surface or side of the box-type barrier unit 1; the bottom of the longitudinal connecting part 221 of the outer connecting lock strip 22 is hot-welded to the upper surface and another side of the box-type barrier unit 1. The inner locking strip 21 is installed on the box-type barrier unit 1 using an embedded installation method, so that the surface of the box-type barrier unit 1 is a flat structure without protrusions or concave areas. After the outer locking strip 22 and the inner locking strip 21 are connected, two adjacent box-type barrier units 1 can fit tightly together, and the final barrier wall structure is also a whole wall structure.

[0057] To enhance the sealing and barrier effect at the connection, in this embodiment, three sets of inner connecting lock strips 21 are fixed to the lower surface and one side of the box-type barrier unit 1, respectively, and the three sets of inner connecting lock strips 21 are evenly distributed along the thickness direction of the box-type barrier unit 1; three sets of outer connecting lock strips 22 are fixed to the upper surface and another side of the box-type barrier unit 1, respectively, and the three sets of outer connecting lock strips 22 are evenly distributed along the thickness direction of the box-type barrier unit 1. Figure 2 As shown, Figure 2 The image shows three sets of connecting outer locking strips 22 fixed on the upper surface and another side of a box-type barrier unit 1. This structure forms three sets of connecting locking strips 2 between adjacent box-type barrier units 1, creating three sealing and seepage-proof layers. Of course, other numbers of connecting locking strips can be used; more strips result in better seepage prevention. Considering both economy and effectiveness, three sets of connecting locking strips are the most economical and practical. The three sets of connecting locking strips are evenly distributed on the surface of the box-type barrier unit 1, located at the two edges and the center of a plane, with a preferred spacing of 20 cm.

[0058] During the splicing process of the connecting lock strip 2, the inner connecting lock strip 21 and the outer connecting lock strip 22 come into contact with each other. In order to make the contact area better sealed, in this embodiment, an expansion strip is provided on the groove wall of the inner connecting lock strip 211. The expansion strip is a rubber expansion strip that expands when it comes into contact with water. When splicing is required, the expansion strip inside the inner connecting lock strip 21 is wetted with water in advance, and then the inner connecting lock strip 21 and the outer connecting lock strip 22 are spliced ​​together. The expansion strip can expand to 5 to 8 times its own size when it comes into contact with water. After the connecting lock strips are spliced, the expansion strip expands to the surrounding gap space, leaving no gaps, which can achieve good sealing performance.

[0059] In the above embodiments, the box-type barrier unit 1 needs to be filled with sealing material. In this embodiment, the sealing material filled in the box-type barrier unit 1 is made by mixing water and dry powder solid raw materials in a water-cement ratio of 1 to 1.5:1 and then solidifying it. The dry powder solid raw materials include the following substances in mass percentage: bentonite 10% to 20%, polyacrylate 3% to 5%, polyacrylamide 1% to 3%, triethanolamine 0.5% to 0.8%, polycarboxylate superplasticizer 0.3% to 0.5%, and the balance is cement. This sealing material has good resistance to load deformation after final setting, avoiding the adverse effects of stress concentration.

[0060] This invention also provides a construction method for a barrier wall structure, wherein the barrier wall structure is the aforementioned modular box-type barrier wall structure used for site remediation, and the construction method includes the following steps:

[0061] Step 1: Leveling the site: Remove loose soil from the ground, prepare the site, and create the construction surface.

[0062] Step 2: Measurement and layout: Mark the pre-placement position of box-type barrier unit 1.

[0063] Step 3: Excavate the trench: Using a hydraulic trenching machine or a long-arm excavator, excavate the trench at the pre-placement position of the box-type barrier unit 1 marked in Step 2. After the trench is excavated, make mud slurry to protect the trench walls to ensure the stability of the trench.

[0064] Step 4: Injecting sealing material: Use an injection pump to inject the sealing material into each of the box-type barrier units 1 through the injection port 3. After filling, use the sealing bolts to install and seal the injection port 3.

[0065] After the sealing material is injected in step four, the box-type barrier unit 1 filled with the sealing material needs to be stacked vertically in the temporary storage area. Step five will be carried out after the sealing material has solidified.

[0066] Step 5: Assembling the box-type barrier wall structure: Using hoisting machinery and forklifts, the inner locking strips 21 and outer locking strips on the upper and lower surfaces of the box-type barrier unit 1 are used for connection, combined with... Figure 5 and Figure 6 As shown, the inner locking strip 21 and the outer locking strip 22 are spliced ​​together to achieve the splicing of the upper and lower box-type barrier units 1. Three to four box-type barrier units 1 are spliced ​​together to form a longitudinal wall. The spliced ​​longitudinal wall is then hoisted into the trench excavated in step three. The number of box-type barrier units 1 in each single row can be three to four pieces, depending on the design depth. The wall depth should not exceed 20m.

[0067] Repeatedly assemble the longitudinal wall, hoist the assembled longitudinal wall into the trench excavated in step three, and connect it with the longitudinal wall already placed in the trench through the inner locking strip 21 and outer locking strip 22 on the side of the box-type barrier unit 1 to form a whole barrier wall.

[0068] Step Six: Filling and Covering with Soil: Fill the gaps on both sides of the barrier wall assembled in Step Five with soil until the trench is full. Then fill the top of the barrier wall with 30-50 cm of soil to complete the construction of the barrier wall structure.

[0069] In this embodiment, a dry powder solid raw material was prepared by using 17% bentonite, 4% polyacrylate, 3% polyacrylamide, 0.6% triethanolamine, 0.4% polycarboxylate superplasticizer, and 75% cement. This material was then mixed with water at a 1:1 ratio to form a sealing material. The barrier wall was assembled using this method, and the resulting barrier wall structure was tested at multiple locations. The measured permeability coefficient was 0.34 × 10⁻⁶. -8 cm / s~0.78×10 -8 The flow rate is cm / s, the permeability coefficient is disclosed, and the seepage prevention and barrier effect is good.

[0070] The barrier wall structure of this invention is mainly designed to prevent pollution sources caused by groundwater infiltration from spreading to the surrounding area. The excellent barrier effect of this invention can form a barrier curtain around the pollution source, so that this invention is not restricted by the external environment and avoids the problems of reduced seepage prevention performance caused by groundwater in traditional anti-seepage walls.

[0071] In the respect of any aspects not covered in this application, those skilled in the art may make selections as needed, such as adjusting the size of the barrier unit or the formula of the internal sealing material to meet requirements, all of which fall within the protection scope of this application.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular box-type barrier wall structure, characterized in that: It includes multiple box-type barrier units (1), which are connected horizontally and vertically by connecting lock strips (2) to form a barrier wall structure. Each box-type barrier unit (1) is filled with sealing material. The box-type barrier unit (1) is made of high-density polyethylene geomembrane welded into a rectangular box structure. An injection port (3) is provided on the top surface of the box-type barrier unit (1), and a sealing component is installed on the injection port (3). The connecting lock bar (2) includes an inner connecting lock bar (21) and an outer connecting lock bar (22); The inner connecting lock strip (21) is fixed on the lower surface of the box-type barrier unit (1) along the width direction of the box-type barrier unit (1); the inner connecting lock strip (21) is also fixed on one side of the box-type barrier unit (1) along the height direction of the box-type barrier unit (1); the outer connecting lock strip (22) is fixed on the upper surface of the box-type barrier unit (1) along the width direction of the box-type barrier unit (1); the outer connecting lock strip (22) is also fixed on the other side of the box-type barrier unit (1) along the height direction of the box-type barrier unit (1); The connecting outer locking bar (22) is long and its cross-section consists of a longitudinal connecting part (221) and hook-shaped connecting parts (222) connected to the top two sides of the longitudinal connecting part (221); the connecting inner locking bar (21) is also long and its interior has a hole (211) with the same shape as the connecting outer locking bar (22).

2. The modular box-type barrier wall structure according to claim 1, characterized in that: The box-type barrier unit (1) has a width of 1~3 meters, a height of 3~5 meters, and a thickness of 0.3~0.8 meters. The high-density polyethylene geomembrane has a thickness of 1.5~3 millimeters.

3. The modular box-type barrier wall structure according to claim 1, characterized in that: Both the inner locking strip (21) and the outer locking strip (22) are made of high-density polyethylene. The inner locking strip (21) is fixed by hot welding by embedding on the lower surface and one side of the box-type barrier unit (1), and the outermost part of the inner locking strip (21) is flush with the lower surface or side of the box-type barrier unit (1). The bottom of the longitudinal connecting part (221) of the outer locking strip (22) is hot welded to the upper surface and another side of the box-type barrier unit (1).

4. The modular box-type barrier wall structure according to claim 3, characterized in that: Three sets of connecting inner locking strips (21) are fixed on the lower surface and one side of the box-type barrier unit (1), and the three sets of connecting inner locking strips (21) are evenly distributed along the thickness direction of the box-type barrier unit (1); three sets of connecting outer locking strips (22) are fixed on the upper surface and another side of the box-type barrier unit (1), and the three sets of connecting outer locking strips (22) are evenly distributed along the thickness direction of the box-type barrier unit (1).

5. The modular box-type barrier wall structure according to claim 3 or 4, characterized in that: An expansion strip is provided on the groove wall of the hole (211) inside the inner locking bar (21).

6. The modular box-type barrier wall structure according to claim 5, characterized in that: The sealing material filled in the box-type barrier unit (1) is made by mixing water and dry powder solid raw materials in a water-to-solid ratio of 1 to 1.5:1 and then solidifying it. The dry powder solid raw material comprises the following substances in weight percentage: bentonite 10%~20%, polyacrylate 3%~5%, polyacrylamide 1%~3%, triethanolamine 0.5%~0.8%, polycarboxylate superplasticizer 0.3%~0.5%, and the balance being cement.

7. A construction method for a barrier wall structure, characterized in that, The barrier wall structure is the modular box-type barrier wall structure as described in any one of claims 1 to 6, and the construction method includes the following steps: Step 1: Leveling the site: Remove loose soil from the ground, prepare the site, and create the construction surface; Step 2: Measurement and layout: Mark the pre-placement position of the box-type barrier unit (1); Step 3: Excavate trenches: Use a hydraulic trenching machine or a long-arm excavator to excavate trenches at the pre-placed positions of the box-type barrier unit (1) marked in Step 2. After the trenches are excavated, mud slurry is used to protect the walls of the trenches to ensure their stability. Step 4: Injecting sealing material: Use an injection pump to inject the sealing material into each box-type barrier unit (1) through the injection port (3). After filling, use sealing bolts to seal the injection port (3). Step 5: Assemble the box-type barrier wall structure: Using hoisting machinery and forklifts, connect the inner locking strip (21) and outer locking strip (22) on the upper and lower surfaces of the box-type barrier unit (1) to assemble 3-4 box-type barrier units (1) into a longitudinal wall, and hoist the assembled longitudinal wall into the trench excavated in Step 3; Repeatedly assemble the longitudinal wall, hoist the assembled longitudinal wall into the trench excavated in step three, and connect it with the longitudinal wall already placed in the trench through the inner locking strip (21) and outer locking strip (22) on the side of the box-type barrier unit (1) to form the whole barrier wall; Step Six: Filling and Covering with Soil: Fill the gaps on both sides of the barrier wall assembled in Step Five with soil until the trench is full. Then fill the top of the barrier wall with 30-50 cm of soil to complete the construction of the barrier wall structure.

8. The construction method of the barrier wall structure according to claim 7, characterized in that: After the sealing material is injected in step four, the box-type barrier unit (1) filled with the sealing material needs to be stacked vertically in the temporary storage area. Step five will be carried out after the sealing material has solidified.

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