Connecting structure for welding HDPE (high-density polyethylene) geomembrane and TPO (thermoplastic polyolefin) geomembrane by adopting middle geomembrane

Abstract

The utility model discloses a connecting structure with HDPE (high-density polyethylene) and TPO (thermoplastic polyolefin) geomembranes welded by a middle geomembrane, which relates to the field of geomembrane seepage prevention and comprises the HDPE geomembrane arranged in an excavation area, the TPO geomembrane arranged in a backfill area and the middle geomembrane arranged between excavation and filling boundaries. A three-dimensional composite drainage net, a lower cushion layer and a cushion layer material are sequentially laid at the bottoms of the three parts from top to bottom; the HDPE geomembrane and the TPO geomembrane are welded to the two sides of the middle geomembrane through double-track welding lines respectively, and the middle geomembrane is prepared by mixing and modifying various high polymer materials and used for generating molecular bonding with the HDPE geomembrane and the TPO geomembrane in a hot melting state and storing after cooling. According to the connecting structure, the middle geomembrane is welded, the problem that two geomembranes cannot be directly welded and cannot be selected at the same time is solved, engineering safety and economical efficiency are greatly improved, and the connecting structure has the advantages of being safe, reliable, simple in structure and convenient to construct.

Description

Technical Field

[0001] The utility model relates to the field of geomembrane anti-seepage, in particular to a connection structure of HDPE and TPO geomembrane welded by intermediate geomembrane. Background Art

[0002] Compared with reinforced concrete and asphalt concrete panels, geomembrane materials have obvious advantages in deformation adaptability. With the continuous development of geomembrane materials, more and more water conservancy, hydropower, landfill and other projects use geomembranes for anti-seepage. Among them, HDPE (polyethylene) geomembrane has excellent properties such as tensile strength, puncture resistance, tear resistance, and impermeability, and is economical, and can be used in excavation areas or low backfill areas; TPO (thermoplastic polyolefin) geomembrane has significantly improved yield elongation, puncture resistance, tear resistance, durability, and construction convenience, but the unit price of geomembrane is relatively expensive, and it can be used in deep backfill areas. Some projects have both excavation areas and backfill areas, and two types of geomembrane materials can be used for anti-seepage.

[0003] In general projects, a concrete connection structure can be set up to anchor the two geomembranes separately on the concrete, but this method has complex construction plans and connection structures, and is prone to leakage channels. Therefore, how to connect the two materials together and ensure anti-seepage safety is an important technology in geomembrane anti-seepage projects. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a connection structure of HDPE and TPO geomembranes using intermediate geomembrane welding, which solves the problem that the two geomembranes cannot be directly welded and cannot be used at the same time, greatly improves the safety and economy of the project, and has the advantages of safety, reliability, simple structure and convenient construction.

[0005] The purpose of the utility model is to achieve the following technical solutions: the HDPE and TPO geomembrane adopts a connection structure welded with an intermediate geomembrane, including a HDPE geomembrane arranged in an excavation area, a TPO geomembrane arranged in a backfill area, and an intermediate geomembrane arranged between the excavation and filling boundaries, and the bottoms of the three are sequentially laid with a three-dimensional composite drainage net, a lower cushion layer, and a cushion material from top to bottom; the HDPE geomembrane and the TPO geomembrane are respectively welded to the two sides of the intermediate geomembrane through a welding structure, and the welding structure adopts a double-track weld. The intermediate geomembrane is made of a variety of polymer materials mixed and modified, and is used to produce molecular bonding with the HDPE geomembrane and the TPO geomembrane in a hot melt state, and survives after cooling.

[0006] As a further technical solution, an air filling hole is reserved in the middle of the double-track weld for weld quality inspection.

[0007] As a further technical solution, drainage pipes are arranged at the bottom of the excavation area. The drainage pipes are arranged horizontally and vertically with a spacing of 20 to 40 meters to connect to the drainage corridor, so as to converge the leaked water into the drainage corridor.

[0008] As a further technical solution, transition material and waste slag material are sequentially filled under the cushion material in the backfill area.

[0009] As a further technical solution, the mass of the upper and lower layers of composite geotextile of the three-dimensional composite drainage net is not less than 200g / ㎡.

[0010] As a further technical solution, the underlying layer uses fine material with a maximum particle size of no more than 2 cm, with continuous grading and a thickness of 10 to 30 cm.

[0011] As a further technical solution, the cushion material is a continuously graded stone material with a maximum particle size of no more than 4 cm and a permeability coefficient greater than 5×10 -3 cm / s.

[0012] The beneficial effects of the utility model are:

[0013] 1. The middle geomembrane is welded with HDPE and TPO geomembranes respectively, eliminating the anchor joint and enhancing the anti-seepage safety performance of the connection part;

[0014] 2. The connection structure is welded with double-track welds, which can quickly detect the weld quality;

[0015] 3. A three-dimensional composite drainage net is laid under the geomembrane on both sides. The weight of the composite geotextile above and below the drainage net is not less than 200g / ㎡. A lower cushion layer and cushion material are set under the three-dimensional composite drainage net. The permeability coefficient of the cushion material must be greater than 5×10-3cm / s;

[0016] 4. Drainage pipes are laid at the bottom of the cushion material in the excavation area and introduced into the drainage corridor. Water collection facilities can be set up at the bottom elevation of the backfill area to collect and monitor the geomembrane leakage and quickly identify the damaged or defective locations of the geomembrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 for Figure 1 A partial enlarged schematic diagram of area A in the middle.

[0019] Explanation of the accompanying drawings: HDPE geomembrane 1, TPO geomembrane 2, intermediate geomembrane 3, welded structure 4, double-track weld 5, inflation hole 6, three-dimensional composite drainage net 7, lower cushion layer 8, cushion material 9, transition material 10, waste material 11, excavation area 12, backfill area 13, drainage flower pipe 14, drainage corridor 15. DETAILED DESCRIPTION

[0020] The utility model will be described in detail below with reference to the accompanying drawings:

[0021] Example: As attached Figure 1 , 2 As shown, this HDPE and TPO geomembrane adopts a connection structure with intermediate geomembrane welding, including HDPE geomembrane 1, TPO geomembrane 2, intermediate geomembrane 3, welding structure 4, double-track weld 5, inflation hole 6, three-dimensional composite drainage net 7, underlying layer 8, cushion material 9, transition material 10, waste material 11, excavation area 12, backfill area 13, drainage flower pipe 14 and drainage gallery 15.

[0022] Reference Figure 1 , TPO geomembrane 2 is often arranged in the backfill area 13 with large deformation, HDPE geomembrane 1 is arranged in the excavation area 12, and the intermediate geomembrane 3 is arranged between the excavation and filling boundary. HDPE geomembrane 1 and TPO geomembrane 2 are respectively welded on both sides of the intermediate geomembrane 3 using double-track welds 5 as welding structures 4. Preferably, the intermediate geomembrane 3 is selected from geomembranes available on the market, such as the composite geomembrane / new geomembrane disclosed in Chinese patent document CN113119566A / CN104153399A, which is made of a variety of polymer materials (including raw materials such as HDPE and TPO geomembrane) mixed and modified, and has a large number of olefin blocks such as octene and hexene, which can produce molecular bonding with HDPE geomembrane 1 and TPO geomembrane 2 in a hot melt state and survive after cooling, so as to be better welded with HDPE geomembrane 1 and TPO geomembrane 2 respectively. An air filling hole 6 is reserved in the middle of the double-track weld 5 for weld quality inspection.

[0023] Further, such as Figure 1 , 2 As shown, a three-dimensional composite drainage net 7, a lower cushion layer 8 and a cushion material 9 are laid from top to bottom at the bottom of the HDPE geomembrane 1, the TPO geomembrane 2 and the intermediate geomembrane 3. The weight of the upper and lower composite geotextiles of the three-dimensional composite drainage net 7 is not less than 200g / ㎡, the lower cushion layer 8 uses fine materials with a maximum particle size of no more than 2cm, and the gradation is continuous, with a thickness of 10 to 30cm, and the cushion material 9 uses continuously graded stone with a maximum particle size of no more than 4cm, and the permeability coefficient is greater than 5×10 -3 cm / s.

[0024] Preferably, drainage pipes 14 are laid at the bottom of the excavation area 12. The drainage pipes 14 are arranged horizontally and vertically in a cross pattern with a spacing of 20 to 40 meters. The drainage pipes 14 can be connected to the drainage corridor 15, so that the leakage water can be collected and directed to the drainage corridor 15. The transition material 10 and the waste slag material 11 are sequentially filled under the cushion material 9 of the backfill area 13. At the same time, water collection facilities can be set at the bottom elevation of the backfill area 13 to collect and monitor the leakage of the geomembrane and quickly identify the location of the damage or defect of the geomembrane.

[0025] The utility model solves the problem that the two commonly used geomembranes cannot be directly welded and cannot be used at the same time by adopting a connection structure for welding an intermediate geomembrane with two commonly used geomembranes (HDPE geomembrane 1 and TPO geomembrane 2), thereby greatly improving the engineering safety and economy.

[0026] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and the concept of the utility model should fall within the protection scope of the claims attached to the utility model.

Claims

1. A connection structure of HDPE and TPO geomembrane using intermediate geomembrane welding, characterized in that: The invention comprises a HDPE geomembrane (1) arranged in an excavation area (12), a TPO geomembrane (2) arranged in a backfill area (13), and an intermediate geomembrane (3) arranged between the excavation and backfill boundaries, wherein a three-dimensional composite drainage net (7), a lower cushion layer (8), and a cushion material (9) are laid in sequence at the bottom of the three from top to bottom; the HDPE geomembrane (1) and the TPO geomembrane (2) are respectively welded to the two sides of the intermediate geomembrane (3) through a welding structure (4), wherein the welding structure (4) adopts a double-track weld (5), and the intermediate geomembrane (3) is used to generate molecular bonding with the HDPE geomembrane (1) and the TPO geomembrane (2) in a hot-melt state and survive after cooling.

2. The connection structure of HDPE and TPO geomembrane welded by intermediate geomembrane according to claim 1 is characterized in that: An air filling hole (6) is reserved in the middle of the double-track weld (5) for testing weld quality.

3. The connection structure of HDPE and TPO geomembrane welded by intermediate geomembrane according to claim 1 is characterized in that: Drainage flower pipes (14) are arranged at the bottom of the excavation area (12). The drainage flower pipes (14) are arranged horizontally and vertically in a cross-arrangement with a spacing of 20 to 40 meters, and are used to connect to the drainage gallery (15), so as to converge the leaked water into the drainage gallery (15).

4. The connection structure of HDPE and TPO geomembrane using intermediate geomembrane welding according to claim 1 is characterized in that: The transition material (10) and the waste slag material (11) are sequentially filled below the cushion material (9) of the backfill area (13).

5. The connection structure of HDPE and TPO geomembrane using intermediate geomembrane welding according to claim 1 is characterized in that: The mass of the upper and lower layers of composite geotextile of the three-dimensional composite drainage net (7) is not less than 200g / ㎡.

6. The connection structure of HDPE and TPO geomembrane using intermediate geomembrane welding according to claim 1 is characterized in that: The underlying layer (8) is made of fine material with a maximum particle size of no more than 2 cm, with continuous grading and a thickness of 10 to 30 cm.

7. The connection structure of HDPE and TPO geomembrane welded by intermediate geomembrane according to claim 1 is characterized in that: The cushion material (9) is a continuously graded stone material with a maximum particle size of no more than 4 cm and a permeability coefficient greater than 5×10 -3 cm / s.

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