JP2016188569A - Soil sampling method and groundwater guide pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple soil sampling method for sampling a soil under a part of an underground structure pressurized by groundwater while preventing groundwater from uncontrollably spouting into the underground structure at a low cost, and to provide a groundwater guide pipe used for implementing the method.SOLUTION: The soil sampling method includes the steps: drilling a soil sampling hole 100 using a drill 6 in a part fs of an underground structure under which a sampling object soil is positioned and which is pressured by groundwater; allowing spouting groundwater to flow into a receiving container 4 from a groundwater outlet 31 of a groundwater guide pipe 3; discharging the groundwater to a predetermined position using a groundwater discharge unit 5; sampling the soil using a boring machine 7 through the hole 100; and closing the hole using a stop valve 8 or the like.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a soil collection method for collecting soil under a portion of the underground structure that has been pressurized with groundwater (in other words, a portion to which the underground structure has been subjected to groundwater pressure), and to derive the groundwater to be used in the implementation of the method. Regarding the tube.

  For land where structures such as factories, workplaces, underground pits, etc. are constructed, for the purpose of repairing, remodeling or demolishing those structures, and evaluating the value of the land where these structures are constructed, Investigation of soil properties (engineering properties, degree of contamination by harmful substances, etc.) may be required.

For example, according to the current Soil Contamination Countermeasures Law, the government ordinance stipulates that lead, arsenic, trichlorethylene, and other substances that may cause damage to human health due to their inclusion in the soil About thing (specific harmful substance), there is fear of soil contamination at the time of abolition of use of (1) use of harmful substance use specific facility, (2) at the time of report of change of property of land more than fixed scale (3000m ² ) When the prefectural governor approves, or (3) the prefectural governor admits that there is a risk of health damage due to soil contamination, the soil contamination status must be investigated.

With regard to paragraph (2), a person who intends to change the trait of a land of a certain scale (3000 m ² ) or more must notify the prefectural governor, etc. 30 days prior to commencement of construction.

In addition, according to the Soil Contamination Countermeasures Law, if there is a possibility of changing the trait of a land of a certain scale (3000m ² ) or more, or if there is a possibility of changing the trait of the land in the future, the soil pollution Should an investigation be conducted and an application for designation of an area that requires measures such as removal of contamination should be made based on the investigation, etc., or soil contamination is not observed, or although there is soil contamination, health damage will occur There is no fear, and it is possible to clarify where the measures such as removal of contamination are not necessary for the time being, and to evaluate the value of the land.

  Such voluntary soil contamination investigations are conducted when the underground structure is still in use, such as a basement where a boiler is in operation, or in a basement where some material is stored. Even if there is a possibility that the property of the land may change in the future due to sale, etc., if you want to know the asset value in advance, estimate the cost of dismantling the structure on the land, and the structure on the land It can be used when it is desired to know the soil contamination state in advance for estimating a new construction, selecting a construction method when constructing a structure on the land, and the like.

  However, the soil property survey of the land where structures such as factories, workplaces, underground pits, etc. are constructed is conducted by collecting the soil under the floor slab etc. of the underground structure and inspecting and analyzing the collected soil There are things that must be done.

In soil contamination surveys in accordance with the Soil Contamination Countermeasures Law, if there is a history of manufacturing, using, processing, etc. of specific hazardous substances, it is necessary to collect one soil sample every 100 m ² . For this reason, if there are underground structures such as basements or underground pits of a certain size or larger in the survey target area and there is a history of manufacturing, using, processing, etc. of specific hazardous substances, the soil under the underground structures is collected. May need to be done.

  In any case, in order to collect the soil under the underground structure, a hole for collecting the soil must be formed in the floor slab of the underground structure.

  However, when the floor slab or the like of the underground structure is below the groundwater level and is under pressure by the groundwater, when the floor slab or the like is drilled, the groundwater is ejected from the hole into the underground structure.

  If the structure has been decided to be demolished, it may be negligible even if there is such a groundwater eruption, but for example, the basement structure is still in the basement where a working boiler is installed. If the underground structure is in use, such as in a basement where some materials are stored, uncontrolled groundwater ejection into the underground structure may cause the underground structure to be submerged. Or submerge it, so it must be prevented.

  Therefore, the soil under the part of the underground structure that has been pressurized with groundwater (in other words, the part of the underground structure that has been subjected to groundwater pressure), for example, under the floor slab of the underground structure that has been pressurized with groundwater. There is a need for a soil collection method capable of collecting soil while preventing uncontrolled ejection of groundwater into the underground structure. At present, as such a method, a soil collection method described in JP-A-2004-339820 can be exemplified.

FIG. 17 schematically shows an example of this soil collection method.
In the example shown in FIG. 17, the groundwater level WL is slightly lower than the floor slab 10 on the first floor above ground, the floor slab 30 on the second floor underground is covered with groundwater, and the soil under the floor slab 30 is collected. To do.

  When collecting the soil, holes 101 and 102 for installing the pipe 40 in the floor slab 10 on the first floor above ground and the floor slab 20 on the first floor underground are drilled (FIGS. 17A, 17B, 17). (C)). The lower flange of the metal water-impervious annular member 50 is watertightly anchored to the portion of the floor slab 30 of the second basement floor where the soil to be collected is located below (FIG. 17B).

  The pipe 40 is built in the floor slabs 10 and 20 and connected to the water shielding annular member 50 (FIG. 17C). At this time, a portion of the pipe 40 connected to the water shielding annular member 50 is a resin pipe 401, and a metal pipe 402 above it is connected to the pipe 401. The pipe 401 is filled with cement milk and cured.

  On the other hand, a boring machine 60 using a tower 70, a muddy water pump 80, etc. are installed in the floor slab 10 on the first floor above the ground, and a drilling portion of this boring machine 60 is drilled through the pipe 40 into the floor slab 30 on the second basement floor. . The groundwater ejected from the hole rises up to the groundwater level WL in the pipe 40 without flowing out onto the floor slabs 30 and 20 (FIGS. 17D and 17E). In the soil excavation under the pipe 40 and the water shielding annular member 50, the mud pump 80 injects mud water mixed with water and bentonite into the excavation hole for self-sustaining of the excavation hole. Cement milk mixed with cement is injected into the pipe 40 and the excavation hole.

When the soil collection by the boring machine 60 is completed, cement milk 90 is injected into the pipe 40 and the excavation hole (FIG. 17 (f)).
After the injected cement milk is hardened, the resin pipe 401 of the pipe 40 is cut with a cutter, and the upper pipe is pulled up and removed (FIG. 17 (g)).
Then, a water stop lid is fixed to the water shielding annular member 50 to prevent the ejection of groundwater.

  Thus, the soil under the floor slab of the underground structure that is pressurized with groundwater can be collected while preventing uncontrolled ejection of the groundwater into the structure.

JP 2004-339820 A

However, according to the soil sampling method described in Patent Document 1, the following must be noted.
(1) The pipe 40 connected to the water-impervious annular member 50 must be raised above the groundwater level WL, and the drilling portion of the boring machine 60 installed on the floor slab 10 on the ground floor is connected to the pipe. Since it must be passed, a hole through which the pipe passes must also be made in the floor slab above the floor slab 30.
(2) A large boring machine 60 or the like that can pierce the floor slab 30 through the perforated portion of the long pipe 40 must be used, and large machinery such as the boring machine must be installed immediately above the soil sampling position. In order to install them, it is necessary to secure a relatively easy installation place such as a floor slab 10 on the ground floor and to secure a carry-in route for a boring machine or the like to the place. It is necessary to dismantle the existing passages accompanying the carrying of machines and the like and to dismantle the ceiling accompanying the tower installation. In addition, due to the lack of strength of the floor slab, large machines may not be installed on the floor slab. In such a case, soil cannot be collected at that location, and contamination cannot be investigated.
(3) Even if large-scale boring machines can be installed, large boring machines usually use a large internal combustion engine as a power source. For structures, it is also necessary to take measures against exhaust gases (measures against harmful air, odor, smoke, etc.).
(4) Moreover, in the conventional soil sampling method described in Patent Document 1, a cement milk filling / curing step (2 to 3 days) to the long pipe 40 (401, 402) is also required.

As a result, the conventional soil sampling method requires a lot of labor and time for the soil survey as a whole and increases the soil survey cost.
If additional explanation is given about the cost, it takes a lot of labor and time for the soil survey, so the cost is increased, and the dismantling of the existing passage accompanying the carry-in of the boring machine etc. and the dismantling of the ceiling due to the tower installation are necessary If it becomes, the cost of dismantling is necessary, and if it is necessary to take measures against exhaust gas, it also costs it.

  Therefore, the present invention is a soil collection method for collecting the soil under the portion of the underground structure that is covered with the groundwater, while preventing uncontrolled ejection of the underground water into the underground structure. The first object is to provide a soil collection method that is simpler and less expensive than the soil collection method.

  Moreover, this invention makes it a 2nd subject to provide the groundwater outlet pipe which can be used for implementation of the soil sampling method which concerns on this invention.

In order to solve the first problem, the present invention provides:
A soil collection method for collecting soil under a portion of an underground structure that has been pressurized with groundwater (in other words, a portion of the underground structure that has been subjected to groundwater pressure). A groundwater outlet pipe installation process for installing a groundwater outlet pipe having a groundwater discharge port;
A water receiving container installation step for installing the water receiving container so as to receive groundwater flowing out from the groundwater discharge port of the groundwater outlet pipe;
A groundwater discharge device installation step of installing a groundwater discharge device including a water pump for discharging groundwater received in the water receiving container to a predetermined location;
A drilling step for drilling a hole for collecting a soil in the portion pressurized by the groundwater through the inside of the groundwater outlet pipe using a drilling machine for drilling the portion pressurized by the groundwater;
A soil collection step of collecting the soil under the portion covered with the groundwater from the soil collection hole drilled in the drilling step, using a boring machine, through the inside of the groundwater outlet pipe,
After soil collection by the soil collection step, including a water stop treatment for removing the groundwater outlet pipe and a water stop treatment for the soil collection hole by a water stop tool and a groundwater outlet pipe removal step,
As the above groundwater lead-out pipe, water receiving container, groundwater discharge device, drilling machine, boring machine, and water stoppage tool, the sampled soil is manually carried in and out of the portion of the ground that is under pressure with the groundwater. Provide soil collection methods that employ what is possible.

Here, “what can be manually loaded and unloaded with respect to a portion of the groundwater under which the soil to be collected is pressed” means that the portion is manually loaded with respect to the weight, size, shape, etc. These include groundwater outlet pipes that can be carried in and out. For example, it may be partly disassembled and can be carried in and out.
Further, “human power” is a human power that is considered to be possessed by a soil collection worker. However, the groundwater lead-out pipe etc. can be carried in and out of the part of the groundwater under pressure with the groundwater to be collected under the human power considered to be a soil collection worker. However, it may be possible to carry in and out of this part by human power less than such human power or by human power of a person who is not a soil collection worker.

  The above-mentioned “portion where the soil to be collected is covered with the groundwater underneath” is the portion of the floor slab (floor slab portion) that is covered with the groundwater of the underground structure or under the floor slab of the underground structure. For example, concave portions such as pits and grooves that are recessed with ground water are illustrated. The concave portion may or may not have a ceiling wall (for example, a portion of the floor slab above the concave portion).

  In order to solve the second problem, the present invention also provides a groundwater outlet pipe having a groundwater discharge port, which can be used in the implementation of the soil collection method according to the present invention.

  In the groundwater lead-out pipe installation step in the soil collection method according to the present invention, the groundwater lead-out pipe is useful for other members, for example, a groundwater lead-out pipe, or a member that is convenient (for example, a groundwater lead-out pipe described later) You may install in the part covered with the said groundwater in which the extraction | collection object soil is under the interposition of the annular member for installation, or also a relay pipe.

  However, the groundwater lead-out pipe may be installed directly on the portion covered with the groundwater under which the sampling target soil is located without using such a member. Here, “directly installing” does not mean excluding the case of installing via a sealing agent for water stop, a seal member for water stop, and the like.

  In the soil collection method according to the present invention, although not necessarily limited, it is preferable that the water receiving container installation step is performed at a timing before groundwater begins to flow out from the groundwater discharge port of the groundwater outlet pipe. The groundwater discharge device installation step is preferably performed at a timing at which water received in the water receiving container is not leaked from the water receiving container. Even if the groundwater flows out onto the floor slab etc., it can be dealt with by wiping work etc., and there is a case where there is no need to consider it as a problem, but the timing of the water receiving container installation process and the groundwater discharge device installation process is this Such timing is preferable.

  According to the soil collection method according to the present invention, the groundwater discharge port portion of the groundwater outlet pipe for the groundwater ejected by drilling in the portion of the underground structure where the collection target soil is below and is covered with the groundwater. It can be discharged from a water receiving container to a predetermined place (for example, a place where there is no hindrance to the use of an underground structure) by a groundwater discharge device.

  According to the soil collection method according to the present invention, when collecting soil, it is not necessary to form a hole for installing a pipe for passing a conventional large boring machine into the floor slab of the upper floor from the portion where the collection target soil is below In addition, there is no need for large-scale dismantling of existing passages associated with carrying in large boring machines, or ceiling dismantling associated with tower installation. Moreover, even if a large machine cannot be installed on the floor slab because the slab of the upper floor is insufficient in the first place, it is possible to collect the soil under the portion of the underground structure that is covered with groundwater.

  According to the soil collection method according to the present invention, each of the groundwater outlet pipe, the water receiving container, the groundwater discharge device, the floor slab drilling machine, the boring machine, and the water stopping tool used for soil collection can be carried in and out manually. Compared to a conventional large boring machine or a tower for the same, it is easy to handle and relatively inexpensive.

  According to the soil sampling method of the present invention, a large boring machine using a large internal combustion engine is not adopted as a power source, and therefore it is not necessary to take measures against exhaust gas even in structures such as factories and workplaces in use. .

  According to the soil collection method according to the present invention, after collecting the soil, the soil collection hole opened in the portion where the collection target soil is located can be closed with a water-stopping tool. 2-3 days) do not need.

  By these, according to the soil sampling method according to the present invention, in collecting the soil under the portion of the underground structure that has been pressurized with the groundwater, while preventing the uncontrolled ejection of the groundwater into the underground structure, Compared with the conventional soil collection method, the soil can be collected easily and inexpensively.

  The soil sampling method according to the present invention can be easily implemented as compared with the conventional soil sampling method while preventing uncontrolled ejection of groundwater into the underground structure. Even if the underground structure to be included is still in use such as a basement in which an operating boiler is installed or in use such as a basement in which some materials are stored, it can be adopted. Therefore, the underground structure including the portion where the collection target soil is located may be an underground structure in use.

  As described above, in the groundwater lead-out pipe installation step in the soil sampling method according to the present invention, the groundwater lead-out pipe is placed on the portion covered with the groundwater under the ground to be collected through another member. You may install in the part covered with the said groundwater in which the said collection | recovery object soil is direct, without passing through such a member.

More on this point:
In the case where the portion of the soil to be collected which is under pressure with the groundwater is a floor slab portion under pressure with the groundwater of the underground structure, in the groundwater outlet pipe installation step, for example, the groundwater outlet pipe is The soil to be collected is installed on the floor slab part below the annular member for installing the outlet pipe, and the drilling step and the soil collecting step pass inside the ground water outlet pipe and the annular member for installing the groundwater outlet pipe. And the case where a material that can be manually carried in and out of the floor slab portion can be used as the annular member for installing the groundwater outlet pipe.

  Thus, when the groundwater outlet pipe is installed in the floor slab portion where the sampling target soil is below through the groundwater outlet pipe installation annular member, the groundwater outlet pipe installation annular member is connected to the groundwater outlet pipe in advance. In this state, the groundwater outlet pipe may be installed in the floor slab part by installing the groundwater outlet pipe installation annular member in the floor slab part. Or, for example, in order to make it easier to install the groundwater outlet pipe on the floor slab portion, the annular member for groundwater outlet pipe installation is first installed on the floor slab portion, and the annular member for installing the groundwater outlet pipe is installed. The groundwater outlet pipe may be installed in the floor slab portion by connecting the groundwater outlet pipe.

  Further, in the case where the portion covered with the groundwater under which the collection target soil is pressed is a concave portion under the floor slab of the underground structure, in the groundwater outlet pipe installation step, for example, the groundwater outlet pipe Is installed at the bottom of the recessed portion via an annular member for groundwater outlet pipe installation and a middle pipe, and the drilling step and the soil collecting step are performed by the annular member for installing the groundwater outlet pipe, the middle pipe and the groundwater outlet pipe. The case where it implements through the inside and employ | adopts what can carry in and carry out with respect to the said concave-shaped part manually as each of the annular member for groundwater outlet pipe installation and a relay pipe can be mentioned.

  As described above, when the groundwater outlet pipe is installed via the annular member for connecting the groundwater outlet pipe and the intermediate pipe, the portion covered with the groundwater under which the soil to be collected is the recessed portion described above The groundwater outlet pipe, the water receiving container, the drilling machine, the boring machine and the like are positioned higher than the recessed portion (for example, the floor slab portion higher than the recessed portion, or the recessed shape The case where it is provided on the ceiling wall in the case where the portion has a ceiling wall can be exemplified.

In this example, when the concave portion has a ceiling wall, a hole through which the relay pipe is passed may be formed in the ceiling wall using, for example, the drilling machine.
Installation of the annular member for installing the groundwater outlet pipe in the recessed portion where the collection target soil is below, connection between the annular member for installing the groundwater outlet pipe and the intermediate pipe, the intermediate pipe and the groundwater outlet pipe The order of interconnection may be any order as long as the work is not hindered.

In any case, the annular member for installing the groundwater outlet pipe and the intermediate pipe are also those that can be manually carried in and out of the portion covered with the groundwater under which the soil to be collected is under pressure. However, even here, “the material that can be manually loaded and unloaded with respect to the portion of the ground soil to be sampled that is under pressure” is the weight, size, shape, etc. On the other hand, it is an annular member or intermediate pipe for groundwater outlet pipe installation that can be carried in and out manually. For example, it may be partly disassembled and can be carried in and out.
Further, “human power” is a human power that is considered to be possessed by a soil collection worker. However, it may be possible to carry in and out of the portion by human power less than such human power or by human power of a person who is not a soil collection worker.

When the groundwater lead-out pipe is installed in a portion covered with the groundwater under the soil to be collected via an annular member for groundwater lead-out pipe installation (the groundwater lead-out pipe is connected to the annular member for groundwater lead-out pipe and the relay) As an example, including the case where the soil to be collected is installed in a portion covered with the groundwater below through a pipe)
As the water stop tool used in the water stop treatment and groundwater outlet pipe removal step, at least one stop cock arranged in the soil collection hole and a lid that closes the opening of the annular member for installing the ground water outlet pipe are adopted. And
In the water stop treatment and groundwater outlet pipe removal step, the soil water collecting pipe passes through the inside of the groundwater outlet pipe and the annular member for installing the groundwater outlet pipe (if the intermediate pipe is used, the intermediate pipe is also passed). At least one stop cock is disposed in the hole, and then the groundwater outlet pipe is detached from the groundwater outlet pipe installation annular member (if a middle pipe is used, the intermediate pipe is also the groundwater outlet pipe installation annular member) After that, if there is still a stopcock to be placed in the soil collection hole, the stopcock is also placed in the soil collection hole, and then the opening of the annular member for installing the groundwater outlet pipe is opened. A case where the soil collection hole is covered with the lid body from above the water stopcock by closing with the lid body can be exemplified.

Further, when the groundwater lead-out pipe is installed in a portion where the sampling target soil is covered with the groundwater under the groundwater lead-out pipe installation annular member (the groundwater lead-out pipe is an annular member for groundwater lead-out pipe installation) And other cases (including the case where the soil to be collected is installed in a portion covered with the groundwater below) via a relay pipe)
As the water stop tool used in the water stop treatment and groundwater outlet pipe removal step, at least one water stop cock disposed in the soil collection hole, and above the water stop valve disposed in the soil collection hole, Adopting a lid that covers and closes the hole for soil collection,
In the water stop treatment and groundwater outlet pipe removal step, the soil water collecting pipe passes through the inside of the groundwater outlet pipe and the annular member for installing the groundwater outlet pipe (if the intermediate pipe is used, the intermediate pipe is also passed). At least one stop cock is placed in the hole, and then the groundwater outlet pipe and the annular member for installing the groundwater outlet pipe are removed from the portion covered with the groundwater under the soil to be collected (the intermediate pipe is removed). If it is adopted, the intermediate pipe is also removed), and if there is still a stop cock to be placed in the soil collection hole, the stop cock is also placed in the soil collection hole and then the stop cock A case where the hole for collecting soil is covered with the lid body from above is mentioned.

  When carrying out this water stop treatment and groundwater outlet pipe removal step, pass through the inside of the groundwater outlet pipe and the annular member for groundwater outlet pipe installation (if the intermediate pipe is adopted, also pass through the intermediate pipe) At least one stop cock is disposed in the soil collection hole, and then the groundwater outlet pipe and the annular member for installing the groundwater outlet pipe (if the intermediate pipe is used, the intermediate pipe) is the soil to be collected. When removing from the portion of the groundwater that is under pressure, the groundwater outlet pipe (or the groundwater outlet pipe and the intermediate pipe) is first removed from the annular member for installing the groundwater outlet pipe, and then the soil collection is still performed. If there is at least one stop cock to be placed in the drain hole, at least one of the stop cocks is placed in the soil collection hole, and then the ground water outlet pipe installation annular member is attached to the ground water If there is a water stop cock to be placed in the soil collection hole after removing from the pressurized portion, the water stop cock is also placed in the soil collection hole, and then the water stop cock is placed over the water stop cock. The soil collection hole may be covered with the lid.

When the groundwater outlet pipe is directly installed in a portion (for example, the floor slab portion where the sampling target soil is below) that is covered with the groundwater where the sampling target soil is below,
As the water stop tool used in the water stop treatment and the groundwater outlet pipe removal step, at least one water stop cock arranged in the soil sampling hole and from above the water stop plug fitted in the soil sampling hole Adopting a lid that covers and closes the hole for soil collection,
In the water stop treatment and groundwater outlet pipe removal step, at least one stop cock is disposed in the soil collection hole through the inside of the groundwater outlet pipe, and then the groundwater outlet pipe is covered with the groundwater. If there is still a stopcock to be placed in the soil collection hole, the stopcock is also placed in the soil collection hole, and then the soil collection top is placed on the stopcock. A case where the hole is covered and closed with the lid can be mentioned.

  Even when the groundwater outlet pipe is installed directly on a portion of the ground to be collected, which is covered with the groundwater, or when the groundwater outlet pipe is installed via a member such as the annular member for groundwater outlet pipe installation. As mentioned above, as a water stop tool to be used in the water stop treatment and groundwater outlet pipe removal step, as described above, at least one water stop cock arranged in the soil sampling hole of the floor slab portion drilled in the drilling step And a case of adopting a lid that covers the hole from above the water stop cock fitted in the hole, the following water stop cock is exemplified as such at least one water stop cock. it can.

(A) Water stopcock (for example, rubber plug) that can close the opening (inlet opening) of the soil sampling hole in the floor slab part
(B) One or more water stopcocks that can be positioned deeper than the opening (inlet opening) of the soil collection hole and close the hole.
For example,
(B1) A water faucet in which a disc-shaped elastic plug is sandwiched from both sides with a clamping member, and a nut (for example, a wing nut) is screwed into a bolt penetrating the elastic plug. A water stop cock that is arranged in the above-described manner and causes the peripheral portion of the elastic plug to expand in the radial direction of the elastic plug by bringing the clamping members close to each other with the bolts and nuts, and to contact the inner peripheral surface of the soil sampling hole.
(B2) A water stop cock in which a swellable rubber that swells with moisture is provided around a core made of synthetic resin, metal, etc., and is placed in a hole for collecting soil to swell the swellable rubber with moisture A water stop cock that contacts the inner circumference of the soil collection hole.
(B3) For example, after installing a stop cock such as the above (b1) and / or (b2) in the hole for soil collection, it is put into the upper side of the stop cock and solidified to be fitted into the hole. Water-stopper made of water-cement cement that is worn.

  In the water stop treatment, one or more of the water stop cocks are employed. When only one stop cock is used, it is recommended to use a stop cock that closes the opening (inlet opening) of the soil collection hole, which is easy to handle.

The groundwater outlet pipe used for the soil sampling method for solving the first problem of the present invention and the groundwater outlet pipe for solving the second problem of the present invention have a groundwater discharge port.
As an example, it has an upper end opening and a lower end opening that extend in the vertical direction, and has a groundwater discharge port that is oriented laterally or generally laterally with respect to the vertical direction in the middle part between the openings. Can be mentioned.

  In any case, examples of the groundwater outlet pipe used for the soil collection method according to the present invention and the groundwater outlet pipe that solves the second problem of the present invention include, for example, those provided with an open / close valve at the groundwater discharge port. Can do.

  In any case, the groundwater outlet pipe used for the soil sampling method according to the present invention and the groundwater outlet pipe that solves the second problem of the present invention may be provided by adding a pipe connecting portion to the upper end opening. .

  According to the present invention, there is provided a soil collection method for collecting soil under a portion of an underground structure that is covered with groundwater, while preventing uncontrolled ejection of groundwater into the underground structure. Compared with the collection method, a simple and inexpensive soil collection method can be provided.

  Moreover, according to this invention, the groundwater outlet pipe which can be used for implementation of the soil sampling method which concerns on this invention can be provided.

It is a figure which shows the example (basement) of the underground structure in use including the floor slab part which the extraction | collection object soil is under. It is a figure which shows the example of the annular member for groundwater outlet pipe installation, A figure (A) is a front view, A figure (B) is a top view, A figure (C) is a bottom view. It is a perspective view of the annular packing example for water stop. It is a figure which shows the example of a groundwater outlet pipe, A figure (A) is a side view, A figure (B) is a front view, A figure (C) is a top view, A figure (D) is a bottom view. It is a figure which shows the punching machine example. FIG. 6A is a diagram showing an example of a boring machine, and FIG. 6B is a diagram showing another example of the boring machine. It is a figure which shows the example of a water stop cock. It is a figure which shows the example of a water stop cover, A figure (A) is a side view, A figure (B) is a top view. An anchor for fixing the annular member for installing the groundwater outlet pipe is planted in the part of the floor slab of the basement that is covered with groundwater, where the soil to be collected is below, and water is stopped on the upper surface of the floor slab part. It is a figure which shows the process of apply | coating a sealing agent. It is a figure which shows the process of fixing the annular member for groundwater lead-out pipe installation to the floor slab part in which collection object soil is under, and figure (A) shows annular packing on the anchor and sealant for water stop shown in FIG. It is a figure which shows the process of arrange | positioning and apply | coating the sealing agent for water stop on this annular packing, FIG. (B) is an annular member for groundwater outlet pipe installation on the said annular packing with the sealing agent for water stop in between. It is a figure which shows the process of arrange | positioning and nut-fastening to an anchor. It is a figure which shows the state which connected and installed the groundwater outlet pipe to the annular member for groundwater outlet pipe installation fixed to the floor slab. It is a figure which shows a mode that a groundwater outlet pipe is connected standingly to the annular member for groundwater outlet pipe installation fixed to the floor slab, a water receiving container and a groundwater discharge device are installed, and a floor slab is perforated by a perforator. It is sectional drawing which shows a mode that the hole for soil collection of the floor slab part after soil collection is closed with a water stopcock, and the annular member for groundwater outlet pipe installation is closed with a cover body from the top of a water stopcock. It is a figure which shows the other example of a water stop process, FIG. 14 (A) has shown the example which arrange | positions a plurality of water stop cocks in the hole for soil collection, and FIG. Shows an example of covering the soil collection hole with a lid. It is a figure which shows the other example of groundwater outlet pipe installation to a floor slab part. It is a figure which shows the other example of the soil sampling method which concerns on this invention. It is a figure which shows the prior art example of the soil sampling method.

  Hereinafter, some examples of the soil sampling method according to the present invention and examples of groundwater outlet pipes used for carrying out these example methods will be described with reference to the drawings.

[First soil collection method]
The first soil sampling method is a method of sampling the soil S under the floor slab FS (see FIG. 1 and the like) of the basement UR (see FIG. 1) in the bottom layer of the structure, which is an example of the underground structure. The floor slab FS is located below the groundwater level WL and is pressurized with groundwater (groundwater pressure is applied). The basement UR in the illustrated example is in use, has an operating boiler B, and stores material G.

  In collecting the soil under the floor slab FS, the following (1) to (9), bolts and nuts, a sealing agent for water stop, etc. are prepared in advance. In these cases, the soil collection worker can carry in and take out the portion fs of the floor slab FS under which the collection target soil S is located by human power.

(1) Annular member 1 for groundwater outlet pipe installation (see Fig. 2 etc.)
(2) Annular packing 21, 22 (see FIG. 3 etc.)
(3) Groundwater outlet pipe 3 (see FIGS. 4, 11, and 12)
(4) Water receiving container 4 (see FIG. 12)
(5) Groundwater discharge device 5 (see FIG. 12)
(6) Drilling machine 6 for drilling floor slabs (see FIGS. 5 and 12)
(7) Boring machine 7 for soil collection (see Fig. 6)
(8) Water stopcock 8 (see FIGS. 7 and 13) to be filled in the hole for soil collection after soil collection of the floor slab
(9) Lid 9 (see FIGS. 8 and 13)

Hereinafter, each of (1) to (9) will be described.
In addition, since the annular member 1 for groundwater outlet pipe installation functions as a kind of water stop tool together with the lid body 9 in the water stop process for the soil collection hole formed in the floor slab FS, as will be described later. In the following description, the “annular member for installing a groundwater outlet pipe” may be referred to as “an annular member for water stop”. In addition, the “lid” may be referred to as a “waterstop lid”.

(1) Water stop ring member 1 (see FIG. 2 etc.)
As shown in FIG. 2 and the like, the annular member 1 for water stop is a short cylindrical member having a low height, and has a lower end flange 11 around the lower end opening and an upper end flange 12 around the upper end opening. Each of the upper and lower end flanges is formed with a plurality of bolt through holes 111 and 121 at equal central angular intervals. Although not limited thereto, in this example, the bolt through holes of the upper and lower end flanges 11 and 12 are the same number.

  The water stop ring member 1 may be made of metal, but may be made of synthetic resin so that it can be provided at a lower cost. In this example, it is made of hard vinyl chloride resin. The upper and lower flanges 11 and 12 may be fixed to the main body 1a of the annular member 1 with an adhesive or the like. However, since the adhesive may contain harmful substances, in this example, the main body 1a is provided with a vinyl chloride resin. Welded with.

  Generally speaking, the inner diameter of the water stop ring member 1 is slightly larger than the outer diameter of the bit so as not to hinder the insertion and rotation of the drilling machine for floor slab drilling used. You just have to. In this example, the inner diameter r1 = about 20 cm.

  In the first soil sampling method, the water stop ring member 1 is left on the floor slab FS of the basement UR after the soil is collected as described later, so that the height is not disturbed by various operations in the basement UR. h1 is preferably about 10 cm to 20 cm. In this example, h1 is about 20 cm in consideration of the size of the stop cock 8 (see FIG. 7), which will be described later.

(2) Annular packing 21 (see Fig. 3 etc.)
The annular packing 21 is a non-water-permeable packing having elasticity that can be adjusted even if there is unevenness on the upper surface of the perforation target portion fs of the floor slab FS. In this example, it is a non-water-permeable rubber packing having a circular ring shape and has an elasticity enough to adapt to such unevenness, and has a thickness of about 0.3 cm. The annular packing 21 has a plurality of bolt through holes 211. The bolt through hole 211 is a hole corresponding to the bolt through hole 111 of the lower end flange 11 of the water stop annular member 1.

(3) Groundwater outlet pipe 3 (see Fig. 4 etc.)
As shown in FIG. 4 and the like, the groundwater outlet pipe 3 is a cylindrical member having a height H1, and is provided in the middle part of the cylindrical main body 3a in the form of a pipe projecting in a horizontal direction substantially perpendicular to the height direction. An outlet 31 is provided, and a flange 32 is provided around the lower end opening, and a flange 33 is provided around the upper end opening. An open / close valve 34 that can be manually operated with a handle 341 is attached to the groundwater discharge port 31.

  A plurality of bolt through holes 321 are formed in the flange 32. The bolt through hole 321 is a hole corresponding to the bolt through hole 121 of the upper end flange 12 of the water stop annular member 1. A plurality of bolt through holes 331 are also formed in the flange 33.

  The groundwater lead-out pipe 3 may be made of metal, but may be made of synthetic resin so that it can be made cheaper and lighter. In this example, it is made of hard vinyl chloride resin. The flanges 32 and 33 may be fixed to the cylindrical main body 3a of the outlet pipe 3 with an adhesive or the like. However, since the adhesive may contain harmful substances, in this example, vinyl chloride resin is used for the main body 3a. Used for welding.

  Generally speaking, the inner diameter of the groundwater outlet pipe 3 should be slightly larger than the outer diameter of the bit so that it does not hinder the drilling bit of the drilling machine for drilling the floor slab to be used. . In this example, it has the same inner diameter as the annular member 1 for water stop.

The height H1 of the groundwater lead-out pipe 3 is such that the groundwater ejected into the basement UR by the perforation of the floor slab FS flows not only from the groundwater discharge port 31 but also from the upper end opening 35 of the lead-out pipe 3. The height should not be lost. The height H1 at which the groundwater does not flow out from the upper end opening 35 is determined in advance from the height from the floor slab FS to the groundwater level, the diameter of the hole drilled in the floor slab FS, or the inner diameter of the groundwater discharge port 31 in advance. You can decide.
In some cases, the amount of groundwater discharged can be suppressed by raising the position of the groundwater discharge port 31.

  The height of the groundwater lead-out pipe 3 is such that the groundwater lead-out pipe 3 can be diverted (reused) even if the groundwater level and the diameter of the hole drilled in the floor slab may vary slightly due to different soil collection locations. H1 is, for example, approximately 30 cm or more, but can be, for example, approximately 100 cm or less in consideration of ease of handling. In this example, the height H1 is 47.5 cm.

(4) Annular packing 22 (see Fig. 3 etc.)
As will be described later, when the ground packing pipe 3 is detachably connected to the water sealing ring member 1 and the annular packing 22 is erected, the upper flange 12 and the bottom flange 32 of the ground water discharging pipe 3 are provided. In this case, it is the same packing as the packing 21.

(5) Water receiving container 4 (see FIG. 12) and groundwater discharge device 5 (see FIG. 12)
The water receiving container 4 is a container that receives the groundwater W flowing out from the groundwater discharge port 31 of the groundwater outlet pipe 3. The water receiving container 4 may be made of metal, but may be made of synthetic resin so that it can be provided at a lower cost and lighter. In this example, it is made of hard vinyl chloride resin.
The groundwater discharge device 5 is a device including a submersible pump (water pump) 51 and a flexible hose 52 connected to the submersible pump 51. The groundwater accumulated in the container 4 is pumped from the container by the pump 51 without overflowing, and is flexible. For example, it is a device that discharges to a groundwater discharge place (not shown) on the ground, for example, which is predetermined by the sex hose 52.

(6) Drilling machine 6 for drilling floor slabs (see Fig. 5 etc.)
In the drilling machine 6, workers (average physique, physical strength soil collecting workers) can carry in and install into the floor slab part fs to be drilled in the basement UR with only their human power, and after drilling the target floor slab part fs, From there, a simple and easy-to-handle drilling machine that can be carried out only by the human power is adopted. The punching machine 6 may be disassembled for carrying-in and carrying-out and can be assembled for installation.

  As a drilling machine, but not limited to, for example, a concrete structure and road described in “Core Drill Construction Method Summary” issued in July 2007 by Diamond Works Business Cooperative (formerly National Concrete Cutter Work Cooperative) It is possible to use a drilling machine that can pierce etc., is small and can be carried only by human power, and is easy to handle.

  Here, such a type of drilling machine 6 illustrated in FIG. 5 is employed. The perforating machine 6 can stand a support column 61 on the floor slab FS, support the main body 62 on the support column 61 so that the main body 62 can be moved up and down, and move the main body 62 up and down by manual operation of the handle 63.

  The main body 62 includes a motor 621 and a bit holding portion 622 that can be rotationally driven by the motor. The drill bit 64 held by the bit holding portion 622 is rotationally driven by the motor 621 and the floor slab portion fs is operated by operating the handle 63. Can be perforated in the portion fs. Here, the drill bit 64 is provided with a blade portion 642 provided with a diamond tip at the tip (lower end) of a cylindrical metal tube 641.

  In this example, the overall height H2 of the drilling machine 6 is approximately 180 cm, the outer diameter r2 of the drilling bit 64 is approximately 13 cm, and the height of the bit 64 can be increased by, for example, extending a tube, The slab FS can be perforated even if the thickness is large. The diameter r of the floor slab hole 100 (see FIGS. 6, 7, and 13) formed by the bit 64 is about 13 cm.

(7) Boring machine 7 for soil collection (see Fig. 6)
As for the boring machine 7, workers (average physique and physical strength soil collecting workers) can be carried into the floor slab part fs to be drilled in the basement UR with only human power, and after collecting the desired soil, only the human power can be taken from there. Adopt a small and easy-to-handle boring machine that can be carried out. The boring machine 7 may be disassembled for carrying in and out, and may be assembled for installation.

  Although not limited as a boring machine, for example, a hitting boring machine such as Geotech Co., Ltd. that can perform boring called SCSC (registered trademark) boring at a boring site can be used.

FIG. 6A shows one example.
The boring machine 7 shown in FIG. 6A supports a soil sampler 74 connected to the electric hammer 71 via a rod 73 by supporting a handle 72 provided on the electric hammer 71 by one or a plurality of people, and the depth to be investigated. Then, by extracting the sampler 74, the soil (stratum sample) at the depth to be investigated can be collected. The boring machine 7 here has a total height H3 including the sampler 74 of about 250 cm.

  In place of the hammer 71, a hydraulic hammer 7 'illustrated in FIG. 6B may be employed. Further, if no countermeasure is required for engine exhaust gas, or if a simple countermeasure can be used, an internal combustion engine type engine hammer can be employed instead of the hammer 71.

(8) Stop cock 8 to be filled in the floor slab hole after soil collection (see FIGS. 7 and 13)
The stop cock 8 is a stopper packed in the floor slab hole 100 after soil collection. Although it is not limited to this, in this example, it is the rubber stopper of the shape which inverted the skull cone. In this example, the rubber plug 8 has an upper end diameter r3 of about 13.5 cm, a lower end diameter r4 of about 12 cm, and a height H4 = about 15 cm with respect to the floor slab hole 100 formed by the punching machine 6.

  An engaging member 82 having a pin engaging groove 821 is provided on the upper surface of the rubber plug 8. This is an engaging member capable of engaging / disengaging a pin 811 provided in a radial direction inside the tip of a rod 81 that holds and operates the stopper when the rubber stopper 8 is packed in the floor slab hole 100. .

(9) Water stop lid 9 (see FIGS. 8 and 13)
After the target soil collection is completed, the water stop lid 9 is passed through the water stop ring member 1 from above the rubber plug 8 fitted in the floor slab hole 100 to the rubber plug 8 toward the hole 100. It is fixed to the water stop annular member 1 while applying a pushing force. The water blocking lid 9 has a cylindrical stopper member 91 that protrudes downward from the lower surface thereof.

The water stop lid 9 may be made of metal, but may be made of synthetic resin so that it can be provided at a lower cost and lighter. In this example, it is made of hard vinyl chloride resin.
The water stop lid 9 has a bolt through hole 92 that can correspond to the bolt through hole 121 of the upper end flange 12 so that the upper end flange 12 of the water stop annular member 1 can be bolted and nut-fastened.
In this example, the water stop lid 9 can also be bolted and nut-fastened to the upper end flange 33 of the groundwater outlet pipe 3.

  Among those described above, each of the annular member 1 for water stop, the annular packings 21 and 22, the groundwater outlet pipe 3, the water receiving container 4, the groundwater discharge device 5, the stopcock 8, and the waterproof lid 9 is also a worker ( An average physique and physical strength soil collecting worker) can carry in and out the floor slab portion fs to be drilled in the basement UR with only human power.

Next, the soil collection method will be described.
First, as shown in FIG. 9, in order to fix the annular member 1 for water stop to the portion fs of the floor slab FS of the lowermost basement UR covered with groundwater, where the soil to be collected is below, as shown in FIG. 9. The anchor 13 is provided, and a sealing agent 14 for water stop is applied to the upper surface of the floor slab portion fs.

  The anchor 13 is of a male screw type capable of screwing a nut, but may be of a female screw type capable of screwing a bolt.

  The sealing agent 14 for water stop is not limited as long as it can perform a water stop (watertight) treatment, but is preferably a water-swelling sealant that expands by containing water, for example, a sealant (Ultra Seal P manufactured by ADEKA). -201) can be employed.

  Next, as shown in FIG. 10, the annular packing 21 is arranged on the applied sealing agent 14, and the bolt through hole 211 is aligned with the anchor 13, and the sealing agent 14 is also applied to the upper surface of the annular packing 21. To do.

  Next, the sealing agent 14 of the annular packing 21 is applied to the lower end flange 11 of the water stop annular member 1 with the bolt passage hole 111 aligned with the bolt passage hole 211 (see FIG. 3) of the annular packing 21 and the anchor 13. Overlaid on the upper surface. The nut N is screwed and fastened to the anchor 13 passed through the bolt through-hole 211 and the bolt through-hole 111, thereby fixing the water-stopping annular member 1 to the floor slab portion fs under which the soil to be collected is watertight.

  Furthermore, the lower end flange 32 (see FIGS. 11 and 12) of the groundwater outlet pipe 3 is disposed on the upper end flange 12 of the water stop annular member 1 via the annular packing 22. At that time, the bolt passage hole 321 of the flange 32 is aligned with the bolt passage hole of the annular packing 22 and the bolt passage hole 121 of the upper end flange 12 of the water stop annular member 1, and both flanges 12 and 32 are both bolts and nuts BN. It is fixedly connected so that the flange can be separated (see FIG. 11). Thus, the groundwater outlet pipe 3 is provided upright on the water stop annular member 1.

  If there is no problem, the lower end flange 32 of the groundwater outlet pipe 3 is connected to the upper end flange 12 of the water stop annular member 1 via the annular packing 22 in advance, and then the lower end flange 11 of the water stop annular member 1 is attached. You may fix and install in the floor slab part fs through the sealing agent 14 for water stop and the annular packing 21. FIG.

  Further, as shown in FIG. 12, a water receiving container is provided so as to receive groundwater W discharged from the groundwater discharge port 31 of the groundwater outlet pipe 3 (in this example, more accurately speaking, the on-off valve 34) as will be described later. 4 is arranged. A groundwater discharge device 5 is installed for the water receiving container 4. In this example, the pump 51 of the device 5 is arranged in the container 4 and the hose 52 connected to the pump 51 is connected to a predetermined groundwater discharge place on the ground or the like.

A drilling machine 6 is installed in the floor slab FS with respect to the groundwater outlet pipe 3. At this time, if the drill bit 64 is held in the bit holding part 622 of the drilling machine 6 due to the low space height above the floor slab FS, the drill bit 64 is led out from the upper end opening 35 of the groundwater outlet pipe 3. 3 and when it is difficult to insert into the water stop annular member 1, for example, the piercing bit 64 removed from the bit holding portion 622 is inserted into the outlet pipe 3 and the water stop annular member 1, and then the piercing bit is inserted. 64 may be held in the bit holding unit 622 or the like. In this way, the drilling machine 6 is installed in the floor slab FS, and the drilling bit 64 inserted into the outlet pipe 3 and the water stop ring member 1 is driven from the upper end opening 35 of the groundwater outlet pipe 3 to the floor slab portion fs. A hole 100 for soil collection (see FIGS. 6 and 13) is opened.
When the drilling machine 6 is removed from the groundwater outlet pipe 3 after the hole 100 for soil collection is formed, the drilling machine 6 may be disassembled and removed.

  The groundwater W spouted by opening the hole 100 is received by the water receiving container 4 by opening or opening the manual opening / closing valve 34 of the groundwater discharge port 31 of the groundwater outlet pipe 3 to discharge the groundwater. The device 5 is discharged to a place where there is no problem.

  Next, soil (soil sample) at the investigation depth under the hole 100 is collected using the boring machine 7 instead of the drilling machine 6. During this time, the groundwater discharged to the water receiving container 4 is discharged by the discharge device 5.

  Also for the boring machine 7, the soil sampler 74 is connected to the electric hammer 71 of the boring machine 7 via the rod 73, due to the lower space height of the floor slab FS, etc. When the rod 73 and the soil sampler 74 are removed from the electric hammer 71 or the soil sampler 74 is inserted into the rod 73, for example, when it is difficult to insert the rod 73 and the soil stop annular member 1 through the upper end opening 35 of the rod. In a state where they are removed from the pipe, they are inserted into the outlet pipe 3 and the water stop ring member 1 and then attached to the electric hammer 71. Moreover, when removing the boring machine 7 from the groundwater outlet pipe 3 after collecting the soil, the boring machine 7 may be disassembled and removed.

  After sampling the target soil, the boring machine 7 is removed, and the stop cock 8 held by the rod 81 is lowered from the upper end opening 35 of the groundwater outlet pipe 3 to the floor slab hole 100 as shown in FIG. And the rod 81 is removed from the stop cock 8. Thereafter, the bolts and nuts BN are released, and the groundwater outlet pipe 3 is removed from the water stop annular member 1.

  Next, as shown in FIG. 13, the water stop lid 9 is engaged with the engagement member 82 of the water stop cock 8 (the pin 811 at the tip of the rod 81 is disengaged) in a cylindrical plug presser portion 91 protruding downward from the lower surface thereof. The engaging member that can be separated) is accommodated and the stopper plug 91 is fixed to the upper end flange 12 of the water stopping annular member 1 with bolts and nuts while pressing the water stopper 8 toward the hole 100.

The engaging member 82 may be removed from the water stop cock 8 before the water stop ring member 1 is closed by the water stop lid 9. In that case, the stopper pressing portion 91 does not need to have a hollow portion that can accommodate the engaging member 82.
In addition, if the water stopcock 8 can be stopped without being pressed by a stopper pressing portion 91, the water stopper 8 may not be pressed by a stopper pressing portion 91.

  Thus, when the soil collection is completed, the unnecessary devices and the like are manually removed from the basement UR.

  According to the soil sampling method described above, the valve 34 of the groundwater outlet pipe 3 is opened with the groundwater W spouted by drilling in the part fs of the floor slab FS of the basement UR where the sampling target soil is below. The water can be discharged from the groundwater discharge port 31 to the water receiving container 4 and discharged to a predetermined place (for example, a place where the use of the basement UR is not hindered) by the groundwater discharge device 5.

  When collecting soil, it is not necessary to form a hole to build a pipe for passing a conventional large boring machine into the floor slab on the floor above the floor slab FS where the soil to be collected is located, and large boring machines, etc. There is no need for dismantling of large existing passages associated with the loading of the ceiling, or dismantling of the ceiling associated with the tower installation. In addition, the soil under the floor slab FS can be collected even when a large machine cannot be installed on the floor slab due to insufficient strength of the floor slab on the upper floor.

  Each of the water stop ring member 1 used for soil collection, the ground water outlet pipe 3, the water receiving container 4, the ground water discharge device 5, the floor slab drilling machine 6, the boring machine 7, the water stop cock 8, the water stop lid 9, etc. It can be carried in and out by human power, and is easier to handle and relatively cheaper than conventional large boring machines and their towers.

  Since a large boring machine using a large internal combustion engine as a power source is not adopted, it is not necessary to take a large measure against exhaust gas even in underground structures such as factories and workshops in use.

  After collecting the soil, the hole 100 opened in the floor slab FS can be easily closed with the water stopcock 8, and the water stopcock 8 can be easily fixed with the waterstop lid 9, and the cement milk filling and hardening process (2 ~ 3 days) not required.

  By these, according to the above-mentioned soil collection method, when collecting the soil under the floor slab FS of the basement UR covered with groundwater, it is easy and inexpensive while preventing uncontrolled ejection of the groundwater into the basement. The target soil can be collected.

  In the soil sampling method described above as an example, the groundwater outlet pipe 3 having the upper end flange 33 and the valve 34 is adopted. However, the upper end flange 33 and the valve 34 are used for carrying out the soil sampling method according to the present invention. Is not necessary. However, when the soil sampling is temporarily interrupted, the on-off valve 34 of the groundwater outlet pipe 3 is closed for safety (to prevent unexpected and uncontrollable outflow of the groundwater into the underground room UR). The upper end opening 35 of the groundwater outlet pipe 3 can be closed by fixing the lid body 9 ′ (see FIG. 11) from which the water stop lid 9 or the stopper holding portion 91 is omitted to the upper end flange 33.

  Further, the upper end flange 33 of the groundwater lead-out pipe 3 is connected to the groundwater lead-out pipe 3 in the case where the groundwater lead-out pipe 3 is diverted for soil collection in a basement or the like having a blow-through structure. It can be used when soil is collected using a boring machine using a high tower. In this case, the groundwater rises to the external groundwater level in the pipe that has been added, and there is a possibility that the pipe that has added the weight of the groundwater cannot be removed manually, but the groundwater level is lowered by opening the valve 34, It can also be removed by human power.

  Moreover, in the soil sampling method illustrated and explained above, the flanges 12 and 32 are used for the standing connection of the groundwater outlet pipe 3 to the waterstop annular member 1, but the waterstop annular member 1 and the groundwater outlet pipe 3 are connected to each other. Other connection structures may be used as long as they can be connected in a separable manner. For example, even if it has a structure using a tubular joint that is fitted over both the tubular main body of the water stop annular member 1 and the tubular main body of the groundwater outlet pipe 3 and is separably fixed thereto. Good.

  In addition, in addition to the case where the soil collection is temporarily interrupted, if the suspension is only interrupted for a short period, for example, the boring machine 7 is once removed and passed through the groundwater outlet pipe 3 and the water stop ring member 1 for soil collection. When the hole 100 is closed with the stop cock 8, the open / close valve 34 of the groundwater outlet pipe 3 is closed and the upper end opening 35 of the groundwater outlet pipe 3 is closed with the water stop lid 9 or lid body 9 ′, and soil collection is resumed. The water stop lid 9 or the lid body 9 ′ is removed from the groundwater outlet pipe 3, the water stop cock 8 is also removed, the boring machine 7 is re-installed, and the soil collection is resumed.

  If it is interrupted for a long time, for example, as shown in FIG. 13, when the stopper 8 is arranged in the soil collection hole 100, the water stop ring member 1 is closed with a lid, and soil collection is resumed, Remove the lid from the water stop ring member 1, connect the ground water outlet pipe 3 to the water stop ring member 1, remove the plug 8 from the hole 100, and re-install the boring machine 7 to resume soil collection. do it.

[Second soil collection method]
In the first soil collection method described above, the water stop treatment after soil collection for the hole 100 for soil collection formed in the floor slab portion fs is filled with the stop cock 8 in the hole 100 and the water stop ring is closed. The member 1 was left in the part fs of the floor slab FS, and the water stop lid 9 was attached to the upper end flange 12 of the water stop ring member 1 to close the upper end opening of the water stop ring member 1.

In this way, if the water-stopping annular member 1 is left in the portion that is covered with the groundwater under which the sampled soil is collected (the floor slab portion fs in the first soil collection method), the sample is collected. For example, a liquid containing specific hazardous substances specified in the Soil Contamination Countermeasures Act exists in the part of the target soil covered with groundwater, and the water-stopping annular member 1 is removed in the water-stopping treatment. For example, when there is a possibility that the liquid may flow into the soil collection hole 100, the inflow of such liquid can be suppressed by the water stop annular member 1.
Assuming that there is a liquid containing specific hazardous substances stipulated in the Soil Contamination Countermeasures Act in the part of the ground covered with the groundwater to be collected, for example, the part is discarded from the plating tank containing the plating solution in the plating factory. Example of the bottom of the pit that receives the plating solution once, and the waste plating solution contains specific harmful substances such as hexavalent chromium and cyan, and the waste plating solution remains at the bottom of the pit. it can.

However, if the water-stopping annular member 1 is left on the floor slab FS as in the first soil sampling method, for example, in the case of a basement in use like the basement UR in the illustrated example, The annular member 1 may get in the way.
Therefore, in the second soil sampling method, the water stopping process for removing the ground water outlet pipe 3 and the water stopping process for the soil sampling hole 100 after the soil sampling and the ground water outlet pipe removing process are performed as follows. The steps before the water stop treatment and the groundwater outlet pipe removal step are substantially the same as those in the first soil sampling method.

  In the water stopping treatment and the groundwater outlet pipe removal step in the second soil sampling method, after the target soil is collected and the boring machine 7 is removed, the groundwater outlet pipe 3 and the water stop ring member 1 are passed through. As shown in FIG. 14, a stop cock 801 is disposed in the hole 100 of the floor slab portion fs.

  In this example, the stop cock 801 is a stop cock in which a swellable rubber 8012 that swells with moisture is provided around a synthetic resin core material 8011, and the swellable rubber 8012 is not yet swollen. It is arranged at the deepest position in 100. Although the arrangement of the stop cock 801 is not shown in FIG. 14, for example, as shown in FIG. 7, a rod 81 having an engagement pin at the tip and a core member 8011 of the stop cock 801 are provided later. What is necessary is just to arrange | position using the pin engaging member 82 which can be removed from this core material. As the stop cock 801, the thing using the brand name nice seal (water-proof packer material) provided by Applied Measurement Service Co., Ltd. can be adopted, for example.

  Prior to disposing the stop cock 801, depending on the situation, a backfilling material (for example, at least one of bentonite pellets, soil, crushed stone, etc.) 800 is filled in the holes of the soil S following the holes 100. May be.

  When the swellable rubber 8012 swells and is fitted in a watertight or substantially watertight contact with the inner peripheral surface of the hole 100, the order is not limited thereto. For example, the groundwater outlet pipe 3 and the water stop ring member 1 is removed from the floor slab portion fs, and a stop cock 802, a stop cement 803, and a stop cock 804 are sequentially disposed above the stop cock 801.

  Further, for example, at least after the stop cock 801 is disposed, first, the groundwater outlet pipe 3 is removed from the water stop ring member 1, and at least one of the remaining stop cocks is disposed in the hole 100, and then the water stop is performed. The annular member 1 may be removed from the floor slab portion fs, and then, if there is still a stopcock to be placed in the hole, it may be also placed in the hole 100.

  The water faucet 802 is also called a water shut-off device. A disc-shaped elastic plug 8021 is sandwiched between a pair of clamping members 8022 from both sides, and a wing nut 8023 is screwed into a bolt 8023 passed through them. The stopper plug is disposed in the hole 100, and the peripheral portion of the elastic plug 8021 is radially expanded by bringing the clamping member 8022 closer to each other with the bolts and nuts. It is a stop cock that comes into contact with the surface. As this type of water stop cock, for example, an IN type (inside type) water stop mechanical plug provided by Kantool Co., Ltd. can be adopted.

  For the water stopper 804, for example, a rubber stopper made of the same material as the water stopper rubber plug 8 employed in the first soil sampling method can be used. Here, the rubber plug 804 is pushed into the hole 100 until the upper surface thereof is positioned at substantially the same height as the upper surface of the floor slab portion fs.

  After the stopcocks 801 to 804 are arranged in the holes 100 in this way, the holes 100 are formed from above the stopcocks with a lid body 9 '(in this example, the stopper holding portion 91 is omitted from the stopcock lid 9). Stuff). At this time, the sealant 14 for water stop is applied around the upper end opening of the hole 100, or the annular packing 21 and the sealant 14 for further water stop are further disposed, and the lid body 9 is disposed thereon, and the first The lid 9 'is fixed to the floor slab portion fs and the hole 100 is closed in the same manner as when the water stop ring member 1 is installed in the floor slab portion fs by the soil collection method.

  In the above description, four kinds of stop cocks 801 to 804 are adopted as the stop cocks, but it is not necessary to adopt all of the stop cocks. If the water can be stably and reliably stopped, only one water stop cock may be adopted. If only one water stop cock is employed, a water stop cock 804 disposed at the entrance opening of the hole 100 can be exemplified.

  Moreover, you may employ | adopt 1 or 2 or more and the backfilling material 800 among the water stopcocks 801-803 in the water stop process in a 1st soil extraction method.

[Third soil collection method]
According to the third soil sampling method, for example, when it is desired to install the groundwater outlet pipe 3 in the floor slab portion fs short because the upper space height of the floor slab portion fs below the sampling target soil is low. Can be adopted. In this soil sampling method, as shown in FIG. 15, the groundwater outlet pipe 3 is directly installed on the floor slab portion fs. The ground water outlet pipe installation annular member 1 employed in the first and second soil sampling methods is not employed.

  In the third soil sampling method, the structure of the floor slab FS of the lowermost basement UR covered with groundwater is applied to the portion fs below the sampling target soil as in the case of the first soil sampling method. Similarly, as shown in FIG. 9, the anchor 13 is provided, and the sealing agent 14 for water stop is applied to the upper surface of the floor slab portion fs.

  Next, as shown in FIG. 10A, the annular packing 21 is arranged on the applied sealant 14, and the bolt through hole 211 is aligned with the anchor 13, and the upper surface of the annular packing 21 is also sealed. Agent 14 is applied.

  Next, the lower surface flange 32 of the groundwater outlet pipe 3 is arranged so that the bolt passage hole 321 is aligned with the bolt passage hole 211 (see FIG. 3) of the annular packing 21 and the anchor 13, and the upper surface to which the sealing agent 14 of the annular packing 21 is applied. Overlaid on. The nut N is screwed and fastened to the anchor 13 passed through the bolt through hole 211 and the bolt through hole 321, so that the groundwater outlet pipe 3 is directly and watertightly installed in the floor slab portion fs.

  In the water stopping treatment and the groundwater outlet pipe removal step, the target soil is sampled and the boring machine 7 is removed, and then the second method passes through the inside of the groundwater outlet pipe 3 into the hole 100 of the floor slab portion fs. As in the case, a stop cock 801 is arranged as shown in FIG.

  Prior to disposing the stop cock 801, a backfill material 800 for filling the soil hole in the hole of the soil S following the hole 100 may be introduced depending on the situation.

  Also in this example, when the swellable rubber 8012 swells and is fitted in a watertight or substantially watertight contact with the inner peripheral surface of the hole 100, the order is not limited thereto. It removes from the slab part fs, and the water stop cock 802, the water stop cement 803, and the water stop cock 804 are arrange | positioned one by one above the stop cock 801. FIG.

  After the stop cocks 801 to 804 are arranged in the holes 100 in this way, the holes 100 are covered with a lid 9 'from above the stop cocks as shown in FIG. 14B.

  Even in the third soil collection method, not all of the four types of stop cocks 801 to 804 have to be adopted. If the water can be stably and reliably stopped, only one water stop cock may be adopted. If only one water stop cock is employed, a water stop cock 804 disposed at the entrance opening of the hole 100 can be exemplified.

[Fourth soil collection method]
The fourth soil sampling method is an example of a soil sampling method in which the soil to be collected is below and the portion covered with groundwater is a concave portion under the floor slab. As shown in FIG. 16, the recessed portion is a pit P that is recessed with respect to the floor slab FS. There is a soil S to be collected under the pit bottom p1. In this example, the pit P is covered with the ceiling wall p2. In this example, a part of the floor slab FS also serves as the ceiling wall p2. The ceiling wall p2 has an opening (not shown), and a soil collection worker can carry the water-stop ring member 1 and the like into and out of the pit P from this opening.

  The height from the bottom part p1 of the pit P to the ceiling wall p2 is such that an operator can move while bending his / her waist. Therefore, as shown in FIG. 16, the groundwater outlet pipe 3, the water receiving container 4, the groundwater discharge The device 5, the drilling machine 6 (not shown), the boring machine 7, etc. are installed on the ceiling wall p2.

The collection of the soil under the pit bottom p1 is substantially the same as in the case of the first soil collection method or the second soil collection method except for the following points.
In the fourth soil sampling method, the water stop ring member 1 installed at the bottom p <b> 1 of the pit P and the groundwater outlet pipe 3 are connected via the intermediate pipe 30. The intermediate pipe 30 can also be carried into and out of the pit P by a soil collection worker.

In the illustrated example, a hole p2h through which the intermediate pipe 30 is passed through the pit ceiling wall p2 is opened using the drilling machine 6, but a bit having a larger diameter than the bit 64 is opened. If the intermediate pipe 30 can be passed through the opening through which the person can go in and out, this may be done.
If the order of installation of the water stop ring member 1 to the pit bottom p1, connection of the water stop ring member 1 and the intermediate pipe 30, and connection of the intermediate pipe 30 and the groundwater outlet pipe 3 is not an obstacle to the work. Any order is acceptable.

  The water stop treatment after soil collection and the groundwater outlet pipe removal step are substantially the same as those in the first soil collection method or the second soil collection method except that the intermediate pipe 30 is removed. is there.

  INDUSTRIAL APPLICABILITY The present invention can be used to easily collect soil for the purpose of investigating the contamination state of the soil under the portion of the underground structure covered with groundwater.

UR Basement FS which is an example of an underground structure slab part s of floor slab where the soil to be sampled is below the floor slab fs of the basement UR Soil P Pit p1 Pit bottom p2 Pit ceiling wall 100 Soil sampling hole 1 Ground member 21, 22 Annular packing 3 Groundwater outlet pipe 31 Groundwater discharge port 34 On-off valve 30 Relay pipe 4 Water receiving container 5 Groundwater discharge device 51 Submersible pump 52 Hose 6 Drilling machine 7 Boring machines 8, 801, 802, 803, 804 Plug 800 Backfill material 9 Water stop lid 9 'Lid

Claims (10)

A soil collection method for collecting soil under a portion of an underground structure covered with groundwater, wherein a groundwater outlet pipe having a groundwater discharge port is installed in the portion covered with groundwater. Installation process;
A water receiving container installation step for installing the water receiving container so as to receive groundwater flowing out from the groundwater discharge port of the groundwater outlet pipe;
A groundwater discharge device installation step of installing a groundwater discharge device including a water pump for discharging groundwater received in the water receiving container to a predetermined location;
A drilling step for drilling a hole for collecting a soil in the portion pressurized by the groundwater through the inside of the groundwater outlet pipe using a drilling machine for drilling the portion pressurized by the groundwater;
A soil collection step of collecting the soil under the portion covered with the groundwater from the soil collection hole drilled in the drilling step, using a boring machine, through the inside of the groundwater outlet pipe,
After soil collection by the soil collection step, including a water stop treatment for removing the groundwater outlet pipe and a water stop treatment for the soil collection hole by a water stop tool and a groundwater outlet pipe removal step,
As the above groundwater lead-out pipe, water receiving container, groundwater discharge device, drilling machine, boring machine, and water stoppage tool, the sampled soil is manually carried in and out of the portion of the ground that is under pressure with the groundwater. A soil collection method characterized by adopting a possible one.   The portion of the soil to be sampled that is under pressure with the groundwater is a floor slab portion that is under pressure with the groundwater of the underground structure. In the groundwater outlet pipe installation step, the groundwater outlet pipe is installed in the groundwater outlet pipe. It is installed in the floor slab part where the soil to be collected is located through the annular member, and the drilling step and the soil collecting step are performed through the ground water outlet pipe and the ground water outlet pipe installation annular member, The soil sampling method according to claim 1, wherein the annular member for installing the groundwater outlet pipe is one that can be manually carried in and out of the floor slab portion.   The portion covered with the groundwater under which the soil to be sampled is a concave portion under the floor slab of the underground structure, and in the groundwater outlet pipe installation step, the groundwater outlet pipe is formed into the concave shape. It is installed at the bottom of the part via an annular member for connecting the groundwater outlet pipe and the intermediate pipe, and the drilling step and the soil collecting step are performed through the inside of the annular member for installing the groundwater outlet pipe, the intermediate pipe and the groundwater outlet pipe. The soil collecting method according to claim 1, wherein each of the annular member for connecting the groundwater outlet pipe and the intermediate pipe is one that can be manually carried in and out of the recessed portion. As the water stop tool used in the water stop treatment and groundwater outlet pipe removal step, at least one stop cock arranged in the soil collection hole and a lid that closes the opening of the annular member for installing the ground water outlet pipe are adopted. And
In the water stop treatment and groundwater outlet pipe removal step, the groundwater outlet pipe and the groundwater outlet pipe are arranged inside the annular member for installing the groundwater outlet pipe and at least one stop cock in the soil collection hole, and then the groundwater Remove the outlet pipe from the annular member for groundwater outlet pipe installation, and if there is still a stopcock to be placed in the soil collection hole, the groundwater is also placed in the soil collection hole, and then the groundwater The soil collection method according to claim 2 or 3, wherein the opening for the annular member for installing the outlet pipe is closed with the lid body so that the soil collection hole is covered with the lid body from above the water stop cock. As the water stop tool used in the water stop treatment and groundwater outlet pipe removal step, at least one water stop cock disposed in the soil collection hole and the soil from above the water stop valve disposed in the soil collection hole Adopting a lid that covers and closes the sampling hole,
In the water stop treatment and groundwater outlet pipe removal step, the groundwater outlet pipe and the groundwater outlet pipe are arranged inside the annular member for installing the groundwater outlet pipe and at least one stop cock in the soil collection hole, and then the groundwater Remove the outlet pipe and the annular member for groundwater outlet pipe installation from the portion of the soil to be sampled that is under pressure by the groundwater, and if there is still a stopcock to be placed in the soil sampling hole, The soil collection method according to claim 2 or 3, wherein after the stop cock is also disposed in the soil collection hole, the soil collection hole is covered with the lid body from above the stop cock. In the groundwater lead-out pipe installation step, the groundwater lead-out pipe is installed directly on the portion covered with the groundwater where the soil to be collected is under,
As the water stop tool used in the water stop treatment and groundwater outlet pipe removal step, at least one water stop cock disposed in the soil collection hole, and above the water stop valve disposed in the soil collection hole, Adopting a lid that covers and closes the hole for soil collection,
In the water stop treatment and groundwater outlet pipe removal step, at least one stop cock is disposed in the soil sampling hole through the inside of the groundwater outlet pipe, and then the groundwater outlet pipe is placed below the soil to be collected. If there is a stop cock to be placed in the soil collection hole after removing from the portion covered with the groundwater, the stop cock is also placed in the soil collection hole and then the stop cock The soil collecting method according to claim 1, wherein the hole for soil collection is covered with the lid body from above.   The soil collection method according to any one of claims 1 to 6, wherein the underground structure including a portion covered with the groundwater under which the collection target soil is subjected is an underground structure in use.   The soil sampling method according to any one of claims 1 to 7, wherein a groundwater outlet pipe provided with an open / close valve at the groundwater discharge port is adopted as the groundwater outlet pipe.   The soil sampling method according to any one of claims 1 to 8, wherein a groundwater lead-out pipe having a pipe connecting portion added to an upper end opening is adopted as the groundwater lead-out pipe. A groundwater outlet pipe having a groundwater discharge port, which is used to implement the soil sampling method according to any one of claims 1 to 9.