A method for laying and pressing a geotextile

Abstract

The application provides a method for laying and protecting geotextile on slope, which comprises the following steps: pre-processing geotextile; binding one side edge of each piece of geotextile to a pipe material, and winding the geotextile on the pipe material after binding; laying the geotextile; leaving a preset width of geotextile on the top of the dam, and pressing a weight on the preset width of geotextile; driving the pipe material to slowly roll along the slope surface to the water, and manually unfolding the geotextile to ensure that the surface is flat and wrinkle-free; pressing the geotextile on the mud surface; thus, the construction of one piece of geotextile is completed; repeating the above steps to lay multiple pieces of geotextile along the slope surface in the transverse direction, and overlapping the adjacent two pieces of geotextile, and pressing the overlapping area with a weight; and pressing the area from the slope foot to the slope shoulder of the geotextile with a pressing material.

Description

Technical Field

[0001] This invention relates to the field of waterway engineering, specifically to a method for laying and pressing geotextiles on slopes. Background Technology

[0002] Conventional geotextile filter layer laying mainly uses ships or cranes for installation, followed by sandbag or bagged gravel ballast for ballast. The geotextile is then laid using its own weight. However, this method is problematic because sandbags or bagged gravel are difficult to control during descent, leading to wrinkles in the geotextile and difficulty in achieving a tight fit with the slope. Furthermore, in enclosed environments, ship deployment is difficult and costly. Cranes occupy construction roads, impacting subsequent work and posing significant safety risks due to overlapping construction activities. The conventional method of ballast layer ballast ... Summary of the Invention

[0003] The purpose of this invention is to provide a more efficient and economical method for laying and tamping geotextile filter layers on slopes. Considering the stringent requirements of my country's land reclamation projects regarding the construction environment, and to enhance the tamping effect of geotextiles, this invention proposes a method that utilizes fixed steel pipes or PVC pipes (filled with sand or concrete in the middle to increase weight) for laying with divers, and uses ton bags to cover the surface of the geotextile with sand or cohesive soil for tamping.

[0004] The inventive concept of this invention is as follows: Considering that conventional slope geotextile laying and pressing have difficulties in ensuring the laying and pressing effect, and that geotextile is prone to floating under the action of wind, waves and tides, resulting in mud leakage during later filling construction and high maintenance costs, this method considers laying geotextile by wrapping it around a fixed steel pipe or PVC pipe. Utilizing the self-weight of the steel pipe or PVC pipe, the geotextile can better fit the slope surface during the laying process, reducing the probability of wrinkles. During the laying process, the underwater part is mainly handled by divers, who can check and work simultaneously, thereby improving the quality and efficiency of geotextile laying.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for laying and pressing geotextile on slopes, comprising the following steps:

[0006] S1. Pre-processing geotextile: Unroll the geotextile in the work area, cut it to the required size according to the construction requirements, sew the cut geotextile to form multiple geotextiles, tie one edge of each geotextile to a pipe, and then wrap the geotextile around the pipe.

[0007] S2. Laying geotextile: Take a piece of geotextile and leave a geotextile of a predetermined width on the top of the embankment. The predetermined width is measured from the edge of the geotextile opposite to the edge of the tied pipe to the edge of the slope shoulder. Press down a weight on the geotextile of the predetermined width. The weights are arranged in rows along the axial direction of the geotextile on the top of the embankment.

[0008] The pipes are used to slowly roll the geotextile down the slope into the water. With manual assistance, the geotextile is fully unfolded and laid flat on the slope to ensure that there are no wrinkles on the surface. A certain width of geotextile needs to be left on the mud surface below the water surface for placing heavy objects on it.

[0009] S3. Pressing the geotextile: Pressing the geotextile on the mud surface with heavy objects; at this point, the construction of one geotextile is completed.

[0010] S4. Repeat S2 and S3 to lay multiple geotextiles laterally along the slope. The geotextiles of adjacent pairs overlap each other, and the overlapping area is protected with heavy objects.

[0011] S5. Use pressure protection materials to protect the area from the slope toe to the slope shoulder on the geotextile.

[0012] 2. The method for laying and pressing geotextile on a slope according to claim 1, characterized in that: the geotextile in S1 is double-stitched, and the distance between the stitch line and the edge of the laying is greater than or equal to 50mm.

[0013] Optionally, the geotextile roll in S1 is a two-layer geotextile with a specification of 50m*6m and 400g / m2.

[0014] Optionally, the pipe in S1 is filled with counterweight filler.

[0015] Optionally, the counterweight filler can be sand or concrete.

[0016] Optionally, the pipe in S1 can be a steel pipe or a PVC pipe.

[0017] Optionally, the heavy objects in S2, S3, and S4 are all ton bags, and the material used for the ton bags is polypropylene or polyethylene. The pressure protection material in S5 is sandbags, sand, clay, or a mixture of the above.

[0018] Optionally, the geotextile reinforcement structure laid on the slope can be a structure consisting of multiple parallel rows of bags of heavy objects connected by a single rope, which are dropped from the top of the slope; a structure consisting of sand or cohesive soil; or a combination of the above two reinforcement structures.

[0019] Optionally, in S2, during the manual assisted laying of geotextile, it is necessary to temporarily press the geotextile on the mud surface with bagged gravel. After the laying is completed, the geotextile on the mud surface is pressed with ton bags, and marks are tied to the ton bags at the beginning and end positions in S3.

[0020] The advantages and positive effects of this invention are: the pressure protection method greatly improves the laying efficiency of geotextile, reduces equipment usage costs, enhances the pressure protection effect, reduces the possibility of subsequent sediment leakage, and can effectively avoid liability issues and additional costs caused by environmental pollution. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the state of the geotextile before laying in a specific embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A schematic diagram showing the state of the geotextile after its installation.

[0023] Figure 3 yes Figure 2 Schematic diagram of the ton bag protection status at the shoulder and toe of the slope;

[0024] Figure 4 yes Figure 3 Schematic diagram of the condition of medium-slope sandy soil, cohesive soil, and interlocking sandbags after embankment protection;

[0025] In the diagram: 1. Pipe; 2. Geotextile; 3. Ton bag; 4. Mixed inverted filter layer; 5. Two-piece stone layer; 6. Rock layer; 7. Mud surface; 8. Sand and clay soil; 9. Sandbag. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In the description of the present invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention through specific circumstances.

[0027] This invention provides a method for laying and tamping geotextiles on slopes. This method is applicable to projects including the formation of LNG terminals, workboat wharves, and LNG receiving terminals on land. The LNG terminal berths are 380m long and can accommodate a maximum of one 217,000m³ vessel. 3 LNG carrier; 48m long workboat berth; receiving terminal land area of ​​approximately 275,100 m². 2 The wharf is designed to handle 3 million tons per year, with a calculated maximum capacity of 6.1 million tons per year. Additionally, the wharf includes provisions for transshipment of loaded ships.

[0028] The construction of the inverted filter layer includes the construction of the inverted filter layer on the south revetment, the west revetment, and the north revetment, as well as the construction of the 206.5m inverted filter layer and the 184.5m inverted filter layer on the east breakwater renovation.

[0029] The specific steps are as follows:

[0030] Geotextile Laying Scheme: After the mixed filter layer 4 forms a working surface, the geotextile filter layer will be laid. The construction plan is to carry out the work during low tide. The geotextile 2 used is 400g / ㎡ double-layered, with a length of 50m and a width of 6m. At the selected stockpile site, the rolls of geotextile will be unrolled and cut according to the cross-sectional dimensions. When sewing each piece of geotextile together, a double-stitched seam machine will be used, and the seam distance from the edge of the laid block should not be less than 50mm. After pre-processing, the rolls will be transported to the construction site. The geotextile 2 will be wrapped around a steel pipe or PVC pipe (pipe 1) and tied. The steel pipe or PVC pipe will be filled with cement or concrete to increase its weight. Figure 1 , Figure 2 As shown, when laying geotextile 2, a predetermined length is left above, and ton bags 3 are used to press and protect the reserved geotextile on the top of the dike along the axial direction to prevent it from falling into the water. After the pressing and protection is completed, geotextile 2 is slowly lowered into the water along the slope. Divers cooperate to fully unfold the laid geotextile 2 and adjust it according to the position and the folds. Finally, it is ensured that the geotextile 2 is neat and wrinkle-free, completely covering the entire cross section, and leaving 2m of geotextile 2 on the mud surface 7.

[0031] Geotextile compression protection scheme:

[0032] like Figure 3 , 4 As shown, during the geotextile laying process, bagged gravel is used for temporary suturing. After the geotextile is laid neatly, ton bags 3 are immediately used to suturing the muddy part of the geotextile at the slope toe. The suturing method involves a truck crane lifting the ton bags to the slope toe, with divers assisting in suturing them to ensure that the ton bags 3 are arranged in rows along the axial direction at the slope toe. Finally, floats are tied to the beginning and end of the ton bags, thus completing the laying of one geotextile 2. The overlap width between each geotextile 2 is 1000mm. The overlap of geotextile 2 is suturing with ton bags, and sandbags 9, sand, cohesive soil, etc. are used to suturing from the slope toe to the slope shoulder.

[0033] The geotextile ballast method described above mainly utilizes ton bags 3 filled with sand and clay soil, and sand and clay soil 8. The ton bags 3 are generally made of polypropylene or polyethylene, which has high strength and long service life. In this case, the weight of a single ton bag 3 after filling is about 1.35 tons. The ton bags 3 are mainly used for ballast at the slope shoulder, slope toe, and overlap. They are placed with the help of lifting equipment, and the ballast effect is better than that of lighter sandbags 9 or bagged gravel. The slope ballast mainly uses sand and clay soil for covering and ballast. During the ballast process, the ton bags at the slope toe form a temporary underwater embankment. The sand and clay soil are piled up from the bottom to the top of the ton bags 3 on the mud surface 7, forming complete ballast from the slope to the slope toe, which greatly reduces the impact of tidal action on the geotextile. At the same time, multiple sandbags 9 are tied with nylon ropes to provide slope ballast for the geotextile 2 on the slope. The above-mentioned pressure protection method greatly improves the laying efficiency of geotextile, reduces equipment usage costs, enhances the pressure protection effect, reduces the possibility of subsequent sediment leakage, and can effectively avoid liability issues and additional costs caused by environmental pollution.

[0034] The above method combines surface laying of steel pipes or PVC pipes with underwater laying by divers. The steel or PVC pipes serve as a support to ensure the flatness and proper alignment of the geotextile on both sides of the slope. Underwater, divers assist in spreading and tidying the geotextile using the steel or PVC pipes. This approach ensures the quality of the slope laying and the proper alignment of the edges while reducing the difficulty of underwater laying, improving efficiency, and avoiding overlapping operations between personnel and vessels.

[0035] In the above method, the slope shoulder and slope toe are reinforced using ton bags 3. The high strength, high toughness and large capacity of ton bags 3 effectively avoid the problems of insufficient weight of sandbags 9 and bagged crushed stone used in conventional reinforcement and easy movement of geotextile. In addition, the underwater end of the geotextile is fixed by wrapping with steel pipe or PVC pipe, which effectively ensures the quality of the bottom reinforcement.

[0036] Slope protection consists of two parts. The bottom is protected using sand and clay (8). Under tidal forces, the sand and clay (8) flow down the slope to the bottom, ensuring the quality of the geotextile (2) bottom protection. On the slope, a rope is used to support numerous sandbags (9) or other heavy objects. This effectively solves the problem of high costs associated with overall soil and gravel laying, and addresses the issue of wind, waves, and tides causing heavy objects to fall and requiring repeated protection. This method ensures the weights maintain a continuous upward pull, providing effective slope protection unaffected by wind, waves, or tides. Furthermore, after the weights have been removed, they can be reused. This method offers excellent protection at a low cost.

[0037] The geotextile was laid and pressed using the above method. The geotextile was appropriately taut with few wrinkles, adhering tightly to the slope surface. The overlaps between adjacent geotextile sections showed good bonding. After adjustments by divers, the underwater portion met the relevant requirements of Section 4.8.3.8 of the Waterway Engineering Quality Inspection Standard (JTS257-2008). After pressing the slope shoulder, toe, and surface, the geotextile did not show any signs of insecure pressing or being pulled down. Under tidal action, the geotextile remained tightly adhered to the slope surface without bulging or being lifted, indicating a good pressing effect.

[0038] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A method for laying and pressing geotextiles on slopes, comprising the following steps: S1. Pre-processing geotextile: Unroll the geotextile in the work area and cut it to the required size according to the construction requirements. The cut geotextile is then double-stitched to form multiple geotextiles. The distance between the stitch line and the edge of the laying block is greater than or equal to 50mm. One edge of each geotextile is tied to a steel pipe or PVC pipe. The inside of the pipe is filled with sand or concrete as a counterweight filler. After tying, the geotextile is wrapped around the pipe. S2. Laying geotextile: Take a piece of geotextile and leave a geotextile of a predetermined width on the top of the embankment. The predetermined width is measured from the edge of the geotextile opposite to the edge of the tied pipe to the edge of the slope shoulder. Press polypropylene or polyethylene ton bags on the geotextile of the predetermined width. The ton bags are arranged in rows along the axial direction of the geotextile on the top of the embankment. The pipes are used to slowly roll the geotextile down the slope into the water. Divers work together to fully unfold the geotextile and lay it flat on the slope, ensuring that the surface is wrinkle-free. A 2m wide section of geotextile is left on the mud surface below the water for subsequent pressure protection. During the laying process, bagged gravel is used to temporarily press the geotextile on the mud surface. After the laying is completed, it is replaced with ton bags for pressing. S3. Pressing the geotextile: Press the geotextile onto the mud surface with ton bags, and mark the ton bags at the beginning and end positions; at this point, the construction of a single geotextile is completed. S4. Repeat S2 and S3 to lay multiple geotextiles laterally along the slope. The geotextiles of adjacent pairs overlap each other with an overlap width of 1000mm. The overlap area is protected by ton bags. S5. A composite pressure protection structure is used to provide overall pressure protection for the area from the slope to the slope shoulder on the geotextile: The composite pressure protection structure consists of multiple parallel structures with multiple bags of heavy objects connected by a single rope, which are dropped from the top of the slope. Sand and cohesive soil are piled up along the slope from bottom to top, and the bags at the slope toe form an underwater embankment.

2. The method for laying and pressing geotextile on a slope according to claim 1, characterized in that: S1 medium-roll geotextile is 50*6m in size and 400g / m². 2 Two layers of geotextile.

3. The method for laying and pressing geotextile on a slope according to claim 1, characterized in that: The bagged heavy objects in S5 are sandbags, which are removed and reused after the filling is completed.

4. The method for laying and pressing geotextile on a slope according to claim 1, characterized in that: The S3 medium-ton bag weighs approximately 1.35 tons when filled.

5. The method for laying and pressing geotextile on a slope according to claim 4, characterized in that: S5 medium sand and clay soil are piled up from bottom to top, starting from the mud surface ton bags, completely covering the slope to the toe.

6. The method for laying and pressing geotextile on a slope according to claim 1, characterized in that: The geotextile laying operation in S2 is carried out during low tide.

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