Construction method of HDPE film composite flexible underground impervious wall

Abstract

The present application provides a construction method for a HDPE membrane composite flexible underground anti-seepage wall, comprising: step S1, excavating a construction trench, and determining a first preset position and a second preset position in the construction trench; step S2, lowering a HDPE membrane sheet with a locking joint welded at the end to the first preset position; step S3, lowering a junction box device to the second preset position, and plugging the junction box device and the locking joint; step S4, pouring filling material into the construction trench; step S5, before the filling material solidifies and the subsequent membrane sheet is lowered, removing the junction box device from the second preset position, separating the locking joint from the junction box device and keeping them intact. The present application can achieve the protection of the HDPE membrane locking joints during technical segmentation, sequential construction, or construction interruption during the construction process of the HDPE membrane composite flexible underground anti-seepage wall, avoid difficulties in locking the HDPE membrane sheets during subsequent construction, and ensure construction efficiency and quality.

Description

Technical Field

[0001] The present application relates to the fields of civil engineering, mining, water conservancy and environment, and in particular to a construction method of a HDPE film composite flexible underground anti-seepage wall. Background Art

[0002] HDPE membranes are now widely used in civil engineering, mining, water conservancy, and environmental engineering fields in China. They provide excellent corrosion resistance and ductility for waterproofing or isolation purposes. HDPE membranes with thicknesses up to 3mm and widths exceeding 6 meters are now maturely produced in China. They are joined together into any width using sophisticated hot-melt welding techniques, and with mature testing technology, they are widely used in projects such as waterproofing or isolation barriers in open-air landfills, tunnels, and underground structures. Flexible underground anti-seepage walls, primarily clay slurry walls, bentonite clay slurry walls, and self-setting mortar walls, also have some application in China due to their excellent settlement adaptability and anti-seepage performance. To further improve the anti-seepage, durability, and reliability of these flexible underground anti-seepage walls, HDPE membrane composite flexible underground anti-seepage walls are also gradually being adopted in China.

[0003] The construction of HDPE membrane composite flexible underground anti-seepage wall begins with the underground anti-seepage wall grooving operation. After completing a certain length of underground anti-seepage wall grooving, the HDPE membrane is installed below, and sealing filling or pouring is performed on both sides (or one side) of the membrane. The membranes are interlocked and connected by HDPE lock joints welded at both ends of the membrane.

[0004] During the construction process, it is often necessary to construct the HDPE membrane composite flexible underground anti-seepage wall in sections or sequences, or to interrupt the construction for technical reasons. Since the wall needs to be filled with sealing material, the filling sealing material will wrap around the HDPE locking joint and solidify, often resulting in the subsequent HDPE membrane sheet not being able to properly lock with the HDPE locking joint of the previous membrane sheet, causing potential quality problems at the joint, seriously affecting the construction quality and efficiency of the HDPE membrane composite flexible underground anti-seepage wall. To this end, the present application proposes a construction method for the HDPE membrane composite flexible underground anti-seepage wall. Summary of the Invention

[0005] The purpose of this application is to address the above problems and provide a construction method for a HDPE membrane composite flexible underground anti-seepage wall.

[0006] The present application provides a construction method of a HDPE film composite flexible underground anti-seepage wall, the method comprising the following steps:

[0007] Step S1: excavating a construction trench and determining a first preset position and a second preset position in the construction trench;

[0008] Step S2: lowering the HDPE diaphragm with a locking joint welded to the end to the first preset position;

[0009] Step S3, lowering the junction box device to the second preset position, and plugging the junction box device into the locking connector;

[0010] Step S4, pouring filling material into the construction groove;

[0011] Step S5: After the filling material solidifies and before the subsequent membrane is set, the joint box device is removed from the second preset position, and the locking joint is separated from the joint box device and kept intact.

[0012] According to the technical solution provided in certain embodiments of the present application, in step S3, before the junction box device is lowered to the second preset position, a suitable number of junction box sections are selected according to the depth of the construction trench, and the junction box sections are spliced and installed in sequence to obtain the junction box device.

[0013] According to the technical solution provided in certain embodiments of the present application, the junction box section includes a junction box body; the junction box body is open at both ends along the first direction; the junction box body is provided with a first chamber and a second chamber distributed along the second direction; the second direction is perpendicular to the first direction; the first chamber and the second chamber are connected; the end of the first chamber away from the second chamber is connected to the outside; the first chamber is used to accommodate the HDPE diaphragm; the second chamber is provided with a lock joint fixing assembly for plugging with the lock joint.

[0014] According to the technical solutions provided in certain embodiments of the present application, the cross-section of the junction box body is trapezoidal; the first chamber is arranged close to the short side of the trapezoid; and the second chamber is arranged close to the long side of the trapezoid.

[0015] According to the technical solution provided in certain embodiments of the present application, a through slit is provided on the side wall of the first chamber away from the second chamber, through which the HDPE membrane can pass; a first angle is formed between the depth direction of the through slit and the second direction; and the range of the first angle is 15° to 30°.

[0016] According to the technical solutions provided in certain embodiments of the present application, the through seam adopts a chamfered structure.

[0017] According to the technical solutions provided in certain embodiments of the present application, a tensioning member for tensioning the HDPE diaphragm is detachably provided in the first chamber.

[0018] According to the technical solutions provided in certain embodiments of the present application, the tensioning member is made of a flexible material and has a cylindrical structure, and its extending direction is parallel to the first direction.

[0019] According to the technical solutions provided in certain embodiments of the present application, the diameter of the tensioning member is greater than 60 mm.

[0020] According to the technical solutions provided in certain embodiments of the present application, the tensioning member is open at both ends and hollow inside.

[0021] According to the technical solution provided in certain embodiments of the present application, the lock joint fixing assembly includes a fixing frame; a fixed space is formed inside the fixing frame; a fixing member for coupling with the lock joint is detachably connected in the fixing space; one end of the fixing space is connected to the first chamber, and the other end is connected to the back panel of the box.

[0022] Compared with the existing technology, the beneficial effects of the present application are as follows: the construction method of the HDPE membrane composite flexible underground anti-seepage wall provided by the present application, when segmented or sequential construction or technical construction interruption is required, the locking joint of the HDPE membrane sheet at the end can be protected by adopting a joint box device. During subsequent construction, the joint box device is pulled out after the outer side of the joint box device is grooved, and then the HDPE membrane sheet is continuously and reliably locked. The installation and removal process of the joint box device does not damage the HDPE membrane sheet and its locking joint. The construction method of the HDPE membrane composite flexible underground anti-seepage wall provided by the present application enables the construction of the HDPE membrane composite flexible underground anti-seepage wall to be interrupted at any time, greatly reducing the construction difficulty and organizational management costs, ensuring the integrity of the HDPE membrane connection in the composite flexible underground anti-seepage wall, and improving the anti-seepage performance of the HDPE membrane composite flexible underground anti-seepage wall.

[0023] According to certain embodiments of the present application, the junction box device includes a plurality of junction box sections, each of which includes a junction box body with openings at both ends along a first direction, and a first chamber and a second chamber that are interconnected and distributed along a second direction within the junction box body. The first chamber is connected to the outside and can accommodate an HDPE diaphragm, and a lock joint fixing assembly capable of inserting a lock joint is provided in the second chamber. When in use, the junction box device is first hoisted so that it is located above the lock joint of the HDPE diaphragm to be protected, and the first chamber is aligned with the HDPE diaphragm, and the second chamber is aligned with the lock joint. Then, the junction box device is lowered from top to bottom to the application area of the HDPE diaphragm. In the working trench, the HDPE diaphragm is inserted in the first chamber, and the locking joint connected to the end of the HDPE diaphragm is plugged into the locking joint fixing assembly in the second chamber; before subsequent construction, the joint box device is lifted from the construction trench from top to bottom, so that the HDPE diaphragm is gradually separated from the first chamber, and the locking joint connected to the end of the HDPE diaphragm is gradually separated from the second chamber; the joint box device can realize the protection of the HDPE diaphragm locking joint during the technical segmentation, sequence construction or construction interruption of the construction process of HDPE membrane composite flexible underground anti-seepage wall with different wall thicknesses, avoid the difficulty of locking the HDPE diaphragm during subsequent construction, and ensure the construction efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a joint box device for an HDPE membrane composite flexible underground anti-seepage wall provided in an embodiment of the present application (not plugged into a locking joint of an HDPE membrane);

[0025] Figure 2 A schematic structural diagram of a joint box device (connected to a locking joint of an HDPE membrane) for a HDPE membrane composite flexible underground anti-seepage wall provided in an embodiment of the present application;

[0026] Figure 3 Schematic diagram of the construction of the HDPE membrane composite flexible underground anti-seepage wall provided in the embodiment of the present application.

[0027] The text annotations in the figure represent:

[0028] 101. HDPE diaphragm; 102. Lock joint;

[0029] 2. Connector box body; 201. First chamber; 202. Second chamber; 203. Through seam; 204. Box back panel;

[0030] 3. Tensioning parts;

[0031] 401, fixed frame; 402, fixed space; 403, fixed part; 404, opening;

[0032] 501, constructed section; 502, unconstructed section. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below with reference to the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present application.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] During the construction of HDPE membrane composite flexible underground anti-seepage walls with different wall thicknesses, technical segmentation or sequence construction, or technical construction interruption is often required. At this time, in order to avoid difficulties in locking the HDPE membrane sheets during subsequent construction, it is necessary to protect the locking joints connected to the ends of the HDPE membrane sheets in the constructed section.

[0036] This embodiment provides a construction method for a HDPE film composite flexible underground anti-seepage wall, which requires the use of Figure 1 The junction box device of the HDPE membrane composite flexible underground anti-seepage wall shown is used to protect the lock joint 102 connected to the end of the HDPE membrane sheet 101. The junction box device includes several junction box sections connected in sequence; each of the junction box sections has the same structure, and the junction box sections include a junction box body 2; the junction box body 2 is open at both ends along the first direction; the junction box body 2 is provided with a first chamber 201 and a second chamber 202 distributed along the second direction; the second direction is perpendicular to the first direction; the first chamber 201 and the second chamber 202 are connected; the end of the first chamber 201 away from the second chamber 202 is connected to the outside; the first chamber 201 is used to accommodate the HDPE membrane sheet 101; the second chamber 202 is provided with a lock joint fixing component for plugging with the lock joint 102.

[0037] Specifically, the junction box body 2 is mainly made of steel and plate in the factory; the first direction is Figure 1 In the direction perpendicular to the paper, the length direction of the junction box body 2 is the first direction, and the junction box body 2 is open at both ends along the first direction. In this embodiment, the cross-section of the junction box body 2 is a quadrilateral structure, that is, the junction box body 2 includes four plates connected end to end in sequence; the second direction is Figure 1The horizontal direction in the drawing is the left-right direction; a partition is provided inside the junction box body 2; the partition divides the interior of the junction box body 2 into a first chamber 201 and a second chamber 202 along the second direction; a connecting port is provided on the partition to connect the interiors of the first chamber 201 and the second chamber 202; the first chamber 201 is a chamber for placing the HDPE diaphragm 101, and the second chamber 202 is a chamber for protecting the lock joint 102.

[0038] When in use, the joint box device is first hoisted so that it is located above the HDPE membrane lock joint to be protected, and the first chamber 201 is aligned with the HDPE membrane 101, and the second chamber 202 is aligned with the lock joint 102; then the joint box device is lowered into the construction groove of the HDPE membrane from top to bottom, so that the HDPE membrane 101 is inserted into the first chamber 201, and the lock joint 102 connected to the end of the HDPE membrane 101 is plugged into the lock joint fixing component in the second chamber 202. Figure 2 Schematic diagram of the structure of the installed junction box device; before subsequent construction, the junction box device is lifted from the top down from the construction trench, so that the HDPE membrane 101 is gradually separated from the first chamber 201, and the locking joint 102 connected to the end of the HDPE membrane 101 is gradually separated from the second chamber 202.

[0039] The joint box device can protect the locking joints connected to the ends of the HDPE membranes in the constructed section, avoiding difficulties in locking the HDPE membranes during subsequent construction, and ensuring construction efficiency and quality.

[0040] Preferably, the cross section of the junction box body 2 is trapezoidal; the first chamber 201 is arranged close to the short side of the trapezoid; and the second chamber 202 is arranged close to the long side of the trapezoid.

[0041] Specifically, in this embodiment, the cross section of the junction box body 2 is an isosceles trapezoid, the plane of the cross section is perpendicular to the first direction and parallel to the second direction; the direction of the height of the trapezoid is parallel to the second direction; the first chamber 201 is formed by the partition, the short side of the trapezoid and part of the side; the second chamber 202 is formed by the partition, the long side of the trapezoid and another part of the side; when in use, the short side of the trapezoid structure is located on the side of the previous construction (i.e., the constructed section), and the long side of the trapezoid structure is located on the side of the subsequent construction (i.e., the unconstructed section). By adopting the above technical solution, the cross-sectional trapezoid of the junction box body is in open contact with the previous wall section, which facilitates the subsequent grooving of the junction box body to be pulled out of the previous wall section.

[0042] Furthermore, a through slit 203 is provided on the side wall of the first chamber 201 away from the second chamber 202, through which the HDPE membrane 101 can pass; a first angle is formed between the depth direction of the through slit 203 and the second direction; and the range of the first angle is 15° to 30°.

[0043] Specifically, the through-slit 203 is a channel connecting the first chamber 201 with the outside, and its length direction is the first direction and its depth direction is Figure 1 The direction indicated by the arrow in the middle; the through seam 203 is located in the middle of the box plate on the short side of the trapezoidal cross-section of the junction box body 2; the through seam 203 separates the box plate on the short side of the trapezoidal cross-section of the junction box body 2 into two unconnected parts; by adopting the inclined through seam 203, when the HDPE film passes through the through seam 203, it can effectively isolate the sealing slurry filled in the previous wall section.

[0044] Preferably, the through seam 203 is chamfered. The additional chamfering greatly reduces the risk of scratching and damaging the HDPE membrane during the installation and removal of the junction box.

[0045] Furthermore, a tensioning member 3 for tensioning the HDPE diaphragm 101 is detachably provided in the first chamber 201 .

[0046] Specifically, the tensioning member 3 is a cylindrical structure, the extension direction of which is parallel to the first direction, and the diameter of which is greater than 60 mm. When in use, after the joint box body 2 is lowered into the construction groove, the tensioning member 3 is inserted into the first chamber 201 from top to bottom, and is located near the through seam 203. By adjusting the position of the tensioning member 3, the entire HDPE membrane is tensioned, and the stretching amount of the HDPE membrane is reserved for the subsequent lifting and pulling activities of the joint box body.

[0047] Preferably, the tensioning member 3 is open at both ends and hollow inside. In the present embodiment, it is a hose with a diameter greater than 60 mm. When in use, a slurry that is not easy to solidify can be poured from the top of the hose. The slurry can flow out from the bottom of the hose and flow into the first chamber and the second chamber, so that the filler that may penetrate into the first chamber and the second chamber can be circulated, cleaned and replaced. The filler here refers to the slurry poured on both sides of the HDPE membrane in the construction groove during the previous construction.

[0048] Furthermore, the locking joint fixing assembly includes a fixing frame 401; a fixing space 402 is formed inside the fixing frame 401; a fixing part 403 for coupling with the locking joint 102 is detachably connected in the fixing space 402; one end of the fixing space 402 is connected to the first chamber 201, and the other end is connected to the box back panel 204.

[0049] Specifically, in this embodiment, the locking joint 102 includes a web and wing plates integrally formed with the web. On one side 403 of the web, a connecting concave buckle, an inverted L-shaped locking head, a convex circular locking head, and an end limiting piece are integrally arranged in sequence. The convex circular locking head has a connecting portion connected to the web and a cylindrical locking portion with an arc notch provided at one end of the connecting portion away from the web. The arc notch is arranged obliquely at 45°. The connecting concave buckle has a cylindrical locking through groove, and a communication port communicating with the outside is provided on the groove wall of the locking through groove. The size of the communication port is smaller than the cross-sectional diameter size of the locking through groove. The convex circular locking head can be mutually mated with the connecting concave buckle;

[0050] The fixing frame 401 has an approximate "U" - shaped structure. Its top is located at the communication port on the partition board, and an opening 404 is reserved at the top of the fixing frame 401. One end of the locking joint 102 is provided with a wing plate, which is fixedly welded to the HDPE membrane sheet 101 through the wing plate. The wing plate of the locking joint 102 can pass through the reserved opening 404. The fixing member 403 is anchored to the side wall of the fixing frame 401 by rivets and can be coupled with the locking joint 102. The structure of the fixing member 403 is the same as that of the locking joint 102. It also includes a web, wing plates integrally formed with the web, and a connecting concave buckle, an inverted L-shaped locking head, a convex circular locking head, and an end limiting piece integrally arranged in sequence on one side of the web. When the fixing member 403 is coupled with the locking joint 102, the convex circular locking head, the connecting concave buckle, and the inverted L-shaped locking head of the fixing member 403 are respectively mated with the connecting concave buckle, the convex circular locking head, and the inverted L-shaped locking head of the locking joint 102.

[0051] The construction method of the HDPE membrane composite flexible underground impervious wall provided in this embodiment, using the above-mentioned joint box device for the HDPE membrane composite flexible underground impervious wall, can effectively protect the construction of the HDPE membrane composite flexible underground impervious wall, and can meet the construction requirements for the integrity of the connection of HDPE membrane sheets in high-standard impervious barrier construction. Please refer to Figure 3 , the construction method of the HDPE membrane composite flexible underground impervious wall specifically includes the following steps:

[0052] Step S1: Excavate the construction trench and determine the first preset position and the second preset position in the construction trench;

[0053] When constructing the underground impervious wall, first, it is necessary to carry out the grooving operation of the underground impervious wall, that is, excavate and clean the hole according to the requirements to obtain a construction trench of a certain length for setting the HDPE membrane sheet. Secondly, it is necessary to determine the first preset position and the second preset position in the construction trench. The first preset position is the position for setting the HDPE membrane sheet, and the second preset position is the position for setting the joint box device.

[0054] Step S2: Lower the HDPE membrane sheet with a locking joint welded at the end to the first preset position;

[0055] The left and right ends of the HDPE diaphragm are both provided with locking joints. After the HDPE diaphragm is lowered to the first preset position, the locking joint at the left end is plugged and fixed with the locking joint at the right end of the previous HDPE diaphragm.

[0056] Step S3, lowering the junction box device to a second preset position, and plugging the junction box device into the locking connector;

[0057] Before installing the junction box device, it is necessary to assemble the junction box sections. Specifically, first, select a suitable number of junction box sections according to the depth of the construction groove, and then splice the junction box sections in turn through hoisting or special pulling equipment, and use pins to connect the junction box body 2 of the adjacent junction box sections to obtain an assembled junction box device; when the slot hole is deep, it can be installed and assembled at the edge of the hole.

[0058] When the joint box device is lowered, it is first hoisted so that it is located above the second preset position, that is, above the installed HDPE diaphragm lock joint, and the first chamber 201 is aligned with the HDPE diaphragm 101, and the second chamber 202 is aligned with the lock joint 102; then the joint box device is lowered from top to bottom to the second preset position in the construction groove of the HDPE diaphragm, so that the HDPE diaphragm 101 is inserted into the first chamber 201 through the through seam 203, and connected to the end of the HDPE diaphragm 101. The locking joint 102 is plugged into the locking joint fixing assembly 403 in the second chamber 202 through the opening 404. When the junction box device is lowered to the bottom of the construction groove, it is fixed on the construction platform of the notch of the construction groove. The specific fixing method can be: a mounting frame is set up at the notch of the construction groove, and the interface box body and the mounting frame are fixedly connected by screws, etc.; finally, a tensioning member 3 is set down in the first chamber 201, and the entire HDPE membrane is tightened by adjusting the position of the tensioning member 3, thereby reserving the stretching amount of the HDPE membrane for the subsequent lifting and pulling activities of the junction box device.

[0059] Step S4, pouring filling material into the construction groove;

[0060] Use filling material to pour into both sides of the HDPE membrane in the construction trench to replace the wall protection mud in the previous wall section, i.e., the constructed section 501 in the construction trench. During the pouring and replacement process, the box back plate 204 of the junction box device needs to be supported by the unexcavated original stratum or other materials to avoid deformation. Figure 3 The right side of the middle joint box device is an unconstructed section 502 , which can provide support for the box back plate 204 .

[0061] After the filling material is poured into the construction groove, it gradually begins to solidify. During the solidification process, the filling material that may penetrate into the first chamber 201 can be flushed and cleaned by circulating mud through the first chamber 201 and the tensioning member 3. The specific method is: slurry that is not easy to solidify (relative to the filling material) is poured from the top of the hose. The slurry can flow out from the bottom of the hose and flow into the first chamber and the second chamber. The filler that may exist in the first chamber and the second chamber can be circulated, cleaned and replaced. The filler here refers to the slurry poured on both sides of the HDPE membrane in the construction groove during the previous construction. Circulating cleaning can be achieved by setting a circulating pump at the notch of the construction groove.

[0062] Step S5: before the filling material solidifies and the subsequent membrane is set down, the joint box device is removed from the second preset position, and the locking joint is separated from the joint box device and kept intact.

[0063] When the filling material of the previous construction section in the construction trench solidifies, and when the subsequent slot hole excavation on the right side of the box back plate 204 of the junction box device is completed and the hole cleaning is nearing completion, the junction box device is removed from the second preset position. The specific operation method can be: use a crane or a special puller to first lift and remove the tensioning member 3 from the first chamber, and then lift and pull the junction box body 2 from the construction trench from top to bottom, so that the HDPE membrane 101 gradually detaches from the first chamber 201, and the locking joint 102 connected to the end of the HDPE membrane 101 gradually detaches from the second chamber 202. When the junction box device is completely separated from the locking joint, the HDPE membrane and the locking joint remain intact.

[0064] Next, repeat the above steps to prepare the next HDPE membrane sheet and install it in the next wall section. The locking joint on the left end of the next HDPE membrane sheet is plugged into the locking joint on the right end of the previous HDPE membrane sheet (i.e., the HDPE membrane sheet previously protected by the junction box assembly). This cycle is repeated, ensuring the continuity, integrity, and completeness of the continuous installation of HDPE membrane sheets through the junction box assembly.

[0065] The present invention effectively solves the problem of segmented or sequential construction or technical construction interruption during the construction of HDPE membrane composite flexible underground anti-seepage wall, and the problem of effective and reliable connection of HDPE membrane. The construction of HDPE membrane composite flexible underground anti-seepage wall can be interrupted at any time, which greatly reduces the construction difficulty and organization and management costs. It ensures the continuous integrity of the HDPE membrane while improving the anti-seepage performance of the HDPE membrane composite flexible underground anti-seepage wall. Its application has the following characteristics:

[0066] 1. Common steel and plates are used as the main structural materials of the joint box device, which is easy to process and realize;

[0067] 2. The segmented design of the joint box device is convenient for transportation and use. By selecting different numbers of joint box segments and connecting them in sequence, joint box devices of different lengths can be obtained, thereby meeting the construction requirements of HDPE membrane composite flexible underground anti-seepage walls of different depths;

[0068] 3. The setting of the HDPE diaphragm adjustment chamber (i.e., the first chamber) in the joint box device can reserve the stretching amount of the HDPE diaphragm to adapt to the displacement of the joint box device during the lifting and pulling process, eliminating the potential risk of the HDPE diaphragm being pulled and damaged during the lifting and pulling process of the joint box device;

[0069] 4. The design of the intermediate protection compartment (i.e., the second chamber) and the lock joint fixing assembly of the joint box device meets the construction requirements of HDPE membrane composite flexible underground anti-seepage walls with different filling materials and processes. The structure of the fixing member 403 is the same as that of the HDPE membrane lock joint and is anchored to the inner wall of the second chamber, enabling plug-in bite locking to provide complete protection for the lock joint hook.

[0070] 5. The setting and use of the adjustment hose (i.e., tensioning member) and the lock joint fixing assembly can adjust the reserved stretch of the HDPE film and protect the integrity of the lock joint hook, thereby achieving the continuous integrity of the HDPE film. At the same time, the adjustment hose can also be used as a circulation hose to achieve cleaning and replacement of the fillings in the first and second chambers.

[0071] 6. The trapezoidal short sides of the junction box body are reserved with angled gaps, which can effectively isolate and seal the slurry. At the same time, the additional chamfer treatment greatly reduces the risk of scratching and damaging the HDPE membrane during the installation and removal of the junction box. The overall design is trapezoidal, and the subsequent grooving and removal are smooth.

[0072] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can also make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A construction method for a HDPE film composite flexible underground anti-seepage wall, characterized in that: The method comprises the following steps: Step S1: excavating a construction trench and determining a first preset position and a second preset position in the construction trench; Step S2: lowering the HDPE diaphragm with a locking joint welded to the end to the first preset position; Step S3, lowering the junction box device to the second preset position, and plugging the junction box device into the locking connector; Step S4, pouring filling material into the construction groove; Step S5: before the filling material solidifies and the subsequent diaphragm is lowered, the joint box device is removed from the second preset position, and the locking connector is separated from the joint box device and kept intact; The joint box section comprises a joint box body (2); the joint box body (2) is open at both ends along a first direction; a first chamber (201) and a second chamber (202) are distributed in the joint box body (2) along a second direction; the second direction is perpendicular to the first direction; the first chamber (201) and the second chamber (202) are communicated; an end of the first chamber (201) away from the second chamber (202) is communicated with the outside; the first chamber (201) is used to accommodate the HDPE diaphragm (101); a lock joint fixing assembly for plugging with the lock joint (102) is provided in the second chamber (202); A tensioning member (3) for tensioning the HDPE diaphragm (101) is detachably provided in the first chamber (201).

2. The construction method of the HDPE film composite flexible underground anti-seepage wall according to claim 1, characterized in that: In step S3, before the junction box device is lowered to the second preset position, a suitable number of junction box sections are selected according to the depth of the construction trench, and the junction box sections are sequentially spliced and installed to obtain the junction box device.

3. The construction method of the HDPE film composite flexible underground anti-seepage wall according to claim 1, characterized in that: The cross section of the junction box body (2) is trapezoidal; the first chamber (201) is arranged close to the short side of the trapezoid; and the second chamber (202) is arranged close to the long side of the trapezoid.

4. The construction method of the HDPE film composite flexible underground anti-seepage wall according to claim 1, characterized in that: A through slit (203) for the HDPE membrane (101) to pass through is provided on the side wall of the first chamber (201) away from the second chamber (202); a first angle is formed between the through slit (203) and the second direction; and the range of the first angle is 15° to 30°.

5. The construction method of the HDPE film composite flexible underground anti-seepage wall according to claim 4, characterized in that: The through seam (203) adopts a chamfered structure.

6. The construction method of the HDPE film composite flexible underground anti-seepage wall according to claim 1, characterized in that: The tensioning member (3) is made of a flexible material and has a cylindrical structure, and its extension direction is parallel to the first direction.

7. The construction method of the HDPE film composite flexible underground anti-seepage wall according to claim 1, characterized in that: The tensioning member (3) is open at both ends and hollow inside.

8. The construction method of the HDPE film composite flexible underground anti-seepage wall according to claim 1, characterized in that: The lock joint fixing assembly comprises a fixing frame (401); a fixing space (402) is formed inside the fixing frame (401); a fixing member (403) for coupling with the lock joint (102) is detachably connected in the fixing space (402); one end of the fixing space (402) is connected to the first chamber (201), and the other end is connected to the box back plate (204).

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