1. The utility model provides an underground water nest beam type layering monitoring well system which characterized in that includes:

the water-bearing stratum monitoring system comprises a plurality of monitoring pipes (1), wherein the ends of the monitoring pipes (1) are positioned on the same surface, the lengths of the monitoring pipes (1) are different, and the bottom of each monitoring pipe (1) corresponds to a corresponding water-bearing stratum;

the positioning pipe (2) is provided with a plurality of concave parts (3) along the circumferential direction of the positioning pipe (2), the number of the concave parts (3) corresponds to that of the monitoring pipe (1), and the concave parts (3) are suitable for embedding of the monitoring pipe (1).

2. An underground water nest type layered monitoring well system according to claim 1, characterized in that the depressions (3) are evenly distributed along the circumference of the positioning tube (2).

3. A groundwater nested layered monitoring well system according to claim 1, wherein the recess (3) covers half of the circumference of the monitoring tube (1).

4. An underground water nest beam layered monitoring well system according to any one of claims 1-3, characterized in that the bottom of the monitoring pipe (1) and the positioning pipe (2) is provided with a filtering structure (4), the length of the filtering structure (4) being the same as the thickness of the aquifer.

5. A groundwater nested layered monitoring well system according to claim 4, wherein the filtering structure (4) comprises:

the filtering holes are formed at the bottoms of the monitoring pipe (1) and the positioning pipe (2);

and the filter screen is arranged outside the filter hole and used for filtering the underground water entering the monitoring pipe (1) and the positioning pipe (2).

6. A groundwater nested layered monitoring well system according to any of claims 1-5, wherein fasteners (5) are provided at intervals in the axial direction of the monitoring pipe (1) and the positioning pipe (2), the fasteners (5) being used for fastening a plurality of the monitoring pipes (1) and the positioning pipe (2).

7. The underground water nest type layered monitoring well system according to claim 6, wherein the monitoring pipe (1) and the positioning pipe (2) are made of polyvinyl chloride materials.

8. A groundwater nested layered monitoring well system according to any of claims 1-7, wherein a sampler is provided in both the monitoring pipe (1) and the positioning pipe (2).

Background

The underground water monitoring well technology is the basis of underground water pollution investigation and protection, at present, the one-hole multilayer monitoring well technology is generally applied in developed countries such as Europe and America, and developed single-hole multilayer monitoring well technologies comprise a nested monitoring well, a continuous multi-channel monitoring well, a Waterloo monitoring well, a Westbay monitoring well and the like. However, China still mainly monitors a single well or a group of wells at different depths, and the multilayer monitoring well technology is still in the application and development stage and is not popularized in a large scale.

The nest type monitoring well is characterized in that two or more well pipes with different lengths are installed in a borehole from deep to shallow one by one, so that each well pipe can monitor a target aquifer independently. Nested wells suffer from the following problems in implementation: (1) because each level of monitoring pipe needs to be installed into the drilled hole one by one, the well completion time is long, and the monitoring pipe is touched and disturbed with the well wall for many times, so that the well wall is easy to collapse; (2) monitoring phenomena such as stirring resistance, winding and the like easily occurring among pipes, and influencing normal running installation of a well pipe; (3) layering and water stopping are difficult. The water-stop material is difficult to completely fill the gaps among the monitoring pipes, so that underground water among the monitoring layers is communicated through the gaps among the pipes, and the monitoring result is distorted.

The continuous multi-channel monitoring well adopts a continuous mode to extrude a high-density polyethylene pipe containing 2-7 channels, a filter part and a packer are processed on site, and a method of alternately backfilling a filter material and a water-stopping material is adopted after pipe discharging to form the well. In actual operation, there are the following problems: (1) the air sealed at the lower part of the packer in each stage of channel enables the monitoring pipe to generate very large buoyancy, so that the monitoring pipe is difficult to put down and install, extra pressure needs to be applied to the well pipe, the well pipe is easy to bend and deform, and the monitoring layer position is deviated; (2) the monitoring pipe channel mouth is less, and the packer is difficult accurate installation location, and the installation fastness is poor. If the expandable material is adopted, other channels are easy to be reduced; (3) well flushing and sampling are difficult, and special equipment is needed; (4) the lower channels of the packers have no practical use, resulting in material waste. (5) The well pipe cannot be reused.

The Waterloo monitoring well and the Westbay monitoring well have the defects of expensive instrument equipment, complex operation steps and complicated quality control program, cannot adapt to the national conditions of China, and have few application cases in China.

The domestic innovation on the multi-layer monitoring well technology is mainly based on the improvement of nested wells and continuous multi-channel monitoring wells.

For example, publication No. CN110671053A in the prior art discloses a well construction method for an underground water layered sampling monitoring well, which separates underground water of 2 aquifers below the ground by arranging a casing, and completes complete isolation and water stop of the 2 aquifers by adopting multiple water stop measures such as pouring concrete and throwing yellow clay. This technique only can monitor 2 aquifers, and monitoring efficiency is low to two monitoring levels need be under construction respectively in proper order, treat upper portion monitoring layer well-completion back, transfer the sleeve pipe in upper portion monitoring layer well pipe, then carry out the probing, low tube and the stagnant water operation of lower part monitoring level inside the sleeve pipe, and construction strength is big, and simultaneously, the setting of nonrust steel casing pipe has increased construction cost.

Chinese patent document CN111425186A discloses a shallow groundwater small-caliber cluster type monitoring well and a well completion method thereof, which includes an outer pipe and monitoring well pipes, wherein a plurality of monitoring well pipes are all inserted into an inner cavity of the outer pipe, an inner pipe centralizer is sleeved on each monitoring well pipe, and meanwhile, the monitoring well pipes are fixed by the inner pipe centralizer. Although, the method binds all the monitoring pipes into a cluster type and puts the monitoring pipes into the outer pipe together, thereby avoiding multiple pipe putting constructions. However, since the outer pipe is sleeved outside the monitoring well pipe, layered water stopping needs to be performed inside and outside the outer pipe respectively, and the difficulty and workload of water stopping construction are increased. Meanwhile, the arrangement of the inner pipe centralizer easily influences the falling of the water stopping material, and the problem of difficulty in water stopping among the monitoring pipes cannot be solved.

Disclosure of Invention

Therefore, the invention aims to overcome the defects of high construction cost, low construction efficiency, high construction difficulty and poor well forming quality of the layered monitoring well in the prior art, and provides the underground water nest beam type layered monitoring well system.

In order to solve the technical problem, the invention provides an underground water nest-bundle layered monitoring well system which comprises a plurality of monitoring pipes, wherein the end parts of the monitoring pipes are positioned on the same surface, the lengths of the monitoring pipes are different, and the bottom of each monitoring pipe corresponds to a corresponding aquifer; the positioning pipe is provided with a plurality of sunken parts along the circumferential direction of the positioning pipe, the number of the sunken parts corresponds to that of the monitoring pipes, and the sunken parts are suitable for embedding of the monitoring pipes.

Optionally, the recessed portions are uniformly distributed along the circumferential direction of the positioning tube.

Optionally, the recess covers half of the circumference of the monitoring tube.

Optionally, the bottom of monitoring pipe and registration arm is equipped with filtration, filtration's length with the thickness of aquifer is the same.

Optionally, the filter structure includes: the filtering holes are formed at the bottoms of the monitoring pipe and the positioning pipe; and the filter screen is arranged outside the filter hole and used for filtering the underground water entering the monitoring pipe and the positioning pipe.

Optionally, fastening members are provided at intervals along the axial direction of the monitoring pipe and the positioning pipe, and the fastening members are used for fastening a plurality of the monitoring pipes and the positioning pipes.

Optionally, the monitoring pipe and the positioning pipe are both made of polyvinyl chloride materials.

Optionally, the monitoring pipe and the positioning pipe are both provided with samplers.

The technical scheme of the invention has the following advantages:

1. the invention provides an underground water nest beam type layered monitoring well system which comprises a plurality of monitoring pipes, wherein the end parts of the monitoring pipes are positioned on the same surface, the lengths of the monitoring pipes are different, and the bottom of each monitoring pipe corresponds to a corresponding aquifer; the positioning pipe is provided with a plurality of sunken parts along the circumferential direction of the positioning pipe, the number of the sunken parts corresponds to that of the monitoring pipes, and the sunken parts are suitable for embedding of the monitoring pipes.

Through with the monitoring pipe imbed respectively along the depressed part that the circumference direction of registration arm set up in to fix a position the monitoring pipe through the registration arm, because the setting of registration arm has avoided having the clearance between two adjacent monitoring pipes, avoid appearing the perpendicular condition of crossing water between the monitoring pipe. Meanwhile, a plurality of monitoring pipes are set to be different in length, and each monitoring pipe corresponds to the aquifer, so that each monitoring pipe can monitor the corresponding aquifer. This between monitoring pipe and the registration arm zonulae occludens become beam type well casing to wholly insert to the drilling in, guaranteed the bulk strength of monitoring pipe and registration arm, and then guaranteed the stagnant water effect between each monitoring pipe and registration arm, improved the bulk strength and the life of monitoring well. Because the monitoring well only needs to drill once, each monitoring pipe and each positioning pipe can respectively correspond to a plurality of aquifers for monitoring, the process is simple, the construction efficiency and the well forming quality are improved, the number of drilling construction is reduced, the construction and management cost is saved, and the large-scale application and popularization are facilitated.

2. According to the underground water nest-bundle-type layered monitoring well system, the concave parts are uniformly distributed along the circumferential direction of the positioning pipe, so that the concave parts are conveniently arranged, the installation stability of the monitoring pipe arranged in the concave parts is ensured, and the distribution uniformity of the monitoring pipe and the positioning pipe in a drill hole is ensured.

3. According to the underground water nest-bundle-type layered monitoring well system, the monitoring pipe and the positioning pipe are made of polyvinyl chloride materials, the monitoring pipe and the positioning pipe can be tightly connected due to the consistency of the materials of the monitoring pipe and the positioning pipe, and the phenomenon that water is vertically mixed among the monitoring pipes due to poor water stopping effect is avoided.

4. The invention provides an underground water nest beam type layered monitoring well system, wherein fasteners are arranged at intervals along the axial direction of a monitoring pipe and a positioning pipe, and the fasteners are used for fastening a plurality of monitoring pipes and positioning pipes; the monitoring pipe and the positioning pipe can be fixedly combined into a whole by utilizing the fastener, and then the monitoring pipe and the positioning pipe are jointly inserted into the drilled hole, so that the integrity and the tightness of each monitoring pipe and each positioning pipe are ensured.

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 description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of an underground water nest bundle type layered monitoring well system provided by the invention;

fig. 2 is a top view of fig. 1.

1-monitoring the tube; 2-positioning the tube; 3-a recess; 4-a filter structure; 5-a fastener; 6-drilling.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 and 2, an underground water nest bundle type layered monitoring well system provided by an embodiment of the present invention includes a plurality of monitoring pipes 1, ends of the plurality of monitoring pipes 1 are located on the same surface, lengths of the plurality of monitoring pipes 1 are different, and a bottom of each monitoring pipe 1 corresponds to a corresponding aquifer; the positioning pipe 2 is provided with a plurality of concave parts 3 along the circumferential direction of the positioning pipe 2, the number of the concave parts 3 corresponds to that of the monitoring pipes 1, and the concave parts 3 are suitable for embedding the monitoring pipes 1.

Through with monitoring pipe 1 imbed respectively along the depressed part 3 of the circumference direction setting of registration arm 2 in to fix a position monitoring pipe 1 through registration arm 2, because the setting of registration arm 2 has also avoided having the clearance between two adjacent monitoring pipes 1, still guaranteed that two adjacent monitoring pipes 1 are independent individuality, avoid appearing the condition of perpendicular cluster water. Simultaneously, set a plurality of monitoring pipes 1 to different length, every monitoring pipe 1 corresponds the aquifer to can monitoring pipe 1 monitor corresponding aquifer respectively. This zonulae occludens becomes beam type well casing between monitoring pipe 1 and the registration arm 2 to wholly insert to drilling 6 in, guaranteed monitoring pipe 1 and registration arm 2's bulk strength, and then guaranteed the stagnant water effect between each monitoring pipe 1 and registration arm 2, improved the bulk strength and the life of monitoring well. Because the monitoring well only needs one-time pore forming, each monitoring pipe 1 can respectively correspond to a plurality of aquifers for monitoring, the process is simple, the construction efficiency and the well forming quality are improved, the number of drilling construction is reduced, the construction and management cost is saved, and the large-scale application and popularization are facilitated.

Further, since the number of the monitoring pipes 1 is four, the cross sections of the four monitoring pipes 1 are arranged in a stepped manner, and the number of the concave portions 3 corresponds to the number of the monitoring pipes 1, the number of the concave portions 3 is four. Each monitoring pipe 1 and each positioning pipe 2 in the four monitoring pipes 1 respectively correspond to the aquifer which is underground, so that each aquifer is monitored by the monitoring pipes 1 and the positioning pipes 2 respectively. And the depressed parts 3 are uniformly distributed along the circumferential direction of the positioning pipe 2, so that the depressed parts 3 are convenient to set, and the installation stability of the monitoring pipe 1 arranged in the depressed parts 3 is ensured.

As an alternative embodiment, the recesses 3 are unevenly distributed along the circumference of the positioning tube 2, and may be set according to the actual situation.

As an alternative embodiment, the number of the monitoring pipes 1 is three, and the cross sections of the three monitoring pipes 1 are arranged in a step manner, that is, the filter structures 4 of the three monitoring pipes 1 correspond to three aquifers, and the number of the recesses 3 is also three. The number of the specific monitoring pipes 1 is set according to the actual situation.

In this embodiment, the recessed portion 3 is an arc-shaped groove, and the projection of the monitoring tube 1 is circular, that is, the monitoring tube 1 is a circular tube, so that the tight connection between the monitoring tube 1 and the recessed portion 3 on the positioning tube 2 is ensured.

As an alternative embodiment, the projection of the monitoring tube 1 may also be shaped, and the recess 3 on the positioning tube 2 may also be shaped, so as to ensure a tight connection between the monitoring tube 1 and the recess 3 on the positioning tube 2.

As an alternative embodiment, the projection of the monitoring tube 1 may also be square, and the recess 3 on the positioning tube 2 may also be square, so as to ensure a tight connection between the monitoring tube 1 and the recess 3 on the positioning.

Furthermore, the depressed part 3 covers half of the perimeter of the monitoring pipe 1, so that the depressed part 3 is tightly attached to the outer wall of the monitoring pipe 1, the function of water stopping between pipes is achieved, and the situation of vertical water leakage is avoided.

As shown in fig. 1, since the bottom of the monitoring pipe 1 and the bottom of the positioning pipe 2 are directly contacted with the aquifer, a filtering structure 4 may be disposed at the bottom of the monitoring pipe 1 and the bottom of the positioning pipe 2. And the length of the filtering structure 4 is the same as the thickness of the aquifer; in this embodiment, the filtering structure 4 includes a filtering hole and a filtering net; the filtering holes are formed at the bottoms of the monitoring pipe 1 and the positioning pipe 2, and the filter screen is arranged outside the filtering holes and used for filtering underground water entering the monitoring pipe 1 and the positioning pipe 2, so that the cleanliness of the sampled underground water is ensured.

The number of the filtering holes can be set according to actual conditions, the aperture of the filtering holes can ensure that underground water smoothly enters the monitoring pipe 1 and the positioning pipe 2, and then the filtering net is utilized to filter the underground water, so that the cleanness of the underground water is ensured, and turbidity is avoided. The samplers are arranged in each monitoring pipe 1 and each positioning pipe 2, so that the samplers in the monitoring pipes 1 and the positioning pipes 2 can be used for sampling the underground water.

In this embodiment, the monitoring pipe 1 and the positioning pipe 2 are made of polyvinyl chloride material, so that the gap between the monitoring pipe 1 and the positioning pipe 2 can be fully filled, and vertical water leakage between the monitoring pipes 1 and the positioning pipes 2 is avoided. When connecting monitoring pipe 1 and registration arm 2, brush environmental protection glue in the surface of depressed part 3 at first, then imbed monitoring pipe 1 in depressed part 3 again, other monitoring pipe 1 are connected with this mode again, until accomplishing all monitoring pipe 1's fixings. Specifically, the polyvinyl chloride material is a PVC-U material. The monitoring tube 1 and the positioning tube 2 made of PVC-U materials have the advantages of light weight, convenience in carrying and construction, excellent acid and alkali resistance and corrosion resistance, and therefore the service lives of the monitoring tube 1 and the positioning tube 2 are prolonged.

When monitoring pipe 1 is connected with registration arm 2 on ground, place registration arm 2 along the horizontal direction, use four monitoring pipe 1 as an example: the positioning pipe 2 is arranged from the top of the monitoring pipe 1 to the bottom of the deepest underground water monitoring layer position in the direction towards the bottom of the monitoring pipe 1.

Fasteners 5 can be arranged at intervals along the axial direction of the monitoring pipe 1 and the positioning pipe 2, and the fasteners 5 are used for fastening a plurality of monitoring pipes 1 and positioning pipes 2; in the present embodiment, the fastening member 5 is a tight-fitting member, i.e., a hoop. The monitoring pipe 1 and the positioning pipe 2 are fixedly combined into a whole by arranging a circle of fasteners 5 every 0.5m-3m and then are inserted into the drill hole 6 together. Wherein, the setting number of fasteners 5 can be set according to the degree of depth of monitoring the position by oneself.

The specific well completion method comprises the following steps: firstly, drilling and forming holes, namely, coring a drill hole 6 at a monitoring point position, determining the stratum condition and the starting and stopping depth of each monitoring layer, ensuring that the diameter of the drilled and formed holes is 10-20 cm larger than the maximum section of the nested well pipe, namely, leaving installation allowance, facilitating the insertion of a plurality of monitoring pipes 1 and positioning pipes 2 into the drill hole 6, and simultaneously ensuring the thickness of a backfilled filter material and a water stop material. Secondly, the monitoring pipes 1 and the positioning pipes 2 are designed, and the lengths of the monitoring pipes 1 and the positioning pipes 2 and the positions of the filtering structures 4 are determined according to the starting and stopping depths of all monitoring layers. Then brushing environment-friendly glue in the concave parts 3 of the positioning pipes 2, sequentially installing monitoring pipes 1 with different depths in each concave part 3, aligning the tops of the monitoring pipes 1, and respectively corresponding the bottoms to different monitoring layers, namely aquifers; and finally, fixing and combining the monitoring pipes 1 and the positioning pipes 2 into a unified whole through fasteners 5, and then wrapping a layer of filter screen on the outer sides of the water filtering pipe parts of the monitoring pipes 1 and the positioning pipes 2. And (3) combining the monitoring pipes 1 and the positioning pipes 2 into a bundle well pipe, then integrally descending into the monitoring well hole, and performing layered gravel filling and water stopping on the monitoring pipes 1 and the positioning pipes 2 from bottom to top. And finally, performing well washing operation on each monitoring pipe 1 and each positioning pipe 2 in sequence, and completing well washing after the pumped underground water is clear from turbidity. After the well washing is completed, the sampler is placed in the pipe cavity of each monitoring pipe 1 and each positioning pipe 2, and then sampling monitoring is carried out on each layer of underground water.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.