In-situ mixing construction method of homogeneous mortar of geomembrane composite cutoff wall

Abstract

The application discloses a homogeneous mortar in-situ stirring construction method of a geomembrane composite anti-seepage wall, and aims to provide the homogeneous mortar in-situ stirring construction method of the geomembrane composite anti-seepage wall which can effectively control the sediment at the bottom of the groove, thereby effectively solving the problem that the sediment at the bottom of the groove cannot be controlled in the mortar in-situ stirring construction method in the prior art, and the quality of the geomembrane composite anti-seepage wall is affected. It comprises the following steps: constructing an anti-seepage wall groove, groove forming machinery cuts and stirs to form the anti-seepage wall groove in a foundation; in the process, a mud reverse circulation device is used to pump out the sediment at the bottom of the anti-seepage wall groove and mud to a mud sedimentation tank, and the mud is subjected to sedimentation and filtration in the mud sedimentation tank; the mud subjected to the sedimentation and filtration in the mud sedimentation tank is pumped into a mud preparation device, and then the mud preparation device inputs the mud into the bottom of the anti-seepage wall groove; homogeneous mortar stirring; and laying a geomembrane, the geomembrane is laid in the homogeneous mortar of the anti-seepage wall groove.

Description

Technical Field

[0001] This invention relates to the field of geomembrane composite seepage barrier construction, specifically to a method for in-situ mixing of homogeneous mortar for geomembrane composite seepage barrier construction. Background Technology

[0002] Currently, in existing contaminated site remediation projects, vertical seepage barriers mainly adopt geomembrane composite seepage barriers. These barriers consist of a geomembrane at the center of the wall and mortar surrounding it. The mortar is typically made of cement-soil or clay-bentonite. Mortar preparation can be done in two ways: on-site mixing and subsequent injection through trench holes. In-situ injection involves preparing the mortar on the ground and then injecting it through the trench holes. While this method ensures reliable mortar quality, it involves more construction steps, cannot utilize the granular components of the in-situ soil, and has higher construction costs. On-site mixing is simpler and utilizes the granular components of the in-situ soil, but it cannot remove substandard particles, making it difficult to control sediment at the bottom of the trench. This not only results in poor mortar quality at the bottom of the trench but also makes laying the vertical seepage barrier geomembrane difficult, as the bottom end of the geomembrane is not properly laid, severely affecting the quality of the geomembrane composite seepage barrier. Summary of the Invention

[0003] The purpose of this invention is to provide a homogeneous mortar in-situ mixing construction method for geomembrane composite seepage prevention walls that can effectively control sediment at the bottom of the trench, thereby effectively solving the problem in the prior art where the sediment at the bottom of the trench cannot be controlled, resulting in poor mortar quality and difficulty in laying geomembrane, which affects the quality of geomembrane composite seepage prevention walls.

[0004] The technical solution of this invention is: A method for in-situ mixing of homogeneous mortar in geomembrane composite seepage barrier construction, employing trenching machinery, slurry reverse circulation equipment, slurry preparation equipment, and slurry sedimentation tank, wherein the trenching machinery includes a chainsaw cutting box, and the method for in-situ mixing of homogeneous mortar in geomembrane composite seepage barrier construction includes the following steps in sequence: The trenching for the anti-seepage wall is constructed by using a chainsaw cutting box to cut and mix the soil within the foundation to form the anti-seepage wall trench. During the construction of the anti-seepage wall trench, a mud reverse circulation equipment is used to extract the bottom sediment and mud from the bottom of the anti-seepage wall trench into a mud sedimentation tank for sedimentation and filtration. The mud after sedimentation and filtration in the mud sedimentation tank is then pumped into a slurry preparation equipment, which then inputs the mud into the bottom of the anti-seepage wall trench, where it is repeatedly circulated and mixed by the trenching machinery. After the anti-seepage wall trench is constructed and formed, the slurry mixing equipment injects cement and additives into the anti-seepage wall trench and cuts and mixes them through the trenching machinery to form a homogeneous mortar in the anti-seepage wall trench. Lay the geomembrane in the homogeneous mortar of the anti-seepage wall trench.

[0005] This scheme's method for constructing a geomembrane composite seepage barrier wall using in-situ homogeneous mortar mixing also employs mortar mixed on-site. However, during the construction of the seepage barrier trench, a slurry reverse circulation system is used to extract bottom sediment and slurry from the trench into a slurry settling tank for sedimentation and filtration. The slurry, after sedimentation and filtration, is then pumped into a slurry preparation system, which in turn feeds the slurry into the bottom of the seepage barrier trench, where it is repeatedly circulated and mixed by the trenching machinery. This process ensures the seepage barrier trench is properly constructed. The bottom sediment (i.e., large particles of sand and soil) is carried to the mud sedimentation tank on the ground, thereby effectively controlling the sediment at the bottom of the trench. The fine clay particles in the in-situ soil are not easy to settle and remain in the trench through mud circulation, which increases the density and viscosity of the mud in the anti-seepage wall trench, providing a reliable guarantee for the subsequent preparation of homogeneous mortar. This can effectively solve the problem in the existing technology where the sediment at the bottom of the trench cannot be controlled by the in-situ mixed mortar, resulting in poor quality mortar at the bottom of the trench, difficulty in laying geomembrane, and thus affecting the quality of geomembrane composite anti-seepage wall.

[0006] Preferably, the trenching machinery is a TRD device or a CSM device.

[0007] Preferably, the chainsaw cutting box is equipped with grouting pipes. The slurry from the slurry preparation equipment is injected into the grouting pipes inside the chainsaw cutting box via a grouting pump, and then injected into the bottom of the chainsaw cutting box through the grouting pipes. In this way, the slurry, after sedimentation and filtration in the slurry sedimentation tank, can be reinjected into the bottom of the chainsaw cutting box through the grouting pipes, and repeatedly participate in the cutting and mixing of the trenching machinery.

[0008] As a preferred option, the mud reverse circulation equipment includes: The traveling vehicle is equipped with suction tubes that extend vertically. Connect the hose to the upper end of the suction pipe and connect it to the mud settling tank. A suction pump, which is installed on a suction pipe or connecting hose; During the construction of the anti-seepage wall trench, the suction pipe extends into the anti-seepage wall trench, with the lower end of the suction pipe close to the bottom of the anti-seepage wall trench. The mud reverse circulation equipment uses a suction pump, suction pipe and connecting hose to pump the bottom sediment and mud from the bottom of the anti-seepage wall trench into the mud sedimentation tank for sedimentation and filtration.

[0009] Preferably, during the construction of the anti-seepage wall trench, the traveling vehicle moves the suction pipe horizontally along the length of the trench to maintain a set distance between the suction pipe and the chainsaw cutting box. This effectively removes bottom sediment from various parts of the anti-seepage wall trench, effectively controlling the sediment at the bottom of the trench and providing a reliable guarantee for the subsequent preparation of homogeneous mortar.

[0010] Preferably, the distance between the lower end of the suction pipe and the bottom of the anti-seepage wall trench is 10-50 cm.

[0011] Preferably, the following steps are included before constructing the anti-seepage wall trench: Excavate surface trenches, and mark the center line of the wall with mortar while excavating surface trenches; The embedded box is hoisted and placed. An embedded hole is excavated at the beginning of the surface trench. The embedded box is hoisted into the embedded hole and then backfilled with soil in the gaps around the embedded box. The chainsaw cutting box is hoisted and placed. The chainsaw cutting box consists of several cutting box sections. The cutting box sections are hoisted into the pre-embedded box and connected as a whole. Then the pre-embedded box is hoisted away and the pre-embedded holes are backfilled and compacted. The chainsaw cutting box is inserted into the ground, the trenching machine is in place, then the main unit of the trenching machine is connected to the chainsaw cutting box, and then the cutting box body of the chainsaw cutting box is connected section by section and sunk into the ground until the bottom of the chainsaw cutting box reaches the designed wall bottom elevation.

[0012] As a preferred option, the specific procedures for laying geomembrane are as follows. Install a counterweight device at the bottom of the geomembrane; Next, a geomembrane is laid in the homogeneous mortar of the anti-seepage wall trench using a membrane spreading frame or a membrane laying machine.

[0013] Preferably, there are several counterweight devices, each distributed sequentially along the bottom edge of the geomembrane. Each counterweight device includes two counterweight components symmetrically distributed on opposite sides of the geomembrane. Each counterweight component includes: Adhesive blocks are fixed to the lower part of the geomembrane; A counterweight block is suspended below the adhesive block by a connecting rope. The bottom end of the counterweight block is at the same height as the bottom end of the geomembrane, or the bottom end of the counterweight block is higher than the bottom end of the geomembrane. In this design, during the laying process and after reaching the bottom of the trench, the geomembrane within the anti-seepage wall trench remains in a vertically tensile state under the weight of the counterweight block, effectively solving the problems of geomembrane twisting and floating. Simultaneously, two counterweight components are distributed on opposite sides of the geomembrane. During laying, the counterweight block can cooperate with the inner wall of the anti-seepage wall trench to provide preliminary auxiliary positioning for the bottom of the geomembrane, ensuring that the bottom of the geomembrane is inserted into the center of the wall after reaching the bottom of the trench. Furthermore, having the bottom end of the counterweight block at the same height as the bottom end of the geomembrane, or the bottom end of the counterweight block higher than the bottom end of the geomembrane, ensures that the bottom of the geomembrane is tightly against the bottom of the trench after it is laid.

[0014] Preferably, it also includes a bottom-reaching centering support mechanism, which corresponds one-to-one with the counterweight components. The bottom-reaching centering support mechanism includes: The support is a diagonal rod, the lower end of which is hinged to the corresponding counterweight, and the upper end of which extends diagonally upwards and outwards from the counterweight. Support rod, which is fixed to the upper end of the support diagonal rod; Vertical guide holes are set on the corresponding counterweights and penetrate through the counterweights; The top support rod passage is set on the outer side of the corresponding counterweight block and connected to the vertical guide hole; The top support rod is set on the upper part of the support diagonal rod, and the end of the top support rod passes through the top support rod opening and extends into the vertical guide hole; A floating locking rod is slidably installed in a vertical guide hole. The bottom end of the floating locking rod is located below the bottom end of the geomembrane. The top of the floating locking rod is provided with a locking slope. The top support rod faces the locking slope, and there is a gap between the end of the top support rod and the locking slope.

[0015] During the process of laying the geomembrane from top to bottom into the anti-seepage wall trench, the supporting top rod abuts against the inner wall of the anti-seepage wall trench under its own weight, and the supporting top rod can rotate around the hinge axis at the lower end of the supporting inclined rod towards the geomembrane; when the bottom of the geomembrane is laid to the bottom of the anti-seepage wall trench, the floating locking rod is supported at the bottom of the anti-seepage wall trench and moves upward along the vertical guide hole so that the locking inclined surface abuts against the end of the top support rod.

[0016] While counterweights placed on both sides of the geomembrane can provide initial positioning assistance for the bottom of the geomembrane, a sufficient gap (typically 10-20 cm) must be maintained between the counterweights and the inner wall of the trench to ensure smooth installation. This prevents the geomembrane from being accurately centered within the wall, and the counterweights may tilt after the geomembrane reaches the bottom of the trench, further affecting the geomembrane's placement. To address this issue, this solution incorporates a bottom-contact centering support mechanism. This mechanism, without hindering the smooth installation of the geomembrane, positions the bottom of the geomembrane at the center of the wall after it reaches the bottom of the trench, preventing the counterweights from tilting and thus ensuring the correct geomembrane placement.

[0017] The beneficial effects of this invention are as follows: A reverse circulation mud device is used to extract the bottom sediment and mud from the bottom of the anti-seepage wall trench into a mud sedimentation tank for sedimentation and filtration. The slurry after sedimentation and filtration is then pumped into a slurry preparation device, which then feeds the slurry into the bottom of the anti-seepage wall trench, where it repeatedly participates in the cutting and mixing of the trenching machinery. This effectively controls the bottom sediment (i.e., large particles of sand and soil) and brings it to the mud sedimentation tank on the ground, thus effectively controlling the sediment at the bottom of the trench. Fine clay particles in the in-situ soil are less likely to settle and remain in the trench after mud circulation, increasing the density and viscosity of the anti-seepage wall trench mud, providing a reliable guarantee for the subsequent preparation of homogeneous mortar. This effectively solves the problem in existing technologies where the in-situ mixed mortar has uncontrollable bottom sediment, leading to poor mortar quality and difficulties in geomembrane laying, which affects the quality of the geomembrane composite anti-seepage wall. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the construction process of a homogeneous mortar in-situ mixing construction method for a geomembrane composite seepage barrier wall according to the present invention.

[0019] Figure 2 This is a partial structural diagram of the present invention during the process of laying geomembrane.

[0020] In the picture: Grooving machine 1, chainsaw cutting box 1.1; 2. Mud reverse circulation equipment, 2.1. Suction pipe; Pulping equipment 3; Construction of mud sedimentation tank 4; 5. Anti-seepage wall trench; Geomembrane 6; Counterweight assembly 7, adhesive block 7.1, connecting rope 7.2, counterweight block 7.3, bottom slope 7.4; Bottom-reaching centering support mechanism 8, support diagonal rod 8.1, support top rod 8.2, top support rod 8.3, vertical guide hole 8.4, top support rod through-hole 8.5, floating locking rod 8.6, locking inclined surface 8.7. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Specific Implementation Example 1, such as Figure 1 As shown, a method for in-situ mixing of homogeneous mortar for geomembrane composite seepage prevention wall is described, employing trenching machinery 1, slurry reverse circulation equipment 2, slurry preparation equipment 3, and slurry sedimentation tank construction 4. The trenching machinery includes a chainsaw cutting box 1.1; in this embodiment, the trenching machinery is a TRD device or a CSM device. The slurry reverse circulation equipment and slurry preparation equipment are existing technologies, and their specific structures are not the inventive points of this application. Therefore, this application will not elaborate on the specific methods and structures of the slurry reverse circulation equipment and slurry preparation equipment, or other conventional technical means.

[0022] A method for in-situ mixing of homogeneous mortar for geomembrane composite seepage prevention wall, comprising the following steps: The construction of the anti-seepage wall trench involves the trenching machinery using a chainsaw cutting box to cut and mix within the foundation to form the anti-seepage wall trench 5.

[0023] During the construction of the anti-seepage wall trench, a mud reverse circulation device 2 is used to extract the bottom sediment and mud from the bottom of the anti-seepage wall trench into a mud sedimentation tank for sedimentation and filtration. The mud after sedimentation and filtration in the mud sedimentation tank is then pumped into a slurry preparation device, which then inputs the mud into the bottom of the anti-seepage wall trench, where it is repeatedly circulated and mixed by the trenching machinery. Specifically, a grouting pipe is installed inside the chainsaw cutting box. The mud in the slurry preparation device is injected into the grouting pipe inside the chainsaw cutting box through a grouting pump, and then injected into the bottom of the chainsaw cutting box through the grouting pipe, where it is repeatedly circulated and mixed by the trenching machinery.

[0024] After the anti-seepage wall trench is constructed and formed, the slurry mixing equipment injects cement and additives into the anti-seepage wall trench, and the trenching machinery cuts and mixes the mixture to form a homogeneous mortar within the anti-seepage wall trench. Additives include bentonite, modifiers, retarders, and water-reducing agents.

[0025] Lay the geomembrane in the homogeneous mortar of the anti-seepage wall trench.

[0026] The homogeneous mortar in-situ mixing construction method for the geomembrane composite seepage barrier wall in this embodiment also uses mortar mixed in situ. However, during the construction of the seepage barrier wall trench, a slurry reverse circulation device is used to pump the bottom sediment and slurry from the bottom of the trench into a slurry sedimentation tank for sedimentation and filtration. The slurry after sedimentation and filtration is then pumped into a slurry preparation device, which then feeds the slurry into the bottom of the seepage barrier wall trench, where it is repeatedly circulated and mixed by the trenching machinery. In this way, the seepage barrier wall trench can be constructed... The bottom sediment (i.e., large particles of sand and soil) is carried to the mud sedimentation tank on the ground, thereby effectively controlling the sediment at the bottom of the trench. The fine clay particles in the in-situ soil are not easy to settle and remain in the trench through mud circulation, which increases the density and viscosity of the mud in the anti-seepage wall trench, providing a reliable guarantee for the subsequent preparation of homogeneous mortar. This can effectively solve the problem in the existing technology where the sediment at the bottom of the trench cannot be controlled by the in-situ mixed mortar, resulting in poor quality of the mortar at the bottom of the trench, difficulty in laying the geomembrane, and thus affecting the quality of the geomembrane composite anti-seepage wall.

[0027] Specific embodiment two, such as Figure 1 As shown, a method for in-situ mixing of homogeneous mortar for geomembrane composite seepage prevention wall is described, employing trenching machinery 1, slurry reverse circulation equipment 2, slurry preparation equipment 3, and slurry sedimentation tank construction 4. The trenching machinery includes a chainsaw cutting box 1.1; in this embodiment, the trenching machinery is a TRD device or a CSM device. The slurry reverse circulation equipment and slurry preparation equipment are existing technologies, and their specific structures are not the inventive points of this application. Therefore, this application will not elaborate on the specific methods and structures of the slurry reverse circulation equipment and slurry preparation equipment, or other conventional technical means.

[0028] A method for in-situ mixing of homogeneous mortar for geomembrane composite seepage prevention wall, comprising the following steps: Excavate surface trenches, marking the center line of the wall with mortar before excavating. In this embodiment, the surface trench is 1-1.5 meters wide, 1-1.4 meters deep, and no more than 50 meters long. The surface trench should not be excavated too deep to prevent collapse. If there are underground obstacles at the construction site of the surface trench, these obstacles must be removed first, and the original soil must be backfilled and compacted before excavating the surface trench.

[0029] The embedded box is hoisted and placed, and embedded holes are excavated at the beginning of the surface trench. The depth of the embedded hole is 2-4m, the length is 1.5-3m, and the width is about 0.8-1.2m. The embedded box is hoisted into the embedded hole, and then the gaps around the embedded box are backfilled with soil.

[0030] The chainsaw cutting box, which consists of several cutting box sections, is hoisted and lowered into the pre-embedded box section by section and connected as a whole. Then, the pre-embedded box is hoisted away, and the pre-embedded holes are backfilled and compacted.

[0031] The chainsaw cutting box is inserted into the ground, and the trenching machine is positioned. Next, the main unit of the trenching machine is connected to the chainsaw cutting box. Then, the cutting box sections are connected one by one and sunk into the ground until the bottom of the chainsaw cutting box reaches the designed wall elevation. The specific steps for inserting the chainsaw cutting box into the ground are existing technology and not the inventive point of this application; therefore, this application will not elaborate on the specific steps for inserting the chainsaw cutting box into the ground or other conventional technical means.

[0032] The construction of the anti-seepage wall trench involves the trenching machinery using a chainsaw cutting box to cut and mix within the foundation to form the anti-seepage wall trench 5.

[0033] During the construction of the anti-seepage wall trench, a mud reverse circulation device 2 is used to extract the bottom sediment and mud from the bottom of the anti-seepage wall trench into a mud sedimentation tank for sedimentation and filtration. The mud after sedimentation and filtration in the mud sedimentation tank is then pumped into a slurry preparation device, which then inputs the mud into the bottom of the anti-seepage wall trench, where it is repeatedly circulated and mixed by the trenching machinery. Specifically, a grouting pipe is installed inside the chainsaw cutting box. The mud in the slurry preparation device is injected into the grouting pipe inside the chainsaw cutting box through a grouting pump, and then injected into the bottom of the chainsaw cutting box through the grouting pipe, where it is repeatedly circulated and mixed by the trenching machinery.

[0034] After the anti-seepage wall trench is constructed and formed, the slurry mixing equipment injects cement and additives into the anti-seepage wall trench, and the trenching machinery cuts and mixes the mixture to form a homogeneous mortar within the anti-seepage wall trench. Additives include bentonite, modifiers, retarders, and water-reducing agents.

[0035] Lay the geomembrane in the homogeneous mortar of the anti-seepage wall trench.

[0036] The homogeneous mortar in-situ mixing construction method for the geomembrane composite seepage barrier wall in this embodiment also uses mortar mixed in situ. However, during the construction of the seepage barrier wall trench, a slurry reverse circulation device is used to pump the bottom sediment and slurry from the bottom of the trench into a slurry sedimentation tank for sedimentation and filtration. The slurry after sedimentation and filtration is then pumped into a slurry preparation device, which then feeds the slurry into the bottom of the seepage barrier wall trench, where it is repeatedly circulated and mixed by the trenching machinery. In this way, the seepage barrier wall trench can be constructed... The bottom sediment (i.e., large particles of sand and soil) is carried to the mud sedimentation tank on the ground, thereby effectively controlling the sediment at the bottom of the trench. The fine clay particles in the in-situ soil are not easy to settle and remain in the trench through mud circulation, which increases the density and viscosity of the mud in the anti-seepage wall trench, providing a reliable guarantee for the subsequent preparation of homogeneous mortar. This can effectively solve the problem in the existing technology where the sediment at the bottom of the trench cannot be controlled by the in-situ mixed mortar, resulting in poor quality mortar at the bottom of the trench, difficulty in laying geomembrane, and thus affecting the quality of geomembrane composite anti-seepage wall.

[0037] In specific embodiment three, the construction method of the homogeneous mortar in-situ mixing construction method for a geomembrane composite seepage barrier wall is the same as that in specific embodiment one or specific embodiment two, except that... like Figure 1 As shown, the mud reverse circulation device 2 includes a traveling vehicle, a connecting hose, and a suction pump. The traveling vehicle is equipped with a suction pipe 2.1 extending vertically. The connecting hose connects the upper end of the suction pipe to the mud settling tank. The suction pump is mounted on either the suction pipe or the connecting hose.

[0038] During the construction of the anti-seepage wall trench, the suction pipe extends into the trench, with its lower end close to the bottom. The distance between the lower end of the suction pipe and the bottom of the trench is 10-50 cm. The mud reverse circulation equipment uses a suction pump, suction pipe, and connecting hose to extract the bottom sediment and mud from the anti-seepage wall trench into a mud settling tank for sedimentation and filtration.

[0039] Furthermore, during the construction of the anti-seepage wall trench, the traveling vehicle moves the suction pipe horizontally along the length of the trench to maintain a set distance between the suction pipe and the chainsaw cutting box. This set distance is 1-2 meters. This effectively removes bottom sediment from various parts of the anti-seepage wall trench, effectively controlling the sediment at the bottom of the trench and providing a reliable guarantee for the subsequent preparation of homogeneous mortar.

[0040] In specific embodiment four, the construction method of the homogeneous mortar in-situ mixing construction method for a geomembrane composite seepage barrier wall is the same as that in specific embodiment one, two, or three, except that... The specific steps for laying geomembrane are as follows. A counterweight is installed at the bottom of the geomembrane. Several counterweights are installed, arranged sequentially along the bottom edge of the geomembrane. The distance between two adjacent counterweights is 1-3 meters.

[0041] Next, a geomembrane is laid in the homogeneous mortar of the anti-seepage wall trench using a membrane spreading frame or a membrane laying machine.

[0042] Furthermore, such as Figure 2As shown, the counterweight device includes two counterweight components 7, symmetrically distributed on opposite sides of the geomembrane 6. Each counterweight component 7 includes an adhesive block 7.1 and a counterweight block 7.3. The adhesive block is fixed to the lower part of the geomembrane by either bonding or hot-melt welding. In this embodiment, the adhesive block is fixed to the lower part of the geomembrane by hot-melt welding, and the adhesive block and the geomembrane are made of the same material. The adhesive block is located near the bottom of the geomembrane. The counterweight block is a precast reinforced concrete block. The counterweight block is suspended below the adhesive block by a connecting rope 7.2. The bottom end of the counterweight block is at the same height as the bottom end of the geomembrane, or the bottom end of the counterweight block is higher than the bottom end of the geomembrane. In this embodiment, the bottom end of the counterweight block is at the same height as the bottom end of the geomembrane. Each counterweight component consists of one counterweight block.

[0043] In this embodiment, during the laying process and after being laid to the bottom of the trench, the geomembrane within the anti-seepage wall trench remains in a vertically tensile state under the weight of the counterweights, effectively solving the problems of geomembrane twisting and floating. Simultaneously, two counterweight components are distributed on opposite sides of the geomembrane. During laying, the counterweights work in conjunction with the inner wall of the anti-seepage wall trench to provide preliminary auxiliary positioning for the bottom of the geomembrane, ensuring that the bottom of the geomembrane is inserted into the center of the wall after being laid to the bottom of the trench. Furthermore, the bottom end of the counterweight is at the same height as the bottom end of the geomembrane, or the bottom end of the counterweight is higher than the bottom end of the geomembrane, thus ensuring that the bottom of the geomembrane is firmly against the bottom of the trench after being laid.

[0044] Furthermore, the bottom of the counterweight block is provided with a bottom slope 7.4. The bottom slopes of the counterweight blocks in the two counterweight components of the same counterweight device form a V-shaped structure. This facilitates the counterweight block in driving the geomembrane into the anti-seepage wall trench.

[0045] Furthermore, such as Figure 2 As shown, the counterweight device also includes a bottom-aligning support mechanism 8. Each bottom-aligning support mechanism corresponds to one of the counterweight components. In this embodiment, the bottom-aligning support mechanisms on the two counterweight components of the same counterweight device are distributed on opposite sides of the geomembrane.

[0046] The bottom-reaching centering support mechanism 8 includes a support diagonal rod 8.1, a support top rod 8.2, a vertical guide hole 8.4, a top support rod passage 8.5, a top support rod 8.3, and a floating locking rod 8.6. The lower end of the support diagonal rod 8.1 is hinged to the counterweight block of the corresponding counterweight assembly. The upper end of the support diagonal rod extends obliquely upwards and outwards from the counterweight block. In this embodiment, the support diagonal rod and the corresponding counterweight block are connected by a connecting line.

[0047] The support rod 8.2 is fixed to the upper end of the support diagonal rod. In this embodiment, the support rod is parallel to the geomembrane, the support rod is horizontally distributed, and the support rod is parallel to the hinge axis at the lower end of the support diagonal rod.

[0048] A vertical guide hole 8.4 is provided on the corresponding counterweight and passes through the counterweight. A top support rod through-hole 8.5 is provided on the outer side of the corresponding counterweight and connects to the vertical guide hole.

[0049] The top support rod 8.3 is installed on the upper part of the support diagonal rod. The end of the top support rod passes through the top support rod passage and extends into the vertical guide hole.

[0050] The floating locking rod 8.6 is slidably mounted within the vertical guide hole. In this embodiment, the upper end of the floating locking rod is connected to the top of the counterweight block via a suspension rope, allowing the floating locking rod to be suspended within the vertical guide hole. The bottom end of the floating locking rod is located below the vertical guide hole and below the bottom end of the geomembrane. A locking ramp 8.7 is provided at the top of the floating locking rod, with the upper part of the ramp sloping towards the geomembrane. The top support rod faces the locking ramp, and a gap is provided between the end of the top support rod and the locking ramp.

[0051] During the process of laying the geomembrane from top to bottom into the anti-seepage wall trench 5, the supporting top rod abuts against the inner wall of the anti-seepage wall trench under its own weight, and the supporting top rod can rotate around the hinge axis at the lower end of the supporting inclined rod towards the geomembrane.

[0052] When the geomembrane is laid at the bottom of the anti-seepage wall trench, the floating locking rod is supported at the bottom of the anti-seepage wall trench and moves upward along the vertical guide hole so that the locking slope abuts against the end of the top support rod.

[0053] While counterweights placed on both sides of the geomembrane can provide initial, auxiliary positioning for the bottom of the geomembrane, a sufficient gap (typically 10-20 cm) must be maintained between the counterweights and the inner wall of the trench to ensure smooth installation. This prevents the geomembrane from being accurately centered within the wall, and the counterweights may tilt after the geomembrane reaches the bottom of the trench, further affecting the geomembrane's placement. To address this issue, this solution incorporates a bottom-contact centering support mechanism. This mechanism, without hindering smooth geomembrane installation, positions the bottom of the geomembrane at the center of the wall after it reaches the trench bottom, preventing the counterweights from tilting and affecting the geomembrane's placement. Specifically… During the process of laying the geomembrane from top to bottom into the anti-seepage wall trench, the supporting top rod abuts against the inner wall of the anti-seepage wall trench under its own weight, and the supporting top rod can rotate around the hinge axis at the lower end of the supporting diagonal rod towards the geomembrane; thus, during the geomembrane laying process, when the top rod encounters an obstacle on the inner wall of the anti-seepage wall trench (such as a protrusion on the inner wall of the anti-seepage wall trench), the supporting top rod can rotate around the hinge axis at the lower end of the supporting diagonal rod towards the geomembrane, thereby bypassing the obstacle and ensuring the smooth laying of the geomembrane.

[0054] When the bottom of the geomembrane is laid to the bottom of the anti-seepage wall trench, the bottom end of the floating locking rod is supported at the bottom of the anti-seepage wall trench and moves upward along the vertical guide hole so that the locking inclined surface abuts against the end of the top support rod. Specifically, when the geomembrane is close to the bottom of the anti-seepage wall trench, the bottom end of the floating locking rod is first supported at the bottom of the anti-seepage wall trench. Then the counterweight continues to move downward until it is supported at the bottom of the anti-seepage wall trench. During this process, the floating locking rod moves upward along the vertical guide hole so that the locking inclined surface abuts against the end of the top support rod. The top support rod drives the support rod to rotate around the hinge axis at the lower end of the support inclined rod to the outside of the counterweight, so that the support rod abuts against the inner wall of the anti-seepage wall trench, thereby centering and positioning the bottom of the geomembrane at the center of the wall. At the same time, the bottom-contact centering support mechanism supports the counterweight to prevent the counterweight from tilting and affecting the placement position of the bottom of the geomembrane.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for in-situ mixing of homogeneous mortar in geomembrane composite seepage barrier construction, employing trenching machinery, slurry reverse circulation equipment, slurry preparation equipment, and slurry sedimentation tank, characterized in that... The steps are as follows: The trenching for the anti-seepage wall is constructed by using a chainsaw cutting box to cut and mix the soil within the foundation to form the anti-seepage wall trench. In this process, a mud reverse circulation device is used to extract the bottom sediment and mud from the bottom of the anti-seepage wall trench to a mud sedimentation tank for sedimentation and filtration. The sedimented and filtered mud is then pumped into a slurry preparation device, which inputs the mud into the bottom of the anti-seepage wall trench and circulates repeatedly to participate in the cutting and mixing of the trenching machinery. After the anti-seepage wall trench is formed, the slurry mixing equipment injects cement and additives into the anti-seepage wall trench, and the trenching machinery cuts and mixes them to form a homogeneous mortar. The geomembrane is laid within the homogeneous mortar of the anti-seepage wall trench. The specific operation is as follows: A counterweight device is installed at the bottom of the geomembrane, which includes: Two counterweight components, symmetrically distributed on both sides of the geomembrane, include: Adhesive blocks are placed at the bottom of the geomembrane; The counterweight is suspended below the adhesive block; The bottoming-out support mechanisms include: The support diagonal bar is hinged at the lower end to the counterweight and extends diagonally upwards outwards from the counterweight at the upper end. The supporting top rod is fixed to the upper end of the supporting diagonal rod and is parallel to the geomembrane. Under its own weight, it abuts against the inner wall of the anti-seepage wall trench. Vertical guide holes are provided on the counterweight; The top support rod is located on the outer surface of the counterweight and connected to the vertical guide hole; The floating locking rod is slidably installed in the vertical guide hole, with a locking ramp at the top and its bottom end located below the vertical guide hole and the bottom end of the geomembrane. A top support rod is installed on the upper part of the support diagonal rod, passes through the top support rod passage and faces the locking slope.

2. The method for in-situ mixing of homogeneous mortar for geomembrane composite seepage prevention wall according to claim 1, characterized in that, The trenching machinery is either a TRD device or a CSM device.

3. The method for in-situ mixing of homogeneous mortar for geomembrane composite seepage prevention wall according to claim 2, characterized in that, The chainsaw cutting box is equipped with grouting pipes. The slurry in the slurry preparation equipment is injected into the grouting pipes in the chainsaw cutting box through the grouting pump, and then injected into the bottom of the chainsaw cutting box through the grouting pipes.

4. The method for in-situ mixing of homogeneous mortar for geomembrane composite seepage prevention wall according to claim 1, 2, or 3, characterized in that, The mud reverse circulation equipment includes: The traveling vehicle is equipped with suction tubes that extend vertically. Connect the hose to the upper end of the suction pipe and connect it to the mud settling tank. A suction pump is installed on a suction pipe or connecting hose; During the construction of the anti-seepage wall trench, the suction pipe extends into the anti-seepage wall trench, with the lower end of the suction pipe close to the bottom of the anti-seepage wall trench. The mud reverse circulation equipment uses a suction pump, suction pipe and connecting hose to pump the bottom sediment and mud from the bottom of the anti-seepage wall trench into the mud sedimentation tank for sedimentation and filtration.

5. The method for in-situ mixing of homogeneous mortar for geomembrane composite seepage prevention wall according to claim 4, characterized in that, in During the construction of the anti-seepage wall trench, the traveling vehicle moves the suction pipe horizontally along the length of the anti-seepage wall trench to maintain a set distance between the suction pipe and the chainsaw cutting box.

6. The method for in-situ mixing of homogeneous mortar for geomembrane composite seepage prevention wall according to claim 4, characterized in that, The distance between the lower end of the suction pipe and the bottom of the anti-seepage wall trench is 10-50 cm.

7. The method for in-situ mixing of homogeneous mortar for geomembrane composite seepage prevention wall according to claim 1, 2, or 3, characterized in that, The following steps are included before constructing the anti-seepage wall trench. Excavate surface trenches, and mark the center line of the wall with mortar while excavating surface trenches; The embedded box is hoisted and placed. An embedded hole is excavated at the beginning of the surface trench. The embedded box is hoisted into the embedded hole and then backfilled with soil in the gaps around the embedded box. The chainsaw cutting box is hoisted and placed. The chainsaw cutting box consists of several cutting box sections. The cutting box sections are hoisted into the pre-embedded box and connected as a whole. Then the pre-embedded box is hoisted away and the pre-embedded holes are backfilled and compacted. The chainsaw cutting box is inserted into the ground, the trenching machine is in place, then the main unit of the trenching machine is connected to the chainsaw cutting box, and then the cutting box body of the chainsaw cutting box is connected section by section and sunk into the ground until the bottom of the chainsaw cutting box reaches the designed wall bottom elevation.

8. The method for in-situ mixing of homogeneous mortar for geomembrane composite seepage prevention wall according to claim 1, 2, or 3, characterized in that, The counterweight device consists of several units, which are distributed sequentially along the bottom edge of the geomembrane.

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