JP3574101B2 - Ground improvement equipment using powder material - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
Using solidified powder materialToGround improvementRelated to the device.
[0002]
[Prior art]
As a construction method for improving the ground, a rotating rod having a stirring blade protruding is inserted into the ground while rotating, and during a process of insertion and lifting, a solidified material (hereinafter, referred to as a granular material) is formed from a predetermined portion of the improved rod. There is known a method of injecting a solidified material) to form a solidified body in the ground and treating the soft ground.
[0003]
For example, what is known as a deep mixing treatment method corresponds to this.
[0004]
In general, in the deep mixing treatment method, in consideration of variations in ground strength, a method is employed in which a solidified material is not injected at the time of penetration of a stirring blade, but is pulled up once in a state of being loosened by penetration. Therefore, as shown in FIG. 10, it is common to use the improved rod 1 in which the main injection hole 1U is attached to the uppermost stage of the stirring blade group 1w. In this case, a so-called unimproved portion A3 is formed between the uppermost blade 1w and the lowermost blade 1w, in which the solidified material is not mixed just by stirring. A countermeasure for eliminating the tip side unimproved portion A3 is one of the problems of the deep mixing method, and the following various countermeasures have been taken so far.
[0005]
(Prior art 1)
Prior art 1 attaches a solidified material injection dedicated pipe to the outside separately from the improved rod, and slides it up and down to switch the solidified material injection position, and to a portion between the uppermost blade and the lowermost blade. On the other hand, a solidified material is sprayed to form an improved body.
[0006]
(Prior art 2)
In Prior Art 2, an injection hole is provided near the stirring blade in the range between the uppermost blade and the lowermost blade, and the stirring blade portion can be swung several tens of degrees. The hole is opened and closed, and the opening / closing of the injection hole is switched according to the rotation direction of the blade by using the resistance force applied to the blade.
[0007]
(Prior art 3)
In prior art 3, a solidified material supply pipe is arranged in an improved rod pipe to form a double pipe structure, and an injection hole is formed in a range between the uppermost blade and the lowermost blade of the improved rod, and the uppermost portion of the rod is formed. The solidification material supply pipe, which is the inner pipe, is slid up and down by this cylinder to switch the injection hole communicating with it, and the solidification material is also applied to the part between the uppermost blade and the lowermost blade. This is to form an improved body by spraying.
[0008]
[Problems to be solved by the invention]
However, Prior Art 1 is applied to a marine construction machine having two or more agitating blades, and it is very difficult to apply it to land both structurally and operably. Further, the prior art 2 only expects the switching, and there is no method for confirming whether the switching is performed, and there is a problem that the switching may not be performed because the wings do not move due to the adhesion of the solidified material. . Further, in the prior art 3, it is possible to confirm whether or not the switching is performed by the stroke of the cylinder, but there is a problem in that the structure becomes very complicated.
[0009]
Therefore, the main problem of the present invention is that the ground has a simple structure and mechanism but can reliably switch the solidified material injection.Improved equipmentIs to provide.
[0010]
[Means for Solving the Problems]
The present invention that has solved the above problems is as described below.
<Invention according to claim 1>
An improved rod having a lower injection hole provided at a lower end portion, an upper injection hole provided at a distance above the lower injection hole, and a stirring blade provided in a range extending from the lower injection hole to the upper injection hole,
A switching device that is connected to the lower outlet and the upper outlet, respectively, and switches between supply of the powdered solidified material to the lower outlet and supply of the powdered solidified material to the upper outlet,
A ground improvement device, comprising: a pressurized supply device that supplies compressed air with a powder solidification material to the improved rod via the switching supply device.
Said switching device;
SaidPressure feederProvided with a supply port through which compressed air with a solidifying material is blown, a first outlet connected to the lower outlet, and a second outlet connected to the upper outlet. When,
One opening is connected to the supply port in the casing, and the other opening is movable to a connection position with the first outlet and a connection position with the second outlet. A switching pipe, a driving means for applying a moving force to the switching pipe,
In casingA compressed air supply device for supplying compressed air to the
Consisting of
A ground improvement device using a solidified material of a granular material, characterized in that:
[0011]
(Effect)
In the present invention, switching between the supply of the solidified material to the upper injection port and the supply of the solidified material to the lower injection port is performed by a switching device interposed in the solidified material supply path from the pressure feeding device to the improved rod. Therefore, the structure of the improved rod is very simple.
[0012]
Further, the switching device of the present invention is connected to the supply port into which the compressed air with the solidified material is blown, the first outlet connected to the lower outlet of the improved rod, and the upper outlet of the improved rod. One opening is connected to the supply port in the casing having the second outlet, and the other opening moves to a connection position with the first outlet and a connection position with the second outlet. By having a switching pipe made free, the other opening of the switching pipe is moved to a connection position with the first discharge port or a connection position with the second discharge port, so that the delivery path of the solidified material is changed. Switch. Therefore, since the structure and mechanism are very simple, very reliable switching is possible.
[0013]
At the time of this switching, in a state where the switching conduit is connected to one of the outlets, the other outlet communicates with the inside of the casing. For this reason, the granular material flows backward from the other outlet, and groundwater or soft soil flows backward from the corresponding injection port.OrHowever, in the present invention, theSupply device for supplying compressed air to, It is possible to prevent such a backflow.
[0014]
On the other hand, in the invention according to the first aspect, by utilizing such switching, in the process of inserting the improved rod, the lower outlet is separated from the lowermost end of the depth improvement range by a distance between the lower outlet and the upper outlet. After reaching the position above by minutes, the other opening of the switching line is thereafter connected only to the first outlet,Pressure feederRotary insertion of the improved rod is performed while injecting compressed air with the solidified material from the lower injection port only. Therefore, the above-mentioned unimproved portion on the distal end side can be eliminated.
[0015]
<Invention according to claim 2>
The improved rod is provided with a pair of conveying pipes, which are respectively communicated with the lower jetting port and the upper jetting port, and extend in a longitudinal direction of the rod to an upper end portion side by side,
These transport pipelines are connected to a first outlet and a second outlet of the switching device via a swivel device, respectively.
The swivel device has an upper fixed portion and a lower rotating portion airtightly and rotatably connected to a lower surface thereof,
The upper fixing portion of the swivel device has a pair of conduits, and the pair of conduits are connected to a first outlet and a second outlet of the switching device, respectively. And one of the conduits has a circular outlet gradually approaching the rotation center line of the lower rotation part toward the connection surface side with the lower rotation part, and coaxial with the rotation center line at the connection surface. The other conduit gradually deforms so as to surround the one conduit as it goes toward the connection surface side with the lower rotating part, and at the connection surface coaxially surrounds the circular outlet of the one conduit. Has an exit,
On the other hand, the lower rotating part of the swivel device has a pair of pipelines, and the pair of pipelines have side-by-side outlet portions connected to the pair of transport pipelines of the improved rod, respectively. One of the pipelines gradually approaches the rotation center line toward the connection surface side with the upper fixing portion, and has a circular inlet coaxial with the rotation center line at the connection surface, and the other pipeline has an upper portion. It has an annular inlet that deforms gradually toward the connecting surface side with the fixed part so as to surround the one conduit, and coaxially surrounds the circular inlet of the one conduit at the connecting surface,
A circular outlet and a circular inlet at the connection surface between the fixed part and the rotary part, and a circleAnnular outlet and annular inletThe respective ones are configured to be symmetrical about the connection surface and always communicated,
Claim1A ground improvement apparatus using the powdered solidification material according to the above.
[0016]
(Effect)
When switching the solidified material injection from the upper and lower injection ports by using the switching device as in the present invention, it is desirable to separately provide solidified material transport conduits for the upper and lower injection ports in the improved rod. In this case, if a pair of conveying pipes are provided side by side in the improved rod, the structure becomes very simple, the conveying resistance and the cross-sectional shape of both pipes can be made equal, and the solidified material is injected from the upper and lower injection ports in a well-balanced manner. It is preferable because it is possible.
[0017]
However, when the conveying pipes are arranged side by side, they also rotate with the rotation of the improvement rod, and the conveying pipe and the solidified material feeding and feeding device cannot be connected. For this reason, the conventional improved rod has a double pipe structure in which one of the inner pipe and the outer pipe is connected to the upper injection port and the other is connected to the lower injection port. However, the structure of the improved rod is complicated, and the inner pipe and outer pipe have different conveyance resistance and cross-sectional shape. Difficult to balance.
[0018]
On the other hand, in the present invention, in the solidified material transport path from the switching device to the upper and lower injection ports of the improved rod, only the connection surface portion of the swivel device has a double pipe structure, and the entrance portion and the exit side of the swivel device are not provided. Since the parts are arranged side by side, the conveying pipeline in the improved rod can be arranged side by side. In addition, since the pair of conduits in the swivel device gradually changes to a double-pipe shape as approaching the connection surface, there is also an advantage that the solidified material can pass smoothly without adhering and accumulating.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
<Regarding the ground improvement method and its equipment>
FIG. 1 schematically shows an example of a soil improvement device according to the present invention, which mainly includes an improved rod 1 inserted into the ground, a swivel device 4, a switching device 2, and a pressure-feeding supply device 3 for a powdered solidified material. Have been. The improved rod 1 has a lower injection hole 1b provided at a lower end portion, an upper injection hole 1u provided at a predetermined distance above the lower injection hole 1b, and an appropriate interval in a range from the lower injection hole 1b to the upper injection hole 1u. , Provided with a plurality of stirring blades 1w. Excavation bits 1a and 1c having appropriate shapes are provided at the lower end of the stirring blade 1w and the tip of the shaft, respectively.
[0020]
The switching device 2 includes a casing 2C as shown in FIG. As the casing 2C, a casing that can be completely sealed in a use state so that the pressure of the present invention can be maintained is used. Further, in the casing 2C, a supply port 2i is provided at the center of the upper part of one side wall and connected to the outlet side of the solidified material pressure feeding and supply device 3 via a pipe P1, and both lower sides of the other side wall are provided. A first outlet 2a and a second outlet 2b are connected side by side to the lower outlet 1b and the upper outlet 1u of the improved rod 1 via pipes P2 and P3, respectively. In addition, between these, one opening is connected to the supply port 2i, and the other opening is connected to the first outlet 2a (i.e., a communicating position; the same applies hereinafter) and the second outlet 2b. A switching pipeline 2P movably provided at each of the connection positions.
[0021]
In particular, in this example, the movement of the switching pipe 2P is performed by reciprocating drive of a cylinder 2S attached outside the case 2C as shown in FIG. That is, one opening of the switching pipe 2P is coaxially and rotatably connected to the supply port 2i, and the trajectory of the other opening of the switching pipe 2P due to this rotation is the first outlet 2a and The switching pipe 2P is bent so as to pass through the second outlet 2b, and the reciprocating driving force from the cylinder 2S attached to the outside of the case 2C is mechanically converted into a rotational force in the rotating direction of the switching pipe 2P. It is converted and transmitted to the switching pipeline 2P. Thus, the switching movement of the above-described switching pipeline 2P is possible.
[0022]
An inlet 2n for introducing compressed air such as compressed air is formed at an appropriate position in the casing 2C as a pressure holding means for maintaining the pressure in the casing 2C at a predetermined level or higher, and this inlet 2n is not shown. A compressed air supply device such as a compressor is connected. As the compressor, a compressor common to the solidified material pressure feeding / supplying device can be used.
[0023]
On the other hand, the more detailed structure of the improved rod 1 and the swivel device 4 are shown in FIGS. That is, as shown in FIG. 3, the improved rod 1 has a pair of conveying pipes 1p, 1p, which are communicated with the lower jet port 1b and the upper jet port 1u, respectively, and extend in the longitudinal direction of the rod to the upper end, side by side. The transfer pipes 1p, 1p are connected to the first and second outlets 2a, 2b of the switching device 2 via the swivel device 4, respectively. Although the transport pipelines 1p and 1p in the illustrated example are housed and protected in a protective tube 1T having a square cross section, the shape of the protective tube 1T can be an appropriate shape such as a circular cross section. Further, the protection cylinder 1T may be omitted.
[0024]
The swivel device 4 has an upper fixed portion 5 that does not rotate and a lower rotating portion 6 that is airtightly connected to the lower surface of the swivel device 4 so as to be rotatable around a vertical axis, similarly to the known device. However, the internal pipeline structure is completely different from the known one.
[0025]
That is, the upper fixing portion 5 of the swivel device 4 has a pair of conduits 7A and 7B, and the pair of conduits 7A and 7B are connected to the first outlet 2a and the second outlet 2b of the switching device 2. In addition, it has the input side parts 7i and 7n of the side-by-side arrangement respectively connected to it. One of the conduits 7B has a circular outlet 7x that gradually approaches the rotation center line of the lower rotation unit 6 toward the connection surface side with the lower rotation unit 6 and is coaxial with the rotation center line at the connection surface. The other pipeline 7A gradually deforms so as to surround the one pipeline 7B toward the connection surface side with the lower rotating portion, and coaxially surrounds the circular outlet 7x of the one pipeline 7B at the connection surface. It has an annular outlet 7e.
[0026]
On the other hand, the internal conduit of the lower rotating part 6 of the swivel device 4 is configured to be plane-symmetric with the upper fixed part 5. That is, the lower rotating part 6 has a pair of pipelines 8A and 8B, and the pair of pipelines 8A and 8B are arranged side by side connected to the pair of transport pipelines 1p and 1p of the improved rod, respectively. Along with the side portions 8e and 8x, one of the conduits 8B has a circular inlet 8n that gradually approaches the rotation center line toward the connection surface side with the upper fixing portion 5 and is coaxial with the rotation center line at the connection surface. The other pipeline 8A gradually deforms so as to surround the one pipeline 8B toward the connection surface side with the upper fixing portion 5, and coaxially connects the circular inlet 8n of the one pipeline 8B at the connection surface. It has an annular inlet 8i that surrounds it.
[0027]
In the swivel device 4 of the present invention, the circular outlet 7x and the circular inlet 8n on the connection surface between the upper fixed part 5 and the lower rotating part 6 and the circular outlet 7e andRingEach of the inlets 8i is configured to be symmetrical with respect to the connection surface and to be always in communication regardless of the rotation of the lower rotary unit 6.
[0028]
In this way, individual solidified material conveying paths which are always in communication with the upper and lower injection ports 1u and 1b of the rotating improved rod 1 are formed. Moreover, in the present invention, only the connecting surface portion in the swivel device 4 of the solidified material transfer path from the switching device 2 to the upper and lower injection ports 1u and 1b of the improved rod 1 has a double pipe structure, and the entrance side of the swivel device 4 Since the portion and the outgoing portion are arranged side by side, the conveying pipeline in the improved rod 1 can be arranged side by side. Therefore, the structure of the improved rod 1 can be simplified and the solidified material can be well-balanced. Further, the pair of pipes 7a, 7b, 8a, 8b in the swivel device 4 gradually changes into a double pipe shape as approaching the connection surface, so that the solidified material can pass smoothly without adhering / accumulating. There is also.
[0029]
Although not shown, in the improved rod 1 of this example, the solidified material injection ports 1u and 1b are provided only in the upper and lower portions, but as long as the upper and lower injection ports 1u and 1b are provided, the solidified material injection ports are further injected. A mouth can also be provided. In this case, the switching device 2 can also be configured so that the number of the outlets 2a and 2b can be further increased and the solidified material can be switched and supplied to three or more injection ports.
[0030]
On the other hand, when the ground improvement device thus configured is used, it is possible to perform the ground improvement without the front-side unimproved portion as shown in FIG. That is, first, as shown in FIGS. 9A to 9C, the lower injection port 1 b is used to rotate the improved rod 1 around its axis and cut and agitate the ground so that the lower jetting port 1 b is in the depth direction improved range in the ground to be improved. Insert until the lower end B is reached. At this time, as shown in FIG. 9A, if the lower injection port 1b reaches a position above the lowermost end B of the depth direction improvement range by a distance L between the lower injection port 1b and the upper injection port 1u. For example, thereafter, the other opening of the switching pipe 2P in the switching device 2 is connected only to the first outlet 2a (see FIG. 1; a state shown by a solid line in FIG. 1).Pressure feederRotary insertion of the improved rod is performed while injecting the compressed air accompanied by the solidified material from 3 only from the lower injection port 1b. Therefore, as shown in FIGS. 9B and 9C, it is possible to perform the solidified material injection to the lower end B of the stirring range and the stirring and mixing with the current position soil. In FIG. 9, the improved area at the time of rod insertion is indicated by reference numeral A1.
[0031]
After the improvement rod 1 has been inserted to the lower end B of the improvement range, the improvement rod 1 is then pulled up to the upper end (not shown) of the improvement range. In this case, as shown in FIGS. 9C to 9E, the other opening of the switching pipe 2P in the switching device 2 is connected only to the second outlet 2b (see FIG. 1; FIG. Switch to the state shown by the dotted line.)Pressure feederThe improved rod 1 is rotated and pulled up while injecting the compressed air accompanied by the solidified material from 3 only from the upper injection port 1u. Thus, the improvement is also made in the pull-up improvement area A2 above the rod insertion improvement area A1, and an improved body can be formed over the entire stirring portion. Since the improved area A1 at the time of inserting the rod is re-stirred by the pulling-up rotation of the improved rod 1, stirring and mixing are performed to the same extent as the improved area A2 at the time of pulling up, and a uniform body is formed in the depth direction. When the upper and lower injection ports 1u and 1b are switched, the solidified material conveying path for one of the injection ports communicates with the inside of the casing 2C of the switching device 2, so that the solidified material conveying path to the corresponding injection port is provided. Therefore, there is a possibility that the granular material, the groundwater, and the soft soil flow backward. However, such a backflow can be prevented by appropriately maintaining the internal pressure of the casing by a pressure holding means for maintaining the pressure in the casing 2C at a predetermined level or more. It is possible. Although the internal pressure of the casing 2C can be determined as appropriate, it is preferable that the internal pressure be equal to or higher than the pressure of the solidified material.
[0032]
<Regarding the granular material feeding and supply device>
Next, it can be suitably used in the above ground improvement method and apparatus.Powder pressure feederWill be described in detail.
FIG. 11 and FIG.Powder pressure feederOf the first embodiment is shown. The powder material supply apparatus mainly includes a powder metering means 10, a first opening / closing valve 20, an intermediate chamber 30, a second opening / closing valve 40, a pressure feeding chamber 50, a sending means 60, and a low level detecting means 51. It is composed of
[0033]
The powder material supply means 10 includes a storage chamber 11 having a powder material supply port 11i at an upper portion and a discharge port 11x at a lower end portion, and a powder material supply port provided in the storage chamber 11 from outside. Container 12 configured to receive and store the powder and granules, and to discharge the stored powder and granules to the outside, and a load cell 13 as a measuring means for measuring the amount of the powder and granules in the measurement container 12. , 13. As can be understood from this configuration,thisThe apparatus supplies the granular material to the upper granular material supply port 11i of the granular material supply means 10 from, for example, a large storage tank (not shown) such as a silo provided with a supply opening / closing device on the outlet side. Is assumed.
[0034]
In particular, in the first embodiment, the exhaust filter 14 communicates with the upper part of the storage chamber 11. The measuring container 12 has a shape with an open upper surface, and one end of each of the rotating shafts 15, 15 is connected to both side surfaces, and the other end of each of the rotating shafts 15, 15 is connected to a rotating drive source such as a motor. The rotation driving sources 16 are fixed to the inner side plates 17 suspended from the inner surface of the top plate 11u of the storage chamber 11 via the load cells 13, 13, respectively. I have. Therefore, the weighing container 12 is suspended in the storage chamber 11 via the load cells 13, 13, and the amount of the powder or granular material inside can be measured by the load cells 13, 13. Then, the stored powder particles inside can be discharged. The state after the inversion is shown by a dotted line.
[0035]
An intermediate chamber 30 is connected to a lower end outlet 11x of the storage chamber 11 via a first on-off valve 20. The lower chamber outlet 30x of the intermediate chamber 30 is pressure-fed via a second on-off valve 40. The chamber 50 is connected. Each of the on-off valves 20 and 40 is provided with rotary shafts 22 and 42 extending in the horizontal transverse direction in the pipelines 21 and 41 as shown in the figure, and the rotary shafts 22 and 42 have a plate-like shape capable of closing the pipeline 21. It is possible to use a valve in which the valve bodies 23 and 43 are attached and the rotary drive sources 24 and 44 for the rotary shafts 22 and 32 are provided outside the pipeline. In the illustrated example, the reciprocating driving force of the cylinders 25 and 45 is mechanically converted into the rotation direction of the rotating shafts 22 and 32 and transmitted to the rotating shafts 22 and 42. On the other hand, since each of the chambers 11, 30, and 50 transports the granular material by its own weight, it is preferable to use a cylindrical body whose inner diameter decreases toward the lower end as shown in the figure.
[0036]
In particular, a low-level sensor 51 is provided at a predetermined height position in the pumping chamber 50, and the low-level sensor 51 detects a low-level state in which the amount of powder in the pumping chamber 50 has not reached a predetermined amount. It can be detected. The height position of the low-level sensor is, for example, between the time when the low-level state is detected and the time when the granular material is replenished in the pumping chamber 50, so that the external delivery means 60 can supply the granular material continuously and quantitatively. The height position corresponds to a sufficient amount of the granular material.
[0037]
Further, the pressure feeding chamber 50 is provided with a feeding means 60 for continuously taking out a predetermined amount of the powder and granules stored in the inside thereof, and putting the powder and granules out to the outside with the pressurized air.
[0038]
For example, as shown in the figure, the external sending means 60 is provided with a rotor case portion 61 continuous from the lower end portion of the pressure feeding chamber 50 and a rotor 62 internally and continuously driven to rotate in a predetermined direction. The rotary feeder can be constituted by a continuous quantitative supply type rotary feeder, and a delivery unit for sending the powder and granules cut out by the rotary feeder on the compressed air from a compressed air supply source such as a compressor (not shown). The rotor 62 is rotatable around a horizontal (or horizontal) rotation shaft 63, and a large number of radially protruding partition blades 64 are formed on the outer peripheral surface of the rotation shaft 63 at equal intervals in the circumferential direction. A space between the blade portions 64 is formed as a pocket 65. The rotating shaft 63 is connected to a rotation drive source such as a motor (not shown) connected to the outside of the case portion 61, and the rotor 62 is configured to be rotated by the rotation drive source.of courseAlternatively, a rotor having another known shape may be used. As the delivery section, as shown in the drawing, a powder material outlet 66 is formed at the lower end of a side surface of the rotor case 61 that is orthogonal to the direction of the rotation axis 63 of the rotor 62, and the lower end of the side surface opposite to this is formed at the lower end. It is possible to adopt a configuration in which a compressed air inlet 67 from a compressed air supply source is formed, and the compressed air from the compressed air inlet 67 flows to the powder material outlet 66 via the pocket 65 at a position corresponding thereto.
[0039]
In addition, as shown in FIGS. 6 to 8 and FIGS. 9 to 11 of Japanese Patent Application No. 2001-233135, a plurality of types are used, such as those using a screw feeder described in JP-A-8-113370. Can be continuously supplied to the external delivery path.
[0040]
On the other hand, in the above-described first embodiment, the amount of the granular material in the measuring container 12 can be measured by supporting the measuring container 12 with respect to the storage chamber via the load cell. As shown in FIGS. 13 and 14, the entirety of the granular material metering / supplying means 10 is suspended and supported on a gantry 70 (only part of which is shown) via a load cell 13, and the weight of the apparatus is subtracted from the weighing container. It may be configured to be able to measure the amount of the powder and granules in 12. In this case, the storage chamber 11 of the powder and granular material supply means 10 and the first opening / closing valve 20 are connected by a flexible joint (for example, a bellows pipe made of resin such as rubber) 80 which can expand and contract in the vertical direction. The portion below the on-off valve 20 is separately fixed to the gantry 70. Further, in this case, as shown in the figure, the rotating shaft 15 of the measuring container is communicated with the outside of the storage chamber, and is connected to the rotary drive source 16 fixed to the outer peripheral surface of the storage chamber 11, so that the internal side plate 17 can be omitted.
[0041]
Further, in the first embodiment, the measuring container 11 is configured to discharge the stored powder particles by inversion. However, as in the third embodiment shown in FIG. 15 and the fourth embodiment shown in FIG. A hopper-shaped weighing container 90 in which the entire upper surface is a powder / particle receiving opening 91, and a powder / particle discharge port 92 is formed at the lower end, and an opening / closing valve is provided at the lower end discharge port 92. You can also. As shown in the figure, the opening / closing valve is configured such that the weight-shaped valve element 93 fitted into the discharge port from below and the weight-shaped valve element 93 fixed to the top plate 11u are moved up and down so as to be fitted to and removed from the discharge port 92. And a cylinder 94. In addition, the third embodiment and the fourth embodiment differ in how the measuring container 12 is suspended, and the former corresponds to the first embodiment in that the measuring container 12 is supported on the storage chamber via the load cell 13. The latter employs a powder and granule weighing structure. The latter suspends and supports the whole of the powder and granule weighing / supplying means 10 with respect to a gantry 70 via a load cell 13, and stores the powder / particle weighing / supplying means 10 in a storage chamber 11. The first embodiment employs a powder / particle measurement configuration corresponding to the second embodiment in that the first on-off valve 20 and the first on-off valve 20 are connected by a flexible joint 80.
[0042]
On the other hand, thus constitutedPowder pressure feeder17 is as shown in FIG. Although FIG. 17 typically shows the case of the device of the third embodiment, the same applies to the case of the device of another embodiment.
[0043]
(When the device starts)
At the start of the apparatus, first, the external feeding means 60 does not perform the external feeding, that is, at least the rotary feeder is stopped, and each of the pressure feeding chamber 50, the intermediate chamber 30, and the measuring container 11 stores a predetermined amount of the granular material. (Not shown).
[0044]
For this purpose, first, the granular material is charged and supplied from an external large storage tank such as a silo to the measuring container 90 via the supply port 11i. At this time, the amount of the granular material in the measuring container 90 is measured by the load cell 13, and when the amount reaches a predetermined amount, the supply from the outside is automatically stopped. When the weighing is completed, the on-off valve of the weighing container 90 is opened to discharge the powder inside the storage chamber 11, and the first on-off valve 20 and the second on-off valve 30 are opened and closed as appropriate, so that the intermediate The granular material is fed to the chamber 30 or the pumping chamber 50. If necessary, the supply of the granular material from the external storage tank can be performed a plurality of times. When the pressure feeding chamber 50, the intermediate chamber 30, and the measuring container 90 have already stored a predetermined amount of the powdery material, it is not necessary to perform the operation at the time of starting the apparatus.
[0045]
(During external supply of powder and granules)
During the supply operation of the powder and granules to the outside, the external sending means 60 is always operated to perform the continuous fixed amount sending to the outside. More specifically, as shown in FIG. 18, the rotor 62 of the rotary feeder is continuously rotated in a predetermined direction, and the granular materials P3 stored in the pumping chamber 50 are sequentially received in the pockets 65 of the rotor 62. As the rotor 62 rotates, it is transferred to the outlet 66 side. On the other hand, compressed air from a compressed air supply source (not shown) is introduced into the pocket 65 communicating with the compressed air inlet 67. As a result, when the pocket 65 does not communicate with the pumping chamber 50 and communicates with the outlet 66 at the lower end, the powder P4 received in the pocket 65 is put on the compressed air passing through the pocket 65 and the outlet P4. It is sent to the outside via 66. Most of the compressed air is sent out together with the powder, but the rotor pocket 65 after the powder is sent out is circulated to the pumping chamber side by the rotation of the rotor 62. It slightly leaks into the pumping chamber 50.
[0046]
By the external delivery, the storage amount of the granular material P3 in the pumping chamber 50 is reduced as shown in FIG. 17A, and when the low level state is detected by the low level detecting means 51, FIG. As shown, the second on-off valve 40 is opened for a predetermined time while the first on-off valve 20 is closed, and the powder stored in the intermediate chamber 30 is dropped and supplied to the pressure feeding chamber 50. At this time, part of the compressed air leaking into the pressure feeding chamber 50 slightly leaks into the intermediate chamber 30.
[0047]
When the opening and closing operation of the second opening and closing valve 40 is performed, as shown in FIG. 17C, in this example, the first opening and closing valve 20 is operated for a predetermined time in a state where the second opening and closing valve 40 is closed. After being opened, the compressed air in the intermediate chamber 30 is sent into the storage chamber 11 and exhausted to the outside of the apparatus via the exhaust filter 14. At this time, since the granular material P1 in the storage chamber 11 is stored in the measuring container 90, the compressed air passing through the storage chamber 11 hardly acts. Therefore,ThisIn the apparatus described above, the pressure air is appropriately exhausted, and a situation in which the granular material flows backward hardly occurs.
[0048]
Next, as shown in FIG. 17D, with the second on-off valve 40 closed, the first on-off valve 20 is opened, and the weighed powder and granules stored in the weighing container 90 are discharged, and the An intermediate chamber replenishing operation for supplying to the chamber 30 is performed. Subsequently, as shown in FIG. 17 (e), in a state where the first on-off valve 20 is closed, the reception of the powder and granules from the outside into the weighing container 90 is started, and the weighing is performed by the load cell 13. A predetermined amount of the granular material is received in the container 90 (a measuring container supply operation). These replenishing operations may be alternately repeated a plurality of times, if necessary, if the amount of replenishment at one time is designed to be small.
[0049]
Therefore, in this case, the volume, low-level position, replenishing amount, and the like of the pumping chamber 50 are appropriately designed so that the replenishment to the intermediate chamber 30 is completed before the powder in the pumping chamber 50 reaches the low level. I do. In other words, the point at which the shortest time of supply to the intermediate chamber 30 is equal to the time required for the stored amount of the pumping chamber 50 to reach a low level is the maximum pumping capability of this apparatus. However, in this measuring container supply operation, it is sufficient that at least the first on-off valve 20 is closed. Therefore, when the storage amount of the pressure-feeding chamber 50 becomes low (or becomes low) during this operation, at the same time, The second opening / closing valve 40 can be opened to perform the pressure feeding chamber supply operation.
[0050]
Thus, during the external pumping of the granules, a predetermined amount of the granules is always stored in the intermediate chamber 30 and the measuring container 90, and the granules are supplied stepwise to the pumping chamber 50 as necessary. Is done. Hereinafter, this is repeated.
[0051]
And it was configured like thisPowder pressure feederHas the following advantages.
(A) Since the powder is fed by pressure through the measuring container 90 (indicated by the reference numeral 12 in the first and second embodiments) and the measuring means 13, the management record of the amount of the powder used can be easily and easily recorded. Can be done accurately.
(B) Since there is no need to store a large amount of powder and granules in the device, the size of the device can be reduced. Even in such a case, there is no practical problem since a large storage device for storing the powder and granules is used except in the case of small-scale construction.
(C) With the appropriate valve opening / closing timing according to the above procedure, the compressed air in the apparatus is appropriately exhausted, and the backflow of the granular material is unlikely to occur.
(D) Since the solidified material supply path is merely blocked at intervals by the two on-off valves 20, 40, the structure is very simple, and maintenance such as internal cleaning is also very easy.
[0052]
【The invention's effect】
As described above, the ground improvement of the present inventionapparatusIn this case, there is an advantage that the solidified material injection can be reliably switched in spite of the simple structure and mechanism.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a ground improvement method and apparatus of the present invention, and in particular, a cross section of a switching device.
FIG. 2 is a longitudinal sectional view of the switching device of the present invention.
FIG. 3 is a partially cutaway view showing an example of a suitable ground improvement rod.
FIG. 4 is an enlarged view of a portion A in FIG. 3;
FIG. 5 is a sectional view taken along line BB of FIG. 3;
FIG. 6 is an enlarged view of a portion C in FIG. 3;
FIG. 7 is an enlarged view of a portion D in FIG. 3;
FIG. 8 is an enlarged view of a portion E in FIG. 3;
FIG. 9 is a view showing a construction procedure of the ground improvement method of the present invention.
FIG. 10 is a view showing a construction procedure of a conventional ground improvement method.
FIG. 11 is a longitudinal sectional view of a first embodiment of the granular material feeding and supplying device.
FIG. 12 is a longitudinal sectional view of the first embodiment viewed from another direction.
FIG. 13 is a vertical cross-sectional view of a second embodiment of the granular material pressure feeding apparatus.
FIG. 14 is a longitudinal sectional view of the second embodiment viewed from another direction.
FIG. 15 is a longitudinal sectional view of a third embodiment of the powder and granular material feeding / supplying device.
FIG. 16 is a longitudinal sectional view of a fourth embodiment of the granular material feeding and supplying device.
FIG. 17 is a diagram showing an operation procedure of the powder and granular material feeding / supplying apparatus.
FIG. 18 is an enlarged view of a main part showing an operation procedure of the granular material pressure feeding device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Improvement rod, 2 ... Switching device, 3 ... Powder / solidification material press-feeding / supplying device, 4 ... Swivel device, 10 ... Powder / grain weighing supply means, 11 ... Storage chamber, 12 ... Measuring container, 13 ... Load cell, 14 ... exhaust filter, 20 ... first on-off valve, 30 ... intermediate chamber, 40 ... second on-off valve, 50 ... pumping chamber, 51 ... low level detection means, 60 ... external sending means.

Claims (2)

An improved rod having a lower injection hole provided at a lower end portion, an upper injection hole provided at a distance above the lower injection hole, and a stirring blade provided in a range extending from the lower injection hole to the upper injection hole,
A switching device that is connected to the lower outlet and the upper outlet, respectively, and switches between supply of the powdered solidified material to the lower outlet and supply of the powdered solidified material to the upper outlet,
A ground improvement device, comprising: a pressurized supply device that supplies compressed air with a powder solidification material to the improved rod via the switching supply device.
Said switching device;
A supply port through which compressed air with a solidified material is blown from the pressure supply device , a first outlet connected to the lower outlet, and a second outlet connected to the upper outlet. With the casing provided respectively,
One opening is connected to the supply port in the casing, and the other opening is movable to a connection position with the first outlet and a connection position with the second outlet. A switching pipe, a driving means for applying a moving force to the switching pipe,
A compressed air supply device for supplying compressed air into the casing ;
Consisting of
A ground improvement device using a solidified material of a granular material, characterized in that: The improved rod is provided with a pair of conveying pipes, which are respectively communicated with the lower jetting port and the upper jetting port, and extend in a longitudinal direction of the rod to an upper end portion side by side,
These transport pipelines are connected to a first outlet and a second outlet of the switching device via a swivel device, respectively.
The swivel device has an upper fixed portion, a lower rotating portion airtightly connected to the lower surface thereof and rotatably connected around a vertical axis,
The upper fixing portion of the swivel device has a pair of conduits, and the pair of conduits are connected to a first outlet and a second outlet of the switching device, respectively. And one of the conduits has a circular outlet gradually approaching the rotation center line of the lower rotation part toward the connection surface side with the lower rotation part, and coaxial with the rotation center line at the connection surface. The other conduit gradually deforms so as to surround the one conduit as it goes toward the connection surface side with the lower rotating part, and at the connection surface coaxially surrounds the circular outlet of the one conduit. Has an exit,
On the other hand, the lower rotating part of the swivel device has a pair of pipelines, and the pair of pipelines have side-by-side outlet portions connected to the pair of transport pipelines of the improved rod, respectively. One of the pipelines gradually approaches the rotation center line as it goes toward the connection surface side with the upper fixing portion, and has a circular inlet coaxial with the rotation center line at the connection surface, and the other pipeline has an upper portion. It has an annular inlet that deforms gradually toward the connecting surface side with the fixed part so as to surround the one conduit, and coaxially surrounds the circular inlet of the one conduit at the connecting surface,
The circular outlet and the circular inlet and the annular outlet and the annular inlet at the connection surface between the fixed portion and the rotating portion are configured so as to be symmetrical with respect to the connection surface and always communicate with each other,
A ground improvement device using the solidified powder material according to claim 1 .

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