CN111350180A - Regenerated micro-powder improved soil-bentonite vertical antifouling partition wall and construction method thereof - Google Patents
Regenerated micro-powder improved soil-bentonite vertical antifouling partition wall and construction method thereof Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/20—Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
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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
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0037—Clays
- E02D2300/004—Bentonite or bentonite-like
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0037—Clays
- E02D2300/004—Bentonite or bentonite-like
- E02D2300/0043—Bentonite or bentonite-like with other ingredients
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Abstract
The invention discloses a reclaimed micro powder improved soil-bentonite vertical antifouling isolation wall and a construction method thereof. The method comprises the following steps: a. preparing bentonite slurry; b. preparing construction waste regenerated micro powder; c. constructing a guide wall; d. digging soil to form a groove; e. preparing a wall material of the partition wall; f. manufacturing a bottom supporting plate and an inner inserting plate; g. manufacturing a steel pipe frame; h. welding a bottom support plate; i. welding the inner inserting plate; j. hoisting the steel pipe frame; k. the anti-seepage plates are connected in a hot melting way; i, backfilling wall materials of the partition wall; and m, forming the vertical antifouling partition wall. The invention can enhance the stability of the groove during the construction of the vertical antifouling separation wall, also ensure the integrity of the wall body after the wall is formed, enhance the seepage-proofing and antifouling properties of the vertical antifouling separation wall, and simultaneously optimize the mechanical properties and the seepage-proofing and antifouling properties of the wall body by using the recycled micro powder of the construction wastes as a wall body improving material.
Description
Technical Field
The invention belongs to the technical field of urban underground water and soil pollution prevention and control, and particularly relates to a reclaimed micro-powder modified soil-bentonite vertical antifouling partition wall and a construction method thereof.
Background
Cities are intensive areas of industrial production and living, and the urbanization process of China continues to keep the trend of rapid development in recent years, but the construction and operation management levels of the industrial and municipal environment-friendly infrastructures in China are still relatively lagged, and the pollution prevention and control level of the centralized waste treatment places in cities is low, so that the problem of underground water and soil pollution in cities in China is increasingly serious. The urban underground water and soil pollution has the characteristics of concealment, accumulation, irreversibility and the like, is high in treatment difficulty, high in cost and long in period, and has long-term influence on human health and economic and social development.
The vertical antifouling isolation wall is the most widely and basic underground water and soil pollution prevention and control technology at present, and in recent years, China gradually adopts the vertical isolation wall technology to control underground water and soil pollution sources. The isolation wall is made of plastic concrete, soil-bentonite and the like. Wherein, the plastic concrete vertical antifouling partition wall often finds the situation that the permeability does not reach the standard in engineering practice; the vertical soil-bentonite antifouling partition wall has low permeability and good chemical compatibility, but has low wall strength and high compressibility. Therefore, further intensive research needs to be carried out on the method for improving the wall material of the partition wall, so that the vertical antifouling partition wall has good seepage-proofing property, good blocking property and good durability, and fully plays a role in controlling the diffusion of pollutants in underground water and soil.
China specially does 2017.10.31 disclose an invention patent named cement-bentonite vertical antifouling partition wall structure and method (application number: CN201711047288.8), the structure comprises a cement-bentonite wall body and material proportion thereof, and guide walls arranged at two sides of the earth surface part of the cement-bentonite wall body, the cement-bentonite wall body penetrates into a relatively impervious soil layer from the earth surface through a high-permeability rock-soil layer, and a stable upstream water level and a stable downstream water level are formed on the high-permeability rock-soil layer; the cement-bentonite wall body, the top surface of the guide wall and the surrounding ground are covered with structures. The vertical antifouling partition wall structure has the following technical effects: the wall material has the advantages of high water content, low permeability, strong anti-deformation capability, higher shear strength and the like, and the one-step construction method for directly forming the wall material by adopting the cement-bentonite slurry for excavating the groove retaining wall through hydration and hardening has the advantages of simple method, small operation surface and simplified construction process of the vertical antifouling separation wall; the prepared separation wall is used for controlling the underground water seepage of a centralized pollution source and preventing and controlling the diffusion of pollutants, and is particularly suitable for working conditions with high overlying pressure or lateral pressure of a foundation.
The construction process of the bentonite vertical antifouling isolation wall generally comprises three processes of trench excavation, wall material backfilling and wall material consolidation. The grooving machine excavates a groove in a field according to a design width, bentonite slurry needs to be poured into the groove to protect the wall so as to ensure the stability of the groove, then wall materials are backfilled into the groove to replace the slurry to initially form a wall, and the wall materials reach target permeability through a consolidation process. However, in the construction process of the vertical antifouling partition wall, the stability of the wall of the tank is not easy to guarantee, and the formed soil-bentonite vertical antifouling partition wall may partially sandwich soil, resulting in large local permeability and poor antifouling performance of the vertical antifouling partition wall.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a reclaimed micro powder improved soil-bentonite vertical antifouling separation wall and a construction method thereof. The steel pipe frame of the vertical antifouling separation wall can play a certain restraint role on the wall material of the separation wall, the bearing capacity of the vertical antifouling separation wall is increased to a certain extent, the impact on the bottom of the groove when the wall material of the separation wall is backfilled can be reduced, the stability of the groove is favorably kept, and the anti-seepage and antifouling performances of a target can be achieved after the vertical antifouling separation wall is formed into a wall. In the construction method, the construction waste regenerated micro powder is used as a wall improvement material, so that the vertical antifouling partition wall has better anti-seepage and antifouling performances, thereby realizing the resource recycling of the construction waste and reducing the secondary pollution of the construction waste regenerated micro powder to the environment; the geogrids are laid on two sides of the groove wall, so that the groove wall can be effectively prevented from collapsing in the process of bentonite slurry wall protection, the stability of the groove is ensured, the integrity of the vertical antifouling separation wall body after wall forming is also ensured, and the seepage-proofing and antifouling performances of the vertical antifouling separation wall are further ensured; the bottom supporting plates are arranged in the steel pipe frame and used for integrally welding the inner inserting plates, sufficient space is reserved between every two adjacent bottom supporting plates, flowing and backfilling of the wall material of the partition wall with large slump is facilitated, the inner inserting plates are installed on the bottom supporting plates, the bottoms of the anti-seepage plates inserted into the wall material of the partition wall are limited in the inner inserting plates, the situation that the anti-seepage plates deviate from the installation position when the wall material of the partition wall with large slump flows is avoided, the anti-seepage plates are arranged in the wall body of the partition wall, and the anti-seepage plates and the soil-bentonite vertical anti-fouling partition wall are combined into a composite vertical anti-fouling partition system, so that the anti-seepage and anti-fouling performance of the partition wall can be improved, and the service life of the vertical anti-.
In order to solve the technical problems, the invention adopts the following technical scheme:
the vertical antifouling division wall of regeneration miropowder modified soil-bentonite, including the division wall body and set up the wall of leading in division wall body earth's surface part both sides, its characterized in that: the steel pipe frame is arranged at the bottom of the wall body of the isolation wall.
This vertical antifouling division wall is under construction through hanging the steel-pipe frame in the slot, the steel-pipe frame sets up the bottom at the division wall body, the steel-pipe frame can play certain constraint effect to division wall body material, the bearing capacity of vertical antifouling division wall has been increased to a certain extent, and can reduce the impact to the slot bottom when division wall body material backfills, be favorable to keeping the slot stability, and then can reach the prevention of seepage of target, antifouling performance after guaranteeing vertical antifouling division wall to become the wall.
Furthermore, the wall body of the isolation wall is a structure formed by mixing recycled building waste micro powder, bentonite and in-situ foundation soil. With the continuous acceleration of the urbanization process in China, a series of capital construction projects continuously generate a large amount of construction wastes, and materials such as waste concrete, waste mortar, brick and tile fragments and the like in the construction wastes can be processed into regenerated coarse and fine aggregates with a certain particle size through the working procedures of crushing, screening, impurity removal and the like. In the process of preparing the recycled aggregate from the construction waste, a large amount of recycled micro-powder materials with the particle size of less than 0.075mm is inevitably generated at the same time, and accounts for about 15-20% of the total mass of the construction waste. The regenerated micro powder has fine particles and low activity, has the function of an inert mineral admixture, can effectively fill the pores of a wall material when being mixed into the wall material, improves the strength of the wall, optimizes the mechanical property and the anti-seepage property of the wall, and reduces the deformation of the wall in the use process. The regenerated micro powder is loose and porous powder, has a large specific surface area and good pollutant adsorption capacity, and can effectively improve the antifouling performance of the vertical partition wall. But also can realize the resource recycling of the construction waste and reduce the secondary pollution of the recycled micro powder of the construction waste to the environment.
And the geogrid is fixedly connected with the steel pipe frame and the guide wall, and the geogrid is arranged on two sides of the partition wall body. The geogrid can effectively prevent the wall of the groove from collapsing in the process of bentonite slurry wall protection, ensures the stability of the groove, also ensures the integrity of the vertical antifouling separation wall body after wall formation, and further ensures the anti-seepage and antifouling performances of the vertical antifouling separation wall.
Further, the anti-seepage plate is inserted in the center of the upper part of the partition wall body. The anti-seepage plate is arranged in the wall body of the partition wall, so that the anti-seepage plate and the soil-bentonite vertical antifouling partition wall are combined into a composite vertical antifouling partition system, the anti-seepage and antifouling performances of the partition wall can be improved, and the service life of the vertical antifouling partition wall can be prolonged.
Furthermore, a bottom support plate is welded at the top of the single steel pipe frame, an inner inserting plate is welded between the bottom support plates, a clamping groove is formed in the bottom support plates, the bottom end of the inner inserting plate is matched and welded in the clamping groove, a groove is formed in the center of the inner inserting plate, the width of the groove is slightly larger than the thickness of the anti-seepage plate, and the bottom end of the anti-seepage plate is inserted into the groove. Through set up the bottom sprag board in the steel-pipe frame for wholly weld the interior picture peg, and reserve sufficient space between two adjacent bottom sprag boards, the great barrier wall material of slump flows the backfill of being convenient for, through install the interior picture peg in the bottom sprag board for the bottom of the prevention of seepage board that inserts in barrier wall material is spacing including in the picture peg, causes the skew mounted position of prevention of seepage board when avoiding the great barrier wall material of slump to flow.
Furthermore, the lifting lugs are welded at the top of the bottom supporting plate, so that the steel pipe frame can be conveniently and integrally lifted, the steel pipe frame can be manufactured on the ground, and the manufacturing space of the steel pipe frame is increased.
Further, the bottom of draw-in groove and interior picture peg all is trapezoidal form for the draw-in groove is big end down's shape, and when the picture peg was inserted in the welding, the interior picture peg can only be along bottom sprag board's draw-in groove length direction horizontal migration, can not reciprocate like this, makes interior picture peg bottom can laminate the welding completely with bottom sprag board, reduces the welding degree of difficulty, improves welding quality.
Furthermore, the steel pipe frame includes vertical steel pipe and horizontal steel pipe, and the welding of horizontal steel pipe is between two adjacent parallel arrangement's vertical steel pipe for whole steel pipe frame has stronger anti deformability. The welding has the connecting steel pipe between the vertical steel pipe of two adjacent steel-pipe racks for a plurality of steel-pipe racks connect into a whole, are convenient for hang and put the steel-pipe rack, reserve certain space between two adjacent steel-pipe racks moreover, make and reserve sufficient space between two adjacent bottom sprag boards, the great division wall body material of slump of being convenient for flows and backfills.
The construction method of the regenerated micro-powder improved soil-bentonite vertical antifouling partition wall is characterized by comprising the following steps:
a. preparing bentonite slurry:
the bentonite slurry is mainly used for slurry retaining walls after the grooves of the partition walls and is used as a component of the wall material of the partition walls. The bentonite slurry is left to stand for 24 hours after being fully stirred to ensure that the bentonite is fully hydrated. The main control indicators of the bentonite slurry quality are as follows: the specific gravity is 1.1-1.3, the viscosity is 18-25 s, the sand content is less than or equal to 5%, the colloid content is 95%, and the like.
b. Preparing construction waste regenerated micro powder:
the method comprises the steps of firstly carrying out overall primary crushing on waste concrete from big to small, crushing large waste concrete into small test blocks with the particle size of less than 40mm, then carrying out secondary crushing on the test blocks by using a crusher, and screening the crushed concrete small blocks with the particle size of less than 10mm by using screening equipment to finally obtain the recycled micro powder of the construction waste with the particle size of less than 0.16 mm.
The materials such as waste concrete, waste mortar and broken bricks of bricks and tiles in the construction waste can be processed into the regenerated coarse and fine aggregate with a certain particle size through the working procedures of crushing, screening, impurity removal and the like. In the process of preparing the recycled aggregate from the construction waste, a large amount of recycled micro-powder materials with the particle size of less than 0.075mm is inevitably generated at the same time, and accounts for about 15-20% of the total mass of the construction waste. The regenerated micro powder has certain activity, has better anti-seepage effect by using the regenerated micro powder as a modified material of the partition wall, can realize the resource recycling of construction wastes, and can reduce the secondary pollution of the regenerated micro powder to the environment.
c. And (3) guide wall construction:
whether the guide wall is built or not can be selected according to site conditions before the construction of the isolation wall, the guide wall needs to be built when the shallow surface of a common site is filled with soil or silty soil, the condition that soil bodies collapse holes in the grooving process is avoided, the direction of grooving equipment can be guided by the built guide wall, and the stable liquid level of slurry is guaranteed. When the guide wall is constructed, the portal columns are arranged along the axis of the guide wall in sections to control the axis of the guide wall, the excavator excavates the groove, the slope is manually repaired, the guide wall template is erected, the reinforcing mesh is placed in the template, the template is symmetrically poured, the strength reaches 70%, the template is removed, and the safety mesh is laid on the top surface of the guide wall.
d. Digging soil to form a groove:
a groove of the vertical antifouling separation wall is excavated in a soil layer between the guide walls on the two sides by adopting a hydraulic grab bucket construction method, and a grooving machine is generally provided with a verticality display instrument and an automatic deviation rectifying device to ensure deviation rectification at any time in the grooving process.
And (5) injecting bentonite slurry into the groove while excavating to form a slurry retaining wall. Because mud cakes at the joints of the groove walls can affect the quality of the joints and cause water leakage, the joints are subjected to wall brushing by a forced wall brushing machine after the grooves are excavated. And then, sweeping residual sediments at the bottom of the tank by using a hydraulic grab bucket, removing sediments at the bottom of the tank by using a reverse circulation mode, removing soil and slag sludge at the bottom of the tank from shallow to deep by using a sludge suction pipe during bottom cleaning, starting slurry exchange after the bottom sediments at the bottom of the tank are completely removed, and sampling to test whether bottom cleaning and slurry exchange are qualified.
e. Preparing a wall material of the partition wall:
mixing the recycled building waste micro powder, bentonite and in-situ foundation soil, and repeatedly rolling and turning the wall material of the partition wall directly on the ground by a bulldozer or stirring by a stirrer.
The prepared wall material can be used only after slump test and permeability test, the slump can be within the range of 100-150 mm, and the permeability coefficient is required to be less than 1 × 10-9～5×10-9m/s。
f. The bottom support plate and the interposer are fabricated in a fabrication plant according to design drawings.
g. Manufacturing a steel pipe frame, and combining into a whole:
on the ground of a construction site, horizontal steel pipes are welded between two adjacent vertical steel pipes arranged in parallel to form a single steel pipe frame, and then the steel pipes are welded and connected between the vertical steel pipes of the two adjacent steel pipe frames.
h. And welding a bottom support plate at the top of each steel pipe frame.
i. The bottom end of the interposer is mated and welded into the slot of the bottom support plate.
j. Hoisting the steel pipe frame:
the lower part of the geogrid is fixedly connected with the vertical steel pipes of the steel pipe frame by iron wires, the steel pipe frame connected into a whole is hung at the bottom of the groove of the vertical antifouling partition wall by a crane, the geogrid is laid on two sides of the groove wall, and then the upper part of the geogrid is fixed on the side face of the guide wall by U-shaped nails.
k. And (3) connecting the anti-seepage plates with each other in a hot melting way on the ground of a construction site.
I, backfilling wall materials of the partition wall:
the guide pipe is deeply inserted into the bottom of the groove at one end of the groove, so that the wall material of the isolation wall flows downwards along the guide pipe under the action of self weight, slurry in the groove is gradually replaced from the bottom upwards to form a slope gradually, the depth of the wall material of the isolation wall needs to be monitored during pouring so as to lift the guide pipe at the same time, and when the height of the wall material of the isolation wall at the guide pipe exceeds the level of the slurry, the subsequent wall material of the isolation wall can be directly filled at the top of the groove and flows downwards along the slope, so that the slope is integrally pushed forwards.
m, forming the vertical antifouling partition wall:
and (3) downwards inserting the impervious plates which are connected into a whole into the unconsolidated partition wall material, inserting the bottom ends of the impervious plates into the grooves of the inner inserting plates, and leveling the top surfaces of the impervious plates and the top surface of the wall body, so that the vertical antifouling partition wall is formed after the consolidation of the partition wall material is finished.
Because the unconsolidated partition wall material has larger slump, in order to enable the penetration-proof plate to be inserted more accurately, the invention designs the step m, and specifically comprises the following steps: installing an anti-seepage plate positioning device on the guide wall, wherein the anti-seepage plate positioning device comprises a positioning plate and an installation plate, the positioning plate is W-shaped, the bottom of the installation plate is welded with a fixed plate, the outer side of the positioning plate is welded with an auxiliary flat plate, the outer side of the auxiliary flat plate is welded with a movable plate, the movable plate is arranged in a through hole of the fixed plate, the inner side of the positioning plate is flattened by a pressure plate, so that the contact surfaces of the positioning plate and the pressure plate are positioned on the same plane, then the movable plate of the positioning plate is moved in the through hole of the fixed plate, the positioning plate extends out of the installation plate for a sufficient distance, then a fastener is screwed, the movable plate is fixed in the through hole, then the installation plate is placed on the guide wall, the positioning plate is inserted into a wall material of the separation, and when the consolidation degree of the wall material of the separation wall reaches 80 percent or more, the anti-seepage plate positioning device is integrally removed from the guide wall, and the wall material of the separation wall is consolidated to form the vertical antifouling separation wall.
The positioning plates of the two anti-seepage plate positioning devices are symmetrically arranged, so that the inserted anti-seepage plates can be positioned and guided, and the anti-seepage plates are prevented from deviating from the installation position when the wall material of the separation wall with larger slump flows. The positioning plate is designed into a W shape, so that the pressing plate can be conveniently used for flattening the inner side of the positioning plate, the contact surfaces of the positioning plate and the pressing plate are positioned on the same plane, the contact area of the positioning plate and the anti-seepage plate is reduced as much as possible, and the anti-seepage plate is prevented from being damaged. Through slightly pressing the positioning plates, the top ends of the two positioning plates for limiting the seepage-proofing plates can realize the technical effect that the top surfaces of the seepage-proofing plates are flush with the top surface of the wall body. And the anti-seepage plate positioning device can be integrally dismantled, so that the influence of the anti-seepage plate positioning device on the vertical antifouling partition wall structure is avoided.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. this steel-pipe frame is hung in the slot during vertical antifouling division wall construction, the steel-pipe frame sets up the bottom at the division wall body, the steel-pipe frame can play certain constraint effect to division wall body material, the bearing capacity of vertical antifouling division wall has been increased to a certain extent, and can reduce the impact to the slot bottom when division wall body material backfills, be favorable to keeping the slot stability, and then can reach the prevention of seepage of target, antifouling performance after guaranteeing vertical antifouling division wall to become the wall.
2. The isolation wall body is a structure formed by mixing construction waste regenerated micro powder, bentonite and in-situ foundation soil. The in-situ foundation soil refers to uncontaminated foundation soil in a site needing underground water and soil pollution prevention and control, and the isolation wall body material is required to utilize in-situ soil resources of the site to the maximum extent, so that the earthwork cost is saved. If the in-situ foundation soil is cohesive soil, the permeability is relatively small, and the in-situ foundation soil has a certain function of retarding the diffusion of pollutants; if the in-situ foundation soil is silt soil, the permeability is high. The in-situ foundation soil can not meet the permeability coefficient requirement of the vertical antifouling separation wall, so that bentonite needs to be added to form the soil-bentonite separation wall, the permeability of the wall is reduced, and the diffusion of underground pollutants can be blocked to the greatest extent in the use process. However, the strength of the partition wall formed by the in-situ foundation soil and bentonite is low, so that an improved material for improving the strength of the partition wall needs to be added.
The building waste regenerated micro powder is used as an improved material of the partition wall, the regenerated micro powder has fine particles, lower activity and the function of an inert mineral admixture, and can effectively fill the pores of the wall material when being mixed into the wall material, improve the strength of the wall, optimize the mechanical property and the anti-seepage property of the wall and reduce the deformation of the wall in the use process. The regenerated micro powder is loose and porous powder, has a large specific surface area and good pollutant adsorption capacity, and can effectively improve the antifouling performance of the vertical partition wall. But also can realize the resource recycling of the construction waste and reduce the secondary pollution of the recycled micro powder of the construction waste to the environment.
3. The thickness of the vertical antifouling partition wall in the prior art is 0.6-1.5 m, so that the excavated groove is narrow, and technical personnel cannot enter the groove to perform construction operation.
In order to solve the technical problem that the geogrid is narrow and not easy to lay, the lower portion of the geogrid is fixedly connected with a vertical steel pipe of a steel pipe frame through an iron wire, the steel pipe frame integrally connected is hung at the bottom of a groove of a vertical antifouling partition wall through a crane, the geogrid is laid on two sides of the groove wall, the upper portion of the geogrid is fixed on the side face of a guide wall through a U-shaped nail, and therefore the geogrid can be laid on two sides of the groove wall of the groove through hanging the steel pipe frame and the guide wall arranged on the ground surface.
4. Through set up the bottom support board in the steel-pipe frame for the interior picture peg of whole welding, the welding has the connection steel pipe between two adjacent steel-pipe frames moreover, makes and reserves sufficient space between two adjacent bottom support boards, and the great division wall body material of slump of being convenient for flows and backfills.
The inner insertion plate is arranged on the bottom supporting plate, so that the bottom of the anti-seepage plate inserted into the wall material of the partition wall is limited in the inner insertion plate, the anti-seepage plate is prevented from deviating from the installation position when the wall material of the partition wall with larger slump flows, and the installation quality of the anti-seepage plate is improved.
The anti-seepage plate is arranged in the wall body of the partition wall, so that the anti-seepage plate and the soil-bentonite vertical antifouling partition wall are combined into a composite vertical antifouling partition system, the anti-seepage and antifouling performances of the partition wall can be improved, and the service life of the vertical antifouling partition wall can be prolonged.
5. The positioning plates of the two anti-seepage plate positioning devices are symmetrically arranged and matched with the inner insertion plate, so that the inserted anti-seepage plates can be positioned and guided, the anti-seepage plates are prevented from deviating from the mounting positions when the wall material of the separation wall with larger slump flows, and the mounting precision of the anti-seepage plates is improved. The positioning plate is designed into a W shape, so that the pressing plate can be conveniently used for flattening the inner side of the positioning plate, the contact surfaces of the positioning plate and the pressing plate are positioned on the same plane, the contact area of the positioning plate and the anti-seepage plate is reduced as much as possible, and the anti-seepage plate is prevented from being damaged. Through slightly pressing the positioning plates, the top ends of the two positioning plates for limiting the seepage-proofing plates can realize the technical effect that the top surfaces of the seepage-proofing plates are flush with the top surface of the wall body. And the anti-seepage plate positioning device can be integrally dismantled, so that the influence of the anti-seepage plate positioning device on the vertical antifouling partition wall structure is avoided.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of the present invention during the fabrication of a steel pipe frame;
FIG. 2 is a schematic view of the present invention in a configuration where the bottom support plate is welded;
FIG. 3 is a schematic view of the bottom support plate of the present invention;
FIG. 4 is a schematic view of the present invention in a configuration for soldering an interposer;
FIG. 5 is a schematic view of an interposer according to the present invention;
FIG. 6 is a schematic view of the construction of the present invention in the state of insertion of the impermeable sheet;
FIG. 7 is a schematic structural view of the positioning device for the impermeable plate of the present invention;
FIG. 8 is a schematic view of the connection between the mounting plate and the fixing plate according to the present invention;
FIG. 9 is a schematic structural diagram of a vertical antifouling partition wall made of regenerated micropowder modified soil-bentonite in the invention.
In the figure, 1-a partition wall body; 2-a guide wall; 3-a steel pipe frame; 4-geogrid; 5-an anti-seepage plate; 6-bottom support plate; 7-a clamping groove; 8-an interposer; 9-a groove; 10-lifting lugs; 11-vertical steel pipes; 12-horizontal steel pipes; 13-connecting the steel pipes; 14-a mounting plate; 15-fixing the plate; 16-a via hole; 17-a fastener; 18-moving the plate; 19-positioning plate; 20-bolt; 21-auxiliary plate.
Detailed Description
As shown in fig. 1 to 9, the regenerated micropowder modified soil-bentonite vertical antifouling partition wall of the invention comprises a partition wall body 1 and guide walls 2 arranged on two sides of the earth surface part of the partition wall body 1. The steel pipe frame 3 is arranged at the bottom of the partition wall body 1. The steel pipe frame 3 comprises vertical steel pipes 11 and horizontal steel pipes 12, the length of each vertical steel pipe 11 is based on the design drawing, the height requirement of the bottom support plate installed in the later period is met, the horizontal steel pipes 12 are welded between the vertical steel pipes 11 which are arranged in two adjacent parallel modes, and a plurality of horizontal steel pipes 12 which are parallel to each other can be arranged between the two adjacent vertical steel pipes 11, so that the whole steel pipe frame 3 has stronger deformation resistance. The welding has the steel pipe 13 of connecting between the vertical steel pipe 11 of two adjacent steel-pipe racks 3, and the length of connecting steel pipe 13 is accurate with the design drawing, satisfies to have sufficient space between two adjacent steel-pipe racks 3, and the great division wall body material of slump of being convenient for flows and backfills, connects steel pipe 13 and makes a plurality of steel-pipe racks 3 connect into a whole, is convenient for hang and puts steel-pipe rack 3.
This vertical antifouling division wall hangs in the slot of vertical antifouling division wall and puts into steel-pipe frame 3, make steel-pipe frame 3 set up the bottom at division wall body 1, steel-pipe frame 3 can play certain constraint effect to division wall body material, increase the bearing capacity of vertical antifouling division wall to a certain extent, and can reduce the impact to the slot bottom when division wall body material backfills, be favorable to keeping the slot stability, and then can reach the prevention of seepage of target after guaranteeing vertical antifouling division wall to become the wall, antifouling performance.
The isolation wall body 1 is a structure formed by mixing construction waste regenerated micro powder, bentonite and in-situ foundation soil. With the continuous acceleration of the urbanization process in China, a series of capital construction projects continuously generate a large amount of construction wastes, and materials such as waste concrete, waste mortar, brick and tile fragments and the like in the construction wastes can be processed into regenerated coarse and fine aggregates with a certain particle size through the working procedures of crushing, screening, impurity removal and the like. In the process of preparing the recycled aggregate from the construction waste, a large amount of construction waste recycled micro powder materials with the particle size of less than 0.075mm is inevitably generated at the same time, and accounts for about 15-20% of the total mass of the construction waste. The regenerated micro powder has fine particles and low activity, has the function of an inert mineral admixture, can effectively fill the pores of a wall material when being mixed into the wall material, improves the strength of the wall, optimizes the mechanical property and the anti-seepage property of the wall, and reduces the deformation of the wall in the use process. The building waste regenerated micro powder is loose and porous powder, has a large specific surface area and good pollutant adsorption capacity, and can effectively improve the antifouling performance of the vertical partition wall. But also can realize the resource recycling of the construction waste and reduce the secondary pollution of the recycled micro powder of the construction waste to the environment.
Still include geogrid 4, geogrid 4 and steel-pipe frame 3, lead wall 2 fixed connection, geogrid 4 locates 1 both sides of division wall body. Through hanging the guide wall 2 that sets up of steel-pipe frame 3 and earth's surface, solve the slot narrow and difficult technical problem who lays geogrid 4, geogrid 4 can effectively prevent the cell wall to collapse at the in-process of bentonite mud dado, has guaranteed slot stability, has also guaranteed the integrality of vertical antifouling division wall body behind the finished wall, and then guarantees the prevention of seepage of vertical antifouling division wall, antifouling performance.
The underground water and soil pollution prevention and control device further comprises an anti-seepage plate 5, wherein the anti-seepage plate 5 is inserted into the center of the upper portion of the partition wall body 1, and the setting depth of the anti-seepage plate 5 is set according to the requirements of on-site underground water and soil pollution prevention and control. The anti-seepage plate 5 is arranged in the partition wall body 1, so that the anti-seepage plate 5 and the soil-bentonite vertical antifouling partition wall are combined into a composite vertical antifouling partition system, the anti-seepage and antifouling performances of the partition wall can be improved, and the service life of the vertical antifouling partition wall can be prolonged.
The top welding of single steel-pipe frame 3 has bottom support plate 6, and the welding has interior picture peg 8 between bottom support plate 6, and bottom support plate 6 is equipped with draw-in groove 7, and the bottom of interior picture peg 8 matches and welds in draw-in groove 7. The central part of the inner inserting plate 8 is provided with a groove 9, the width of the groove 9 is slightly larger than the thickness of the anti-seepage plate 5, and the bottom end of the anti-seepage plate 5 is inserted into the groove 9. Through set up bottom support plate 6 in steel-pipe frame 3 for wholly weld interior picture peg 8, and reserve sufficient space between two adjacent bottom support plate 6, the great barrier wall material of slump flows the backfill of being convenient for, through install interior picture peg 8 on bottom support plate 6 for the bottom of the impervious sheet 5 that inserts in barrier wall material is spacing including picture peg 8, causes the skew mounted position of impervious sheet 5 when avoiding the great barrier wall material of slump to flow. The top welding of bottom sprag 6 has the lug 10, is convenient for wholly hang and puts steel-pipe frame 3 for the preparation of steel-pipe frame 3 can be gone on subaerially, has increased the preparation space of steel-pipe frame 3. The bottom of draw-in groove 7 and interior picture peg 8 all is trapezoidal form for draw-in groove 7 is big end down's shape, and like this when welding interior picture peg 8, interior picture peg 8 can only be along 7 length direction horizontal migration of draw-in groove of bottom sprag board 6, can not reciprocate, makes interior picture peg 8 bottom can laminate the welding completely with bottom sprag board 6, reduces the welding degree of difficulty, improves welding quality.
The construction method of the regenerated micro-powder improved soil-bentonite vertical antifouling separation wall comprises the following steps:
a. preparing bentonite slurry:
the bentonite slurry is mainly used for slurry retaining walls after the grooves of the partition walls and is used as a component of the wall material of the partition walls. The bentonite slurry is left to stand for 24 hours after being fully stirred to ensure that the bentonite is fully hydrated. The main control indicators of the bentonite slurry quality are as follows: the specific gravity is 1.1-1.3, the viscosity is 18-25 s, the sand content is less than or equal to 5%, the colloid content is 95%, and the like.
b. Preparing construction waste regenerated micro powder:
the method comprises the steps of firstly carrying out overall primary crushing on waste concrete from big to small, crushing large waste concrete into small test blocks with the particle size of less than 40mm, then carrying out secondary crushing on the test blocks by using a crusher, and screening the crushed concrete small blocks with the particle size of less than 10mm by using screening equipment to finally obtain the recycled micro powder of the construction waste with the particle size of less than 0.16 mm.
The materials such as waste concrete, waste mortar and broken bricks of bricks and tiles in the construction waste can be processed into the regenerated coarse and fine aggregate with a certain particle size through the working procedures of crushing, screening, impurity removal and the like. In the process of preparing the recycled aggregate from the construction waste, a large amount of recycled micro-powder materials with the particle size of less than 0.075mm is inevitably generated at the same time, and accounts for about 15-20% of the total mass of the construction waste. The regenerated micro powder has certain activity, has better anti-seepage effect by using the regenerated micro powder as a modified material of the partition wall, can realize the resource recycling of construction wastes, and can reduce the secondary pollution of the regenerated micro powder to the environment.
c. And (3) construction of a guide wall 2:
whether the guide wall 2 is built or not can be selected according to site conditions before the construction of the isolation wall, the guide wall 2 needs to be built when the shallow surface of a common site is filled with soil or silty soil, the condition that holes are collapsed in a soil body is avoided in the grooving process, the guide wall 2 can also guide the direction of grooving equipment, and the stable liquid level of slurry is ensured. When the guide wall 2 is constructed, the portal columns are arranged along the axis of the guide wall 2 in sections to control the axis of the guide wall 2, the excavator excavates the groove, the slope is repaired manually, the guide wall 2 template is erected, the reinforcing mesh is placed in the template, the template is poured symmetrically, the strength reaches 70 percent, the safety mesh is paved on the top surface of the guide wall 2, and the strength of the guide wall is improved.
d. Digging soil to form a groove:
a groove of the vertical antifouling separation wall is excavated in a soil layer between the guide walls 2 at two sides by adopting a hydraulic grab bucket construction method, and a grooving machine is generally provided with a verticality display instrument and an automatic deviation rectifying device to ensure deviation rectification at any time in the grooving process.
And (5) injecting bentonite slurry into the groove while excavating to form a slurry retaining wall. Because mud cakes at the joints of the groove walls can affect the quality of the joints and cause water leakage, the joints are subjected to wall brushing by a forced wall brushing machine after the grooves are excavated. And then, sweeping residual sediments at the bottom of the tank by using a hydraulic grab bucket, removing sediments at the bottom of the tank by using a reverse circulation mode, removing soil and slag sludge at the bottom of the tank from shallow to deep by using a sludge suction pipe during bottom cleaning, starting slurry exchange after the bottom sediments at the bottom of the tank are completely removed, and sampling to test whether bottom cleaning and slurry exchange are qualified.
e. Preparing a wall material of the partition wall:
mixing the recycled building waste micro powder, bentonite and in-situ foundation soil, and repeatedly rolling and turning the wall material of the partition wall directly on the ground by a bulldozer or stirring by a stirrer.
The prepared wall material can be used only after slump test and permeability test, the slump can be within the range of 100-150 mm, and the permeability coefficient is required to be less than 1 × 10-9～5×10-9m/s。
f. The bottom support plate 6 and the interposer 8 are fabricated in a fabrication plant according to design drawings.
g. The steel pipe frame 3 is manufactured and combined into a whole:
on the ground of a construction site, a horizontal steel pipe 12 is welded between two adjacent vertical steel pipes 11 arranged in parallel to form a single steel pipe frame 3, and a connecting steel pipe 13 is welded between the vertical steel pipes 11 of the two adjacent steel pipe frames 3.
h. And a bottom support plate 6 is welded at the top of each steel pipe frame 3.
i. The bottom end of the interposer 8 is mated and soldered in the socket 7 of the bottom support plate 6.
j. Hoisting the steel pipe frame 3:
the lower part of the geogrid 4 is fixedly connected with the vertical steel pipe 11 of the steel pipe frame 3 by adopting an iron wire, then the steel pipe frame 3 which is connected into a whole is hung at the bottom of the groove of the vertical antifouling partition wall by adopting a crane, the geogrid 4 is laid on two sides of the groove wall, and then the upper part of the geogrid 4 is fixed on the side surface of the guide wall 2 by adopting a U-shaped nail.
k. The anti-seepage plates 5 are connected with each other in a hot melting mode on the ground of a construction site, and the anti-seepage plates 5 are directly connected in a hot melting mode, so that the connecting speed of the anti-seepage plates 5 is increased.
I, backfilling wall materials of the partition wall:
the guide pipe is deeply inserted into the bottom of the groove at one end of the groove, so that the wall material of the isolation wall flows downwards along the guide pipe under the action of self weight, slurry in the groove is gradually replaced from the bottom upwards to form a slope gradually, the depth of the wall material of the isolation wall needs to be monitored during pouring so as to lift the guide pipe at the same time, and when the height of the wall material of the isolation wall at the guide pipe exceeds the level of the slurry, the subsequent wall material of the isolation wall can be directly filled at the top of the groove and flows downwards along the slope, so that the slope is integrally pushed forwards.
m, forming the vertical antifouling partition wall:
the impervious plates 5 which are connected into a whole are downwards inserted into the unconsolidated partition wall material, the bottom ends of the impervious plates 5 are inserted into the grooves 9 of the inner inserting plates 8, the top surfaces of the impervious plates 5 are flush with the top surface of the wall body, and the vertical antifouling partition wall is formed after the consolidation of the partition wall material is completed.
Because the unconsolidated partition wall material has larger slump, in order to ensure that the penetration-proof plate 5 is inserted more accurately, the invention designs the step m, and specifically comprises the following steps: an anti-seepage plate positioning device is installed on the guide wall 2 and comprises a positioning plate 19 and an installation plate 14, the positioning plate 19 is W-shaped, a fixing plate 15 is welded at the bottom of the installation plate 14, an auxiliary flat plate 21 is welded on the outer side of the positioning plate 19, a moving plate 18 is welded on the outer side of the auxiliary flat plate 21, the moving plate 18 is arranged in a through hole 16 of the fixing plate 15, and the inner side of the positioning plate 19 is firstly flattened by a pressing plate, so that the contact surfaces of the positioning plate 19 and the pressing plate are positioned on the same plane. The moving plate 18 of the positioning plate 19 is moved in the through hole 16 of the fixed plate 15, the positioning plate 19 is extended out of the mounting plate 14 by a sufficient distance, and the fastener 17 is tightened to fix the moving plate 18 in the through hole 16. Then, the mounting plate 14 is placed on the guide wall 2, the positioning plates 19 are inserted into the wall material of the separation wall, the distance between the two positioning plates 19 is controlled, the distance between the two positioning plates 19 allows the anti-seepage plate 5 to pass through, then the mounting plate 14 is fixed on the guide wall 2 through the bolts 20, the anti-seepage plate 5 which is integrally connected is inserted downwards into the wall material of the separation wall which is not solidified along the space between the two positioning plates 19, the bottom end of the anti-seepage plate 5 is inserted into the groove 9 of the inner inserting plate 8, when the top surface of the anti-seepage plate 5 is flush with the top surface of the wall body, the positioning plates 19 are lightly pressed, so that the two positioning plates 19 limit the top end of the anti-seepage plate 5, when the solidification degree of the wall material of the separation wall reaches 80% or above, the anti-seepage plate positioning device is integrally removed from the guide wall 2.
The positioning plates 19 of the two anti-seepage plate positioning devices are symmetrically arranged, so that the inserted anti-seepage plates 5 can be positioned and guided, and the anti-seepage plates are prevented from deviating from the installation position when the wall material of the separation wall with larger slump flows. The positioning plate 19 is designed into a W shape, so that the pressing plate can be conveniently used for flattening the inner side of the positioning plate 19, the contact surfaces of the positioning plate 19 and the pressing plate are positioned on the same plane, the contact area of the positioning plate 19 and the anti-seepage plate 5 is reduced as much as possible, and the anti-seepage plate 5 is prevented from being damaged. The top ends of the anti-seepage plates 5 are limited by the two positioning plates 19 by slightly pressing the positioning plates 19, so that the technical effect that the top surfaces of the anti-seepage plates 5 are flush with the top surface of the wall body can be realized. And the anti-seepage plate positioning device can be integrally dismantled, so that the influence of the anti-seepage plate positioning device on the vertical antifouling partition wall structure is avoided.
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made based on the present invention to solve the same technical problems and achieve the same technical effects are within the scope of the present invention.
Claims (10)
1. Vertical antifouling division wall of reclaimed micropowder modified soil-bentonite, including the division wall body and set up and be in the wall of leading of division wall body earth's surface part both sides, its characterized in that: the steel pipe frame is arranged at the bottom of the wall body of the isolation wall.
2. The reclaimed micropowder modified soil-bentonite vertical antifouling partition wall according to claim 1, which is characterized in that: the isolation wall body is a structure formed by mixing construction waste regenerated micro powder, bentonite and in-situ foundation soil.
3. The reclaimed micropowder modified soil-bentonite vertical antifouling partition wall according to claim 1, which is characterized in that: still include geogrid, geogrid with the steel-pipe frame lead wall fixed connection, geogrid is located division wall body both sides.
4. The reclaimed micropowder modified soil-bentonite vertical antifouling partition wall according to claim 1, which is characterized in that: the anti-seepage plate is inserted into the center of the upper part of the wall body of the partition wall.
5. The reclaimed micropowder modified soil-bentonite vertical antifouling partition wall according to claim 4, which is characterized in that: the top of each steel pipe frame is welded with a bottom support plate, an inner inserting plate is welded between the bottom support plates, the bottom support plates are provided with clamping grooves, the bottom ends of the inner inserting plates are matched and welded in the clamping grooves, the central parts of the inner inserting plates are provided with grooves, the width of each groove is larger than the thickness of the anti-seepage plate, and the bottom ends of the anti-seepage plates are inserted into the grooves.
6. The reclaimed micropowder modified soil-bentonite vertical antifouling partition wall according to claim 5, which is characterized in that: lifting lugs are welded at the top of the bottom supporting plate.
7. The reclaimed micropowder modified soil-bentonite vertical antifouling partition wall according to claim 5, which is characterized in that: the bottom ends of the clamping groove and the inner inserting plate are in a trapezoidal shape.
8. The reclaimed micropowder modified soil-bentonite vertical antifouling partition wall according to claim 1, which is characterized in that: the steel pipe frame comprises vertical steel pipes and horizontal steel pipes, the horizontal steel pipes are welded between every two adjacent parallel vertical steel pipes, and connecting steel pipes are welded between every two adjacent vertical steel pipes of the steel pipe frame.
9. The construction method of the reclaimed micropowder modified soil-bentonite vertical antifouling partition wall based on claim 1 is characterized by comprising the following steps:
a. preparing bentonite slurry;
b. preparing construction waste regenerated micro powder:
the method comprises the steps of firstly carrying out overall primary crushing on waste concrete from big to small, crushing large waste concrete into small test blocks with the particle size of less than 40mm, then carrying out secondary crushing on the test blocks by using a crusher, and screening the crushed concrete small blocks with the particle size of less than 10mm by using screening equipment to finally obtain construction waste recycled micro powder with the particle size of less than 0.16 mm;
c. and (3) guide wall construction:
arranging a gantry column along the axis of a subsection, excavating a groove by using an excavator, manually repairing a slope, erecting a guide wall template, placing a steel bar mesh in the guide wall template, symmetrically pouring, removing the template when the strength reaches 70%, and paving a safety mesh on the top surface of the guide wall;
d. digging soil to form a groove:
excavating a groove of the vertical antifouling separation wall in a soil layer between the guide walls on the two sides by adopting a hydraulic grab bucket construction method, injecting bentonite slurry into the groove to form a slurry protective wall, brushing the wall, sweeping residual sediment at the bottom of the tank by adopting a hydraulic grab bucket, removing sediment at the bottom of the tank by adopting a reverse circulation mode, removing soil sediment sludge at the bottom of the tank from shallow to deep by a sludge suction pipe during bottom cleaning, starting slurry change after the sediment at the bottom of the tank is removed, and sampling to test whether bottom cleaning slurry change is qualified or not;
e. preparing a wall material of the partition wall:
mixing the construction waste regenerated micro powder, bentonite and in-situ foundation soil, and repeatedly rolling and turning the wall material of the partition wall directly on the air by using a bulldozer or stirring by using a stirrer;
f. manufacturing a bottom supporting plate and an inner inserting plate in a processing factory according to a design drawing;
g. manufacturing a steel pipe frame, and combining into a whole:
on the ground of a construction site, welding horizontal steel pipes between two adjacent vertical steel pipes arranged in parallel to form a single steel pipe frame, and welding connecting steel pipes between the vertical steel pipes of the two adjacent steel pipe frames;
h. welding a bottom support plate at the top of each steel pipe frame;
i. matching and welding the bottom end of the inner inserting plate in a clamping groove of the bottom supporting plate;
j. hoisting the steel pipe frame:
fixedly connecting the lower part of the geogrid with a vertical steel pipe of a steel pipe frame by adopting an iron wire, then hoisting the steel pipe frame connected into a whole by adopting a crane to the bottom of a groove of a vertical antifouling partition wall, laying the geogrid on two sides of the groove wall, and then fixing the upper part of the geogrid on the side surface of a guide wall by adopting a U-shaped nail;
k. on the ground of a construction site, the anti-seepage plates are connected with each other in a hot melting way;
i, backfilling wall materials of the partition wall:
the guide pipe is deeply inserted into the bottom of the groove at one end of the groove, so that the wall material of the isolation wall flows downwards along the guide pipe under the action of self weight, slurry in the groove is gradually replaced from the bottom to the top, a slope is gradually formed, the depth of the wall material of the isolation wall needs to be monitored during pouring so as to lift the guide pipe at the same time, and when the height of the wall material of the isolation wall at the guide pipe exceeds the level of the slurry, the subsequent wall material of the isolation wall can be directly filled at the top of the groove and flows downwards along the slope, so that the slope is integrally pushed forwards;
m, forming the vertical antifouling partition wall:
and (3) downwards inserting the impervious plates which are connected into a whole into the unconsolidated partition wall material, inserting the bottom ends of the impervious plates into the grooves of the inner inserting plates, and leveling the top surfaces of the impervious plates and the top surface of the wall body, so that the vertical antifouling partition wall is formed after the consolidation of the partition wall material is finished.
10. The reclaimed micropowder modified soil-bentonite vertical antifouling partition wall according to claim 9, which is characterized in that: in the process of step m, an anti-seepage plate positioning device is arranged on the guide wall and comprises a positioning plate and a mounting plate, the positioning plate is W-shaped, a fixing plate is welded at the bottom of the mounting plate, an auxiliary flat plate is welded at the outer side of the positioning plate, a moving plate is welded at the outer side of the auxiliary flat plate and is arranged in a through hole of the fixing plate, the inner side of the positioning plate is flattened by a pressing plate, so that the contact surfaces of the positioning plate and the pressing plate are positioned on the same plane, then the moving plate of the positioning plate moves in the through hole of the fixing plate, the positioning plate extends out of the mounting plate for a sufficient distance, then a fastener is screwed, the moving plate is fixed in the through hole, then the mounting plate is placed on the guide wall, the positioning plate is inserted into the wall material of the separation wall, then the distance between the two positioning plates, and when the consolidation degree of the wall material of the separation wall reaches 80 percent or more, the anti-seepage plate positioning device is integrally removed from the guide wall, and the wall material of the separation wall is consolidated to form the vertical antifouling separation wall.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113846700A (en) * | 2021-10-21 | 2021-12-28 | 浙江水利水电学院 | Vertical impervious soil-bentonite curtain structure and construction method |
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