WO2022174830A1 - 地下水环境监测井建井方法 - Google Patents

地下水环境监测井建井方法 Download PDF

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Publication number
WO2022174830A1
WO2022174830A1 PCT/CN2022/077103 CN2022077103W WO2022174830A1 WO 2022174830 A1 WO2022174830 A1 WO 2022174830A1 CN 2022077103 W CN2022077103 W CN 2022077103W WO 2022174830 A1 WO2022174830 A1 WO 2022174830A1
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Prior art keywords
well
hollow
wall
pipe
hollow auger
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PCT/CN2022/077103
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English (en)
French (fr)
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张辰
谭学军
王磊
朱煜
徐伟
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上海市政工程设计研究总院（集团）有限公司
上海申环环境工程有限公司
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Publication of WO2022174830A1 publication Critical patent/WO2022174830A1/zh

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D1/00—Sinking shafts
    • E21D1/03—Sinking shafts mechanically, e.g. by loading shovels or loading buckets, scraping devices, conveying screws
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D5/00—Lining shafts; Linings therefor
    • E21D5/04—Lining shafts; Linings therefor with brick, concrete, stone, or similar building materials
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D5/00—Lining shafts; Linings therefor
    • E21D5/11—Lining shafts; Linings therefor with combinations of different materials, e.g. wood, metal, concrete
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D5/00—Lining shafts; Linings therefor
    • E21D5/12—Accessories for making shaft linings, e.g. suspended cradles, shutterings
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/18—Special adaptations of signalling or alarm devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment

Definitions

  • the invention relates to the field of groundwater environment monitoring, in particular to a well construction method for groundwater environment monitoring.
  • Groundwater environmental monitoring wells are water quality monitoring wells established to investigate the quality of groundwater environment and the dynamic distribution of pollutants in groundwater bodies. They are often used in drinking water sources, mining areas, industrial pollution sources, agricultural pollution sources, and landfills. Groundwater survey and monitoring in other areas. In order to ensure the accuracy of monitoring results, the construction of groundwater environment monitoring wells should meet the requirements of monitoring work, and should not cause too much disturbance to the groundwater flow field, and must not cause secondary pollution to the groundwater environment.
  • groundwater monitoring wells mainly focuses on the design and improvement of monitoring well structures, and there are few studies on the construction and construction methods of environmental monitoring wells.
  • the bottom of the groundwater environment monitoring well needs to go deep below the lowest water level of the groundwater.
  • the diameter of the well wall usually does not exceed 30cm, which has the characteristics of large depth and small diameter.
  • the well wall is prone to local or even overall collapse, especially when the monitoring well is deep or encounters unstable geological conditions such as silty clay.
  • the monitoring well pipe cannot be installed.
  • the representativeness of groundwater sampling will be affected; on the other hand, the quartz sand filter layer between the well tube and the well wall cannot be filled to the set position, and the filtering effect will be lost, and a large number of soil particles will enter the monitoring well, affecting the groundwater quality. .
  • the technical problem to be solved by the present invention is to overcome the defects in the prior art that the well wall is prone to local or even overall collapse, the groundwater is greatly disturbed during the construction of the mud wall protection hole, and the generated mud is prone to secondary pollution.
  • Provided is a method for constructing a groundwater environment monitoring well.
  • a method for building a groundwater environment monitoring well comprising the following steps:
  • the hollow auger is used to form the support of the well hole, and under the support of the hollow auger, the well pipe installation, filter material filling, sealing and water blocking are completed in the hollow through hole of the hollow auger to prevent the well wall from collapsing. Make sure that the filter material and the water-stop material are filled to the set position, and gradually pull out the hollow auger while filling to complete the construction of the well.
  • Using hollow auger as support to replace the traditional mud wall protection method to form holes also avoids the pollution of groundwater, ensures the quality of monitoring well construction and avoids the impact on groundwater.
  • step S2 further includes:
  • the well pipe penetrates into the hollow through hole of the hollow auger and shoots down the one-way blocking block.
  • the one-way blocking block can prevent mud and drilling cuttings from entering the hollow auger.
  • the one-way blocking block can only fall off from the hollow auger, and can be installed when the well pipe is installed after the drilling is completed. Shoot it down to get through the well pipe.
  • step S3 further includes:
  • a small amount of filter material is firstly filled in the annular space so that the bottom of the well pipe is fixed and the well pipe and the hollow auger have a supporting effect under the filling of the filter material. After that, the filter material is further filled and the hollow auger is started to be lifted up, so that the extraction of the hollow auger is more stable and avoids the collapse of the wellbore.
  • the well pipe is sequentially provided with pipe plugs, sedimentation pipes, screen pipes, solid wall pipes and pipe caps from bottom to top.
  • Step S3.1 also includes filling the filter material from the bottom of the sedimentation pipe to the top of the screen pipe. Stop at 50cm.
  • the well pipe is divided into several parts according to their functions.
  • the filter layer can cover the sedimentation pipe and the screen pipe, and the filtering effect is better. .
  • the water-stopping material includes dry bentonite and water-added bentonite
  • step S3.3 further includes first filling the dry bentonite above the filter material, and then filling the water-added bentonite on the dry bentonite.
  • the dry bentonite has strong water absorption, and it can be set on the upper layer of the filter material to better stop the water.
  • step S3.3 further includes filling the upper portion of the filter material with the dry bentonite with a height of not less than 30 cm.
  • the dry bentonite is filled to more than 30cm, which can fully absorb water, and at the same time, the mud wall formed by adding water bentonite to the upper part is fully isolated from the groundwater source, so as to avoid the mud contamination of the water source.
  • step S3.3 also includes filling the top of the dry bentonite with the water-added bentonite to a height of 50cm from the ground.
  • the wellhead is constructed to reinforce the wellhead and to open or close the wellhead.
  • the well platform can be set higher than the ground or flush with the ground.
  • a filter screen is provided around the well pipe.
  • soil particles can be fully intercepted by the double filtration of the filter screen and filter material, the suspended solid content in the monitoring well is low, and the water quality stability is good, which ensures the quality of groundwater sampling.
  • the positive improvement effect of the present invention is: the hollow auger is used to form the support of the well hole, and under the support of the hollow auger, the well pipe installation, filter material filling, sealing and water-stop and other procedures are completed in the hollow through hole of the hollow auger, so as to prevent the wellbore
  • Using hollow auger as support to replace the traditional mud wall protection method to form holes also avoids the pollution of groundwater, ensures the quality of monitoring well construction and avoids the impact on groundwater.
  • FIG. 1 is a schematic flowchart of a method for constructing a groundwater environment monitoring well according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a hollow auger according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a hollow auger in a drilling state according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of the installed state of the well pipe according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of the filling state of the filter material according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of the filling state of the water-stopping material according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of backfilling a concrete slurry layer above the water-stop material according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of the structure of a well pad in an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of the structure of a well pad in another embodiment of the present invention.
  • the method for constructing a groundwater environment monitoring well in this embodiment includes the following steps:
  • Step 100 Use the hollow auger 1 to drill down to form a well hole.
  • the hollow auger 1 in this embodiment is made of steel, with an inner diameter of 10cm-30cm, and each section is 0.5m-2.0m long, and can be connected by threads 2 or snaps, so that the total The length meets the depth requirement of the monitoring well, the outer wall is provided with continuous threads 2, the lower part is provided with a rotary cutting bit, and the bottom is provided with a one-way blocking block 3.
  • the hollow auger 1 is rotated and propelled downward under the action of oil pressure, the soil is brought out of the ground 10 through the thread 2, and the one-way blocking block 3 at the bottom can prevent mud and drill cuttings from entering the hollow auger 1, the one-way blocking block 3 can only fall down from the inside of the hollow auger 1.
  • Step 200 Put the well pipe from the hollow through hole of the hollow auger 1 into the well hole along the axis of the hollow through hole. After the well pipe is put into the specified depth, the one-way blocking block 3 at the bottom of the hollow auger 1 is shot down, then it is straightened and fixed, and the axis of the well pipe is coincident with the axis of the borehole.
  • the well pipe in this embodiment is provided with a pipe plug 9 at the bottom, a sedimentation pipe 8 at the bottom, a drilled or slotted screen pipe 7 in the middle, a seamless solid-wall pipe 6 at the top, and a top with a Tube cap 5.
  • the pipe plug 9, sedimentation pipe 8, screen pipe 7, solid wall pipe 6, and pipe cap 5 are all of the same material, and suitable materials such as stainless steel, polytetrafluoroethylene, and polyvinyl chloride can be selected according to the type of pollutants concerned.
  • the outer wall of the well pipe is wrapped with 2-3 layers of steel mesh or nylon mesh, and the aperture of the steel mesh or nylon mesh is 30 to 50 meshes.
  • the steel wire mesh or nylon mesh is used for double filtration with the filter material 11, which can fully intercept soil particles.
  • the suspended solid content in the monitoring well is low, and the water quality stability is good, which ensures the quality of groundwater sampling.
  • Step 300 Fill a small amount of filter material 11 into the annular space between the inner wall of the hollow auger 1 and the outer wall of the well pipe, and then slowly lift the hollow auger 1 upward while filling the annular space between the inner wall of the hollow auger 1 and the outer wall of the well pipe.
  • the filter material 11 is filled in the space, and the filler flows and fills between the outer wall of the well tube and the well wall 4 through the above-mentioned space.
  • the filling depth of the filter material 11 reaches the bottom of the sedimentation tube 8 to 50cm above the top of the screen tube 7 and stops.
  • the filter material 11 in this embodiment has the characteristics of good sphericity and roundness, clean and pollution-free, the particle size is 1mm to 3mm, and its filling height is from the bottom of the sedimentation tube 8 to the top of the screen tube 7
  • the above 50cm can satisfy the requirement that the filter layer covers the sedimentation tube 8 and the screen tube 7, and the filtering effect is better.
  • a small amount of filter material 11 is first filled in the annular space so that the bottom of the well pipe is fixed and the well pipe and the hollow auger 1 have a supporting effect under the filling of the filter material 11 . After that, the filter material 11 is further filled and the hollow auger 1 is started to be lifted up, so that the extraction of the hollow auger 1 is more stable and the wellbore collapse is avoided.
  • Step 400 Continue to slowly lift the hollow auger 1, and at the same time fill the annular space between the inner wall of the hollow auger 1 and the outer wall of the well pipe with a water-stop material, and the water-stop material flows through the above space and fills the space between the outer wall of the well pipe and the hole wall 4. During the time, the water-stop material is filled to the design height and then stops.
  • the water-stopping material is filled in two stages.
  • the first stage is filled with dry bentonite 12 of not less than 30 cm from the top of the filter material 11 layer, and the second stage is filled with water-added bentonite 13 or bentonite.
  • the slurry continued to be filled to 50cm below the ground 1010.
  • the dry bentonite 12 is filled to more than 30cm, which can fully absorb water.
  • the mud wall formed by adding water bentonite 13 to the upper part is fully isolated from the groundwater source, so as to avoid the mud pollution of the water source.
  • Step 500 Backfill the concrete slurry layer above the water-stop material, build a protective well platform, and set up a sign.
  • the well platform is an obvious well platform 14 , and the length of part of the well pipe on the ground 10 is reserved for 30 cm to 50 cm.
  • This embodiment has the same structure as the above-mentioned embodiment, and the difference lies in:
  • the well platform is a concealed well platform 15 , and the wellhead is flush with the ground 10 .

Abstract

一种地下水环境监测井建井方法，包括如下步骤：S1、使用中空螺旋钻（1）向下钻井孔；S2、将井管自中空螺旋钻（1）的中空通孔中沿中空通孔的轴线放入井孔；S3、向中空螺旋钻（1）的内壁和井管的外壁之间填充滤料（11）和止水材料并取出中空螺旋钻（1）。该方法利用中空螺旋钻（1）形成井孔的支撑，在中空螺旋钻（1）的中空通孔内完成井管安装、滤料填充、密封止水等工序，防止井壁坍塌，确保滤料和止水材料填充至设定位置，在填料的同时抽出中空螺旋钻，取代了传统的泥浆护壁方法成孔，保障了监测井建井质量的同时避免了对地下水的影响。

Description

地下水环境监测井建井方法
本申请要求申请日为2021/2/20的中国专利申请2021101956648的优先权。本申请引用上述中国专利申请的全文。
技术领域
本发明涉及地下水环境监测领域，特别涉及一种地下水环境监测井建井方法。
背景技术
地下水环境监测井是为调查地下水环境质量状况和地下水体中污染物动态分布变化而设立的水质监测井，常用于饮用水水源地、矿山开采区、工业污染源、农业污染源、垃圾填埋场等区域的地下水调查和监测。为保障监测结果的准确性，地下水环境监测井的建设应符合监测工作要求，不应对地下水流场产生太大的扰动，不得对地下水环境产生二次污染。
目前关于地下水监测井的发明主要侧重于监测井结构的设计与改进，针对环境监测井建设与施工方法的研究较少。
地下水环境监测井底部需要深入到地下水最低水位以下，为了减少对地下水流场的扰动，井壁的直径通常不超过30cm，具有深度大、直径小等特点。在监测井建井过程中，井壁极易发生局部甚至整体坍塌现象，在监测井较深或者遇到淤泥质粘土等不稳定地质条件时坍塌现象尤为频繁，一方面会导致监测井管无法安装至设定深度，影响地下水采样的代表性；另一方面会导致井管与井壁间的石英砂过滤层无法填充至设定位置，失去了过滤作用，大量土壤颗粒进入监测井内，影响地下水质量。
为防止深孔坍塌，土建、地勘等行业通常使用泥浆护壁成孔。但泥浆护壁成孔施工过程中对地下水扰动较大，且产生的泥浆极易产生二次污染，不 适用于地下水环境监测井的建设。
发明内容
本发明要解决的技术问题是为了克服现有技术中井壁极易发生局部甚至整体坍塌现象，泥浆护壁成孔施工过程中对地下水扰动较大，且产生的泥浆极易产生二次污染的缺陷，提供一种地下水环境监测井建井方法。
本发明是通过下述技术方案来解决上述技术问题：
一种地下水环境监测井建井方法，其包括如下步骤：
S1、使用中空螺旋钻向下钻井孔；
S2、将井管自所述中空螺旋钻的中空通孔中沿所述中空通孔的轴线放入所述井孔；
S3、向所述中空螺旋钻的内壁和所述井管的外壁之间填充滤料和止水材料并取出所述中空螺旋钻。
在本方案中，利用中空螺旋钻形成井孔的支撑，在中空螺旋钻支撑下在中空螺旋钻的中空通孔内完成井管安装、滤料填充、密封止水等工序，防止井壁坍塌，确保滤料和止水材料填充至设定位置，在填料的同时逐步抽出中空螺旋钻，完成建井。使用中空螺旋钻作为支护取代传统的泥浆护壁方法成孔也避免了对地下水的污染，保障了监测井建井质量的同时避免了对地下水的影响。
较佳的，所述中空螺旋钻底部设有单向封堵块，步骤S2还包括：
S2.1、所述井管深入所述中空螺旋钻的所述中空通孔并将所述单向封堵块击落。
在本方案中，单向封堵块可防止泥浆和钻屑进入中空螺旋钻内部，同时，单向封堵块仅可由中空螺旋钻内部向下脱落，可在钻孔完成后在安装井管时将其击落打通井管。
较佳的，步骤S3还包括：
S3.1、向所述中空螺旋钻的内壁和上所述井管的外壁之间的环形空间中填充少量所述滤料；
S3.2、一边向上提升所述中空螺旋钻，一边继续向所述中空螺旋钻内壁和所述井管外壁之间的环形空间中填充所述滤料；
S3.3、继续提升所述中空螺旋钻，同时向所述中空螺旋钻内壁和所述井管外壁之间的环形空间中填充所述止水材料。
在本方案中，先在环形空间内填充少量滤料以使得井管的底部固定且井管和中空螺旋钻在滤料填充下有支撑效果。之后，再进一步填充滤料并开始上提中空螺旋钻，使得中空螺旋钻的取出更为稳定避免井孔坍塌。
较佳的，所述井管由下至上依次设有管堵、沉淀管、筛管、实壁管和管帽，步骤S3.1还包括将滤料填充至从沉淀管底部到筛管顶部以上50cm时停止。
在本方案中，井管中的根据其功能分为若干部分，将滤料填充至从沉淀管底部到筛管顶部以上50cm时可满足将过滤层覆盖住沉淀管和筛管，过滤效果更佳。
较佳的，所述止水材料包括干膨润土和加水膨润土，步骤S3.3还包括先在所述滤料上方填充所述干膨润土，后在所述干膨润土上填充所述加水膨润土。
在本方案中，通过先填充干膨润土后填充加水膨润土，干膨润土具有较强吸水性，设置在滤料上层可更好的起到止水效果，加水膨润土和泥沙掺和形成泥浆护壁。
较佳的，步骤S3.3还包括在所述滤料上部填充不小于30cm高度的所述干膨润土。
在本方案中，干膨润土填充到30cm以上，可充分吸水，同时将上部加水膨润土形成的泥浆护壁与地下水源充分隔离，避免泥浆污染水源。
较佳的，步骤S3.3还包括在所述干膨润土上部填充所述加水膨润土至 离地面50cm高度。
在本方案中，可在形成泥浆护壁的同时给回填混凝土浆层留出空间。
较佳的，还包括如下步骤：
S4、在所述止水材料上方回填混凝土浆层并建造井台。
在本方案中，建造井台可加固井口并可打开或封闭井口。
较佳的，所述井台可被设置为高于地面或与地面齐平。
较佳的，所述井管周围设有过滤网。
在本方案中，通过过滤网和滤料的双重过滤可充分拦截土壤颗粒，监测井内悬浮固体含量低，水质稳定性好，保障了地下水采样质量。
本发明的积极进步效果在于：利用中空螺旋钻形成井孔的支撑，在中空螺旋钻支撑下在中空螺旋钻的中空通孔内完成井管安装、滤料填充、密封止水等工序，防止井壁坍塌，确保滤料和止水材料填充至设定位置，在填料的同时逐步抽出中空螺旋钻，完成建井。使用中空螺旋钻作为支护取代传统的泥浆护壁方法成孔也避免了对地下水的污染，保障了监测井建井质量的同时避免了对地下水的影响。
附图说明
图1为本发明一实施例的地下水环境监测井建井方法流程示意图。
图2为本发明一实施例的中空螺旋钻的结构示意图。
图3为本发明一实施例的中空螺旋钻的在钻孔状态的结构示意图。
图4为本发明一实施例的井管的安装状态的结构示意图。
图5为本发明一实施例的滤料填充状态的结构示意图。
图6为本发明一实施例的止水材料填充状态的结构示意图。
图7为本发明一实施例的在止水材料上方回填混凝土浆层的结构示意图。
图8为本发明一实施例中井台结构示意图。
图9为本发明另一实施例中井台结构示意图。
附图标记说明：
中空螺旋钻1
螺纹2
单向封堵块3
井壁4
管帽5
实壁管6
筛管7
沉淀管8
管堵9
地面10
滤料11
干膨润土12
加水膨润土13
明显式井台14
隐蔽式井台15
具体实施方式
下面通过实施例的方式进一步说明本发明，但并不因此将本发明限制在的实施例范围之中。
实施例1
如图1所示，本实施例的地下水环境监测井建井方法，包括如下步骤：
步骤100：使用中空螺旋钻1向下进行钻孔形成井孔。
如图2、3所示，本实施例中的中空螺旋钻1其材质为钢质，内径为10cm～30cm，每段长0.5m～2.0m，可采用螺纹2或卡扣进行连接，使总长度达 到监测井深度要求，其外壁有连续螺纹2，下部有旋切钻头，底部设有单向封堵块3。在钻孔过程中，中空螺旋钻1在油压压力作用下向下旋转推进，土壤通过螺纹2被带出地面10，其底部的单向封堵块3可防止泥浆和钻屑进入中空螺旋钻1内部，该单向封堵块3只能从中空螺旋钻1内部向下脱落。
步骤200：将井管自中空螺旋钻1的中空通孔中沿中空通孔的轴线放入井孔。井管放入至指定深度后击落中空螺旋钻1底部的单向封堵块3后，将其扶正、固定，并使井管轴心与钻孔轴心重合。
如图4所示，本实施例中的井管其底部设有管堵9，下部为沉淀管8，中部为钻孔或者割缝筛管7，上部为无缝实壁管6，顶部设有管帽5。其管堵9、沉淀管8、筛管7、实壁管6、管帽5材质均相同，可根据关注污染物类型选择不锈钢、聚四氟乙烯、聚氯乙烯等适宜材质。而井管外壁包裹有2～3层的钢丝网或尼龙网，钢丝网或尼龙网的孔径为30～50目。钢丝网或尼龙网用于和滤料11同时双重过滤可充分拦截土壤颗粒，监测井内悬浮固体含量低，水质稳定性好，保障了地下水采样质量。
步骤300：向中空螺旋钻1内壁和井管外壁之间的环形空间中填充少量滤料11，然后一边缓慢向上提升中空螺旋钻1，一边向中空螺旋钻1内壁和井管外壁之间的环形空间中填倒滤料11，填料通过上述空间流动填充在井管外壁与井壁4之间，滤料11填充深度达到沉淀管8底部到筛管7顶部以上50cm后停止。
如图5所示，本实施例中的滤料11，具有球度与圆度好、清洁无污染的特点，粒径为1mm～3mm，其填充高度为从沉淀管8底部到筛管7顶部以上50cm，可满足将过滤层覆盖住沉淀管8和筛管7，过滤效果更佳。在填充过程中，提升中空螺旋钻1时应采取措施防止滤料11架空。先在环形空间内填充少量滤料11以使得井管的底部固定且井管和中空螺旋钻1在滤料11填充下有支撑效果。之后，再进一步填充滤料11并开始上提中空螺旋钻1，使 得中空螺旋钻1的取出更为稳定避免井孔坍塌。
步骤400：继续缓慢提升中空螺旋钻1，同时向中空螺旋钻1内壁和井管外壁之间的环形空间中填充止水材料，止水材料通过上述空间流动填充在井管外壁与孔壁4之间，止水材料填充至设计高度后停止。
如图6、7所示，本实施例中，止水材料分两段进行填充，第一段从滤料11层顶部向上填充不小于30cm的干膨润土12，第二段采用加水膨润土13或膨润土浆继续填充至地面1010下50cm处。通过先填充干膨润土12后填充加水膨润土13，干膨润土12具有较强吸水性，设置在滤料11上层可更好的起到止水效果，加水膨润土13和泥沙掺和形成泥浆护壁。干膨润土12填充到30cm以上，可充分吸水，同时将上部加水膨润土13形成的泥浆护壁与地下水源充分隔离，避免泥浆污染水源。加水膨润土13填充至离地面1050cm高度。可在形成泥浆护壁的同时给回填混凝土浆层留出空间。
步骤500：止水材料上方回填混凝土浆层，建设保护性的井台，并设置标识牌。
如图8所示，本实施例中，井台为明显式井台14，在地面10上部分井管长度保留30cm～50cm。
实施例2
本实施例与上述实施例结构相同，其区别部分在于：
如图9所示，本实施例中，井台为隐蔽式井台15，井口与地面10齐平。
虽然以上描述了本发明的具体实施方式，但是本领域的技术人员应当理解，这仅是举例说明，本发明的保护范围是由所附权利要求书限定的。本领域的技术人员在不背离本发明的原理和实质的前提下，可以对这些实施方式做出多种变更或修改，但这些变更和修改均落入本发明的保护范围。

Claims (10)

  1. 一种地下水环境监测井建井方法，其特征在于，其包括如下步骤：
    S1、使用中空螺旋钻向下钻井孔；
    S2、将井管自所述中空螺旋钻的中空通孔中沿所述中空通孔的轴线放入所述井孔；
    S3、向所述中空螺旋钻的内壁和所述井管的外壁之间填充滤料和止水材料并取出所述中空螺旋钻。
  2. 如权利要求1所述的地下水环境监测井建井方法，其特征在于，所述中空螺旋钻底部设有单向封堵块，步骤S2还包括：
    S2.1、所述井管深入所述中空螺旋钻的所述中空通孔并将所述单向封堵块击落。
  3. 如权利要求1、权利要求2中任一项所述的地下水环境监测井建井方法，其特征在于，步骤S3还包括：
    S3.1、向所述中空螺旋钻的内壁和上所述井管的外壁之间的环形空间中填充少量所述滤料；
    S3.2、一边向上提升所述中空螺旋钻，一边继续向所述中空螺旋钻内壁和所述井管外壁之间的环形空间中填充所述滤料；
    S3.3、继续提升所述中空螺旋钻，同时向所述中空螺旋钻内壁和所述井管外壁之间的环形空间中填充所述止水材料。
  4. 如权利要求3所述的地下水环境监测井建井方法，其特征在于，所述井管由下至上依次设有管堵、沉淀管、筛管、实壁管和管帽，步骤S3.1还包括将滤料填充至从沉淀管底部到筛管顶部以上50cm时停止。
  5. 如权利要求3、权利要求4中任一项所述的地下水环境监测井建井方法，其特征在于，所述止水材料包括干膨润土和加水膨润土，步骤S3.3还包括先在所述滤料上方填充所述干膨润土，后在所述干膨润土上填充所述加水 膨润土。
  6. 如权利要求5所述的地下水环境监测井建井方法，其特征在于，步骤S3.3还包括在所述滤料上部填充不小于30cm高度的所述干膨润土。
  7. 如权利要求6所述的地下水环境监测井建井方法，其特征在于，步骤S3.3还包括在所述干膨润土上部填充所述加水膨润土至离地面50cm高度。
  8. 如权利要求1-7中至少一项所述的地下水环境监测井建井方法，其特征在于，还包括如下步骤：
    S4、在所述止水材料上方回填混凝土浆层并建造井台。
  9. 如权利要求8所述的地下水环境监测井建井方法，其特征在于，所述井台可被设置为高于地面或与地面齐平。
  10. 如权利要求1-9中至少一项所述的地下水环境监测井建井方法，其特征在于，所述井管周围设有过滤网。
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