CN220598517U

CN220598517U - Novel perpendicular flexible prevention of seepage curtain structure

Info

Publication number: CN220598517U
Application number: CN202322198894.7U
Authority: CN
Inventors: 刘更生; 黄超; 杨浩; 蔡成球; 王文燕; 张煜
Original assignee: China City Environment Protection Engineering Ltd
Current assignee: China City Environment Protection Engineering Ltd
Priority date: 2023-08-15
Filing date: 2023-08-15
Publication date: 2024-03-15
Anticipated expiration: 2033-08-15

Abstract

The utility model provides a novel vertical flexible impermeable curtain structure, which comprises an impermeable curtain mounting groove formed by encircling an old landfill, wherein a wall protection slurry layer is arranged on the inner wall of the impermeable curtain mounting groove, a plurality of HDPE geomembranes are arranged in the impermeable curtain mounting groove, each HDPE geomembrane is arranged by encircling the old landfill, the HDPE geomembranes are distributed in sequence in the vertical direction, two adjacent HDPE geomembranes are connected through an interlocking HDPE linking lock, each HDPE geomembrane separates the impermeable curtain mounting groove into a first space and a second space, and the first space and the second space are filled with impermeable layers.

Description

Novel perpendicular flexible prevention of seepage curtain structure

Technical Field

The utility model relates to the field of vertical seepage prevention, in particular to a novel vertical flexible seepage prevention curtain structure.

Background

The problem of imperfect seepage prevention measures of old landfill sites constructed in early stage in China generally exists, and various vertical seepage prevention processes are developed in order to reduce the diffusion of pollutants such as leachate and the like in the landfill sites to the periphery. Common vertical impervious processes include self-setting mortar curtains, cement mixing piles, and the like.

According to the pollution control standard of the household garbage landfill (GB 16889-2008), the permeability coefficient of the impervious wall of the garbage landfill is generally smaller than 1 multiplied by 10 < -7 > cm/s, and the permeability coefficient of the self-setting mortar impervious wall and the cement mixing pile is generally smaller than 1 multiplied by 10 < -6 > cm/s, so that the higher requirement of the garbage landfill on the impervious wall is not met. Aiming at the problem of larger permeability coefficient of the self-setting mortar impervious wall, a new technology is to install an HDPE film in the self-setting mortar impervious wall, thereby improving the impervious performance of the vertical curtain. However, the process has higher requirements on self-setting mortar and higher corresponding construction cost.

In view of the above, it is desirable to design a new vertical flexible impermeable curtain process that overcomes the above-described problems.

Disclosure of Invention

Aiming at the problem of lack of seepage-proofing measures of old landfill sites, the utility model provides a novel vertical flexible seepage-proofing curtain process which is convenient to construct, low in manufacturing cost and good in seepage-proofing effect.

The utility model is realized in the following way:

Further, the novel vertical flexible impermeable curtain structure further comprises two guide walls, the guide walls are arranged around the old landfill site, and the impermeable curtain mounting groove is formed between the two guide walls.

Further, the guide wall is located at the upper end of the impermeable curtain installation groove, and the top of the guide wall is flush with the top of the impermeable curtain installation groove.

Further, the bottom of guide wall is equipped with horizontal wallboard, horizontal wallboard is along keeping away from HDPE geomembrane's direction sets up.

Further, the HDPE geomembrane is welded to the interlocking HDPE interlocking lock.

Further, the novel vertical flexible impermeable curtain structure further comprises a relatively impermeable layer positioned below the old landfill, and the HDPE geomembrane extends into the relatively impermeable layer.

Further, the HDPE geomembrane has a thickness of 3mm.

The utility model has the following beneficial effects:

1. the main seepage-proofing structure of the utility model is an HDPE geomembrane, the permeability coefficient of the HDPE geomembrane can reach more than 10-12cm/s, and the defect of low seepage-proofing performance of cement mixing piles and self-setting mortar curtains can be thoroughly solved.

2. In the vertical direction, the adjacent HDPE geomembranes are connected by adopting the interlocking HDPE chain lock 2, so that the construction is simple and convenient, and the connection effect is good.

3. According to the utility model, the HDPE geomembrane is firstly installed after the impermeable curtain installation groove is dug, so that slurry protection wall is needed in construction of the impermeable curtain installation groove, the stability of the impermeable curtain installation groove is ensured, the filling material between the membrane and the groove wall after the impermeable curtain installation groove is completely installed is a mixture composed of cement, clay, bentonite, water, CMC and sodium carbonate, the preparation is simple, the cost is low, the components are similar to cement mixing piles, but the preparation process of the filling material in the process is more controllable than that of the cement mixing piles, and the strength and the self-defense performance of the filling material are superior to those of the cement mixing piles.

4. In the utility model, the guide wall has the functions of bearing, positioning and the like, and has simple structure and convenient construction.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a diagram showing a large scale of a latch connection according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a novel vertical flexible impermeable curtain structure according to an embodiment of the present utility model.

In the figure: HDPE geomembrane 1, interlocking HDPE chain lock 2, stagnant water adhesive tape 3, adopt double track welding machine welding 4, filler material 5, clay 6, relative impermeable layer 7, guide wall 8, construction flattening elevation 9.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In the description of the utility model, unless otherwise indicated, the meaning of "a number" is two or more.

As shown in fig. 1-2, a first embodiment of the present utility model provides a novel vertical flexible impermeable curtain structure, which includes an impermeable curtain installation groove formed around an old landfill, wherein a wall protection slurry layer is disposed on an inner wall of the impermeable curtain installation groove, the impermeable curtain installation groove is excavated into a relatively impermeable layer 7 below the old landfill, a plurality of HDPE geomembranes 1 are disposed in the impermeable curtain installation groove, each of the HDPE geomembranes 1 is disposed around the old landfill, the thickness of the HDPE geomembranes 1 is 3mm, each of the HDPE geomembranes 1 is sequentially distributed in a vertical direction, two adjacent HDPE geomembranes 1 are connected through an interlocking HDPE linking lock 2, the HDPE geomembranes 1 extend into the relatively impermeable layer 7, each of the HDPE geomembranes separates the impermeable curtain installation groove into a first space and a second space, and the first space and the second space are filled with a HDPE layer, specifically, the inner side (near the impermeable landfill) of the HDPE geomembranes 1 is far away from the impermeable curtain installation groove (the impermeable landfill wall 1); filling materials 5 are adopted for the first impermeable layer and the second impermeable layer, after mud is adopted for the excavated impermeable curtain installation groove, the HDPE geomembrane 1 is installed, and after the HDPE geomembrane 1 is installed, the first impermeable layer on the inner side of the HDPE geomembrane 1 and the second impermeable layer on the outer side of the HDPE geomembrane 1 are filled; the first impermeable layer, the HDPE geomembrane 1 and the second impermeable layer form an impermeable curtain together; according to the utility model, after the impermeable curtain mounting groove is dug, the HDPE geomembrane 1 is firstly installed and then filled, so that the inner wall of the impermeable curtain mounting groove needs to be protected by slurry, the stability of the impermeable curtain mounting groove is ensured, and then the HDPE geomembrane 1 is installed. The HDPE geomembrane 1 extending out of the top of the impermeable curtain installation groove can be connected with a horizontal membrane on the ground.

The novel vertical flexible impermeable curtain structure provided by the utility model is mainly used for vertical impermeable of old refuse landfill. The novel vertical flexible impermeable curtain structure comprises an HDPE geomembrane 1 (HDPE high-density polyethylene) and a filling material 5.

The HDPE geomembrane 1 is a smooth high-density polyethylene geomembrane with the thickness of 3.0 mm. The width of each membrane is 3.5 meters, 4 meters or integer multiples thereof according to factory leaving breadth and considering economic and reasonable factors. The performance index requirement of the HDPE geomembrane 1 meets the relevant requirements of CJ/T234-2006 of high-density polyethylene geomembrane for landfill.

HDPE geomembrane 1 encircles old landfill setting, HDPE geomembrane 1 both sides are clay 6, as in FIG. 1, in vertical direction, adopt interlocking formula HDPE to connect lock 2 to connect between two adjacent HDPE geomembrane 1, HDPE geomembrane 1 and interlocking formula HDPE to connect lock 2 adopt double track welding machine to weld 4 (hot melt welding), adopt socket joint between the hasp of interlocking formula HDPE to connect lock 2, as in FIG. 1, in order to prevent hasp junction seepage, in hasp junction built-in stagnant water adhesive tape 3. The interlocking HDPE coupling lock 2 is an existing product and will not be described in detail here.

The welding seam between the interlocking HDPE connecting lock 2 and the HDPE geomembrane 1 needs to be subjected to destructive detection (mechanical property) and nondestructive detection (air tightness), and the detection method and the standard can be referred to the technical Specification of the anti-seepage system engineering of the sanitary landfill of household garbage (CJJ 113-2007). The water stop adhesive tape 3 meets the requirements of the 3 rd part of the high polymer waterproof material: related requirements of water-swellable rubber (GB/T18173.3-2014).

The filling material 5 is composed of cement, clay, bentonite, water, sodium carboxymethyl cellulose (CMC) and sodium carbonate. Wherein the cement: clay: bentonite=4: 16:1. the preparation method of the filling material comprises the steps of adding water into bentonite, stirring for 5 minutes, adding water into sodium carboxymethylcellulose (CMC) and sodium carbonate, stirring for 5 minutes, mixing the two, stirring for 3 minutes, and swelling for 24 hours for later use. And finally, mixing and stirring the cement, the clay and the swelled bentonite slurry, wherein the slump of the stirred filling material is controlled to be about 160 cm.

The novel vertical flexible impermeable curtain structure further comprises two guide walls 8, the guide walls 8 encircle old refuse landfill sites, impermeable curtain mounting grooves are formed in the two guide walls 8, and the guide walls 8 play roles in bearing, positioning and the like. The guide wall 8 is positioned at the upper end of the impermeable curtain installation groove, and the top of the guide wall 8 is flush with the top of the impermeable curtain installation groove. The bottom of the guide wall 8 is provided with a horizontal wallboard, and the horizontal wallboard is arranged along the direction away from the HDPE geomembrane 1. As shown in fig. 2, the guide wall 8 is L-shaped.

The main seepage-proofing structure of the utility model is HDPE geomembrane 1 with the thickness of 3mm, the permeability coefficient can reach more than 10-12cm/s, and the defect of low seepage-proofing performance of cement mixing piles and self-setting mortar curtains can be thoroughly solved.

On vertical direction, adopt interlocking formula HDPE to link between the geomembrane 1 and lock 2 to connect, hasp junction embeds a plurality of stagnant water adhesive tape 3, each stagnant water adhesive tape 3 is in vertical direction interval setting, and the construction is simple and convenient, connects effectually.

The filling material 5 is a mixture of cement, clay, bentonite, water, CMC and sodium carbonate, has simple configuration and low cost, and has similar components to the cement mixing pile, but the filling material preparation process in the process is more controllable than the cement mixing pile process, and the strength and the defending performance of the filling material are superior to those of the cement mixing pile.

The second embodiment of the utility model provides an implementation method of a novel vertical flexible impermeable curtain structure.

According to the horizontal position of the vertical flexible impermeable curtain, the vertical depth of the vertical flexible impermeable curtain reaches the position (longitudinal direction or vertical direction) of the relative impermeable layer 7, and the vertical flexible impermeable curtain and the relative impermeable layer 7 at the bottom layer jointly realize the barrier to pollutants. The old landfill is located above the relatively impermeable layer 7. The construction of the vertical flexible impermeable curtain mainly comprises the following steps: leveling a construction area, measuring and paying off, constructing a guide wall 8, configuring slurry, digging grooves and forming holes, installing the HDPE geomembrane 1, and backfilling grooves.

The vertical flexible impermeable curtain comprises the following specific steps:

step 1: the vertical flexible impermeable curtain construction area is pushed and pressed by a bulldozer before working, so that uneven subsidence is prevented, traffic and pouring construction are facilitated, and a stepped platform is additionally arranged on backfill soil for places with larger gradients, so that grooving mechanical construction is facilitated.

Step 2: and measuring and paying off the position of the guide wall 8 according to the plane arrangement of the vertical flexible impermeable curtain, wherein the plane position of the guide wall 8 determines the plane position of the vertical impermeable wall.

Step 3: and (3) constructing the guide wall 8 according to the plane position measured in the step (2). The guide wall 8 adopts an underground reinforced concrete structure, and mainly comprises the steps of trench excavation, reinforcement binding, template installation, concrete pouring, template removal, clay backfilling and guide wall maintenance. The guide wall 8 mainly plays a role in guiding and maintaining a certain height of the wall-protecting slurry during grooving of the grooving machine, and also plays an auxiliary role in supporting soil blocking, membrane insertion and the like, and the guide wall construction is needed before mechanical grooving.

Step 4: and (5) configuring wall protection slurry. The wall-protecting slurry material is mainly composed of commercial bentonite of 200 meshes, tap water, sodium carbonate (Na 2CO 3), CMC (high viscosity, powdery), 200 meshes of barite powder and pulp fiber. The main steps are that bentonite is added with water and stirred for 5 minutes, CMC and sodium carbonate are added with water and stirred for 5 minutes, and the bentonite and the sodium carbonate are mixed and stirred, and are swelled for 24 hours for standby.

Step 5: under the action of mud protection wall, grooving is carried out by adopting grooving equipment. Controlling the footage speed according to geological conditions in the drilling process: when the drill is drilled from a hard stratum to a soft stratum, the drilling speed can be properly increased; when the soft stratum is changed into the hard stratum, the slow-going is required to be slowed down; in the stratum easy to shrink, the hole sweeping times are properly increased to prevent the shrinkage; drilling the hard plastic layer at a high rotating speed to improve the drilling rate; and (3) slowly drilling the pebble layer with smaller grain size by adopting a bucket type drill bit, and removing slag by adopting a bucket type drill bit after drilling the pebble layer with larger grain size by adopting a conical spiral drill bit, so as to reciprocate until the pebble layer passes through or is drilled to the depth of a final hole.

Step 6: after the grooving is completed, the HDPE geomembrane 1 is quickly installed. Cutting the membrane mounting design requirement qualified in inspection and welding the membrane mounting design requirement with a lock catch made of HDPE material, mounting the membrane mounting frame to a lower membrane frame after the joint is detected to be qualified, placing the lower membrane frame provided with the membrane into a groove by adopting a crane, interlocking the lock catches on two adjacent membranes in the lower membrane process, and filling a gap by adopting a water stop adhesive tape 3. And taking out the lower film frame after the HDPE geomembrane 1 is lowered to the designated position, and leaving the HDPE geomembrane 1 in the groove.

Step 7: after the film is put down, the film is simply fixed through a steel frame, a filling material 5 is configured to backfill the gap between the film and the groove wall, and slurry in the groove is recycled in the backfilling process. And (5) carrying out next groove section construction after backfilling is completed.

What is not described in detail in this specification is prior art known to those skilled in the art.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A novel vertical flexible impermeable curtain structure is characterized in that: including the prevention of seepage curtain mounting groove of seting up around old landfill, be equipped with the dado mud layer on the inner wall of prevention of seepage curtain mounting groove, be equipped with a plurality of HDPE geomembrane in the prevention of seepage curtain mounting groove, every HDPE geomembrane encircles old landfill setting, each HDPE geomembrane distributes in proper order in the vertical direction, and adjacent two the HDPE geomembrane links to each other through interlocking formula HDPE chain lock, each HDPE geomembrane separates prevention of seepage curtain mounting groove is first space and second space, and in all pack there is the prevention of seepage layer in first space and the second space.

2. The novel vertical flexible impermeable curtain structure of claim 1, wherein: the anti-seepage curtain mounting groove is formed between the two guide walls.

3. The novel vertical flexible impermeable curtain structure of claim 2, wherein: the guide wall is positioned at the upper end of the impermeable curtain installation groove, and the top of the guide wall is flush with the top of the impermeable curtain installation groove.

4. The novel vertical flexible impermeable curtain structure of claim 2, wherein: the bottom of guide wall is equipped with horizontal wallboard, horizontal wallboard is followed keep away from HDPE geomembrane's direction sets up.

5. The novel vertical flexible impermeable curtain structure of claim 1, wherein: the HDPE geomembrane is welded and connected with the interlocking HDPE chain lock.

6. The novel vertical flexible impermeable curtain structure of claim 1, wherein: and the HDPE geomembrane extends into the relatively impermeable layer.

7. The novel vertical flexible impermeable curtain structure of claim 1, wherein: the thickness of the HDPE geomembrane is 3mm.