CN204877458U - Haplopore multilayer position groundwater monitoring system - Google Patents

Abstract

The utility model belongs to the technical field of groundwater monitoring, and particularly discloses a single-hole multi-level groundwater monitoring system. The single-hole multi-level groundwater monitoring system includes a cylindrical monitoring pipe body, and several monitoring channels are opened on the monitoring pipe body along the axial direction of the monitoring pipe body. The monitoring channels include a central monitoring channel and several For the outer monitoring channels, a monitoring hole group is respectively arranged on the wall of the monitoring tube body adjacent to each outer monitoring channel corresponding to the depth to be sampled. The single-hole multi-level groundwater monitoring system and method of the utility model realizes layered monitoring of multiple target aquifers in the same monitoring well hole, reduces the number of wells and the cost of maintenance and cleaning, and is not affected by the aquifer. Depth is limited, the depth of the well is large, and it can be installed in shallow groundwater monitoring wells of 30m-50m, and can also be installed in groundwater monitoring wells with a depth of hundreds of meters or even 300m.

Description

Single-hole multi-level groundwater monitoring system

(1) Technical field

The utility model belongs to the technical field of groundwater monitoring, in particular to a single-hole multi-level groundwater monitoring system.

(2) Background technology

Monitoring and mastering the dynamic change characteristics of groundwater is an important basis for scientifically evaluating groundwater resources, formulating reasonable development and utilization and effective protection measures, reducing and preventing groundwater pollution and related geological disasters. Traditional groundwater level and water quality monitoring is generally carried out by using a single wellbore facility for a single target aquifer or a mixed aquifer, using on-site monitoring, remote monitoring, and wellbore sampling. If you want to obtain the water level and water quality information of different aquifers at a certain location, you need to build multiple wells near a specific location, and adopt the sealing technique to form multiple groundwater monitoring wells at different aquifer levels. Water level and water quality monitoring is then carried out. For example, there are three aquifer groups distributed in a certain location, each with different groundwater levels. If you need to know the hydraulic connection and water quality information of groundwater in different aquifers, you first need to construct three depths according to the formation lithology and aquifer distribution. From shallow to deep wellbore, and then lay monitoring pipes in the wellbore, according to the principle that only one target aquifer is reserved in one wellbore, a groundwater monitoring system including three monitoring pipes is built by using sealing technology, so as to achieve monitoring of different target water cuts groundwater level and water quality objectives. This single-hole, single-layer groundwater monitoring wellbore facility and method not only covers a large area, but also requires a long construction time and large capital investment. In addition, it is difficult to truly reveal the aquifer due to the influence of drilling masonry precision and well sealing technology. The anisotropy and other complex characteristics of groundwater cannot correctly reflect the real-time dynamic change information of groundwater. For groundwater polluted areas, due to changes in aquifers in different regions, increased borehole spacing, and man-made drilling, it is difficult to capture the migration, transformation and diffusion of pollutants in different aquifers and under different lithological conditions.

With the requirements of groundwater resource evaluation, pollution investigation and precision groundwater monitoring technology, developed countries such as Europe, the United States, Canada, and Japan have developed rapidly in terms of groundwater monitoring facilities and technologies. At present, groundwater monitoring facilities and methods generally include single-hole mixed water monitoring, single-hole single-level monitoring and nested monitoring.

In the 1990s, the groundwater monitoring technology of one hole and multiple pipes appeared in my country, that is, multiple monitoring pipes of different lengths were laid to specific monitoring layers in one wellbore, and the groundwater was recovered by layering gravel and clay. , to achieve the purpose of stratified monitoring and stratified sampling in the same monitoring well. The monitoring well is also called "nested monitoring well" because a plurality of monitoring tubes are arranged in one well hole. Wherein, the monitoring pipe is made of PVC material. There are many technical problems in the use of this technology and facilities, which are specifically reflected in: when the well depth is too large and there are too many monitoring layers, the number of monitoring tubes required will be more, and the corresponding well diameter requirements will be greater, which will affect the drilling rig and drill bit. The requirements are also higher. In addition, as the number of monitoring layers increases, the more monitoring pipes are used, the more monitoring pipes need to be water-stopped, which not only increases the technical difficulty of layered well sealing, but also causes waste of materials.

In recent years, Canadian Solinst Corporation has developed various types of groundwater monitoring products, also known as CTM systems. This monitoring technology is mainly through improving the PVC monitoring pipe process, designing 3-7 monitoring channels in the same monitoring pipe, and each monitoring channel can monitor the groundwater of a target layer, so as to accurately obtain the groundwater in the same place and the same wellbore Layer water level and water quality information. However, this monitoring product is mainly used for layered monitoring of shallow groundwater. Due to the limitation of elastic parameters of materials, it is difficult to be used for monitoring deep groundwater. The monitoring depth is mainly between 20-50m. In addition, due to the small channel aperture of the monitoring pipe, the groundwater level measurement and water sample collection require the application of expensive special miniature water level gauges and samplers, and ordinary samplers and water level gauges cannot be used, which has become the biggest obstacle to popularization and application.

In view of the present situation and existing technical problems of groundwater monitoring facilities and technical methods at home and abroad, the purpose of this utility model is to provide a single-hole multi-level monitoring system for deep groundwater aquifers, so that the installation of the monitoring system is not affected by the depth of the monitoring well. to solve the monitoring problem of single hole and multi-level groundwater.

(3) Contents of the invention

In order to make up for the deficiencies of the prior art, the utility model provides a low-cost development, construction and management, small footprint, high compressive strength, monitoring multiple target aquifers in one monitoring well, and preventing the aquifers from being separated. It is a single-hole multi-level groundwater monitoring system that can generate hydraulic mixing, accurately grasp the migration and diffusion of pollutants in the aquifer, and can monitor the water level and water quality of deep underground aquifers.

The utility model is achieved through the following technical solutions:

The single-hole multi-level groundwater monitoring system includes a cylindrical monitoring pipe body, along the axial direction of the monitoring pipe body, there are several cylindrical monitoring channels that run through the upper and lower bottom surfaces of the monitoring pipe body. The channels include a central monitoring channel located in the center of the monitoring tube body and a number of outer monitoring channels evenly distributed around the central monitoring channel in the circumferential direction. The monitoring channels are not connected to each other; There is a set of monitoring holes on the pipe wall of the main body corresponding to the depth to be sampled. Each set of monitoring holes communicates with a corresponding outer monitoring channel. Each set of monitoring holes is wrapped with a filter net. An internal plug is installed in the outer monitoring channel 20cm below the monitoring hole group, and a port plug is provided at the bottom of each outer monitoring channel, and a groundwater plug is installed in the central monitoring channel and each outer monitoring channel. A sampler and a water level gauge, each groundwater sampler and water level gauge are connected with an external water quality analysis terminal.

The material of the monitoring tube body is polyvinyl chloride.

The aperture of the filter screen is 50-100 mesh.

Each monitoring hole group includes at least five monitoring holes, and the monitoring holes are vertically and equally spaced from top to bottom.

The diameter of the monitoring tube body is 75mm-100mm, the number of the outer monitoring channels is 6, and the inner diameter of each monitoring channel is 30mm.

Both the inner plug and the port plug are made of rubber material.

The beneficial effects of the utility model groundwater single-hole multi-level monitoring system are:

(1) The single-hole multi-level groundwater monitoring system of the utility model is designed with one hole and multiple layers, which realizes layered monitoring of multiple target aquifers in the same monitoring well, greatly reducing the number of wells and the cost of maintenance and cleaning , small footprint, low development, construction and management costs.

(2) The diameter of the monitoring pipe of the single-hole multi-level groundwater monitoring system of the utility model is relatively large, which is 75mm-100mm, so a plurality of monitoring channels with larger apertures can be opened on one monitoring pipe, and the inner diameter of a single monitoring channel reaches 30mm, which overcomes the defect that the traditional monitoring pipe can only use expensive special miniature groundwater samplers or water level gauges due to its small diameter. It integrates the relevant technical indicators required for the installation of monitoring instruments and can be installed in the monitoring channel. The ordinary groundwater sampler or water level gauge, after connecting with the external water quality analysis terminal, can realize real-time data transmission, so that multi-level groundwater can be monitored in a single monitoring well.

(3) The thickness of the partitions between the monitoring channels on the monitoring pipe of the single-hole multi-level groundwater monitoring system of the present invention is large, and it has good pressure resistance. The monitoring channel is hydraulically connected underwater, resulting in a series of layers between the aquifers; ② It forms a certain supporting effect on the outer wall of the monitoring tube to prevent the monitoring channel from being deformed after being squeezed, and has a certain effect on the monitoring tube that is slightly bent and deformed. Certain restorative effect. Therefore, the groundwater single-hole multi-level monitoring system of the utility model is not limited by the depth of the aquifer, and the depth of the well is large. It can be installed in a shallow groundwater monitoring well of 30m-50m, and can also be installed in a depth of hundreds of meters or even 300m. used in groundwater monitoring wells.

(4) The internal plugging plug and port plugging plug of the single-hole multi-level groundwater monitoring system of the utility model are made of rubber materials that are not easy to deform and rot. Each monitoring channel is relatively independent, ensuring that one monitoring channel can only collect The groundwater information of a layer prevents hydraulic mixing between various aquifers, accurately grasps the migration and diffusion of pollutants in the aquifer, and strictly controls that a monitoring channel cannot communicate with other aquifers except for the connection with the target aquifer. Contact to ensure the accuracy of monitoring data.

(5) The monitoring pipe of the single-hole multi-level groundwater monitoring system of the utility model is made of polyvinyl chloride material, which has good heat resistance, toughness and hardness, corrosion resistance, firmness and durability, and can be twisted during transportation for easy transportation , and can return to the original state after the external force is removed, it is not easy to deform, has high compressive strength, has strong resistance to the pressure around the monitoring well, can monitor the water level and quality of deep underground aquifers, and has a wide range of applications.

(4) Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic diagram of the structure of the single-hole multi-level groundwater monitoring system of the present invention installed in a monitoring well.

In the figure, 1 monitoring pipe body, 2 central monitoring channel, 3 outer monitoring channel, 4 monitoring hole group, 5 filter screen, 6 internal plugging plug, 7 port plugging plug, 8 groundwater sampler, 9 water level gauge, 10 water quality Analysis terminal.

(5) Specific implementation methods

In order to clearly illustrate the technical features of this solution, the utility model will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

As shown in Figures 1-2, the single-hole multi-level groundwater monitoring system of this embodiment includes a cylindrical monitoring pipe body 1, and several monitoring pipe bodies 1 are provided on the monitoring pipe body 1 along the axis direction of the monitoring pipe body 1. A cylindrical monitoring channel that runs through the upper and lower bottom surfaces of the monitoring tube body 1. The monitoring channel includes a central monitoring channel 2 located in the center of the monitoring tube body 1 and several outer monitoring channels evenly distributed around the central monitoring channel 2 in the circumferential direction 3. The monitoring channels are not connected to each other; a monitoring hole group 4 is provided on the wall of the monitoring tube body 1 adjacent to each outer monitoring channel 3 corresponding to the depth to be sampled, and each monitoring hole group 4 corresponds to it One of the outer monitoring channels 3 communicates with each other, and each monitoring hole group 4 is wrapped with a filter screen 5, and an inner plugging plug 6 is respectively arranged in the outer monitoring channel 3 corresponding to each monitoring hole group 4 below 20 cm. The bottom end of each outer monitoring channel 3 is provided with a port plug 7 respectively, and a groundwater sampler 8 and a water level gauge 9 are all arranged in the central monitoring channel 2 and each outer monitoring channel 3, and each groundwater sampler 8 and the water level gauge 9 are all connected to the external water quality analysis terminal 10.

The material of the monitoring tube body 1 is polyvinyl chloride.

The aperture of the filter screen 5 is 50-100 mesh.

Each monitoring hole group 4 includes at least five monitoring holes, and the monitoring holes are vertically and equally spaced from top to bottom.

The diameter of the monitoring tube body 1 is 75mm-100mm, the number of the outer monitoring channels 3 is 6, and the inner diameter of each monitoring channel is 30mm.

Both the inner plug 6 and the port plug 7 are made of rubber material.

The monitoring method based on the single-hole multi-level groundwater monitoring system of the present invention comprises the following steps:

(1) Drilling and monitoring boreholes:

After manually excavating the monitoring wellhead, use a drilling rig to drill from the Quaternary strata. The diameter of the drilling rig is D327mm. A cast iron pipe with a diameter of D217mm is used to protect the well wall and avoid the collapse of the monitoring well hole. A cast iron pipe inlet hole is set on the wall of the cast iron pipe corresponding to the target aquifer, and the groundwater of each target aquifer can pass through each cast iron pipe. The water inlet hole enters the cast iron pipe;

(2) Design and process the monitoring tube body:

According to the principle that each target aquifer corresponds to a central monitoring channel 2 or an outer monitoring channel 3, the monitoring pipe body 1 with a central monitoring channel 2 and several outer monitoring channels 3 is produced by mold processing, and then the monitoring pipe body Mark the position of each target aquifer on the pipe wall, and the deepest target aquifer corresponds to the central monitoring channel 2; The cutter drills the monitoring hole group 4 connected with the corresponding outer monitoring channel 3, and the number of monitoring holes included in each monitoring hole group 4 is determined according to the thickness of the target aquifer. When drilling an outer monitoring channel 3, it is necessary to Prevent breakdown of the partition between the outer monitoring channel 3 and other monitoring channels, avoid causing hydraulic cross-layers between different aquifers, and ensure that one monitoring channel only monitors one target aquifer;

(3) Block the monitoring tube body:

The bottom end of each outer monitoring channel 3 is sealed with a port plug 7, and the inner plug 6 of each outer monitoring channel 3 is fixed and sealed on the outer monitoring channel 3 20 cm below the monitoring hole group 4 of the outer monitoring channel 3 Inside;

(4) Install the monitoring pipe body to the monitoring well hole:

Wrap the filter screen 5 on each monitoring hole group 4, and install a groundwater sampler 8 and a water level gauge 9 respectively in the central monitoring channel 2 and each outer monitoring channel 3, connect each groundwater sampler 8 and a water level gauge by wire After the water level gauge 9 is connected to the external water quality analysis terminal 10, the monitoring pipe body 1 is lowered into the cast iron pipe of the monitoring well hole, and the cavity between the cast iron pipe and the monitoring pipe body is sealed in layers so that each target contains water The groundwater in the upper layer enters the corresponding monitoring channel;

(5) Obtain the water quality and water level information of the target aquifer:

The data transmitted by each water level meter 9 to the ground is the water level information of each target aquifer. After the groundwater sampler 8 of each groundwater sampler 8 takes out the groundwater of each target aquifer and sends it to the ground, the water quality analysis can be performed through the water quality analysis terminal 10 to obtain water quality information. .

Each monitoring hole group 4 in the step (2) includes at least five monitoring holes, and each monitoring hole is vertically and equidistantly arranged from top to bottom, and the material of the monitoring tube body 1 is polyvinyl chloride material, so The diameter of the monitoring tube body 1 is 75mm-100mm, the number of the outer monitoring channels 3 is 6, and the inner diameter of each monitoring channel is 30mm.

The filter screen 5 in the step (3) has a pore size of 50-100 mesh, and the internal plug 6 and the port plug 7 are both made of rubber material.

The single-hole multi-level groundwater monitoring system of the utility model realizes layered monitoring of multiple target aquifers in the same monitoring well hole, reduces the number of completed wells and the cost of maintenance and well cleaning, and is not limited by the depth of the aquifer , The depth of the well is large, and it can be installed in shallow groundwater monitoring wells of 30m-50m, and can also be installed in groundwater monitoring wells with a depth of hundreds of meters or even 300m.

Claims (6)

1. single hole multilayer position Groundwater Monitoring, it is characterized in that: comprise a columniform monitoring pipe body, axis direction along monitoring pipe body offers several columniform monitoring channels running through bottom surface on monitoring pipe body on monitoring pipe body, described monitoring channel comprises a center monitors passage being located at monitoring pipe body central and is along the circumferential direction evenly distributed on center monitors parameatal outside monitoring channel with several, is not communicated with mutually between each monitoring channel, on the monitoring pipe body tube wall of next-door neighbour each outside monitoring channel, the corresponding degree of depth that will sample is respectively equipped with a monitoring holes group, each monitoring holes group corresponding with it respectively one outside monitoring channel interconnects, each monitoring holes group is all enclosed with filter screen, below correspondence each monitoring holes group 20cm outside monitoring channel in be respectively equipped with an inner suppository for blocking, Single port suppository for blocking is respectively equipped with in the bottom of each outside monitoring channel, a underground water sampler and a water-level gauge is equipped with in center monitors passage and each outside monitoring channel, each underground water sampler and water-level gauge are all connected with the analysis of water terminal of outside.

2. single hole multilayer position according to claim 1 Groundwater Monitoring, is characterized in that: the material of described monitoring pipe body is pvc material.

3. single hole multilayer position according to claim 1 Groundwater Monitoring, is characterized in that: the aperture of described filter screen is 50-100 order.

4. single hole multilayer position according to claim 1 Groundwater Monitoring, is characterized in that: each monitoring holes group comprises at least five monitoring holes, and the vertically equidistantly arrangement from top to bottom of each monitoring holes.

5. single hole multilayer position according to claim 1 Groundwater Monitoring, it is characterized in that: the diameter of described monitoring pipe body is 75mm-100mm, the quantity of described outside monitoring channel is 6, and the internal diameter of each monitoring channel is 30mm.

6. single hole multilayer position according to claim 1 Groundwater Monitoring, is characterized in that: described inner suppository for blocking and port suppository for blocking are made by elastomeric material.