A device for measuring the water conductivity of drainage pipes wrapped with geotextile
Patent Information
- Application Number
- CN202521899290.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-04
- Publication Date
- 2026-09-01
- Estimated Expiration
- 2035-09-04
AI Technical Summary
[0007]为了克服上述的技术问题，本实用新型的目的在于提供一种排水管外裹土工布导水系数测量装置，以解决上述背景技术中提出的传统土工布检测时存在工况模拟失真、边界效应影响以及系统综合性不足的问题
[0027]1.本实用新型采用排水管将盛有水液的模型箱贯穿，配合上对排水管表面通孔遮挡，从而让水液穿过土工布后经过排水管排出，定时计算即可得到导水系数。
Smart Images
Figure CN224707893U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of geotextile testing technology, specifically a device for measuring the water conductivity coefficient of geotextile wrapped around a drainage pipe. Background Technology
[0002] Currently, the water conductivity of drainage pipes wrapped with geotextile is typically measured using a constant head or variable head permeameter on geotextile samples laid flat. However, these traditional methods have significant limitations:
[0003] Distortion in working condition simulation: In actual engineering, geotextile is tightly wrapped around the circular drainage pipe and is under a certain bending and tension state. Flat laying test cannot simulate this actual wrapping form. The effective water passage area, pore structure and stress of geotextile under bending state are changed, resulting in a significant deviation between the water conductivity measured in the laboratory and the actual situation.
[0004] Boundary effect: The clamping boundary of traditional instruments is rigid and sealed, which does not match the boundary conditions of porous media such as geotextile and soil and pipeline in actual engineering, and may introduce additional measurement errors.
[0005] Insufficient system integration: Existing equipment only tests the geotextile itself and cannot evaluate the overall permeability and drainage performance of the geotextile-drainage pipe assembly under actual working conditions.
[0006] In conclusion, there is an urgent need for a specialized instrument that can realistically simulate the actual working state of geotextiles and measure their water conductivity under actual wrapping conditions, in order to fill the gap in existing testing technologies. Utility Model Content
[0007] In order to overcome the above-mentioned technical problems, the purpose of this utility model is to provide a device for measuring the water conductivity coefficient of drainage pipe wrapped with geotextile, so as to solve the problems of distorted working condition simulation, boundary effect influence and insufficient system integration in the traditional geotextile testing mentioned in the background art.
[0008] This utility model provides the following technical solution: a device for measuring the water conductivity coefficient of a drainage pipe wrapped with geotextile, including a water supply mechanism, wherein the water supply mechanism includes an open-shaped model box and a water pump for supplying water to it;
[0009] The system includes a drainage mechanism, which consists of a drainage pipe that penetrates the shell of the model box and has several through holes distributed on its surface, and geotextile is wrapped around the through holes of the drainage pipe to block water.
[0010] In addition, a measuring cup placed in the water outlet area of the drain pipe is used to collect the water flowing out of the drain pipe.
[0011] To achieve the above technical solution, a drainage pipe is used to pass through the model box containing water, and the through holes on the surface of the drainage pipe are blocked, so that the water passes through the geotextile and is discharged through the drainage pipe. The water conductivity can be obtained by periodic calculation.
[0012] As a further improvement to this utility model, the model box is a transparent component.
[0013] The above technical solution facilitates direct observation of the water level inside the model tank.
[0014] As a further improvement to this utility model, the surface of the water pump is marked with several water level lines distributed along the Y-axis.
[0015] To achieve the above technical solution, it is necessary to observe and determine whether the water pump has a constant head.
[0016] As a further improvement to this utility model, a flow meter is installed on the outlet pipe of the water pump.
[0017] Implementing the above technical solution facilitates the adjustment of the water pump's flow rate.
[0018] As a further improvement to this utility model, the perforation area through which the drain pipe penetrates the model box is provided with a rubber sleeve, and waterproof glass glue is applied to the perforation area.
[0019] The above technical solution improves the sealing effect at the connection between the drainage pipe and the model box, reducing the probability of leakage. In addition, by replacing the rubber sleeves of different specifications, it can be adapted to drainage pipes of various diameters, making it widely applicable.
[0020] As a further improvement to this utility model, the drain pipe is inclined.
[0021] The above technical solution enables the average installation angle of drainage pipes to be simulated during construction.
[0022] As a further improvement to this utility model, a measuring cup is placed below each of the two open ends of the drain pipe.
[0023] Implementing the above technical solution facilitates the collection of water at both ends of the drainage pipe, thereby improving the accuracy of the test.
[0024] As a further improvement to this utility model, several straps are attached to the surface of the geotextile to make the geotextile adhere tightly to the surface of the drainage pipe.
[0025] The above technical solution prevents water from entering the drainage pipe through the gap between the geotextile and the drainage pipe.
[0026] The technical effects and advantages of this utility model are as follows:
[0027] 1. This utility model uses a drainage pipe to pass through a model box containing water, and the through holes on the surface of the drainage pipe are blocked, so that the water passes through the geotextile and is discharged through the drainage pipe. The water conductivity can be obtained by periodic calculation.
[0028] 2. This utility model is designed to fix the permeable cavity of a real drainage pipe section, so that the geotextile sample can be fixed with the same bending radius and wrapping method as in actual engineering, perfectly replicating its real working state, greatly improving the accuracy and reliability of the test results. It can not only measure the water conductivity of the geotextile, but also intuitively observe and evaluate the drainage smoothness of the entire system. Attached Figure Description
[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 This is a top-view perspective view of the overall structure of this utility model.
[0031] Figure 2 This is a top-view perspective view of the overall structure of this utility model in cross-section.
[0032] Figure 3 This is a schematic diagram of the installation process of the drainage mechanism structure of this utility model.
[0033] Figure 4 This is a schematic diagram illustrating the derivation of the water conductivity coefficient of this utility model.
[0034] The names represented by the part numbers in the above diagram are as follows:
[0035] 100. Water supply mechanism; 110. Model box; 111. Water pump; 112. Rubber sleeve; 200. Drainage mechanism; 210. Drainage pipe; 211. Cable tie; 333. Geotextile; 444. Measuring cup; Detailed Implementation
[0036] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0037] Example:
[0038] Refer to the attached diagram in the instruction manual. Figure 1-3 This utility model provides a device for measuring the water conductivity of geotextile wrapped around a drainage pipe, used to determine the permeability of geotextile 333 on the outer wall of the drainage pipe. Its core structure and measurement process are as follows:
[0039] In water supply organizations:
[0040] Model box 110 is made of 0.8mm thick transparent acrylic and has a rectangular open structure (70cm long × 50cm wide × 50cm high). It is used to simulate the groundwater environment. Water level lines distributed along the Y-axis are marked on the outside of the box wall. The water pump 111 is connected to a flow meter through its outlet pipe and connected to model box 110. At the same time, water is supplied to model box 110 through the pipe to achieve controllable water level.
[0041] The side wall of the model box 110 has an opening, and a rubber sleeve 112 is fitted over the opening. Waterproof glass glue is applied to the contact gap to prevent water leakage inside the box.
[0042] In drainage systems:
[0043] The drain pipe 210 is made of HDPE material (nominal diameter 50mm), with uniform through holes (hole diameter 3mm) on the surface. The pipe body is placed at an angle (slope 12.5°) and passes through the rubber sleeve 112 through the opening of the model box 110. Both ends of the drain pipe 210 are open and extend 100-150mm outside the model box 110.
[0044] Geotextile 333 is wrapped around the through-hole area of drainage pipe 210 (covering all through-holes), and the surface is tied and fixed by several cable ties 211 (ensuring that geotextile 333 is tightly attached to the surface of drainage pipe 210 without gaps);
[0045] There are two measuring cups 444, made of glass, with a measuring range of 500-1000mL. They are placed below the two open ends of the drain pipe 210 to collect the permeate.
[0046] Test procedure flow:
[0047] I. Sample Preparation and Loading
[0048] Cut a 90cm section of drain pipe 210;
[0049] The geotextile 333 sample was tightly wrapped and fixed to the outside of the drainage pipe 210 with cable ties 211 to cover the through holes on the surface of the drainage pipe 210, thus reproducing the wrapping state in the actual project.
[0050] The "Geotextile 333-Drainage Pipe 210" assembly is sealed and installed inside the model box 110. A rubber sleeve 112 and waterproof glass glue are installed at the opening between the drainage pipe 210 and the model box 110 to prevent seepage, ensuring that water must pass through the geotextile 333 and then through the through hole on the surface of the drainage pipe 210 before entering the interior of the drainage pipe 210.
[0051] II. Establishing a constant water head
[0052] Turn on the water inlet pump 111 to supply water to the model box 110 from the water supply pipeline;
[0053] Adjust the inlet valve of water pump 111 to stabilize the water level in the infiltration chamber at a fixed water level mark, i.e., maintain a constant water head ΔH. At this time, the water pressure difference acting on the geotextile 333 sample is fixed.
[0054] III. Measuring Seepage Flow Rate (Q)
[0055] After water enters the model box 110, the water begins to seep into the drainage pipe 210 through the geotextile 333 and flows out from the open end.
[0056] Once the water flow stabilizes and the outflow rate becomes constant, the formal measurement begins. The formal measurement procedure involves using a measuring cup 444 of known volume to collect the water flow at the open end of the drain pipe 210, while simultaneously using a stopwatch to record the time t required to collect a certain volume of water. Alternatively, the total volume Q of water flowing out within a fixed unit time t can be directly measured.
[0057] IV. Calculate the hydraulic conductivity (k)
[0058] Because the drainage velocity in drain pipe 210 is relatively high, Darcy's law does not apply. Therefore, the measured water volume Q and unit time t are plotted as a graph (see attached figure). Figure 4 The saturated hydraulic conductivity of the current "Geotextile 333-Drainage Pipe 210" combination is when the drainage volume is basically stable per unit time.
[0059] V. Repeated Testing
[0060] The accuracy can be improved by taking the average value after repeated measurements at the same water head.
[0061] It is also possible to adjust different constant water heads ΔH to perform multiple measurements and obtain more comprehensive performance data.
[0062] In this specification, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
Claims
1. A kind of drainage pipe outer wrapping geotextile water conductivity measuring device, it is characterized in being: Including water supply mechanism (100), the water supply mechanism (100) includes open model box (110) and water pump (111) of water supply to it; Including drainage mechanism (200), the drainage mechanism (200) includes the drainage pipe (210) being penetrated to the model box (110) as a whole, and the surface distribution of several through holes, and the geotextile (333) is wound in the through hole area of drainage pipe (210) and is water retaining; And, the measuring cup (444) being placed in the water area of drainage pipe (210), the water that the drainage pipe (210) flows is received.
2. The drain wrapping geotextile hydraulic conductivity measuring device of claim 1, wherein: The model box (110) is transparent component.
3. The drain wrapping geotextile hydraulic conductivity measuring device of claim 2, wherein: The water pump (111) is marked with several water level lines along Y axis on the surface.
4. The drain wrapping geotextile hydraulic conductivity measuring device of claim 3, wherein: The water outlet pipe of water pump (111) is equipped with flowmeter.
5. The drain wrapping geotextile hydraulic conductivity measuring device of claim 1 or 4, wherein: The through hole area of model box (110) being penetrated by drainage pipe (210) is equipped with rubber sleeve (112), and is coated with waterproof glass glue in the through hole area.
6. The drain wrapping geotextile hydraulic conductivity measuring device of claim 5, wherein: The drainage pipe (210) is inclined.
7. The drain wrapping geotextile hydraulic conductivity measuring device of claim 6, wherein: The measuring cup (444) is placed under both open end of drainage pipe (210).
8. The drain wrapping geotextile hydraulic conductivity measuring device of claim 7, wherein: The surface of geotextile (333) is bound with several straps (211), so that geotextile (333) is closely attached to the surface of drainage pipe (210).