Transverse connection construction method for geotechnical composite drain boards

Abstract

The invention discloses a transverse connection construction method for geotechnical composite drainage plates. Each geotechnical composite drainage plate comprises geotechnical cloth on the upper layer and a drainage plate on the lower layer. The construction method comprises the steps that the multiple drainage plates are transversely overlapped, laid and calibrated; in any two adjacent drainage plates, the tail end of the upper-layer drainage plate is in lap joint with the head end of the lower-layer drainage plate, and the upper-layer drainage plate boss and the lower-layer drainage plate boss of the lap joint part are buckled in an overlapped mode; in any two adjacent drainage plates, the lap joint parts of the two drainage plates are bonded and fixed; welding and connecting the end part of the upper-layer drainage plate and the joint of the lower-layer drainage plate; and the upper-layer geotechnical cloth above the upper-layer drainage plate and the lower-layer geotechnical cloth above the lower-layer drainage plate are in lap joint and connected in a hot bonding mode. After the treatment, the strength of the transverse connecting area of the geotechnical composite drainage plate is remarkably improved, and the risk of instability separation of upper and lower layers of materials is reduced.

Description

Technical Field

[0001] This invention relates to the field of geotechnical construction technology, specifically to a method for lateral connection construction of geosynthetic drainage boards. Background Technology

[0002] Geocomposite drainage boards are high-performance geosynthetic materials mainly used in rainwater drainage to achieve filtration, drainage and protection functions. They are a highly efficient alternative to traditional sand and gravel drainage layers.

[0003] Compared with traditional drainage materials, geocomposite drainage boards have obvious advantages such as high drainage efficiency, lightweight and high strength, good durability and low cost. At present, they have been used in many landfill projects, mainly as a slope rainwater drainage layer to achieve rapid drainage of rainwater from slopes.

[0004] According to the requirements of GB 51220-2017 "Technical Specification for Ecological Closure of Municipal Solid Waste Sanitary Landfill", a green soil layer should also be set on the drainage layer. However, at present, most geocomposite drainage boards are connected by overlapping and snap-fitting. Due to insufficient connection strength at the transverse connection of the slope geocomposite drainage board, it is subjected to downward pull during the mechanical construction of the green soil layer, which easily causes the upper and lower layers of materials to become unstable and separate, and the entire material to slide and break down. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for constructing transverse connections of geosynthetic drainage boards.

[0006] This invention discloses a method for constructing transverse connections of geocomposite drainage boards, wherein each geocomposite drainage board comprises an upper layer of geotextile and a lower layer of drainage board; the construction method includes: Step 1: Lay and calibrate multiple drainage boards horizontally with overlapping joints; wherein, in any two adjacent drainage boards, the end of the upper drainage board overlaps the head of the lower drainage board, and the protrusions of the upper drainage board and the lower drainage board overlap and fasten together in the overlapping part. Step 2: In any two adjacent drainage boards, glue and fix the overlapping part of the two drainage boards together. Step 3: In any two adjacent drainage boards, weld the ends of the upper drainage board to the joint of the lower drainage board. Step 4: In any two adjacent drainage boards, overlap the upper geotextile above the upper drainage board with the lower geotextile above the lower drainage board, and connect them using a heat-bonding method.

[0007] As a further improvement of the present invention, in any two adjacent drainage boards, the overlap width between the upper drainage board and the lower drainage board is 150mm to 300mm.

[0008] As a further improvement of the present invention, step 2 specifically includes: Step 21: Wipe the overlapping area of ​​the drainage board with a clean cloth to remove oil and dust, and sand the bonding surface with 80-120 grit sandpaper. Then use a clean cloth to remove all dust. Step 22: Apply a layer of chlorinated polyolefin primer to the lower drainage board by spraying or brushing, ensuring uniform thickness and no dripping or accumulation. Step 23: After the chlorinated polyolefin primer has completely dried, apply a layer of organic adhesive to the lower drainage board by dotting or scraping. The organic adhesive is a two-component acrylic structural adhesive or epoxy resin adhesive, and the coating thickness is 0.1~0.3mm. Step 24: According to the positioning and calibration scheme in Step 1, calibrate and install the overlapping area of ​​the upper and lower drainage boards, and use bagged sand to keep them fixed for 5~15 minutes.

[0009] As a further improvement of the present invention, in step 3, the end of the upper drainage board and the joint of the lower drainage board are connected by extrusion welding, and the material of the extrusion welding is HDPE welding rod.

[0010] As a further improvement of the present invention, in step 4, the end of the upper geotextile overlaps the head of the lower geotextile with an overlap width of 150mm to 300mm.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention first involves bonding the overlapping areas of the upper and lower drainage boards together to enhance their connection strength. Then, extrusion welding is used at the joint between the upper and lower drainage boards to further strengthen the connection between the two layers. Finally, the geotextile on the geocomposite drainage board is connected using a thermal bonding method. After these treatments, the strength of the transverse connection area of ​​the geocomposite drainage board is significantly improved, and the risk of instability and separation of the upper and lower materials is reduced. Attached Figure Description

[0012] Figure 1 This is a flowchart of the construction method for transverse connection of geosynthetic drainage boards disclosed in this invention. Figure 2 This is an enlarged schematic diagram of the transverse connection structure of the geosynthetic drainage board disclosed in this invention.

[0013] In the picture: 1. Upper drainage board; 2. Lower drainage board; 3. Upper drainage board boss; 4. Lower drainage board boss; 5. Organic adhesive; 6. Extrusion welded structure; 7. Upper geotextile; 8. Lower geotextile; 9. Thermal bonding structure. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] The present invention will now be described in further detail with reference to the accompanying drawings: like Figure 1 , 2 As shown, this invention provides a method for constructing a transverse connection of geotextile composite drainage boards. Each geotextile composite drainage board includes an upper layer of geotextile fabric and a lower layer of drainage board, the drainage board being formed by spaced-apart protrusions and recesses; the construction method includes: Step 1: Lay and calibrate multiple drainage boards in a horizontal overlapping manner along the slope. Specifically, in the same direction, any two adjacent drainage boards are laid with their ends overlapping, meaning the end of the upper drainage board 1 overlaps the beginning of the lower drainage board 2, and the protrusions 3 and 4 of the upper and lower drainage boards can overlap and interlock. The overlap width L between the upper and lower drainage boards 1 and 2 is 150mm to 300mm. For example, the end of the first drainage board on the left overlaps the beginning of the second drainage board on the left, the end of the second drainage board on the left overlaps the beginning of the third drainage board on the left, and so on.

[0016] Step 2: In any two adjacent drainage boards, glue and fix the overlapping part of the two drainage boards together. Specifically, it includes: Step 21: Wipe the overlapping area of ​​the drainage board with a clean cloth to remove oil and dust, and sand the bonding surface with 80-120 grit sandpaper. Then use a clean cloth to remove all dust. Step 22: Apply a layer of chlorinated polyolefin primer to the lower drainage board by spraying or brushing, ensuring uniform thickness and no dripping or accumulation. Step 23: After the chlorinated polyolefin primer has completely dried, apply a layer of organic adhesive 5 to the lower drainage board 2 by dotting or scraping. The organic adhesive 5 can be a two-component acrylic structural adhesive or epoxy resin adhesive, and the coating thickness is 0.1~0.3mm. Step 24: According to the positioning and calibration scheme in Step 1, calibrate and install the overlapping area of ​​the upper drainage board 1 and the lower drainage board 2, and use bagged sand to keep it fixed for 5~15 minutes.

[0017] Step 3: In any two adjacent drainage boards, the ends of the upper drainage board and the lower drainage board are connected by extrusion welding to form an extrusion welded structure; wherein, the material for extrusion welding is HDPE welding rod.

[0018] Step 4: In any two adjacent drainage boards, overlap the upper geotextile 7 above the upper drainage board 1 with the lower geotextile 8 above the lower drainage board 2, and connect them using a thermal bonding method. The upper drainage board 1 and its upper geotextile 7 constitute the first geocomposite drainage board, and the lower drainage board 2 and its lower geotextile 8 constitute the second geocomposite drainage board. The upper geotextile 7 has the same dimensions as the upper drainage board 1, and the lower geotextile 8 overlaps with the lower drainage board 2. The dimensions of the plates 2 are consistent; the end of the upper geotextile 7 overlaps the head of the lower geotextile 8 and the overlap is connected by thermal bonding to form a thermal bonding structure 9; the overlap width L between the upper geotextile 7 and the lower geotextile 8 is 150mm~300mm; for example, the end of the first geotextile on the left overlaps the head of the second geotextile on the left, the end of the second geotextile on the left overlaps the head of the third geotextile on the left, and so on.

[0019] The advantages of this invention are: This invention uses a special organic adhesive in combination with a chlorinated polyolefin primer to enhance the connection strength of the overlapping area of ​​the drainage boards. Then, extrusion welding is used at the joint between the upper and lower drainage boards to further strengthen the connection strength between the two layers of drainage boards. The geotextile on the geocomposite drainage board is connected by thermal bonding. The above construction method of this invention significantly improves the connection strength in the traditional transverse connection method of geocomposite drainage boards, avoids the problem of breakage and separation of the transverse connection of the geocomposite drainage boards caused by mechanical construction of the upper layer materials on slopes, and reduces the increase in capital and time costs caused by rework.

[0020] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for constructing a transverse connection of geotextile composite drainage boards, wherein each geotextile composite drainage board comprises an upper layer of geotextile and a lower layer of drainage board; characterized in that, The construction method includes: Step 1: Lay and calibrate multiple drainage boards horizontally with overlapping joints; wherein, in any two adjacent drainage boards, the end of the upper drainage board overlaps the head of the lower drainage board, and the protrusions of the upper drainage board and the lower drainage board overlap and fasten together in the overlapping part. Step 2: In any two adjacent drainage boards, glue and fix the overlapping part of the two drainage boards together. Step 3: In any two adjacent drainage boards, weld the ends of the upper drainage board to the joint of the lower drainage board. Step 4: In any two adjacent drainage boards, overlap the upper geotextile above the upper drainage board with the lower geotextile above the lower drainage board, and connect them using a heat-bonding method.

2. The construction method for transverse connection of geosynthetic drainage boards as described in claim 1, characterized in that, In any two adjacent drainage boards, the overlap width between the upper and lower drainage boards is 150mm to 300mm.

3. The construction method for transverse connection of geosynthetic drainage boards as described in claim 1, characterized in that, Step 2 specifically includes: Step 21: Wipe the overlapping area of ​​the drainage board with a clean cloth to remove oil and dust, and sand the bonding surface with 80-120 grit sandpaper. Then use a clean cloth to remove all dust. Step 22: Apply a layer of chlorinated polyolefin primer to the lower drainage board by spraying or brushing, ensuring uniform thickness and no dripping or accumulation. Step 23: After the chlorinated polyolefin primer has completely dried, apply a layer of organic adhesive to the lower drainage board by dotting or scraping. The organic adhesive is a two-component acrylic structural adhesive or epoxy resin adhesive, and the coating thickness is 0.1~0.3mm. Step 24: According to the positioning and calibration scheme in Step 1, calibrate and install the overlapping area of ​​the upper and lower drainage boards, and use bagged sand to keep them fixed for 5~15 minutes.

4. The construction method for transverse connection of geosynthetic drainage boards as described in claim 1, characterized in that, In step 3, the ends of the upper drainage board and the lower drainage board are connected by extrusion welding, and the material for extrusion welding is HDPE welding rod.

5. The construction method for transverse connection of geosynthetic drainage boards as described in claim 1, characterized in that, In step 4, the end of the upper geotextile overlaps the head of the lower geotextile with an overlap width of 150mm to 300mm.

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