JP4679966B2 - Boring hole closing method and equipment - Google Patents

Description

  The present invention relates to a boring hole closing technique in which an injection material is injected into a boring hole to close the boring hole.

  Currently, the ground injection methods include “chemical injection method”, “rock injection method”, “jet grouting method”, “compaction grouting method”, “restoration injection method”, etc. A wide variety of construction methods are used according to construction conditions such as geology and bedrock characteristics.

  For example, in the “rock injection method”, the strength of the rock to be injected is large and the purpose of injection is often “permanently reliable water stop”. Cement-based materials with excellent strength and durability are widely used. However, conventionally, cement milk that has been used as a grout material for the highly water-permeable zone of the dam foundation cannot secure water-stopping for a long period of time of several thousand years or more.

  On the other hand, bentonite is considered to be expected to have long-term stability because it is a clay mineral of natural materials, and has attracted attention as a new grout material.

  However, this bentonite, which is attracting attention as a grout material, does not solidify unlike cement. For this reason, conventionally, there are cases where cement and bentonite are mixed and applied as a grout material, but there are few cases where bentonite alone is applied as a grout material, and the present situation is that it has not been established as a grout technique. In the future, not only bentonite but also a material that does not consolidate or has a slow consolidating speed after completion of injection at an arbitrary location in the borehole as a grout material may be used.

  It is anticipated that the problem of establishing an injection method using “injection material that does not consolidate after injection or an infusion material with a low consolidation speed” such as bentonite as a grout technology is when removing the packer after completion of the injection. It is a point of how to prevent leakage of the injection material such as bentonite slurry injected into the hole.

  As a conventional method for preventing leakage of the injected material, there is a back-filled injection method to improve the surrounding area of the tunnel after lining, and a check valve is used to prevent backflow of the grout material when the grout material is injected. However, since this check valve is used only in the vicinity of the hole, it is necessary to develop a blocking technique for preventing leakage of the injected material after injection at an arbitrary position in the borehole.

  In addition, as a blocking technique for preventing leakage of the injection material, a plugging device using a packer suitable for various injection methods is currently used, but the injection material that does not solidify after injection or injection with a low consolidation speed is used. No occlusion device suitable for the injection method using a material has been developed.

JP2002-97628 JP2002-201630

  The present invention has been proposed in order to solve the above-mentioned problems of the prior art, and its purpose is to use an injecting material that does not consolidate after injection or an injecting material that has a low consolidating speed, and that can be The purpose of the present invention is to provide a borehole closing method and apparatus capable of preventing leakage of the injected material after injection at an arbitrary position in the borehole when injecting into the borehole.

  In order to achieve the above-mentioned object, the present invention installs a residual structure at an arbitrary position in the borehole, injects an injection material into the borehole through the residual mold structure, and then boils the residual structure. The boring hole can be closed at an arbitrary position by filling the caking material in a state of remaining in the hole. This prevents leakage of the injected material after injection at an arbitrary position in the borehole when using an injected material that does not consolidate after injection or an injectable material with a low consolidation speed. it can.

  The boring hole closing method of the present invention is characterized in that the boring hole closing method in which an injection material is injected into the boring hole to close the boring hole has the following structure installation step, injecting step, and closing step. . The structure installation process is a process in which a residual structure having an injection port for an injection material is inserted into a boring hole and installed at an arbitrary position. An injection | pouring process is a process of inject | pouring an injection material in a boring hole through the installed residual type structure after a structure installation process. In the closing step, after the injecting step, with the residual structure remaining in the boring hole, a filling material is filled in the hole side of the injecting section of the injecting material in the boring hole to close the boring hole. It is a process.

  The boring hole closing device of the present invention is a grasp of the above construction method from the viewpoint of the device. In the boring hole closing device that closes the boring hole by injecting an injection material into the boring hole, the following residual type structure: It is characterized by having a body, an injection material, and a consolidation material. The residual structure is a means that has an injection port for an injection material, is inserted into the boring hole, and is installed at an arbitrary position. The injection material is injected into the boring hole through a residual structure that is installed in the boring hole. The consolidated material is filled on the hole side of the injection section of the injection material in the borehole with the residual structure remaining in the borehole after the injection material is injected into the borehole. Means for closing the borehole.

  The specific structure of the residual structure used in the present invention can be selected as appropriate. Desirably, the residual structure is inserted into the borehole at least as the residual structure and provided at the injection port of the injection material. One of a structure including a check valve type packer having a check valve, and a structure including at least an injection pipe inserted into the boring hole and a closing valve installed in a hole of the boring hole Is used.

  According to the present invention having the above-described features, a residual structure having an injection port for an injection material is installed at an arbitrary position in the borehole, and the injection material is injected into the borehole through the residual structure. Thereafter, the boring hole can be closed at an arbitrary position by filling the hole side of the pouring section of the pouring material with the residual structure remaining in the boring hole. Therefore, when injection into the borehole is performed using an injection material that does not solidify after injection or an injection material with a low consolidation speed, leakage of the injection material after injection can be prevented at any position in the borehole. .

  According to the present invention, when an injection material that does not solidify after injection or an injection material with a low consolidation speed is used for injection into the borehole, the injection material after injection at an arbitrary position in the borehole A boring hole closing method and device capable of preventing leakage can be provided.

  Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described with reference to the drawings.

  In the present specification, “injection material having a low consolidation speed” means a material that takes a long time of several weeks, months, or longer, until the consolidation takes place. It is a material that does not consolidate inside. On the other hand, “consolidating material” or “waterproofing material” is generally called “consolidating material” or “waterproofing material”, which takes up to several days at the longest to solidify. It means the general material to be used.

[First Embodiment]
FIG. 1 is a schematic diagram showing a borehole closing method according to a first embodiment to which the present invention is applied. As shown in FIG. 1, the boring hole closing method of the present embodiment is configured such that the check valve type packer 10 of the boring hole closing device 1 is installed at an arbitrary position in the boring hole 3 formed in the ground 2. After injecting an injection material that does not solidify after injection or an injection material 41 having a low consolidation speed into the boring hole 3 through the check valve type packer 10, the check valve type packer 10 remains in the boring hole 3. This is a construction method in which the boring hole 3 is closed by filling the consolidation material 42.

[Device configuration]
The boring hole closing device 1 of this embodiment includes a check valve type packer 10 inserted into the boring hole 3 and remaining therein and a grout pipe 20 having a double pipe structure. Here, the check valve type packer 10 includes a check valve 11 provided at the injection port of the injection material 41 at the insertion tip, a connecting portion 12 provided at the end opposite to the insertion axis direction, and a check. The rubber rubber packing 13 is provided between the valve 11 and the connecting portion 12 and is expandable in the outer circumferential direction.

  The double pipe structure of the grout pipe 20 includes an inner pipe 21 and an outer pipe that can be individually attached to and detached from the connecting portion 12 of the check valve type packer 10 by a simple fitting structure using irregularities and steps. 22 is comprised. The inner pipe 21 is used for inflating the rubber rubber packing 13 of the check valve type packer 10. That is, the check valve type packer 10 is configured to expand the rubber rubber packing 13 in the outer circumferential direction by using the rotation of the inner pipe 21 in a state where the double pipe grouting pipe 20 is connected to the connecting portion 12. ing.

  In the state where the outer pipe 22 is connected to the connecting portion 12 of the check valve type packer 10 after the inner pipe 21 is pulled out, the injection material 41 is injected into the boring hole 3 from the outer pipe 22 through the check valve type packer 10. Used for.

[Procedure of the closure method]
In the present embodiment, using the boring hole closing device 1 as described above, the boring hole is closed according to the procedure shown as (A) to (D) in FIG.

  First, as a structure insertion process in the structure installation process, as shown in FIG. 1A, the check valve type packer 10 is inserted up to an arbitrary section in the boring hole 3 (section for closing the injection material 41). And positioning. In this structure inserting step, the double pipe structure grout pipe 20 is connected to the connecting portion 12 of the check valve type packer 10.

  In this case, the timing of connecting the double pipe structure grout pipe 20 to the check valve type packer 10 is not limited at all, and the check valve type packer 10 is connected in a state where the double pipe structure grout pipe 20 is connected. Alternatively, the grout pipe 20 having a double pipe structure may be connected after the check valve type packer 10 is inserted alone. Alternatively, the inner pipe 21 may be connected after inserting the check valve type packer 10 in which only the outer pipe 22 is connected.

  Next, as a structure fixing process in the structure installation process, as shown in FIG. 1B, a double pipe structure grout pipe 20 is connected to a check valve type packer 10 positioned in an arbitrary section. In this state, by rotating the inner pipe 21 counterclockwise using a tool such as pliers, the rubber rubber packing 13 of the check valve type packer 10 is expanded in the outer peripheral direction and is crimped to the inner wall of the boring hole 3. . In this case, the rubber rubber packing 13 is sufficiently expanded to withstand the injection pressure of the injection material 41.

  In addition, the structure which expands the rubber rubber packing 13 using the rotation of the inner pipe 21 in this way, specifically, for example, as shown in FIGS. 2 to 4, the connecting portion 12 of the check valve type packer 10. Is a relatively rotatable inner / outer dual structure comprising an inner movable part 121 coupled to the inner pipe 21 and an outer fixed part 122 coupled to the outer pipe 22, and the rubber rubber packing 13 is rotated by the rotation of the inner movable part 121. This can be realized by controlling the expansion. In this case, the connection between the inner movable portion 121 and the inner pipe 21 in the rotational direction can be easily realized by an existing technique such as fitting an uneven portion having a polygonal cross section.

  After completion of the installation of the check valve type packer 10 in an arbitrary section by the structure fixing process as shown in FIG. 1B, the structure installation process is completed, and then the structure shown in FIG. An injection process as shown is performed. That is, the inner pipe 21 is pulled out from the check valve type packer 10 and taken out from the boring hole 3. In this state, the outer pipe 22 is used as an injection means, and the boring hole 3 is passed from the outer pipe 22 through the check valve type packer 10. An injection material 41, that is, an injection material that does not solidify after injection or an injection material 41 with a low consolidation speed, is injected into the inner injection section (the inner space of the borehole defined by the installation of the packer). For example, a salt water-bentonite slurry using salt water as a solution can be used as such an injecting material that does not consolidate after injection or an injecting material 41 having a slow consolidating speed.

  After the injection process is completed, as shown in FIG. 1D, the outer pipe 22 is pulled out from the check valve type packer 10 and taken out from the boring hole 3 as a closing process, and only the check valve type packer 10 is reversed. In the state where the stop valve 11 is closed, it is left in the boring hole 3, and in this state, the hole 42 of the check valve type packer 10 is filled with a consolidation material 42 to close the boring hole 3. Note that cement paste or the like can be used as the caking material 42.

[Packer structure example]
2 to 4 are schematic views showing a specific structural example of the check valve type packer 10 of the boring hole closing device 1 according to the first embodiment. As the check valve 11, a ball type check valve is shown. 11a, a rubber sleeve type check valve 11b, and an open / close type check valve 11c are used. 2 to 4, (A) shows a state where the check valve is opened when the injection material 41 is injected, and (B) shows a state where the check valve is closed after the injection material 41 is injected. Yes.

[Injection material]
As described above, in the first embodiment, as the injection material that does not solidify after injection or the injection material 41 with a low consolidation speed, for example, a salt water-bentonite slurry using salt water as a solution is used as described above. In this case, it is desirable to add 4% salt water to the bentonite slurry at the following mixing ratio for setting the mixing ratio of the saltwater-bentonite.

  That is, the setting of the blending ratio of salt water and bentonite is considered to vary depending on the conditions of the construction site (rock type, crack width, crack surface roughness, etc.) and the performance of the injection device (detector, grout pump, etc.). However, considering the relationship between the salinity concentration and the viscosity and the relationship between the mixing ratio of the bentonite slurry and the viscosity, the ratio of the bentonite / 4% salt water should be set so that the mixing ratio is from 1: 8 to 1: 2. Is the most efficient. When the salt water-bentonite slurry having this blending ratio is used, a slurry having a high bentonite concentration can be filled in the crack, and as a result, excellent water permeability can be exhibited.

[effect]
According to the first embodiment as described above, the packer having the check valve is installed at an arbitrary position in the boring hole by the expansion of the rubber rubber packing and the anchor bolt, and the injection material is injected into the boring hole through the packer. Then, the boring hole can be blocked at an arbitrary position by allowing the packer to remain in the boring hole with the check valve closed and filling the packing material on the hole side of the packer in this state. Therefore, when injecting into the borehole using an injection material that does not solidify after injection, such as salt water-bentonite slurry, or an injection material with a low consolidation speed, injection after injection at an arbitrary position in the borehole Leakage of material can be prevented.

  Moreover, the procedure in the closing method of the present embodiment is an extremely simple procedure that only inserts the packer, pulls out the pipe, injects the injection material, fills the consolidated material, etc., except for fixing the packer by rotating the pipe. Therefore, the work efficiency is excellent. Moreover, since the boring hole closing device of this embodiment has a simple configuration combining a check valve type packer and a double pipe structure grout pipe, it is easy to handle the device, and the apparatus is installed in the boring hole. Is also possible in a short time and is also economical.

[Modification]
As a modification of the first embodiment, the inner member may be configured as a rotating member of another shape instead of the double pipe structure grout pipe 20. In other words, the outer pipe 22 needs to be tubular in order to inject the injection material, but the inner pipe 21 is not necessarily tubular because it is used only for expanding the rubber rubber packing 13 by rotation. It is not necessary and can be changed to a simple rod-shaped member, for example.

[Second Embodiment]
FIG. 5 is a schematic view showing a boring hole closing method according to a second embodiment to which the present invention is applied. As shown in FIG. 5, the boring hole closing method according to the present embodiment sets the residual type composite member 50 of the boring hole closing device 5 having a configuration different from that of the first embodiment at an arbitrary position in the boring hole 3. This is a method of filling the water stop material 43 that fills the gap between the residual composite member 50 and the inner wall of the boring hole 3. Then, after injecting an injection material that does not solidify after injection or an injection material 41 having a low consolidation speed into the boring hole 3 through the residual type composite member 50, the residual type composite member 50 is placed in the bore hole 3 and in the hole. This is a construction method in which the boring hole 3 is closed by filling the caking material 42 in the state of remaining.

[Device configuration]
In the boring hole closing device 5 of the present embodiment, the residual type composite member 50 that remains in the boring hole 3 and in the boring hole is a check valve type packer 51 inserted into the boring hole 3 and the boring hole of the boring hole 3. , A grout pipe (injection pipe) 53 for fixedly connecting between the check valve type packer 51 and the hole member 52, and a rubber rubber 54.

  Here, the check valve type packer 51 is configured as a single check valve. The hole member 52 includes a tubular portion coaxial with the grout pipe 53 and a fixing flange portion orthogonal to the tubular portion. Here, as shown in FIG. 5E, an air vent hole 521, a water stop material injection hole 522, and a bolt hole 523 are provided in the fixing flange portion of the hole member 52. Further, a hole-stop water packing 61 is inserted between the fixing flange portion of the hole-portion member 52 and the surface of the ground 3. The hole-stop water packing 61 is provided with an air-release hole 611 and a water-stop material injection hole 612 at a position overlapping the air-release hole 521 and the water-stop material injection hole 522 of the hole member 52.

  The grout pipe 53 is used to inject the injection material 41 into the boring hole 3 through the check valve type packer 51 and fills the space between the check valve type packer 51 and the hole stop water packing 53. It is used to fill the consolidated material 42 and the water stop material 43 for the purpose. The rubber rubber 54 is provided at a connection end of the grout pipe 53 with the check valve type packer 51 in order to define a filling range of the water stop material 43, and is configured to be crimped to the inner wall of the boring hole 3.

  The boring hole closing device 5 further includes an air vent hose 62 inserted into the air vent holes 521 and 611, a plug 63 for closing the air vent holes 521 and 611 and a water stop material injection hole 522 and 612, and a hole member 52. And an anchor bolt 64 that fixes the hole-stop water packing 61 to the hole, an injection hose 65 that can be attached to and detached from the hole member 52, and a plug 66 that closes the opening of the hole member 52. The injection hose 65 is used for injecting the injection material 41 into the boring hole 3 through the check valve type packer 51 from the injection hose 65 and the grout pipe 53 while being connected to the hole member 52.

[Procedure of the closure method]
In the present embodiment, using the boring hole closing device 5 as described above, the boring hole is closed according to the procedure shown as (A) to (D) in FIG.

  First, as a structure insertion process in the structure installation process, as shown in FIG. 5A, a check valve type packer 51, a hole member 52, a grout pipe 53, and a rubber rubber 54 are integrally connected. The residual type composite member 50 is inserted into the boring hole 3 and positioned in an arbitrary section. In this case, the hole-stop water packing 61 is mounted in advance around the tubular portion of the hole member 52, and the flange portion of the hole member 52 and the surface of the ground 3 are abutted via the hole-stop water packing 61. The An arbitrary section can be freely set by adjusting the length of the grout pipe 53. Further, in this structure inserting step, the air vent hose 62 is inserted into the air vent holes 521 and 611 of the hole mouth member 52 and the hole mouth water-stop packing 61 so as to extend to the tip of the grout pipe 53. deep.

  The timing of connecting the residual composite member 50 is not limited in any way. For example, after inserting only the check valve type packer 51, the grout pipe 53 with the rubber rubber 54 and the hole member 52 are connected. Or after inserting only the structure which connected grout pipe 53 with rubber rubber 54 to check valve type packer 51, hole member 52 may be connected.

  Next, as a structure fixing step in the structure installing step, as shown in FIG. 5B, the fixing flange portion of the hole member 52 of the residual composite member 50 positioned in an arbitrary section is used as an anchor bolt. 64, the water stop material 43 is injected from the water stop material injection holes 522 and 612 of the hole opening member 52 and the hole stop water packing 61, and the air release hole 521 is passed through the air release hose 62. While removing air from 611, the water stop material 43 is filled so as to fill a gap between the grout pipe 53 and the inner wall of the boring hole 3 in an arbitrary section.

  When the water stop material 43 is filled, the rubber rubber 54 provided on the grout pipe 53 presses against the inner wall of the boring hole 3, so that the water stop material 43 passes over the rubber rubber 54 and enters the injection section of the injection material 41. Can be prevented. After filling the water stop material 43, the air vent holes 521, 611 and the water stop material injection holes 522, 612 are closed with the plug 63. In this case, the air bleeding hose 62 may be pulled out after bleeding, but may be left in the water blocking material 43 as it is. In addition, as the water stop material 43, a cement paste etc. can be used, for example.

  After the structure fixing process as shown in FIG. 5B, the installation of the residual composite member 50 including the check valve type packer 51 in an arbitrary section is completed. Therefore, after the structure installation process is completed, An implantation step as shown in FIG. That is, the injection hose 65 is connected to the hole member 52 of the residual type composite member 50, and the hole member 52, the grout pipe 53, and the check valve type packer 51 of the residual type composite member 50 are connected from this injection hose 65. The injection material that does not solidify after injection or the injection material 41 with a low solidification rate is injected into the injection section in the borehole 3 through. In this case, as the injection material 41, for example, the same salt water-bentonite slurry as in the first embodiment can be used.

  After completing the injection process, as a closing process, as shown in FIG. 5D, the injection hose 65 is removed from the residual composite member 50, and the caking material 42 is embedded so as to fill the internal space of the grout pipe 53. After filling, a closing plug 66 is attached to the opening of the hole port member 52 to close the boring hole 3. In addition, as the caking material 42, the cement paste etc. which are similar to 1st Embodiment can be used, for example.

[Packer structure example]
FIGS. 6 to 8 are schematic views showing specific structural examples of the check valve type packer 51 of the boring hole closing device 5 according to the second embodiment. The case where it comprises as each of the stop valve 51a, the rubber sleeve type check valve 51b, and the on-off type check valve 51c is shown. 6 to 8, (A) shows a state where the check valve is opened when the injection material 41 is injected, and (B) shows a state where the check valve is closed after the injection material 41 is injected. Yes. Further, in this embodiment, the grout pipe 53 is left together with the check valve type packer 51, so that the connecting portion between the check valve type packer 51 and the grout pipe 53 is firmly connected by screw fitting or the like. It has become.

[effect]
According to the second embodiment as described above, a residual composite member including a packer and a grout pipe configured as a check valve is installed at an arbitrary position in the borehole by filling with a water stop material and an anchor bolt. After injecting the injecting material into the boring hole, the residual type composite member is left in the boring hole with the check valve closed, and in this state, the caulking pipe is filled with the solidified material, so that the boring hole Can be closed at any position. Therefore, as in the first embodiment, when injection into the borehole is performed using an injection material that does not solidify after injection, such as a salt water-bentonite slurry, or an injection material with a low consolidation speed, It is possible to prevent leakage of the injected material after injection at any position.

  In addition, the procedure in the closing method according to the present embodiment includes a process of fastening anchor bolts and a process of filling a water stop material when installing the residual composite member, and thus is more complicated than the first embodiment. In particular, by filling the inside and outside of the residual composite member fixed with anchor bolts with a solidifying material and a water-stopping material, the mechanical strength and the water-stopping property are high, and therefore reliable. High boring hole blocking structure can be realized.

[Third Embodiment]
FIG. 9 is a schematic diagram showing a boring hole closing method according to a third embodiment to which the present invention is applied. As shown in FIG. 9, the boring hole closing method according to the present embodiment includes a closing hole 71 configured to have a closing valve 71 that covers the opening of the grout pipe 53 instead of the check valve type packer 51 in the second embodiment. This is a construction method in which the hole of the boring hole 3 is closed by using the device 7 to fill the internal space of the grout pipe 53 with the consolidated material 42 and close the closing valve 71.

[Device configuration]
In the boring hole closing device 7 of the present embodiment, as shown in FIGS. 9A to 9D, instead of the residual composite member 50 including the check valve type packer 51 in the second embodiment, The residual type composite member 70 formed by integrally connecting the hole member 52, the grout pipe 53, the rubber rubber 54, and the closing valve 71 is used. Here, when the operating axis of the operating lever 711 is parallel to the valve body axis, as shown in FIGS. 9B and 9C, the closing valve 71 is in accordance with the rotation angle of the operating lever 711. As shown in FIG. 9D, when the operation axis of the operation lever 711 is orthogonal to the valve body axis, the valve is closed.

  Except for the difference of the residual composite member 70, other configurations are the same as those of the second embodiment, and therefore, the same parts are denoted by the same reference numerals and detailed description thereof is omitted. 9E shows a hole member 52 provided with an air vent hole 521, a water stop material injection hole 522, and a bolt hole 523, as in FIG. 5E.

[Procedure of the closure method]
In the present embodiment, using the boring hole closing device 7 as described above, the boring hole is closed according to the procedure shown as (A) to (D) in FIG.

  First, as a structure insertion process in the structure installation process, as shown in FIG. 9A, a residual mold formed by integrally connecting a hole member 52, a grout pipe 53, a rubber rubber 54, and a closing valve 71. The composite member 70 is inserted into the boring hole 3 and positioned in an arbitrary section. In this case, a point where the flange portion of the hole member 52 and the surface of the ground 3 are abutted with each other through the hole-sealing gasket 61 mounted in advance around the tubular portion of the hole member 52, or the hole member 52. In the same manner as the second embodiment, the air vent hose 62 is inserted into the air vent holes 521 and 611 of the hole stop water packing 61 and installed so as to extend to the tip of the grout pipe 53.

  Note that the timing of connecting the residual composite member 70 is not limited in any way. For example, after the closing valve 71 is connected to the hole member 52 in advance and the grout pipe 53 with the rubber rubber 54 is inserted, the residual composite member 70 has already been connected. The hole member 52 and the closing valve 71 which are integrated may be connected to the grout pipe 53, or other members may be sequentially connected after the grout pipe 53 with the rubber rubber 54 is inserted. Alternatively, the closing valve 71 may be connected after inserting the grout pipe 53 with the rubber rubber 54 and the hole member 52 in a connected state. Furthermore, the blocking valve 71 may be connected to the hole member 52 when the hole member 52 is fixed to the ground 3 with the anchor bolt 64 as shown in FIG.

  Next, as a structure fixing step in the structure installation step, as shown in FIG. 9B, the flange portion of the hole member 52 of the residual type composite member 70 positioned in an arbitrary section is fixed by an anchor bolt 64. After fixing to the surface of the ground 3, the water stop material 43 is injected from the hole stop member 52 and the water stop material injection holes 522 and 612 of the hole stop water packing 61, and the grout pipe 53 and the bore hole 3 in an arbitrary section are injected. The point which fills the water stop material 43 so that the clearance gap with an inner wall may be filled is the same as that of 2nd Embodiment. Further, since the rubber rubber 54 is pressure-bonded to the inner wall of the boring hole 3 when the water-stopping material 43 is filled, the water-stopping material 43 can be prevented from entering the injection section of the injection material 41 beyond the rubber rubber 54. As described above with reference to the second embodiment.

  After completion of the installation of the residual composite member 70 in an arbitrary section by the structure fixing process as shown in FIG. 9B, and after completing the structure installation process, as shown in FIG. Such an injection process is performed. That is, the injection hose 65 is connected to the closing valve 71, the closing valve 71 is opened, and the injection is not solidified after injection from the injection hose 65 through the closing valve 71 and the grout pipe 53 into the injection section in the borehole 3. A material or an injection material 41 having a low consolidation speed is injected.

  After completing the injection step, as a closing step, as shown in FIG. 9D, the consolidated material 42 is injected into the grout pipe 53 through the closing valve 71 from the injection hose 65, and the inner space of the grout pipe 53 is filled. After filling the consolidation material 42 so as to fill, the closing valve 71 is closed, the injection hose 65 is removed from the closing valve 71, and the boring hole 3 is closed.

[effect]
According to the third embodiment as described above, the residual composite member including the grout pipe and the closing valve is installed at an arbitrary position in the borehole by filling the waterstop material and the anchor bolt, and the borehole is inserted into the borehole. After the injection material is injected and the grout pipe is left in the borehole, the grout pipe is filled with the solidified material, and then the closing valve is closed to close the borehole at an arbitrary position. Therefore, similarly to the first and second embodiments, when injecting into the borehole using an injection material that does not solidify after injection, such as salt water-bentonite slurry, or an injection material with a low consolidation speed, It is possible to prevent leakage of the injected material after injection at an arbitrary position in the borehole.

  Moreover, since the procedure in the closing method according to the present embodiment includes a step of fastening anchor bolts and a step of filling a water stop material when installing the residual composite member, as in the second embodiment, Although the procedure is more complicated than that of the first embodiment, in particular, by filling the inside and outside of the residual composite member fixed by anchor bolts with a consolidated material and a water stop material, the mechanical strength and the It is possible to realize a boring hole closing structure that is highly water-based and therefore highly reliable. Furthermore, since it is the structure which arrange | positions the obstruction | occlusion valve in the hole opening of a boring hole, there also exists an advantage that the obstruction | occlusion valve of arbitrary dimensions can be used freely irrespective of the dimension of a boring hole.

[Fourth Embodiment]
FIG. 10 is a schematic diagram showing a borehole closing method according to a fourth embodiment to which the present invention is applied. As shown in FIG. 10, the boring hole closing method of this embodiment is a valve that covers the expansion packer 81 and the closing valve 71 instead of the grout pipe 53 and the hole port member 52 with the rubber rubber 54 in the third embodiment. This is a method of closing the hole of the boring hole 3 by closing the closing valve 71 using the boring hole closing device 8 having the closing member 82 and then filling the periphery with the caking material 42. .

[Device configuration]
In the boring hole closing device 8 of the present embodiment, as shown in FIGS. 10A to 10D, instead of the residual composite member 70 in the third embodiment, an expansion packer 81 and a retrofit blockage are provided. The residual type composite member 80 formed by finally connecting the valve 71 and the valve closing member 82 integrally is used.

  Here, the expansion packer 81 is a single packer in which a packer portion 811 having a rubber rubber packing 13 that can expand in the outer circumferential direction and a grout pipe portion 812 are integrally formed in advance, and the rotation of the grout pipe portion 812 is used. Thus, the rubber rubber packing 813 is configured to expand in the outer peripheral direction. An operation portion 814 for rotating operation is provided on the outer periphery of the end portion on the hole opening side of the grout pipe portion 812.

  Further, as shown in FIG. 10E, the valve closing member 82 includes a housing-like main body portion covering the closing valve 71 installed at the hole of the boring hole 3 and a fixing flange portion. In the main body portion, an air vent hole 821 and a binder injection hole 822 are provided, and an air vent hose 823 is attached to the air vent hole 821 in advance. A hole-stop water packing 61 a is inserted between the fixing flange portion of the valve closing member 82 and the surface of the ground 3.

  In this case, in the boring hole closing device 8 of the present embodiment using the expansion packer 81 with the rubber rubber packing 13, since the water stop material 43 is not used, the hole stop water packing 61 a is provided with only bolt holes. No air vent hole or water stop material injection hole is provided. The boring hole closing device 8 further includes a closing plug 63a that closes the air vent hole 821 and the binder injection hole 822 of the valve closing member 82.

[Procedure of the closure method]
In the present embodiment, using the boring hole closing device 8 as described above, the boring hole is closed according to the procedure shown as (A) to (D) in FIG.

  First, as a structure insertion process in the structure installation process, as shown in FIG. 10A, the expansion packer 81 of the residual composite member 80 is inserted and positioned to an arbitrary section in the boring hole 3.

  Next, as a structure fixing step in the structure installing step, as shown in FIG. 10B, by rotating the operation portion 814 of the expansion packer 81 positioned in an arbitrary section, the rubber rubber packing of the expansion packer 81 is rotated. 813 is expanded in the outer circumferential direction and is crimped to the inner wall of the borehole 3. In this case, the rubber rubber packing 813 is sufficiently expanded to withstand the injection pressure of the injection material 41. Subsequently, the closing valve 71 is connected to the hole side end of the expansion packer 81 so as to cover the opening.

  After the structure fixing process as shown in FIG. 10B, the installation of the expansion packer 81 in an arbitrary section and the connection of the closing valve 71 to the expansion packer 81 are completed, and thus the structure installation process is completed. Then, an implantation step as shown in FIG. That is, the injection hose 65 is connected to the closing valve 71 so that the closing valve 71 is opened, and the injection is not solidified after injection from the injection hose 65 to the injection section in the boring hole 3 through the closing valve 71 and the expansion packer 81. A material or an injection material 41 having a low consolidation speed is injected.

  After completing the injection process, a closing process as shown in FIG. In this closing process, first, the closing valve 71 is closed, the injection hose 65 is removed from the closing valve 71, and then the valve closing member 82 is disposed so as to cover the closing valve 71. The valve closing member 82 is fixed to the surface of the ground 3 with the anchor bolt 64 in this state.

  In the closing process, next, the sealing material 42 is injected into the valve closing member 82 from the sealing material injection hole 822 of the valve closing member 82, and the valve is closed while the air is released from the air releasing hole 821 through the air bleeding hose 823. The boring hole 3 is closed by filling the consolidated material 42 so as to fill the periphery of the closing valve 71 in the internal space of the member 82. It should be noted that the air vent hole 821 and the binder injection hole 822 of the valve closure member 82 are closed by the closure plug 63 a after filling the binder 42.

[effect]
According to the fourth embodiment as described above, the residual composite member including the expansion packer and the closing valve is installed at an arbitrary position in the boring hole by the expansion of the rubber rubber packing and the anchor bolt, and injected into the boring hole. The boring hole can be arbitrarily set by injecting material, closing the closing valve with the expansion packer remaining in the boring hole, installing a valve closing member that covers the closing valve, and filling the internal space with the consolidated material. It can be closed at the position. Therefore, as in the first to third embodiments, when using an injection material that does not solidify after injection, such as a salt water-bentonite slurry, or an injection material with a low consolidation speed, the injection into the borehole is performed. It is possible to prevent leakage of the injected material after injection at an arbitrary position in the borehole.

  In addition, the procedure in the closing method of the present embodiment includes a step of fastening the anchor bolt when installing the valve closing member, and thus is a complicated procedure compared to the first embodiment. By fixing the valve closing member that covers the closing valve installed in the hole with an anchor bolt and filling the internal space with a caking material, the mechanical strength and water-stopping property are high, and therefore a reliable boring hole A closed structure can be realized. Further, since the closing valve is arranged in the hole of the boring hole, similarly to the third embodiment, the closing valve of any size and shape can be used freely regardless of the size of the boring hole. There is also an advantage.

[Modification]
In addition, as a modification of the fourth embodiment, instead of the expansion packer formed integrally in advance, the packer and grout pipe configured individually as in the first embodiment are connected, and both are connected. A configuration in which it remains in the borehole is also possible.

[Other Embodiments]
The present invention is not limited to the above-described embodiments, and various other modifications can be implemented within the scope of the present invention.

  For example, in the above-described embodiment, the case of using a salt water-bentonite slurry, a consolidated material, and a cement paste as a water-stopping material as an injection material has been described. The specific material to be selected can be freely selected according to the material injection purpose exemplified in the embodiment and the conditions at the construction site.

  In addition, the specific configuration of each means including the residual structure to be inserted into the boring hole can be selected as appropriate, and depending on the specific configuration of the device to be used and the means constituting the blockage method, The specific procedure is different. That is, according to the present invention, the residual structure is installed at an arbitrary position in the borehole, and after the injection material is injected into the borehole through the residual mold structure, the residual structure is left in the borehole. As long as the solidified material is filled in a state, specific procedures, apparatus configurations, and materials to be used can be selected as appropriate.In such various modifications, the same excellent effects as those of the above-described embodiment can be obtained. It is obtained.

The schematic diagram which shows the boring hole obstruction | occlusion method which concerns on 1st Embodiment to which this invention is applied. The schematic diagram which shows an example at the time of using a ball-type check valve as a specific structural example of the check valve-type packer according to the first embodiment. The schematic diagram which shows an example at the time of using a rubber sleeve type check valve as a specific structural example of the check valve type packer which concerns on 1st Embodiment. The schematic diagram which shows an example at the time of using an on-off type check valve as a specific structural example of the check valve type packer according to the first embodiment. The schematic diagram which shows the boring hole obstruction | occlusion method which concerns on 2nd Embodiment to which this invention is applied. The schematic diagram which shows an example at the time of using a ball-type check valve as a specific structural example of the check valve type packer which concerns on 2nd Embodiment. The schematic diagram which shows an example at the time of using a rubber sleeve type check valve as a specific structural example of the check valve type packer which concerns on 2nd Embodiment. The schematic diagram which shows an example at the time of using an on-off type check valve as a specific structural example of the check valve type packer according to the second embodiment. The schematic diagram which shows the boring hole obstruction | occlusion method which concerns on 3rd Embodiment to which this invention is applied. The schematic diagram which shows the boring hole obstruction | occlusion method which concerns on 4th Embodiment to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 5, 7, 8 ... Boring hole obstruction | occlusion device 2 ... Ground 3 ... Boring hole 41 ... Injection material 42 ... Solidification material 43 ... Water stop material 10 ... Check valve type packer 11 ... Check valve 12 ... Connection part 121 ... inner movable part 122 ... outer fixed part 13 ... rubber rubber packing 20 ... double pipe structure grout pipe 21 ... inner pipe 22 ... outer pipes 50, 70, 80 ... residual type composite member 51 ... check valve type packer 52 ... hole Mouth member 53... Grout pipe 54. Rubber rubber 61, 61 a. Hole sealing water seal 62. Air release hose 63, 63 a, 66. Blocking plug 64. Anchor bolt 65. ... Expansion packer 811 ... Packer part 812 ... Grout pipe part 813 ... Rubber rubber packing 814 ... Operating part 82 ... Valve closing member

Claims (24)

In the boring hole closing method that closes the boring hole by injecting injection material into the boring hole,
The section from the back side to the hole opening side of the hole closing the boring hole by the injection material is determined, and the residual structure having the injection hole of the injection material is determined as the hole in the determined section in the boring hole. Insert the structure to the mouth side and install the structure.
After the structure installation step, an injection step of injecting the injection material into the borehole through the installed residual structure,
After the injecting step, with the residual structure remaining in the borehole, a solidification material is filled in the hole opening side of the injection section of the injectant in the borehole to close the borehole. A boring hole closing method characterized by having a closing step. The residual structure is a structure including a check valve type packer having a check valve that is inserted at least into the hole side of the determined section in the boring hole and provided at the injection port of the injection material. 2. The boring according to claim 1, wherein the boring is at least one of an injection pipe inserted into the boring hole and a structure including a closing valve installed at a hole of the boring hole. Hole closing method. The residual type structure is inserted up to the hole side of the determined section in the boring hole, and has a check valve provided at the injection port and a check valve provided at the injection port. Including
Using an injection pipe that is removable with respect to the check valve type packer,
The structure installation step includes the step of inserting the check valve type packer into the boring hole, and the check valve type packer at an arbitrary position in a state where the injection pipe is connected to the check valve type packer. Including the process of installing in
The injection step includes a step of injecting the injection material into the boring hole through the check valve type packer from the injection pipe,
In the closing step, the injection pipe is pulled out from the check valve type packer and taken out from the boring hole, and the check valve type packer is left in the boring hole. 3. The boring hole closing method according to claim 2, further comprising a step of filling the consolidated material on a hole side of the check valve type packer. The check valve type packer has an outer peripheral packing that can expand in the outer peripheral direction,
Using a double structure member consisting of an inner rotary member that can be individually attached to and detached from the check valve type packer and an outer injection pipe,
The structure installation step includes the step of inserting the check valve type packer into the boring hole, and the reverse structure by rotating the rotating member in a state where the double structural member is connected to the check valve type packer. A step of installing the check valve type packer at an arbitrary position by inflating the outer peripheral packing of the check valve type packer and press-fitting it on the inner wall of the boring hole; and after the installation, the rotating member is attached to the check valve type packer The boring hole closing method according to claim 3, further comprising a step of drawing out from the boring hole.   The boring hole closing method according to claim 4, wherein the double structure member is a pipe having a double pipe structure including an inner pipe and an outer pipe. The residual type structure is inserted up to the hole side of the determined section in the boring hole, and has a check valve provided at the injection port and a check valve provided at the injection port. The injection pipe inserted into the borehole, and a hole member installed at the hole of the borehole,
The check valve type packer is configured to be integrally connected to one end of the injection pipe in the axial direction, and the hole member is integrally connected around the other end of the injection pipe. Configured to
In the structure installation step, the check valve type packer is inserted into the boring hole and positioned at an arbitrary position, and the injection pipe and the hole port member are integrated with the check valve type packer. Including the step of fixing the hole member to the hole of the boring hole in a connected state,
The injection step includes a step of injecting the injection material into the boring hole through the injection pipe and the check valve type packer,
The closing step includes a step of filling the consolidated material so as to fill an internal space of the injection pipe in a state where the check valve type packer and the injection pipe remain in the boring hole. The boring hole closing method according to claim 2.   7. The check valve according to claim 2, wherein the check valve is a check valve selected from a ball type check valve, a rubber sleeve type check valve, and an open / close type check valve. The boring hole closing method according to claim 1. The residual structure includes the injection pipe inserted into the boring hole, a hole member installed at a hole of the boring hole, and the closing valve.
The injection pipe is configured to be inserted into the boring hole with one end as an insertion tip, and the hole member is configured to be integrally connected around the other end of the injection pipe. The closing valve is integrally connected to the other end of the injection pipe and configured to close the opening;
The structure installation step includes inserting the injection pipe into the boring hole and positioning the injection pipe in an arbitrary position, and connecting the hole opening member integrally with the injection pipe. Fixing to the hole of the boring hole, and installing the closing valve so as to cover the opening of the injection pipe,
The injection step includes the step of injecting the injection material into the boring hole through the block valve and the injection pipe with the block valve open.
In the closing step, the injection pipe is left in the boring hole, and the closing valve is opened, and the solidification material is filled so as to fill the internal space of the injection pipe through the closing valve. The boring hole closing method according to claim 2, comprising a step and a step of closing the closing valve.   The boring hole according to claim 6 or 8, wherein the structure installation step includes a step of filling a water stop material so as to fill a gap between the injection pipe and an inner wall of the boring hole. Blocking method. The residual structure includes a packer and an injection pipe inserted to the hole side of the determined section in the boring hole, a closing valve installed in the hole of the boring hole, and a valve closing member. Including
The packer is configured to be integrally connected to one end of the injection pipe in the axial direction, and the closing valve is integrally connected to the other end of the injection pipe to close the opening. The valve closing member is configured to form a space filled with the consolidated material around the closing valve,
The structure installation step includes the step of inserting the packer into the borehole, the step of installing the packer at an arbitrary position in a state where the injection pipe is integrally connected to the packer, and the injection Including the step of installing the closing valve so as to cover the opening of the pipe for use;
The injection step includes the step of injecting the injection material into the boring hole through the block valve, the injection pipe and the packer with the block valve open.
The closing step includes the step of closing the closing valve, and the valve closing member is disposed so as to cover the closing valve in a state where the packer and the injection pipe are left in the borehole, The boring according to claim 2, comprising a step of fixing the valve closing member to the hole of the boring hole and a step of filling the caking material so as to fill an internal space of the valve closing member. Hole closing method. The packer has an outer peripheral packing that is expandable in the outer peripheral direction,
In the structure installation step, the outer packing of the packer is expanded by rotating the injection pipe in a state where the packer is inserted into the borehole and the injection pipe is connected to the packer. The boring hole closing method according to claim 10, further comprising a step of installing the packer at an arbitrary position by pressure bonding to the inner wall of the boring hole.   The boring hole closing method according to claim 11, wherein the packer is a packer with an injection pipe to which the injection pipe for operating the outer periphery packing by rotation is integrally attached in advance. In the boring hole closing device that closes the boring hole by injecting an injection material into the boring hole,
A residual structure that has an injection port for the injection material, is inserted up to a hole side of an injection section of the injection material to be injected into the borehole , and is installed;
The injection material injected into the borehole through the residual structure in a state of being installed in the borehole;
After the injection material is injected into the boring hole, the residual structure remains in the boring hole and is filled into the hole side of the pouring section of the injection material in the boring hole. A boring hole closing device comprising a consolidated material for closing the boring hole. The residual structure is a structure including a check valve type packer having a check valve that is inserted at least into the hole side of the determined section in the boring hole and provided at the injection port of the injection material. The boring according to claim 13, wherein the boring is at least one of an injection pipe inserted into the boring hole and a structure including a closing valve installed at a hole of the boring hole. Hole closure device. The residual type structure is inserted up to the hole side of the determined section in the boring hole, and has a check valve provided at the injection port and a check valve provided at the injection port. Including
An injection pipe detachable from the check valve type packer;
The check valve type packer is configured to be inserted into the boring hole and installed at an arbitrary position in a state where the injection pipe is connected,
The injection pipe injects the injection material into the boring hole through the check valve type packer, and is drawn out of the check valve type packer after the injection material is injected and taken out from the boring hole. Configured,
The said consolidated material is filled in the hole side of the said check valve packer in the said boring hole in the state in which the said check valve type | mold packer remained in the said boring hole. The boring hole closing device as described. The check valve type packer has an outer peripheral packing that can expand in the outer peripheral direction,
A double structure member comprising an inner rotating member and an outer injection pipe that can be individually attached to and detached from the check valve type packer;
The check valve type packer is configured to expand the outer peripheral packing by rotation of the rotating member in a state where the check valve type packer is inserted into the boring hole and the double structural member is connected.
The bore of the boring hole according to claim 15, wherein the rotating member is configured to be pulled out from the check valve type packer and taken out from the boring hole after the check valve type packer is installed. apparatus.   The boring hole closing device according to claim 16, wherein the double structure member is a pipe having a double pipe structure including an inner pipe and an outer pipe. The residual type structure is inserted up to the hole side of the determined section in the boring hole, and has a check valve provided at the injection port and a check valve provided at the injection port. The injection pipe inserted into the boring hole, and a hole member installed at the hole of the boring hole,
The check valve type packer is configured to be integrally connected to one end of the injection pipe in the axial direction, and the hole member is integrally connected around the other end of the injection pipe. Configured to
The hole member is positioned at an arbitrary position by inserting the check valve type packer into the boring hole, and the hole member is integrated with the injection pipe and the check valve type packer. In a connected state, it is configured to be fixed to the hole of the boring hole,
15. The consolidated material is filled so as to fill an inner space of the injection pipe in a state where the check valve type packer and the injection pipe remain in the borehole. A boring hole closing device according to claim 1.   The check valve according to any one of claims 14 to 18, wherein the check valve is a check valve selected from a ball type check valve, a rubber sleeve type check valve, and an open / close type check valve. The boring hole closing device according to claim 1. The residual structure includes the injection pipe inserted into the boring hole, a hole member installed at a hole of the boring hole, and the closing valve.
The injection pipe is configured to be inserted into the boring hole with one end as an insertion tip, and the hole member is configured to be integrally connected around the other end of the injection pipe. The closing valve is integrally connected to the other end of the injection pipe and configured to close the opening;
The hole member is inserted into the boring hole, positioned at an arbitrary position, and the hole member is integrally connected to the pouring pipe. It is configured to be fixed to the hole of the
The closing valve is installed so as to cover the opening of the injection pipe, and when the injection material is injected, the injection valve is opened and the injection material is put into the boring hole through the closing valve and the injection pipe. When filling and filling the caking material, the closing valve is opened and the caulking valve is filled with the caking material through the closing valve. After filling the caking material, the closing material is closed. Configured to be in a state,
The solidified material is filled so as to fill an internal space of the injection pipe through the closed valve that is opened with the injection pipe remaining in the borehole. Item 15. The boring hole closing device according to Item 14.   21. The boring hole closing device according to claim 18, further comprising a water stop material filled so as to fill a gap between the injection pipe and an inner wall of the boring hole. The residual structure includes a packer and an injection pipe inserted to the hole side of the determined section in the boring hole, a closing valve installed in the hole of the boring hole, and a valve closing member. Including
The packer is configured to be integrally connected to one end of the injection pipe in the axial direction, and the closing valve is integrally connected to the other end of the injection pipe to close the opening. The valve closing member is configured to form a space filled with the consolidated material around the closing valve,
The packer is inserted into the boring hole and is configured to be installed at an arbitrary position in a state where the injection pipe is integrally connected to the packer.
The closing valve is installed so as to cover the opening of the injection pipe, and when the injection material is injected, the closing valve is opened, and the blocking valve, the injection pipe and the packer are inserted into the borehole. Injecting the injection material, configured to be closed after the injection of the injection material,
The valve closing member is disposed so as to cover the closing valve in a state where the closing valve is closed and the packer and the injection pipe remain in the bore hole. Configured to be fixed,
The boring hole closing device according to claim 14, wherein the consolidated material is filled so as to fill an internal space of the valve closing member. The packer has an outer peripheral packing that is expandable in the outer peripheral direction,
23. The packer is configured to expand the outer peripheral packing by rotation of the injection pipe in a state where the packer is inserted into the boring hole and the injection pipe is connected. A boring hole closing device according to claim 1.   The boring hole closing device according to claim 23, wherein the packer is a packer with an injection pipe to which the injection pipe for operating the outer periphery packing by rotation is integrally attached in advance.

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