JP2016108853A - Construction method for groundwater purification wall with built-in observation well, and input can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method for a groundwater purification wall with a built-in observation well that does not cause a problem in material separation and enables management of the underground purification wall, even when a groundwater purification material comprises a plurality of materials having different specific gravity values.SOLUTION: A construction method for a groundwater purification wall includes the following steps for: inserting a casing 20 into a ground G and erecting an observation well 30 inside the casing; filling a groundwater purification material M in an input can 10 comprising a can body 1 and a lower cover 2 fitted on the can body, after fitting a first hanging wire 4 to the can body 1 and a second hanging wire 3 to the lower cover, then hooking the wires 3, 4 to separate hanging wire hooks 5, 6 of a heavy machinery, then lowering the input can 10 into the observation well 30 without interference, using only the second hanging wire 3, then hanging the input can 10 with the first hanging wire 4, opening the lower cover 2 and dropping the groundwater purification material M, then lifting the input can 10 with the first hanging wire 4, hanging the input can 10 only with the second hanging wire 3, and filling the groundwater purification material M; and repeating the steps for constructing a groundwater purification wall 100.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a method for constructing a groundwater purification wall having a built-in observation well, and a charging can applied to the groundwater purification material, which is applied by this construction method, and placed in a casing.

  In the sites of various chemical factories, chemical factories, parts factories, metal smelting factories, plating factories, etc., groundwater purification walls have been constructed to purify contaminated groundwater.

  As public techniques relating to the construction method of the groundwater purification wall, the construction methods disclosed in Patent Documents 1 and 2 can be cited. The construction method of the underground purification wall disclosed in Patent Document 1 is to drill a cutting hole, insert a monitor into the cutting hole to cut and agitate the ground, and then spray an aqueous solution mixed with a purification material to remove the purification wall portion. The water purifying wall is formed by continuously forming the purifying wall portions formed by repeating these steps in order.

  According to this construction method, it is said that it is possible to reduce the number of processing steps such as cutting and removal when constructing an underground purification wall that is created in the ground and naturally purifies contaminated groundwater. However, since the purification wall is created while cutting and stirring the ground in this way, the reliability of the shape and size of the created purification wall must be extremely low. In addition, a liquid material is essential for the purification material used to construct the purification wall, and there is a problem that the usable purification material is restricted.

  Therefore, as a purification wall forming method capable of improving the reliability of the shape and size of the purification wall, a technique disclosed in Patent Document 2 can be cited. The method for creating a purification wall disclosed herein comprises a plurality of blades that form cones inside a cylindrical member in which a casing is inserted into the ground to form an underground hole therein and the tip extends in a funnel shape. The bag opening device to which the knitted knife is attached is attached to the opening of the casing, and the bag body containing the powder particles such as iron powder is suspended from the hook etc., and the bag opening device is opened from above the opening. The bag body is brought into contact with the blade inside the bag opening device, the bottom surface is radially cut open, the bag is opened, and the granular material is dropped below the underground hole (here, the bag opening device is used). A method for charging a granular material into the ground) is disclosed.

  According to the creation method disclosed in Patent Document 2, an underground hole is formed using a casing, and a purification wall is formed by filling the underground hole with a granular material such as iron powder. The reliability of the shape and size of the purification wall to be created can be increased.

  However, since the bag body is opened by the bag opening device at the upper end of the casing and the powdered material such as iron powder is dropped below the underground hole, the purification material is composed of a mixture of a plurality of materials having different specific gravities. In this case, the material is separated in the process of dropping, and the purification wall cannot be formed with the purification material in which a plurality of materials are sufficiently mixed. Unavoidable.

  By the way, after constructing the groundwater purification wall in the ground, it is necessary to evaluate the performance of the groundwater purification wall constructed in the ground, and to verify the degree of wear of the groundwater purification wall that is worn out over time, It is important to manage the groundwater purification wall, such as predicting the timing. However, in the technical field related to the groundwater purification wall so far, attention has been paid mainly to the construction technology of the groundwater purification wall in the ground, and the development of the management method and management technology of the groundwater purification wall after construction has not been sufficient.

JP 2003-74047 A JP 2008-190152 A

  The present invention has been made in view of the problems described above, and can form a groundwater purification wall with high shape and dimensional accuracy. The groundwater purification material for groundwater purification wall construction is made of a mixture of a plurality of materials having different specific gravities. Even if it is configured, there is no problem of material separation, and furthermore, a method for constructing a groundwater purification wall with a built-in observation well that can also suitably manage the groundwater purification wall after construction, and this construction method An object of the present invention is to provide an input can that is applied in the above-described method and accommodates the groundwater purification material and puts it in a casing.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a method for constructing a groundwater purification wall having a built-in observation well, wherein a casing is inserted into the ground, and the inside of the casing is hollow to form an introduction hole for introducing a groundwater purification material. A second step of building an observation well capable of collecting groundwater in the casing, a hollow can body, and a lower lid attached to the can body so as to be openable and closable. 1 suspending wire is attached and the bottom can is filled with a groundwater purification material in a charging can in which a second suspending wire is attached, and the first suspending wire and the second suspending wire are attached to a separate suspending hook of the heavy machinery. A state where the charging can is hung only by the second hanging wire, the charging can is hung from the charging hole so as not to interfere with the observation well, and the charging can is also suspended from the first hanging wire. After the second hanging wire Release the hanging state of the can and open the lower lid, drop the groundwater purification material into the charging hole, lift the charging can with the first hanging wire above the charging hole, and release the suspended state with the first hanging wire Then, the third step of filling the charging can with the groundwater purification material in the state where the charging can is hung only by the second hanging wire, the third step is repeated, the charging hole is filled with the groundwater purification material, and the casing is pulled out. It consists of a fourth step of creating a groundwater purification wall.

  The method for constructing a groundwater purification wall with a built-in observation well according to the present invention uses a casing to form an introduction hole for introducing groundwater purification material, and by introducing the groundwater purification material into the groundwater purification wall, Therefore, it is possible to create a groundwater purification wall with high shape accuracy. In addition, unlike the method disclosed in Patent Document 2 in which the groundwater purification material is dropped from above the charging hole, the groundwater purification material is transferred to the lower position of the charging hole, and the groundwater purification material is introduced. Even if it consists of a mixture of multiple materials with different specific gravities, it is possible to create a groundwater purification wall with excellent quality with groundwater purification material that does not cause material separation, and therefore is sufficiently mixed with multiple materials. Yes. Furthermore, by constructing an observation well in the casing inserted in the ground and constructing a groundwater purification wall around this observation well, performance evaluation of the groundwater purification wall after construction of the groundwater purification wall and over time It is possible to verify the wear level of the drained groundwater purification wall and predict the renewal time based on the verification result.

  The observation well can be formed, for example, from a steel pipe having a large number of holes. By applying a perforated observation well, groundwater can be collected in the observation well, and the performance of the groundwater purification wall can be verified by analyzing the collected groundwater.

  In addition, a test body for verifying the level of consumption of the groundwater purification material and / or a groundwater intake pipe and / or a flow direction anemometer for detecting the flow direction and flow velocity of the ground water are installed before the observation well is installed. It may be arranged in advance in the well, or may be arranged in the observation well after the observation well is built.

  By placing a test specimen for verifying the level of groundwater purification material in the observation well, it is possible to verify the level of consumption of the groundwater purification material that forms the groundwater purification wall that is consumed over time. Based on this, it is possible to predict the renewal time of the groundwater purification wall.

  In addition, by installing groundwater intake pipes and flow direction anemometers for detecting the flow direction and flow velocity of groundwater in the observation well, the quality of the local groundwater can be verified and the flow direction of groundwater can be detected in real time. Yes, it will lead to confirmation of the purification effect of the groundwater purification wall.

  In addition, as a means to realize the introduction of the groundwater purification material by transporting the groundwater purification material to the lower position of the input hole, an input can of any material is used, and the input can is filled with the groundwater purification material via the hanging wire. It is suspended by a heavy machine and lowered by a suspension wire to a predetermined position below the charging hole. Since the observation well has already been built prior to the introduction of the charging can into the casing, the dropping of the charging can is performed without interfering with the observation well. For example, by arranging a cylindrical observation well at the center position of the casing or at an eccentric position at the end, on the other hand, by arranging a guide tube through which the observation well penetrates, Interference between the observation well and the charging can can be avoided.

  Here, the raw material, shape, and inner dimensions of the charging can are arbitrary, and those having dimensions that fit within the inner diameter of the casing to be used can be applied. For example, as an example of the shape, a disk-shaped lower lid is detachably mounted below the cylindrical can body, and further includes a through-hole through which the observation well penetrates at the center position or the eccentric position of the end, A prismatic, hollow can body is provided with a rectangular lower lid complementary to the cross section of the can body so that it can be freely opened and closed, and further provided with a through-hole through which the observation well passes at the center position or the eccentric position of the end. A form etc. can be mentioned. In addition, the inner dimensions of the input can are the amount of groundwater purification material to be carried at one time, the forming material of the input can (metal such as steel and aluminum, resin including FRP, ceramics, etc.), heavy equipment used It can be set according to the weight of the groundwater purification material that can be transported at one time from the relationship with the scale of the water and the depth of the injection hole. Furthermore, the lower lid that can be freely opened and closed below the can body has a form in which one lower lid is attached to the can body via a hinge structure in one place, and two sheets constituting the lower lid. Examples include a configuration in which each of the divided lids is attached to the can body via a central hinge structure, and both the divided lids open and close like blades via the central hinge structure.

  In the creation method of the present invention, individual suspension wires are attached to both the can body and the lower lid of the charging can, and both suspension wires are connected to, for example, a parent hook (parent wire hook) and a child hook (child) of a single heavy machine. By suspending both the suspension wires on the wire hooks), or by suspending both suspension wires on the suspension hooks of the two heavy machinery, and appropriately adjusting the suspension wires that suspend the input can according to the position of the input can (ie, input) Select a hanging wire that bears the load of the can), suspend the charging can into the charging hole, open and close the lower lid with the charging can suspended, and purify the groundwater with the charging can suspended It is possible to provide materials to cans.

  Specifically, the first hanging wire is attached to the can body, the second hanging wire is attached to the lower lid, and the first hanging wire and the second hanging wire are separated by a separate hanging hook (wire Hook).

  When the charging can is suspended, the charging can is suspended only by the second hanging wire, and is suspended below the charging hole so as not to interfere with the observation well.

  Next, the charging can is stopped at a predetermined position below the charging hole, and the charging can is also suspended by the first hanging wire in order to shift the load burden of the charging can from the second hanging wire to the first hanging wire. State. In this state, by releasing the suspended state of the charging can by the second hanging wire, the lower lid automatically opens and the groundwater purification material is dropped into the charging hole. The position of dropping the groundwater purification material is adjusted to a position of 1 to several meters (for example, about the length of the charging can) from the lower end of the charging hole, for example.

  When the groundwater purification material is dropped by the automatic opening of the lower lid, an empty charging can is lifted above the charging hole while the charging can is suspended by the first hanging wire. Next, the state where the first hanging wire is suspended is released, and the charging can is hung only by the second hanging wire, so that the lower lid is closed again, and the charging can is filled with the groundwater purification material (the above, 3 steps).

  By repeating the third step multiple times for one input hole, the input hole in which the observation well is built is filled with the groundwater purification material, and a groundwater purification wall containing the observation well is created (No. 1). 4 steps).

  Note that the groundwater purification wall created here is a groundwater purification pile whose shape and dimensions are defined by the length and diameter of the casing.

  Therefore, when creating a flat groundwater purification wall in the ground, the groundwater purification wall is created by a method that does not build the observation well in the casing on the side of the groundwater purification wall containing the observation well. That is, the second step of the above-described creation method is not required, and the third step of the above-described creation method is repeated in the casing in which the observation well is not built to create the groundwater purification pile for the groundwater purification wall, A method can be applied in which groundwater purification piles are arranged side by side in order to create a groundwater purification wall that spreads across the ground. In this way, when constructing a groundwater purification wall that spreads across the ground, groundwater purification piles with built-in observation wells are created, and groundwater purification piles without built-in observation wells are attached to the left and right of the piles. Can build walls. Moreover, when the planar dimension of the groundwater purification wall that spreads over a wide area covers a wide range, it may be a groundwater purification wall in which a plurality of groundwater purification piles incorporating observation wells are arranged at predetermined intervals.

  In the first step, a hopper may be placed in the opening of the charging can and the charging can may be filled with groundwater purification material via the hopper. Furthermore, also in the operation of providing the groundwater purification material to the input can again in the third step, the hopper can be placed on the suspended input can and the groundwater purification material can be packed into the input can via the hopper. it can.

  In addition, since the groundwater purification material used in the creation method of the present invention is composed of a mixed material of a plurality of materials having different specific gravity as described above, the groundwater purification material can be dropped into the input hole without material separation. It can be said that this is a suitable material for the production method. Here, examples of the constituent material of the mixed material include activated carbon, iron powder, and crushed stone for ensuring the flow of groundwater. Of course, it is a matter of course that the groundwater purification wall may be constructed using a single material groundwater purification material made only of activated carbon or iron powder.

  In addition, the present invention extends to an input can applied by the above-described creation method, and the input can can be moved up and down in the casing so as not to interfere with an observation well in the casing, and a plurality of different specific gravities. A charging can in which a groundwater purification material made of a mixture of materials is installed in a casing, the charging can having a hollow can body open at the top, and a bottom mounted openably on the can body A hollow guide through which the observation well penetrates, wherein the can body is provided with a suspension wire attachment portion, and the lower lid is provided with a separate suspension wire attachment portion for opening and closing the lower lid. The tube is provided at a central position inside the can body or at an eccentric position at the end.

  By carrying out the above-mentioned preparation method by applying the charging can of the present invention, a plurality of materials having different specific gravities up to a position below the charging hole without interfering with the observation well arranged in advance in the casing. Groundwater purification material made of mixed material can be transported and introduced into the groundwater purification material without causing material separation, and therefore a groundwater purification wall excellent in quality with a groundwater purification material in which multiple materials are sufficiently mixed Can be created.

  As can be understood from the above description, according to the method for constructing a groundwater purification wall having an observation well according to the present invention, a casing is used to form an introduction hole for introducing a groundwater purification material, and the groundwater purification material is provided here. By introducing the groundwater purification wall, it is possible to create a groundwater purification wall with high shape accuracy. In addition, by transporting the groundwater purification material to the position below the input hole and introducing the groundwater purification material, even if the groundwater purification material is composed of a mixture of a plurality of materials having different specific gravities, for example, material separation occurs. Therefore, it is possible to construct a groundwater purification wall excellent in quality using a groundwater purification material in which a plurality of materials are sufficiently mixed. Furthermore, by constructing an observation well in the casing inserted in the ground and constructing a groundwater purification wall around this observation well, performance evaluation of the groundwater purification wall after construction of the groundwater purification wall and over time It is possible to verify the wear level of the drained groundwater purification wall and predict the renewal time based on the verification result.

It is the perspective view which looked at Embodiment 1 of the input can of this invention applied with the construction method of the groundwater purification wall of this invention from diagonally downward. It is the perspective view which showed the state which the lower cover of Embodiment 1 of the input can opened. It is the perspective view which looked at Embodiment 2 of the charging can of this invention from diagonally downward. It is a figure explaining the situation where groundwater purification material is packed in Embodiment 1 of an input can. It is the schematic diagram explaining the 1st step and 2nd step of the construction method of the groundwater purification wall which built the observation well of this invention. FIG. 6 is an enlarged view of a VI part in FIG. 5. It is the schematic diagram explaining the 3rd step of the creation method of this invention. FIG. 8 is a schematic diagram illustrating a third step following FIG. 7. FIG. 9 is a schematic diagram illustrating a third step following FIG. 8. FIG. 10 is a schematic diagram illustrating a third step following FIG. 9. It is the schematic diagram explaining the 4th step of the creation method of this invention, Comprising: It is the schematic diagram explaining the groundwater purification wall (groundwater purification pile) which built the observation well formed. It is a schematic diagram explaining the groundwater purification wall in which the groundwater purification pile with a built-in observation well and the groundwater purification pile without a built-in observation well are juxtaposed.

  Embodiments of a method for constructing a groundwater purification wall incorporating an observation well according to the present invention and Embodiments 1 and 2 of an input can applied by this construction method will be described below with reference to the drawings. The shape and structure of the charging can are not limited to those shown in the drawings, but for example, a charging can having a structure in which a single lower lid is detachably mounted on a prismatic can body. Also good.

(Embodiment 1 of the charging can)
FIG. 1 is a perspective view of a charging can according to a first embodiment of the present invention, which is applied in the method for constructing a groundwater purification wall according to the present invention, as viewed obliquely from below. FIG. It is the perspective view which showed the open state. As shown in FIG. 1, an input can 10 according to the first embodiment is generally configured by a tubular can body 1 made of steel and a lower lid 2 that is attached to the lower end of the can body 1 so as to be freely opened and closed. ing.

  The lower lid 2 is attached to the lower end of the can body 1 via a hinge portion 2c, and from the closed state shown in FIG. 1 to the downward opened state (Y1 direction) shown in FIG. The state can be changed to the closed state (Y1 direction).

  The inside of the can body 1 is a hollow 1a, and a central guide tube 1d through which an observation well described later is inserted is fixed to the inner wall of the can body 1 via a fixing portion 1e. Yes. The central guide tube 1d extends to the lower lid 2. Therefore, the lower lid 2 has an opening extending horizontally to the central guide tube 1d so that the central guide tube 1d does not interfere when the lower lid 2 is opened and closed. 2a has been established. On the other hand, at the lower end of the can body 1, an opening closing piece 1 f having a shape complementary to the opening 2 a is fixed to the inner wall of the can body 1, and when the lower cover 2 shown in FIG. The opening closing piece 1f is fitted into the opening 2a so that no gap is formed. Therefore, when the space between the hollow 1a of the can main body 1 and the central guide tube 1d is filled with a groundwater purification material, which will be described later, the groundwater purification material is prevented from falling downward via the lower lid 2, and the groundwater The purification material is dropped only when the lower lid 2 is opened.

  A guide pin 1b for guiding the second suspension wire 3 is attached to the inner surface facing the hollow 1a, and a suspension pin 1c for hooking the first suspension wire 4 is attached to the outer surface of the can body 1.

  On the inner surface of the lower lid 2, hanging pins 2 b (two in the illustrated example) for hooking the second hanging wire 3 are attached. The second suspension wire 3 is hooked on the two suspension pins 2b, and the second suspension wire 3 is passed through the guide pin 1b. It hooks on the main hanging wire hook 5 of the heavy machine shown. On the other hand, first hanging wires 4 are respectively hooked on the two hanging pins 1c on the outer surface of the can body 1, and they are similarly gathered in one place above the charging can 10, and this is provided in a heavy machine not shown. Hang on the hanging wire hook 6.

  By appropriately adjusting the operation of suspending the second suspension wire 3 with the parent suspension wire hook 5 and the operation of suspending the first suspension wire 4 with the child suspension wire hook 6, the lower lid 2 is closed. The can 10 is suspended below the charging hole in the casing, the lower lid 2 is opened below the charging hole, or the lower can 2 is closed, and the groundwater purification material is applied to the charging can 10 above the charging hole. Construction such as throwing in can be implemented. In addition to the form using the main hanging wire hook 5 and the child hanging wire hook 6 provided in one heavy machine, the first and second hanging wire hooks of each heavy machine are used by using two heavy machines. The form which suspends the suspension wires 3 and 4 may be sufficient.

  As an embodiment of the charging can 10, there can be mentioned a form in which the height of the can body 1 is about 2 m, the diameter of the lower lid 2 is about 0.7 m, and the lower lid 2 opens and closes in one direction (Y1 direction).

(Embodiment 2 of the charging can)
FIG. 3 is a perspective view of another embodiment 2 of the charging can as viewed obliquely from below. The charging can 10A shown in the figure is different from the charging can 10 shown in FIGS. 1 and 2 in that the position where the observation well is inserted is the inner end of the can main body 1A, that is, an eccentric position. An eccentric guide tube 1g is provided at an eccentric position inside the main body 1A, and this extends to the lower lid 2A.

  Since the eccentric guide tube 1g is located at the end of the lower lid 2A in this way, the lower lid 2A has a hinge portion 2c at the center, and the divided lids 2Aa and 2Ab on the left and right sides of the hinge portion 2c are opened and closed. (Y2 direction). Such an input can 10A can also be referred to as a “butterfly can”. The other configuration is basically the same as that of the charging can 10.

  The charging can 10 shown in FIGS. 1 and 2 and the charging can 10A shown in FIG. 3 are configured so as not to interfere with the observation well penetrating through the hollow 1a, and the lower lids 2 and 2A do not interfere with the observation well. Furthermore, when the lower lid 2 and 2A are closed with respect to the can body 1 and 1A, the groundwater purification material filled in the hollow 1a of the can body 1 and 1A does not fall downward. It is configured.

  Next, using the input can 10 shown in FIGS. 1 and 2, the groundwater purification material is packed here, and a groundwater purification pile with a built-in observation well is built in the ground, or a groundwater purification pile with a built-in observation well is built. In addition, a method for constructing a groundwater purification wall composed of a plurality of groundwater purification piles along with a groundwater purification pile without an observation well will be described.

(Groundwater purification wall (groundwater purification pile) with built-in observation well)
4 and 5 and FIGS. 7 to 11 are flowcharts of a method for constructing a groundwater purification wall having an observation well in that order. Specifically, FIG. 4 is a diagram illustrating a situation where groundwater purification material is packed in the first embodiment of the charging can, and FIG. 5 is a first method of constructing a groundwater purification wall incorporating an observation well according to the present invention. It is the schematic diagram explaining 1 step and 2nd step, and FIGS. 7-10 is the schematic diagram explaining the 3rd step of the creation method in that order. Further, FIG. 11 is a schematic diagram for explaining a fourth step of the creation method of the present invention, and is a schematic diagram for explaining a groundwater purification wall (groundwater purification pile) having a built-in observation well.

  First, as shown in FIG. 4, the charging can 10 is placed on the ground, and the hopper 7 is placed on the charging can 10.

  The groundwater purification material M to be used is composed of a mixed material in which activated carbon, iron powder, and crushed stones to ensure the flow of groundwater are mixed, and this groundwater purification material M is transported to the site in a packed state. Come. Thus, the plurality of materials constituting the groundwater purification material M to be used are materials having different specific gravities.

  The bag B packed with ton packs of the groundwater purification material M is suspended with a heavy machine (not shown) and dropped into the hopper 7, so that the bag B is broken by a sharp cone at the center, and the groundwater purification material M inside The charging can 10 can be packed.

  At this time, the guide tube lid 1d ′ is attached to the upper opening of the central guide tube 1d so that the groundwater purification material M is not introduced into the central guide tube 1d, so that the groundwater purification material M is the hollow 1a of the can body 1. And the space between the central guide tube 1d.

  Next, as shown in FIG. 5, the casing 20 is installed simultaneously with the installation of the casing 20 by installing the casing 20 while excavating to a predetermined depth with respect to the ground G using an unillustrated full turning excavator or the like. An injection hole 20a is formed in 20 (the first step of the creation method).

  When the casing 20 is installed in the ground G and the injection hole 20a is formed, the observation well 30 is built in the injection hole 20a while being suspended by a heavy machine (not shown) (the second step of the generation method). In the illustrated example, the observation well 30 is built at the center position of the injection hole 20a. However, the observation well 30 may be built at an eccentric position at the end of the injection hole 20a. Depending on the case, suitable charging cans 10 and 10A are applied.

  The observation well 30 is formed of a steel pipe provided with a large number of intake holes 30a, and a tester in which a strainer pipe 40 having, for example, a PVC material formed with intake slits in its entire length is disposed therein and attached to the chain 52. The body 60 and the intake pipe 70 are accommodated in the strainer pipe 40, and the chain 52 is provided with a stopper 51 at the upper end of the chain 52 over the upper end of the observation well 30 to prevent the fall.

  The test body 60 is housed in a housing pipe 61 made of a PVC material and formed with a water intake slit, and is made of the same material as the groundwater purification material M housed in the casing 20.

  In addition, the intake pipe 70 also has an intake slit, and can store and store groundwater therein.

  Although not shown, a flow direction anemometer that measures the flow direction and flow speed of groundwater may be attached to the chain 52.

  By periodically pulling up the chain 52 from the use of the groundwater purification wall and verifying the degree of wear of the test body 60, the actual degree of wear of the groundwater purification wall can be specified, which leads to the specification of the maintenance time.

  Moreover, the purification effect by the groundwater purification wall can be confirmed by pulling up the intake pipe 70 periodically to verify the quality of the groundwater, or by detecting the flow direction of the local groundwater in real time with a flow direction anemometer.

  When the casing 20 is installed in the ground G and the observation well 30 is installed at the center of the charging hole 20a of the casing 20, the groundwater purification material M is charged into the space between the charging hole 20a and the observation well 30. Move on to the step.

  First, as shown in FIG. 7, the charging can 10 filled with the groundwater purification material M is suspended only by the parent suspension wire hook 5 that suspends the second suspension wire 3 connected to the lower lid 2 (parent suspension wire). The hook 5 is subjected to the tension due to the total load P of the charging can 10 and the groundwater purification material M), and the observation well 30 is passed through the central guide tube 1d, and the charging can 10 is placed at a predetermined depth below the charging hole 20a. (X1 direction). Here, the “predetermined depth” means a depth at which no material separation occurs when the groundwater purification material M made of a mixture of a plurality of materials having different specific gravities is dropped. A position about the height of the charging can 10 from the lower end of 20a can be set to a predetermined depth.

  Since the load of the charging can 10 is supported only by the parent hanging wire hook 5 that further suspends the second hanging wire 3 that suspends the lower lid 2 in this way, the charging can 10 is inserted into the predetermined opening 20a. In the process of suspending to the depth, the closed posture of the lower lid 2 is maintained.

  Next, as shown in FIG. 8, the charging can 10 is hung not only by the parent hanging wire hook 5 but also by the child hanging wire hook 6 (for example, the load of the charging can 10 is divided into two by the two wire hooks 5 and 6. ) By releasing the suspended state of the main hanging wire hook 5, the charging can 10 is held in the suspended state by the child hanging wire hook 6 (the tension due to the load P ′ of only the charging can 10 acts). The lower lid 2 opens downward (Y1 direction), and the groundwater purification material M in the charging can 10 can be dropped below the charging hole 20a (X2 direction).

  When the groundwater purification material M is dropped from the charging can 10, next, as shown in FIG. 9, the empty charging can 10 is lifted and positioned near the upper portion of the casing 20, and the suspended state by the first hanging wire 4 is released. Then, the charging can 10 is hung only by the second hanging wire 3, and the lower lid 2 is closed again, and the groundwater purification material M is packed in the charging can 10 (the main hanging wire hook 5 has the charging can 10 and The tension by the total load P of the groundwater purification material M is acting). In addition, when introducing the groundwater purification material M into the empty charging can 10, the hopper 7 shown in FIG. 4 is placed on the charging can 10 in a suspended state, and the groundwater purification material M is input through the hopper 7. Thereafter, the hopper 7 may be detached from the charging can 10 and the charging can 10 may be suspended.

  As described above, by repeating the construction shown in FIGS. 7 to 9, the groundwater purification material M is filled around the observation well 30 and above the injection hole 20a as shown in FIG.

  After the insertion hole 20a provided with the observation well 30 in the center is completely closed with the groundwater purification material M, the groundwater purification pile 100 incorporating the observation well as shown in FIG. To be built.

  Although it may be a groundwater purification wall composed of only one groundwater purification pile 100 shown in FIG. 11, as shown in FIG. 12, observations are made on the left and right of the groundwater purification pile 100 with a built-in observation well in the ground G. By installing the groundwater purification piles 100A that do not contain wells in parallel, the groundwater purification wall 200 that spreads in the ground G can be created.

  According to the method for constructing the illustrated groundwater purification wall 100, 100A, 200, the casing 20 is used to form the introduction hole 20a for the introduction of the groundwater purification material M, and the groundwater purification material M is introduced into the groundwater purification wall M. By creating 100, 100A, and 200, it becomes possible to create the groundwater purification walls 100, 100A, and 200 with high dimensional accuracy.

  In addition, the groundwater purification material M is not dropped from above the injection hole 20a, but is introduced after the groundwater purification material M is carried to the position below the injection hole 20a. Even if it is made of a mixed material, the groundwater purification walls 100, 100A, and 200 having excellent quality are created by the groundwater purification material M in which a plurality of materials are sufficiently mixed without causing material separation. Is possible.

  Furthermore, since the groundwater purification wall 100 has the observation well 30 inside, the performance evaluation of the groundwater purification walls 100, 100A, 200 after the formation of the groundwater purification walls 100, 100A, 200 and the consumption over time. It is possible to verify the degree of wear of the groundwater purification walls 100, 100A, 200 to be performed and to predict the renewal time based on the verification result.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1,1A ... Can main body, 1a ... Hollow, 1b ... Guide pin, 1c ... Hanging pin, 1d ... Center guide tube, 1d '... Guide tube lid, 1e ... Fixing part, 1f ... Opening closing piece, 1g ... Eccentric guide tube 2, 2A ... lower lid, 2Aa, 2Ab ... split lid, 2a ... opening, 2b ... suspension pin, 2c ... hinge part, 3 ... second suspension wire, 4 ... first suspension wire, 5 ... parent suspension wire Hook, 6 ... Child hanging wire hook, 7 ... Hopper, 7a ... Opening part, 10, 10A ... Input can, 20 ... Casing, 20a ... Input hole, 30 ... Observation well, 30a ... Water intake hole, 40 ... Strainer tube, DESCRIPTION OF SYMBOLS 51 ... Fastener, 52 ... Chain, 60 ... Test body, 61 ... Containment pipe, 70 ... Intake pipe, 100 ... Groundwater purification pile (groundwater purification wall) with built-in observation well, 100A ... Groundwater purification pile without built-in observation well (Groundwater purification wall), 200 ... Groundwater purification wall, M Underground water purification material

Claims (4)

A first step of inserting a casing into the ground, hollowing out the casing and forming a charging hole for charging a groundwater purification material;
A second step in which an observation well capable of collecting groundwater is built in the casing;
The can body is composed of a hollow can body and a lower lid that can be freely opened and closed with respect to the can body. The first suspension wire is attached to the can body, and the second suspension wire is attached to the lower lid. Fill the charging can with groundwater purification material, hang the first hanging wire and the second hanging wire on the separate hanging hooks of the heavy machinery, and suspend the charging can with only the second hanging wire. It is suspended in the introduction hole so as not to interfere with the observation well, and after the introduction can is suspended from the first suspension wire, the suspension state of the introduction canister by the second suspension wire is released and the lower lid is removed. Open, drop the groundwater purification material into the charging hole, lift the charging can over the charging hole with the first hanging wire, release the suspended state with the first hanging wire, and pull the charging can with only the second hanging wire. A third step of filling the input can with groundwater purification material in a suspended state,
A method for constructing a groundwater purification wall having a built-in observation well, comprising a fourth step of repeating the third step to fill the inlet hole with groundwater purification material and pulling out the casing to create a groundwater purification wall.   Before installing the observation well, a test body for verifying the level of consumption of the groundwater purification material and / or a groundwater intake pipe and / or a flow direction anemometer for detecting the flow direction and flow velocity of the ground water are installed in the observation well. The method for constructing a groundwater purification wall having an observation well built therein according to claim 1, wherein the observation well is installed in advance or installed in the observation well after being built.   The groundwater purification material according to claim 1 or 2, wherein the groundwater purification material is a mixed material of a plurality of materials having different specific gravities. A charging can that can be moved up and down in the casing so as not to interfere with the observation well in the casing, and in which the groundwater purification material made of a mixture of a plurality of materials having different specific gravities is installed in the casing,
The charging can is provided with a hollow can body that is open at the top, and a lower lid that can be opened and closed with respect to the can body.
The can body is provided with a hanging wire attachment,
The lower lid is provided with a separate hanging wire attachment for opening and closing the lower lid,
An input can having a hollow guide tube through which an observation well penetrates at a central position inside the can main body or an eccentric position at an end.

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