JP4081381B2 - Ground improvement material injection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an injection device for injecting a chemical solution such as a hardener into the ground, and more particularly to an injection device for an injection material used for ground improvement.
[0002]
[Prior art]
Conventionally, as a chemical 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 Literature 1, Patent Literature 2, and Patent Literature 3).
The injection method using this double packer device is to drill the ground to a predetermined depth while inserting the casing, build the outer pipe in the casing, fill the seal material, and then install the inner pipe with the double packer at the tip. It is inserted into the outer tube, a closed space is created by the expansion of the upper and lower packers, and the ground improvement injection material is discharged into the ground through the closed space from the injection holes provided between the packers.
By injecting the ground improvement injection material in this way, the injection material can be injected into the specified ground without overflowing to the ground along the outer pipe, especially in the case of composite ground, the certainty of the ground improvement effect Is a high construction method.
However, such a conventional double packer apparatus and construction method have the following technical problems.
[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 is provided with a pair of packers at a predetermined interval, there is a problem that the full length becomes long and the double packer device cannot be inserted when the hole is bent.
[0007]
In addition, in the case of using an injecting material having a quick setting (short gel time) or an injecting material having a high homogel strength, when an injecting material having such properties is injected from a space blocked between packers, The injection material is hardened, and the packer and the periphery of the packer are fixed to the outer tube by the injection material, making it difficult for the packer to contract, and even if it is contracted, there is a problem that the upper side cannot be stepped up The injection material having such properties could not be applied to a conventional double packer apparatus.
[0008]
In order to solve such a problem, for example, instead of a double packer, an injection device constituted by a single packer is conceivable. However, an injection device having such a configuration has another technical description described below. There was a serious problem.
[0009]
That is, 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, but when viewed from the whole device, pressure balance works, and the packer The position could be fixed.
[0010]
However, when the configuration is changed from double to single, the thrust to push up the single packer acts on the single packer due to the injection pressure of the injection material, and only with the frictional force between the outer tube and the packer, It becomes difficult to fix the entire apparatus at a predetermined position, and there arises a problem that the entire apparatus moves upward.
[0011]
In this case, in particular, when using an injectable material having high strength and a short gel time, it is necessary to inject at a higher pressure. Affects the reliable injection of the injection material.
[0012]
The present invention has been made in view of such problems, and the object of the present invention is that it can be easily inserted into and extracted from the ground, and can be applied to a high-strength and quick-setting injectable agent. Another object of the present invention is to provide an injection device for ground improvement material that is securely locked in place.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an injection apparatus that is inserted into an outer tube embedded in the ground or a drilled hole formed in the ground, and discharges the ground improvement injection material toward the ground. , The injection device is the outer tubeOr drillingAn apparatus main body installed inside, 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 opened at the tip, An injection inner tube to which an injection material is supplied, and the outer tube expanded by injection of fluidOr drillingThe outer tube is adhered to the inner surface of the outer tube and the fluid is removed.Or drillingWith a single packer spaced from the inner surface ofAn injection device for a ground improvement material, wherein the lock mechanism includes a holder disposed on the outer periphery of the injection inner pipe and connected to the injection device main body, a plurality of lock pieces, and a piston. One end of the piece is swingably supported by the holder, a rubber ring is attached to the swing end, and is contracted toward the central axis, and the piston is engaged with the lock piece at the tip. A taper member to be joined is fixed and moved in the axial direction along the outer periphery of the injection inner tube by injecting fluid, and when the injection material is injected, the rocking end side of the lock piece is elastic force of the rubber ring. Against the inner surface of the outer tube or the hole, due to the locked state in pressure contact with the outer tube or the inner surface of the hole and the elastic force of the rubber ring when the injection device is inserted and withdrawn. It was set to be one of the state of the state.
[0014]
According to the ground improvement material injection device configured as described above, the locking mechanism is:When the injection material is injected, it is either in a locked state where it is pressed against the inner surface of the outer tube or drilling hole, or in an unlocked state where it is separated from the inner surface of the outer tube or drilling hole when the injection device is inserted or pulled outTherefore, when the injection material is in a locked state when injected, even a single packer can counteract the axial movement of the injection device body due to the injection pressure of the injection material. Can be discharged.In addition, when the piston moves in the axial direction, the rocking end side of the lock piece resists the elastic force of the rubber ring and presses against the inner surface of the outer tube or drilling hole, and the elastic force of the rubber ring causes the outer tube or Since the unlocked state is separated from the inner surface of the hole, the axial movement of the injection device body can be restricted with a simple configuration.
[0017]
The lock piece may be provided with a sawtooth projection at a portion facing the inner surface of the outer tube.
[0018]
According to this configuration, when the serrated protrusion is pressed against the outer tube, the frictional force with the outer tube is increased, so that the axial movement of the injection device main body can be more firmly restricted.
[0019]
Further, the present invention is an injection device that is inserted into an outer tube embedded in the ground or a drilling hole formed in the ground, and discharges an injection material for ground improvement toward the ground. An apparatus main body installed in the outer tube or the drilling hole, and a lock mechanism connected to the rear of the apparatus main body, the apparatus main body is provided on the central axis, and an injection material discharge port is opened at the tip And the inner pipe to which the injecting material is supplied from the upper side, and the diameter of the inner pipe is increased by injecting the fluid to closely contact the inner surface of the outer pipe or drilling hole, and the outer pipe or drilling hole is removed by removing the fluid A ground improvement material injection device having a single packer spaced from the inner surface ofThe lock mechanism includes a holder that is disposed on an outer periphery of the injection inner pipe and is connected to the injection apparatus body, a plurality of link mechanism parts bent in a square shape, and a piston, and the link mechanism part includes one end The side of the piston is connected to the holder, and the piston is connected to the link mechanism part at the tip side, and moves in the axial direction by injecting fluid, and when the injection material is injected, the bent end of the link mechanism part isThe locked state in pressure contact with the outer tube or the inner surface of the hole, and the bent end is the inner surface of the outer tube or the hole when the injection device is inserted and pulled outIt can be in any of the unlocked states that are separated from each other.
[0020]
The diameter expansion and contraction drive unit of the packer can also be used as the drive unit for axial movement of the piston.According to this configuration, the injection device can be simplified.
[0021]
Further, the present invention is an injection device that is inserted into an outer tube embedded in the ground or a drilling hole formed in the ground, and discharges an injection material for ground improvement toward the ground. An apparatus main body installed in the outer tube or the drilling hole, and a lock mechanism connected to the rear of the apparatus main body, the apparatus main body is provided on the central axis, and an injection material discharge port is opened at the tip And the inner pipe to which the injecting material is supplied from the upper side, and the diameter of the inner pipe is increased by injecting the fluid to closely contact the inner surface of the outer pipe or drilling hole, and the outer pipe or drilling hole is removed by removing the fluid A ground improvement material injection device having a single packer spaced apart from the inner surface of the injection device, wherein the locking mechanism is disposed on the outer periphery of the injection inner tube, and is bent in a square shape with a holder connected to the injection device main body. A plurality of link mechanism sections, And a moving mechanism that moves the moving mechanism along the axial direction. Both ends of the link mechanism are coupled to the holder and the moving mechanism, and the moving mechanism is a bent end of the link mechanism. Is provided with a compression spring that urges the outer tube or the inner surface of the drilling hole so as to be in pressure contact with each other, and when the moving mechanism portion is moved in the axial direction, the bent end of the link mechanism portion is injecting the injection material, Either the locked state in pressure contact with the outer tube or the inner surface of the hole or the unlocked state in which the bent end is separated from the inner surface of the outer tube or the hole when the injection device is inserted and pulled out. it can.
[0022]
The moving mechanism is coupled to one end of a slide cylinder that moves in an axial direction along the outer peripheral surface of the injection inner tube, and the outer tubeOr drillingThe link mechanism portion can be moved along the axial direction by operating a wire extending upward.
[0023]
The injection inner pipe has a double structure of a main material injection pipe and a hardener injection pipe, and the main material and the hardener can be mixed at a tip portion of the main material injection pipe and the hardener injection pipe. it can.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a first embodiment of a ground improvement material injecting apparatus according to the present invention. FIG. 1 is a longitudinal sectional view and FIG. 2 is a sectional view of an essential part of FIG. .
[0025]
The injection device 10 shown in the figure is inserted into the outer pipe 12 embedded in the ground E and injects an injection material A for ground improvement. The outer tube 12 is a hollow tube that is open at both ends. As shown in FIG. 3, the outer tube 12 has a discharge hole for discharging the injection material A poured out from the injection device 10 to the ground. 12a is drilled at an arbitrary location.
[0026]
The discharge hole 12a of the outer tube 12 may be provided at regular intervals along the longitudinal direction of the outer tube 12 or may be provided with a check valve structure for preventing a backflow from the outside of the tube. Further, in the following embodiment, an application example in which the outer tube 12 is embedded in a drilling hole formed in the ground and the injection device 10 is inserted into the outer tube 12 is shown. Implementation of the invention is not limited to this embodiment, and the injection device 10 may be inserted directly into the drilling 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 injection inner tube 18 and a single packer 20.
[0028]
The injection inner tube 18 is a hollow cylindrical tube that is disposed on the central axis O of the outer tube 12 and is open at both ends. The discharge port 18a of the injection material A is formed on the tip side, and the upper end side is not shown. The injection material A is supplied from the upper side.
[0029]
The single packer 20 is disposed on the outer peripheral side of the injection inner tube 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 screwed to the injection inner tube 18 at the lower end side, and is arranged on the outer periphery of 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. Yes.
[0031]
The cylindrical rubber 20b is extendable and formed in a cylindrical shape with both ends open, and the cylindrical open end is sandwiched between rubber holders 20c. The rubber holder 20c is fixedly provided on the outer peripheral surfaces of 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 tube 20f, this is filled in the closed space 20e, and the cylindrical rubber 20b is expanded. The outer surface of the cylindrical rubber 20b having a diameter increased and abutted against the inner surface of the outer tube 12 is in close contact with the inner surface.
[0033]
In such a close contact state, when fluid is poured out and removed from the enclosed space 20e through the drive tube 20f, the expanded state of the cylindrical rubber 20b contracts, and the outer surface of the cylindrical rubber 20b Separate from the inner surface of the tube 12.
[0034]
On the other hand, the lock mechanism 16 includes a holder 160, a plurality of lock pieces 161, and a piston 162 in this embodiment. The holder 160 is formed in a substantially truncated cone shape, and is connected and fixed to the end of the support cylinder 20a of the packer 20 via a screw, and a through hole 163 is formed through the center.
[0035]
Further, one end of three lock pieces 161 is pin-coupled to the side surface of the holder 160. As shown in FIG. 2, the three lock pieces 161 are arranged at equiangular intervals with respect to the center of the outer tube 12 and are supported by the holder 160 so as to be swingable.
[0036]
2 is a fluid supply hose connected to the drive pipes 20f and 20f ′. In this embodiment, one drive pipe 20f is formed as described later. The diameter expansion / contraction drive part of the packer 20 is also used as the drive part for axial movement of the piston 162, and the other drive pipe 20f 'is a space part 21 on the operation side of the piston 162 as shown in FIG. It communicates with (outer part 168 in the figure).
[0037]
The drive tube 20f ′ supplies the fluid to forcibly move the piston 162 in the left direction in FIG. 2 along the axial direction of the injection inner tube 18, and by the biasing force of the rubber ring 166, The unlocked state in which the lock piece 161 is contracted by the central axis is assisted. The drive tube 20f 'is not necessarily required if the unlocked state can be stably maintained by appropriately selecting the elastic force of the rubber ring 166.
[0038]
A serrated projection 164 is formed on the outer surface side of each lock piece 161 at a position facing the inner surface of the outer tube 12. Further, 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 attached to the rocking end side of each lock piece 161, whereby the three lock pieces 161 are urged so as to always contract toward the central axis O side.
[0040]
The piston 162 includes a base 167 and an operation end 168 extended to one end of the base 167, and the base 167 is installed in an annular space 21 separated by the injection inner tube 18 and the support tube 20a. The operation end 168 is inserted through the through hole 163 of the holder 160 fitted to the outer periphery of the injection inner pipe 18 and extends to the lower side of 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 tip of the operation end 168 of the piston 162.
[0042]
In the case of the present embodiment, the tip end side of the drive tube 20f of the packer 20 is also communicated with the annular space 21, and the diameter expansion and contraction drive portion of the packer 20 is the driving for moving the piston 162 in the axial direction. The injection device 10 is simplified by this.
[0043]
In the lock mechanism 16 configured as described above, in a steady state where no fluid is injected into the annular space 21, the lock piece 161 supported by the holder 160 in a swingable manner is provided at the swing end as shown in the lower half of FIG. Since the side is biased by the rubber ring 166 so as to contract toward the central axis O, the side is 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 taper member 169 are engaged, the piston 162 is moved to the front end side of the apparatus main body 14 due to the urging force of the rubber ring 166. In this case, the piston 162 may be forcibly moved by the fluid pressure. Further, the movement range of the piston 162 at this time is restricted by the step portion 22 provided in the annular space 21.
[0045]
In such a state, the serrated projection 164 of the lock piece 161 is separated from the inner surface of the outer tube 12, so that if the packer 20 is not expanded in diameter, the device main body 14 is moved by operating the injection inner tube 18. It can be moved to any position.
[0046]
On the other hand, when fluid is injected into the annular space 21 through the drive tube 20f from this state, the piston 162 receives this injection pressure and from the position shown in the lower half of FIG. Move to the right as shown in.
[0047]
When the piston 162 moves to the right along the axial direction, a taper member 169 that engages with the inclined surface 165 is fixed to the operation end 168. The ring 166 is rotated outwardly against the urging force of the ring 166, and finally, the sawtooth protrusion 164 comes into pressure contact with the inner surface of the outer tube 12. The pressure contact force in this case is doubled by the wedge effect due to the taper provided on the lock piece 161.
[0048]
In such a pressure contact state, the apparatus main body 14 is restricted from moving in the axial direction. In other words, 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 the rubber ring 166. And / or the movement of the piston 162 by the drive tube 20f ′ and the elastic force of the rubber ring 166 result in an unlocked state separated from the inner surface of the outer tube 12, and these states are It is controlled by moving the piston 162 in the axial direction.
[0049]
Next, a method for injecting the ground improvement material A into the ground E by using the injection device 10 having the above configuration will be described with reference to FIG. In the figure, the outer tube 12 has already been embedded in the ground E with a sealing material filling portion 24 having a relatively low strength interposed therebetween.
[0050]
When injecting the injection material A, the injection device 10 is first inserted and installed in the vicinity of the deepest portion of the outer tube 12. At this time, the packer 20 is contracted and the lock mechanism 16 is also unlocked.
[0051]
When the apparatus 10 is set at a predetermined position, a fluid is supplied to the drive tube 20f, the diameter of the cylindrical rubber 20b of the single packer 20 is expanded, and this is brought into close contact with the inner surface of the outer tube 12.
[0052]
This is performed to prevent backflow 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 injected into the annular space 21 and the piston 162 moves along the axial direction. Therefore, as the piston 162 moves, the lock mechanism 16 is locked. The piece 161 swings and moves outward, and as a result, the serrated protrusion 164 comes into pressure contact with the inner surface of the outer tube 12 and enters a locked state that restricts the axial movement of the apparatus main body 14.
[0053]
When such a state is ensured, 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 injection material A is filled in the space defined by the packer 20 and the internal pressure increases, as shown in FIG. 3 (A), the check valve provided in the outer pipe 12 is opened, The injection material A is injected and injected into the ground E from the discharge hole 12a to the outside.
[0054]
In this case, the sealing material filling portion 24 is destroyed by the injection pressure of the injection material A, and the injection material A diffuses outward along the crack portion and the porous portion in the ground E to improve the ground shape of a predetermined shape. A region 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 through the drive tube 20f, the cylindrical rubber 20b of the packer 20 is contracted, and the outside While being separated from the inner surface of the tube 12, the lock piece 161 of the lock mechanism 16 is also unlocked, and the injection device 10 is moved upward by a predetermined distance. After the movement, as shown in FIG. 3 (B), the same operation as described above is sequentially repeated, whereby the injection material A is injected into the ground E, and the ground is improved.
[0056]
Now, according to the injection device 10 of the ground improvement material configured as described above, when the injection material A is injected, the locked state that presses the inner surface of the outer tube 12 and restricts the axial movement of the injection device main body 14; A locking mechanism is provided that allows selection of either an unlocked state that allows the axial movement of the injection device main body 14 while being spaced apart from the inner surface of the outer tube 12 when the injection device 10 is inserted and withdrawn. Therefore, when the injection material A is in the locked state at the time of injection, 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 reliably injecting 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 quick setting property (short gel time) or an injection material having a high homogel strength. When using a quick-set injection material with 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 the axial movement thereof. Since the elastic force of the rubber ring 166 results in either an 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 this embodiment, the lock piece 161 is provided with a sawtooth projection 164 at a portion facing the inner surface of the outer tube 12, so that when the sawtooth projection 164 is pressed against the outer tube 12, the outer tube The frictional force between the injection device main body 14 and the injection device main body 14 can be further restricted in the axial direction.
[0060]
4 and 5 show a second embodiment of the ground improvement material injecting apparatus 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 given. While omitted, only the feature points will be described below.
[0061]
In the second embodiment shown in these drawings, the injection device 10a includes the device main body 14 and the lock mechanism 16a as in the above-described embodiment. 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.
[0062]
The lock mechanism 16a includes a holder 160a, a link mechanism portion 161a bent into a square shape, and a piston 162a. The holder 160a is formed in a substantially truncated cone shape, and is connected and fixed to the support cylinder 20a of the apparatus main body 14 by screw connection. A through-hole 163a through which the injection inner tube 18 is inserted is formed in the center. Yes.
[0063]
The link mechanism portion 161a is obtained by pin-coupling two link plates. One end side of the link mechanism portion 161a is pin-coupled to the holder 160a, and a protrusion 164a is provided at the bent end of the square shape.
[0064]
Three link mechanism portions 161a having the same configuration are used, and the three link mechanism portions 161a are arranged at equal angular intervals with respect to the center of the outer tube 12, as shown in FIG. Has been.
[0065]
The piston 162a includes a base portion 165a and an operation end 166a, and is driven by supplying a fluid between the base portion 165a and the operation end 166a via the drive tube 20f. This is different from the piston 162 of one embodiment.
[0066]
The distal end of the operation end 166a of the piston 162a is connected to the end portion of the link mechanism portion 161a via a connecting member 167a. The connecting member 167a is fitted to the outer peripheral surface of the operation end 166a, and slides along the axial direction of the injection inner tube 18.
[0067]
According to the link mechanism portion 16a configured as described above, in a steady state in which fluid is injected into the annular space 21, the link mechanism portion 161a whose one end is supported by the holder 160a as shown in the lower half of FIG. The protrusion 164a provided at the bent end is located away from the inner surface of the outer tube 12. In this case, as shown in FIG. 4, when the compression spring 180a is interposed in the link mechanism portion 161a so that the link mechanism portion 161a is always bent in a square shape, the protrusion 164a is formed in the outer tube. Thus, it is possible to stably maintain the state of being separated from the inner surface of 12.
[0068]
In such a state, if the diameter of the packer 20 is not expanded, the device main body 14 can be moved to an arbitrary position by operating the injection inner tube 18.
[0069]
On the other hand, when fluid is injected between the base portion 165a and the operation end 166a through the drive tube 20f from this state, the piston 161a receives this injection pressure and from the position shown in the lower half of FIG. As shown in the upper half of the figure, it moves toward the left.
[0070]
When the piston 161a moves leftward along the axial direction, a connecting member 167a that is connected to the link mechanism portion 161a is provided at the operation end 166a. With this movement to the left, each link mechanism portion 161a The protrusion 164a provided at the bent end is pressed against the inner surface of the outer tube 12 by bending into a square shape.
[0071]
In such a pressure contact state, the pressure contact force is doubled by the wedge effect that the protrusion 164a bites into the inner surface of the outer tube 12, and 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 164a at the bent end of the link mechanism portion 161a is in pressure contact with 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 one of the states, and such a state is controlled by moving the piston 161a in the axial direction.
[0072]
Even in the second embodiment configured as described above, the same effects as those in the first embodiment can be obtained when the injection material A for ground improvement is injected into the ground E as shown in FIG. .
[0073]
6 and 7 show a third embodiment of the ground improvement material injecting apparatus according to the present invention. The same or corresponding parts as those in the first embodiment are designated by the same reference numerals and the description thereof is omitted. While omitted, only the feature points will be described below.
[0074]
In the third embodiment shown in these drawings, the injection device 10b includes a device main body 14 and a lock mechanism 16b as in the above 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 portion 161b bent into a square shape, and a moving mechanism portion 162b of the link mechanism portion 161b.
[0076]
The holder 160b is formed in a substantially truncated cone shape and is connected and fixed to the support cylinder 20a of the apparatus main body 14 by screw connection, and a through-hole 163b through which the injection inner tube 18 is inserted is formed in the center. .
[0077]
The link mechanism portion 161b is obtained by pin-coupling two link plates. One end side of the link mechanism portion 161b is pin-coupled to the holder 160b, and a protrusion 164ba is provided at the bent-shaped bent end.
[0078]
Three link mechanism portions 161b having the same configuration are used, and the three link mechanism portions 161b are arranged at equal angular intervals with respect to the center of the outer tube 12, as shown in FIG. Has been.
[0079]
The moving mechanism unit 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 injection inner tube 18, and one end of the link mechanism portion 161b is pin-coupled 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 the bent end of the link mechanism portion 161b. The protrusion 164b constantly urges in the direction in which it is pressed against the inner surface of the outer tube 12.
[0081]
One end of the wire 168 b is coupled to the slide cylinder 165 b, and the other end extends 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 protrusion 164b of the link mechanism portion 161b is separated 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 portion 161b whose one end is supported by the holder 160b, the projection 164b provided at the bent end is located at a position away 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 device main body 14 can be moved to an arbitrary position by operating the injection inner 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, and from the position shown in the lower half of FIG. As shown in FIG.
[0085]
When the slide cylinder 165b moves to the left along the axial direction, one end of the link mechanism portion 161b is connected to the slide tube 165b, so that each link mechanism portion 161b bends and bends along the left side as the slide cylinder 165b moves. The protrusion 164b provided at the end is in pressure contact with the inner surface of the outer tube 12.
[0086]
In such a pressure contact state, the apparatus main body 14 is restricted from moving in the axial direction. 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. The state can be set to any one of the states, and such a state is controlled by pulling the wire 168b.
[0087]
Even in the third embodiment configured as described above, the same effects as those in the first embodiment can be obtained when injecting the injection material A for ground improvement into the ground E as shown in FIG. .
[0088]
FIG. 8 shows a fourth embodiment of the ground improvement material injecting apparatus according to the present invention. The same or corresponding parts as those in the above embodiment are designated by the same reference numerals and the description thereof is omitted. Only the feature points will be described.
[0089]
The embodiment shown in the figure is a modification of the second embodiment, and the injection apparatus 10c includes an apparatus main body 14 and a lock mechanism 16a. The apparatus main body 14 includes an injection inner tube 18 and 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 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 inside and is supplied via an annular portion formed on the outer periphery of the hardener injection pipe 181. It is closed by a valve 182.
[0091]
The hardener injection pipe 181 is closed at the tip, and a discharge hole 184 closed by a check valve 183 is provided in the vicinity thereof. When the main material and the curing agent are supplied to the pipes 180 and 181, they open the check valves 182 and 183, merge at the tip side, and then are discharged from the discharge port.
[0092]
Adopting a double-pipe structure with such a configuration allows you to use high-strength injection materials that cannot be used with double packer devices, and to switch between warm-type injection materials alternately. It becomes easy to do and construction efficiency improves.
[0093]
【The invention's effect】
As described above in detail with reference to the examples, according to the ground 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 tube, and the packer portion is a single packer. However, it can withstand the movement of the injection device body due to the injection pressure of the injection material, the injection material can be reliably discharged, and the injection device can be smoothly inserted and withdrawn without contacting the outer tube. it can.
[0094]
In addition, by using a single packer for the packer, it is possible to use a quick-setting / high-strength injection material that could not be used with a double packer, and to switch between this and a warm-in type injection material alternately. Construction efficiency is also improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal explanatory view showing a first embodiment of an apparatus for injecting ground improvement material according to the present invention.
FIG. 2 is a cross-sectional view of the main part of FIG.
FIG. 3 is an explanatory diagram of a use state of the injection device shown in FIG. 1;
FIG. 4 is a longitudinal explanatory view showing a second embodiment of the ground improvement material injection device according to the present invention.
5 is a cross-sectional view of the main part of FIG. 4;
FIG. 6 is a longitudinal explanatory view showing a third embodiment of the ground improvement material injection device according to the present invention.
7 is a cross-sectional view of the main part of FIG. 6;
FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the ground improvement material injecting apparatus according to the present invention.
[Explanation of symbols]
10, 10a, 10b, 10c injection device
12 Outer pipe
14 Device body
16, 16a, 16b Lock mechanism
18 Inner pipe
20 Single packer
21 annular space

Claims (7)

In an injection pipe that is inserted into an outer pipe embedded in the ground or a drilling hole formed in the ground, and discharges an injection material for ground improvement toward the ground,
The injection device includes a device main body installed in the outer tube or drilling hole , and a lock mechanism connected to the rear of the device main body,
The apparatus main body is provided on a central axis, has an injection material discharge port opened at the tip, and an injection inner pipe to which the injection material is supplied from the upper side,
And expanded by injection of fluid, as well as in close contact with the outer tube or drilling of the inner surface, an injection device for soil improvement material having a single packer to separate from the outer tube or drilling of the inner surface by removal of the fluid There,
The locking mechanism is disposed on the outer periphery of the injection inner pipe, and includes a holder connected to the injection device main body, a plurality of lock pieces, and a piston,
One end side of the lock piece is swingably supported by the holder, a rubber ring is attached to the swing end side, and the lock piece is contracted toward the central axis side,
The piston has a taper member that engages with the lock piece at the tip, and moves in the axial direction along the outer periphery of the injection inner tube by injecting fluid,
At the time of injection of the injection material, the rocking end side of the lock piece is in a locked state in pressure contact with the outer tube or the inner surface of the drilled hole against the elastic force of the rubber ring,
The ground improvement material injection device according to claim 1, wherein when the injection device is inserted and withdrawn, the elastic force of the rubber ring is set to an unlocked state separated from the inner surface of the outer tube or the drilling hole . 2. The ground improvement material injecting apparatus according to claim 1, wherein the lock piece has a sawtooth projection at a portion facing the inner surface of the outer tube. In an injection pipe that is inserted into an outer pipe embedded in the ground or a drilling hole formed in the ground, and discharges an injection material for ground improvement toward the ground,
The injection device includes a device main body installed in the outer tube or drilling hole, and a lock mechanism connected to the rear of the device main body,
The apparatus main body is provided on a central axis, has an injection material discharge port opened at a tip, and an injection inner pipe to which the injection material is supplied from the upper side,
A ground improvement material injection device having a single packer that expands in diameter by injecting fluid and is in close contact with the inner surface of the outer tube or drilling hole and is separated from the inner surface of the outer tube or drilling hole by removing the fluid. There,
The locking mechanism includes a holder that is disposed on the outer periphery of the injection inner pipe and is connected to the injection apparatus main body, a plurality of link mechanism portions bent in a square shape, and a piston.
One end side of the link mechanism is pin-connected to the holder,
The piston is connected to the link mechanism portion at the tip side, and moves in the axial direction by injecting fluid,
When the injection material is injected, the bent end of the link mechanism portion is in pressure contact with the inner surface of the outer tube or drilling hole, and when the injection device is inserted and withdrawn, the bent end is inserted into the outer tube or drilling hole. An injection device for ground improvement material, which is in an unlocked state separated from the inner surface. 4. The ground improvement material injection device according to claim 1, wherein the expansion and contraction driving unit of the packer is also used as a driving unit for moving the piston in the axial direction. 5. In an injection pipe that is inserted into an outer pipe embedded in the ground or a drilling hole formed in the ground, and discharges an injection material for ground improvement toward the ground,
The injection device includes a device main body installed in the outer tube or drilling hole, and a lock mechanism connected to the rear of the device main body,
The apparatus main body is provided on a central axis, has an injection material discharge port opened at a tip, and an injection inner pipe to which the injection material is supplied from the upper side,
A ground improvement material injection device having a single packer that expands in diameter by injecting fluid and is in close contact with the inner surface of the outer tube or drilling hole and is separated from the inner surface of the outer tube or drilling hole by removing the fluid. There,
The lock mechanism is arranged on the outer periphery of the injection inner tube, and moves the holder along the axial direction, a holder connected to the injection device main body, a plurality of link mechanism portions bent in a square shape, and the link mechanism portion. A moving mechanism,
Both ends of the link mechanism unit are connected to the holder and the moving mechanism unit, and the moving mechanism unit compresses the bent end of the link mechanism unit so as to press-contact the inner surface of the outer tube or the drilled hole. With springs,
When the moving mechanism portion is moved in the axial direction, the bent end of the link mechanism portion is in a locked state where it is pressed against the inner surface of the outer tube or the drilling hole when the injection material is injected, and when the injection device is inserted and pulled out. The ground improvement material injecting apparatus, wherein the bent end is in an unlocked state in which the bent end is separated from the inner surface of the outer tube or the drilling hole. The moving mechanism unit is coupled to one end of a slide cylinder that moves in the axial direction along the outer peripheral surface of the injection inner tube, and the link mechanism unit is operated by operating a wire extending above the outer tube or drilling hole. The ground improvement material injecting apparatus according to claim 5, wherein the base material is moved along the axial direction. The injection inner pipe has a double structure of a main material injection pipe and a hardener injection pipe, and the main material and the hardener are mixed at a tip portion of the main material injection pipe and the hardener injection pipe. The ground improvement material injection device according to any one of claims 1 to 6, wherein the ground improvement material injection device is one of the above.

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