CN113914375A - Composite impervious wall based on geomembrane and cement soil and construction method - Google Patents
Composite impervious wall based on geomembrane and cement soil and construction method Download PDFInfo
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- CN113914375A CN113914375A CN202111403186.1A CN202111403186A CN113914375A CN 113914375 A CN113914375 A CN 113914375A CN 202111403186 A CN202111403186 A CN 202111403186A CN 113914375 A CN113914375 A CN 113914375A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/004—Sealing liners
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/006—Sealing of existing landfills, e.g. using mining techniques
Abstract
The invention relates to a composite impervious wall based on a geomembrane and cement soil and a construction method, wherein the composite impervious wall comprises a cement soil wall and a vertical impervious membrane wall arranged in the cement soil wall, the vertical impervious membrane wall comprises mutually sleeved amplitude units, and each amplitude unit comprises a frame and a vertical impervious membrane of which the periphery is connected to the inner side of the frame; the construction method comprises the following steps: measuring lofting positioning, groove construction, pile construction and width unit lowering in place. The vertical impermeable membrane is combined with the cement soil wall to form the composite impermeable wall, so that the characteristic of good permeability of the vertical impermeable membrane is fully exerted, the water-soil balance function before the cement soil wall is solidified and the impermeable consolidation function after the cement soil wall is solidified are simultaneously exerted, the width and the path of the whole impermeable effect are increased, and the single impermeable effect is improved. The positioning centering frame is adopted to carry out positioning construction in the lowering process, and the positioning centering frame mainly ensures the control of the verticality of the lowering process of the amplitude unit and limits the influence of the lowering process of the amplitude unit on the finished amplitude unit.
Description
Technical Field
The invention relates to the technical field of anti-seepage treatment, in particular to a composite anti-seepage wall based on a geomembrane and cement soil and a construction method.
Background
In the environmental protection engineering field, in particular to the pollution places such as the former chemical plant relocation leaving-over place or refuse landfill, the underground soil body and water suffer pollution diffusion, like the seepage of domestic waste field filtration liquid, the pollution diffusion of chemical industry heavy metal etc. has caused very big influence to people's healthy and living environment.
The elimination of the pollution source needs to be comprehensively considered and removed or controlled, but the prevention of the outward expansion of the pollution source before treatment is a very important means, because the influence range of soil and underground water is larger and larger along with the increase of the years and months, and the cost of the post-treatment is larger and larger if no measures are taken to limit the outward expansion of the pollution source. And threatens human life and existence all the time, so the control of the pollution source is particularly important, and the vertical impermeable barrier wall technology is gradually applied to the control and treatment of the pollution source by the advantages of small occupied area, quick effect and corrosion resistance. The conventional vertical impermeable separation wall comprises a cement-soil impermeable separation wall and a HDPE film impermeable separation wallOf the type in which the impervious efficiency of the cement impervious wall is often less than 10-7Magnitude, affecting its effectiveness and scope of use. The vertical anti-seepage separation wall of the HDPE film is vertically grooved, then the HDPE film is vertically installed in the groove body, the flow of underground polluted water bodies is blocked, the diffusion of polluted underground water is prevented, the closed control of a pollution source is achieved, the HDPE film is installed completely, the HDPE film is required to be connected through interlocking between the lock catches, but cavity gaps exist between the lock catches, liquid leakage is easily caused, the treatment effect is influenced, and therefore improvement of the structure and the process is urgently needed.
Based on the consideration, the HDPE film has good permeability resistance and can meet the permeability resistance requirement, but the permeability resistance effect of the permeability resistance barrier wall is poor due to the reasons that the HPDE film is not placed in place or the slotted hole collapses, the HDPE film joint is not well treated and the like easily occur in the process of forming the vertical permeability resistance wall.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the composite impervious wall based on the geomembrane and the cement soil and the construction method are provided.
The technical scheme adopted by the invention is as follows: the utility model provides a compound impervious wall based on geomembrane and cement soil, includes the cement soil wall and locates the perpendicular impervious membrane wall in the cement soil wall, perpendicular impervious membrane wall including the width of cloth unit that cup joints each other, the width of cloth unit include the frame and connect all around in the inboard perpendicular impervious membrane of frame, the frame including set up respectively in the last horizontal pole and the sheer pole of upper and lower both ends, locate the left and right sides respectively big joint and the small joint, perpendicular impervious membrane about both sides be equipped with and be fixed in the inboard wire net around the frame, the sheer pole on perpendicular intercommunication have the gas-supply pipe of locating perpendicular impervious membrane top.
The width of each width unit is not less than 3m, and the width units are mutually sleeved through a large joint and a small joint. The frame is used for ensuring the flatness of the vertical impermeable membrane and preventing the impermeable membrane from deviating or being damaged due to uneven stress on two sides in the downward transferring process of the vertical impermeable membrane. The vertical impermeable membrane is composed of a geomembrane, geotextile, geogrid, a geotechnical blanket and the like with a certain impermeable effect, and the connection mode of the vertical impermeable membrane comprises two modes of lap joint and welding and mainly comprises welding. The two sides of the vertical impermeable membrane are provided with 8-10 meshes of steel wire meshes, so that the vertical impermeable membrane is prevented from deforming and breaking in the process of lowering.
Furthermore, the large joints and the small joints on the left side and the right side of the frame are fixed through the inclined rods with the end parts fixed in the large joints or the small joints, so that the deformation resistance of the frame is improved.
Furthermore, the inclined rod is arranged above the vertical impermeable membrane and is arranged in a transverse W shape.
Furthermore, the large joint and the small joint are mutually matched and sleeved, the cross section of the large joint is of an arc-shaped structure, and the cross section of the small joint is of a circular structure sleeved in the arc-shaped structure of the large joint.
Furthermore, the lower part of the lower cross rod is provided with an exhaust hole. The gas pipe is supplied by external gas supply equipment, and the gas in the gas pipe is discharged through the exhaust holes below the lower cross rod and is aerated in the cement wall, so that the resistance of cement slurry to the amplitude unit in the lowering process is reduced.
A construction method of a composite impervious wall comprises the following steps:
A. after the positioning and measuring lofting position is located, groove construction is carried out;
B. during construction, a cement-soil pile machine is erected firstly, a first cement-soil mixing pile is positioned, and composite impermeable soil slurry required by a cement-soil wall is prepared;
C. stirring, guniting and sinking at the positioning position of the first pile by adopting a cement soil stirring pile, and then stirring, lifting and guniting to prepare a test block;
D. after the construction of the first pile is finished, shifting a cement soil pile machine, and constructing the next pile in sequence according to the steps B and C until the construction of the cement soil mixing pile is finished;
E. after the construction of the cement soil mixing pile is completed, a frame is manufactured, and after the vertical impermeable membrane is detected, the vertical impermeable membrane is welded on the frame to obtain a width unit;
F. after the positioning centering frame is placed, the first surface breadth unit is placed downwards, and when the breadth unit is placed downwards, air is supplied to the air conveying pipe through external air supply equipment;
G. and D, after the first surface amplitude unit is placed, positioning and centering the frame to move, and sequentially placing down one surface amplitude unit according to the step F until the complete vertical impermeable membrane wall is obtained.
After the amplitude unit is placed, the top positions of the placed amplitude unit and the top limiting plate are considered to be flush, so that the jack is started to ascend before the positioning centering frame is completely translated, the ascending part distance of the top limiting plate is enabled to be higher than the position of the amplitude unit which is just placed, and the power device is started to enable the whole frame body to move to the next amplitude unit position along the bottom guide rail.
Further, the positioning centering frame in the step F comprises a base, a bottom limiting plate, a guide rail, a jack, a supporting rod and a top limiting plate, wherein the base is symmetrically arranged at the bottoms of the two sides, the bottom limiting plate is fixed on the inner side of the base, the guide rail is arranged on the base, the jack is located in the guide rail, the supporting rod is arranged on the jack, and the top limiting plate is arranged on the supporting rod.
Because the width of cloth unit formula frame as an organic whole, holistic rigidity is limited, leads to transferring the final prevention of seepage effect of influence such as the in-process deformation, straightness offset that hangs down easily appearing, so transfer the in-process and adopt the location centering frame to carry out the location construction, the location centering frame mainly ensures the control of the in-process straightness that hangs down of width of cloth unit and the restriction width of cloth unit transfers the in-process to accomplishing the influence of width of cloth unit.
Furthermore, the top limiting plate is provided with a diagonal draw bar, one end of the diagonal draw bar is fixed on the top limiting plate, and the other end of the diagonal draw bar is fixed on the spoke unit. The two sides of the middle of the top limiting plate, which are close to the large joint of the finished amplitude unit, are provided with the diagonal draw bars, the top limiting plate and the finished amplitude unit are fixed through the diagonal draw bars, and the amplitude unit which is placed later is prevented from being lowered in the process of lowering to drive the finished amplitude unit to sink.
Furthermore, two symmetrical bottom limiting plates are adopted, and a space for the amplitude lowering unit is reserved between the two bottom limiting plates; the middle of the top limiting plate is provided with a through hole for placing the spoke unit. The opening positions and sizes of the top limiting plate and the bottom limiting plate are consistent, only the lower width unit is placed, and the verticality of the width unit is controlled through the opening position in the middle of the top and bottom limiting plates. The vertical distance between the top and bottom limit plates is the sum of the length of the support rod and the height of the jack. The width of the middle through hole of the top limit plate is +2cm of the maximum width of the spoke unit.
Further, in the step B, the composite impermeable cement-soil slurry is prepared from dry powder and water, wherein the dry powder comprises the following raw materials in percentage by mass: 5-25% of cement, 65-85% of bentonite, 1-3% of silicon phosphate, 0.2-1.0% of nano zinc oxide, 0.1-0.5% of aluminum hydroxide, 0.05-0.20% of polycarboxylic acid water reducing agent and 3-6% of gypsum, wherein the mass of the water is 35% of that of the dry powder.
The cement-soil wall can be initially set within 1 hour after the cement-soil wall is formed, the cement-soil wall is solidified within 6 hours, the vertical impermeable membrane is difficult to be placed after exceeding the initial setting time, and the cement-soil wall can not be placed after exceeding 6 hours, so that the slurry ratio is strictly controlled in the cement-soil wall construction process, and the specially-made composite impermeable cement-soil slurry is adopted, so that the cement-soil wall can be initially set within 24 hours after the cement-soil wall construction is completed, and the vertical impermeable membrane is convenient to be placed. In the dry powder, the cement is 425 ordinary portland cement, which plays roles in cementing and increasing strength; the fineness of the bentonite is below 200 meshes, so that the dense and anti-seepage effects are achieved; the silicon phosphate is a curing agent and a water-retaining agent of cement, and plays roles in preventing water, seepage and enhancing; the diameter of the nano zinc oxide is less than 50 nanometers, and the nano zinc oxide plays roles in moisturizing and retarding coagulation; the aluminum hydroxide with the grain diameter of 100 meshes or less is used as a suspended thixotropic agent to prevent slurry from settling, separating and bleeding; the polycarboxylic acid water reducing agent has the functions of reducing water, compacting and enhancing; the gypsum is dihydrate gypsum, and has the effects of retarding coagulation, expanding and compacting. The composite impermeable cement slurry can form water and soil balance between the grooves to prevent hole collapse, and can form a suspension state and delay the setting time of the cement without influencing the strength of the cement so that the vertical impermeable film can be smoothly put down.
Compared with the prior art, the invention has the following advantages: the vertical impermeable membrane is combined with the cement soil wall to form the composite impermeable wall, so that the characteristic of good permeability of the vertical impermeable membrane is fully exerted, the water-soil balance function before the cement soil wall is solidified and the impermeable consolidation function after the cement soil wall is solidified are simultaneously exerted, the width and the path of the whole impermeable effect are increased, and the single impermeable effect is improved. The positioning centering frame is adopted to carry out positioning construction in the lowering process, and the positioning centering frame mainly ensures the control of the verticality of the lowering process of the amplitude unit and limits the influence of the lowering process of the amplitude unit on the finished amplitude unit.
Drawings
FIG. 1 is a schematic structural view of the composite impermeable barrier wall of the present invention;
FIG. 2 is a schematic structural view of the frame of the present invention;
FIG. 3 is a schematic view of the structure at the vertical barrier membrane of the present invention;
FIG. 4 is a schematic view of the structure at the joint of the present invention;
FIG. 5 is a schematic view of the alignment frame of the present invention;
FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5 in accordance with the present invention;
FIG. 7 is a cross-sectional view taken along line B-B of FIG. 5 in accordance with the present invention;
fig. 8 is a cross-sectional view taken along line C-C of fig. 5 in accordance with the present invention.
Reference numbers in the figures: the anti-seepage concrete wall comprises 1-a cement soil wall, 2-a vertical anti-seepage film wall, 3-a unit, 4-a frame, 5-a vertical anti-seepage film, 6-a base, 7-a bottom limiting plate, 8-a top limiting plate, 9-a jack, 10-a supporting rod, 11-a diagonal draw bar, 12-a guide rail, 13-a positioning centering frame, 41-an upper cross bar, 42-a lower cross bar, 43-a large joint, 44-a small joint, 45-a steel wire mesh, 46-a diagonal draw bar and 47-a gas pipe.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the embodiments of the present invention, but the scope of the present invention is not limited to the following examples.
Fig. 1-4 show a compound cut-off wall based on geomembrane and soil cement, include soil cement wall 1 and locate the perpendicular cut-off wall 2 in the soil cement wall 1, perpendicular cut-off wall 2 including the width of cloth unit 3 that cup joints each other, width of cloth unit 3 include frame 4 and connect all around in the inboard perpendicular prevention of seepage membrane 5 of frame 4, frame 4 including set up respectively in the last horizontal pole 41 and the sheer pole 42 at upper and lower both ends, locate the main joint 43 and the small joint 44 of the left and right sides respectively, perpendicular prevention of seepage membrane 5 upper and lower both sides be equipped with and be fixed in the inboard wire net 45 all around of frame 4, sheer pole 42 on the gas-supply pipe 47 of locating perpendicular prevention of seepage membrane 5 top of perpendicular intercommunication.
The width of each width unit 3 is not less than 3m, and the width units 3 are mutually sleeved through a large joint 43 and a small joint 44. The frame 4 is used for ensuring the flatness of the vertical impermeable membrane 5 and preventing the impermeable membrane from deviating or being damaged due to uneven stress on two sides in the downward placing process of the vertical impermeable membrane 5. The vertical impermeable membrane 5 is composed of geomembrane, geotextile, geogrid, geotextile and the like with a certain impermeable effect, and the connection mode of the membrane comprises two modes of lap joint and welding and mainly comprises welding. The two sides of the vertical impermeable membrane 5 are provided with steel wire meshes 45 with 8-10 meshes, so that the vertical impermeable membrane 5 is prevented from deforming and breaking in the lowering process.
The large joint 43 and the small joint 44 on both left and right sides of the frame 4 are fixed by a diagonal rod 46 whose end is fixed in the large joint 43 or the small joint 44.
The inclined rod 46 is arranged above the vertical impermeable membrane 5 and is arranged in a transverse W shape.
The large joint 43 and the small joint 44 are mutually matched and sleeved, the cross section of the large joint 43 is of an arc-shaped structure, and the cross section of the small joint 44 is of a circular structure sleeved in the arc-shaped structure of the large joint 43.
The lower part of the lower cross bar 42 is provided with an exhaust hole. The air pipe 47 is supplied by external air supply equipment (not shown in the figure), and air in the air pipe 47 is discharged through the air vent below the lower cross rod 42 and is aerated in the cement wall 1, so that the resistance of cement slurry to the spoke unit 3 in the lowering process is reduced.
A construction method of a composite impervious wall comprises the following steps:
A. after the positioning and measuring lofting position is located, groove construction is carried out;
B. during construction, a cement-soil pile machine is erected firstly, a first cement-soil mixing pile is positioned, and composite impermeable soil slurry required by the cement-soil wall 1 is prepared;
C. stirring, guniting and sinking at the positioning position of the first pile by adopting a cement soil stirring pile, and then stirring, lifting and guniting to prepare a test block;
D. after the construction of the first pile is finished, shifting a cement soil pile machine, and constructing the next pile in sequence according to the steps B and C until the construction of the cement soil mixing pile is finished;
E. after the construction of the cement soil mixing pile is completed, a frame 4 is manufactured, and after a vertical impermeable membrane 5 is detected, the vertical impermeable membrane is welded on the frame 4 to obtain a width unit 3;
F. after the positioning centering frame 13 is placed, the first surface width unit 3 is placed downwards, and when the width unit 3 is placed downwards, the air pipe 47 is supplied with air through external air supply equipment;
G. and D, after the first surface frame unit 3 is completely placed, carrying out positioning and centering frame 13 displacement, and sequentially placing the next surface frame unit 3 according to the step F until the complete vertical impermeable membrane wall 2 is obtained.
After the amplitude unit 3 is completely transferred, the amplitude unit 3 which is transferred is considered to be flush with the top position of the top limiting plate 8, so that before the positioning centering frame 13 is completely transferred, the jack 9 is started to perform ascending operation, the ascending part distance of the top limiting plate 8 is higher than the position of the amplitude unit 3 which is just transferred, and the power device is started to enable the whole frame body to move to the position of the next amplitude unit 3 along the bottom guide rail 12.
Because the width of cloth unit 3 is the integral type frame, holistic rigidity is limited, leads to transferring the final prevention of seepage effect of influence such as the in-process deformation, straightness offset that hangs down easily appearing, so adopt location centering frame 13 to carry out the location construction in transferring the in-process, location centering frame 13 mainly ensures the control of width of cloth unit 3 transfer in-process verticality and restriction width of cloth unit 3 transfers the in-process to accomplishing the influence of width of cloth unit 3.
As shown in fig. 5 to 8, the positioning centering frame 13 in step F includes bases 6 symmetrically disposed at the bottoms of the two sides, bottom limiting plates 7 fixed inside the bases 6, guide rails 12 disposed on the bases 6, jacks 9 located in the guide rails 12, support rods 10 disposed on the jacks 9, and top limiting plates 8 disposed on the support rods 10.
The top limiting plate 8 is provided with a diagonal draw bar 11, one end of the diagonal draw bar 11 is fixed on the top limiting plate 8, and the other end is fixed on the spoke unit 3. Set up oblique pull rod 11 near 3 major joint department both sides of completion width of cloth unit in the middle of top limiting plate 8, will push up limiting plate 8 and fix with the width of cloth unit 3 that has accomplished through oblique pull rod 11, prevent that the width of cloth unit 3 that later transfers from transferring the in-process and driving the width of cloth unit 3 that has accomplished and sinking.
The two bottom limiting plates 7 are symmetrical, and a space for the width lowering unit 3 is reserved between the two bottom limiting plates 7; and a through hole for lowering the width unit 3 is arranged in the middle of the top limit plate 8. The opening positions and sizes of the top limit plate 8 and the bottom limit plate 7 are consistent, only the lower width unit 3 is placed, and the verticality of the lower width unit 3 is controlled through the opening position in the middle of the top limit plate and the bottom limit plate. The vertical distance between the top and bottom limit plates is the sum of the length of the support rod 10 and the height of the jack 9. The width of the through hole in the middle of the top limit plate 8 is +2cm of the maximum width of the width unit 3.
In the step B, the composite impermeable cement-soil slurry is prepared from dry powder and water, wherein the dry powder comprises the following raw materials in percentage by mass: 5-25% of cement, 65-85% of bentonite, 1-3% of silicon phosphate, 0.2-1.0% of nano zinc oxide, 0.1-0.5% of aluminum hydroxide, 0.05-0.20% of polycarboxylic acid water reducing agent and 3-6% of gypsum, wherein the mass of the water is 35% of that of the dry powder.
The cement soil wall 1 can have an initial setting phenomenon in one hour after the cement soil wall is formed, solidification occurs in six hours, the vertical impermeable membrane 5 is difficult to place and cannot be placed in more than six hours after the initial setting time is exceeded, so that the slurry ratio is strictly controlled in the process of constructing the cement soil wall 1, the specially-made composite impermeable cement soil slurry is adopted, the cement soil wall can be initially set in twenty-four hours after the construction of the cement soil wall 1 is completed, and the vertical impermeable membrane 5 is convenient to place. In the dry powder, the cement is 425 ordinary portland cement, which plays roles in cementing and increasing strength; the fineness of the bentonite is below 200 meshes, so that the dense and anti-seepage effects are achieved; the silicon phosphate is a curing agent and a water-retaining agent of cement, and plays roles in preventing water, seepage and enhancing; the diameter of the nano zinc oxide is less than 50 nanometers, and the nano zinc oxide plays roles in moisturizing and retarding coagulation; the aluminum hydroxide with the grain diameter of 100 meshes or less is used as a suspended thixotropic agent to prevent slurry from settling, separating and bleeding; the polycarboxylic acid water reducing agent has the functions of reducing water, compacting and enhancing; the gypsum is dihydrate gypsum, and has the effects of retarding coagulation, expanding and compacting. The composite impermeable cement slurry can form water and soil balance between the grooves to prevent hole collapse, and can form a suspension state and delay the setting time of the cement without influencing the strength of the cement so that the vertical impermeable film can be smoothly put down.
Claims (10)
1. The utility model provides a compound cut-off wall based on geomembrane and soil cement which characterized in that: including cement soil wall (1) and locate perpendicular prevention of seepage membrane wall (2) in cement soil wall (1), perpendicular prevention of seepage membrane wall (2) including the width of cloth unit (3) that cup joints each other, width of cloth unit (3) including frame (4) and connect all around in frame (4) inboard perpendicular prevention of seepage membrane (5), frame (4) including set up respectively in last horizontal pole (41) and sheer pole (42) at upper and lower both ends, locate left and right sides's main joint (43) and small joint (44) respectively, perpendicular prevention of seepage membrane (5) upper and lower both sides be equipped with and be fixed in frame (4) inboard wire net (45) all around, sheer pole (42) on perpendicular intercommunication have gas-supply pipe (47) of locating perpendicular prevention of seepage membrane (5) top.
2. The geomembrane and soil cement based composite cutoff wall according to claim 1, characterized in that: the large joints (43) and the small joints (44) on the left side and the right side of the frame (4) are fixed through inclined rods (46) with end parts fixed in the large joints (43) or the small joints (44).
3. The geomembrane and soil cement based composite cutoff wall according to claim 2, characterized in that: the inclined rod (46) is arranged above the vertical impermeable membrane (5) and is arranged in a transverse W shape.
4. The geomembrane and soil cement based composite cutoff wall according to claim 1, characterized in that: the large joint (43) and the small joint (44) are mutually matched and sleeved, the cross section of the large joint (43) is of an arc-shaped structure, and the cross section of the small joint (44) is of a circular structure sleeved in the arc-shaped structure of the large joint (43).
5. The geomembrane and soil cement based composite cutoff wall according to claim 1, characterized in that: the lower part of the lower cross rod (42) is provided with an exhaust hole.
6. The construction method of the composite cutoff wall as set forth in any one of claims 1 to 5, wherein: the method comprises the following steps:
A. after the positioning and measuring lofting position is located, groove construction is carried out;
B. during construction, a cement-soil pile machine is erected firstly, a first cement-soil mixing pile is positioned, and composite impermeable soil slurry required by a cement-soil wall (1) is prepared;
C. stirring, guniting and sinking at the positioning position of the first pile by adopting a cement soil stirring pile, and then stirring, lifting and guniting to prepare a test block;
D. after the construction of the first pile is finished, shifting a cement soil pile machine, and constructing the next pile in sequence according to the steps B and C until the construction of the cement soil mixing pile is finished;
E. after the construction of the cement soil mixing pile is completed, a frame (4) is manufactured, and after the vertical impermeable membrane (5) is detected, the vertical impermeable membrane is welded on the frame (4) to obtain a width unit (3);
F. after the positioning centering frame (13) is placed, the first surface width unit (3) is placed downwards, and when the width unit (3) is placed downwards, air is supplied to the air conveying pipe (47) through external air supply equipment;
G. and D, after the first breadth unit (3) is placed down, carrying out positioning centering frame (13) displacement, and sequentially placing down one breadth unit (3) according to the step F until the complete vertical impervious film wall (2) is obtained.
7. The construction method according to claim 6, wherein: and step F, the positioning centering frame (13) comprises bases (6) symmetrically arranged at the bottoms of the two sides, a bottom limiting plate (7) fixed on the inner side of the base (6), guide rails (12) arranged on the bases (6), jacks (9) located in the guide rails (12), supporting rods (10) arranged on the jacks (9), and top limiting plates (8) arranged on the supporting rods (10).
8. The construction method according to claim 7, wherein: the top limiting plate (8) under be equipped with oblique pull rod (11), oblique pull rod (11) one end be fixed in top limiting plate (8), the other end is fixed in width of cloth unit (3).
9. The construction method according to claim 7, wherein: the two bottom limiting plates (7) are symmetrical, and a space for the width lowering unit (3) is reserved between the two bottom limiting plates (7); the middle of the top limit plate (8) is provided with a through hole for lowering the width unit (3).
10. The construction method according to claim 6, wherein: in the step B, the composite impermeable cement-soil slurry is prepared from dry powder and water, wherein the dry powder comprises the following raw materials in percentage by mass: 5-25% of cement, 65-85% of bentonite, 1-3% of silicon phosphate, 0.2-1.0% of nano zinc oxide, 0.1-0.5% of aluminum hydroxide, 0.05-0.20% of polycarboxylic acid water reducing agent and 3-6% of gypsum, wherein the mass of the water is 35% of that of the dry powder.
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