WO2020093551A1 - Procédé de construction de géomembrane - Google Patents

Procédé de construction de géomembrane Download PDF

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Publication number
WO2020093551A1
WO2020093551A1 PCT/CN2018/122438 CN2018122438W WO2020093551A1 WO 2020093551 A1 WO2020093551 A1 WO 2020093551A1 CN 2018122438 W CN2018122438 W CN 2018122438W WO 2020093551 A1 WO2020093551 A1 WO 2020093551A1
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WIPO (PCT)
Prior art keywords
geomembrane
welding
test
weld
construction
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PCT/CN2018/122438
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English (en)
Chinese (zh)
Inventor
王洋
齐长青
刘勇
罗彬�
田素芳
黄志亮
郝海靖
张道利
郎洁
Original Assignee
北京高能时代环境技术股份有限公司
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Publication of WO2020093551A1 publication Critical patent/WO2020093551A1/fr

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/006—Sealing of existing landfills, e.g. using mining techniques

Definitions

  • This application relates to the technical field of construction methods of anti-seepage materials, in particular to a construction method of geomembrane.
  • geomembrane As a commonly used anti-seepage material, geomembrane is mainly used as an anti-seepage structure in the landfill project. Therefore, the construction quality of the geomembrane will affect the anti-seepage effect of the entire project.
  • the construction of the geomembrane includes the following steps: laying, welding, and acceptance procedures. Due to the lack of perfect geomembrane construction methods and inspection standards, the construction quality of the geomembrane cannot be guaranteed, and the anti-seepage construction The quality problems frequently occurred, which seriously affected the anti-seepage effect of the overall project.
  • the purpose of this application is to provide a construction method of geomembrane to solve the following technical problems in the prior art: due to the lack of perfect geomembrane construction methods and inspection standards, the construction quality of geomembrane cannot be guaranteed, thereby affecting the overall The anti-seepage effect of the project.
  • a construction method of geomembrane provided by this application includes:
  • test welding result meets the set requirements, perform a welding operation on the geomembrane to achieve the welding of the geomembrane on the construction surface.
  • step S200 includes:
  • the environmental welding temperature ⁇ of the geomembrane sample has a value range of 5 ° C ⁇ ⁇ 40 ° C.
  • step S203 when the shear strength and peel strength test of the welded seam are performed on the geomembrane sample after the test welding, it is checked whether the geomembrane sample is torn.
  • step S500 a double-seam hot-melt welding is adopted at the strip connection between two adjacent geomembranes
  • the steps of the double-seam hot melt welding include:
  • step S500 a single-seam extrusion welding is used at the intersection of the connections between the multiple pieces of geomembrane;
  • the steps of single-slot extrusion welding include:
  • the surface of the geomembrane weld at a width of 30 mm to 40 mm is subjected to roughening treatment, and it is checked whether the depth of roughening is less than 10% of the film thickness.
  • the value of the thickness of the center of the weld is 2.5 times the value of the thickness of the film, and the value of the thickness of the center of the weld is between 3 mm and 5 mm.
  • the welded seam needs to be roughened to check whether the length of the roughened is greater than 50mm, and when it is detected that the length of the roughened is greater than 50mm, lap welding is performed.
  • step S100 it also includes a grassroots inspection step
  • the base layer inspection step it is checked whether the surface depth of the construction surface is within a distance of 25 mm to 30 mm for the presence of debris that damages the geomembrane.
  • step S500 also includes non-destructive testing and destructive testing of the weld seam:
  • This application provides a construction method of geomembrane, first laying the geomembrane on the construction surface to limit the location of the geomembrane; conducting a test welding operation on the paved geomembrane and testing the local geomembrane samples Welding, in order to detect the test welding results; and then test the results of the test welding, when the test welding results do not meet the set requirements, indicating that the test welding results of the geomembrane sample can not meet the requirements, you need to re-adjust the welding parameters, in order to Timely feedback of test welding results; when the test welding results meet the set requirements, it indicates that the test welding results of the geomembrane samples can meet the requirements, and the welding operation can be performed directly on the geomembrane, so that the geomembrane is accurately welded on the construction surface , Completed the welding process of geomembrane.
  • the construction method of the geomembrane of the present application has rigorous procedures and simple operation, which can effectively guarantee the construction quality, reduce material
  • FIG. 1 is a flowchart of a construction method of a geomembrane provided by an embodiment of this application.
  • connection should be understood in a broad sense, for example, it can be fixed connection or detachable Connected, or connected integrally; either mechanically or electrically; directly connected, or indirectly connected through an intermediary, or internally connected between two components.
  • installation should be understood in a broad sense, for example, it can be fixed connection or detachable Connected, or connected integrally; either mechanically or electrically; directly connected, or indirectly connected through an intermediary, or internally connected between two components.
  • FIG. 1 is a flowchart of a construction method of a geomembrane provided by an embodiment of this application.
  • the geomembrane of the present application is polyvinyl chloride geomembrane, polyethylene geomembrane, ethylene / vinyl acetate copolymer geomembrane, ethylene vinyl acetate modified asphalt blend geomembrane, linear low density polyethylene geomembrane Any of them.
  • the construction method for geomembrane provided by this application includes the following steps in this order: grass-roots inspection, field measurement, laying, test welding, test welding result detection, welding, and inspection acceptance.
  • step S100 a grassroots inspection step is required
  • the construction surface should be inspected before the construction of the geomembrane, whether the surface of the construction surface is smooth and uneven, and whether the surface depth of the construction surface is within a distance of 25mm to 30mm
  • debris that damage the geomembrane include hard debris, spiked particles and harmful debris.
  • the construction surface needs to be measured on the spot to determine the working surface of the site construction, and the laying area of the geomembrane should be rationally planned to avoid the measurement of the size during construction. Too many geomembrane materials are laid, resulting in material loss.
  • flammable and explosive substances include: matches, lighters, chemical solvents, etc.
  • the geomembrane coil will cause adhesion.
  • the geomembrane check whether there is adhesion on the surface of the geomembrane to ensure that the surface of the geomembrane is smooth. No sticking.
  • step S200 includes:
  • the welding temperature, welding speed and other parameters of the welder are set according to experience to make it in the best working state to ensure the quality of the weld of the geomembrane.
  • the width * length of the geomembrane sample is 300mm * 600mm.
  • the environmental welding temperature ⁇ of the geomembrane sample has a value range of 5 ° C ⁇ ⁇ 40 ° C.
  • the ambient temperature is higher than 40 °C or the ambient temperature is lower than 5 °C, it is not conducive to the welding of the weld and affects the quality of the welding. Therefore, the ambient temperature during welding must be strictly controlled.
  • the above test conditions are: the temperature of the welding environment is 25 ° C, and the welding speed of the welding machine is 50 mm / min.
  • step S203 when the shear strength and peel strength test of the welded seam are performed on the geomembrane sample after the test welding, it is checked whether the geomembrane sample is torn.
  • the geomembrane sample When testing the shear strength and peel strength of the geomembrane sample after the test welding, the geomembrane sample can only be torn and no damage to the weld joint can occur. Once the weld joint is damaged, a detailed record should be made.
  • step S202 is repeated until the test value is higher than the above-mentioned shear strength value.
  • step S202 is repeated until the test value is higher than the above peel strength value.
  • the welding temperature and welding speed of the welding machine should be adjusted in time to ensure that the weld quality can meet the specified requirements.
  • step S500 is executed.
  • test welding result meets the set requirements, perform a welding operation on the geomembrane to achieve the welding of the geomembrane on the construction surface.
  • the strip connection between two adjacent geomembranes that is, the welding area of a larger area is double-seam hot-melt welding; at the intersection of the connections of multiple geomembranes, that is At the welding area of smaller area, single-squeeze extrusion welding is adopted.
  • test welding of geomembrane is required.
  • step S500 a double-seam hot-melt welding method is adopted for the strip connection between two adjacent geomembranes
  • the steps of the double-seam hot melt welding include:
  • the welding staff pays close attention to the condition of the weld and adjusts the welding speed of the welder at any time according to the quality of the weld to ensure the quality of the weld;
  • Welding personnel should also pay attention to keeping the weld seam straight and tidy, and adopt countermeasures for the uneven part under the membrane as early as possible to avoid affecting the welding operation of the welding machine.
  • the value range of the power supply voltage of the welding machine is within 220V ⁇ 11V. Once the value range of the power supply voltage is not within the above range, the machine should be shut down for maintenance work in time to ensure the safety of the welding machine.
  • step S500 a single-seam extrusion welding method is used at the intersection of the connections between the multiple pieces of geomembrane;
  • the steps of single-slot extrusion welding include:
  • the hot air gun is used to bond the overlapping parts of the geomembrane, and the interval of the bonding points ranges from 60mm to 80mm.
  • the temperature of the hot air needs to be controlled to avoid scalding the geomembrane , So that the geomembrane will not tear easily;
  • the surface of the geomembrane weld at the width of 30mm to 40mm is treated with a sanding machine to make it thoroughly cleaned, forming a rough surface, and increasing the contact area; when sanding, it should be operated gently, less Damage the membrane surface, and finally, check whether the depth of roughening is less than 10% of the membrane thickness.
  • step S505 when welding, the head of the welding machine is aligned with the seam, and no phenomenon such as sliding welding or jump welding can occur;
  • the value of the thickness of the center of the weld is 2.5 times the value of the thickness of the film, and the thickness of the center of the weld is in the range of 3 mm to 5 mm to ensure the firmness of the welding position.
  • the welded seam should be deburred to check whether the length of deburring is greater than 50mm.
  • the length of deburring is greater than 50mm, lap welding is performed to ensure the quality of the welding position.
  • the electrode used should be kept clean and dry before being inserted into the welding machine. It is not allowed to use oily or dirty gloves, rags, cotton yarn, etc. to wipe the electrode.
  • the weld seam is cooled in time according to the ambient temperature.
  • the work of the working group is centered on the welding staff and closely cooperates.
  • the deburring process is prior to welding, but it should not be exceeded.
  • the extruded solder must be cooled in time, and the electrode delivery should be adapted to the welding speed.
  • step S500 also includes non-destructive testing and destructive testing of the weld seam:
  • Non-destructive testing refers to the use of electric spark detectors and air pressure detectors to detect whether there are leaks in the weld.
  • the detection method of the electric spark detector is to use the characteristics of the geomembrane as an electrical insulator.
  • the instrument scans to the part with holes and the ground, or the part with pores and the ground, a bright electric spark is generated.
  • the diameter range is embedded in advance Between the thin copper wires, so that after the welding is completed, the thin copper wires are connected to the power supply and scanned with a 35kV high-voltage pulse power probe at a height of about 10mm to 30mm from the weld; It means that the quality of the weld is qualified. When there is a spark, it means that the weld is not tight at this part, and it needs to be reworked and rectified before re-testing.
  • the detection method of the air pressure detector is to seal the two ends of the weld seam of the geomembrane to be detected, connect the air pressure tester, insert the needle into one end of the cavity, and pressurize the weld air cavity to 250kPa with the air pressure tester. Maintain for 3 to 5 minutes, the air pressure should not be lower than 240kPa, and then deflate the hole at the other end of the weld, the pointer of the air pressure gauge of the air pressure tester can quickly return to zero, indicating that the test is qualified.
  • Destructive testing refers to cutting a piece of geomembrane after welding and testing the strength of the sheared geomembrane with an electric tensile tester.
  • the detection method is the same as the detection method of the above-mentioned geomembrane sample test welding.
  • first of all check the laying of the geomembrane to meet the requirements of laying the geomembrane, measure the site on the spot, confirm the construction site on the site, and plan the construction area reasonably, and lay the geomembrane according to the plan; Before welding, take a 300mm ⁇ 600mm geomembrane sample for test welding. After the test welding is completed, the shear strength and peel strength of the weld are tested on an electric tensile tester. If the shear strength and peel strength are not satisfied The specified value will re-determine the parameters of the welding machine until the weld test value can reach the specified value. If the detected shear strength and peel strength meet the specified values, the parameters of the welding machine will be locked.
  • the test welding result Record large-area geomembrane adopts double-seam hot-melt welding.
  • the lap width of the geomembrane is 100mm ⁇ 20mm.
  • the membrane surface in the range of about 200mm should be cleaned with a wet rag Wipe off dust and dirt to keep this part clean and dry.
  • the overlap width of the geomembrane weld is 75mm ⁇ 20mm.
  • the membrane surface of the joint should be flat and moderately tight, so as not to form a fish mouth
  • the folds of the geomembrane are bonded by a hot air gun.
  • the spacing of the bonding points is between 60mm and 80mm.
  • the temperature of the hot air is controlled.
  • the geomembrane should not be scalded.
  • the geomembrane cannot be easily torn apart.
  • the geomembrane is welded.
  • the film surface within the width of 30mm ⁇ 40mm at the seam is smoothed with a sanding machine to make it thoroughly cleaned to form a rough surface and increase its contact area, but its depth should not exceed 10% of the film thickness.
  • the construction method of the geomembrane provided in this application after the grassroots inspection, also carried out on-site measurement of the laying site, construction planning, and reasonable laying of geomembrane lap, effectively reducing the loss of geomembrane materials.
  • geomembrane Before welding, geomembrane adjusts the optimal parameters of the equipment by trial welding, so that the welding equipment is in the best working state, avoiding the weld quality problems caused by the poor equipment status during the welding process, and improving the construction quality of the weld. .
  • This application can be applied not only to the construction of geomembrane in landfills, but also to the construction of geomembrane in various anti-seepage pits, such as ditches.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
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  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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Abstract

L'invention concerne un procédé de construction de géomembrane, qui se rapporte au domaine technique des procédés de construction de matériau anti-infiltration. Le procédé de construction de géomembrane comprend les étapes suivantes : S100, pose d'une géomembrane sur une surface de construction ; S200, réalisation d'un soudage d'essai sur la géomembrane posée ; S300 détection d'un résultat du soudage d'essai ; S400 lorsque le résultat du soudage d'essai ne satisfait pas aux exigences définies, procéder à un nouveau réglage des paramètres de soudage et répéter l'étape S200 ; et S500 lorsque le résultat du soudage d'essai satisfait aux exigences définies, effectuer une opération de soudage sur la géomembrane de façon à souder la géomembrane à la surface de construction. La présente invention résout les problèmes selon lesquels, lorsqu'une géomembrane est construite au moyen de la pose, du soudage et des essais, la qualité de construction de la géomembrane ne peut pas être garantie et l'effet anti-infiltration de l'ensemble du projet est affecté en raison de l'absence de procédés de construction parfaits et de normes d'essai. La géomembrane posée est d'abord soumise à un soudage d'essai, puis le résultat du soudage d'essai est détecté et la géomembrane est soumise à un soudage lorsque ledit résultat satisfait aux exigences définies, garantissant la qualité de soudage de la géomembrane et améliorant l'effet anti-infiltration de la géomembrane.
PCT/CN2018/122438 2018-11-06 2018-12-20 Procédé de construction de géomembrane WO2020093551A1 (fr)

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CN201811315940.4A CN109183854A (zh) 2018-11-06 2018-11-06 土工膜的施工方法
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CN110435158B (zh) * 2019-07-02 2021-08-17 中铁十局集团第五工程有限公司 一种用于储水池的复合土工膜焊接施工方法
CN111516268A (zh) * 2020-04-13 2020-08-11 中建三局集团有限公司 一种用于垃圾填埋场hdpe土工膜的焊接及检测工艺
CN113733572B (zh) * 2021-10-13 2022-09-02 广州市市政工程机械施工有限公司 一种新旧防渗膜交接处焊接的施工工艺及其应用
CN116427726B (zh) * 2023-06-09 2023-09-05 北京高能时代环境技术股份有限公司 一种圆柱体混凝土内壁防渗嵌钉土工膜的安装方法
CN116411717A (zh) * 2023-06-09 2023-07-11 北京高能时代环境技术股份有限公司 一种嵌钉土工膜的施工方法

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