CN110146332A - A kind of groundwater monitoring well device and groundwater sampling method - Google Patents
A kind of groundwater monitoring well device and groundwater sampling method Download PDFInfo
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- CN110146332A CN110146332A CN201910363302.8A CN201910363302A CN110146332A CN 110146332 A CN110146332 A CN 110146332A CN 201910363302 A CN201910363302 A CN 201910363302A CN 110146332 A CN110146332 A CN 110146332A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
A kind of groundwater monitoring well device according to the present invention and groundwater sampling method, groundwater monitoring well device, including interconnected multiple tubular well casings, N number of filter pipe, the upper and lower ends of well casing are evenly arranged with multiple rectangular clapboards along axis to inner wall, well casing inner cylinder space is separated into N number of closing and mutually disconnected first sector channel, filter pipe includes tube wall top and tube wall lower part, at least one layer is wrapped in the filter layer of tube wall lower part, and seal ring, the upper and lower ends of tube body are evenly arranged with multiple rectangular clapboards along axis to inner wall, the intracorporal cylindrical space of pipe is separated into N number of closing and mutually disconnected second segment channel, the corresponding tube wall lower part in one the second segment channel is provided with multiple through-holes and constitutes drainage segment, the bottom of the drainage segment is closed, drainage segment with thereon Portion corresponding first segment channel, the second segment channel are connections, and seal ring is made of the material of water-swellable.
Description
Technical field
The invention belongs to environment protection fields, and in particular to a kind of individual well multi-layer Underground Water for contaminated site groundwater monitoring
Monitoring well device and groundwater sampling method.
Background technique
Currently, China mostly uses greatly building a bite underground to the sampling of underground water when carrying out contaminated site environmental survey
Water monitoring well takes the mode of a mixed sample or the underground water of some destination layer, it is difficult to accurately know that place is different deep
The pollution situation of underground water at degree, the accurate determination for repairing the scale of construction to polluted underground water creates great difficulties, to influence to repair
The formulation of technical solution and the accuracy of repairing construction.It therefore, can be using same for accurate measurements when site investigation
The mode of the groundwater monitoring well of several mouthfuls of different depths is set at position, but the quantity of this method well is more, shaft building efficiency is lower,
High investment.To save cost, the paid monitoring well technology for using the multiple channels of a bite individual well of hydrogeological department, authorization public affairs
207,079,559 207079560 U of U, CN of announcement CN, CN 207079561U, 207143907 U of CN etc. disclose such
Technology, well casing is one, but has opened 2-4 channel in different layers position, can monitor the underground water of different layers position, way is general
It is to place well casing at well in place sampled point drilling, then filtering material is filled between the filter pipe of well casing and the borehole wall, in well casing
Sealing layer is filled between the borehole wall, wellhead protecting lid is finally installed, and being completed shaft building, generally being retained use for a long time once built up.
These public technologies are mainly used for survey for the purpose of locating hydrogeological resources, rarely have for the investigation of contaminated site groundwater environment；For polluting
The requirement for meeting the investigation of contaminated site groundwater environment is tended not to when place, is mainly reflected in following several respects.First is that traditional
Survey for the purpose of locating hydrogeological resources main purpose is water resources problems, less to water pollutant concern, does not fully consider the micro- of contaminated site
The features such as property seen, pollution, unevenness and pollutant complex environment process, the design of filter pipe are directed to different pollutants
Sampling, pumping and washing process etc. be unable to satisfy the requirement of environmental survey and reparation.Second is that contaminated site environmental survey often workload
It is larger, the duration is shorter, traditional well building method technique is relative complex, and shaft building efficiency is lower, need to additionally consume the materials such as filtrate, shaft building
It is at high cost.Third is that pollution plot often faces subsequent development utilization, monitoring well is difficult to remove after the completion of traditional shaft building, stays in for a long time
Original place, recycling subsequent to place cause great inconvenience.
Summary of the invention
To sum up, lack very much accurate, high-efficient, the at low cost groundwater sampling in space in the investigation of current contamination space enrironment
Monitoring well technology and application method.To solve this problem, the present invention proposes a kind of accurate monitoring pollution place different depth underground
The individual well multilayer monitoring well and application method of water, fully considered contaminated site earth formation, contamination characteristics, shaft building efficiency and
The factors such as cost can accurately know place different target layer underground water pollution situation, can be the contaminated site groundwater remediation scale of construction
Accurate quantitative analysis provides support.
The present invention provides a kind of groundwater monitoring well device, is arranged in underground water sampled well, for N number of different depth
The underground water of formation at target locations sampled, have the feature that, including interconnected multiple tubular well casings, N number of
Filter pipe, wherein the upper and lower ends of well casing are evenly arranged with multiple rectangular clapboards along axis to inner wall, and well casing inner cylinder is empty
Between be separated into N number of closing and mutually disconnected first sector channel, filter pipe have the tube body of tubular, there is tube wall, including pipe
Wall top and tube wall lower part, at least one layer are wrapped in the filter layer and seal ring of tube wall lower part, are circumferentially positioned on tube wall
The upper and lower ends in portion, tube body are evenly arranged with multiple rectangular clapboards along axis to inner wall, will manage intracorporal cylindrical space and separate
At N number of closing and mutual disconnected second segment channel, the shape size in the second segment channel and the first segment are logical
Road is identical, and the corresponding tube wall lower part in a second segment channel is provided with multiple through-holes and constitutes drainage segment, drainage fan
The bottom of body be it is closed, in the corresponding formation at target locations that N number of different depth is set of N number of filter pipe, the well of connection
Pipe and filter pipe in, the position in the second segment channel is overlapped and is connected to the first segment channel position, drainage segment and
Upper part corresponding first segment channel, the second segment channel are connections, and seal ring uses the material system of water-swellable
At.
It in groundwater monitoring well device provided by the invention, can also have the following features: wherein, the center of through-hole
The central axis of line and tube body, alternatively, the angle in downward direction of the center line of through-hole and body central line is acute angle, or
The angle of person, the upward direction of the center line and body central line of through-hole are acute angle.
In addition, can also have the following features: wherein, tube wall in groundwater monitoring well device provided by the invention
Lower part includes upper wall portion, wall section and lower wall portion from top to bottom, and multiple through-holes include that upper wall portion is respectively set
On upper through-hole, setting wall section on middle through-hole and setting lower wall portion on lower through-hole, the center line of upper through-hole with
The angle in downward direction of body central line is acute angle, and the center line of middle through-hole is vertical with body central line, the center of lower through-hole
The angle of the upward direction of line and body central line is acute angle.
In addition, can also have the following features: wherein in groundwater monitoring well device provided by the invention, filtering
Layer has multilayer, and multiple layers of filters filtering hole shape having the same, the filtering hole site in adjacent two layers filter layer is to interlock
It is arranged, alternatively, multiple layers of filters is made of the filter layer of multiple and different filtering hole shapes, there are different filtering hole shapes
Multiple filter layers be it is arranged in a crossed manner, filter layer using low absorbability stainless steel or high-molecular organic material be made.
In addition, in groundwater monitoring well device provided by the invention, it is characterised in that: further include that there is reticular structure
Anti- blocking layer, is circumferentially positioned at tube wall lower part and between tube wall and filter layer, is used to support filter layer and prevents through-hole from blocking.
A kind of construction of groundwater monitoring well device and groundwater sampling method, for the formation at target locations to multiple and different depth
Underground water sampled, which comprises the following steps:
Step 1, in selected sampling point position, the drilling operation of sampled well is carried out；
Step 2, groundwater monitoring well device is assembled, is led in the well casing of the groundwater monitoring well device with multiple cavities
Road；
Step 3, groundwater monitoring well device is placed in the sampled well being drilled；
Step 4, according to the depth in channel, well-flushing operation is carried out to multiple channels respectively according to order from shallow to deep；
Step 5, groundwater sampling is carried out in the channel in multiple groundwater monitoring well devices respectively.
In groundwater monitoring well device provided by the invention construction and application method, it can also have the following features:
Wherein, in step 2, the hollow space of the well casing of groundwater monitoring well device is by using the axle center of well casing as vertex, multiple in radiation
The plate body of shape is separated into multiple cavities channel, and each cavity lane is not connected and is parallel to well casing axis direction, each passage length
Difference corresponds respectively to formation at target locations different in place, is equipped with drainage section in corresponding formation at target locations, each cavity lane
Drainage section bottom is sealing.
In addition, can also have such in groundwater monitoring well device provided by the invention construction and application method
Feature: where in step 4, the water of well-flushing is groundwater level in channel to 3-5 times of the volume in shaft bottom.
In addition, can also have such in groundwater monitoring well device provided by the invention construction and application method
Feature: where in step 5, when measuring dissolubility pollutant, water intaking position is located at the water surface in channel and the interposition of bottom
It sets, when containing lightweight nonaqueous phase liquid in water, water intaking position is located at the water surface site in channel, non-aqueous when containing heavy in water
When phase liquid, water intaking position is located at the water bottom location in channel.
In addition, can also have such in groundwater monitoring well device provided by the invention construction and application method
Feature: where when well casing diameter is 8cm~20cm, cavity lane quantity is 2~12.
The action and effect of invention
Related groundwater monitoring well device and application method according to the present invention, using groundwater monitoring well of the invention
Device has the advantages that shaft building is high-efficient, precisely samples to destination layer polluted underground water.
Pumping and washing process of the invention creatively proposes to overcome conventionally employed pH value, temperature using well-flushing water as foundation
The shortcomings that parameter stabilities such as degree, conductivity, dissolved oxygen, oxidation-reduction potential are foundation.
The method of sampling for different pollutant characteristics of the invention, in destination layer have target contaminant feature
Underground water the advantages of precisely sampling.
Well casing of the invention is recyclable to be recycled, and therefore, has outstanding advantages of cost efficiency, environment friendly.
Detailed description of the invention
Fig. 1 is stratum and groundwater monitoring well device diagrammatic cross-section in the embodiment of the present invention；
Fig. 2 is filter pipe tube body schematic diagram in the embodiment of the present invention；
Fig. 3 is a kind of diagrammatic cross-section of through-hole in the embodiment of the present invention；
Fig. 4 is a kind of diagrammatic cross-section of through-hole in the embodiment of the present invention；
Fig. 5 is filter layer schematic diagram in the embodiment of the present invention；And
Fig. 6 is anti-blocking layer schematic diagram in the embodiment of the present invention.
Specific embodiment
It is real below in order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention
Example combination attached drawing is applied to be specifically addressed groundwater monitoring well device of the invention and application method.
Embodiment one
It is influenced for certain contaminated site groundwater environment that may be present, groundwater environment investigation need to be carried out.According to pollution
The characteristic in place infers that the possible major pollutants of underground water include light non-aqueous phase liquids, dense non-aqueous phase liquids etc..According to place
Geological prospecting is as a result, as shown in Figure 1, contaminated site stratum is followed successively by miscellaneous fill (destination layer 1), grit layer (target from top to bottom
Layer 2) cohesive soil (destination layer 3), mealiness clay (destination layer 4) and silt (destination layer 5).
Groundwater monitoring well device in the present embodiment is arranged in underground water sampled well, for N number of different depth
The underground water of formation at target locations is sampled.
As shown in Figure 1, groundwater monitoring well device include interconnected multiple tubular 5 filter pipes 11,5 only
Water ring 10, wellhead protecting lid, sampling well lid (being not drawn into figure).
In different formation at target locations, well casing connection 11 mode of filter pipe can be used.
In the corresponding formation at target locations that 5 different depths are set of 5 filter pipes 11 of groundwater monitoring well device,
Different depth in each filter pipe 11 corresponding different soil layer or same soil layer, when destination layer soil thickness is not more than 5 meters,
11 length of filter pipe is no more than destination layer overall thickness.
When target layer thickness is greater than 5 meters, multiple filter pipes 11 can be set in this layer, 11 length of filter pipe no more than
3 meters.
When containing light non-aqueous phase liquids in place, the upper end of filter pipe 11 should be higher than the water level of underground water, underground water
In light non-aqueous phase liquids (LNAPL) surface of underground water in filter pipe 11 can be floated on, convenient for collected.
When containing dense non-aqueous phase liquids (DNAPL) in place, the bottom of filter pipe 11 should be located at the top of impermeable stratum
Portion, the dense non-aqueous phase liquids in underground water can sink to the bottom of underground water in filter pipe, convenient for collected.
The length of filter pipe 11, can be between 0.5 meter -5 meters according to the precision of site investigation.Filter pipe is not generally across two
A or several different target water-bearing layers, especially in probe, the not cross-layer of filter pipe 11.
Well casing is cylindrical, and outer diameter is less than the internal diameter of underground water sampled well, and the upper and lower ends of well casing are along axis to inner wall
Multiple rectangular clapboards are evenly arranged with, well casing inner cylinder space is separated into N number of closing and mutually disconnected first sector is logical
Road.
Two adjacent well casing connection types are using being threadedly coupled or snapping connection, and well casing is using in PPR, PVC, stainless steel
Any one material is made, and well casing internal diameter is 80mm-20mm, and well casing single-unit length is 1000mm-3000mm, well casing and well casing it
Between using be threadedly coupled.Well casing single-unit length is 3 meters, and well casing outer diameter is 200mm.
When a threaded connection is used, the upper end of well casing is provided with internal screw thread, the reduced diameter of lower end junction and is provided with
Match the external screw thread of the internal screw thread.
Alternatively, it is also possible to connected using connector two adjacent well casings, the adjacent well casing and filter pipe 11 of connection or
Connect adjacent filter pipe 11 and filter pipe 11.
The both ends of well casing are respectively arranged with external screw thread, and connector is annular in shape, are provided in matching with external screw thread in ring
Screw thread.
Well casing diameter is 8cm to 20cm, preferably 8cm to 16cm；Cavity lane quantity is 2~12, general section face
Product can be not of uniform size, can also be equal in magnitude.Under the conditions of each channel sized is impartial, when well casing diameter is 8cm, number of channels is not
More than 4；When well casing diameter is 9~10cm, number of channels is no more than 6；When well casing diameter is 11cm, number of channels is no more than
7；When well casing diameter is 12cm, number of channels is no more than 8；When well casing diameter is 13cm, number of channels is no more than 9；Well
When pipe diameter is 14cm, number of channels is no more than 10；When well casing diameter is 15cm, number of channels is no more than 11；Well casing diameter
When for 16cm, number of channels is no more than 12.Preferred scheme is that well casing diameter is 14~16cm, and number of channels is 3-5.
It is such that the optimality that ensure that each channel cross-sectional area is set, it prevents that obstacle is had some setbacks or met in well-flushing and sampling.
When each channel cross-section is unequal, cross sectional area from big to small corresponding monitoring objective layer depth from depth to
Shallowly.
In embodiment, the area of section in each channel is identical.
In embodiment, filter pipe 11 and filter pipe 11 are connected through a screw thread assembling, are placed under sampled well together, to improve
Shaft building efficiency, wellhead protecting lid are arranged on 11 mouthfuls of uppermost filter pipe, and sampling well lid is annularly arranged on the ground, drainage
Pipe 11 is passed through from sampling well lid, and sampling well lid is used to block the gap between filter pipe 11 and the borehole wall of sampled well.
In the corresponding formation at target locations that 5 different depths are arranged in of 5 filter pipes 11, filter pipe 11 includes tubular
Tube body 3, at least one layer of filter layer, anti-blocking layer 5 and seal ring 10.
Tube body 3 is the tube body of tubular, has tube wall, including tube wall top and tube wall lower part,
The upper and lower ends of tube body 3 are evenly arranged with multiple rectangular clapboards along axis to inner wall, and it is empty will to manage intracorporal cylindrical body
Between be separated into 5 closing and mutually disconnected second segment channel, the shape size in the second segment channel with first fan
Body channel is identical.
The corresponding tube wall lower part in one the second segment channel is provided with multiple through-holes and constitutes drainage segment, drainage fan
The bottom of body is closed.
In the well casing 7 and filter pipe 11 of connection, the position in the second segment channel is overlapped with the first segment channel position
And be connected to, drainage segment the first segment channel corresponding with upper part, the second segment channel are connections.
As shown in Fig. 2, the upper end of tube body 3 is provided with internal screw thread 1, the drainage sector body position setting on the tube wall of tube body 3
There are multiple through-holes 2, the section of through-hole 2 can be any one in round, ellipse and strip.
The direction of through-hole 2 is designed according to pollutant different in underground water, a kind of situation is the center line and pipe of through-hole 2
The central axis of body 3 passes through the central axis of the water (flow) direction of through-hole 2 and tube body 3 in this way.
Alternatively, the angle in downward direction of the center line of through-hole 2 and 3 center line of tube body is acute angle.
When water (flow) direction A passes through through-hole 2 as shown in Figure 3, suitable for the underground water containing oils, because of the substance of oil-containing
It is to be easy to float, is easy to pass through this kind of hole.
Alternatively, the angle of the upward direction of the center line of through-hole 2 and 3 center line of tube body is acute angle.
When water (flow) direction B passes through through-hole 2 as shown in Figure 4, it is logical by this kind to be suitable for dense non-aqueous phase liquids pollutant
Hole.
When the acute angle is 45 degree, water flow passes through with preferable effect.
Further, through-hole 2 is in arc-shaped at the edge of tube wall, i.e., the junction of through-hole 2 and tube wall is in arc-shaped, in this way
Just do not allow it is easier that the suspended matter in underground water deposits in junction.
The material of tube body 3 is PPR, PVC, stainless steel, any one in steel, internal diameter 80mm-160mm, and 3 single-unit of tube body is long
Degree is 100mm-4000mm, and tube body 3 is connected through a screw thread with well casing 7.
In the present embodiment, tube body 3 is cylindrical, is made of PVC material, the section size of tube body 3 and the section of well casing 7
Size is identical, and the center line of through-hole 2 and the central axis of tube body 3, the section of through-hole 2 is elongated, in embodiment, according to pipe
Diameter and water intaking layer hydrogeologic condition it is horizontally disposed, which is processed vertically on tube body 3, strip slot it
Between it is spaced and parallel, be staggered.The length of strip slot is 30mm-120mm, width 0.15mm-3mm, spacing 3mm-12mm.
At least one layer of filter layer 4 as shown in Figure 5 is wrapped on the tube wall of tube body 3, and the size of filter hole is small in filter layer 4
In the size of through-hole.
Wherein, filter layer 4 has multilayer.
The filtering hole shape having the same of multiple layers of filters 4, the filtering hole site in adjacent two layers filter layer 4 is staggeredly to set
It sets.
Alternatively, multiple layers of filters 4 is made of the filter layer 4 of multiple and different filtering hole shapes, there are different filter hole
Multiple filter layers 4 of shape are arranged in a crossed manner.
It is required according to water intaking layer hydrogeology and water intaking, filter layer 4 can have 5-20 layers.Filter layer 4 uses low absorbability
Stainless steel or high-molecular organic material be made.
In embodiment, filter layer 4 is wrapped up by the identical filter cloth of multiple filtration hole shape, or by multiple filtration hole shape
Different filter cloth is wrapped up, and the choice of material adsorptivity of filter cloth is poor and the preferable high-molecular organic material of stability, such as
Terylene, polypropylene fibre, polyamide fibre (nylon), polyvinyl, polyethylene, composite fibre, any one in resinae.
The shape of filter hole can be in filter cloth for shapes, the shapes of the filter hole of each layer filter cloth such as rectangle, diamond shapes
Identical, the filtering hole site in adjacent two layers filter layer 4 is staggered.
Alternatively, what the shape of the filter hole of each layer filter cloth can also be different, multiple filterings with different filtering hole shapes
Layer 4 is arranged in a crossed manner.
The available smaller filter hole of filter layer 4 after multiple-layer stacked can more effectively play filtering and make
With.
In embodiment, the filter hole of filter cloth is divided into carse, medium and small three kinds of specifications, and mass area ratio is respectively 100g/
m2、450g/m2、800g/m2, effective aperture is respectively 0.2mm, 0.14mm, 0.07mm, and in the room temperature of underground water, (15-17 is taken the photograph
Family name's degree) under, filter cloth material does not dissolve and organic pollutant, and acid and alkali-resistance.
Therefore, in filter layer 4 filter hole size be less than through-hole 2 size, i.e., it is maximum in 4 effective aperture of filter layer
Size is less than the smallest size in through-hole 2.
To avoid through-hole 2 from silting up, anti-blocking layer 5 is provided between tube body 3 and filter layer 4.
Anti- blocking layer 5 with reticular structure, is circumferentially positioned on tube wall and between tube wall and filter layer 4, for branch
Support filter layer 4 simultaneously prevents through-hole from blocking.
The anti-blocking layer 5 has support and anti-blocking effect is isolated, as shown in fig. 6, being provided with multiple through-holes in anti-blocking layer 5.It is real
It applies in example, the anti-blocking layer 5 made of one layer of plastic wire separates between 3 outer wall of filter layer 4 and tube body.Plastic wire length is 100mm-
4000mm, with a thickness of 2mm-5mm, plastic wire mesh is diamond shaped.
At least one seal ring 10 is circumferentially positioned at tube wall top, between well casing 7 and the borehole wall of sampled well.
As shown in Figure 1, seal ring 10 is arranged on filter pipe 11, seal ring 10 is made of the material of water-swellable, is met
It is rubber or swelled ground that water, which expands material,.Seal ring 10 is fixed on the outer wall of well casing 7 before well casing places monitoring well.Rubber
The water-swellable seal ring of material can be tied tight outside it with lock ring, and the water-swellable seal ring of swelled ground material need to put into bullet
The permeable string bag of power, is tied tight outside the string bag with lock ring.Water-swellable seal ring circumferential length is 5mm-500mm, with a thickness of
10mm-30mm。
In embodiment, seal ring 10 is made of the rubber material of water-swellable, wherein the coefficient of expansion of rubber material is
1.5-3, the coefficient of expansion of swelled ground are 0.5-1.5.
The seal ring 10 of water-swellable is close with the sealing layer effect in traditional method of well construction, expands, rises after meeting water
To the effect of sealing.The gap between well casing 7 and the borehole wall of sampled well, 10 lower section of sealing part are blocked after 10 water-swellable of sealing part
Underground water flowed into tube body 3 outside tube body 3 by filter layer 4.
10 mounting means of seal ring is easy, can effectively improve shaft building efficiency.In addition, meeting after the dehydration of water-swellable seal ring 10
Slowly shrink, monitoring well after use, conducive to retrieving it, can be recycled after processing, saved cost.
A kind of groundwater sampling method, comprising the following steps:
According to underground water sampled field feature infers the underground water main pollution that may be present on underground water sampled field ground
Object；
According to underground water sampled field geological prospecting is as a result, obtain the distribution of strata situation in groundwater sampling place；
The case where according to major pollutants and target monitoring layer, determine sampled point；
The position of selected sampled well, carries out the drilling operation of sampled well；
The position of selected underground water inspection sampled well, chooses suitable boring method according to soil layer geological structure, starts to sample
Well drilling operation, the aperture of sampled well are greater than the sum of the thickness of well casing outer diameter and 2 seal rings；
Complete the drilling operation of sampling wellhole；
Groundwater monitoring well device is assembled, there is multiple cavities channel in the well casing of the groundwater monitoring well device；
The hollow space of the well casing of groundwater monitoring well device is by using the axle center of well casing as vertex, multiple plates radially
Body is separated into multiple cavities channel, and each cavity lane is not connected and is parallel to well casing axis direction, and each passage length is different, point
Formation at target locations that Dui Yingyu be not different in place, is equipped with drainage section, the drainage section of each cavity lane in corresponding formation at target locations
Bottom is sealing；
Groundwater monitoring well device is placed in the sampled well being drilled；
Wellhead protecting lid is installed, the rapid build of groundwater monitoring well device is completed；
According to the depth in channel, well-flushing operation is carried out to multiple channels respectively according to order from shallow to deep；
Well-flushing carries out well-flushing by order from shallow to deep according to the depth in each channel in groundwater monitoring well device；
In view of the heterogeneity of contaminated site pollutant, well-flushing water should not be too big, and the water of general well-flushing is well-flushing
Water be the groundwater level in channel to 3-5 times of volume of shaft bottom, it is not recommended that using pH value, temperature, conductivity, dissolution
The parameter stabilities such as oxygen, oxidation-reduction potential are foundation；
Groundwater sampling is carried out in the channel in multiple groundwater monitoring well devices respectively；
To different pollutants using the different method of samplings, when measuring dissolubility pollutant, water intaking position generally exists
The middle position in well water face and bottom；
When containing lightweight nonaqueous phase liquid in water, water intaking position should be in the water surface site in well；
When containing heavy nonaqueous phase liquid in water, water intaking position should be in the water bottom location in well.
Embodiment two
The present embodiment other structures are the same as example 1, and only the structural pipe wall of filter pipe is different from embodiment one.
In the present embodiment, tube wall includes upper wall portion, wall section and lower wall portion from top to bottom,
Multiple through-holes include the upper through-hole being respectively set in upper wall portion, the middle through-hole on setting wall section and setting
Lower through-hole on lower wall portion.
The center line of upper through-hole and the angle in downward direction of body central line are acute angle.
The center line of middle through-hole is vertical with body central line.
The angle of the upward direction of the center line and body central line of lower through-hole is acute angle.
Embodiment three
The present embodiment other structures are the same as example 1, and the installation site of seal ring is different from embodiment one.
In the present embodiment, seal ring is mounted on the link position that filter pipe is connected with other tube bodies.
The action and effect of embodiment
Groundwater monitoring well device and groundwater sampling method according to involved in the present embodiment, using underground of the invention
Water monitoring well device has the advantages that shaft building is high-efficient, precisely samples to destination layer polluted underground water.
Further, the pumping and washing process of the present embodiment creatively proposes to overcome tradition using well-flushing water as foundation
Use the shortcomings that parameter stabilities such as pH value, temperature, conductivity, dissolved oxygen, oxidation-reduction potential is foundations.
Further, the method for sampling for different pollutant characteristics of the present embodiment, in destination layer have mesh
The advantages of underground water of mark pollutant characteristic precisely samples.
Further, the bottom of underground water sampled well is arranged in the filter pipe of the present embodiment, for the ground to particular formation
Be lauched carry out water quality monitoring, there is filter pipe at least one layer to be wrapped in the filter layer on tube body, for filter mud particles and
Suspended matter has not only saved material and transport recruitment cost, but also very without filling filtering layer between filter pipe and the borehole wall
It has conveniently realized and the underground water well after using has been removed, do not influenced the work of place subsequent development.
Further, groundwater monitoring well device is connect using multiple well casings of modularization making with filter pipe, not only side
Civilian dress is matched and is installed, and well casing and filter pipe can be recycled in monitoring well retrieval after use through processing, have at
Outstanding advantages of this economy, environment friendly.
Further, well casing and sampling are blocked after the seal ring water-swellable between well casing and the borehole wall of sampled well is set
Gap between the borehole wall of well prevents the exchange of underground water between different target layer, needs from rather than traditional well building method
Quartz sand filtering layer is filled between well casing and the borehole wall, is enormously simplified shaft building program, is significantly improved shaft building efficiency.
So the sampling system for being sampled to contaminated site underground water of the invention can not only effectively simplify shaft building
Process promotes shaft building efficiency, shortens the shaft building time, and well casing and filter pipe remove in which can be convenient, and are recycled after processing
It uses.
Above embodiment is preferred case of the invention, the protection scope being not intended to limit the invention.
Claims (10)
1. a kind of underground water examines well logging apparatus, it is arranged in underground water sampled well, for the formation at target locations to N number of different depth
Underground water is sampled characterized by comprising
Interconnected multiple tubular well casings, N number of filter pipe,
Wherein, the upper and lower ends of the well casing are evenly arranged with multiple rectangular clapboards along axis to inner wall, by the well casing inner circle
Cylinder space is separated into N number of closing and mutually disconnected first sector channel,
The filter pipe includes
The tube body of tubular has tube wall, including tube wall top and tube wall lower part,
At least one layer is wrapped in the filter layer of the tube wall lower part, and
Seal ring is circumferentially positioned at the tube wall top,
The upper and lower ends of the tube body are evenly arranged with multiple rectangular clapboards along axis to inner wall, by the intracorporal cylindrical body of the pipe
Space be separated into it is N number of closing and mutually disconnected second segment channel, the shape size in the second segment channel with it is described
First segment channel is identical,
The corresponding tube wall lower part in one the second segment channel is provided with multiple through-holes and constitutes drainage segment, drainage fan
The bottom of body be it is closed,
In the corresponding formation at target locations that N number of different depth is set of the N number of filter pipe,
In the well casing and the filter pipe of connection, the position and first segment channel in second segment channel
Position is overlapped and is connected to, the drainage segment first segment channel corresponding with upper part, second segment
Channel is connection,
The seal ring is made of the material of water-swellable.
2. underground water according to claim 1 examines well logging apparatus, it is characterised in that:
Wherein, the central axis of the center line of the through-hole and the tube body,
Alternatively, the angle in downward direction of the center line of the through-hole and the body central line is acute angle,
Alternatively, the angle of the upward direction of the center line of the through-hole and the body central line is acute angle.
3. underground water according to claim 1 examines well logging apparatus, it is characterised in that:
Wherein, the tube wall lower part includes upper wall portion, wall section and lower wall portion from top to bottom,
Multiple through-holes include the upper through-hole being respectively set in the upper wall portion, the middle through-hole on the setting wall section
And the lower through-hole on the setting lower wall portion,
The angle in downward direction of the center line of the upper through-hole and the body central line is acute angle,
The center line of the middle through-hole is vertical with the body central line,
The angle of the upward direction of the center line of the lower through-hole and the body central line is acute angle.
4. underground water according to claim 1 examines well logging apparatus, it is characterised in that:
Wherein, the filter layer has multilayer,
The filtering hole shape having the same of filter layer described in multilayer, the filtering hole site in filter layer described in adjacent two layers are
It is staggered,
Alternatively, filter layer described in multilayer is made of the filter layer of multiple and different filtering hole shapes, there are different filter hole shapes
Multiple filter layers of shape be it is arranged in a crossed manner,
The filter layer is made of the stainless steel or high-molecular organic material of low absorbability.
5. underground water according to claim 1 examines well logging apparatus, it is characterised in that:
Further include the anti-blocking layer with reticular structure, is circumferentially positioned at the tube wall lower part and is located at the tube wall and the filtering
Between layer, it is used to support the filter layer and prevents the through-hole from blocking.
6. a kind of groundwater sampling method, the underground water for the formation at target locations to multiple and different depth sample, feature
It is, comprising the following steps:
Step 1, in selected sampling point position, the drilling operation of sampled well is carried out；
Step 2, groundwater monitoring well device is assembled, there is multiple cavities channel in the well casing of the groundwater monitoring well device；
Step 3, groundwater monitoring well device is placed in the sampled well being drilled；
Step 4, according to the depth in channel, well-flushing operation is carried out to multiple channels respectively according to order from shallow to deep；
Step 5, groundwater sampling is carried out in the channel in multiple groundwater monitoring well devices respectively.
7. underground water according to claim 6 examines well logging apparatus application method, it is characterised in that:
Wherein, in step 2, the hollow space of the well casing of the groundwater monitoring well device is top with the axle center of the well casing
Point, multiple plate bodys radially are separated into multiple cavities channel, and each cavity lane is not connected and is parallel to well casing axle center side
To, each passage length is different, corresponds respectively to formation at target locations different in place, it is equipped with drainage section in corresponding formation at target locations,
The drainage section bottom of each cavity lane is sealing.
8. underground water according to claim 1 examines well logging apparatus application method, it is characterised in that:
Wherein, in step 4, the water of well-flushing is groundwater level in the channel to 3-5 times of the volume in shaft bottom.
9. underground water according to claim 1 examines well logging apparatus application method, it is characterised in that:
Wherein, in step 5, when measuring dissolubility pollutant, water intaking position is located in the water surface and bottom in the channel
Between position,
When containing lightweight nonaqueous phase liquid in water, water intaking position is located at the water surface site in the channel,
When containing heavy nonaqueous phase liquid in water, water intaking position is located at the water bottom location in the channel.
10. underground water according to claim 7 examines well logging apparatus application method, it is characterised in that:
Wherein, when the well casing diameter is 8cm~20cm, cavity lane quantity is 2~12.
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| CN110671053A (en) * | 2019-09-29 | 2020-01-10 | 北京高能时代环境技术股份有限公司 | Well construction method for underground water layered sampling monitoring well |
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| CN114264507A (en) * | 2021-11-15 | 2022-04-01 | 中国科学院武汉岩土力学研究所 | Underground water sampling device, sampling method and installation method |
| EP4299850A1 (en) * | 2022-07-01 | 2024-01-03 | China Three Gorges Co., Ltd. | Groundwater pollutant control method and apparatus based on single-well pumping-injection |
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| CN110671053A (en) * | 2019-09-29 | 2020-01-10 | 北京高能时代环境技术股份有限公司 | Well construction method for underground water layered sampling monitoring well |
| CN110987525A (en) * | 2019-10-29 | 2020-04-10 | 上海市政工程设计研究总院（集团）有限公司 | Tube well device suitable for layered sampling of underground water in polluted site |
| CN111220416A (en) * | 2020-03-09 | 2020-06-02 | 生态环境部华南环境科学研究所 | Underground water monitoring device and method for preventing underground water cross contamination |
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| CN111852468A (en) * | 2020-08-07 | 2020-10-30 | 核工业北京化工冶金研究院 | Single-well multilayer sampling device for ground leaching well site |
| CN112730777A (en) * | 2020-12-22 | 2021-04-30 | 华南理工大学 | Method for rapidly detecting underground water on site |
| CN113588903A (en) * | 2021-07-28 | 2021-11-02 | 北京建工环境修复股份有限公司 | Underground water beam type monitoring well and well completion method |
| CN114264507A (en) * | 2021-11-15 | 2022-04-01 | 中国科学院武汉岩土力学研究所 | Underground water sampling device, sampling method and installation method |
| CN114264507B (en) * | 2021-11-15 | 2024-02-13 | 中国科学院武汉岩土力学研究所 | Groundwater sampling device, sampling method and installation method |
| CN114108747A (en) * | 2021-11-30 | 2022-03-01 | 国家能源投资集团有限责任公司 | Underground water pumping well pipe system |
| CN114108747B (en) * | 2021-11-30 | 2023-10-13 | 国家能源投资集团有限责任公司 | Underground pumping well pipe system |
| CN114152723A (en) * | 2021-12-01 | 2022-03-08 | 江苏省环境科学研究院 | Pre-installed underground water intelligent monitoring well device |
| EP4299850A1 (en) * | 2022-07-01 | 2024-01-03 | China Three Gorges Co., Ltd. | Groundwater pollutant control method and apparatus based on single-well pumping-injection |
| CN118255403A (en) * | 2024-03-12 | 2024-06-28 | 生态环境部土壤与农业农村生态环境监管技术中心 | Groundwater single-hole multi-layer extraction treatment repair equipment and method |
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