CN115897757A - Method and system for slurry treatment and water circulation for excavation construction - Google Patents

Abstract

The application discloses a method and a system for treating slurry and circulating water for construction by a flushing and excavating method, which relate to the technical field of hydraulic engineering, and the method comprises the following steps: clearing a soil-piled area; excavating blind ditches and water ditches in the mound area; laying a first film in the blind ditch and the grid; sequentially laying a degradable plastic drain pipe, a first layer of geotextile, broken stones and a second layer of geotextile above the first film in the blind ditch; arranging soil bag cofferdams around the soil piling area; laying a second film on the inner side of the cofferdam; a sedimentation tank communicated with the ditch is arranged outside the cofferdam; pumping and conveying the slurry formed after water jet excavation into the cofferdam, filtering the slurry through the soil body and the blind ditch after the slurry is stood, flowing to the ditch from the drain pipe, and then flowing to the sedimentation tank from the ditch, and supplying the settled water for water jet excavation and recycling. The method and the system for treating the slurry and circulating the water for the construction of the excavation method, which are provided by the specification, can improve the utilization rate of water resources, reduce the consumption of the water resources and avoid the pollution of the slurry to the environment.

Description

Method and system for slurry treatment and water circulation for excavation construction

Technical Field

The specification relates to the technical field of hydraulic engineering, in particular to a method and a system for treating slurry and circulating water for construction by a flushing and excavating method.

Background

Along with the development of cities and the progress of society, the demand of people on spiritual civilization is continuously improved, the requirements on living environment are higher and higher, and the newly-built artificial lake and the rockery have the comprehensive functions of city beautification, leisure entertainment, flood control and waterlogging drainage. In the prior art, a mechanical excavation mode is mostly adopted to construct artificial lakes, rockery and other landscapes. The construction of the mechanical excavation mode has the advantages of high construction speed, convenience in transfer, flexibility in operation and the like, but the construction cost is high, the requirement on the bearing capacity of the foundation of a mechanical station and a transportation line is high, dust is easily caused to affect the environment, and the construction of the proper geology by adopting the excavation method is better.

The excavation method mainly adopts a high-pressure water injection mode to cut and mix soil bodies into slurry, and then a slurry pump is matched with a pipeline to pump the slurry to a specified position. The construction by the punching and digging method has the advantages of no dust emission, low cost, easy management and the like, and is particularly suitable for high-fill rockery piling construction.

However, the excavation process consumes a large amount of water and produces a large amount of slurry. At present, the common method for treating the slurry is to permeate into the ground after natural standing, and the method has the risk of polluting the ground water.

Disclosure of Invention

In view of the defects of the prior art, the purpose of the present specification is to provide a method and a system for treating slurry and circulating water for the construction of a excavation method, which can improve the utilization rate of water resources, reduce the consumption of the water resources and avoid the pollution of the slurry to the environment.

In order to achieve the above object, embodiments of the present disclosure provide a method for treating slurry and circulating water for use in excavation, including the steps of:

clearing a soil-piled area;

excavating communicated blind ditches and water ditches in the soil-piled area; the blind ditches comprise main blind ditches and branch blind ditches, wherein the main blind ditches are communicated with each other and extend along a first direction, and the branch blind ditches extend along a second direction, and the first direction is perpendicular to the second direction; the main road blind ditches and the branch road blind ditches divide a plurality of grids in the mound area; the slopes of the main blind ditch and the branch blind ditches enable liquid to flow from the branch blind ditches to the main blind ditches and then to the water ditches;

laying a first film in the blind ditch and the grid; the first film is a degradable plastic film;

sequentially laying a degradable plastic drain pipe, a first layer of geotextile, broken stones and a second layer of geotextile above the first film in the blind ditch; the wall of the drain pipe is provided with a plurality of through holes for water to flow through; the diameter of the drain pipe of the main path blind ditch is larger than that of the branch path blind ditch;

arranging soil bag cofferdams around the soil piling area; the ditch surrounds the cofferdam;

laying a second film on the inner side of the cofferdam; the second film is a degradable plastic film and is pressed on the first film at the bottom of the cofferdam;

a sedimentation tank communicated with the ditch is arranged outside the cofferdam;

pumping and conveying slurry formed after water jet excavation into the cofferdam, filtering the slurry through a soil body and the blind ditch after the slurry is stood, enabling the slurry to flow to the ditch from the drain pipe, then flowing to the sedimentation tank from the ditch, and supplying the settled water to the water jet excavation for recycling.

As a preferred embodiment, in the step of excavating the communicated blind ditch and ditch in the mound area, the slope of the bottom of the blind ditch is not less than 2%, and the height of the middle of the grid is lower than that of the periphery of the grid, and the slope of the grid is not less than 2%.

In a preferred embodiment, in the step of excavating the communicated blind ditches and ditches in the mound area, the distance between the adjacent branch blind ditches is not more than 4m, and the distance between the adjacent main road blind ditches is not more than 10m; the branch blind ditch is provided with bidirectional drainage, two ends of the branch blind ditch are connected with the main road blind ditch, the main road blind ditch is provided with a water flowing direction according to the position of the sedimentation tank, and the main road blind ditch is connected with the water ditch.

In a preferred embodiment, in the step of excavating the communicated blind ditches and ditches in the mound area, the section excavation size of the branch blind ditches is 200mm × 400mm, and the section excavation size of the main road blind ditches is 500mm × 700mm; the diameter of the drain pipe of the main path blind ditch is 500mm, and the diameter of the drain pipe of the branch path blind ditch is 200mm.

In a preferred embodiment, in the step of laying a first film in the blind ditches and the grids, the first film at the high position is covered with the first film at the low position, the overlapping size of two adjacent first films is not less than 100mm, and the two adjacent first films are adhered by glue.

In a preferred embodiment, in the step of laying a degradable plastic drain pipe, a first layer of geotextile, broken stones and a second layer of geotextile in sequence above the first film in the blind ditch, before laying the drain pipe, a medium coarse sand cushion layer is filled on the first film in the blind ditch; the gradient of the drain pipe is equal to the gradient of the blind ditch.

As a preferred embodiment, the first membrane is turned up at least 500mm around the mound area; the second film extends inwards for at least 500mm at the bottom of the cofferdam, and the second film is higher than the top of the cofferdam by at least 500mm and is folded to the top surface of the cofferdam.

In a preferred embodiment, the degradation time of the first film, the second film and the drain pipe is not shorter than the construction time of the slurry treatment and water circulation method for the excavation construction.

As a preferred embodiment, the slurry in the cofferdam is settled and then separated out, the soil body is compacted and then arranged with an upper layer of cofferdam, the upper layer of cofferdam is folded inwards than the lower layer of cofferdam according to the designed soil piling gradient, and the inner side of the upper layer of cofferdam is provided with a third film; the third film is a degradable plastic film, and the bottom of the upper cofferdam layer is covered above the second film; the third film extends inwards for at least 500mm from the bottom of the upper layer of cofferdam, and the top of the third film above the upper layer of cofferdam is at least 500mm higher than the top of the upper layer of cofferdam and is folded to the top surface of the upper layer of cofferdam.

The embodiment of the present specification further provides a system for slurry treatment and water circulation for excavation construction, including:

the blind ditch and the ditch are communicated and arranged in the soil piling area; the blind ditches comprise main blind ditches and branch blind ditches, wherein the main blind ditches are communicated with each other and extend along a first direction, and the branch blind ditches extend along a second direction, and the first direction is perpendicular to the second direction; the slopes of the main blind ditch and the branch blind ditches enable liquid to flow from the branch blind ditches to the main blind ditches and then to the water ditches;

a plurality of grids divided by the main road blind ditches and the branch road blind ditches in the mound area;

a first membrane laid within the blind trench and the grid; the first film is a degradable plastic film; a degradable plastic drain pipe, a first layer of geotextile, broken stones and a second layer of geotextile are sequentially paved above the first film in the blind ditch; the wall of the drain pipe is provided with a plurality of through holes for water to flow through; the diameter of the drain pipe of the main path blind ditch is larger than that of the branch path blind ditch;

a soil bag cofferdam arranged around the soil piling area; the ditch surrounds the cofferdam;

a second film laid on the inner side of the cofferdam; the second film is a degradable plastic film and is pressed on the first film at the bottom of the cofferdam;

and the sedimentation tank is arranged outside the cofferdam and communicated with the ditch.

Has the advantages that:

according to the method and the system for treating the slurry and circulating the water for the construction of the flushing and digging method, the degradable plastic film and the broken stone geotextile blind ditch are arranged at the bottom, the water can be collected and filtered, the slurry is filtered through the soil body and the blind ditch after standing in the cofferdam, the slurry flows to the ditch from the drain pipe and then flows to the sedimentation tank from the ditch, the water after sedimentation is supplied for water jetting, flushing and digging for recycling, the water resource consumption can be reduced, the water resource utilization rate is improved, the environment pollution caused by the slurry is avoided, the influence of flushing and digging of rockery piling on the surrounding environment is reduced, and the water is saved and the environment is protected in the construction process of the lake ripple. In addition, through setting up degradable plastic film and degradable plastics drain pipe, new and old soil body inlays each other admittedly and forms whole, has good anti slippage ability.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.

FIG. 1 is a flow chart illustrating the steps of a method for treating slurry and circulating water for use in excavation according to the present embodiment;

FIG. 2 is a schematic plan view of a system for treating slurry and circulating water for use in excavation according to the present embodiment;

FIG. 3 isbase:Sub>A schematic cross-sectional view taken along the line A-A in FIG. 2;

FIG. 4 is a schematic cross-sectional view taken along the line B-B in FIG. 2;

fig. 5 is a schematic cross-sectional structure view of a bypass blind trench provided in the present embodiment;

fig. 6 is a schematic cross-sectional structure view of a main road blind ditch provided in the present embodiment;

FIG. 7A is a schematic structural view after a layer of cofferdam is constructed;

FIG. 7B is a schematic structural view after a third layer of cofferdam is constructed;

fig. 7C is a schematic structural view after all layers of cofferdams are constructed and soil piling is completed.

Description of reference numerals:

1. a main road blind ditch; 2. branch blind ditches; 3. a ditch; 4. a grid; 5. a first film; 6. a medium coarse sand cushion layer; 7. a first drain pipe; 8. a second drain pipe; 9. crushing stone; 11. cofferdam; 12. a second film; 13. a sedimentation tank; 14. a cofferdam layer is arranged; 15. a third film; 16. a soil body; 17. a third layer of cofferdam; 18. a fourth film; 19. designing a top surface; x, a first direction; y, second direction.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments in the present invention, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to fig. 1. The embodiment of the application provides a method for treating slurry and circulating water for construction by a dredging method, which comprises the following steps:

step S100: and cleaning the soil heaping area.

Specifically, before the soil is piled in the planned or designed soil piling area, soil layers with poor mechanical properties, such as miscellaneous fill, silt and the like on the surface of the field, and sharp grass roots, stones and the like need to be removed.

Step S200: and excavating a blind ditch and a water ditch 3 which are communicated with each other in the soil piling area.

The blind ditches comprise a main blind ditch 1 extending along a first direction X and a branch blind ditch 2 extending along a second direction Y, which are communicated with each other, wherein the first direction X is perpendicular to the second direction Y. The first direction X and the second direction Y may be two directions perpendicular to each other in a horizontal plane perpendicular to the vertical direction. In one embodiment, the mound area may be designed to be rectangular, with the long side of the mound area extending in the second direction Y and the short side of the mound area extending in the first direction X, as shown in fig. 2. Specifically, the mound area may be a rectangular area having a length of 45m and a width of 25 m.

With continued reference to fig. 2, the main blind ditches 1 and the branch blind ditches 2 divide a plurality of grids 4 in the mound area, and the size of the grids 4 is determined by the spacing of the blind ditches. Preferably, the distance between the adjacent branch blind ditches 2 is not more than 4m, and the distance between the adjacent main blind ditches 1 is not more than 10m.

In order to drain water from the grid 4 into the blind ditch and then out of the blind ditch, the grid 4 and the blind ditch need to have a certain gradient. The slopes of the main blind ditch 1 and the branch blind ditches 2 enable liquid to flow from the branch blind ditches 2 to the main blind ditch 1 and then to the water ditch 3. Preferably, in step S200, the bottom slope of the blind ditch is not less than 2%. The height of the middle of the grid 4 is low, and the gradient is not less than 2%.

Specifically, as shown in fig. 2, the direction of the arrow in fig. 2 indicates the flow direction of water, the branch blind ditch 2 is provided with bidirectional drainage, and both ends of the branch blind ditch 2 are connected with the main blind ditch 1. The main blind ditch 1 reasonably sets the water flowing direction according to the position of the sedimentation tank 13, and the main blind ditch 1 is connected with the water ditch 3.

In the present embodiment, the blind ditch and the ditch 3 may be excavated by a mechanical-assisted manual method. In a specific embodiment, as shown in fig. 5, the section excavation size of the branch blind ditch 2 can refer to 200mm × 400mm; as shown in fig. 6, the main blind ditch 1 may have a cut surface excavation size of 500mm × 700mm. As shown in fig. 3, the branch blind ditches 2 are uniformly distributed along the first direction X; as shown in fig. 4, the plurality of main road blind ditches 1 are uniformly distributed along the second direction Y. The gutter 3 may have a width of 500mm and a depth of 800mm.

After the blind ditch is excavated, the bottom slope of the groove needs to be manually trimmed and tamped to remove grass roots and stones, cement mortar can be adopted to coat the side wall of the blind ditch as necessary, and the blind ditch is communicated as required and is guaranteed to be smoothly connected.

Step S300: a first film 5 is laid in the blind ditches and the grid 4.

Wherein the first film 5 is a degradable plastic film. The size of the single first thin film 5 is limited, the area of the soil accumulation area is extremely large, and therefore, a plurality of first thin films 5 are required to be assembled to cover the bottoms of all the blind ditches and the surface of the grid 4. At the joint of the two first films 5, the first film 5 positioned at the high position presses the first film 5 positioned at the low position, and the water flow smoothly flows into the blind ditch along the water flowing direction. The membrane enters the bottom of the blind ditch at the blind ditch position to guide water flow into the blind ditch. The overlapping size of the two adjacent first films 5 is not less than 100mm, and the two adjacent first films 5 are adhered by glue. The first film 5 is required to have a certain strength and tear resistance, and the thickness can be determined by tests, and the degradation time is not shorter than the construction time of the slurry treatment and water circulation method for the excavation construction. The first film 5 is fully paved in the soil piling area, and the first film 5 has the effect of helping the soil piling area to prevent seepage. The first membrane 5 is turned up at least 500mm around the mound area to overlap the following second membrane 12.

Step S400: and sequentially laying a degradable plastic drain pipe, a first layer of geotextile, broken stones 9 and a second layer of geotextile above the first film 5 in the blind ditch.

Wherein, a medium-coarse sand cushion layer 6 can be filled on the first film 5 in the blind ditch before the drain pipe is laid. And laying degradable plastic drainage pipes with corresponding sizes according to the sizes of the blind ditches. Specifically, a first drainage pipe 7 with a larger diameter as shown in fig. 6 is laid in the main blind ditch 1, and a second drainage pipe 8 with a smaller diameter as shown in fig. 5 is laid in the branch blind ditch 2. The diameter of the first water discharge pipe 7 is larger than the diameter of the second water discharge pipe 8. In one embodiment, the first drain pipe 7 may have a diameter of 500mm, and the second drain pipe 8 may have a diameter of 200mm.

In this embodiment, the drain pipe should have a certain strength, a wall thickness that can be determined by experiment, and a degradation time that is not shorter than the construction time of the slurry treatment and water circulation method for the excavation construction. The water discharge pipes are mutually communicated to form a pipe network according to requirements. The gradient of the drain pipe is consistent with that of the blind ditch. The wall of the drain pipe is provided with a plurality of through holes for water to flow through, so that water flow can smoothly enter the drain pipe. The through holes are uniformly distributed on the pipe wall of the drain pipe.

Furthermore, a first layer of geotextile (not shown) is laid above the drainage pipe, graded broken stones 9 are filled in the blind ditch, and the graded proportion of the broken stones 9 is determined according to tests so as to achieve a better filtering effect. The backfilled surface is slightly lower than the original ground surface, and then a second layer of geotextile (not shown) is wrapped on the backfilled surface for filtering the water body.

Step S500: and arranging soil bag cofferdams 11 around the soil piling area.

The earth bag cofferdam 11 can be arranged around the soil piling area according to the design outline, and the height, width, gradient and other relevant parameters of the cofferdam 11 can be constructed according to the design or scheme requirements. The water channel 3 surrounds the cofferdam 11.

Step S600: a second film 12 is laid on the inside of said cofferdam 11.

Wherein, the second film 12 is a degradable plastic film, and the degradation time of the second film 12 is not shorter than the construction time of the slurry treatment and water circulation method for the excavation construction. The second membrane 12 is pressed over the first membrane 5 at the bottom of the weir 11. Said second film 12 extends at least 500mm inwards at the bottom of said cofferdam 11 to overlap the first film 5. Said second film 12 is folded over at least 500mm at the top of said cofferdam 11 to the top surface of said cofferdam 11 to overlap with a third film 15 hereinafter. The second films 12 are laid in the height range of the inner side of the cofferdam 11, and the second films 12 have the effect of helping the cofferdam 11 to prevent seepage.

Step S700: and a sedimentation tank 13 communicated with the ditch 3 is arranged outside the cofferdam 11.

Wherein, the sedimentation tank 13 can be a five-stage sedimentation tank 13, and has better sedimentation effect.

Step S800: pumping and conveying the slurry formed after water jet excavation into the cofferdam 11, filtering the slurry through the soil body 16 and the blind ditch after standing, flowing to the ditch 3 from the drain pipe, and then flowing to the sedimentation tank 13 from the ditch 3, wherein the settled water is supplied for water jet excavation and recycling.

Wherein, the mud can be formed after water jetting is dug when the method of digging is adopted to carry out lake ripple construction or rockery piling, and the mud can be pumped into the cofferdam 11 through the pipeline.

As shown in fig. 7A, the slurry in the cofferdam 11 (i.e. the first cofferdam) is settled and then water is separated out, and after the soil body 16 is compacted, a layer of cofferdam 14 (i.e. the second cofferdam) can be arranged. The upper layer of cofferdam 14 is folded inwards than the lower layer of cofferdam 11 according to the designed soil piling slope, and the inner side of the upper layer of cofferdam 14 is provided with a third film 15. The third film 15 is a degradable plastic film, and the bottom of the upper layer of cofferdam 14 of the third film 15 is covered above the second film 12. Said third film 15 extends inwardly at least 500mm from the bottom of the upper bank 14 to overlap the second film 12. Said third film 15 is folded over the top of the upper cofferdam 14 by at least 500mm to overlap the lower fourth film 18 and help the upper cofferdam 14 to be impermeable.

And after the upper cofferdam 14 is arranged, pumping the slurry into the upper cofferdam 14 for water body filtration. As shown in fig. 7B, after the slurry in the upper cofferdam 14 is settled, water is separated out, and after the soil body 16 is compacted, a third cofferdam 17 can be arranged, the third cofferdam 17 is folded inwards than the second cofferdam 14 according to the designed soil piling gradient, and a fourth film 18 is arranged on the inner side of the third cofferdam 17. The cofferdam filling, slurry storage and water filtration process is repeated until the soil mass 16 reaches the design top surface 19, as shown in fig. 7C. The first film 5, the second film 12, the third film 15, and the fourth film 18 may be the same film, but the present application is not limited thereto. The film is turned over 500mm on the top of each layer of cofferdam and is used for lap joint when the upper layer of cofferdam is piled.

After the lake ripple excavation and the rockery stacking are completed according to the design requirements, the degradable plastic film is biodegraded, and then the stacking soil body 16 and the original soil body form a whole; the degradable plastic drain pipe is biodegraded, soil bodies at the blind ditches are uniformly sunken, the blind ditches do not work any more, and new and old soil bodies are mutually embedded and resist sliding.

According to the method and the system for treating the slurry and circulating the water for the construction of the flushing and digging method, the degradable plastic film and the broken stone 9 geotextile blind ditch are arranged at the bottom, the water can be collected and filtered, the slurry is filtered through the soil body 16 and the blind ditch after standing in the cofferdam 11, the slurry flows to the water ditch 3 from the drain pipe and then flows to the sedimentation tank 13 from the water ditch 3, the water after sedimentation is supplied for water jetting, flushing and circular use, the water resource consumption can be reduced, the water resource utilization rate can be improved, the environment pollution caused by the slurry can be avoided, the influence of flushing and digging of lake ripples and artificial hills on the surrounding environment can be reduced, the water can be saved in the construction process of the lake ripples, and the environment can be protected. In addition, through setting up degradable plastic film and degradable plastics drain pipe, new and old soil body inlays each other admittedly and forms whole, has good anti slippage ability.

Referring to fig. 2 to 6, in an embodiment of the present invention, a system for treating slurry and circulating water for excavation construction is further provided, including a blind ditch, a ditch 3, a grid 4, a first membrane 5, a cofferdam 11, a second membrane 12, and a sedimentation tank 13.

Wherein, the blind ditch and the ditch 3 are arranged in the soil piling area and are communicated with each other. The blind ditches comprise a main blind ditch 1 extending along a first direction X and a branch blind ditch 2 extending along a second direction Y which are communicated with each other. The slopes of the main blind ditch 1 and the branch blind ditches 2 enable liquid to flow from the branch blind ditches 2 to the main blind ditch 1 and then to the water ditch 3. A plurality of grids 4 are formed by dividing the main blind ditches 1 and the branch blind ditches 2 in the mound area. A first membrane 5 is laid within the blind trench and the grid 4. The first film 5 is a degradable plastic film. And a degradable plastic drain pipe, a first layer of geotextile, broken stones 9 and a second layer of geotextile are sequentially laid above the first film 5 in the blind ditch. And the pipe wall of the drain pipe is provided with a plurality of through holes through which water flows. The diameter of the water discharge pipe of the main blind ditch 1 is larger than that of the branch blind ditch 2. The soil sack cofferdam 11 is arranged around the mound area. The water channel 3 surrounds the cofferdam 11. A second film 12 is laid inside said cofferdam 11. The second film 12 is a degradable plastic film, and the second film 12 is pressed on the first film 5 at the bottom of the cofferdam 11. The sedimentation tank 13 is arranged outside the cofferdam 11 and communicated with the ditch 3.

The system of the present embodiment is formed by the steps in the method, and for a detailed description of relevant contents, reference is made to the method section above, which is not described herein again.

In this embodiment, the system embodiment corresponds to the method embodiment, which can solve the technical problem solved by the method embodiment, and accordingly achieve the technical effect of the method embodiment, and detailed descriptions of this application are omitted here.

It should be noted that, in the description of the present specification, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no order is present therebetween, and no indication or suggestion of relative importance is to be made. In addition, in the description of the present specification, the meaning of "a plurality" is two or more unless otherwise specified.

Any numerical value recited herein includes all values from the lower value to the upper value, in increments of one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited and all possible combinations of numerical values between the lowest value and the highest value enumerated are to be considered to be explicitly recited in this specification in a similar manner.

Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the indicated endpoints.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of 8230comprises the elements, components or steps identified and other elements, components or steps which do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed subject matter.

Claims (10)

1. A method for treating slurry and circulating water for construction by a flushing and excavating method is characterized by comprising the following steps:

clearing a soil-piled area;

excavating communicated blind ditches and water ditches in the soil-piled area; the blind ditches comprise communicated main-path blind ditches extending along a first direction and branch-path blind ditches extending along a second direction, and the first direction is perpendicular to the second direction; the main road blind ditches and the branch road blind ditches divide a plurality of grids in the mound area; the slopes of the main blind ditch and the branch blind ditches enable liquid to flow from the branch blind ditches to the main blind ditches and then to the water ditches;

laying a first film in the blind ditches and the grids; the first film is a degradable plastic film;

sequentially laying a degradable plastic drain pipe, a first layer of geotextile, broken stones and a second layer of geotextile above the first film in the blind ditch; the wall of the drain pipe is provided with a plurality of through holes for water to flow through; the diameter of the drain pipe of the main path blind drain is larger than that of the drain pipe of the branch path blind drain;

arranging soil bag cofferdams around the soil piling area; the ditch surrounds the cofferdam;

laying a second film on the inner side of the cofferdam; the second film is a degradable plastic film and is pressed above the first film at the bottom of the cofferdam;

a sedimentation tank communicated with the ditch is arranged outside the cofferdam;

pumping and conveying slurry formed after water jet excavation into the cofferdam, filtering the slurry through a soil body and the blind ditch after the slurry is stood, enabling the slurry to flow to the ditch from the drain pipe, then flowing to the sedimentation tank from the ditch, and supplying the settled water to the water jet excavation for recycling.

2. The method for mud treatment and water circulation for excavation according to claim 1, wherein the step of excavating the interconnected blind ditches and ditches in the mound area includes a step of making the bottom of the blind ditches have a gradient of not less than 2%, and a step of making the middle of the grid higher and lower than the periphery of the grid, and making the gradient of the grid not less than 2%.

3. The method for mud treatment and water circulation in excavation according to claim 1, wherein in the step of excavating interconnected blind ditches and ditches in the mound area, the distance between the adjacent branch blind ditches is not more than 4m, and the distance between the adjacent main road blind ditches is not more than 10m; the branch blind ditch is provided with bidirectional drainage, two ends of the branch blind ditch are connected with the main road blind ditch, the main road blind ditch is provided with a water flowing direction according to the position of the sedimentation tank, and the main road blind ditch is connected with the water ditch.

4. The method for slurry treatment and water circulation for construction by excavation according to claim 1, wherein in the step of excavating the interconnected blind ditches and ditches in the mound area, the lateral blind ditches have a sectional excavation size of 200mm x 400mm, and the main blind ditches have a sectional excavation size of 500mm x 700mm; the diameter of the drain pipe of the main path blind ditch is 500mm, and the diameter of the drain pipe of the branch path blind ditch is 200mm.

5. The method for mud treatment and water circulation in excavation according to claim 1, wherein in the step of laying a first film in the blind trench and the grid, the first film at a high position is pressed against the first film at a low position, and the overlapping size of two adjacent first films is not less than 100mm, and the two adjacent first films are adhered by glue.

6. The method for mud treatment and water circulation for construction by the method of dredging as claimed in claim 1, wherein in the step of laying a degradable plastic drain pipe, a first geotextile, crushed stones and a second geotextile in sequence above the first membrane in the blind ditch, a medium coarse sand cushion layer is filled on the first membrane in the blind ditch before laying the drain pipe; the gradient of the drain pipe is equal to the gradient of the blind ditch.

7. The method of mud treatment and water circulation for excavation according to claim 1, wherein the first membrane is turned up at least 500mm around the mound area; the second film extends inwards for at least 500mm at the bottom of the cofferdam, and the second film is higher than the top of the cofferdam by at least 500mm and is folded to the top surface of the cofferdam.

8. The method of claim 1, wherein the degradation time of the first membrane, the second membrane and the drain pipe is not shorter than the construction time of the method of slurry treatment and water circulation for excavation.

9. The method for mud treatment and water circulation for construction by the method of claim 1, wherein the mud in the cofferdam is settled and then separated out, the soil body is compacted and then an upper layer of cofferdam is arranged, the upper layer of cofferdam is folded inwards in comparison with the lower layer of cofferdam according to the designed mound gradient, and a third film is arranged at the inner side of the upper layer of cofferdam; the third film is a degradable plastic film, and the bottom of the upper cofferdam layer is covered above the second film; the third film extends inwards for at least 500mm from the bottom of the upper layer of cofferdam, and the top of the third film above the upper layer of cofferdam is at least 500mm higher than the top of the upper layer of cofferdam and is folded to the top surface of the upper layer of cofferdam.

10. A system for slurry treatment and water circulation for use in excavation construction, comprising:

the blind ditch and the ditch are communicated and arranged in the soil piling area; the blind ditches comprise communicated main-path blind ditches extending along a first direction and branch-path blind ditches extending along a second direction, and the first direction is perpendicular to the second direction; the slopes of the main blind ditch and the branch blind ditches enable liquid to flow from the branch blind ditches to the main blind ditches and then to the water ditches;

a plurality of grids divided by the main road blind ditches and the branch road blind ditches in the mound area;

a first membrane laid within the blind trench and the grid; the first film is a degradable plastic film; a degradable plastic drain pipe, a first layer of geotextile, broken stones and a second layer of geotextile are sequentially laid above the first film in the blind ditch; the wall of the drain pipe is provided with a plurality of through holes for water to flow through; the diameter of the drain pipe of the main path blind ditch is larger than that of the branch path blind ditch;

a soil bag cofferdam arranged around the soil piling area; the ditch surrounds the cofferdam;

a second film laid on the inner side of the cofferdam; the second film is a degradable plastic film and is pressed above the first film at the bottom of the cofferdam;

and the sedimentation tank is arranged outside the cofferdam and communicated with the ditch.

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