Lap joint structure for anchoring HDPE (high-density polyethylene) and TPO (thermoplastic polyolefin) geomembranes through concrete gallery
By laying concrete corridors at the overlapping parts of HDPE and TPO geomembrane and anchoring them, combining SR glue layer and stainless steel bolt anchoring, the connection difficulties caused by material differences are solved, and reliable anti-seepage effect and water leakage monitoring are achieved.
Patent Information
- Application Number
- CN202421725000.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-19
AI Technical Summary
Due to the differences in material properties, HDPE and TPO geomembranes cannot be effectively hot melt welding, which leads to difficulty in connecting in large deformation areas and affects anti-seepage safety.
By laying concrete corridors at the overlapping parts of HDPE and TPO geomembrane, and setting up SR base glue layer, SR slip layer and SR anti-seepage rubber strip layer on the foundation surface of the anchor structure, the geomembrane is anchored on the concrete corridor using stainless steel chemical bolts and angle steel, and leak monitoring is carried out in combination with a three-dimensional composite drainage network and drainage system.
It realizes reliable connection between HDPE and TPO geomembrane, enhances anti-seepage safety, and can quickly identify the location of damaged or defects of geomembrane, improves deformation adaptability and water leakage collection and monitoring capabilities.
Smart Images
Figure CN223135083U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of geomembrane seepage prevention, in particular to an overlapping structure for anchoring HDPE and TPO geomembranes through a concrete gallery. Background Art
[0002] Geomembrane materials have obvious advantages in deformation adaptability compared with the seepage prevention of reinforced concrete and asphalt concrete panels. With the continuous development of geomembrane materials, more and more water conservancy and hydropower projects, landfills and other projects use geomembranes for seepage prevention, and the performance of different geomembranes varies greatly. Most previous projects selected HDPE (high-density polyethylene) geomembranes. HDPE geomembranes have excellent properties such as tensile strength, puncture resistance, tear resistance, and impermeability, and are also economical. With the construction of projects with relatively poor topographic and geological conditions, the requirements for the deformation adaptability of geomembranes are also getting higher and higher. More projects have started to choose PVC (polyvinyl chloride) and TPO (thermoplastic polyolefin) geomembranes, which have significantly improved in terms of yield elongation, puncture resistance, tear resistance, durability, and construction convenience, but the unit price of geomembranes is much more expensive. Due to the uneven quality of domestic materials for PVC geomembranes, few projects currently use them. Therefore, in some projects, TPO materials are selected to replace HDPE geomembranes in areas with large deformations where HDPE materials are difficult to adapt to.
[0003] Due to the difference in material properties between HDPE and TPO geomembranes, the two geomembranes cannot be effectively hot-melt welded. Therefore, how to connect the two materials together and ensure seepage prevention safety is an important technology in the geomembrane seepage prevention project. Summary of the Utility Model
[0004] The purpose of the utility model is to overcome the deficiencies existing in the prior art and provide an overlapping structure for anchoring HDPE and TPO geomembranes through a concrete gallery, which has the advantages of safety and reliability, simple structure, and convenient construction.
[0005] The purpose of the utility model is achieved by the following technical solutions: This overlapping structure for anchoring HDPE and TPO geomembranes through a concrete gallery includes an HDPE geomembrane arranged in the excavation area and a TPO geomembrane arranged in the backfill area. A concrete gallery is arranged at the overlapping part of the two, and both the HDPE geomembrane and the TPO geomembrane are anchored to the concrete gallery through an anchoring structure. On the base surface of each anchoring structure, an SR bottom glue layer, an SR sliding layer, and an SR anti-seepage rubber strip layer are sequentially arranged from bottom to top. An HDPE geomembrane or a TPO geomembrane is laid on the SR anti-seepage rubber strip layer, and an SR bottom glue layer is further coated on the HDPE geomembrane or the TPO geomembrane, and then an SR anti-seepage cover layer and an SR plastic filler layer are sequentially laid.
[0006] As a further technical solution, a three-dimensional composite drainage net, a lower cushion layer and a cushioning material are sequentially arranged below the HDPE geomembrane and the TPO geomembrane on both sides of the concrete corridor. A drain pipe with holes is arranged at the bottom of the cushioning material and is connected to the drain pipe buried in the concrete corridor to introduce the seepage water into the corridor drainage ditch for collection and monitoring.
[0007] As a further technical solution, the SR bottom glue layer and the SR sliding layer of the anchoring structure extend and cover the concrete corridor. After filling the SR plastic filler layer, it is protected by the extended SR anti-seepage cover sheet layer.
[0008] As a further technical solution, the concrete corridors on both sides of the anchoring structure are cast into gentle slopes, and a fine material lower cushion layer is locally filled.
[0009] As a further technical solution, the HDPE geomembrane and the TPO geomembrane are respectively anchored to the concrete corridor with chemical bolts and angle steels.
[0010] As a further technical solution, the edge of the anchoring structure is sealed with an elastic edge sealer.
[0011] As a further technical solution, the concrete corridor is arranged in the cut-fill boundary or other areas with deformation differences.
[0012] The beneficial effects of the utility model are as follows:
[0013] 1. By setting the concrete corridor, it can not only provide the anchoring structure for the two geomembranes, but also collect and monitor the seepage water of the geomembranes to quickly identify the positions of geomembrane damage or defects;
[0014] 2. The geomembranes are anchored to the concrete corridor structure with stainless steel chemical bolts and stainless steel angle steels. The angle steel has high rigidity and the chemical bolts have large anchoring force. The anchoring force of the bolts can be evenly transmitted to the angle steel, which can have a good pressing effect on the geomembranes and ensure the reliability of the connection between the geomembranes and the concrete corridor structure;
[0015] 3. The surface anti-seepage cover sheets of the two geomembrane anchoring structures extend and cover the corridor, separating the concrete corridor from the reservoir water and enhancing the anti-seepage safety performance of the anchoring structure part;
[0016] 4. The overlapping part of the corridor and the geomembrane is cast into a gentle slope, and a lower cushion layer of fine material with a maximum particle size less than 2 cm is locally filled. A three-dimensional composite drainage net is laid below the two-side geomembranes. The quality of the composite geotextile on both sides of the drainage net is not less than 200 g / ㎡. A lower cushion layer and a cushioning material are arranged below the three-dimensional composite drainage net. The permeability coefficient of the cushioning material needs to be greater than 5×10-3 cm / s. A drain pipe with holes is laid at the bottom of the cushioning material and introduced into the concrete drainage corridor. Description of the Drawings
[0017] Figure 1This is a schematic structural diagram of the present utility model.
[0018] Figure 2 This is a partially enlarged schematic structural diagram of the anchoring structure in the present utility model.
[0019] Explanation of reference numerals: HDPE geomembrane 1, TPO geomembrane 2, concrete corridor 3, anchoring structure 4, SR bottom glue layer 5, SR sliding layer 6, SR anti-seepage rubber strip layer 7, SR anti-seepage cover sheet layer 8, SR plastic filler layer 9, chemical bolt 10, angle steel 11, drain pipe with holes 12, drain pipe 13, cushioning material 14, lower cushion 15, three-dimensional composite drainage net 16, elastic edge sealer 17. Detailed implementation manners
[0020] The following will introduce the present utility model in detail with reference to the accompanying drawings:
[0021] Embodiment: As shown in the attached Figure 1 、 2 figures, this lap joint structure for anchoring HDPE and TPO geomembranes through a concrete corridor includes HDPE geomembrane 1, TPO geomembrane 2, concrete corridor 3, anchoring structure 4, SR bottom glue layer 5, SR sliding layer 6, SR anti-seepage rubber strip layer 7, SR anti-seepage cover sheet layer 8, SR plastic filler layer 9, chemical bolt 10, angle steel 11, drain pipe with holes 12, drain pipe 13, cushioning material 14, lower cushion 15, three-dimensional composite drainage net 16 and elastic edge sealer 17.
[0022] Referring to the attached Figure 1 、 2 figures, the HDPE geomembrane 1 and the TPO geomembrane 2 are anchored to the concrete corridor 3 through the anchoring structure 4. Preferably, the TPO geomembrane is often arranged in the backfill area with large deformation, and the HDPE geomembrane is arranged in the excavation area. The two geomembranes are respectively anchored to the concrete corridor 3 (arranged at the lap joint of the HDPE geomembrane 1 and the TPO geomembrane 2) by stainless steel chemical bolts 10 and stainless steel angle steel 11.
[0023] First, the base surface of each anchoring structure 4 is polished flat, and then the SR bottom glue layer 5 is applied. The width of the SR bottom glue layer 5 exceeds the anchoring part by 5 - 10 cm; then the SR sliding layer 6 is laid, with a thickness of about 6 mm. The SR anti-seepage rubber strip layer 7 is laid on the SR sliding layer 6, and the material surface of the SR anti-seepage rubber strip layer 7 faces upwards, with a width of about 10 cm and a thickness of about 6 mm. The HDPE geomembrane 1 or the TPO geomembrane 2 is laid on the SR anti-seepage rubber strip layer 7 in sequence, and the SR bottom glue layer 5 is applied again, and the SR anti-seepage cover sheet layer 8 and the SR plastic filler layer 9 are laid in sequence. Then, it is anchored by stainless steel angle steel 11 and stainless steel chemical bolts 10, and the anchoring spacing is 30 - 45 cm. The edge of the anchoring structure 4 is sealed with the elastic edge sealer 17.
[0024] The two SR base glue layers 5 and SR sliding layers 6 of the anchoring structure 4 extend and cover the concrete corridor 3. After filling the SR plastic filler layer 9, the extended SR anti-seepage cover sheet layer 8 is used for protection. The concrete corridors 3 on both sides of the anchoring structure 4 are cast into gentle slopes, and a fine material lower cushion layer 15 is locally filled. The concrete corridor 3 is arranged in the excavation and filling boundary or other areas with deformation differences, which can not only play the role of geotextile membrane anchoring, but also take into account the functions of geotextile membrane leakage monitoring and drainage.
[0025] Furthermore, a three-dimensional composite drainage net 16, a lower cushion layer 15 and a cushion material 14 are sequentially arranged below the HDPE geomembrane 1 and the TPO geomembrane 2 on both sides of the concrete corridor 3, mainly to protect the geomembrane and play the role of leakage drainage. A drainage perforated pipe 12 is laid at the bottom of the cushion material 14. The drainage perforated pipes are arranged horizontally and vertically in a crisscross pattern with a spacing of 20 - 40 m. The drainage perforated pipe 12 is connected to the drain pipe 13 buried in the concrete corridor 3. The spacing of the drain pipes 13 is 2 - 4 m, and the seepage water is introduced into the drainage ditch of the concrete corridor 3 for collection and monitoring.
[0026] Preferably, the mass of the upper and lower composite geotextiles of the three-dimensional composite drainage net 16 is not less than 200 g / ㎡. The lower cushion layer 15 is made of fine materials with a maximum particle size not greater than 2 cm, and has a continuous gradation with a thickness of 10 - 30 cm. The cushion material 14 is continuously graded stone with a maximum particle size not greater than 4 cm, and the permeability coefficient is greater than 5×10 -3 cm / s.
[0027] The working process of the present utility model: During layout, the base surface of the anchoring structure 4 is first polished flat, and then the SR base glue layer 5 is painted with a width exceeding the anchoring part by 5 - 10 cm; the SR sliding layer 6 is laid with a thickness of about 6 mm; then an SR anti-seepage rubber strip layer 7 is laid on top, with the SR material facing upwards, a width of about 10 cm and a thickness of about 6 mm; then the HDPE geomembrane 1 or the TPO geomembrane 2 is laid in sequence, and the SR base glue layer 5 and the SR anti-seepage cover sheet layer 8 are painted. Then it is anchored by stainless steel angle steel 11 and stainless steel chemical bolts 10, and the anchoring spacing is 30 - 45 cm. The edge of the anchoring structure 4 is sealed with an elastic edge sealer 17.
[0028] It can be understood that for those skilled in the art, any equivalent replacement or change to the technical solution and the inventive concept of the present utility model should fall within the protection scope of the appended claims of the present utility model.
Claims
1. A lapping structure for anchoring HDPE and TPO geomembranes through a concrete corridor, characterized in that: It includes an HDPE geomembrane (1) arranged in the excavation area and a TPO geomembrane (2) arranged in the backfill area. A concrete corridor (3) is arranged at the overlapping part of the two. The HDPE geomembrane (1) and the TPO geomembrane (2) are both anchored to the concrete corridor (3) through an anchoring structure (4). An SR bottom glue layer (5), an SR sliding layer (6) and an SR anti-seepage rubber strip layer (7) are sequentially arranged from bottom to top on the base surface of each anchoring structure (4). The HDPE geomembrane (1) or the TPO geomembrane (2) is laid on the SR anti-seepage rubber strip layer (7), and the SR bottom glue layer (5) is painted on the HDPE geomembrane (1) or the TPO geomembrane (2), and then an SR anti-seepage cover sheet layer (8) and an SR plastic filler layer (9) are sequentially laid.
2. The lap joint structure of the HDPE and TPO geomembranes anchored by a concrete corridor according to claim 1, wherein: A three-dimensional composite drainage net (16), a lower cushion layer (15) and cushioning material (14) are sequentially arranged at the lower part of the HDPE geomembrane (1) and the TPO geomembrane (2) on both sides of the concrete corridor (3). A drain pipe with holes (12) is arranged at the bottom of the cushioning material (14). The drain pipe with holes (12) is connected to a drain pipe (13) buried in the concrete corridor (3) to introduce the seepage water into the corridor drainage ditch for collection and monitoring.
3. The overlapping structure of the HDPE and TPO geomembranes anchored by a concrete corridor according to claim 2, characterized in that: The SR bottom glue layer (5) and the SR sliding layer (6) of the anchoring structure (4) extend and cover the concrete corridor (3). After filling the SR plastic filler layer (9), it is protected by the extended SR anti-seepage cover sheet layer (8).
4. The lapping structure of the HDPE and TPO geomembranes anchored through a concrete gallery according to claim 3, characterized in that: The concrete corridors (3) on both sides of the anchoring structure (4) are poured into gentle slopes, and a fine material lower cushion layer (15) is locally filled.
5. The lap joint structure of HDPE and TPO geomembranes anchored by a concrete corridor according to claim 1, characterized in that: The HDPE geomembrane (1) and the TPO geomembrane (2) are respectively anchored to the concrete corridor (3) with chemical bolts (10) and angle steels (11).
6. The overlapping structure of the HDPE and TPO geomembranes anchored by a concrete gallery according to claim 1, characterized in that: The edge of the anchoring structure (4) is sealed with an elastic edge sealer (17).
7. The overlapping structure of HDPE and TPO geomembranes anchored by a concrete corridor according to claim 1, characterized in that: The concrete corridor (3) is arranged at the excavation and filling boundary or other areas with deformation differences.