JP2013241779A - Injection device and injection method for foundation injection material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily insert an inner pipe into an outer pipe, and to reliably inject a foundation injection material into the foundation.SOLUTION: A tip 2f of an outer pipe 2 is formed with an inversion member 8. A wire 9 is inverted by the inversion member 8, doubly inserted into the outer pipe 2, and exposed from a rear end opening of the outer pipe 2. The outer pipe 2 is embedded in the foundation so that the rear end opening of the outer pipe 2 can be exposed, and an engagement tool 11 disposed at one exposed portion between the exposed portions of the wire 9 is engaged with a ring 10 disposed at a tip 3f of an inner pipe 3 so that the one exposed portion can be fixed to the tip 3f of the inner pipe 3. The other exposed portion of the wire 9 is pulled so that the inner pipe 3 can be inserted from the rear end opening of the outer pipe 2 into the inside.

Description

  The present invention relates to an apparatus and method for injecting a ground injection material into the ground, and in particular, to a technique for inserting an inner pipe into an outer pipe for injection embedded in the ground.

  For the purpose of strengthening and improving the ground, there are apparatuses and methods for injecting a ground injection material into the ground. In these, as disclosed in, for example, Patent Documents 1 to 4, a double pipe composed of an outer pipe and an inner pipe is used as an injection pipe for the ground injection material.

  When there is no structure on the ground to be constructed, as in Patent Document 1, after forming a drilling hole vertically in the ground, an outer pipe is inserted into the drilling hole, and the outer pipe is embedded in the ground To do. Next, after inserting the inner pipe into the outer pipe from the rear end opening of the outer pipe exposed to the ground, the ground injection material is supplied into the inner pipe from the rear end opening of the inner pipe exposed to the ground. Then, the ground injection material is injected from the inner pipe into the ground through the discharge port provided in the inner pipe and the injection port provided in the outer pipe.

  On the other hand, when there is an existing structure on the ground to be constructed, as in Patent Documents 2 and 3, after excavating the ground diagonally or curvedly from the ground surface around the existing structure to the target depth, Excavate the ground below the structure horizontally. The outer pipe is inserted into the excavation hole formed in this manner, and the outer pipe is buried in the ground, and then the inner pipe is inserted into the inside from the rear end opening of the outer pipe. Then, the ground injection material is supplied into the inner pipe from the rear end opening of the inner pipe, and the ground injection material is injected into the ground as described above.

  Conventionally, the inner tube is inserted into the outer tube by sequentially pushing the exposed portion of the inner tube into the outer tube. For this reason, when the outer pipe is buried vertically in the ground, gravity acts in the insertion direction when the inner pipe is inserted, so that the inner pipe can be easily inserted into the outer pipe. However, if the outer pipe is bent and buried sideways in the ground, the inner pipe can be easily held in the outer pipe when inserting the inner pipe, and gravity does not act in the insertion direction. It becomes difficult to do.

  On the other hand, in patent document 4, the excavation hole which passes the downward direction of an existing structure is formed toward the other side from the one side of the ground surface on both sides of the existing structure. Moreover, the wire rope is inserted into the outer tube, and the tip of the wire rope is connected to the tip closing plate of the outer tube. Then, after penetrating the outer pipe into the excavation hole and embedding the outer pipe, remove the tip closing plate, connect the tip of the wire rope to the tip of the inner pipe, rewind the wire rope with a winch, Insert the tube into the outer tube.

  However, even if there is a work space on one side of the ground surface sandwiching the existing structure due to the adjoining existing structure, etc., there may be no work space on the other side. There is a risk of not. Further, when the target ground below the existing structure is wide in the horizontal direction, as in Patent Documents 2 and 3, even if excavation from the ground surface around the existing structure to the target ground below is possible, As described above, it is very difficult to excavate to the ground surface on the opposite side across the existing structure, and there is a possibility that the construction cannot be performed.

Japanese Patent Laying-Open No. 2005-90009 JP 2011-132671 A JP 2005-273441 A Japanese Patent Laid-Open No. 2000-27172

  The subject of this invention is inserting an inner pipe | tube easily in an outer pipe | tube, and inject | pouring a ground injection material in a ground reliably.

  The ground injection material injection device according to the present invention is provided with an outer pipe embedded in the ground and a discharge port so that the rear end opening is exposed, and the rear end opening is exposed. And an inner pipe inserted into the outer pipe, and an injection device for injecting the ground injection material supplied from the rear end opening of the inner pipe into the ground through the discharge port and the injection port. In addition, a reversing means provided at the tip of the outer tube, a wire that is reversed by the reversing means, is double inserted into the outer tube, and is exposed from the rear end opening of the outer tube, and a wire Fixing means for fixing one of the overlapping portions to the tip of the inner tube.

  Thus, after the outer tube is embedded in the ground so that the rear end opening is exposed, one of the double exposed portions of the wire exposed from the rear end opening is used as the tip of the inner tube. The inner tube can be pulled into the interior from the rear end opening of the outer tube by fixing the other exposed portion and pulling the other exposed portion. That is, the inner tube can be inserted into the inside from the rear end opening of the outer tube by the principle of the pulley. For this reason, even if the target ground is below the existing structure, it is not necessary to excavate from one side to the other side of the ground surface sandwiching the existing structure. By excavating from the ground surface around the existing structure to the lower ground and burying the outer pipe, the inner pipe can be easily inserted into the outer pipe, and the ground injection material can be reliably injected into the ground it can.

  Further, in the present invention, in the above ground injection material injection device, when the pulling force to the reversing means side is not applied to the portion from the wire fixing means to the reversing means, the double portion of the wire by the fixing means is You may make it cancel fixation of one side and the front-end | tip part of an inner tube | pipe.

  Thereby, after inserting an inner pipe | tube in an outer pipe | tube, a wire can be collect | recovered from the inside of an outer pipe | tube.

  Further, in the present invention, in the above-mentioned ground injection material injection device, a pulling force acts on the part from the wire fixing means to the reversing means, and the wire material fixing means passes through the reversing means. Instead, when a force that pulls outside the outer tube is acting on the portion that goes outside the outer tube, one of the double portions of the wire and the tip of the inner tube may be fixed by the fixing means. .

  Thereby, by pulling or sending one exposed portion and the other exposed portion of the wire alternately, the inner tube can be reciprocated in the tube axis direction in the outer tube, and can be arranged at a desired position. . Moreover, after inject | pouring a ground injection material, an inner pipe | tube can be easily collect | recovered from the inside of an outer pipe | tube by pulling one exposed part, sending it in an outer pipe | tube, stretching the other exposed part of a wire. Furthermore, by loosening or releasing the wire and releasing the wire rod from the tip of the inner tube, the wire can be recovered from the outer tube by pulling any exposed portion of the wire. .

  According to the present invention, in the ground injection material injection device, the reversing means includes a first reversing means and a second reversing means provided at the distal end portion of the outer tube, and the third reversing portion is disposed at the distal end portion of the inner tube. Means are further provided, and the wire rod is inverted one after another in the order of the first inversion means, the third inversion means, and the second inversion means, and then inserted into the outer pipe in a double manner, and the rear end opening of the outer pipe You may make it expose from.

  Thereby, in order to insert an inner pipe | tube in an outer pipe | tube by the principle of the compound pulley which combined the fixed pulley and the dynamic pulley, the force which pulls a wire can be reduced.

  Next, according to the ground injection material injection method according to the present invention, the outer tube provided with the injection port is embedded in the ground so that the rear end opening is exposed, and the discharge port is provided. After the inner pipe is inserted into the outer pipe so that the rear end opening of the inner pipe is exposed, the ground injection material is supplied to the inside from the rear end opening of the inner pipe, and the ground is passed through the discharge port and the injection port. This is an injection method that injects the ground injection material into the outer pipe, and a reversing means is provided at the tip of the outer pipe, the wire is reversed by the reversing means, and is inserted twice into the outer pipe, and the rear end opening of the outer pipe The inner tube is inserted into the outer tube by being exposed from the portion, fixing one exposed portion of the wire to the tip of the inner tube by a fixing means, and pulling the other exposed portion of the wire.

  As a result, even if the target ground is below the existing structure, there is no need to excavate from one side of the ground surface across the existing structure to the other side, from the ground surface around the existing structure to the lower ground It is possible to excavate, embed the outer pipe, easily insert the inner pipe into the outer pipe, and reliably inject the ground injection material into the ground.

  Further, in the present invention, in the above-mentioned ground injection material injection method, by alternately pulling or sending one exposed portion and the other exposed portion of the wire, the inner tube is reciprocated in the tube axis direction, Packers provided on both sides of the discharge port positioned in the vicinity of any of a plurality of injection ports provided at predetermined intervals in the tube axis direction of the outer tube and sandwiching the discharge port with respect to the tube axis direction of the inner tube May be expanded to fix the inner pipe in the outer pipe, and then the ground injection material may be supplied into the inner pipe.

  Thereby, the inner tube is moved in the tube axis direction in the outer tube, and the discharge port can be reliably positioned in the vicinity of each injection port. In addition, each time the packer is expanded and the inside of the outer pipe is divided, and then the ground injection material is supplied into the inner pipe, the ground injection material can be widely injected into the ground from each inlet.

  Further, according to the present invention, in the above-described ground injection material injection method, after the inner pipe is inserted to a predetermined position in the outer pipe, the fixing of the wire and the distal end portion of the inner pipe by the fixing means is released, and the wire is removed. You may make it collect | recover from the inside of a pipe | tube.

  Thereby, a wire can be used repeatedly. Further, when the packer is expanded to separate the inside of the outer tube, since no wire is interposed between the packer and the outer tube, it is possible to prevent the waterproof performance of the packer from being deteriorated.

  According to the present invention, the inner pipe can be easily inserted into the outer pipe, and the ground injection material can be reliably injected into the ground.

It is a principal part enlarged view of the injection apparatus of the ground injection material by 1st Embodiment of this invention. It is explanatory drawing of the injection construction method of the ground injection material by embodiment of this invention. It is explanatory drawing of the injection construction method of the ground injection material by embodiment of this invention. It is explanatory drawing of the injection construction method of the ground injection material by embodiment of this invention. It is explanatory drawing of the injection construction method of the ground injection material by embodiment of this invention. It is explanatory drawing of the injection construction method of the ground injection material by embodiment of this invention. It is a use state figure of the injection apparatus of the ground injection material of FIG. It is an injection | pouring state figure of the injection apparatus of the ground injection material of FIG. It is explanatory drawing of the injection construction method of the ground injection material by embodiment of this invention. It is explanatory drawing of the injection construction method of the ground injection material by embodiment of this invention. It is explanatory drawing of the injection construction method of the ground injection material by embodiment of this invention. It is a principal part enlarged view of the injection apparatus of the ground injection material by 2nd Embodiment of this invention. It is the figure which showed the other example of the fixing means.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

  First, the structure of the ground injection material injection device 1 according to the first embodiment will be described with reference to FIGS. 1, 3, 4, 6, 7, and 8. In FIG. 1, an enlarged view of a portion B in FIG. 1A is shown in FIG. 1B, and a cross-sectional view taken along the line C-C in FIG. The same applies to FIG.

  As shown in FIG. 1 and the like, the ground injection material injection device 1 has a double tube structure of an outer tube 2 and an inner tube 3.

  The outer tube 2 is made of a synthetic resin such as vinyl chloride or ABS and is formed in a cylindrical shape. By connecting a plurality of outer tubes 2 in the tube axis direction, the outer tube 2 can be assembled to a desired length. The connection between the outer tubes 2 is performed by means such as screwing, an adhesive, or a joint tube.

  A plurality of injection ports 2a are perforated on the peripheral surface of the outer tube 2, and a cylindrical sleeve 4 is attached so as to cover the injection ports 2a. The sleeve 4 is made of an elastic body such as rubber and is in elastic contact with the outer peripheral surface of the outer tube 2. The sleeve 4 functions as a check valve.

  As shown in FIG. 3, a plurality of injection ports 2 a and sleeves 4 are provided at predetermined intervals in the tube axis direction of the outer tube 2. The outer tube 2 is embedded in the ground G from the front end so that the rear end opening 2b is exposed from the ground surface Ga.

  The tip of the outer tube 2 is closed with a cap 5 as shown in FIG. The cap 5 is fitted to the distal end portion 2f of the outer tube 2 and joined by screwing or an adhesive.

  The inner tube 3 is made of a flexible material. The outer diameter of the inner tube 3 is smaller than the inner diameter of the outer tube 2. The distal end portion 3f of the inner tube 3 is closed. A plurality of discharge ports 3a are perforated at a predetermined interval from the distal end portion 3f of the inner tube 3 in the tube axis direction.

  As shown in FIG. 6 and the like, the inner tube 3 is inserted into the outer tube 2 from the front end portion 3f so that the rear end opening 3b is exposed from the ground surface Ga. In order to make it difficult to catch the inner tube 3 in the outer tube 2, as shown in FIG. 1 and the like, there is no step on the inner peripheral surface of the outer tube 2, and the corner of the tip 3f of the inner tube 3 is rounded.

  As shown in FIG. 7 and the like, packers 6 are provided on both sides of the discharge port 3 a with respect to the tube axis direction of the inner tube 3. A hose 7 communicating with each packer 6 is provided in the inner tube 3. The base end (the side opposite to the packer 6) of the hose 7 is exposed from the ground surface Ga.

  The ground injection material is supplied to the inside from the rear end opening 3b (FIG. 6 and the like) of the inner tube 3 and discharged from the discharge port 3a. A fluid such as air or gas is supplied into the packer 6 or sucked from the packer 6 through the hose 7. As a result, the packer 6 expands as shown in FIG. 8 or the like, or contracts as shown in FIG. 7 or the like.

  As shown in FIG. 1, a reversing member 8 is provided inside the cap 5 at the distal end portion 2 f of the outer tube 2. The reversing member 8 includes a cylindrical portion 8a and a base portion 8b. The column portion 8a may or may not rotate with respect to the base portion 8b.

  An extremely thin wire 9 is hung on the cylindrical portion 8 a of the reversing member 8. The wire 9 is made of, for example, a wire rope, a piano wire, a teg, or a fishing line. The length of the wire 9 is longer than three times the length of the outer tube 2. The strength of the wire 9 is at least strong enough to lift the inner tube 3.

  As shown in FIGS. 1 and 4, the wire 9 is reversed (folded back) by the reversing member 8, is double inserted into the outer tube 2, and is exposed from the rear end opening 2 b of the outer tube 2. . The reversing member 8 is an example of the “reversing means” in the present invention.

  As shown in FIG. 1, a ring 10 is attached to the distal end portion 3 f of the inner tube 3. The tip 3f of the inner tube 3 and the ring 10 are made of metal. One of the double portions of the wire 9 penetrates the inside of the ring 10. In addition, a spherical engagement tool 11 is attached to one of the double portions of the wire 9. The engagement tool 11 is made of metal and can be attached to and detached from any position of the wire 9.

  The outer diameter of the engaging tool 11 is larger than the inner diameter of the ring 10, so that the engaging tool 11 cannot pass through the ring 10. For this reason, when the engaging tool 11 is engaged with the ring 10 and a force pulling toward the reversing member 8 is acting on the portion 9a of the wire 9 from the engaging tool 11 to the reversing member 8, the double of the wire 9 is applied. One of the portions is fixed to the distal end portion 3 f of the inner tube 3.

  Further, when a force pulling toward the reversing member 8 is not applied to the portion 9 a from the engaging member 11 of the wire 9 to the reversing member 8, one of the double portions of the wire 9 and the tip 3 f of the inner tube 3 Fixing is released. The ring 10 and the hook 11 are examples of the “fixing means” in the present invention.

  Next, a method for injecting a ground injection material using the above-described injection device 1 will be described with reference to FIGS.

  In this example, for example, as shown in FIG. 2, for the purpose of strengthening the ground G below the existing structure K, a ground injection material made of a chemical solution for improving the ground is introduced into the ground G by the injection device 1. inject.

  First, the range, depth, interval, pressure, injection amount, and the like for injecting the ground injection material are set in accordance with the state of the ground G to be constructed, such as softness and soil quality. Next, as shown in FIG. 2, the ground G is excavated diagonally or curvedly from the ground surface Ga around the existing structure K to the set depth, and further, the ground G below the existing structure K is set within a set range. Drill horizontally until.

  Then, as shown in FIG. 3, the outer tube 2 is inserted into the formed excavation hole H, and the outer tube 2 is embedded in the ground G. At this time, the rear end opening 2b of the outer tube 2 is exposed from the ground surface Ga. Further, a gap between the excavation hole H and the outer tube 3 is filled with a seal grout or the like.

  Next, as shown in FIG. 4, of the double exposed portions 9b and 9c of the wire rod 9 exposed from the rear end opening 2b of the outer tube 2, one exposed portion 9b is placed inside the ring 10 (FIG. 1). And the hook 11 (FIG. 1) is attached to the packer 6 side of the ring 10 of the exposed portion 9b. Then, from the state of FIG. 4, the distal end portion 3 f of the inner tube 3 is inserted into the rear end opening 2 b of the outer tube 2, and the other exposed portion 9 c of the wire 9 is pulled to the opposite side to the outer tube 2.

  As a result, a tensile force acts on the wire 9, the engaging tool 11 engages with the ring 10, and one exposed portion 9 b of the wire 9 is fixed to the distal end portion 3 f of the inner tube 3. Then, with this fixed portion as a fulcrum, the inner tube 3 is drawn into the outer tube 2 as shown in FIG. That is, by the operation on the ground (outside the outer tube 2), the inner tube 3 is inserted into the outer tube 2 with the distal end portion 3 f being pulled by the wire 9.

  At that time, the inner tube 3 advances in the outer tube 2 while being bent along the inner surface of the outer tube 2. The wire 9 may be pulled manually or using a machine such as a winch.

  When the other exposed portion 9c of the wire 9 is pulled to a predetermined length, the inner tube 3 is inserted to a predetermined position (innermost back) in the outer tube 2 as shown in FIG. At this time, the discharge port 3a of the inner tube 3 is positioned in the vicinity of the innermost injection port 2a and the sleeve 4 of the outer tube 2 (see FIG. 7).

  Next, the other exposed portion 9c of the wire 9 is released. Then, the pulling force toward the reversing member 8 does not act on the portion 9a extending from the fixing portion (the engaging portion of the ring 10 and the engaging tool 11) between the wire 9 and the tip 3f of the inner tube 3 to the reversing member 8. The fixing between the wire 9 and the tip 3f of the inner tube 3 is released.

  Then, one exposed portion 9 b of the wire 9 is pulled to the opposite side to the outer tube 2. Then, as shown in FIG. 7, the wire 9 moves in the tube axis direction so that the engaging tool 11 moves away from the ring 10 while leaving the inner tube 3 at a predetermined position of the outer tube 2. In this way, the wire 9 is all pulled out from the outer tube 2 and collected on the ground.

  Next, the rear end of the inner pipe 3 is connected to the ground injection material supply device 20 installed on the ground shown in FIG. Further, the rear end of the hose 7 is connected to the fluid supply device 30 installed on the ground.

  And a fluid is supplied in the packer 6 from the fluid supply apparatus 30 through the hose 7, and the packer 6 is expanded as shown in FIG. Then, the inner pipe 3 is fixed, the inside of the outer pipe 2 is partitioned, and a closed space 12 is formed in the vicinity of the discharge port 3 a of the inner pipe 3.

  Next, the ground injection material is supplied to the inside from the rear end opening 3b of the inner pipe 3 by the ground injection material supply device 20 (FIG. 9). Then, as shown by arrows in FIG. 8, the ground injection material is discharged from the discharge port 3 a of the inner tube 3 to the closed space 12 in the outer tube 2.

  When the closed space 12 is filled with the ground injection material, the ground injection material spreads the sleeve 4 from the injection port 2a of the outer tube 2 (in the state of a two-dot chain line), and the outer periphery of the sleeve 4 and the outer tube 2 It passes through the gap between the surfaces and is ejected from the end of the sleeve 4. At this time, the ground injection material collides with the step 2 d of the outer pipe 2, scatters in the pipe radial direction, and is injected into the ground G. The ground injection material injected into the ground G penetrates into the ground G as indicated by hatching M in FIG.

  When a predetermined amount of ground injection material is injected, the supply of ground injection material from the ground injection material supply device 20 is stopped, and then the fluid in the packer 6 is sucked through the hose 7 by the fluid supply device 30 to remove the packer 6. Shrink. Then, the exposed portion 3 c of the inner tube 3 from the ground surface Ga is pulled to move the inner tube 3 to the ground side by a predetermined amount, and the discharge port 3 a is positioned in the vicinity of the next inlet 2 a of the outer tube 2.

  When the inner tube 3 is positioned, the packer 6 is expanded as described above to partition the outer tube 2, and then the ground injection material is supplied into the inner tube 3. Then, as shown by hatching in FIG. 10, the ground injection material is injected into the ground G from a position at a predetermined interval from the previous injection position.

  Thereafter, as described above, the inner tube 3 is moved in the tube axis direction in the outer tube 2, the discharge port 3a is positioned in the vicinity of each injection port 2a, and the ground injection material is passed through each injection port 2a. It is injected extensively into the ground G. When the injected ground injection material is hardened, the ground G below the existing structure K is reinforced as indicated by hatching M ′ in FIG. 11. The inner tube 3 is extracted from the outer tube 2 and collected on the ground.

  According to the above, after the outer tube 2 is embedded in the ground G so that the rear end opening 2b is exposed, one of the double exposed portions 9b and 9c of the wire rod 9 exposed from the rear end opening 2b. The exposed portion 9b is fixed to the tip 3f of the inner tube 3. And the inner pipe | tube 3 can be drawn in from the rear-end opening part 2b of the outer pipe | tube 2 by pulling the other exposed part 9c. That is, the inner tube 3 can be easily inserted into the inside from the rear end opening 2b of the outer tube 2 by the principle of the pulley.

  For this reason, even if the target ground G is below the existing structure K, it is not necessary to excavate from one side of the ground surface Ga across the existing structure K to the other side. By excavating from the ground surface Ga around the existing structure K to the lower ground G and burying the outer tube 2, the inner tube 3 can be easily inserted into the outer tube 2 and injected into the ground G. The material can be reliably injected.

  Further, when the other exposed portion 9c of the wire 9 is released, the pulling force toward the reversing member 8 does not act on the portion 9a extending from the fixing portion of the wire 9 to the reversing member 8, and the wire 9 and the distal end portion of the inner tube 3 The fixation with 3f is released. For this reason, after inserting the inner tube 3 into the outer tube 2, the other exposed portion 9 c of the wire 9 is released and the one exposed portion 9 b is pulled to recover the wire 9 from within the outer tube 2. Can do.

  Furthermore, the wire 9 can be repeatedly used by collecting the wire 9 from the outer tube 2. Further, when the packer 6 provided in the inner tube 3 is expanded and the inside of the outer tube 2 is partitioned, no wire 9 is interposed between the packer 6 and the outer tube 2, so that the water-stopping performance of the packer 6 is improved. It is possible to prevent the decrease.

  Next, the structure of the ground injection material injection device 1 according to the second embodiment will be described with reference to FIG.

  As shown in FIG. 12, two reversing members 13 and 14 are provided inside the cap 5 at the distal end portion 2 f of the outer tube 2. The tip portion 3 f of the inner tube 3 is provided with one reversing member 15 and a winding protrusion 16.

  The wire 9 is hung on each cylindrical part 13a, 15a, 14a in the order of the reversing member 13, the reversing member 15, and the reversing member 14. That is, the wire 9 is reversed one after another in the order of the reversing member 13, the reversing member 15, and the reversing member 14. The wire 9 is inserted into the outer tube 2 in a double manner and exposed from the rear end opening 2b of the outer tube 2 in the same manner as in FIG. The reversing member 13 is an example of the “first reversing means” in the present invention. The reversing member 14 is an example of the “second reversing means” in the present invention. The reversing member 15 is an example of the “third reversing means” in the present invention.

  One of the double portions of the wire 9 is wound around the winding protrusion 16, for example, several times. A force pulling toward the reversing member 13 acts on the portion 9a from the winding projection 16 of the wire 9 to the reversing member 13, and the outer tube 2 does not pass from the winding projection 16 of the wire 9 via the reversing means 13-15. One of the double portions of the wire 9 is fixed to the distal end portion 3 f of the inner tube 3 when a force pulling outside the outer tube 2 is acting on the portion 9 d that extends to the outside.

  Further, when the pulling force to the reversing member 13 side is not applied to the portion 9a of the wire 9, or when the pulling force to the outside of the outer tube 2 is not applied to the portion 9d, the wire 9 is wound around the winding protrusion 16 The force is loosened, and the fixation of one of the double portions of the wire 9 and the distal end portion 3f of the inner tube 3 is released. The winding protrusion 16 is an example of the “fixing means” in the present invention.

  In the case of performing the injection method using the ground injection material injection device 1 as described above, for example, as shown in FIG. 3, after the outer pipe 2 is embedded in the ground G, the rear end opening 2b of the outer pipe 2 is embedded. One exposed portion 9b of the wire rod 9 exposed from is wound around the winding protrusion 16.

  And the front-end | tip part 3f of the inner tube | pipe 3 is inserted in the rear-end opening part 2b of the outer tube | pipe 2, and while the one exposed part 9b of the wire rod 9 is stretched, it sends in the outer pipe | tube 2 and pulls the other exposed part 9c. . Then, the inner tube 3 is drawn into the inside from the rear end opening 2b of the outer tube 2.

  In this way, after inserting the inner tube 3 into the outer tube 2, the inner tube 3 is pulled by pulling the other exposed portion 9c while feeding the other exposed portion 9b of the wire 9 into the outer tube 2 while stretching it. The outer tube 2 moves to the tip 2f side. Further, when the one exposed portion 9b is pulled while being fed into the outer tube 2 while stretching the other exposed portion 9c of the wire rod 9, the inner tube 3 moves to the rear end opening 2b side of the outer tube 2.

  As a result, the one exposed portion 9b and the other exposed portion 9c of the wire 9 are alternately pulled or sent, whereby the inner tube 3 is reciprocated in the tube axis direction within the outer tube 2, and the discharge port 3a Is positioned in the vicinity of one of the inlets 2a. Then, as described above, after the packer 6 is expanded and the inner tube 3 is fixed in the outer tube 2, the ground injection material is supplied into the inner tube 3, and the ground injection material is supplied to the ground through each inlet 2a. Inject extensively into G.

  At the time of this injection, the wire 9 remains in the outer tube 2, but the diameter of the wire 9 is extremely fine, so even if the wire 9 is sandwiched between the packer 6 and the inner surface of the outer tube 2, the packer 6 is suppressed to a minimum. The wire 9 can be used repeatedly if the inner tube 3 is pulled out from the outer tube 2 and then pulled out from the outer tube 2 and collected on the ground.

  As another example, after the inner tube 3 is inserted to the innermost depth of the outer tube 2, at least one of the exposed portions 9 b and 9 c of the wire 9 is loosened or released, so that the wire 9 and the inner tube 3 are released. The tip 3f is released from the fixed state. Then, one of the exposed portions 9b and 9c of the wire 9 may be released, and the other may be pulled to pull the wire 9 from the outer tube 2 and collect it on the ground. In this case, the wire can be used repeatedly, and the deterioration of the water stop performance of the packer 6 can be prevented.

  According to the above, the inner tube 3 can be easily inserted into the inside from the rear end opening 2b of the outer tube 2. Moreover, the force of pulling the wire 9 can be reduced in order to insert the inner tube 3 into the outer tube 2 by the principle of a double pulley combining a fixed pulley and a moving pulley. Specifically, as compared with the first embodiment in which only one reversing portion 8 is provided, in the second embodiment in which three reversing portions 13 to 15 are provided, the force for pulling the wire 9 in order to insert the inner tube 3. Can be reduced to 1/3.

  Also, by pulling or sending one exposed portion 9b and the other exposed portion 9c of the wire rod 9 alternately, the inner tube 3 is reciprocated in the tube axis direction within the outer tube 2 to a desired position. Can be arranged. For this reason, the discharge port 3a of the inner tube 3 can be reliably positioned in the vicinity of each injection port 2a of the outer tube 2. Further, each time the packer 6 is inflated to divide the inside of the outer pipe 2, and then the ground injection material is supplied into the inner pipe 3, the ground injection material can be spread widely into the ground G from each injection port 2a. Can be injected.

  Further, after the injection of the ground injection material, the inner tube 3 can be easily recovered from the outer tube 2 by pulling the one exposed portion 9b while feeding the other exposed portion 9c of the wire 9 into the outer tube 2 while stretching it. can do.

  Further, by loosening or releasing the wire 9 and releasing the fixing of the wire 9 to the tip 3f of the inner tube 3, the wire 9 can be pulled out of the outer tube 2 and collected. .

  The present invention can employ various embodiments other than those described above. For example, in the above-described embodiment, an example in which the wire 9 in the outer tube 2 and the distal end portion 3f of the inner tube 3 can be released by an operation outside the outer tube 2 has been described. It is not limited to. In addition to this, for example, as shown in FIG. 13, the wire 9 is fixed to the distal end portion 3 f of the inner tube 3 with a fastener 17 such as a bolt and a nut and inserted into the outer tube 2, and then the outer tube 2. The fixing may not be released from the outside. Further, as the fixing means, in addition to the ring 10, the engaging tool 11, the winding protrusion 16, and the fastener 17, rivets, welding, and the like may be used.

  Moreover, in the said 1st Embodiment, after inserting the inner pipe | tube 3 in the outer pipe | tube 2, before supplying a ground injection material in the inner pipe | tube 3, the example which collect | recovered the wire 9 from the outer pipe | tube 2 is shown. However, the present invention is not limited to this, and the wire 9 may be left in the outer tube 2 without being recovered. In this case, by pulling the other exposed portion 9c of the wire rod 9, the inner tube 3 is moved to the distal end 2f side of the outer tube 2, and by pulling the exposed portion 3c of the inner tube 3, the inner tube 3 is connected to the outer tube. 2 can be moved toward the rear end opening 2b. And it becomes possible to arrange | position the inner tube | pipe 3 in the desired position in the outer tube | pipe 2. FIG.

  Moreover, although the example which used the inner tube | pipe 3 provided with the packer 6 one each on the both sides of the discharge outlet 3a was shown in the said embodiment, this invention is not limited to this. In addition to this, for example, an inner tube provided with a plurality of discharge ports at a predetermined interval in the tube axis direction, an inner tube provided with three or more packers, an inner tube without a packer, or the like may be used. Moreover, you may use the outer tube | pipe by which the packer was provided in the internal or outer peripheral surface as an outer tube | pipe.

  Moreover, although the example which provided the three inversion members 13, 14, and 15 was shown in the said 2nd Embodiment, this invention is not restricted to this, Three or more inversion is carried out at the front-end | tip part 2f of the outer tube | pipe 2. Means may be provided, or two or more inversion means may be provided at the distal end portion 3 f of the inner tube 3.

  Moreover, in the said embodiment, although the example which inserted the inner pipe | tube 3 in the outer pipe | tube 2 embed | buried in the ground G so that it might bend in the horizontal direction from diagonally downward was shown, this invention is not limited to this. Absent. Other than this, for example, in an outer pipe embedded in the ground so as to extend straight in the vertical direction, upward direction, diagonal direction, or horizontal direction, or embedded in the ground so as to bend from one of them to the other According to the present invention, the inner tube can be easily inserted into the outer tube.

  Furthermore, in the above-described embodiment, for the purpose of strengthening the ground, an example in which the present invention is applied to inject the ground injecting material composed of a chemical solution for ground improvement into the ground is shown, but for other purposes, The present invention can also be applied to inject other ground injection materials into the ground.

DESCRIPTION OF SYMBOLS 1 Ground injection material injection apparatus 2 Outer pipe 2a Inlet 2b Rear end opening of outer pipe 2f End of outer pipe 3 Inner pipe 3a Discharge port 3b Rear end opening of inner pipe 3f End of inner pipe 6 Packer 8 , 13, 14, 15 Reversing member 9 Wire 9a Portion from wire fixing means to reversing means 9b One exposed portion of wire 9c The other exposed portion of wire 9d Outside the wire fixing means without passing through the reversing means 10 Ring 11 Engagement tool 16 Winding protrusion G Ground

Claims (7)

An outer pipe embedded in the ground so that an inlet is provided and the rear end opening is exposed;
An inner pipe inserted into the outer pipe so that a discharge port is provided and the rear end opening is exposed,
In the ground injection material injection device for injecting the ground injection material supplied from the rear end opening of the inner pipe into the ground through the discharge port and the injection port,
Reversing means provided at the tip of the outer tube;
Inverted by the reversing means, double inserted in the outer tube, and exposed from the rear end opening of the outer tube,
An injection device for ground injection material, comprising: a fixing means for fixing one of the double portions of the wire to the tip of the inner tube. In the ground injection material injection device according to claim 1,
When the pulling force to the reversing means side is not acting on the part from the fixing means to the reversing means of the wire,
The ground injection material injection device, wherein the fixing means releases one of the double portions of the wire and the tip of the inner tube. The ground injection material injection device according to claim 1 or 2,
A force pulling toward the reversing means acts on a portion of the wire extending from the fixing means to the reversing means, and from the fixing means of the wire to the outside of the outer pipe without passing through the reversing means. When a force pulling outside the outer tube is acting on the part,
One of the double parts of the said wire and the front-end | tip part of the said inner pipe are fixed by the said fixing means, The injection apparatus of the ground injection material characterized by the above-mentioned. In the ground injection material injection device according to any one of claims 1 to 3,
The reversing means comprises a first reversing means and a second reversing means provided at the tip of the outer tube,
A third inversion means is further provided at the tip of the inner tube;
The wire rod is reversed one after another in the order of the first reversing means, the third reversing means, and the second reversing means, and then inserted into the outer tube in a double manner, thereby opening the rear end of the outer tube. An injection device for ground injection material, which is exposed from a portion. The outer pipe provided with the inlet is buried in the ground so that the rear end opening is exposed,
After inserting the inner pipe provided with the discharge port into the outer pipe so that the rear end opening of the inner pipe is exposed,
In the ground injection material injection method of supplying the ground injection material into the ground through the discharge port and the injection port, supplying the ground injection material from the rear end opening of the inner pipe to the inside,
Inversion means is provided at the tip of the outer tube,
Reversing the wire with the reversing means, double inserted in the outer tube, exposed from the rear end opening of the outer tube,
Fixing one exposed portion of the wire to the tip of the inner tube by a fixing means;
A ground injection material injection method, wherein the inner pipe is inserted into the outer pipe by pulling the other exposed portion of the wire. In the ground injection material injection method according to claim 5,
By pulling or feeding one exposed portion and the other exposed portion of the wire alternately, the inner tube is reciprocated in the tube axis direction, and is provided at a predetermined interval in the tube axis direction of the outer tube. In the vicinity of any one of the plurality of injection ports, the discharge port is located,
After inflating packers provided on both sides of the discharge port with respect to the tube axis direction of the inner tube, and fixing the inner tube in the outer tube,
A ground injection material injection method, wherein a ground injection material is supplied into the inner pipe. In the ground injection material injection method according to claim 5 or 6,
After inserting the inner tube to a predetermined position in the outer tube,
An injection method for ground injection material, wherein the fixing of the wire and the tip of the inner pipe by the fixing means is released and the wire is recovered from the outer pipe.

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