JP2004232204A - Injector of ground improving material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injector surely locked on a prescribed position. <P>SOLUTION: This injector 10 is inserted inside an outer tube 12 buried in the ground, and is used for injecting an injection material. The injector 10 has an injector body 14 arranged in the outer tube 12 and a lock mechanism 16 connected to the rear of a body 14. The body 14 has an injection inner tube 18 arranged on the axis, opening an injection material delivery port on the tip and supplying the injection material from an upper part and an independent packer 20 brought into close contact with an inside surface of the outer tube 12 by diametrally expanding by injection of fluid and separating from the inside surface of the outer tube 12 by removal of the fluid. The lock mechanism 16 is put in either state of a lock state of regulating the shaft directional movement of the injector body 14 by being brought into pressure contact with the inside surface of the outer tube 12 when injecting the injection material and an unlocking state of allowing the shaft directional movement of the injector body 14 by separating from the inside surface of the outer tube 12 when inserting and extracting the injector 10. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an injection device for injecting a chemical such as a curing agent into the ground, and more particularly to an injection device for an injection material used for ground improvement.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a chemical liquid injection device and a construction method for ground improvement, a double packer device and a construction method using the same are known (for example, see Patent Document 1, Patent Document 2, and Patent Document 3).
In the injection method using this double packer device, the ground is drilled to a predetermined depth while inserting the casing, an outer pipe is built in the casing, and after filling the seal material, the injection inner pipe with the double packer attached to the tip is removed. It is inserted into the outer tube, a closed space is created by expansion of the upper and lower packers, and an injection material for soil improvement is discharged into the ground through an injection hole provided between the packers through the closed space.
When the injection material for soil improvement is injected in this way, the injection material can be injected into the predetermined ground without overflowing to the ground along the outer pipe, and in particular, in the case of a composite ground, the reliability of the soil improvement effect is certain. Is a high construction method.
However, such a conventional double packer apparatus and a construction method have the technical problems described below.
[0003]
[Patent Document 1]
Japanese Patent No. 3182545
[0004]
[Patent Document 2]
JP-A-8-226119
[0005]
[Patent Document 3]
JP-A-7-90830
[0006]
[Problems to be solved by the invention]
That is, since the double packer device has a pair of packers separated by a predetermined interval, the total length is long, and there is a problem in that the double packer device cannot be inserted when a hole is bent.
[0007]
In addition, when using a quick-setting (short gel time) injection material or an injection material having a high homogel strength, if an injection material of such properties is injected from the space closed between the packers, it will be early. The injection material hardens, and the packer and the surroundings of the packer are fixed to the outer tube by the injection material, which makes it difficult to shrink the packer, and there is a problem that even if this is shrunk, it is not possible to step up to the upper side. However, such a filling material cannot be applied to a conventional double packer device.
[0008]
In order to solve such a problem, for example, an injection device configured with a single packer can be considered instead of the double packer. However, the injection device having such a configuration has another technical feature described below. Challenges.
[0009]
In other words, in the case of the double packer device, when the injection material is discharged into the closed space, pressures in different directions are applied to the upper and lower packers. The position could be fixed.
[0010]
However, when changing the configuration from double to single, the injection pressure of the injection material causes the single packer to have a thrust to push it upward, and only the frictional force between the outer tube and the packer causes It becomes difficult to fix the entire device at a predetermined position, and a problem occurs that the entire device moves upward.
[0011]
In this case, in particular, when using a high-strength, quick-setting injection material having a short gel time, it is necessary to perform injection at a higher pressure. Affects the reliable injection of the injection material.
[0012]
The present invention has been made in view of such a problem, and its object is to easily insert and withdraw into the ground, and to be applicable to a high-strength, quick-setting injection agent. Another object of the present invention is to provide a device for injecting a ground improvement material that is securely locked at a predetermined position.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an injection device which is inserted into an outer pipe buried in the ground, or a drilled hole formed in the ground, and discharges a ground improvement injection material toward the ground. The injection device includes an apparatus main body installed in the outer tube, and a lock mechanism connected to the rear of the apparatus main body, the apparatus main body is provided on a central axis, and an injection material discharge port is provided at a tip end. And the inner pipe to which the injection material is supplied from the upper side, and the diameter is expanded by injecting a fluid, and the outer pipe or the inner pipe is bored, and the outer pipe is removed by removing the fluid. Having a single packer separated from the inner surface, wherein the lock mechanism is in contact with the inner surface of the outer tube or drilled hole during injection of the injection material to lock the injection device main body in the axial direction, And inserting the injection device; At vent, spaced from the inner surface of the outer tube, and so that in one of two states: an unlocked state to permit axial movement of said injection apparatus.
[0014]
According to the ground improvement material injection device configured as described above, the lock mechanism presses against the inner surface of the outer pipe or the drilled hole to lock the injection device body in the axial direction, and inserts the injection device. In addition, at the time of pulling out, it is separated from the outer tube or the inner surface of the drilled hole and is in one of the unlocked states that allows the axial movement of the injection device main body. Even in this case, it is possible to oppose the axial movement of the injection device main body due to the injection pressure of the injection material, whereby the injection material can be reliably discharged into the ground.
[0015]
The lock mechanism includes a holder disposed on the outer circumference of the injection inner tube and connected to the injection device body, a plurality of lock pieces, and a piston, and one end of the lock piece is swingable by the holder. , A rubber ring is mounted on the swing end side, and is contracted toward the central axis side. The piston has a tapered member that engages with the lock piece at its tip, and is infused with fluid. A lock state in which the rocking end side of the lock piece moves in the axial direction along the outer circumference of the injection inner pipe, and the rocking end side of the lock piece presses against the inner surface of the outer pipe against the elastic force of the rubber ring. Due to the elastic force of the ring, any one of an unlocked state separated from the inner surface of the outer tube can be set.
[0016]
According to this configuration, by the axial movement of the piston, the rocking end side of the lock piece is pressed against the inner surface of the outer tube against the elastic force of the rubber ring, and the outer tube is pressed by the elastic force of the rubber ring. The unlocked state is separated from the inner surface of the injection device, so that the axial movement of the injection device main body can be regulated with a simple configuration.
[0017]
The lock piece may be provided with a serrated projection at a position facing the inner surface of the outer tube.
[0018]
According to this configuration, when the serrated projection is pressed against the outer tube, the frictional force between the outer tube and the outer tube increases, so that the axial movement of the injection device main body can be more firmly restricted.
[0019]
The lock mechanism is disposed on the outer circumference of the infusion tube, and includes a holder connected to the infusion device main body, a plurality of link mechanism portions bent in a rectangular shape, and a piston, and the link mechanism portion has one end. The pin is connected to the holder by a pin, and the piston is connected to the link mechanism at the tip end, moves axially by injection of fluid, and the bent end of the link mechanism presses against the inner surface of the outer tube. And an unlocked state in which the bent end is separated from the inner surface of the outer tube.
[0020]
The drive unit for expanding and contracting the diameter of the packer can also be used as a drive unit for moving the piston in the axial direction.
[0021]
According to this configuration, the injection device can be simplified.
The lock mechanism is disposed on the outer circumference of the infusion tube, and is connected to the infusion device main body, a plurality of link mechanisms bent in a V shape, and moves the link mechanism along the axial direction. A moving mechanism, wherein both ends of the link mechanism are connected to the holder and the driving unit, and the moving mechanism is attached such that a bent end of the link mechanism is pressed against the inner surface of the outer tube. A biasing compression spring, wherein the bent end of the link mechanism is pressed against the inner surface of the outer tube when the moving mechanism moves in the axial direction, and the bent end is separated from the inner surface of the outer tube. Unlocked state.
[0022]
The moving mechanism unit is coupled to one end of a slide cylinder that moves axially along the outer peripheral surface of the injection inner tube, and operates the link mechanism unit in the axial direction by operating a wire extending above the outer tube. Can be moved along.
[0023]
The injection inner pipe has a double structure of a main material injection pipe and a hardener injection pipe, and a main material and a hardener are mixed at a tip portion of the main material injection pipe and the hardener injection pipe. it can.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a first embodiment of an apparatus for injecting a ground improvement material according to the present invention. FIG. 1 is a longitudinal sectional view, and FIG. 2 is a sectional view of a main part of FIG. .
[0025]
The injection device 10 shown in FIG. 1 is inserted into an outer pipe 12 buried in the ground E, and injects the injection material A for ground improvement. The outer pipe 12 is a hollow pipe body having both ends opened, and a discharge hole for discharging the injection material A discharged from the injection apparatus 10 to the ground as shown in FIG. 12a is drilled at an arbitrary position.
[0026]
The discharge holes 12a of the outer tube 12 may be formed at regular intervals along the longitudinal direction of the outer tube 12, or may be provided with a check valve structure for preventing backflow from outside the tube. Further, in the following embodiment, an application example in which the outer pipe 12 is buried and installed in a drilled hole formed in the ground and the injection device 10 is inserted into the outer pipe 12 is shown. The embodiment of the present invention is not limited to this mode, and the injection device 10 may be directly inserted into the hole.
[0027]
The injection device 10 includes a device main body 14 installed in the outer tube 12 and a lock mechanism 16, and the lock mechanism 16 is connected to the rear of the device main body 14. The apparatus main body 14 includes an inner injection tube 18 and a single packer 20.
[0028]
The injection inner tube 18 is a hollow cylindrical tube which is disposed on the central axis O of the outer tube 12 and has both ends opened. A discharge port 18a of the injection material A is formed at the tip end side, and the upper end side is not shown. Is supplied to the supply section of the injection material A, and the injection material A is supplied from the upper side.
[0029]
The single packer 20 is disposed on the outer peripheral side of the inner injection pipe 18 and includes a cylindrical support cylinder 20a having both ends opened, a cylindrical rubber 20b, and a rubber holder 20c.
[0030]
The support cylinder 20a is disposed on the outer periphery of the injection inner tube 18 with its lower end screwed to the injection inner tube 18 so as to separate a predetermined annular space 21 from the outer peripheral surface of the injection inner tube 18. I have.
[0031]
The cylindrical rubber 20b is expandable and contractible, and is formed in a cylindrical shape with both ends opened, and the cylindrical open end is held by a rubber holder 20c. The rubber holder 20c is fixedly provided on the outer peripheral surfaces on both ends of the support cylinder 20a with a seal ring 20d interposed therebetween, and a closed space 20e is formed on the outer periphery of the support cylinder 20a.
[0032]
The distal end side of the drive tube 20f communicates with the closed space 20e. In the single packer 20 configured as described above, when a fluid, for example, a liquid such as water or a gas such as air is injected through the drive pipe 20f, this is filled in the closed space 20e, and the cylindrical rubber 20b is expanded. The outer surface of the cylindrical rubber 20b whose diameter has been enlarged and abuts against the inner surface of the outer tube 12 and closely adheres to the inner surface.
[0033]
In such a close contact state, when a fluid is poured out and removed from the closed space 20e through the drive pipe 20f, the expanded state of the cylindrical rubber 20b contracts, and the outer surface of the cylindrical rubber 20b is It is separated from the inner surface of the tube 12.
[0034]
On the other hand, in the case of the present embodiment, the lock mechanism 16 includes a holder 160, a plurality of lock pieces 161, and a piston 162. The holder 160 is formed in a substantially truncated cone shape, is connected and fixed to the end of the support tube 20a of the packer 20 via a screw, and has a through hole 163 formed at the center.
[0035]
One end of each of the three lock pieces 161 is pin-connected to the side surface of the holder 160. As shown in FIG. 2, the three lock pieces 161 are arranged at equal angular intervals with respect to the center of the outer tube 12, and are swingably supported by the holder 160.
[0036]
The member denoted by reference numeral 19 in FIG. 2 is a fluid supply hose connected to the drive pipes 20f and 20f '. In the case of the present embodiment, one drive pipe 20f is connected to The drive unit for expanding and contracting the packer 20 is also used as a drive unit for moving the piston 162 in the axial direction, and the other drive pipe 20f 'is provided with a space 21 on the operation side of the piston 162, as shown in FIG. (Outside portion 168 in the figure).
[0037]
By supplying the fluid, the drive pipe 20f 'forcibly moves the piston 162 to the left in FIG. 2 along the axial direction of the infusion inner pipe 18, and by the urging force of the rubber ring 166, The lock piece 161 assists in the unlocked state in which the central axis contracts. The drive tube 20f 'is not always necessary if the elastic state of the rubber ring 166 is appropriately selected so that the unlocked state can be stably maintained.
[0038]
On the outer surface side of each lock piece 161, a serrated protrusion 164 is formed at a position facing the inner surface of the outer tube 12. An inclined surface 165 that is inclined downward toward the central axis O is provided on the inner surface side of each lock piece 161.
[0039]
On the other hand, a rubber ring 166 is mounted on the swing end side of each lock piece 161, whereby the three lock pieces 161 are urged to always contract toward the central axis O.
[0040]
The piston 162 includes a base 167 and an operation end 168 extending at one end of the base 167. The base 167 is installed in the annular space 21 separated by the injection inner tube 18 and the support cylinder 20a, The operation end 168 extends through the through hole 163 of the holder 160 fitted to the outer periphery of the infusion tube 18 and extends below the lock piece 161.
[0041]
A tapered member 169 having a tapered surface that engages with the inclined surface 165 of the lock piece 161 is fixed to the distal end of the operation end 168 of the piston 162.
[0042]
In the case of the present embodiment, the distal end side of the drive tube 20f of the packer 20 is also connected to the annular space 21, and the diameter expansion and contraction drive unit of the packer 20 drives the axial movement of the piston 162. Also, the injection device 10 is simplified.
[0043]
In the lock mechanism 16 configured as described above, in a steady state in which fluid is not injected into the annular space 21, as shown in the lower half of FIG. 1, the lock piece 161 swingably supported by the holder 160 has a swing end. Since the side is urged by the rubber ring 166 so as to contract toward the central axis O, it is located at a position separated from the inner surface of the outer tube 12.
[0044]
In this case, since the inclined surface 165 of the lock piece 161 and the tapered member 169 are engaged with each other, the piston 162 is moved toward the distal end of the apparatus main body 14 under the urging force of the rubber ring 166. In this case, the piston 162 may be forcibly moved by the fluid pressure. In addition, the movement range of the piston 162 at this time is regulated by the step portion 22 provided in the annular space 21.
[0045]
In such a state, since the serrated protrusion 164 of the lock piece 161 is separated from the inner surface of the outer tube 12, the operation of the injection inner tube 18 causes the device main body 14 to operate unless the diameter of the packer 20 is increased. It can be moved to any position.
[0046]
On the other hand, when the fluid is injected into the annular space 21 through the drive pipe 20f from this state, the piston 162 receives this injection pressure and moves from the position shown in the lower half of FIG. Move to the right as shown in.
[0047]
When the piston 162 moves rightward along the axial direction, the tapered member 169 that engages with the inclined surface 165 is fixed to the operation end 168 thereof. Rotating outwardly against the urging force of the ring 166, the serrated protrusion 164 finally comes into pressure contact with the inner surface of the outer tube 12. The pressing force in this case is doubled by the wedge effect of the taper provided in the lock piece 161.
[0048]
In such a pressed state, the movement of the apparatus main body 14 in the axial direction is restricted. That is, in the case of the present embodiment, in the lock mechanism 16, the rocking end side of the lock piece 161 is pressed against the inner surface of the outer tube 12 against the elastic force of the rubber ring 166, and And / or the movement of the piston 162 by the drive tube 20f 'and the elastic force of the rubber ring 166 result in one of an unlocked state separated from the inner surface of the outer tube 12, and these states are , By moving the piston 162 in the axial direction.
[0049]
Next, a method of injecting the injection material A for ground improvement into the ground E using the injection device 10 having the above configuration will be described with reference to FIG. In the figure, the outer pipe 12 is already buried in the ground E with the sealing material filling portion 24 having relatively low strength interposed therebetween.
[0050]
When injecting the injection material A, first, the injection device 10 is inserted and installed near the deepest portion of the outer tube 12. At this time, the locker 16 is unlocked while the packer 20 is contracted.
[0051]
When the device 10 is set at a predetermined position, a fluid is supplied to the drive tube 20f to expand the diameter of the cylindrical rubber 20b of the single packer 20, and to bring the cylindrical rubber 20b into close contact with the inner surface of the outer tube 12.
[0052]
This is performed in order to prevent the backflow of the injection material A when the injection material A is discharged from the distal end discharge port 18a of the injection inner tube 18. In the case of the present embodiment, at the same time, the fluid is also injected into the annular space 21 and the piston 162 moves along the axial direction. As the piston 162 moves, the locking mechanism 16 locks. The piece 161 swings outward, and as a result, the serrated protrusion 164 comes into pressure contact with the inner surface of the outer tube 12 to enter a locked state that restricts the axial movement of the apparatus main body 14.
[0053]
When such a state is secured, next, the injection material A is supplied to the injection inner pipe 18, and the injection material A is ejected from the discharge port 18a. When the space separated by the packer 20 is filled with the injection material A and the internal pressure increases, the check valve provided on the outer pipe 12 is opened as shown in FIG. The injection material A is injected and injected into the ground E from the discharge hole 12a to the outside thereof.
[0054]
In this case, the sealing material filling portion 24 is broken by the injection pressure of the injection material A, and the injection material A diffuses outward along cracks and porous portions in the ground E to improve the ground in a predetermined shape. An area is formed.
[0055]
When a predetermined amount of the injection material A is injected, the supply of the injection material A is stopped, the fluid is poured out and removed via the drive pipe 20f, and the cylindrical rubber 20b of the packer 20 is contracted, and The injection device 10 is moved upward by a predetermined distance while being separated from the inner surface of the tube 12 and also unlocking the lock piece 161 of the lock mechanism 16. After the movement, as shown in FIG. 3 (B), by repeatedly performing the same operation as above, the injection material A is injected into the ground E, and the ground is improved.
[0056]
Now, according to the ground improvement material injection device 10 configured as described above, when the injection material A is injected, the injection device A is brought into pressure contact with the inner surface of the outer tube 12 to lock the injection device body 14 in the axial direction, Further, a lock mechanism is provided which is capable of selecting one of an unlocked state in which the injection device main body 14 is allowed to move in the axial direction while being separated from the inner surface of the outer tube 12 when the injection device 10 is inserted and withdrawn. Therefore, if the lock state is set at the time of injecting the injection material A, even the single packer 20 can counter the axial movement of the injection device main body 14 due to the injection pressure of the injection material A, thereby ensuring the injection material A can be discharged into the ground.
[0057]
In this case, since the injection device 10 has only the single packer 20, it is possible to use an injection material having a short setting (short gel time) or an injection material having a high homogel strength. Also, when using an instantaneous injection material having a short gel time, the injection device 10 is prevented from moving even when injection is performed at a higher pressure.
[0058]
Further, in the case of the present embodiment, the piston 162 is in a locked state in which the swing end side of the lock piece 161 is pressed against the inner surface of the outer tube 12 against the elastic force of the rubber ring 166 by its axial movement. Since the elastic force of the rubber ring 166 causes the injection device main body 14 to be in either the unlocked state or the unlocked state separated from the inner surface of the outer tube 12, the axial movement of the injection device main body 14 can be restricted with a simple configuration.
[0059]
Further, in the case of the present embodiment, the lock piece 161 is provided with the serrated protrusion 164 at a portion facing the inner surface of the outer tube 12, so that when the serrated protrusion 164 is pressed against the outer tube 12, the outer tube 12 is pressed. Since the frictional force between the injection device main body 14 and the injection device main body 14 increases, the axial movement of the injection device main body 14 can be further restricted.
[0060]
FIGS. 4 and 5 show a second embodiment of the soil improving material injection device according to the present invention, in which the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted. A description thereof will be omitted, and only the characteristic points will be described below.
[0061]
In the second embodiment shown in these figures, the injection device 10a includes a device main body 14 and a lock mechanism 16a as in the above-described embodiment, and the device main body 14 includes an injection inner tube 18, a single packer 20, and the like. And has substantially the same configuration as the first embodiment.
[0062]
The lock mechanism 16a includes a holder 160a, a link mechanism 161a bent in a rectangular shape, and a piston 162a. The holder 160a is formed in a substantially truncated conical shape, is fixedly connected to the support cylinder 20a of the apparatus main body 14 by screw connection, and has a through hole 163a through which the injection inner tube 18 is inserted at the center. I have.
[0063]
The link mechanism portion 161a is formed by pin-connecting two link plates. One end of the link mechanism portion 161a is pin-connected to the holder 160a, and a protrusion 164a is provided at the bent end of the dogleg.
[0064]
As the link mechanism section 161a, three of the same configuration are used, and the three link mechanism sections 161a are arranged at equal angular intervals with respect to the center of the outer tube 12, as shown in FIG. Have been.
[0065]
The piston 162a includes a base 165a and an operation end 166a, and is driven by supplying a fluid between the base 165a and the operation end 166a via the drive pipe 20f, and the fluid supply position is the fourth position. This is different from the piston 162 of the embodiment.
[0066]
The distal end of the operating end 166a of the piston 162a is connected to the end of the link mechanism 161a via a connecting member 167a. The connecting member 167a is fitted on the outer peripheral surface of the operation end 166a, and slides along the axial direction of the infusion tube 18.
[0067]
According to the link mechanism section 16a configured as described above, in the steady state in which the fluid is injected into the annular space 21, as shown in the lower half of FIG. 4, the link mechanism section 161a, one end of which is supported by the holder 160a, The projection 164 a provided at the bent end is located at a position separated from the inner surface of the outer tube 12. In this case, as shown in FIG. 4, if the compression spring 180a is interposed in the link mechanism 161a so that the link mechanism 161a always bends in a U-shape, the projection 164a causes 12 can be stably maintained at a position away from the inner surface.
[0068]
In such a state, if the diameter of the packer 20 is not expanded, the apparatus main body 14 can be moved to an arbitrary position by operating the infusion tube 18.
[0069]
On the other hand, from this state, when fluid is injected between the base 165a and the operation end 166a via the drive pipe 20f, the piston 161a receives this injection pressure and moves from the position shown in the lower half of FIG. As shown in the upper half of FIG.
[0070]
When the piston 161a moves leftward along the axial direction, a connection member 167a that is connected to the link mechanism 161a is provided at the operation end 166a, and with this left movement, each link mechanism 161a The projection 164 a is bent in a rectangular shape and provided at the bent end to press against the inner surface of the outer tube 12.
[0071]
In such a pressed state, the pressing force is doubled by a wedge effect in which the projection 164a bites into the inner surface of the outer tube 12, and the movement of the apparatus body 14 in the axial direction is restricted. That is, in the case of the present embodiment, the locked state in which the projection 164a at the bent end of the link mechanism portion 161a is pressed against the inner surface of the outer tube 12, and the unlocked state in which the projection 164a at the bent end is separated from the inner surface of the outer tube 12. The state can be set to any of the states, and such a state is controlled by moving the piston 161a in the axial direction.
[0072]
Also in the second embodiment configured as described above, when the injection material A for ground improvement is injected into the ground E as shown in FIG. 3, the same operation and effect as in the first embodiment can be obtained. .
[0073]
FIGS. 6 and 7 show a third embodiment of the soil improving material injection device according to the present invention. The same or corresponding parts as those in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted. A description thereof will be omitted, and only the characteristic points will be described below.
[0074]
In the third embodiment shown in these figures, the injection device 10b includes the device main body 14 and the lock mechanism 16b as in the above-described embodiment, and the device main body 14 includes the injection inner tube 18, the single packer 20, and the like. And has substantially the same configuration as the first embodiment.
[0075]
The lock mechanism 16b includes a holder 160b, a link mechanism 161b bent in a rectangular shape, and a moving mechanism 162b of the link mechanism 161b.
[0076]
The holder 160b is formed in a substantially truncated conical shape, is connected and fixed to the support cylinder 20a of the apparatus main body 14 by screw connection, and has a through hole 163b through which the inner injection tube 18 is inserted at the center. .
[0077]
The link mechanism portion 161b is formed by pin-connecting two link plates. One end of the link mechanism portion 161b is pin-connected to the holder 160b, and a protrusion 164ba is provided at the bent end of the rectangular shape.
[0078]
Three link mechanisms 161b having the same configuration are used, and the three link mechanisms 161b are arranged at equal angular intervals with respect to the center of the outer tube 12, as shown in FIG. Have been.
[0079]
The moving mechanism 162b includes a slide cylinder 165b, a fixed cylinder 166b, a compression spring 167b, and a wire 168b. The slide cylinder 165b is slidably fitted on the outer periphery of the inner injection tube 18, and one end of a link mechanism 161b is pin-connected to the outer periphery.
[0080]
The fixed cylinder 166b is fixed to the outer periphery of the injection inner pipe 18, and the compression spring 167b is interposed between the slide cylinder 165b and the fixed cylinder 166b in a compressed state, and has a bent end of the link mechanism 161b. Of the outer tube 12 is constantly biased in the direction of pressing against the inner surface of the outer tube 12.
[0081]
One end of the wire 168b is connected to the slide cylinder 165b, and the other end is extended upward along the outer tube 12. When the wire 168b is pulled, the slide cylinder 165b slides toward the fixed cylinder 166b against the urging force of the compression spring 167b, and the projection 164b of the link mechanism 161b separates from the inner surface of the outer tube 12.
[0082]
According to the lock mechanism 16b configured as described above, as shown in the lower half of FIG. 6, when the wire 168b is pulled, the slide cylinder 165b moves toward the fixed cylinder 166b while compressing the compression spring 167b. In the link mechanism 161b, one end of which is supported by the holder 160b, the projection 164b provided at the bent end is located at a position separated from the inner surface of the outer tube 12.
[0083]
In such a state, if the diameter of the packer 20 is not expanded, the apparatus main body 14 can be moved to an arbitrary position by operating the infusion tube 18.
[0084]
On the other hand, when the tensile force applied to the wire 167b is removed from this state, the slide cylinder 165b receives the elastic force of the compression spring 167b from the position shown in the lower half of FIG. Move to the left as shown in.
[0085]
When the slide cylinder 165b moves to the left along the axial direction, one end of the link mechanism 161b is connected to the slide cylinder 165b. With this movement, each link mechanism 161b bends and bends in a rectangular shape. The protrusion 164b provided at the end presses against the inner surface of the outer tube 12.
[0086]
In such a pressed state, the movement of the apparatus main body 14 in the axial direction is restricted. That is, in the case of the present embodiment, the locked state in which the projection 164b at the bent end of the link mechanism portion 161b is pressed against the inner surface of the outer tube 12, and the unlocked state in which the projection 164b at the bent end is separated from the inner surface of the outer tube 12. State, and such a state is controlled by pulling the wire 168b.
[0087]
In the third embodiment configured as described above, when the injection material A for ground improvement is injected into the ground E as shown in FIG. 3, the same operation and effect as those of the first embodiment can be obtained. .
[0088]
FIG. 8 shows a fourth embodiment of the soil improvement material injection device according to the present invention. The same or corresponding portions as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Only the characteristic points will be described.
[0089]
The embodiment shown in the figure is a modification of the second embodiment. The injection device 10c includes an apparatus main body 14 and a lock mechanism 16a, and the apparatus main body 14 includes an injection inner pipe 18, a single packer. 20 and the like, and the configuration of these parts is substantially the same as that of the second embodiment.
[0090]
In the case of this embodiment, the injection inner pipe 18 provided on the central axis of the apparatus main body 14 has a double pipe structure of a main material injection pipe 180 and a hardener injection pipe 181. The main material injection pipe 180 accommodates the hardener injection pipe 181 therein, and is supplied through an annular portion formed on the outer periphery of the hardener injection pipe 181. It is closed by the valve 182.
[0091]
The hardening agent injection pipe 181 has a distal end closed, and a discharge hole 184 closed by a check valve 183 is provided near the distal end. When the main material and the curing agent are supplied to each of the pipes 180 and 181, they open the check valves 182 and 183, merge at the distal end side, and thereafter are discharged from the discharge port.
[0092]
The adoption of such a double pipe structure makes it possible to use quick-injection, high-strength injection material that could not be used with the double packer device, and to alternately use warm-up type injection material And the efficiency of construction is improved.
[0093]
【The invention's effect】
As described above in detail with the embodiment, according to the soil improvement material injection device according to the present invention, when the injection material is injected, the device main body is securely locked to the outer pipe, and the packer portion is a single packer. However, the injection device can withstand the movement of the injection device due to the injection pressure of the injection material, and the injection material can be reliably discharged, and the insertion and withdrawal of the injection device can be smoothly performed without contacting the outer tube. it can.
[0094]
In addition, by using a single packer as the packer, it is possible to use a quick-setting, high-strength filling material that could not be used with a double packer, and alternately switch between this and a warm-setting type filling material. Can be used to improve construction efficiency
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of a ground improvement material injection device according to the present invention.
FIG. 2 is a sectional view of a main part of FIG.
FIG. 3 is an explanatory view of a use state of the injection device shown in FIG.
FIG. 4 is a vertical sectional view showing a second embodiment of the soil improvement material injection device according to the present invention.
FIG. 5 is a sectional view of a main part of FIG.
FIG. 6 is a vertical sectional view showing a third embodiment of the soil improving material injection device according to the present invention.
FIG. 7 is a sectional view of a main part of FIG. 6;
FIG. 8 is a vertical sectional view showing a fourth embodiment of the soil improvement material injection device according to the present invention.
[Explanation of symbols]
10, 10a, 10b, 10c injection device
12 outer tube
14 Main unit
16, 16a, 16b Lock mechanism
18 Injection inner tube
20 Single Packer
21 Annular space

Claims (8)

An outer pipe buried in the ground, or an injection device that is inserted into a drilled hole formed in the ground and discharges a ground improvement injection material toward the ground,
The injection device includes a device main body installed in the outer tube, and a lock mechanism connected to the rear of the device main body,
The apparatus main body is provided on a central axis, opens an injection material discharge port at the tip, and an injection inner pipe to which the injection material is supplied from the upper side,
A diameter of which is increased by injection of a fluid, and the outer tube or the inner surface of the hole is in close contact with the inner surface of the outer tube, and a single packer is separated from the inner surface of the outer tube by removing the fluid;
The lock mechanism, during the injection of the injection material, the outer tube or the pressurized contact with the inner surface of the hole, the lock state to regulate the axial movement of the injection device body, and at the time of insertion and withdrawal of the injection device, An injection device for a soil improvement material, wherein the injection device is separated from an inner surface of the outer pipe to be in one of an unlocked state that allows the injection device main body to move in an axial direction. The lock mechanism is disposed on the outer periphery of the injection inner tube, and includes a holder connected to the injection device body, a plurality of lock pieces, and a piston,
One end of the lock piece is swingably supported by the holder, a rubber ring is attached to the swing end, and the lock piece is contracted toward the center axis.
The piston has a taper member engaged with the lock piece at a tip thereof, and is axially moved along the outer periphery of the injection inner tube by injection of a fluid, and the rocking end side of the lock piece is formed of the rubber. A lock state in which the outer tube is pressed against the inner surface of the outer tube against the elastic force of the ring, and an unlocked state in which the rubber tube is separated from the inner surface of the outer tube by the elastic force of the rubber ring. The injection device for a ground improvement material according to claim 1, wherein The apparatus for injecting a ground improvement material according to claim 2, wherein the lock piece has a saw-toothed projection at a portion facing the inner surface of the outer pipe. The lock mechanism is disposed on the outer periphery of the infusion inner tube, and includes a holder connected to the infusion device body, a plurality of link mechanism portions bent in a rectangular shape, and a piston,
One end of the link mechanism is pin-connected to the holder,
The piston has a distal end connected to the link mechanism, moves in the axial direction by injecting a fluid, and a bent state of the link mechanism is pressed against the inner surface of the outer tube. 2. The apparatus for injecting a ground improvement material according to claim 1, wherein the apparatus is set in any one of an unlocked state separated from an inner surface of the pipe. The apparatus for injecting a ground improvement material according to any one of claims 2 to 4, wherein the expanding and contracting drive unit of the packer also serves as a drive unit for moving the piston in the axial direction. The lock mechanism is disposed on the outer circumference of the infusion tube, and is connected to the infusion device main body, a plurality of link mechanisms bent in a V shape, and moves the link mechanism along the axial direction. And a moving mechanism,
Both ends of the link mechanism unit are connected to the holder and the drive unit,
The moving mechanism unit includes a compression spring that urges the bent end of the link mechanism unit to press against the inner surface of the outer tube,
Either a locked state where the bent end of the link mechanism is pressed against the inner surface of the outer tube or an unlocked state where the bent end is separated from the inner surface of the outer tube when the moving mechanism moves in the axial direction. 2. The apparatus for injecting a ground improvement material according to claim 1, wherein said apparatus is in a state. The moving mechanism unit is coupled to one end of a slide cylinder that moves axially along the outer peripheral surface of the injection inner tube, and operates the link mechanism unit in the axial direction by operating a wire extending above the outer tube. The apparatus for injecting a ground improvement material according to claim 6, wherein the apparatus is moved along. The injection inner pipe has a double structure of a main material injection pipe and a hardener injection pipe, and mixes the main material and the hardener at a tip portion of the main material injection pipe and the hardener injection pipe. The soil improvement material injection device according to any one of claims 1 to 7, characterized in that:

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