Geomembrane lowering device, underground flexible diaphragm wall and construction method

Abstract

The invention discloses a geomembrane lowering device, an underground flexible diaphragm wall and a construction method.The geomembrane lowering device comprises a connector and a membrane clamping device; the two connectors are arranged side by side, and vertical guide through grooves are formed in the opposite side faces of the two connectors. The diaphragm clamping device comprises two clamping bodies and a clamping plate assembly. The two clamping bodies are arranged at the two ends of the clamping plate assembly correspondingly. The two clamping bodies can be arranged in the guide through grooves in a one-to-one corresponding and matched mode and can vertically slide along the guide through grooves. The clamping plate assembly is used for clamping the geomembrane; when the geomembrane is put down, the multiple membrane clamping devices are arranged at intervals and put down in sequence. The geomembrane laying device can ensure that the geomembrane is flatly laid, the laying precision is high, the efficiency is high, the anti-seepage effect of the anti-seepage wall is good, and the laying success rate of the geomembrane is increased.

Description

Technical Field

[0001] This invention belongs to the field of underground continuous wall technology, specifically relating to a geomembrane lowering device, an underground flexible seepage barrier wall, and a construction method. Background Technology

[0002] In engineering projects involving underground structures such as landfills, tailings ponds, and industrial solid waste disposal sites, vertical cutoff walls are required to isolate contaminated areas from the surrounding environment and prevent pollution from spreading. Currently, geomembranes are often used to construct flexible vertical cutoff walls, combined with mineral-based backfill materials with good adsorption and self-healing properties (such as bentonite and clay) to construct composite vertical cutoff walls. These composite vertical cutoff walls have advantages such as good impermeability, chemical corrosion resistance, durability, and strong deformation resistance.

[0003] The geomembrane is 3mm thick, with a typical width of 4-6m, and a vertical laying depth currently mostly within 30m. Therefore, construction is mostly done in sections, with the sections then connected by welding or interlocking to form a whole. Finally, clay and bentonite filler are backfilled into the trench. Patent CN112095599A discloses a combined underground continuous wall support device and its usage method, which uses a supporting steel frame and counterweights to lay the geomembrane; Patent CN112145207A discloses a sheet coupling interlocking connection device and its usage method, which uses locking hooks to connect the geomembranes and installs slow-setting expansion waterstop strips to block seepage paths and strengthen water sealing.

[0004] However, the above-mentioned laying device and method, as well as the connection between membranes, have the following problems:

[0005] (1) Temporary anchoring of geomembrane to steel frame: Since the geomembrane is anchored at the perimeter rather than at both ends or all four sides, the geomembrane cannot be laid out completely flat and often has bends and wrinkles. At the same time, for trenches with a large depth, such as more than 30m, the erection and assembly of the steel frame is more difficult.

[0006] (2) A counterweight needs to be added to the bottom of the geomembrane to overcome buoyancy and allow it to be lowered smoothly. This method of lowering requires high precision in counterweight calculation, selection of hoisting point location, and overall support frame. Even slight swaying will cause the geomembrane to deviate from the designated lowering position, and the accuracy of the lowering position cannot be controlled. For projects with a large trench depth, the swaying during the lowering process will be greater, and the accuracy of the lowering position will be even lower.

[0007] (3) When interlocking adjacent sections, a waterstop strip needs to be inserted into the mouth of the interlocking strip to expand and lock it. During construction, it is often inserted into the groove parallel and perpendicularly. Since adjacent sections need to be hoisted and interlocked with the previous section, it cannot be completely guaranteed that the waterstop strip will not be squeezed, bent and broken during the interlocking process. If the waterstop strip is found to be damaged, the entire membrane material and support frame need to be pulled out in time, replaced and then the membrane is lowered and interlocked. The interlocking control accuracy of the interlocking is high.

[0008] (4) After the geomembrane and the supporting steel frame are lowered to the bottom of the trench and locked with the adjacent sections, the temporary anchoring of the geomembrane and the supporting steel frame needs to be released, and then the supporting steel frame is lifted out. During the lifting process, the geomembrane may be rubbed and touched, causing local damage to the geomembrane, which will affect the seepage prevention effect. Summary of the Invention

[0009] In view of this, the present invention provides a geomembrane lowering device, an underground flexible anti-seepage wall, and a construction method. The lowering device can ensure that the geomembrane is laid out straight, with high lowering accuracy and efficiency, and the anti-seepage effect of the anti-seepage wall is good, thereby improving the success rate of geomembrane lowering.

[0010] This invention is achieved through the following technical solution:

[0011] A geomembrane lowering device includes a joint and a membrane clamping device;

[0012] The two connectors are arranged side by side, and vertical guide grooves are provided on the opposite sides of the two connectors;

[0013] The diaphragm clamping device includes two clamping bodies and a clamping plate assembly; the two clamping bodies are respectively disposed at both ends of the clamping plate assembly; the two clamping bodies can be respectively matched and disposed in the guide groove, and can slide vertically along the guide groove;

[0014] The geomembrane is held in place by a clamping plate assembly; when the geomembrane is lowered, several membrane clamping devices are arranged at intervals and lowered in sequence.

[0015] Furthermore, each connector includes several connector modules that are mated together vertically; the connector module is a shell structure with openings at the top and bottom.

[0016] Each connector module has through slots on two opposite sides, and several through slots are joined together to form a guide slot.

[0017] Furthermore, each connector module has connection holes at the top and bottom ends of the other two opposite sides.

[0018] Let the two adjacent connector modules be connector module I and connector module II, respectively;

[0019] Several connecting components are provided between connector module I and connector module II. Each connecting component includes two connecting plates and two sets of bolts.

[0020] Two connecting plates are respectively set inside and outside the connection point; one set of bolts passes through the outer connecting plate, the connecting hole of connector module I, and the inner connecting plate in sequence and is tightened, and another set of bolts passes through the outer connecting plate, the connecting hole of connector module II, and the inner connecting plate in sequence and is tightened.

[0021] Furthermore, the end faces of connector module I and connector module II are bonded together with an impermeable adhesive;

[0022] The joint is filled with impermeable concrete I.

[0023] Furthermore, the sidewalls of the guide channel bend inward at the opening, making the horizontal cross-section of the guide channel "C" shaped.

[0024] Furthermore, each clamping body includes a U-shaped steel and two sets of limiting screws; the clamping plate assembly includes two clamping plates;

[0025] Two clamping plates are respectively set on both sides of the geomembrane and are positioned opposite each other; the two ends of the clamping plate assembly extend into the corresponding side U-shaped steel; each U-shaped steel has through holes on its two opposite side plates, and nuts are coaxially fixedly connected to the through holes; a set of limiting bolts passes through the nuts on one side plate and abuts against one clamping plate; another set of limiting bolts passes through the nuts on the other side plate and abuts against the other clamping plate.

[0026] The clamping plate can be made to fit the geomembrane by tightening the limiting bolts.

[0027] Furthermore, a circular pressure plate is provided between the limiting bolt and the clamping plate.

[0028] A method for lowering a geomembrane, based on a geomembrane lowering device, the method being as follows:

[0029] Step 1: Lift one connector module into the trench and lower it. When the upper end of the lower connector module is aligned with the trench opening, lift another connector module so that its lower end is aligned with the upper end of the lower connector module. Connect the two connector modules to form a connector assembly.

[0030] Step 2: Continue to lower the connector assembly until the upper end of the connector assembly is flush with the groove opening. Then, lift a connector module and align its lower end with the upper end of the lower connector assembly. Connect the connector assembly and the connector module to form a new connector assembly.

[0031] Step 3: Repeat Step 2 until the joint assembly forms a joint of the set height, with the bottom of the joint located at the bottom of the trench;

[0032] Step 4: Inject impermeable concrete I into the joint;

[0033] Step 5: Repeat steps 1 to 4 to arrange another joint according to the set spacing;

[0034] Step 6: Use a winch to lower the geomembrane. When the end of the geomembrane is near the edge of the trench, install the membrane clamping device on the geomembrane.

[0035] Step 7: Continue to lower the geomembrane, so that the clamping bodies of the membrane clamping device enter the guide barrel groove of the joint one by one, and lower the geomembrane along the guide barrel groove.

[0036] Step 8: After lowering the geomembrane to the set distance, clamp and install a membrane clamping device on the geomembrane near the edge of the trench.

[0037] Step 9: Repeat steps 7 and 8 until the geomembrane is lowered to the bottom of the trench along the guide groove of the joint, thus completing the lowering of the geomembrane.

[0038] An underground flexible seepage barrier wall, based on a geomembrane lowering device, is characterized by comprising a geomembrane lowering device and a geomembrane;

[0039] Two or more joints are vertically installed in the trench used for laying the geomembrane, with the sides of two adjacent joints having guide grooves facing each other; the two clamping bodies of each membrane clamping device are respectively and correspondingly installed in the opposite guide grooves, and the two clamping bodies are horizontally opposite each other.

[0040] The clamping plate assembly is set to hold the geomembrane, and several membrane clamping devices are arranged at intervals along the vertical direction;

[0041] The geomembrane extends into the guide groove on both sides, and the guide groove and the clamping body are filled with impermeable concrete II;

[0042] The gap between the geomembrane and the trench was filled with impermeable concrete I;

[0043] The guide channel and membrane clamping device are filled with impermeable concrete II, and the impermeability coefficient of impermeable concrete II is on the order of magnitude greater than or equal to the impermeability coefficient of the geomembrane.

[0044] Furthermore, a grouting pipe is installed in the guide channel from top to bottom for grouting the impermeable concrete II;

[0045] The grouting pipe includes several grouting pipe sections, and each grouting pipe section can be connected to a diaphragm clamping device.

[0046] Beneficial effects:

[0047] (1) The geomembrane lowering device provided by the present invention guides the lowering of the geomembrane through the joint and restricts the membrane clamping device, resulting in high lowering accuracy; and several membrane clamping devices are arranged at intervals, which can support the geomembrane at intervals to form a semi-flexible and semi-rigid structure for lowering; under the gravity of the membrane clamping device, the geomembrane can be lowered quickly and can be laid flat during the lowering process.

[0048] (2) The connector module of the present invention is a shell structure, which can be prefabricated in the factory. The use of a shell structure connector module can reduce weight and reduce hoisting difficulty. Moreover, since the depth of the trench is relatively deep, some even greater than 30m, it is not easy to process or hoist and install a 30m connector directly. In this embodiment, the connector module is connected to form a connector. In engineering practice, the connector module can be hoisted into the trench with hoisting equipment, and then connected section by section and lowered down gradually until the connector reaches the trench depth and is stably lowered to the bottom of the trench. This not only facilitates construction, but is also applicable to different trench depths.

[0049] (3) A connecting component is provided between adjacent connector modules of the present invention to ensure that the two connector modules do not separate during the hoisting process.

[0050] (4) The end faces of joint module I and joint module II of the present invention are bonded with impermeable adhesive, and impermeable concrete I is filled inside the joint to ensure the sealing of the joint and achieve the seepage prevention effect at the joint. In addition, filling the joint module with impermeable concrete I can also increase the stability of the joint.

[0051] (5) The horizontal cross section of the guide channel of the present invention is "C" shaped, which can further limit the horizontal position of the corresponding clamping body on the film clamping device, prevent the HDPE film from moving left and right, and further improve the lowering accuracy.

[0052] (6) The specific structure of the clamping body and clamping plate assembly of the membrane clamping device of the present invention can stably clamp the geomembrane, so that the geomembrane and the membrane clamping device are relatively fixed to form a whole. Moreover, the clamping body is located in the guide groove, so that the geomembrane can be well in a vertically flat state during the lowering process and after the lowering is completed. After the lowering, there is no need to remove the membrane clamping device, which can ensure the integrity of the geomembrane.

[0053] (7) The present invention provides a circular pressure plate between the limiting bolt and the clamping plate, which can expand the force-bearing area and avoid the bolt directly contacting the clamping plate, thereby enabling the clamping plate to smoothly adhere to the geomembrane.

[0054] (8) The geomembrane lowering method provided by the present invention is simple to operate, can ensure that the geomembrane is laid out straight, has high lowering accuracy, high lowering efficiency, and good seepage prevention effect, and can greatly improve the success rate of membrane lowering; in addition, the materials used are all readily available and inexpensive shelf products, which have universality and economy, and can be widely used in engineering fields such as seepage prevention or isolation barriers of underground structures such as landfills, tailings slag ponds and industrial solid waste slag yards, with a wide range of application scenarios.

[0055] (9) The present invention provides an underground flexible seepage barrier wall. After the geomembrane is lowered using a geomembrane lowering device, there is no need to remove the geomembrane lowering device. The joint is part of the seepage barrier wall, and the two sides of the geomembrane are respectively inserted into the guide channel. The guide channel is filled with impermeable concrete II for seepage prevention. The impermeability coefficient of the impermeable concrete II is greater than or equal to the impermeability coefficient of the geomembrane, which can achieve seepage prevention between the geomembrane and the joint. The seepage prevention effect is good, the reliability is high, and repeated construction is avoided. Moreover, several membrane clamping devices are arranged at intervals in the vertical direction, which can support the geomembrane at intervals to ensure that the geomembrane is in a straight state.

[0056] (10) The underground flexible seepage barrier provided by the present invention also includes a grouting pipe. The grouting pipe is modularly spliced ​​from several grouting pipe sections and can be installed together with the membrane clamping device, which facilitates the installation of the grouting pipe. Attached Figure Description

[0057] Figure 1 This is a plan view showing the positional relationship between the geomembrane and the joint;

[0058] Figure 2 This is an elevation view showing the positional relationship between the geomembrane and the joint.

[0059] Figure 3 This is a schematic diagram of the diaphragm clamping device and the connector.

[0060] Figure 4 This is a top view of the connector;

[0061] Figure 5 This is a connection diagram of the upper and lower connector modules;

[0062] Figure 6 This is a structural diagram of the diaphragm clamping device;

[0063] Among them, 1-joint, 2-guide channel, 3-impermeable concrete I, 4-joint module I, 5-joint module II, 6-connecting plate, 7-bolt, 8-impermeable adhesive, 9-U-shaped steel, 10-grouting pipe, 11-geomembrane, 12-clamp assembly, 13-channel wall, 15-limiting bolt. Detailed Implementation

[0064] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0065] Example 1:

[0066] This embodiment provides a geomembrane lowering device; see attached document. Figure 1-3 It includes connector 1 and diaphragm clamping device;

[0067] Two connectors 1 are arranged side by side, and vertical guide grooves 2 are provided on the opposite sides of the two connectors 1;

[0068] The diaphragm clamping device includes two clamping bodies and a clamping plate assembly 12; the two clamping bodies are respectively disposed at both ends of the clamping plate assembly 12; the two clamping bodies can be respectively matched and disposed in the guide groove 2, and can slide vertically along the guide groove 2;

[0069] The clamping plate assembly 12 is configured to clamp the geomembrane 11; when the geomembrane is lowered, several membrane clamping devices are arranged at intervals and lowered in sequence.

[0070] This embodiment provides a geomembrane lowering device, which includes a joint 1 to guide the lowering of the geomembrane 11 and restricts the membrane clamping device, resulting in high lowering accuracy. Furthermore, several membrane clamping devices are arranged at intervals to support the geomembrane 11 at intervals, forming a semi-flexible and semi-rigid structure for lowering. Under the gravity of the membrane clamping device, the geomembrane 11 can be lowered quickly and can be laid flat during the lowering process.

[0071] Furthermore, the sidewall of the guide channel 2 bends inward at the opening, making the horizontal cross-section of the guide channel 2 "C" shaped; this can further limit the horizontal movement of the corresponding clamping body; prevent the HDPE film from moving left and right, and further improve the lowering accuracy.

[0072] Each joint 1 includes several joint modules that are joined vertically. The joint module is a shell structure with openings at the top and bottom. Each shell structure has through slots on two opposite sides and connection holes at the top and bottom of the other two opposite sides. Using a shell structure for the joint module reduces weight and eases hoisting difficulty. The corresponding through slots are joined to form guide slots 2. Since the trench depth is relatively deep, some even greater than 30m, directly using 30m joints is not easy to process or hoist and install. In this embodiment, joint modules are connected to form joint 1. In engineering practice, the joint modules can be hoisted into the trench using hoisting equipment, and then connected section by section and lowered gradually until joint 1 reaches the trench depth and is stably lowered to the bottom of the trench. This not only facilitates construction but is also applicable to different trench depths.

[0073] Let the two adjacent connector modules be connector module I4 and connector module II5, respectively; see appendix. Figure 4 and 5Several connecting components are provided between connector module I4 and connector module II5. Each connecting component includes two connecting plates 6 and two sets of bolts 7.

[0074] Two connecting plates 6 are respectively set inside and outside the connection point; a set of bolts 7 passes through the outer connecting plate 6, the connecting hole of the connector module I 4, and the inner connecting plate 6 in sequence and is tightened, and another set of bolts 7 passes through the outer connecting plate 6, the connecting hole of the connector module II 5, and the inner connecting plate 6 in sequence and is tightened, so as to ensure that the two connector modules do not separate during the hoisting process.

[0075] Furthermore, the end faces of joint module I4 and joint module II5 are bonded with anti-seepage adhesive 8, and the outer edges of the connection are welded to ensure the sealing of the connection and guarantee the seepage prevention of joint 1. Anti-seepage concrete I3 is filled inside joint 1. Filling joint 1 with anti-seepage concrete I3 increases the stability of joint 1 and improves its seepage prevention capability.

[0076] See appendix Figure 6 Each clamping body includes a U-shaped steel 9 and two sets of limiting bolts 15; the clamping plate assembly 12 includes two clamping plates;

[0077] Two clamping plates are respectively set on both sides of the geomembrane 11 and are positioned opposite each other; the two ends of the clamping plate assembly 12 extend into the corresponding side U-shaped steel 9; each U-shaped steel 9 has through holes on its two opposite side plates, and nuts are coaxially fixedly connected to the through holes; a set of limiting bolts 15 passes through the nuts on one side plate and abuts against one clamping plate; another set of limiting bolts 15 passes through the nuts on the other side plate and abuts against the other clamping plate; by tightening the limiting bolts 15, the clamping plates can be made to fit the geomembrane 11 and clamp the geomembrane 11.

[0078] Furthermore, a circular pressure plate is provided between the limiting bolt 15 and the clamping plate. The circular pressure plate can contact the surface of the clamping plate, increasing the force-bearing area and avoiding direct point contact between the bolt and the clamping plate, so that the clamping plate can smoothly adhere to the geomembrane 11.

[0079] In this embodiment, the membrane clamping device places the geomembrane 11 on the inner side and sets clamping plates on both sides of the geomembrane 11. Then, the limiting bolts 15 are tightened to press the clamping plates on both sides, firmly clamping the geomembrane 11. Since the geomembrane 11 and the membrane clamping device are fixed into a whole, and the clamping body is located in the guide groove 2, the geomembrane 11 can be well kept in a vertical and flat state during and after the lowering process. Moreover, after lowering, there is no need to remove the membrane clamping device, which can ensure the integrity of the geomembrane 11.

[0080] In one embodiment, a plurality of diaphragm clamping devices are arranged at equal intervals along the vertical direction.

[0081] Example 2:

[0082] Based on Example 1, this embodiment provides a method for laying geomembrane, as follows:

[0083] Step 1: Use lifting equipment to lift one joint module into the trench and lower it. When the upper end of the lower joint module is aligned with the trench opening, lift another joint module so that its lower end is aligned with the upper end of the lower joint module. Use anti-permeability adhesive 8 to bond the contact end faces of the two joint modules and weld the outer edge of the connection between the two. Then use the connecting assembly to connect the two joint modules to form a joint assembly.

[0084] Step 2: Continue lowering the joint assembly until the upper end of the joint assembly is flush with the groove opening. Then, lift a joint module and align its lower end with the upper end of the lower joint assembly. Use anti-permeability adhesive 8 to bond the contacting end faces of the joint assembly and the joint module, and perform full-section welding on the outer edge of the connection between the two. Then, use the connecting assembly to connect the joint assembly and the joint module to form a new joint assembly.

[0085] Step 3: Repeat step 2 until the joint assembly forms joint 1 at the set height, with the bottom of joint 1 located at the bottom of the groove;

[0086] Step 4: Inject impermeable concrete I3 into joint 1;

[0087] Step 5: Repeat steps 1 to 4 to arrange another connector 1 according to the set spacing;

[0088] Step 6: Use a winch to lower the geomembrane 11. When the end of the geomembrane 11 is near the edge of the trench, install the membrane clamping device on the geomembrane 11.

[0089] Furthermore, the specific method for installing the membrane clamping device on the geomembrane 11 is as follows: two clamping plates are placed on the two surfaces of the geomembrane 11, clamping bodies are symmetrically installed on both sides of the geomembrane 11, and the two ends of each clamping plate are placed in the corresponding clamping body. The clamping plates on the two surfaces of the geomembrane 11 are pressed by tightening the limiting bolts 15, so that the clamping plates are attached to the geomembrane 11, thereby clamping the geomembrane 11.

[0090] Step 7: Continue to lower the geomembrane 11 so that the clamping bodies of the membrane clamping device enter the guide barrel groove 2 of the joint 1 one by one, and lower the geomembrane 11 along the guide barrel groove 2.

[0091] Step 8: After lowering the geomembrane 11 to the set distance, clamp and install a membrane clamping device on the geomembrane 11 near the edge of the trench.

[0092] Step 9: Repeat steps 7 and 8 until the geomembrane 11 is lowered to the bottom of the trench along the guide groove 2 of the joint 1, thus completing the lowering of the geomembrane.

[0093] Example 3:

[0094] Based on embodiment 1 or 2, this embodiment provides an underground flexible seepage barrier wall, including a geomembrane lowering device and a geomembrane;

[0095] Two or more joints 1 are vertically arranged in the trench for laying geomembrane 11, and the sides of two adjacent joints 1 with guide grooves 2 face each other; the two clamping bodies of each membrane clamping device are respectively matched and arranged in the opposite guide grooves 2, and the two clamping bodies are horizontally opposite each other.

[0096] The clamping plate assembly 12 is configured to clamp the geomembrane 11, and several membrane clamping devices are arranged at intervals along the vertical direction.

[0097] Both sides of the geomembrane 11 extend into the guide groove 2, and the guide groove 2 and the clamping body are filled with impermeable concrete II.

[0098] The gap between the geomembrane and the trench was filled with impermeable concrete I3;

[0099] The impermeability coefficient of impermeable concrete II is greater than that of impermeable concrete I3, and the order of magnitude of the impermeability coefficient of impermeable concrete II is greater than or equal to that of the geomembrane impermeability coefficient.

[0100] This embodiment provides an underground flexible seepage barrier wall with a geomembrane. After the geomembrane is lowered using a geomembrane lowering device, the device does not need to be removed. The joint 1 is part of the seepage barrier wall. Both sides of the geomembrane 11 extend into the guide groove 2, which is filled with impermeable concrete II for seepage prevention. This achieves seepage prevention between the geomembrane 11 and the joint 1. Furthermore, the impermeability coefficient of the impermeable concrete II is on the order of magnitude greater than or equal to the impermeability coefficient of the geomembrane, resulting in good seepage prevention, high reliability, and avoiding repeated construction. In addition, several membrane clamping devices are arranged at intervals along the vertical direction, providing intermittent support to the geomembrane 11 and ensuring it remains straight.

[0101] See appendix Figure 6 The guide channel 2 is equipped with a grouting pipe 10 running from top to bottom. The grouting pipe 10 passes through the guide channel 2 and is clamped in the main body. The aforementioned anti-seepage concrete II can be injected through the grouting pipe 10, either from bottom to top or chemically, to ensure the sealing and seepage prevention effect between the joints and form a sealed anti-seepage curtain.

[0102] Furthermore, the grouting pipe 10 includes several grouting pipe segments, each of which passes through the inner cavity of the U-shaped steel 9 and is connected to the U-shaped steel 9; when lowering the geomembrane 11, the grouting pipe segments can be connected while lowering to form the grouting pipe 10, which facilitates the lowering of the grouting pipe 10.

[0103] Example 4:

[0104] This embodiment, based on embodiment 3, provides a construction method for an underground flexible seepage barrier wall;

[0105] Step 1: Arrange multiple joints 1, and fill the joints 1 with impermeable concrete I3. Specifically:

[0106] Step 11: For a joint 1, use a lifting and hoisting equipment to lift a joint module into the trench and lower it. When the upper end of the lower joint module is aligned with the trench opening, lift another joint module so that its lower end is aligned with the upper end of the lower joint module. Use anti-permeability adhesive 8 to bond the contact end faces of the two joint modules and perform full-section welding on the outer edge of the connection between the two. Then use a connecting assembly to connect the two joint modules to form a joint assembly.

[0107] Step 12: Continue to lower the joint assembly until the upper end of the joint assembly is flush with the groove opening. Then, lift a joint module and align its lower end with the upper end of the lower joint assembly. Use anti-permeability adhesive 8 to bond the contact end faces of the joint assembly and the joint module, and perform full-section welding on the outer edge of the connection between the two. Then, use the connecting assembly to connect the joint assembly and the joint module to form a new joint assembly.

[0108] Step 13: Repeat step 12 until the joint assembly forms joint 1 at the set height, with the bottom of joint 1 located at the bottom of the groove;

[0109] Step 14; Inject impermeable concrete I3 into joint 1;

[0110] Step 15: Repeat steps 11 to 14 to arrange a set number of connectors 1 according to the set spacing;

[0111] Step 2: Lowering the geomembrane. Specifically:

[0112] Step 21: Use a winch to lower the geomembrane 11. When the end of the geomembrane 11 is near the edge of the trench, install a membrane clamping device on the geomembrane 11 and connect and install a grouting pipe inside the membrane clamping device.

[0113] Step 22: Continue to lower the geomembrane 11 so that the clamping bodies of the membrane clamping device enter the guide groove 2 of the joint 1 one by one, and lower the geomembrane 11 along the guide groove 2.

[0114] Step 23: After lowering the geomembrane 11 to the set distance, near the edge of the trench, clamp and install a membrane clamping device on the geomembrane 11, and install a grouting pipe section inside the membrane clamping device, and connect the upper and lower adjacent grouting pipe sections.

[0115] Step 24: Repeat steps 22 and 23 until the geomembrane 11 is lowered to the bottom of the trench along the guide groove 2 of the joint 1, and the grouting pipe section is connected to form the grouting pipe 10.

[0116] Step 3: Backfill the gap between joint 1, membrane clamping device, geomembrane 11 and trench with impermeable concrete I3;

[0117] Step 4: Grout or chemically grout into the grouting pipe 10 from bottom to top;

[0118] Step 5: Repeat steps 2 through 4 to form a continuous, strong, corrosion-resistant, and highly impermeable flexible anti-seepage wall.

[0119] Example 5:

[0120] This embodiment provides a specific embodiment based on embodiments 1-5; the connector module 4 is made of galvanized steel plate, and the height of each connector module 4 is 5m to 9m; the spacing between adjacent connectors 1 is basically the same as the width of HDPE film 11, which is 4m to 6m;

[0121] Connecting plate 6 is made of galvanized steel sheet;

[0122] The thickness of the U-shaped steel 9 is 2cm to 3cm, the height of the U-shaped steel 9 is 10cm to 15cm, and each side plate of the U-shaped steel 9 is provided with four threaded holes, which are distributed in a rectangular shape.

[0123] The plywood is made of long, thin steel plates;

[0124] The center distance between two adjacent diaphragm clamping devices is 1.5m to 3.0m.

[0125] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. 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 geomembrane lowering device, characterized in that, Includes connectors and diaphragm clamping devices; The two connectors are arranged side by side, and vertical guide grooves are provided on the opposite sides of the two connectors. The diaphragm clamping device includes two clamping bodies and a clamping plate assembly; the two clamping bodies are respectively disposed at both ends of the clamping plate assembly; the two clamping bodies can be respectively matched and disposed in the guide groove, and can slide vertically along the guide groove; The geomembrane is held in place by a clamping plate assembly; when the geomembrane is lowered, several membrane clamping devices are arranged at intervals and lowered in sequence.

2. The geomembrane lowering device as described in claim 1, characterized in that, Each connector includes several connector modules that are joined together vertically; the connector module is a shell structure with openings at the top and bottom. Each connector module has through slots on two opposite sides, and several through slots are joined together to form a guide slot.

3. The geomembrane lowering device as described in claim 2, characterized in that, Each connector module has connection holes at the top and bottom ends of the other two opposite sides. Let the two adjacent connector modules be connector module I and connector module II, respectively; Several connecting components are provided between connector module I and connector module II. Each connecting component includes two connecting plates and two sets of bolts. Two connecting plates are respectively set inside and outside the connection point; one set of bolts passes through the outer connecting plate, the connecting hole of connector module I, and the inner connecting plate in sequence and is tightened, and another set of bolts passes through the outer connecting plate, the connecting hole of connector module II, and the inner connecting plate in sequence and is tightened.

4. The geomembrane lowering device as described in claim 3, characterized in that, The end faces of connector module I and connector module II are bonded together with impermeable adhesive; The joint is filled with impermeable concrete I.

5. A geomembrane lowering device as described in any one of claims 1-4, characterized in that, The sidewalls of the guide channel bend inward at the opening, making the horizontal cross-section of the guide channel "C" shaped.

6. A geomembrane lowering device as described in any one of claims 1-4, characterized in that, Each clamping body includes a U-shaped steel and two sets of limit screws; the clamping plate assembly includes two clamping plates; Two clamping plates are respectively set on both sides of the geomembrane and are positioned opposite each other; the two ends of the clamping plate assembly extend into the corresponding side U-shaped steel; each U-shaped steel has through holes on its two opposite side plates, and nuts are coaxially fixedly connected to the through holes; a set of limiting bolts passes through the nuts on one side plate and abuts against one clamping plate; another set of limiting bolts passes through the nuts on the other side plate and abuts against the other clamping plate. The clamping plate can be made to fit the geomembrane by tightening the limiting bolts.

7. The geomembrane lowering device as described in claim 6, characterized in that, A circular pressure plate is provided between the limit bolt and the clamping plate.

8. A method for lowering a geomembrane, based on the geomembrane lowering device described in claim 5, characterized in that, The method is as follows: Step 1: Lift one connector module into the trench and lower it. When the upper end of the lower connector module is aligned with the trench opening, lift another connector module so that its lower end is aligned with the upper end of the lower connector module. Connect the two connector modules to form a connector assembly. Step 2: Continue to lower the connector assembly until the upper end of the connector assembly is flush with the groove opening. Then, lift a connector module and align its lower end with the upper end of the lower connector assembly. Connect the connector assembly and the connector module to form a new connector assembly. Step 3: Repeat Step 2 until the joint assembly forms a joint of the set height, with the bottom of the joint located at the bottom of the trench; Step 4: Inject impermeable concrete I into the joint; Step 5: Repeat steps 1 to 4 to arrange another joint according to the set spacing; Step 6: Use a winch to lower the geomembrane. When the end of the geomembrane is near the edge of the trench, install the membrane clamping device on the geomembrane. Step 7: Continue to lower the geomembrane, so that the clamping bodies of the membrane clamping device enter the guide barrel groove of the joint one by one, and lower the geomembrane along the guide barrel groove. Step 8: After lowering the geomembrane to the set distance, clamp and install a membrane clamping device on the geomembrane near the edge of the trench. Step 9: Repeat steps 7 and 8 until the geomembrane is lowered to the bottom of the trench along the guide groove of the joint, thus completing the lowering of the geomembrane.

9. An underground flexible seepage barrier wall, based on a geomembrane lowering device according to any one of claims 1-8, characterized in that, Includes geomembrane lowering device and geomembrane; Two or more joints are vertically installed in the trench used for laying the geomembrane, with the sides of two adjacent joints having guide grooves facing each other; the two clamping bodies of each membrane clamping device are respectively and correspondingly installed in the opposite guide grooves, and the two clamping bodies are horizontally opposite each other. The clamping plate assembly is set to hold the geomembrane, and several membrane clamping devices are arranged at intervals along the vertical direction; The geomembrane extends into the guide groove on both sides, and the guide groove and the clamping body are filled with impermeable concrete II; The gap between the geomembrane and the trench was filled with impermeable concrete I; The guide channel and membrane clamping device are filled with impermeable concrete II, and the impermeability coefficient of impermeable concrete II is on the order of magnitude greater than or equal to the impermeability coefficient of the geomembrane.

10. The underground flexible seepage barrier wall as described in claim 9, characterized in that, The guide channel is equipped with grouting pipes running from top to bottom for grouting the impermeable concrete II; The grouting pipe includes several grouting pipe sections, and each grouting pipe section can be connected to a diaphragm clamping device.

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