JP6300532B2 - Perforated pipe material and method for driving the same - Google Patents

Description

  The present invention relates to a perforated pipe material and a method for driving the same, and more specifically, even in a loose saturated sand ground requiring liquefaction countermeasures, it is possible to effectively prevent soil and sand from entering through a slit, The present invention relates to a perforated pipe material that can easily and effectively prevent clogging of a slit and a method for driving the perforated pipe material.

  Conventionally, there has been known a method of burying a perforated pipe material provided with an opening such as a slit in a target ground in order to collect groundwater or collect soil contaminants (for example, Patent Documents 1 and 2).

  Patent Document 1 (Japanese Patent No. 342289) discloses a rectangular slit to prevent silt or clay from entering the inside of the screen tube and clogging the water sampling part (opening part) when driven into the ground. A well tube having a triple structure of an outer tube provided with an inner tube, an inner tube provided with a circular hole, and a net portion interposed between the outer tube and the inner tube is disclosed.

  Further, Patent Document 2 (Japanese Patent Laid-Open No. 2008-274578) prevents clogging during driving by closing the slit with a material that can be melted in the ground before driving the perforated pipe material into the ground. A method is disclosed.

  Further, in Patent Document 3 (Japanese Patent Laid-Open No. 2012-193534), a plurality of slits having a width of 0.2 mm to 0.6 mm are set so that the total opening area of the slits is not more than three times the inner cross-sectional area of the tubular body. The perforated pipe material thus formed is disclosed.

Japanese Patent No. 342289 JP 2008-274578 A JP 2012-193534 A

  However, Patent Document 1 does not mention any measures for preventing clogging at the time of placing a perforated pipe material, and Patent Documents 1 and 2 describe the slits generated after the perforated pipe material is driven into the ground. No solution is disclosed for clogging.

  In particular, the perforated pipe material having a triple structure disclosed in Patent Document 1 can reach the hole of the outer pipe outside the inner pipe even if a cleaning brush is inserted when the slit of the outer pipe is clogged. Since the brush tip does not reach, you cannot remove silt and clay clogged with the brush.

  Further, in Patent Document 1, even when high-pressure cleaning water is sent to the inner tube for cleaning, the cleaning water flows to the outer tube side through the hole in the inner tube, so that it is possible to wash off silt and clay clogged in the slit. However, there is a risk that effective well cleaning cannot be performed.

  Furthermore, the perforated pipe material disclosed in Patent Document 3 (Japanese Patent Laid-Open No. 2012-193534) can avoid clogging that inhibits air injection as long as a predetermined condition is satisfied. When used in loose saturated sand ground that requires a lot of liquefaction measures, a large amount of earth and sand must flow into the pipe through the slit and be washed.

  That is, when a perforated tube material 11 having a slit portion 12 formed with a plurality of slits 12a as shown in FIG. As shown in FIG. 1 (b) and FIG. 1 (c), the earth and sand 4 penetrates into the perforated tube material 11 as shown by the arrow A from the plurality of slits 12a, and as shown in FIG. 1 (d). In addition, since the sediment 14 is deposited in the perforated tube material 11 and as a result, the slit 12a is closed, a hollow pipe 13 is separately inserted into the perforated tube material 11 and pressurized water is supplied into the pipe 12. And the plurality of slits 12a were washed with water to eliminate clogging of the plurality of slits 12a. In particular, in the case of a loose saturated sand ground, before driving the perforated tube material 11 to a predetermined depth, the earth and sand 14 penetrates into the perforated tube material 11 from the plurality of slits 12a, and the slit 12a is closed, A more serious situation occurred.

  Further, in order to prevent earth and sand from entering the perforated tube material 11 from the plurality of slits 12a, after the perforated tube material 11 is driven to a predetermined depth, the cap of the perforated tube material 11 is used using a cap or the like. There is also known a method of removing clogging of the plurality of slits 12a blocked by the earth and sand 14 by connecting the air injection pipe and sending pressurized air into the perforated tube material 11. In the method, after the pressurized air is sent into the perforated tube material 11, when the cap that has blocked the head of the perforated tube material 11 is removed, the pressure of the air in the perforated tube material 11 decreases, and a plurality of slits Since the earth and sand 14 penetrates into the perforated pipe material 11 from 12 and the earth and sand 14 accumulates in the perforated pipe material 11 and as a result, the slit 12a is closed, a hollow pipe is separately provided in the same manner as described above. 13 is inserted into the perforated tube 11 And, by supplying pressurized water to the pipe 13, wash several slits 12a, it is necessary to eliminate the clogging of the plurality of slits 12a.

  Therefore, the present invention can effectively prevent soil and sand from entering through the slit even in a loose saturated sand ground that needs countermeasures against liquefaction, and easily and effectively prevent clogging of the slit. An object of the present invention is to provide a perforated pipe material that can be used.

  Another object of the present invention is to effectively prevent soil from entering through the slit even in loose saturated sand ground that requires countermeasures against liquefaction. An object of the present invention is to provide a method for driving a perforated pipe material that can be prevented.

This object of the present invention is to
It has a slit part where a plurality of slits are formed and a sediment deposit part where sediment can be deposited,
A hollow closing member that is slidable with the inner surface of the slit portion and is arranged to close all the plurality of slits;
A perforated pipe member comprising: a pipe member capable of injecting pressurized water or pressurized air into the sediment deposit part below the hollow closing member through the hollow portion of the hollow closing member Achieved with tubing.
The hollow blocking member can be moved upward by the pressure of water or air injected into the sediment accumulation part through the pipe member, and can be moved downward by pushing down the pipe member.

Another object of the present invention is to
It has a slit part in which a plurality of slits are formed, and penetrates a perforated pipe material in which a hollow closing member is arranged at a position for closing the plurality of slits of the slit part into the ground,
A pipe member is used to inject pressurized water or pressurized air through the hollow portion of the hollow closing member into the sediment deposit portion below the hollow closing member, thereby Push up,
Opening the plurality of slits, causing water or pressurized air pressurized from the plurality of slits to flow into the ground,
With the pressurized water or pressurized air injected into the sediment deposit part below the hollow blocking member, the hollow blocking member is pushed up to open the plurality of slits,
After the injected pressurized water or pressurized air flows out from the plurality of slits into the ground through the pipe member,
By supplying pressurized air into the pipe member, while allowing the pressurized air to flow into the ground from the plurality of slits,
The hollow closing member is returned to a position where the plurality of slits of the slit portion are closed, and the slit is closed.

  According to the present invention, a perforated pipe material in which a blocking member is disposed at a position where a plurality of slits of the slit portion is closed is penetrated into the ground, and pressurized water or pressurized air is blocked through the pipe member. A plurality of slits are injected by injecting into the sediment deposit part below the member, pushing up the closing member, opening the plurality of slits, and allowing the pressurized water or pressurized air to flow out into the ground from the plurality of slits Can be effectively prevented from being clogged, and the clogging member is pushed up by the pressurized water or pressurized air injected into the sediment deposit portion below the clogging member, so that the slits are formed. After the pressurized water or pressurized air that has been released and flows out of the slit into the ground via the pipe member, the compressed air is injected into the pipe member by injecting the pressurized air into the ground. While flowing out into the ground, the closing member can be returned to the position where the plurality of slits of the slit portion are closed, and the slit can be closed. This can be effectively prevented.

  In a preferred embodiment of the present invention, the pipe member is fixed in the hollow portion of the hollow closing member.

  In another embodiment of the present invention, the hollow closing member includes a coupling member on an upper surface thereof, the pipe member is connected to the coupling member, and is connected to the hollow portion of the hollow closing member. Yes.

  According to the present invention, even in a loose saturated sand ground that requires countermeasures against liquefaction, it is possible to effectively prevent the intrusion of earth and sand from the slit, and easily and effectively prevent clogging of the slit. It becomes possible to provide a perforated tube material that can be used.

  In addition, according to the present invention, even in a loose saturated sand ground requiring liquefaction countermeasures, it is possible to effectively prevent soil and sand from entering through the slit, and clogging of the slit can be easily and effectively performed. It is possible to provide a method for driving a perforated pipe material that can be prevented.

FIG. 1 is a schematic longitudinal sectional view showing a step of driving a conventional perforated tube material. FIG. 2 is a schematic perspective view of a perforated tube material according to a preferred embodiment of the present invention. FIG. 3 is a schematic perspective view of a closing member that can be inserted into a perforated tube material according to a preferred embodiment of the present invention. FIG. 4 is a schematic longitudinal cross-sectional view showing a step of injecting a predetermined amount of air into the ground by driving a perforated pipe material according to a preferred embodiment of the present invention into the ground. FIG. 5 is a schematic vertical cross-sectional view showing a process of injecting a predetermined amount of air into the ground by driving a perforated pipe material according to another preferred embodiment of the present invention into the ground. FIG. 6 is a schematic vertical cross-sectional view showing a process of injecting a predetermined amount of air into the ground by driving a perforated tube material according to another preferred embodiment of the present invention into the ground. FIG. 7 is a schematic longitudinal sectional view showing details of a connecting portion between the coupling member and the pipe.

  FIG. 2 is a schematic perspective view of a perforated tube material according to a preferred embodiment of the present invention.

  As shown in FIG. 2, the perforated tube material 1 according to a preferred embodiment of the present invention includes a slit portion 2 in which a plurality of slits 2 a for sending air are formed, and a perforated tube material 1 that is more than the slit portion 2. It is formed at a lower position near the tip, and is provided with a sediment depositing section 3 that deposits the sedimented sand and prevents the plurality of slits 2a from being blocked when the soil enters the perforated tube material 1.

  The perforated tube material 1 can be inserted with a closing member 4 that closes the slit portion 2 and prevents intrusion of earth and sand from the plurality of slits 2a. As shown in FIG. 3, the closing member 4 is hollow. Thus, the pipe 5 is inserted and fixed inside the closing member 4.

  The material of the closing member 4 is not particularly limited. For example, a material in which a seal member such as an O-ring (not shown) is attached to the surface that contacts the pipe 5 with metal, rubber, cork, urethane, or the like. Is used.

  A marker (not shown in FIGS. 2 and 3) is attached to the surface of the pipe 3.

  When a predetermined amount of air is injected into the ground using the perforated pipe material 1 configured as described above, the perforated pipe material 1 is driven into the ground as follows.

  FIG. 4 is a schematic longitudinal sectional view showing a step of injecting a predetermined amount of air into the ground by driving the perforated tube material 1 according to a preferred embodiment of the present invention into the ground.

  In FIG. 4, reference numeral 6 indicates a marker attached to the surface of the pipe 5.

  First, as shown in FIG. 4A, the perforated tube material 1 is penetrated to a predetermined position in the ground in a state where the closing member 4 closes the plurality of slits 2 a of the slit portion 2.

  Thereafter, water twice or three times the sum of the inner volume of the slit portion 2 and the inner volume of the sediment depositing portion 3 is fed into the pipe 5 as shown in FIG. It is injected into the lower sediment deposit part 3. In this state, the height position of the marker 6 of the pipe 5 coincides with the height position of the opening end portion of the perforated tube material 1.

  Next, as shown in FIG. 4 (c), pressurized air is injected into the pipe 5, and the water pressure in the sediment accumulation section 3 is increased. As a result, the closing member 4 is pushed up above the slit portion 2 by water pressure, a part of the plurality of slits 2a of the slit portion 2 is opened, and water flows out into the ground through the plurality of slits 2a. In this state, the marker 6 of the pipe 5 gradually moves away from the open end of the perforated tube material 1 and moves upward.

  Here, since the closing member 4 is pushed up by the water pressure, the water pressure in the slit portion 2 and the water pressure in the sediment accumulation portion 3 are also high, and therefore, it is possible to effectively prevent intrusion of earth and sand from the plurality of slits 2a. In the unlikely event that earth or sand enters from a plurality of slits 2a, it effectively prevents the water filled in the slit portion 2 from washing out the earth and sand and causing clogging of the slit 2a. can do.

  Next, as shown in FIG. 4D, the closing member 4 is pushed upward so that the plurality of slits 2a are completely opened, and water flows out into the ground through the plurality of slits 2a. Become. As a result, the air pressure in the pipe 3 does not increase, and the position of the marker 6 of the pipe 5 is held at a certain height position in the vertical direction.

  When the plurality of slits 2a are completely opened and all the water in the perforated tube 1 flows into the ground, as shown in FIG. 4 (e), air flows into the ground from the plurality of slits 2a. It becomes like this.

  Further, the pipe 5 is pushed down until the height position of the marker 6 attached to the pipe 5 coincides with the height position of the opening end portion of the perforated tube material 1, the closing member 4 is lowered, and a plurality of slits 2 a The air in the perforated tube material 1 is injected into the ground via

  Thus, as shown in FIG. 4 (f), when the pipe 5 is pushed down and the marker 6 is lowered so that its height position matches the height position of the open end of the perforated tube material 1, the blocking member 4. Returns to the initial position in the slit portion 2, and the many slits 2 a of the slit portion 2 are closed by the closing member 4.

  According to this embodiment, after the perforated tube material 1 penetrates to a predetermined position in the ground with the closing member 4 closing the plurality of slits 2 a of the slit portion 2, the internal volume of the slit portion 2 and the earth and sand Two to three times as much water as the sum of the internal volume of the accumulation part 3 is injected into the sediment accumulation part 3 below the closing member 4, and then pressurized air is injected into the sediment accumulation part 3. The closing member 4 is pushed up above the slit portion 2 by water pressure, and a part of the slits 2a is opened, but since pressurized water flows out from the opened slits 2a into the ground, The earth and sand can be effectively prevented from flowing into the perforated pipe material 1 from the opened slit 2a. When water flows out from the perforated pipe material 1 into the ground, the air corresponding to the volume is slit. Since it is injected into the space in the part 2 and the sediment deposit part 3, Even if the material 4 rises and all the slits 2a of the slit portion 2 are opened, pressurized air is injected into the ground from the slit 2a, and the pipe 5 is pushed into the perforated tube material 1 while maintaining this state. Thus, since all the slits 2a of the slit portion 2 are closed by the closing member 4, it becomes possible to effectively prevent the earth and sand from flowing into the perforated tube material 1 from the slit 2a.

  Further, according to the present embodiment, the water pressure is applied to the lower surface of the closing member 4 so that the closing member 4 is pushed up and the slit 2a is opened. As compared with the case of cleaning the inside of the perforated tube material 1, it is possible to efficiently clean the inside of the perforated tube material 1 and eliminate clogging in the slit 2a without taking time and effort.

  Moreover, according to this embodiment, since the pressurized water is supplied to the slit part 2 and the sediment depositing part 3, not only can the entry of sediment from the opened slit 2 be prevented, but at the same time, the perforated The slit portion 2 and the sediment deposit portion 3 of the tube material 1 can be washed, and clogging of the slit 2a that has been clogged can be eliminated.

  FIG. 5 is a schematic longitudinal sectional view showing a step of driving a perforated tube material 1 according to another preferred embodiment of the present invention into the ground and injecting a predetermined amount of air into the ground.

  First, as shown in FIG. 5A, the perforated tube material 1 is penetrated to a predetermined position in the ground in a state where the closing member 4 closes the plurality of slits 2 a of the slit portion 2.

  Next, as shown in FIG. 5B, the pressurized air is injected into the pipe 5, and the pressurized air is injected into the sediment accumulation portion 3 located below the closing member 4. In this state, the height position of the marker 6 of the pipe 5 coincides with the height position of the opening end portion of the perforated tube material 1.

  Next, as shown in FIG. 5 (c), pressurized air is injected into the pipe 5, and the air pressure in the sediment accumulation part 3 rises, so that the closing member 4 is pushed upward by the air pressure above the slit part 2. Thus, a part of the plurality of slits 2a of the slit portion 2 is opened. As a result, air flows out into the ground through the plurality of slits 2a. In this state, the marker 6 of the pipe 5 gradually moves away from the open end of the perforated tube material 1 and moves upward.

  Here, since the closing member 4 is pushed up by the air pressure, the air pressure in the slit portion 2 is also high, and therefore it is possible to effectively prevent intrusion of earth and sand from the plurality of slits 2a.

  Further, as shown in FIG. 5 (d), the closing member 4 is pushed upward, the plurality of slits 2a are completely opened, and the air flows out into the ground through the plurality of slits 2a. Become. As a result, the air pressure in the pipe 3 does not increase, and the position of the marker 6 of the pipe 5 is held at a certain height position in the vertical direction.

  Furthermore, the pipe 5 is pushed in, the closing member 4 is lowered, and the air in the perforated tube material 1 is injected into the ground through the plurality of slits 2a.

  Thus, as shown in FIG. 5 (e), when the pipe 5 is pushed down and the marker 6 is lowered and its height position coincides with the height position of the open end of the perforated tube material 1, the blocking member 4. Returns to the initial position in the slit portion 2, and the plurality of slits 2 a of the slit portion 2 are closed by the closing member 4.

  According to this embodiment, after the perforated tube material 1 has penetrated to a predetermined position in the ground with the closing member 4 closing the plurality of slits 2 a of the slit portion 2, the pressurized air is blocked from the pipe 5. Since it is injected into the sediment deposit part 3 below the member 4, the closing member 4 is pushed upward by the air pressure by the air pressure, and a part of the slits 2 a is opened, but from the opened slits 2 a Since the pressurized air flows out into the ground, it is possible to effectively prevent earth and sand from flowing into the perforated tube material 1 from the opened slit 2a. Flows out into the ground, air corresponding to the volume is injected into the space in the slit portion 2 and the sediment depositing portion 3, so that the closing member 4 rises and all the slits 2a of the slit portion 2 are opened. However, pressurization from the slit 2a Air is injected into the ground, and while maintaining this state, the pipe 5 is pushed into the perforated tube material 1 and all the slits 2a of the slit portion 2 are closed by the closing member 4, so there is earth and sand from the slit 2a. It becomes possible to prevent effectively flowing into the hole tube material 1.

  Furthermore, according to this embodiment, compared with the embodiment shown in FIG. 4, the step of supplying pressurized water into the perforated tube material 1 is omitted, so that the cost can be reduced. .

  The selection of whether to supply pressurized water or pressurized air into the perforated pipe 1 is made according to the ground conditions. For the ground where the ground is very loose and soil is likely to enter, It is preferable to use differently so that pressurized water is supplied and pressurized air is supplied to other ground.

  FIG. 6 is a schematic longitudinal sectional view showing a step of driving a perforated tube material 1 according to another preferred embodiment of the present invention into the ground and injecting a predetermined amount of air into the ground.

  In this embodiment, the pipe 5 is not attached to the closing member 4 of the perforated tube material 1, and the closing member 4 includes a coupling member 7 at a portion connected to the pipe 5.

  FIG. 7 is a schematic longitudinal sectional view showing details of a connecting portion between the coupling member 7 and the pipe 5.

  As shown in FIG. 7, the coupling member 7 is constituted by a male coupling 7 a attached to the closing member 4, while a female coupling 5 a is formed at the lower end of the pipe 5 and is connected to each other. ing. The male coupling 7a is provided with a water-stopping O-ring 7b, but other sealing materials can be used instead of the O-ring 7b.

  First, as shown in FIG. 6A, the perforated tube material 1 is penetrated to a predetermined position in the ground in a state where the closing member 4 closes the plurality of slits 2 a of the slit portion 2.

  Next, as shown in FIG. 6B, the pipe 5 is inserted into the perforated tube material 1, and the pipe 5 is connected to the coupling member 7 of the closing member 4. In this state, the height position of the marker 6 attached to the pipe 5 coincides with the height position of the opening end portion of the perforated tube material 1.

  After the pipe 5 is connected to the coupling member 7 of the closing member 4, two to three times as much water as the sum of the inner volume of the slit portion 2 and the inner volume of the sediment accumulation portion 3 is sent into the pipe 5. Then, it is injected into the sediment deposit portion 3 below the closing member 4, and pressurized air is sent into the pipe 5.

  As a result, as shown in FIG. 6C, the closing member 4 is pushed up by water pressure, a part of the plurality of slits 2a of the slit part 2 is opened, and the water is grounded through the slits 2a. Flows out. In this state, the marker 6 of the pipe 5 gradually rises.

  Further, as shown in FIG. 6 (d), the closing member 4 is pushed upward, all the slits 2a are completely opened, and water flows out into the ground through the slits 2a. As a result, the air pressure in the pipe 3 does not increase, and the position of the marker 6 of the pipe 5 is held at a certain height position in the vertical direction.

  When all the slits 2a are completely opened and all the water in the perforated tube 1 flows into the ground, as shown in FIG. 6 (e), air flows into the ground from the plurality of slits 2a. It becomes like this.

  Furthermore, the pipe 5 is pushed down until the height position of the marker 6 attached to the pipe 5 coincides with the height position of the opening end portion of the perforated tube material 1, and the closing member 4 is lowered. The air in the perforated tube material 1 is injected into the ground through the slit 2a.

  Thus, as shown in FIG. 6 (f), the multiple slits 2 a of the slit portion 2 are closed by the closing member 4, and the closing member 4 returns to the initial position in the slit portion 2.

  When the closing member 4 returns to the initial position in the slit portion 2, the coupling member 7 provided in the closing member 4 and the pipe 5 are disconnected, and as shown in FIG. Be taken away.

  In this embodiment, in addition to the effects obtained by the embodiment shown in FIG. 4, the pipe 5 is connected to the closing member 4 by the coupling member 7 and is detachable from the closing member 4. 5 can be reused, thus making it possible to reduce costs.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  For example, in the embodiment shown in FIG. 6, it is configured to send pressurized air into the pipe 5, but the pipe 5 is removed from the coupling member 7 and directly pressed onto the perforated tube material 1. Air can also be sent in.

DESCRIPTION OF SYMBOLS 1 Perforated pipe material 2 Slit part 2a Slit 3 Sediment accumulation part 4 Blocking member 5 Pipe 5a Female coupling 6 Marker 7 Coupling member 7a Male coupling 7b O-ring 11 Perforated pipe material 12 Slit part 12a Slit 13 Hollow pipe 14 Earth and sand

Claims (6)

It has a slit part where a plurality of slits are formed and a sediment deposit part where sediment can be deposited,
A hollow closing member that is slidable with the inner surface of the slit portion and is arranged to close all the plurality of slits;
A pipe member capable of injecting pressurized water or pressurized air into the sediment deposit part below the hollow closing member through the hollow portion of the hollow closing member ;
The hollow blocking member can be moved upward by the pressure of water or air injected into the sediment accumulation part through the pipe member, and can be moved downward by pushing down the pipe member. Perforated pipe material characterized by   The perforated pipe material according to claim 1, wherein the pipe member is fixed in the hollow portion of the hollow closing member.   2. The hollow closure member includes a coupling member on an upper surface thereof, and the pipe member is coupled to the coupling member and connected to the hollow portion of the hollow closure member. The perforated tube material described. It has a slit part in which a plurality of slits are formed, and penetrates a perforated pipe material in which a hollow blocking member is arranged at a position for closing the plurality of slits into the ground,
Using a pipe member, through the hollow part of the closing member, injected pressurized water or pressurized air into the sediment deposit part below the closing member, and pushes up the closing member,
Opening the plurality of slits, causing water or pressurized air pressurized from the plurality of slits to flow into the ground,
With the pressurized water or pressurized air, the hollow closing member is pushed up to open the plurality of slits,
After the injected pressurized water or pressurized air flows out from the plurality of slits into the ground through the pipe member,
By supplying pressurized air into the pipe member, while allowing the pressurized air to flow into the ground from the plurality of slits,
A method for driving a perforated pipe material, wherein the closing member is returned to a position where a plurality of slits of the slit portion are closed.   The perforated tube material driving method according to claim 4, wherein the pipe member is fixed in the hollow portion of the hollow closing member.   5. The hollow closing member includes a coupling member on an upper surface thereof, and the pipe member is connected to the coupling member and connected to the hollow portion of the hollow closing member. The perforated tube material driving method described.

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