Underground water level observation and recharge integrated system and application method thereof

Abstract

The invention relates to an underground water level observation and recharge integrated system and an application method thereof, and the underground water level observation and recharge integrated system comprises a water level monitoring and recharge device, a well casing, automatic water delivery equipment, a water pipe, automatic monitoring and control equipment and static pressure equipment, the well pipe is connected with the automatic water conveying device through a water pipe and pressed into a soil layer through the static pressure device, and the automatic monitoring and control device is connected with and controls the automatic water conveying device according to data of the water level monitoring and recharging device. The invention has the advantages that: 1) the efficiency is greatly improved, the requirements on construction machinery are also greatly reduced, and the cyclic utilization is realized; disturbance to undisturbed soil is reduced to a great extent, the water level sensing element can be effectively prevented from being disturbed by soil particles, the underground water level testing precision is effectively improved, the water level of a set soil layer is continuously kept stable, the whole implementation process is efficient and convenient, operability is high, and the expected effect is quite remarkable.

Description

Technical Field

[0001] The present invention relates to the field of groundwater level control and geotechnical engineering testing technology, and in particular to a groundwater level observation and recharge integrated system and an application method thereof. Background Art

[0002] When the groundwater level is high, it is usually necessary to lower the groundwater level in the pit during the excavation process. If a thicker confined aquifer is involved, the retaining structure cannot isolate the confined aquifer, and the pit dewatering often causes a significant drop in the water level in the soil layer outside the pit, which may cause uneven settlement of adjacent sensitive buildings (structures), which may endanger the safety of the structure in severe cases. In order to protect the safety of the environment around the foundation pit, it is usually necessary to take groundwater recharge measures outside the pit in combination with the drop in the water level outside the pit while dewatering the pit. However, there are still many disadvantages in the current water level observation and recharge process outside the pit.

[0003] Groundwater level observation usually starts with drilling to bury water level observation pipes, and the water level changes in the pipes are measured by water gauges or water level meters during the monitoring process. However, drilling will cause serious damage to the rock and soil structure within a certain range around it, causing changes in the permeability of the hole wall, and the backfill quality is difficult to control, making it difficult to grasp the quality of water level observation data. Groundwater level recharge is generally carried out by constructing large-diameter recharge wells first, which has the problems of long well construction time, complex procedures, and high costs. In addition, abandoned recharge wells may become underground obstacles, hindering subsequent land development and utilization, and also causing environmental problems such as water quality and soil pollution. In addition, both water level observation holes and recharge wells are disposable consumables and cannot be recycled and reused, which does not conform to the low-carbon, environmentally friendly, and economic concepts. Summary of the invention

[0004] The purpose of the present invention is to provide an integrated system for groundwater level observation and recharging and its application method based on the deficiencies of the above-mentioned prior art, which uses a water level monitoring and recharging device, a segmented well pipe, a static pressure device, an automated monitoring device and an automated water delivery device to form an integrated system, and the water level monitoring and recharging device is connected to the segmented small-diameter well pipe and pressed into the soil through the static pressure device to quickly form a well structure, simplifying the traditional well-making process and time, reducing the disturbance to the original soil, and avoiding the problems of long construction period, difficult control of construction quality, and difficult mud treatment during the construction process caused by the traditional drilling method. After use, the segmented well pipe, water level monitoring and recharging device can be pulled out and recycled by static pressure equipment to improve efficiency, reduce costs, and be low-carbon and environmentally friendly.

[0005] The purpose of the present invention is achieved by the following technical solutions: An integrated system for groundwater level observation and recharge, characterized in that it includes a water level monitoring and recharge device, a well pipe, an automated water delivery device, a water pipe, an automated monitoring and control device, and a static pressure device, wherein the water level monitoring and recharge device is arranged at the bottom of the well pipe, the well pipe is connected to the automated water delivery device via the water pipe, the well pipe is pressed into the soil layer via the static pressure device, and the automated monitoring and control device controls the automated water delivery device based on the data connection of the water level monitoring and recharge device.

[0006] The water level monitoring and recharge device includes a conical drill bit, a water pressure sensing structure, a permeable steel pipe, a permeable structure, and a granular body, wherein the conical drill bit is arranged at the bottom, the water pressure sensing structure is arranged above the conical drill bit, the permeable steel pipe is used for allowing groundwater to enter and be sensed by the water pressure sensing structure, the permeable structure is used to prevent the water pressure sensing structure from directly contacting the soil, and the three-dimensional body is used to prevent the permeable structure from being blocked.

[0007] The upper part of the water level monitoring and recharging device is provided with a threaded joint, and the water level monitoring and recharging device is detachably connected and fixed to the well pipe via the threaded joint.

[0008] A plurality of inner supporting steel rings are arranged on the inner side of the water-permeable steel pipe along the length direction.

[0009] The water pressure sensing structure is provided with a sealing device to prevent groundwater from entering the water pressure sensing structure.

[0010] The water pressure sensing structure is connected to the automatic monitoring and control equipment via a water level observation data cable.

[0011] An application method of the above-mentioned groundwater level observation and recharge integrated system is characterized in that the application method comprises the following steps: Use static pressure equipment to implement water level monitoring and recharging devices and well pipes, and connect the well pipes to automated water delivery equipment through water pipes; Collect water level data of water level monitoring and recharging devices in real time through automated monitoring and control equipment, determine the initial stable water level of the soil layer, and set a warning value of soil layer water level drop in the automated monitoring and control equipment according to demand; During the construction of the entire foundation pit, the automated monitoring and control equipment determines that the soil water level has dropped to a preset warning value based on the soil water level data monitored by the water level monitoring and recharging device, and sends a recharging water instruction to the automated water delivery equipment to start groundwater recharging. After monitoring that the soil water level has returned to the initial water level, the automated monitoring and control equipment controls the automated water delivery equipment to temporarily stop water delivery and recharging to continuously ensure the stability of the soil water level.

[0012] A plurality of well pipes are spliced ​​section by section on the water level monitoring and recharging device, and are injected and pressed into the soil layer by using the static pressure device.

[0013] After the foundation pit construction is completed and the ground water level returns to stability, the test is terminated and the well pipe and water level monitoring and reinjection device are pulled out and recovered in sections using static pressure equipment.

[0014] The advantages of the present invention are: 1) The well pipe, water level monitoring device and reinjection device are sectioned and statically pressurized and recovered by static pressure equipment, which greatly improves the efficiency compared with the traditional drilling method, greatly reduces the requirements for construction machinery, and realizes recycling, which not only greatly reduces the testing cost, but also avoids the retention of underground obstacles in the future compared with the traditional abandoned well model.

[0015] 2) The static pressure burial method greatly reduces the disturbance to the original soil. The specially designed water level monitoring and recharging device structure can effectively prevent the water level sensing element from being disturbed by soil particles, effectively improving the test accuracy of the groundwater level.

[0016] 3) An integrated system for groundwater level observation and recharge is used, and the water level in the given soil layer is kept stable through automatic control throughout the entire process. The entire implementation process is efficient and convenient, with strong operability, and the expected effect is very significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the system structure device of the present invention; Figure 2 A schematic diagram of the detailed structure of the water level monitoring and recharging equipment in the system of the present invention; Figure 3 It is a schematic diagram of step 1 of the system structure device testing process of the present invention; Figure 4 This is a schematic diagram of step 2 of the system structure device testing process of the present invention; Figure 5 This is a schematic diagram of step three of the system structure device testing process of the present invention; Figure 6 This is a schematic diagram of step 4 of the system structure device testing process of the present invention; Figure 7 This is a schematic diagram of step five of the system structure device testing process of the present invention; Figure 8 It is a schematic diagram of the use of the present invention. DETAILED DESCRIPTION

[0018] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: like Figure 1-8As shown, the numbers in the figure respectively represent: water level monitoring and recharging device 1, well pipe 2, automated water delivery equipment 3, water pipe 4, automated monitoring and control equipment 5, static pressure equipment 6, upper soil layer of test soil layer 7, water level monitoring and recharging soil layer 8, adjacent underground pipeline 9, adjacent building 10, adjacent operating rail transit 11, adjacent construction foundation pit 12, drill bit 101, water pressure sensing structure 102, permeable steel pipe 103, permeable structure 104, granular body 105, inner support steel ring 106, partition 107, threaded joint 108, data cable protection device 109, sealing device 110, data cable 111.

[0019] Example: Figures 1 to 5 As shown, the integrated groundwater level observation and recharge system in this embodiment includes a water level monitoring and recharge device 1, a well pipe 2, an automatic water delivery device 3, a water pipe 4, an automatic monitoring and control device 5, and a static pressure device 6.

[0020] Among them, the water level monitoring and recharging device 1 includes a drill bit 101, a water pressure sensing structure 102, a permeable steel pipe 103, a permeable structure 104, a granular body 105, an inner support steel ring 106, a partition 107, a threaded joint 108, a data cable protection device 109, a sealing device 110, and a data cable 111.

[0021] The drill bit 101 is a conical drill bit with a certain diameter and a solid steel structure. Its main function is to reduce the resistance encountered by the water level monitoring and recharging device 1 as a pressing end when it is pressed into the soil.

[0022] The water pressure sensing structure 102 implements the water level test by sensing the water pressure at the position of the permeable structure.

[0023] The length of the permeable steel pipe 103 can be customized as needed, and the thickness is estimated according to the strength of the soil layer pressed into it. The permeable holes are staggered up and down on the steel pipe to achieve the introduction of groundwater.

[0024] The main function of the permeable structure 104 is to prevent the water pressure sensing structure from directly contacting the soil and to accurately transmit the water pressure to the water pressure sensing structure 102 .

[0025] The granular body 105, including but not limited to medium-coarse sand, has the main function of preventing external soil from directly entering the device and adhering to the permeable structure 104, causing the permeable structure 104 to be blocked and affecting the transmission of water pressure. Figure 2 As shown, multiple layers of granular bodies 104 can be arranged in the permeable steel pipe 103 to improve the anti-clogging effect.

[0026] The main function of the inner support steel ring 106 is to improve the overall rigidity of the water-permeable steel pipe 103 and prevent damage caused by excessive pressure during the pressing process.

[0027] The partition 107 is arranged inside the water-permeable steel pipe 103. The area above the partition 106 is the recharging section of the water-permeable steel pipe 103, and the area below the partition 107 is the water permeation and filtering section for water level observation.

[0028] The main function of the threaded joint 108 is to connect the upper well pipe mechanically.

[0029] The protection device 109 is used to prevent the cable from being damaged by soil pressure during the burial process.

[0030] The sealing device 110 prevents groundwater from entering the water pressure sensing structure.

[0031] The water level observation data cable 111 has one end installed on the outer wall of the pipe through a fastener and connected to the ground automatic monitoring and control equipment 5, and the other end is connected to the inside of the water pressure sensing structure 102. During the water level observation process, the water pressure sensing structure 102 transmits the water level data to the monitoring system through the cable according to the instructions of the automatic monitoring and control equipment 5.

[0032] The length and diameter of the well pipe 2 are customized according to the project needs, and are matched with the water level monitoring and recharging device 1. They are made of metal, with internal and external threads at both ends. Mechanical connections are adopted between the well pipes 2 and between the well pipes 2 and the water level monitoring and recharging device 1.

[0033] The automated water delivery equipment 3 has one end connected to the external municipal water system by a constant pressure pump and the other end connected to the well pipe 2 through a water pipe 4, and automatically recharges according to the instructions of the automated monitoring equipment.

[0034] One end of the water pipe 4 is connected to the automatic water delivery equipment 3, and the other end is connected to the well pipe 2 located on the surface.

[0035] The automatic monitoring and control equipment 5 has the following main functions: collecting and receiving water level observation data from the water level monitoring and recharging device 1; sending a recharging instruction to the automatic water delivery equipment 3 when the water level drops below the warning value; and sending a stop recharging instruction to the automatic water delivery equipment 3 when the water level rises back to the initial water level.

[0036] The static pressure device 6 can press the water level monitoring and recharging device 1 and the well pipe 2 into the designated soil layer section by section, and after the construction is completed, the water level monitoring and recharging device 1 and the well pipe 2 can be pulled out section by section.

[0037] The soil layer 8 for water level monitoring and recharging is covered by the upper soil layer 7 of the test soil layer.

[0038] like Figure 8 As shown, in actual construction, this embodiment includes the following processes: (1) The number and size of the well pipes 2 are determined according to the test requirements and the depth of the soil layer, and the cable length of the water level monitoring and recharging device 1 is determined based on this.

[0039] (2) First, a static pressure device 6 is installed at a designated position above the soil layer 8 to be tested, and then the water level monitoring and recharging device 1 is connected to multiple well pipes 2 section by section through threaded joints, and the static pressure device 6 is used to gradually press it into the upper soil layer 7 of the test soil layer and the water level monitoring and recharging soil layer 8; (3) After the water level monitoring and recharging device 1 is delivered to the specified depth of the water level monitoring and recharging soil layer 8, the data cable 111 is connected to the automatic monitoring and control device 5, and the static pressure device 6 can be removed at the same time; (4) Connect one end of the water pipe 4 to the automated water delivery equipment 3, and the other end to the pipe opening of the well pipe 2 located on the surface, and ensure that the connection position is well sealed.

[0040] (5) Before the construction of the foundation pit 12, the automatic monitoring and control equipment 5 and the automatic water delivery equipment 3 are turned on to check the integrity of the equipment. The water level data of the water level monitoring and recharging device 1 is collected in real time by the automatic monitoring and control equipment 5 to determine the initial stable water level of the water level monitoring and recharging soil layer 8, and the warning value of the water level drop of the water level monitoring and recharging soil layer 8 is set in the automatic monitoring and control equipment 5 according to the needs.

[0041] (6) When the construction of the foundation pit 12 begins, the automated monitoring and control device 5 determines that the water level of the water level monitoring and recharging soil layer 8 has dropped to a preset warning value through the monitored water level monitoring and recharging soil layer 8 water level data, and then sends a recharging water instruction to the automated water delivery device 3 to start groundwater recharging. After monitoring that the water level of the water level monitoring and recharging soil layer 8 has risen to the initial water level, the automated monitoring and control device 5 sends a stop groundwater recharging instruction to the automated water delivery device 3. After receiving the instruction, the automated water delivery device 3 temporarily stops water delivery and recharging.

[0042] (7) During the entire construction process of the foundation pit 12, the automated monitoring and control equipment 5 and the automated water delivery equipment 3 cooperate to continuously ensure the stability of the water level monitoring and the water level of the recharged soil layer 8.

[0043] (8) After the construction of the foundation pit 12 is completed and the groundwater level of the water level monitoring and recharging soil layer 8 returns to stability, the test is terminated, and the static pressure equipment 6 is installed at the same designated position to pull out and recover the connecting well pipe 2 and the water level monitoring and recharging device 1 in sections, calibrate and inspect them for quality, and then reuse them.

[0044] Although the above embodiments have described in detail the concepts and embodiments of the present invention with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and changes can still be made to the present invention without departing from the scope of the claims, so they are not described one by one here.

Claims

1. An integrated system for groundwater level observation and recharge, characterized in that: It includes a water level monitoring and recharging device, a well pipe, an automated water delivery device, a water pipe, an automated monitoring and control device, and a static pressure device, wherein the water level monitoring and recharging device is arranged at the bottom of the well pipe, the well pipe is connected to the automated water delivery device via the water pipe, the well pipe is pressed into the soil layer via the static pressure device, and the automated monitoring and control device controls the automated water delivery device according to the data connection of the water level monitoring and recharging device.

2. The groundwater level observation and recharge integrated system according to claim 1 is characterized in that: The water level monitoring and recharge device includes a conical drill bit, a water pressure sensing structure, a permeable steel pipe, a permeable structure, and a granular body, wherein the conical drill bit is arranged at the bottom, the water pressure sensing structure is arranged above the conical drill bit, the permeable steel pipe is used for allowing groundwater to enter and be sensed by the water pressure sensing structure, the permeable structure is used to prevent the water pressure sensing structure from directly contacting the soil, and the three-dimensional body is used to prevent the permeable structure from being blocked.

3. The groundwater level observation and recharge integrated system according to claim 2 is characterized by: The upper part of the water level monitoring and recharging device is provided with a threaded joint, and the water level monitoring and recharging device is detachably connected and fixed to the well pipe via the threaded joint.

4. The groundwater level observation and recharge integrated system according to claim 2 is characterized in that: A plurality of inner supporting steel rings are arranged on the inner side of the water-permeable steel pipe along the length direction.

5. The groundwater level observation and recharge integrated system according to claim 2 is characterized by: The water pressure sensing structure is provided with a sealing device to prevent groundwater from entering the water pressure sensing structure.

6. The groundwater level observation and recharge integrated system according to claim 2 is characterized by: The water pressure sensing structure is connected to the automatic monitoring and control equipment via a water level observation data cable.

7. An application method of the groundwater level observation and recharge integrated system according to any one of claims 1 to 6, characterized in that: The application method comprises the following steps: Use static pressure equipment to implement water level monitoring and recharging devices and well pipes, and connect the well pipes to automated water delivery equipment through water pipes; Collect water level data of water level monitoring and recharging devices in real time through automated monitoring and control equipment, determine the initial stable water level of the soil layer, and set a warning value of soil layer water level drop in the automated monitoring and control equipment according to demand; During the construction of the entire foundation pit, the automated monitoring and control equipment determines that the soil water level has dropped to a preset warning value based on the soil water level data monitored by the water level monitoring and recharging device, and sends a recharging water instruction to the automated water delivery equipment to start groundwater recharging. After monitoring that the soil water level has returned to the initial water level, the automated monitoring and control equipment controls the automated water delivery equipment to temporarily stop water delivery and recharging to continuously ensure the stability of the soil water level.

8. The application method of the groundwater level observation and recharge integrated system according to claim 7 is characterized by: A plurality of well pipes are spliced ​​section by section on the water level monitoring and recharging device, and are injected and pressed into the soil layer by using the static pressure device.

9. The application method of the groundwater level observation and recharge integrated system according to claim 7 is characterized by: After the foundation pit construction is completed and the ground water level returns to stability, the test is terminated and the well pipe and water level monitoring and reinjection device are pulled out and recovered in sections using static pressure equipment.

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