Composite waterstop for sealing nodes of polluted soil blocking system

Abstract

The invention belongs to the technical field of polluted soil treatment, and discloses a composite waterstop for joint sealing of a polluted soil blocking system, the composite waterstop is connected to a connecting seam of two adjacent concrete structures, the two ends of the composite waterstop in the width direction are anchored into the two concrete structures respectively, and the composite waterstop comprises a framework, a sealing strip and a sealing strip, the framework extends along the length direction of the connecting seam; the framework is wrapped with the flexible sealing layer; and the non-woven fabric layer wraps the flexible sealing layer, and an adsorption material is arranged in the non-woven fabric layer so as to be used for adsorbing pollutants in the polluted soil in the long-term contact process with the polluted soil leaking through the connecting seam. The rigid framework provides support, the flexible sealing layer adapts to deformation, the material sealing performance is far better than that of a traditional water-stop belt, and the adsorption material capable of adsorbing pollutants in polluted soil is arranged in the non-woven fabric layer, so that even if trace leakage occurs, the trace leakage can be effectively intercepted, and secondary diffusion is prevented.

Description

Technical Field

[0001] This invention belongs to the field of contaminated soil remediation technology, and specifically relates to a composite waterstop for sealing nodes in a contaminated soil barrier system. Background Technology

[0002] In contaminated soil remediation projects using the "remediation + construction" model, the core technology for preventing pollutant diffusion is the use of diaphragm walls and the foundation slab structure to form a closed physical barrier system. However, weak points in the sealing of this system often appear at various structural nodes, especially at the joints of the diaphragm walls and the connection between the diaphragm walls and the foundation slab.

[0003] In existing technologies, waterstops are typically installed at the joints between two adjacent concrete structures to prevent leakage. Traditional waterstops are generally rubber or steel-edged, providing only basic waterproofing. However, in contaminated soil, especially in environments containing complex chemical components such as heavy metals and organic matter, traditional waterstops are subject to long-term leaching and erosion by pollutants, leading to aging, embrittlement, and loss of elasticity. Furthermore, traditional waterstops may not effectively adapt to deformations caused by foundation settlement or concrete shrinkage, resulting in sealing failure. Therefore, we propose a composite waterstop for sealing joints in contaminated soil barrier systems to address these issues. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a composite waterstop for sealing nodes in contaminated soil barrier systems, which solves the problem that traditional waterstops are susceptible to erosion and aging by pollutants.

[0005] This invention is achieved through the following scheme: a composite waterstop for sealing joints in a contaminated soil barrier system, connected at the joint of two adjacent concrete structures, with both ends of the composite waterstop anchored into the two concrete structures respectively in the width direction; the composite waterstop comprises: A skeleton that extends along the length of the connecting seam; A flexible sealing layer is wrapped around the outside of the skeleton; A non-woven fabric layer, wrapped around the outside of the flexible sealing layer, contains an adsorbent material to adsorb pollutants in the contaminated soil during long-term contact with contaminated soil that leaks through the joint.

[0006] A further improvement of the composite waterstop for sealing nodes in a contaminated soil barrier system is that the skeleton is generally I-shaped, the skeleton includes two oppositely arranged flanges and a web fixedly connected between the two flanges, and the two flanges on the skeleton are respectively anchored into two concrete structures.

[0007] A further improvement of the composite waterstop for sealing nodes in a contaminated soil barrier system is that it also includes a connecting component for strengthening the connection between the flexible sealing layer and the skeleton.

[0008] A further improvement of the composite waterstop for sealing nodes in a contaminated soil barrier system is that the connecting component includes multiple holes and multiple limiting strips. The multiple holes are arranged through the skeleton, and the multiple limiting strips are respectively inserted into the multiple holes, with both ends of each limiting strip connected to the inner wall of the flexible sealing layer.

[0009] A further improvement of the composite waterstop for sealing nodes in a contaminated soil barrier system is that the skeleton is made of corrosion-resistant engineering plastic.

[0010] A further improvement of the composite waterstop for sealing nodes in a contaminated soil containment system is that the flexible sealing layer is made of corrosion-resistant rubber.

[0011] A further improvement of the composite waterstop for sealing nodes in a contaminated soil barrier system of the present invention is that the adsorbent material includes one or more combinations of nano-zero-valent iron materials, iron oxide materials, activated carbon powder, and hydrophobic zeolite.

[0012] A further improvement of the composite waterstop for sealing nodes in a contaminated soil barrier system is that the outer surface of the flexible sealing layer is an irregular curved surface, and the non-woven fabric layer is tightly wrapped around the surface of the flexible sealing layer.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides support through a rigid frame and adapts to deformation through a flexible sealing layer, resulting in material sealing performance far exceeding that of traditional waterstops. Furthermore, the non-woven fabric layer contains adsorbent materials that can absorb pollutants in contaminated soil, effectively intercepting even minor leaks and preventing secondary diffusion, thus greatly enhancing the safety redundancy of the barrier system. Attached Figure Description

[0014] Figure 1 A schematic diagram of the composite waterstop of the present invention anchored within a concrete structure is shown.

[0015] Figure 2 A schematic diagram showing the positions of the holes and limiting strips of the present invention is provided.

[0016] In the diagram: 1. Skeleton; 2. Flexible sealing layer; 3. Non-woven fabric layer; 4. Hole; 5. Limiting strip; 6a. First concrete structure; 6b. Second concrete structure; 7. Connecting joint. Detailed Implementation

[0017] To address the problem of traditional waterstops being susceptible to erosion and aging by contaminants, this invention provides a composite waterstop for sealing joints in contaminated soil barrier systems. The following detailed description, in conjunction with accompanying drawings, provides further illustration of this composite waterstop for sealing joints in contaminated soil barrier systems.

[0018] See Figures 1-2 As shown, a composite waterstop for sealing joints in a contaminated soil containment system is connected at the joint 7 of two adjacent concrete structures, with both ends of the composite waterstop anchored into the two concrete structures in the width direction (see reference). Figure 1 As shown, the two concrete structures are the first concrete structure 6a and the second concrete structure 6b, respectively. The composite waterstop includes: Frame 1, which extends along the length direction of the connecting seam 7; A flexible sealing layer 2 is wrapped around the outside of the skeleton 1; The non-woven fabric layer 3 is wrapped around the outside of the flexible sealing layer 2. The non-woven fabric layer 3 is provided with an adsorbent material to adsorb pollutants in the contaminated soil during long-term contact with the contaminated soil that leaks through the joint 7.

[0019] With the rigid frame 1 providing support and the flexible sealing layer 2 adapting to deformation, the physical sealing performance far exceeds that of traditional waterstops. Furthermore, the non-woven fabric layer 3 contains adsorbent materials that can absorb pollutants in contaminated soil, effectively intercepting even minor leaks and preventing secondary diffusion, thus greatly enhancing the safety redundancy of the barrier system.

[0020] The frame 1 is generally I-shaped and includes two opposing flanges and a web plate fixedly connected between the two flanges. The two flanges on the frame 1 are respectively anchored into two concrete structures.

[0021] By designing the skeleton 1 into an I-shape, initial strength and installation support are provided for the composite waterstop. The flange plates at both ends can greatly enhance the anchorage strength between the composite waterstop and the adjacent concrete structures and extend the seepage path.

[0022] It also includes a connecting component for strengthening the connection between the flexible sealing layer 2 and the skeleton 1.

[0023] The connecting component includes multiple holes 4 and multiple limiting strips 5. The multiple holes 4 are arranged through the frame 1, and the multiple limiting strips 5 are respectively inserted into the multiple holes 4, and both ends of each limiting strip 5 are connected to the inner wall of the flexible sealing layer 2.

[0024] By adopting the above design, the holes 4 on the skeleton 1 are used to cooperate with the limiting strips 5 on the inner wall of the flexible sealing layer 2 to achieve mechanical interlocking, which can strengthen the connection between the flexible sealing layer 2 and the skeleton 1.

[0025] The skeleton 1 is made of corrosion-resistant engineering plastic (HDPE).

[0026] By using HDPE material to make the skeleton 1, it is possible to ensure that the skeleton 1 has excellent weather resistance, chemical corrosion resistance and aging resistance, and a long service life, so as to ensure the stability of the composite waterstop for long-term use.

[0027] The flexible sealing layer 2 is made of corrosion-resistant rubber.

[0028] Furthermore, the corrosion-resistant rubber is a high-strength and high-elasticity rubber, specifically EPDM combined with chloroprene rubber; By adopting the flexible sealing layer 2 designed above, it can adapt to the deformation of the concrete structure by its own deformation and has excellent physical sealing performance.

[0029] The adsorbent material includes one or more combinations of nano-zero-valent iron materials, iron oxide materials, activated carbon powder, and hydrophobic zeolite.

[0030] By adopting the above design, the composite waterstop of this application has excellent chemical corrosion resistance and can resist the erosion of common harmful substances in contaminated soil (such as arsenic, heavy metal ions, and organic matter). It integrates adsorption function to "secondarily capture" trace pollutants that may pass through sealing defects, providing double protection. For example, arsenic is easily adsorbed and co-precipitated by iron-based materials, thereby achieving active capture of arsenic leaking here.

[0031] The outer surface of the flexible sealing layer 2 is irregularly curved, and the non-woven fabric layer 3 is tightly wrapped around the surface of the flexible sealing layer 2.

[0032] By adopting the above design, the flexible sealing layer 2 is the main physical sealing body. Its outer surface is irregularly curved and its cross-section is designed with multiple bulges, which can generate greater contact stress under concrete compression and enhance the sealing effect.

[0033] Specifically, in actual installation and application: When used for diaphragm wall joints, this waterstop can be installed on the end face of the joint box or the already poured section after the trench is cleaned and before the concrete is poured.

[0034] When used for wall-to-base connections, it is pre-embedded at the design elevation of the top of the diaphragm wall, with half of it embedded in the wall and the other half extending horizontally into the foundation pit. When pouring the foundation slab, the concrete of the slab encloses its horizontal portion, forming a sealed connection.

[0035] The composite waterstop of this application is easy to construct, inherits the traditional installation habits of waterstops, does not require changes to the main construction process, and is easy for construction personnel to accept and promote.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A composite waterstop for sealing joints in a contaminated soil containment system, wherein the composite waterstop is connected at the joint between two adjacent concrete structures, and both ends of the composite waterstop are anchored into the two concrete structures respectively in the width direction, characterized in that, The composite waterstop includes: A skeleton that extends along the length of the connecting seam; A flexible sealing layer is wrapped around the outside of the skeleton; A non-woven fabric layer, wrapped around the outside of the flexible sealing layer, contains an adsorbent material to adsorb pollutants in the contaminated soil during long-term contact with contaminated soil that leaks through the joint.

2. The composite waterstop for sealing nodes in a contaminated soil barrier system as described in claim 1, characterized in that, The frame is generally I-shaped, and includes two opposing flanges and a web plate fixedly connected between the two flanges. The two flanges on the frame are respectively anchored into two concrete structures.

3. The composite waterstop for sealing nodes in a contaminated soil barrier system as described in claim 1, characterized in that, It also includes connecting components to strengthen the connection between the flexible sealing layer and the skeleton.

4. The composite waterstop for sealing nodes in a contaminated soil barrier system as described in claim 3, characterized in that, The connecting component includes multiple holes and multiple limiting strips. The multiple holes are arranged through the frame, and the multiple limiting strips are respectively inserted into the multiple holes, with both ends of each limiting strip connected to the inner wall of the flexible sealing layer.

5. The composite waterstop for sealing nodes in a contaminated soil barrier system as described in claim 1, characterized in that, The skeleton is made of corrosion-resistant engineering plastic.

6. The composite waterstop for sealing nodes in a contaminated soil barrier system as described in claim 1, characterized in that, The flexible sealing layer is made of corrosion-resistant rubber.

7. The composite waterstop for sealing nodes in a contaminated soil barrier system as described in claim 1, characterized in that, The adsorbent material includes one or more combinations of nano-zero-valent iron materials, iron oxide materials, activated carbon powder, and hydrophobic zeolite.

8. The composite waterstop for sealing nodes in a contaminated soil barrier system as described in claim 1, characterized in that, The outer surface of the flexible sealing layer is an irregular curved surface, and the non-woven fabric layer is tightly wrapped around the surface of the flexible sealing layer.

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