JP2005248632A - Liquid injection method, recharge method and chemical grouting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid injection method, a recharge method and a chemical grouting method by which the liquid like the ground water or the chemical is properly injected along a longitudinal direction of a pipe laid in the ground. <P>SOLUTION: Multi-layered well pipes 9a, 9b, 9c, 9d having gaps between the inner parts and the outer parts are laid in a laying hole 8 in the ground in the ascending order of the pipe diameter from the deepest side of the laying hole 8 in a state that the inlets of the well pipes are out of alignment. Thus, the inlets of the well pipes are located at different places in a longitudinal direction of the laying hole, and the liquids fed into the pipes, respectively, are discharged from the inlets of the pipes, respectively, at different places in the longitudinal direction of the laying hole. Packers 10a, 10b, 10c, 10d attached to the well pipes, respectively, are expanded to form a plurality of separate injection areas 11a, 11b, 11c, 11d. Consequently, injection into each injection area is enabled, and the liquid like the ground water or the chemical is properly injected into the ground along the longitudinal direction of the multi-layered well pipes. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for condensing groundwater pumped from the ground and injecting a chemical solution for soil contamination recovery into the ground.

In construction work, underground work, etc., groundwater that springs up during excavation of the ground becomes a work obstacle. For this reason, at the site, the water is once pumped and drained into the sewer, for example, but the groundwater that has been pumped is returned to the ground to reduce the cost of using the sewer and to preserve the groundwater environment. (Patent Document 1). As an example of the specific method, for example, as shown in FIG. 2, a partition wall 1 such as a pile for partitioning a pumping area and a return area is driven into the ground, and a pumping pipe 2 built in the pumping area and a pump outside the figure. To pump up the groundwater W. The pumped-up groundwater W is once stored in the above-ground water storage tank 3 and then recharged from the well pipe 5 having a single pipe structure laid on the ground to the permeable layer of the ground by using a pressure pump 4. In general, the portion corresponding to the ground impermeable layer on the ground side of the well pipe 5 is a packer that prevents backflow of ground water from the gap between the laying hole and the well pipe 5 by chemical injection. Part 6 is formed.
JP 2000-256539 A

  Incidentally, the conventional method shown in FIG. 2 has a problem that it is difficult to control the flow rate of the groundwater W. In other words, the pumped-up groundwater W is sent to the well pipe 5 by the pumping pump 4, but depending on the amount of pressure at the top and bottom of the groundwater level 6, a large amount is ejected at a position close to the groundwater level 6, and the tip from there The amount of water gradually decreases toward the side, and the condensing effect may not be sufficiently obtained in the horizontal portion of the well pipe 5 that is originally intended to be returned. Such a problem is not a problem peculiar to the condensate method as described above, and is similar even when the chemical solution for improving the contamination is injected into the soil contaminated area of the ground using the well pipe 5 as described above. This phenomenon is common to the condensate method.

  The present invention has been made against the background of the prior art as described above. The purpose is to provide a technique capable of appropriately injecting a liquid such as groundwater or a chemical solution along the longitudinal direction of the pipe laid on the ground, that is, a liquid injection method, a condensate method and a chemical solution injection method.

  In order to achieve this object, the present invention relates to a liquid injection method for injecting liquid into the ground through a pipe laid on the ground, and laying at least two or more multiple pipes on the ground where gaps are formed inside and outside. In the hole, the liquid inlets of each pipe are laid out in order of decreasing tube diameter from the back side, and the packer attached to each pipe is pressed against the inner wall of the laying hole so that at least one between adjacent packers. A plurality of injection regions where the inlets of the pipes are opened are partitioned along the longitudinal direction of the laying holes, and liquid is injected into the ground in the injection regions.

  The present invention also relates to a condensate method for returning pumped groundwater to the ground through a well pipe laid on the ground, and laying on the ground with at least two or more multiple well pipes in which gaps are formed inside and outside. In the hole, the inlet of each well pipe is laid out in order of decreasing tube diameter from the back side, and the packer attached to each well pipe is pressed against the inner wall of the laying hole so that at least between adjacent packers A plurality of injection regions where the injection port of one well pipe is opened are sectioned along the longitudinal direction of the laying hole, and ground water is injected into the ground in the injection region.

  Furthermore, the present invention relates to a chemical injection method for injecting a chemical into a ground improvement area through a chemical injection pipe laid on the ground, and forming at least two or more multiple chemical injection pipes on the ground with gaps formed inside and outside. In addition to laying in the laying hole with the injection port of each chemical solution injection pipe shifted from the back in order of decreasing tube diameter, press the packer attached to each chemical solution injection tube to the inner wall of the laying hole and adjoin A plurality of chemical solution injection regions in which an injection port of at least one chemical solution injection tube is opened between the packers are formed along the longitudinal direction of the laying hole, and the chemical solution is injected into the ground in the injection region. .

  In the liquid injection method, the condensate method, and the chemical solution injection method, at least two or more multiple pipes in which a gap is formed inside and outside are formed in the ground laying hole in order of decreasing pipe diameter from the back side of the laying hole. Lay in a state of shifting. Thereby, the inlet of each pipe | tube will be located in a different place in the longitudinal direction of a laying hole. That is, each liquid sent to each tube is discharged from the inlet of each tube at a different location in the longitudinal direction of the laying hole. Then, a packer attached to each pipe is pressed against the inner wall of the laying hole, and a plurality of injection regions in which at least one pipe inlet is opened between adjacent packers are defined along the longitudinal direction of the laying hole. To do. In other words, by providing an entry side and an exit side for each injection region, injection for each injection region is possible, and liquids such as groundwater and chemicals are appropriately injected into the ground along the longitudinal direction of the tube. Can do.

  Thus, in each of the construction methods of the present invention, the injection for each injection region is possible. For this reason, it can comprise as what selectively performs injection | pouring and non-injection about each of a some injection | pouring area | region. Therefore, effective injection is possible by various flexible injection designs according to the ground environment of the construction site. And since injection for every injection | pouring area | region is possible, it can comprise so that the condensate of the groundwater pumped up in a predetermined | prescribed injection | pouring area | region and chemical | medical solution injection | pouring of ground improvement may be performed in another injection | pouring area | region. Therefore, various integration effects such as reduction of duplication labor and reduction of construction cost by integration of different construction methods can be obtained.

  About each above-mentioned construction method, it can constitute so that a packer can expand and contract. According to this, it is possible to easily lay and collect multiple tubes by reducing the packer, and by inflating the packer, it closely adheres to the inner wall of the laying hole by follow-up deformation and has a high packer effect. can get.

  Moreover, this invention is comprised as what forms a laying hole by the flexible excavation method which excavates the ground in the shape of a straight line or a curve about the said liquid injection method and a chemical | medical solution injection method.

  Therefore, since the liquid injection and the chemical liquid injection to a specific place in the ground can be performed, the injection accuracy can be increased and the working efficiency can be improved.

  Further, the present invention relates to the condensate method, in a free excavation method for excavating the ground in a straight line or a curved line, in order from the ground side, laying for a horizontal well having a diagonally curved part and a horizontal straight part It is configured to form a hole.

  Therefore, a horizontal well can be reliably laid at a predetermined position in the aquifer (permeable layer) of the ground having anisotropy.

  In the liquid injection method, the condensate method, and the chemical solution injection method of the present invention, independent flow rate control is possible for each injection region. For this reason, liquids, such as groundwater and a chemical | medical solution, can be suitably inject | poured with respect to the ground along the longitudinal direction of a pipe | tube. In addition, by injection for each tube, it is possible to select injection / non-injection for each injection region, and effective injection can be performed by various flexible injection designs according to the ground environment of the construction site. Furthermore, by injecting each pipe, it is assumed that condensate of the groundwater pumped up in the predetermined injection area, and chemical improvement injection for ground improvement in the other injection areas. Various integration effects such as reduction can be obtained.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a condensate method for returning groundwater to the ground is described in the same manner as in the conventional example of FIG. 2, and the same overlapping description as in the conventional example is omitted.

  As shown in FIG. 1, multiple well pipes 9a, 9b, 9c and 9d are formed in the ground laying holes 8 to form gaps inside and outside. The laying hole 8 of this embodiment is formed by a free excavation method for freely excavating the ground in a straight line and a curved line. Each of the well pipes 9a to 9d is laid so that the tip serving as an inlet for the groundwater W to the ground is located at a different location in the longitudinal direction of the laying hole 8. The rear ends of the well pipes 9a to 9d (the pipe ends reaching the ground) are individually connected to the pumping pump 4, and the ground water W is injected by independent flow control. Therefore, each groundwater W sent to each of the well pipes 9a to 9d is discharged under independent flow control from the inlet at the tip at different locations in the longitudinal direction of the laying holes 8.

  Packers 10a, 10b, 10c, and 10d are attached to the front side of the well tubes 9a to 9d. These expand by the supply of air from the ground via an air supply pipe (not shown), and press contact with the laying hole 8 while following and deforming along the wall surface shape. On the other hand, if this is reduced, the well pipes 9a to 9d can be easily laid and collected without being disturbed.

  When the packers 10a to 10d are expanded and pressed into the laying hole 8 as described above, the well pipes 9a to 9d are supported along the substantially hole axis of the laying hole 8, and the laying hole 8 has its longitudinal length. Independent injection regions 11a to 11d are defined along the direction.

  Specifically, the injection region 11a is partitioned by the packer 10a, from which the groundwater W that is pumped through the well 9a is injected. The injection region 11b is defined by the packers 10a and 10b, from which groundwater W that is pumped through the well 9b is injected. The injection region 11c is defined by packers 10b and 10c, from which groundwater W that is pumped through the well 9c is injected. The injection region 11d is partitioned by the packers 10c and 10d, and from there is injected the groundwater W pumped through the well 9d.

  By such injection for each of the injection regions 11a to 11d, the groundwater W can be appropriately injected into the ground. Further, in this embodiment, since each of the well pipes 9a to 9d is independently connected to the pumping pump 4, strict flow rate control is possible for each of the well pipes 9a to 9d. Therefore, it is possible to vary the injection amount or selectively execute injection / non-injection according to the ground environment around each of the injection regions 11a to 11d. Furthermore, the packer 10d that partitions and forms the injection region 11d in this embodiment also functions as a backpacker for preventing the backflow of the groundwater W, which is formed by consolidation with an impermeable layer of ground as in the conventional example. Therefore, even if the well pipes 9a to 9d are collected, no foreign matter such as a conventional packed packer remains on the ground.

  Further, the well pipes 9a to 9d can be laid in the laying holes 8 from any well pipe 9a to 9d. For example, after the well pipe 9a is first laid, the packer 10a is expanded. If the pipes 10a are laid in the order of pipe laying, packer expansion, pipe laying, packer expansion,... In order from the inner side to the outer side, etc. As the well pipe 9a is supported on the substantially hole axis of the laying hole 8, the tip of the well pipe 9b can be propelled without rubbing against the hole wall of the laying hole 8. Generation | occurrence | production of the breakage, tearing, etc. by sliding of the pipe | tube 9b can be suppressed.

  Various modifications can be made to the embodiment. That is, in the said form, although the condensate construction method was illustrated, it can apply also to the chemical | medical solution injection | pouring method which inject | pours the chemical | medical solution for soil contamination recovery of the ground. In addition, for example, a chemical solution injection method for injecting a chemical solution for ground improvement is performed for the injection region 11d, and a condensate method for injecting groundwater W is performed for the other injection regions 11a to 11c. It can also be implemented as an integrated liquid injection method.

  In the above embodiment, four well tubes 9a to 9d are exemplified. However, the technical idea of forming a plurality of injection regions as described above can be realized by using at least two well tubes. Therefore, if it is two or more, it may not be four.

  For the multiple pipes (injection pipes) to be laid on the ground including the well pipes shown in the above-described form, the material, length pipe diameter, etc. can be appropriately selected according to the construction conditions and the liquid injection conditions.

  In the said form, although the front-end | tip of each well pipe 9a-9d was made into the injection port, a front-end | tip may be covered and an injection port may be formed in an outer peripheral surface. In this case, the packers 10a to 10d are attached at positions farther from the tip than those shown in FIG.

  In the above embodiment, an example is shown in which each well pipe 9a to 9d is connected to the pumping pump 4 and the flow control is performed independently. However, when strict flow control is not required for each well pipe 9a to 9d. Alternatively, the well pipes 9a to 9d may be connected to the pumping pump 4 in a lump or in groups of several.

  In the above embodiment, the packers 10a to 10d are exemplified by those that expand with air, but may be expanded with a liquid such as groundwater W, for example. Moreover, in the said form, although the example which attaches the packers 10a-10d to each well pipe 9a-9d was shown, the more than that may be sufficient.

  In the above embodiment, the laying hole 8 drilled by the universal excavation method is illustrated, but a vertical shaft as a starting shaft (in some cases also a vertical shaft as an arrival shaft) is excavated, and a well pipe is formed horizontally from the vertical shaft. You may make it lay.

Explanatory drawing which shows typically the condensate construction method by one Embodiment. Explanatory drawing which shows typically the condensing method by a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bulkhead 2 Pumping pipe 3 Water storage tank 4 Pumping pump 5 Well pipe 6 Packer part 7 Ground water level 8 Laying hole 9a, 9b, 9c, 9d Well pipe (multiple pipe)
10a, 10b, 10c, 10d Packer 11a, 11b, 11c, 11d Injection region
W groundwater

Claims (6)

In the liquid injection method of injecting liquid into the ground through the pipe laid on the ground,
At least two or more multiplex pipes in which gaps are formed inside and outside are laid in the laying holes formed in the ground in a state where the liquid inlets of the respective pipes are shifted from the back side in order of decreasing pipe diameter. A packer attached to the inner wall of the laying hole is pressed against the inner wall of the laying hole, and a plurality of injection regions in which an injection port of at least one tube is opened between adjacent packers are formed along the longitudinal direction of the laying hole. A liquid injection method characterized by injecting liquid into the ground in the area.   2. The liquid injection method according to claim 1, wherein the laying hole is formed by a free excavation method for excavating the ground in a straight line or a curved line. In the condensate method of returning pumped groundwater to the ground through a well pipe laid on the ground,
While laying at least two or more multiple well pipes in which gaps are formed inside and outside, in the laying hole formed in the ground, with the inlet of each well pipe shifted from the back side in order of decreasing pipe diameter, A packer attached to each well pipe is pressed against the inner wall of the laying hole, and a plurality of injection regions in which at least one well pipe inlet is opened between adjacent packers are defined along the longitudinal direction of the laying hole. And a condensate method for injecting groundwater into the ground in the injection region.   The condensate method according to claim 3, wherein a well digging hole having an obliquely curved portion and a laterally straight portion is formed in order from the ground side by a free excavation method for excavating the ground in a straight line or a curved line. In the chemical injection method that injects the chemical into the ground improvement area through the chemical injection pipe laid on the ground,
At least two or more multiple chemical solution injection pipes with gaps formed inside and outside are laid in the laying hole formed in the ground in a state where the injection ports of the chemical solution injection pipes are shifted from the back side in order of decreasing tube diameter. In addition, a packer attached to each chemical solution injection tube is pressed against the inner wall of the laying hole, and a plurality of chemical solution injection regions in which at least one injection port of the chemical solution injection tube is opened between adjacent packers are arranged in the longitudinal direction of the laying hole. A chemical solution injecting method characterized in that a chemical solution is formed along the line and injected into the ground in the injection region.   The chemical injection method according to claim 5, wherein the laying hole is formed by a free excavation method for excavating the ground in a straight line or a curved line.

Images