Penetrated rainwater inspection well

Abstract

The utility model relates to a rainwater seepage inspection well. The permeable rainwater inspection well comprises a shaft body, a gravel layer, permeable geotechnical cloth, a coarse sand layer, a water inlet pipe, a water outlet pipe and a well lid, the shaft body is an open barrel, and a plurality of permeable drainage holes are evenly distributed in the side wall of the middle section of the shaft body so that rainwater can flow out of the permeable drainage holes conveniently; meanwhile, sand grains or inorganic particles in the rainwater are precipitated at the bottom of the shaft body; a gravel layer is arranged on the periphery of the shaft body side wall of the permeable chamber; permeable geotextile is arranged on the side, away from the shaft body, of the gravel layer; a coarse sand layer is arranged on one side, away from the gravel layer, of the permeable geotextile; the water inlet pipe and the water outlet pipe are arranged on the opposite side walls of the shaft body, the water inlet pipe is arranged above the permeation drainage holes, and the water outlet pipe is arranged above the water inlet pipe. The well lid covers the opening of the shaft body. The seepage rainwater inspection well is easy and convenient to maintain, only the bottom needs to be cleaned regularly, and the seepage drainage holes are prevented from being blocked.

Description

Technical Field

[0001] The utility model relates to the field of urban drainage systems, and more particularly to a permeable rain inspection well. Background Art

[0002] In the construction of sponge cities, permeable rain inspection wells play a crucial role. They ensure the rational utilization of rainwater and the replenishment of groundwater resources in an efficient and environmentally friendly manner. As a dedicated permeable rainwater facility in the "infiltration, retention, storage, purification, utilization, and drainage" technical system of sponge city construction in China, permeable rain inspection wells can achieve rapid infiltration of rainwater in the catchment area, effectively reduce the total runoff volume and peak value, relieve the drainage pressure, and conserve groundwater resources. They have important engineering application value in urban low-lying areas with difficult vertical transformation or areas with imperfect pipe networks and no drainage outlets. Rainwater infiltration is an effective method for rainwater utilization and groundwater recharge.

[0003] Existing inspection wells can infiltrate rainwater by opening permeation holes on the well barrel. Sand grains or other inorganic particles with a relatively large specific gravity in the rainwater are likely to block the permeation holes for rainwater infiltration, affecting the normal operation and infiltration efficiency of the inspection wells. Summary of the Invention

[0004] The technical problem to be solved by the utility model is that existing inspection wells can infiltrate rainwater by opening permeation holes on the well barrel, and sand grains or other inorganic particles with a relatively large specific gravity in the rainwater are likely to block the permeation holes for rainwater infiltration, affecting the normal operation and infiltration efficiency of the inspection wells.

[0005] To solve the above technical problem, according to the utility model, a permeable rain inspection well is provided, which includes a well barrel body, a gravel layer, a permeable geotextile, a coarse sand layer, an inlet pipe, an outlet pipe, and a manhole cover.

[0006] The well barrel body is an open cylinder, and the side wall of the middle section of the well barrel body is provided with a plurality of uniformly distributed permeation and drainage holes, facilitating the outflow of rainwater from the permeation and drainage holes. At the same time, sand grains or inorganic particles in the rainwater precipitate at the bottom of the well barrel body.

[0007] A gravel layer is arranged on the periphery of the side wall of the well barrel body of the permeable chamber.

[0008] A permeable geotextile is arranged on the side away from the well barrel body of the gravel layer.

[0009] A coarse sand layer is arranged on the side away from the gravel layer of the permeable geotextile.

[0010] The inlet pipe and the outlet pipe are arranged on the opposite side walls of the well barrel body. The inlet pipe is arranged above the permeation and drainage holes, and the outlet pipe is arranged above the inlet pipe.

[0011] The manhole cover is installed on the opening of the wellbore body.

[0012] Among them, the wellbore body is successively provided with a sand settling chamber and a permeable chamber from bottom to top. The sand settling chamber is located at the bottom of the wellbore body and is used for precipitating sand grains or inorganic particles in water. The permeable chamber communicates with the sand settling chamber. The permeable chamber is located in the middle section of the wellbore body. The side wall of the wellbore body of the permeable chamber is provided with uniformly distributed permeable drainage holes to facilitate rainwater to flow out from the permeable drainage holes.

[0013] Preferably, the wellbore body is integrally formed by pressing HDPE (high density polyethylene) material once.

[0014] Preferably, the gravel diameter of the gravel layer is 20 mm to 30 mm.

[0015] Preferably, the thickness of the gravel layer is greater than or equal to 200 mm.

[0016] Preferably, the permeable geotextile is a non-woven geotextile, and the mass per unit area is 100 - 300 g / m2.

[0017] Preferably, the distance between the permeable drainage holes and the bottom of the wellbore body is greater than or equal to 0.3 m, that is, the height of the sand settling chamber is 0.3 m.

[0018] Preferably, the manhole cover is made of SMC (sheet molding compound).

[0019] Preferably, the manhole cover is provided with openings for draining water.

[0020] Preferably, the manhole cover is provided with grooves.

[0021] Preferably, the groove is a trapezoidal groove.

[0022] Compared with the prior art, the technical solutions provided by the embodiments of the present utility model can at least achieve the following beneficial effects:

[0023] First, the permeable rain inspection well is equipped with the sand settling chamber, which is convenient for cleaning sundries such as gravel and garbage, prevents the blockage of the rainwater pipeline, and changes the serious pipeline blockage problem of the traditional well. The maintenance work is simple, and only the sand settling chamber needs to be cleaned regularly to avoid the blockage of the permeable drainage holes.

[0024] Second, the wellbore body is integrally formed by HDPE material. The HDPE raw material has good corrosion resistance, high load-bearing strength, safety and reliability, long service life, impact resistance, extrusion resistance, wear resistance, good stress cracking resistance, good chemical corrosion resistance, and good toughness, tensile resistance and deformation resistance, etc.

[0025] Third, efficient drainage. The inner wall of the wellbore body is smooth and has little water flow resistance, high discharge efficiency, making its discharge efficiency far exceed that of traditional wells. At the same time, the construction is convenient, improving work efficiency. The pipeline is easy to clean and has little maintenance.

[0026] Fourth, the infiltration well made of HDPE material is light in weight, easy to transport and install, reliable in performance, complete in variety, strong in adaptability, and convenient to install. The wellbore height can be customized and holes can be drilled at appropriate positions on the well body to adapt to various installation depth requirements. Even in harsh environments, its flexibility can be demonstrated. The construction is convenient and fast, greatly improving the construction progress, shortening the construction period, and saving a lot of time and labor costs.

[0027] Fifth, the HDPE plastic well uses environmentally friendly materials, can be recycled, and has great social benefits.

[0028] Sixth, the SMC sunken manhole cover has high mechanical strength, light material weight, corrosion resistance, long service life, high insulation strength, arc resistance, flame retardancy, good sealing performance, and flexible product design, easy for large-scale production, and has the advantages of safety and beauty. It has all-weather protection function and can meet the needs of various harsh environments and places in outdoor engineering projects.

[0029] Seventh, the gravel layer serves as a storage volume to store the rainwater during the runoff period; during heavy rainfall, if the rainwater can be temporarily stored, the impact on the urban drainage system in a short time can be reduced, and the risk of waterlogging can be lowered.

[0030] Eighth, the manhole cover is a grass-planting manhole cover, making the manhole cover consistent with the surrounding greening style. When the seasons change, the color and form of the turf can also be changed by adjusting and replacing different cover bodies to adjust in time to match the seasonal greening effect. Brief Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention and do not limit the present invention.

[0032] Figure 1 It is a cross-sectional view of an infiltration rain inspection well provided for this embodiment. Detailed Embodiment

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Apparently, the described embodiments are only a part rather than all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0034] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which the present utility model pertains. The terms "first", "second" and similar terms used in the specification and claims of the patent application of the present utility model do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms "a" or "one" and the like do not denote a limitation in quantity, but rather denote the presence of at least one.

[0035] Reference Figure 1 , this embodiment provides a permeable rainwater inspection well, which includes a wellbore body 11, a gravel layer 12, a permeable geotextile 13, a coarse sand layer 14, an inlet pipe 15, an outlet pipe 16 and a manhole cover 17.

[0036] The wellbore body 11 is an open cylinder. Preferably, the wellbore body 11 is integrally formed by one-time pressure bearing with HDPE material, and has a strong structure. The integrity of the wellbore of the permeable rainwater inspection well is an important factor to ensure the normal operation of the water infiltration inspection well. The integrity of the wellbore includes the integrity of the wellbore wall and the sealing of the bottom of the well. The wellbore body 11 adopts a solid wall or rib-reinforced structure, and the wall thickness and material properties shall comply with the provisions of "Plastic Inspection Wells for Municipal Drainage" (CJ / T 326). The wellbore body is integrally formed with HDPE material. HDPE raw materials have good corrosion resistance, high load-bearing strength, safety and reliability, long service life, impact resistance, extrusion resistance, abrasion resistance, good stress cracking resistance, good chemical corrosion resistance, and good toughness, tensile strength and anti-deformation. The inner wall of the wellbore body is smooth and has small water flow resistance and high discharge efficiency, so that its discharge efficiency far exceeds that of traditional wells. At the same time, the construction is convenient, which improves work efficiency. The pipeline is convenient to clean and has little maintenance. The permeable well made of HDPE material is light in weight, easy to transport and install, reliable in performance, complete in variety, strong in adaptability and convenient to install. The wellbore height can be customized and holes can be drilled at appropriate positions on the well body to meet various installation depth requirements. Even in harsh environments, its flexibility can be demonstrated. The construction is convenient and fast, which greatly improves the construction progress, shortens the construction period, and greatly saves time and labor costs. The HDPE plastic well uses environmentally friendly materials and can be recycled, which has great social benefits.

[0037] A plurality of uniformly distributed permeable drainage holes 1111 are provided on the side wall of the middle section of the wellbore body 11. The distance between the permeable drainage holes 1111 and the bottom of the wellbore body is greater than 0.2 m, facilitating the outflow of rainwater from the permeable drainage holes. At the same time, sand grains or inorganic particles in the rainwater precipitate at the bottom of the wellbore body. Specifically, a sand settling chamber 112 and a permeable chamber 111 are sequentially arranged in the wellbore body 11 from bottom to top. The sand settling chamber 112 is located at the bottom of the wellbore body 11 and is used to precipitate sand grains or inorganic particles in the water. Preferably, the height of the sand settling chamber 112 is 0.3 m. During the discharge of rainwater runoff, a certain amount of debris will be mixed. The sand settling chamber 112 effectively removes sand grains or other inorganic particles with a relatively large specific gravity in the water by means of gravity separation and natural sedimentation. The sand settling chamber 112 needs to be cleaned regularly to avoid blocking the filter layer outside the wellbore and ensure the effect of rainwater infiltration.

[0038] The permeable chamber 111 communicates with the sand settling chamber 112. The permeable chamber 111 is located in the middle section of the wellbore body 11. Permeable drainage holes 1111 are uniformly distributed on the side wall of the wellbore body 11 of the permeable chamber 111, facilitating the outflow of rainwater from the permeable drainage holes 1111. The ring stiffness of the wellbore body 11 after opening the holes should meet the requirement of resisting the lateral earth pressure.

[0039] A gravel layer 12 is arranged around the side wall of the wellbore body 11 of the permeable chamber 111. The thickness of the gravel layer 12 is greater than or equal to 200 mm, and the gravel diameter is 20 mm - 30 mm. The rainwater in the inspection well enters the gravel layer 12 outside the wellbore through the permeable drainage holes 1111 on the wellbore body 11. The gravel layer 12 has a certain water storage and regulation function and then further infiltrates into the surrounding soil. The outside of the wellbore body 11 is filled with gravel, which has a relatively large water storage space. The gravel outside the wellbore body 11 is filled in layers according to a single particle size, and the coarse and fine materials shall not be mixed and filled; crushed stones or pebbles shall be filled within the range of the lower permeable layer, and sand or gravel shall be filled within the range of the upper impermeable layer. The wellbore body 11 is the core part of the permeable rainwater inspection well, so it must have good stability. The gravel layer 12 outside the wellbore body 11 can make the inspection well more firm and stable during use, avoiding the occurrence of situations such as the sinking and tilting of the wellbore body 11, thereby ensuring the normal use of the permeable rainwater inspection well.

[0040] On the side of the gravel layer 12 away from the wellbore body 11, a permeable geotextile 13 is provided. Preferably, the permeable geotextile 13 is a non-woven geotextile with a unit area mass of 100 - 300 g / m2. Its permeability performance should be greater than the maximum water seepage requirement of the covered seepage facilities and should meet the requirements of soil retention, water permeability, and anti-blocking properties. A short fiber needle-punched geotextile can be selected. The short fiber needle-punched geotextile is one of the most widely used non-woven geotextiles at present. The fibers are opened, mixed, carded (or air-laid) into a web, laid, drawn, and needle-consolidated to finally form a finished product. The entanglement strength formed by needle punching is sufficient to meet the tensile stress during laying and will not cause tearing or punching. Due to its relatively large thickness, fluffy structure, and three-dimensional fiber channels, it has high filtration efficiency and good drainage performance. Its permeability coefficient reaches 10-2 - 10-1, which is comparable to that of sand filter materials, but it is more convenient to lay and not expensive, so it is most suitable for use as an anti-filtration and drainage material. It also has certain strengthening and isolation functions and can be compounded with other geosynthetics to have multiple functions such as protection.

[0041] On the side of the permeable geotextile 13 away from the gravel layer 12, a coarse sand layer 14 is provided.

[0042] The inlet pipe 15 is connected to the upstream rain inspection well or rain inlet, and the outlet pipe 16 is connected to the downstream rain inspection well. Both the inlet pipe 15 and the outlet pipe 16 are made of HDPE plastic pipes. The inlet pipe 15 and the outlet pipe 16 are arranged on the opposite side walls of the wellbore body 11. The inlet pipe 15 is arranged above the permeable chamber 111, and the outlet pipe 16 is arranged above the inlet pipe 15. The elevation of the outlet pipe 16 of the permeable rain inspection well should be higher than the elevation of the inlet of the inlet pipe 15, but should not be higher than the elevation of the outlet of the upstream adjacent well. The diameter of the rain outlet pipe 16 shall not be less than the diameter of the rain inlet pipe 15. Preferably, both the inlet pipe 15 and the outlet pipe 16 are made of HDPE plastic pipes.

[0043] The manhole cover 17 covers the opening of the wellbore body 11. The manhole cover 17 is made of SMC and formed by one-time high-temperature compression molding. The shape of the manhole cover 17 is provided with a groove, and the groove is a trapezoidal groove. For example, the shape of the groove of the manhole cover is similar to the concave part under a flower pot. The manhole cover 17 is provided with openings for drainage. The manhole cover 17 can also be grassed. Soil is filled in the groove, and suitable flowers and plants are cultivated, etc., which can play the role of greening the environment and beautifying the landscape. The original manhole cover is decorated by the turf covering the upper part of the manhole cover 17, so that the manhole cover 17 is consistent with the surrounding greening style. When the seasons change, different manhole covers can also be adjusted and replaced to change the color and shape of the turf, and adjusted in time to match the greening effect of the season, preferably with green dye. The SMC concave manhole cover has the advantages of high mechanical strength, light material weight, corrosion resistance, long service life, high insulation strength, arc resistance, flame retardancy, good sealing performance, flexible product design, easy large-scale production, and safety and beauty. It has an all-weather protection function and can meet the needs of various harsh environments and places in outdoor engineering projects.

[0044] The working principle of the infiltration rain inspection well is as follows:

[0045] The rainwater entering the infiltration rain inspection well includes surface rainwater and direct rainfall, and the buried infiltration facility cannot receive direct rainfall. When the rainwater flow rate is less than the infiltration flow rate or infiltration capacity of the infiltration facility, there is no flowing water or ponding in the infiltration facility. As the rainwater inflow increases, once it exceeds the infiltration flow rate, flow and ponding will start. Then, as the rainfall gradually decreases, the rainwater inflow will become less than the infiltration flow rate again, and the flow stops. The accumulated rainwater during the flow period (also known as the flow duration) should not be lost and needs to be stored and infiltrated later. Therefore, a gravel layer is externally provided in the infiltration rain inspection well as a storage volume to store the accumulated rainwater during the flow duration, reduce the impact on the urban drainage system in a short time, and reduce the risk of waterlogging.

[0046] The above is only an exemplary embodiment of the present invention and is not used to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. An infiltration rainwater inspection well, characterized in that, It includes a wellbore body, a gravel layer, a permeable geotextile, a coarse sand layer, an inlet pipe, an outlet pipe and a manhole cover. The wellbore body is an open cylinder. A plurality of uniformly distributed infiltration drainage holes are provided on the side wall of the middle section of the wellbore body, facilitating the outflow of rainwater from the infiltration drainage holes. At the same time, sand grains or inorganic particles in the rainwater precipitate at the bottom of the wellbore body. A gravel layer is arranged on the periphery of the side wall of the middle section of the wellbore body. A permeable geotextile is arranged on the side away from the wellbore body of the gravel layer. A coarse sand layer is arranged on the side away from the gravel layer of the permeable geotextile. The inlet pipe and the outlet pipe are arranged on the opposite side walls of the wellbore body. The inlet pipe is arranged above the infiltration drainage holes, and the outlet pipe is arranged above the inlet pipe. The manhole cover is covered on the opening of the wellbore body.

2. The infiltration rainwater inspection well according to claim 1, wherein, The wellbore body is formed by one-time pressure molding with HDPE material.

3. The infiltration rainwater inspection well according to claim 1, characterized in that, The gravel diameter of the gravel layer is 20mm to 30mm.

4. The permeable rainwater inspection well according to claim 1, characterized in that, The thickness of the gravel layer is greater than or equal to 200mm.

5. The infiltration rainwater inspection well according to claim 1, characterized in that, The permeable geotextile is a non-woven geotextile with a unit area mass of 100 to 300 g / m 2 .

6. The infiltration rainwater inspection well according to claim 1, characterized in that, The distance between the infiltration drainage holes and the bottom of the wellbore body is greater than or equal to 0.3m.

7. The permeable rainwater inspection well according to claim 1, characterized in that, The manhole cover is made of SMC.

8. The infiltration rainwater inspection well according to claim 1, characterized in that, The manhole cover is provided with openings for facilitating drainage.

9. The infiltration rainwater inspection well according to claim 1, characterized in that, The manhole cover is provided with grooves.

10. The infiltration rainwater inspection well according to claim 9, characterized in that, The groove is a trapezoidal groove.

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