CN112411527A - Blocking method for in-situ remediation of polluted land under complex working conditions - Google Patents
Blocking method for in-situ remediation of polluted land under complex working conditions Download PDFInfo
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- CN112411527A CN112411527A CN202011120492.XA CN202011120492A CN112411527A CN 112411527 A CN112411527 A CN 112411527A CN 202011120492 A CN202011120492 A CN 202011120492A CN 112411527 A CN112411527 A CN 112411527A
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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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Soil Sciences (AREA)
- Processing Of Solid Wastes (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a blocking method for in-situ remediation of a polluted land block under a complex working condition, which comprises the following steps of firstly, reserving enough safe distance at two sides of a structure according to the design requirement of a safe blocking pile wall, wherein the safe distance is more than 0.5m, and the periphery of the structure is cleaned to form a space; the artificial drilling, grind the sharp-pointed position of the inferior part of the bit at first, the drilling diameter is not smaller than the design diameter of the pile wall, drill and sink slowly with the manual work, intersect and go on in turn in batches, each batch is three consecutive, sink to exceed the suspected depth of the structure or depth that the design of the safe barrier pile wall requires; if the structure is not met, performing a high-pressure rotary spraying process, and if the structure is met, stopping the artificial drilling immediately; the high-pressure rotary spraying process comprises the following steps: the access point of the construction machine is the middle one of the three manual drilling positions. The invention discloses how to effectively and comprehensively carry out safe separation pile wall construction under a complex working condition, thereby avoiding a plurality of problems caused by stagnation construction due to rough construction.
Description
Technical Field
The invention belongs to the field of soil remediation, particularly relates to the field of contaminated land remediation, and more particularly relates to a blocking method for in-situ remediation of contaminated lands under complex working conditions of production enterprises.
Background
According to incomplete statistics, the polluted plots in China are at least 30 ten thousand. In combination with the current pollution condition of the land, the restoration of the polluted land is very important. The land parcel restoration technology is a technology which changes the pollution structure in the polluted land parcel to be processed by utilizing a series of physical, chemical and biological processing processes, or reduces the migration and toxicity of pollutants in the polluted land parcel through various reactions, and is called as the polluted land parcel restoration technology. When contaminated plots with similar conditions are encountered, contaminated plot remediation activities can be rapidly conducted based on prior experience. In actual research, a plurality of plots are all composite pollution with various pollutants, the pollutants in the plots are difficult to be completely removed by only using a single repairing method, the period of some repairing technologies is long, and the disturbance and the cost on soil are high. Soil remediation is being developed in a direction to improve the removal efficiency, economic and time benefits of complex pollutants.
The existing remediation method of the polluted land comprises the following (1) phytoremediation technology, the phytoremediation technology is commonly applied at the present stage, and by means of the effects of extraction, stabilization, volatilization and the like of plants in the growth process, some pollutants in the original soil of the field can be well treated, the content of the pollutants is effectively reduced, and the aim of soil improvement is further achieved. The subsequent treatment of phytoremediation also becomes a focus of discussion, and the phytoremediation cycle is relatively long. (2) The microorganism remediation technology can also play a strong positive role in the remediation treatment of the soil in the industrial polluted site by the application of microorganisms, and various heavy metals and organic pollutants can form ideal harmless treatment under the action of the microorganisms, so that the pollution degree of soil components is reduced. The soil environment depth of the land is greatly changed and is easily influenced by the external environment, the continuous stable effectiveness of the microorganism is difficult to ensure, and the method becomes an important restriction factor for the restoration and development of the microorganism. (3) The thermal desorption technology can also form a soil remediation effect by applying the thermal desorption technology aiming at a large amount of pollutants in an industrial polluted site, so that the large amount of pollutants in soil components can be controlled and treated. The application of the thermal desorption technology is mainly to fully utilize heat energy to effectively volatilize related pollutants, ensure that the pollutants can be separated from the original soil environment and reduce the pollution degree of the field soil. Thermal desorption requires a series of engineering measures such as excavation and stacking treatment of contaminated soil, and the cost is high.
In recent years, more and more polluted soil and underground water in production enterprises are polluted, because of the particularity of the production enterprises, the normal operation of the enterprises is guaranteed while the polluted soil and the underground water are restored, large-scale engineering measures are not suitable to be taken, the in-situ restoration method of the polluted land is more and more favored, the in-situ restoration method needs to extract and inject the underground water of the land, the underground water outflow during the treatment period is difficult to control, and therefore the polluted land and the surrounding environment are safely blocked, and the surrounding ecological environment is ensured not to be influenced.
The principle of the barrier technology is that polluted soil or a treated medium is placed in a safe barrier area, or a barrier layer is laid to block the way of migration and diffusion of pollutants in the field, so that the polluted field is isolated from the surrounding environment, and the pollutants are prevented from contacting human bodies and migrating along with rainfall or underground water to further cause harm to the human bodies and the surrounding environment. The pollutant types which can be treated by the barrier technology comprise heavy metals, organic matters and heavy metal organic compound contaminated soil.
Construction machinery of the barrier technology is generally large, needs a certain operation space, has strict requirements on site environment, and needs to fully master the conditions of the construction operation place on the ground, particularly underground. In the product enterprise, aerial pipe gallery vertically and horizontally staggered can adopt the mode of dismantling machinery to dodge for keeping pipe gallery integrality. The underground is buried with structures with different depths and unknown directions, such as pipelines, culvert ditches, cables, pools and the like, the related positions cannot be accurately mastered, and if the structures cannot be effectively solved in time, the safety barrier construction efficiency and the engineering progress are seriously influenced.
Disclosure of Invention
Aiming at the technical problems, the invention discloses how to effectively and comprehensively carry out safe blocking pile wall construction under a complex working condition so as to avoid a plurality of problems caused by stagnation construction due to rough construction.
In order to achieve the above purpose, the invention provides the following technical scheme:
in particular to a blocking method for in-situ remediation of a polluted land block under a complex working condition, which comprises the following process steps:
firstly, reserving enough safety distance at two sides of a structure according to the design requirement of a safety barrier pile wall, and cleaning enough drilling operation space at the periphery of the structure;
secondly, manually drilling, namely firstly grinding the sharp part at the lower part of a drill bit, wherein the drilling diameter is not smaller than the designed diameter of the pile wall, manually and slowly drilling and sinking, wherein the drilling and sinking are carried out in sequence in batches, each batch comprises three continuous drilling and sinking to a depth exceeding the suspected depth of a structure or the depth required by the design of a safety barrier pile wall; if the structure is not met, performing a high-pressure rotary spraying process, and if the structure is met, stopping the artificial drilling immediately;
thirdly, the high-pressure rotary spraying process comprises the following steps: the access point of the construction machine is the middle one of the three manual drilling positions.
Furthermore, in the first step, the two sides of the structure are left with enough safety distance and are more than 0.5 m.
Furthermore, in the first step, two detection wells are arranged in the blocking pile wall at the notch, and two comparison wells are arranged outside the blocking pile wall.
Further, the method for measuring the suspected depth in the second step is as follows: prior to drilling, other technical means have been used, such as: geophysical prospecting, ground penetrating radar, etc., to explore the depth range of the structure.
Further, in the second step, if the structure is not met, a high-pressure rotary spraying process is carried out, specifically: the access point of the high-pressure jet grouting construction machine is a drilling position in the middle of the three continuous manual drilling.
Furthermore, in the second step, the diameter of the artificial drilling tool is not lower than the designed diameter of the pile wall, and the length of the drill rod is not lower than the depth of the pile wall.
The method is characterized in that a mode of combining manual drilling and high-pressure rotary jetting technology or other technologies is adopted, the depth and the direction of a structure cannot be mastered, enough safety distance (larger than 0.5 m) is reserved on two sides of the structure according to the design requirement of a safety barrier pile wall, and a certain space is cleared around the structure, so that the integrity and the integrity of the structure are ensured, and the manual drilling and high-pressure rotary jetting technology has enough working space.
The artificial drilling process comprises the steps of firstly, grinding sharp parts at the lower part of a drill bit, wherein the drilling diameter is not smaller than the designed diameter of a pile wall, drilling and sinking slowly by manpower, sequentially and alternately carrying out in batches, wherein each batch comprises three continuous drilling and sinking to a depth exceeding the suspected depth of a structure or the design requirement of a safety barrier pile wall, if the depth does not meet the structure, carrying out a high-pressure rotary jetting process, and an access point of a high-pressure rotary jetting construction machine is a drilling position in the middle of the three continuous artificial drilling; if the structure is met, the manual drilling is immediately stopped, the specific position, depth and direction of the structure are accurately mastered, and the next construction is immediately carried out, so that the structure can be smoothly avoided.
The invention has the following beneficial effects:
(1) the method can be used for detecting unknown underground structures, can be used for safe blocking pile wall engineering, and can be applied to other problems related to the problem.
(2) The integrity of the structure is ensured, the integrity and the integrity of the underground structure at the whole construction section can be ensured, the structure does not need to be damaged, and the normal use is not influenced.
(3) The continuity of the safety barrier pile wall is ensured, no space is required to be reserved for avoiding structures during the construction of the safety barrier pile wall, the continuity and the integrity of the whole pile wall are ensured, and the potential safety hazard of the surrounding ecological environment is eliminated.
(4) The operation is simple, and large-scale excavation and other engineering measures are not needed.
Detailed Description
The present invention will be further illustrated below with reference to specific embodiments, which are to be understood as merely illustrative and not limitative of the scope of the present invention.
Example 1
A blocking method for in-situ remediation of a polluted land block under a complex working condition comprises the following process steps:
firstly, reserving enough safety distance at two sides of a structure according to the design requirement of a safety barrier pile wall, wherein the safety distance is more than 0.5m, and the periphery of the structure is cleaned to form a space;
secondly, manual drilling, namely, firstly, grinding the sharp part at the lower part of a drill bit, wherein the drilling diameter is not less than the designed diameter of the pile wall, drilling and sinking slowly by manual, and sequentially intersecting the three continuous drilling and sinking in batches until the depth exceeds the suspected depth of the structure or the depth required by the design of the safety barrier pile wall (the suspected depth is determined by using other technical means such as geophysical prospecting, ground penetrating radar and the like to find out the depth range of the structure before drilling); if the structure is not met, performing a high-pressure rotary spraying process, and if the structure is met, stopping the artificial drilling immediately;
thirdly, the high-pressure rotary spraying process comprises the following steps: the access point of the construction machine is the middle one of the three manual drilling positions.
Safety blocking pile wall construction is required to be carried out around a polluted land of a chemical industry enterprise, the design depth of the pile wall is 16 meters, the width of the pile wall is 700mm, cable pipes with the depth of about 6 meters are arranged on the design line of the pile wall, 20kv high-voltage wires penetrate through the cable pipes, and the exact depth, position and direction are unclear. The safety construction of the separation pile wall is ensured, during the construction of the section, the safety distance of about 3 m notches is reserved around the suspected position of the cable, if the safety distance cannot be solved, the continuity and the integrity of the safety separation pile wall are difficult to ensure, and the safety risk control requirement of the whole polluted land can not be met.
Firstly, preparing an artificial drilling tool with a drill bit of 700mm in diameter and a drill rod of 18 m in length, sequentially intersecting from one side of a gap to the other side for artificial drilling, continuously performing three artificial drilling tools in the first batch, wherein the depth of the artificial drilling tools is 10 m, no cable pipe is encountered, performing high-pressure rotary spraying process construction on the front two artificial drilling tools, and immediately stopping after the construction. And then carrying out a second batch of three manual drilling, wherein the second probe is sunk to 7.1 meters and meets the cable tube, and the operation is immediately stopped at the moment, so that the accurate depth, position and direction of the cable tube are marked. And continuously constructing by using a high-pressure rotary spraying process in the next step, and preparing to avoid the position of the cable tube until the notch is completely repaired. The construction is accomplished the back and is detected the cable intact, does not influence normal use, sets up two detection wells in the separation stake wall of breach department, sets up two contrast wells outside the separation stake wall.
TABLE 1 groundwater monitoring data in 1 year at this gap in a certain production facility plot
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (6)
1. A blocking method for in-situ remediation of a polluted land block under a complex working condition is characterized by comprising the following steps:
firstly, reserving enough safety distance at two sides of a structure according to the design requirement of a safety barrier pile wall, and cleaning enough drilling operation space at the periphery of the structure;
secondly, manually drilling, namely firstly grinding the sharp part at the lower part of a drill bit, wherein the drilling diameter is not smaller than the designed diameter of the pile wall, manually and slowly drilling and sinking, wherein the drilling and sinking are carried out in sequence in batches, each batch comprises three continuous drilling and sinking to a depth exceeding the suspected depth of a structure or the depth required by the design of a safety barrier pile wall; if the structure is not met, performing a high-pressure rotary spraying process, and if the structure is met, stopping the artificial drilling immediately;
thirdly, the high-pressure rotary spraying process comprises the following steps: the access point of the construction machine is the middle one of the three manual drilling positions.
2. The blocking method for in-situ remediation of contaminated land under complex conditions as claimed in claim 1, wherein: in the first step, enough safety distance is left between two sides of the structure and is larger than 0.5 m.
3. The blocking method for in-situ remediation of contaminated land under complex conditions as claimed in claim 2, wherein: in the first step, two detection wells are arranged in the blocking pile wall at the notch, and two comparison wells are arranged outside the blocking pile wall.
4. The blocking method for in-situ remediation of contaminated land under complex conditions as claimed in claim 1, wherein: the method for measuring the suspected depth in the second step comprises the following steps: before drilling, the depth and location range of the structure is explored using geophysical or georadar.
5. The blocking method for in-situ remediation of contaminated land under complex conditions as claimed in claim 1, wherein: in the second step, if the structure is not met, a high-pressure rotary spraying process is carried out, and the method specifically comprises the following steps: the access point of the high-pressure jet grouting construction machine is a drilling position in the middle of the three continuous manual drilling.
6. The blocking method for in-situ remediation of contaminated land under complex conditions as claimed in claim 1, wherein: in the second step, the diameter of the artificial drilling tool is not less than the designed diameter of the pile wall, and the length of the drill rod is not lower than the depth of the pile wall.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011120492.XA CN112411527A (en) | 2020-10-19 | 2020-10-19 | Blocking method for in-situ remediation of polluted land under complex working conditions |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011120492.XA CN112411527A (en) | 2020-10-19 | 2020-10-19 | Blocking method for in-situ remediation of polluted land under complex working conditions |
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| CN112411527A true CN112411527A (en) | 2021-02-26 |
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Cited By (2)
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| CN114809105A (en) * | 2022-03-03 | 2022-07-29 | 北京中岩大地环境科技有限公司 | In-situ horizontal multi-layer barrier construction method |
| CN115026123A (en) * | 2022-06-20 | 2022-09-09 | 中交第三航务工程局有限公司 | In-situ chemical oxidation combined remediation method for land pollution |
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Application publication date: 20210226 |