JP2004036342A - Placing device for in-pipe mixing solidifying processing soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a placing device for increasing a de-energizing effect of a de-energizing cyclone, preventing deterioration in quality by separation of a material, easily coping with a change in the depth of water by vertically driving a tremie pipe, holding the inside of the tremie pipe in a full pipe state by mixing solidifying processing soil, flowing down/delivering the mixing solidifying processing soil in the full pipe state, preventing a backflow of outside water, and performing a displacement method for high grade improved soil in an in-pipe mixing solidifying processing construction method for reclamation work of a harbor. <P>SOLUTION: Initial de-energization is performed by an impact dispersing blade of a projecting part of an inside surface of the de-energizing cyclone 11. The de-energizing effect is increased by forming a mud reservoir simultaneously when performing the final de-energization by a partition plate of a bottom part. The tremie pipe 12 is vertically rotatably arranged on a de-energizing cyclone bottom part side surface via a horizontal discharge pipe, a swivel joint and a connecting bent pipe, and can be vertically driven, and the driving length is changed according to the depth of water by pulling-up of the tremie pipe and attachment-detachment of a divided pipe 12a. A flap valve 50 for automatically opening-closing by a counterweight is arranged on the tip of the tremie pipe 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is to dispose of a mixed solidified treated soil in a pipe obtained by a mixed solidified pipe treatment method in a pipe in which a solidified material is added to soft dredged soil in a landfill work such as a harbor and recycled for use as a landfill material. The present invention relates to a driving device for performing the driving.
[0002]
[Prior art]
The in-pipe mixing and solidification treatment method is to add solidification material when unloading the grab dredged dredged soil by an air pressure ship and use the turbulence effect of the plug flow generated in the pumping pipe to make the dredged soil and solidified material Are mixed with stirring. A deenergizing cyclone is installed at the final end of the pumping pipe to reduce the discharge pressure of air pneumatic feeding, and while the dredged soil and the solidified material are sufficiently kneaded, the mixed solidified soil in the pipe is depressurized and the carrier air After the separation, it is poured into a predetermined disposal site.
[0003]
When casting underwater according to the purpose of construction and construction conditions, the method is roughly classified into two methods. As shown in Fig. 11 (a) (example of landfill construction and aerial casting) And a "falling-over flow method" in which the mixed and solidified treated soil M in the pipe is allowed to flow naturally along the slope, as shown in FIG. 11 (b). As shown in Example 2), a “submerged tremy casting method” in which a deenergizing cyclone 101 is mounted on a casting vessel 100, and a tremy pipe 102 is connected to the outlet thereof to cast the mixed solidified treated soil M in the pipe. is there.
[0004]
The "shoulder flow method" can be constructed with simple equipment and is economically advantageous. However, when the slope is long, the mixed solidified treated soil M that has not solidified, that is, the improved soil flows down the long slope. By doing so, there is a risk that the improved soil will be separated and become muddy, thus impairing the quality.
[0005]
On the other hand, the "underwater tremy casting method" requires large-scale equipment and construction costs are high, but there is no underwater movement of only the improved soil, and it is driven through a tremy pipe, so high quality improved soil is specified. Can be cast in the position.
[0006]
[Problems to be solved by the invention]
In the above-mentioned conventional "underwater tremy casting method", the tremy tube 102 is almost directly connected to the lower part of the energy-reducing cyclone 101, and although the energy is reduced by the cyclone, the blowing pressure of the improved soil remains, It flows down while rotating in the pipe. For this reason, the water in the tremy pipe submerged in the sea and the improved soil are agitated, causing material separation, and the quality has been significantly reduced.
[0007]
In addition, the method of mounting the tremee pipe in the conventional method includes: (1) a method of directly connecting the energy-reducing cyclone and the tremee pipe to the end of the casting vessel, and (2) a vertical direction as shown in FIG. A method of directly connecting the energy-saving cyclone 101 to the tip of a rudder (overhanging portion) 103 that can be tilted to a third direction. (3) As shown in FIG. 12 (b), a chute 105 is provided at the outlet of the energy-saving cyclone 101 via a rubber sleeve 104. And a method in which the chute 105 is hung down around a pin connecting member disposed outside the rubber sleeve 104 as a rotation center (Japanese Patent Laid-Open No. 2000-129652).
[0008]
However, the conventional method (1) cannot cope with a change in water depth. In the conventional method of (2), when the ladder 103 is raised to follow a change in water depth, the tremee pipe 102 becomes oblique, an uneven load is generated at the tremee pipe and the tip of the ladder, and the trajectory can naturally follow the change in water depth. Is limited. In the conventional method (3), the bending angle of the rubber sleeve 104 is limited, and it is difficult to set the chute 105 vertically. In this method, the range in which the change in the water depth can be followed is also limited.
[0009]
As for the tremie pipe, as shown in FIG. 12 (c), there is a telescoping variable type in which a hydraulic jack 111 is attached to a telescope-type tremie pipe 110 and the length can be arbitrarily adjusted according to the water depth. There are problems that the structure of the tremy tube device becomes complicated, and that the cost and maintenance cost of the hydraulic device increase.
[0010]
Further, in the above-mentioned Japanese Patent Application Laid-Open No. 2000-129652, as shown in FIG. 12B, an opening / closing lid 106 is provided at the tip of the chute 105 and the opening / closing lid 106 is opened by the opening / closing cylinder 107 to reduce the energy. Although it is described that the storage-improved soil in the cyclone 101 is continuously and evenly landfilled at a fixed amount in a landfill site, the cost and maintenance cost of the hydraulic device also increase, and the When the cover is automatically opened and closed, there are problems such as complicated control and high cost.
[0011]
The present invention has been made in order to solve the above-described problems, and in a pipe solidification treatment method in which a solidifying material is added to soft dredged soil in a landfilling work in a harbor or the like, and the solidified material is recycled as a landfill material. In addition, it can increase the deenergizing effect of the deenergizing cyclone at the tip of the pumping pipe, prevent the quality from deteriorating due to material separation, and enable the vertical installation of the tremy pipe and easy change in water depth Can be improved, quality can be improved, and furthermore, the inside of the tremie pipe can be maintained in a full state with the mixed and solidified treated soil, and the mixed and solidified treated soil can flow down and be discharged in the fully filled state, and It is another object of the present invention to provide an apparatus for setting and mixing a solidified and treated soil in a pipe, which can prevent backflow of external water and can implement a high-grade improved soil replacement method.
[0012]
[Means for Solving the Problems]
A first aspect of the present invention is to provide a pressure-reducing device provided at the tip of the pressure-feeding pipe by mixing the dredged soil and solidified material (such as cement milk) in the pressure-feeding pipe while pneumatically transporting the dredged soil through the pressure-feeding pipe. It is a casting device that separates the carrier air from the mixed and solidified treated soil consisting of dredged soil and solidified material with a so-called energy reduction cyclone, and casts the mixed and solidified treated soil into the disposal site from the lower discharge port of the energy reducing separator. A lower discharge port of the deenergization separator is provided on a lower side surface of the deenergization separator, and a partition that divides a bottom space into a lower discharge port side discharge space and a non-lower discharge port side storage space on a bottom plate of the deenergization separator. It is an apparatus for placing and solidifying a mixed and solidified soil in a pipe, provided with a plate.
[0013]
According to a second aspect of the present invention, in the casting apparatus according to the first aspect, a convex portion (an impact distribution blade made of a steel material such as an angle material) extending vertically is provided on an inner surface of the deenergizing / separating device. A device for placing mixed and solidified treated soil, which is arranged at intervals in the direction.
[0014]
According to a third aspect of the present invention, in the casting apparatus according to the first or second aspect, the bottom plate of the deenergizing / separating device is an inclined plate having a downward slope toward the lower discharge port. This is a device for placing medium mixed solidified soil.
[0015]
According to a fourth aspect of the present invention, in the casting device according to the first, second or third aspect, a horizontal discharge pipe is connected to the lower discharge port, and the mixing and solidification in the pipe is performed. It is a device for placing treated soil.
[0016]
Claims 1 to 4 relate to the invention relating to the energy dissipating cyclone, which is applied to the "underwater tremy casting method", but can also be applied to the "floor downflow method". In the former case, the deenergized cyclone is mounted on a casting vessel, and the mixed solidified soil in the deenergized cyclone is submerged through a tremy tube. In the latter case, the deenergized cyclone is installed on land, and the mixed solidified treated soil in the deenergized cyclone is directly poured into the air. In order to increase the deenergizing effect of the deenergizing cyclone, (1) a partition plate is provided at the bottom of the deenergizing cyclone (Claim 1). Dispersion blades are provided (Claim 2). (3) If necessary, a horizontal discharge pipe is provided at the lower discharge port of the deenergizing cyclone (Claim 4). Further, the bottom plate of the deenergization separator is an inclined plate having a downward slope toward the lower discharge port (claim 3), so that the mixed and solidified soil passes through the partition plate and is discharged from the lower discharge port.
[0017]
While the mixed solidified soil thrown into the deenergized cyclone by the pressure feed pipe is swirled along the wall surface, it is deenergized, and at the same time, the carrier air is centrifuged outside and inside due to the difference in specific gravity. The mixed solidified soil is discharged from the exhaust pipe at the upper center of the deenergizing cyclone to the outside. At the same time, the final deenergization is achieved by the partition plate at the bottom of the deenergization cyclone, and at the same time, the storage space on the side opposite to the lower discharge port becomes muddy and forms a buffer area. The mixed solidified soil in this storage space overflows the partition plate and is discharged from the lower discharge port. Due to the impact dispersion blades and the bottom partition plate formed by these convex portions, the energy dissipation effect is increased as compared with the conventional energy dissipation cyclone. In the case of the tremy pipe method, the blow-out pressure of the mixed solidified soil remains as in the past and flows down while rotating inside the tremy pipe, and the mixed solidified soil and water are agitated, so that material separation does not occur, and air blow is performed. The quality equivalent to that of the equipment can be secured. Furthermore, by providing a horizontal portion with a horizontal discharge pipe at the draw-out portion of the mixed solidified treated soil at the bottom of the deenergized cyclone, a deenergizing effect can be obtained, and a stable flow of the mixed solidified treated soil can be achieved.
[0018]
According to a fifth aspect of the present invention, the dredged soil and the solidified material (such as cement milk) are mixed in the pumping pipe while the dredged soil is pneumatically conveyed by the pumping pipe, provided at the tip of the pumping pipe, and installed on the barge. The carrier air is separated from the mixed solidified treated soil consisting of dredged soil and solidified material by the energy-reducing separator (so-called energy-reducing cyclone), and the mixed solidified soil is discharged from the tremie pipe connected to the lower discharge port of the energy-reducing separator. This is a casting device that is installed at the disposal site.The lower discharge port of the deenergization separator is provided on the lower side surface of the deenergization separator, and a horizontal discharge pipe is connected to this lower discharge port and the horizontal discharge pipe rotates. A connection setting pipe (elbow) is connected via a universal pipe joint (swivel joint), and a tremy pipe is connected to the connection bending pipe.
[0019]
According to a sixth aspect of the present invention, there is provided the casting apparatus according to the fifth aspect, wherein the tremy pipe is constituted by a divided pipe having a predetermined length. is there.
[0020]
Claims 5 and 6 are inventions relating to a deenergized cyclone and a tremy tube applied to the "underwater tremy casting method". To be able to follow the change in water depth, (1) one end of the connecting curved pipe is rotatably supported by a swivel joint on the horizontal discharge pipe on the bottom side of the deenergizing cyclone, and the curved part of the connecting curved pipe is supported by a horizontal rotating shaft and a bearing. The tremy tube can be rotated vertically by using the center axis of the horizontal discharge tube as the rotation axis, and the tip of the tremy tube is raised and lowered by a winch and a wire rope method, so that the tremy tube can be rotated vertically. And a horizontal storage state of storing horizontally on a barge (claim 5). The tremy tube may be slightly pulled up from a vertically driven state and may be driven in an inclined state. {Circle around (2)} The tremy pipe is divided into a plurality of parts, and the divided pipes are detachably connected by a flange joint or the like, and the length of the tremy pipe (casting length) is changed depending on the water depth (claim 6).
[0021]
According to the fifth and sixth aspects of the present invention, the tremy tube is rotatably provided up and down via the horizontal discharge pipe, the swivel joint, and the connection curved pipe on the bottom side surface of the energy-reducing cyclone, so that the vertical driving can be performed. By pulling up the tremy pipe or adding and removing the split pipe, the casting length can be changed according to the water depth, which enables good casting work, good workability and fine control. And the quality can be improved. In addition, compared to a conventional telescopic tremie tube and a telescopic variable type using a hydraulic jack, it is possible to follow a change in water depth with a simple and low-cost device.
[0022]
According to a seventh aspect of the present invention, the dredged soil and the solidified material (such as cement milk) are mixed in the pipe while the pulverized soil is pneumatically conveyed by the pressure feeding pipe, provided at the tip of the pressure feeding pipe, and installed on the barge. The carrier air is separated from the mixed solidified treated soil consisting of dredged soil and solidified material by the deenergized separator (so-called deenergized cyclone), and the mixed solidified treated soil is removed from the tremie pipe connected to the lower discharge port of the deenergized separator. It is a casting device to be placed at the disposal site, and at the tip of the tremy pipe, the tip discharge port is normally closed by a predetermined closing pressure, and the weight of the mixed solidified treated soil in the deenergizing separation device and the tremy pipe is as described above. A filing valve for automatically opening a tip discharge port when a closing pressure is exceeded is provided.
[0023]
According to an eighth aspect of the present invention, in the driving device according to the seventh aspect, one end of the flap valve is pivotally supported by one end of the tip discharge port of the tremy tube, and a towed wire is attached to the other end of the flap valve. One end of a wire rope or the like is connected, and the other end of the towed rope is connected to a counterweight installed on the barge, and the counterweight applies a closing pressure to the flap valve. It is a device for placing a mixed and solidified soil in a pipe characterized by the following features.
[0024]
According to a ninth aspect of the present invention, in the driving device according to the eighth aspect, a hoist (an electric winch or the like) that lifts a counterweight and releases a closing pressure is provided on the barge. This is a device for placing mixed solidified soil in pipes.
[0025]
According to a tenth aspect of the present invention, in the casting device according to the seventh or eighth aspect, the tremy tube is provided with an air ejection nozzle for ejecting compressed air into the tremy tube. This is a device for placing medium mixed solidified soil.
[0026]
Claims 7 to 10 also relate to an invention relating to a deenergized cyclone and a tremy tube applied to the "underwater tremy casting method". To fill the inside of the tremy pipe with the mixed and solidified treated soil, and to prevent external water from flowing back, (1) install a flap valve at the tip of the tremy pipe, close the flap valve with a counterweight on the barge, etc. In addition to preventing backflow of the external water, the tremy pipe always contains only the mixed solidified soil, and the flap valve automatically turns on when the weight of the decondensing cyclone and the mixed solidified soil in the tremy pipe exceeds the closing pressure of the flap valve due to the counterweight, etc. The mixed and solidified treated soil is opened so as to be discharged (claim 7). {Circle around (2)} The mechanism for applying the closing pressure to the flap valve is a counterweight device using a counterweight on the barge and a wire rope or the like that pulls and closes the flap valve with the counterweight. The counterweight is constituted by a plurality of divided weights, and has a structure capable of changing the closing pressure of the flap valve, and changes the load due to the pipe frictional resistance of the mixed and solidified treated soil. {Circle around (3)} When it is desired to immediately reduce the closing pressure by the counterweight to zero, the electric winch or the like is pulled up by the counterweight (claim 9). {Circle around (4)} When the tremy tube is slightly blocked, compressed air is injected into the tube from an air ejection nozzle attached to the tremy tube to release the blocked state (claim 10).
[0027]
According to the present invention, a flap valve that automatically opens and closes is provided at the tip of the tremy tube, so that the inside of the tremy tube is kept full with the mixed solidified treated soil, and the mixed solidified treated soil is filled with the mixed solidified treated soil. Can be flowed down and discharged, and the backflow of external water can be prevented, so that a high-quality improved soil replacement method can be implemented. In addition, by adopting the counterweight method, the flap valve can be automatically opened and closed with a simple and low-cost device, and the closing pressure can be easily changed, compared to the conventional system with an opening and closing lid and an opening and closing cylinder. Can be.
[0028]
According to a eleventh aspect of the present invention, the dredged soil and the solidified material (such as cement milk) are mixed in the pipe while the pulverized soil is pneumatically conveyed by the pressure feeding pipe, provided at the tip of the pressure feeding pipe, and installed on the barge. The carrier air is separated from the mixed solidified treated soil consisting of dredged soil and solidified material by the deenergized separator (so-called deenergized cyclone), and the mixed solidified treated soil is removed from the tremie pipe connected to the lower discharge port of the deenergized separator. This is a casting device that is installed at the disposal site.The height of the mixed and solidified treated soil in the deenergization separator is detected by a pressure gauge installed at the lower part of the deenergization separator, and the deenergization is performed based on this detected value. Mixed solidification treatment in a pipe characterized in that the height of the mixed solidification treatment soil in the separation device is adjusted so that the height of the mixed solidification treatment soil falls between the upper limit value and the lower limit value. This is a soil casting device.
[0029]
According to a twelfth aspect of the present invention, in the casting apparatus according to the eleventh aspect, the pressure gauge is provided with a high-pressure washing device for washing the sensing portion of the pressure gauge with a high pressure. It is a device for placing treated soil.
[0030]
Claims 11 and 12 are inventions relating to monitoring of a deenergized cyclone applied to the "underwater tremy casting method". In order to monitor the height of the mixed and solidified treated soil in the deenergized cyclone, (1) a diaphragm type sensing part and a Bourdon tube type pressure gauge are provided on the bottom side surface of the deenergized cyclone through a communication pipe, and the detection pressure is set. As a result, the height of the mixed solidified soil in the deenergized cyclone is grasped, an alarm is output with a buzzer or a lamp at the upper and lower limits, and the amount of pneumatic conveyance of the mixed solidified soil is fed back to the pneumatic ship. The height of the mixed solidified soil in the deenergized cyclone is controlled so as to fall within the range between the upper limit value and the lower limit value. {Circle around (2)} In order to increase the accuracy of the pressure sensing unit, high-pressure washing water is supplied from a high-pressure washing device to a diaphragm pressure receiving surface or a communication pipe of the sensing unit to perform high-pressure washing (claim 12).
[0031]
According to the eleventh and twelfth aspects, the upper limit value and the lower limit value of the height of the mixed solidified soil in the deenergized cyclone can be grasped by the pressure gauge, and this is fed back to the compressed air of the mixed solidified soil. By carrying out the management, it is possible to receive a stable supply of the mixed solidified treated soil, thereby keeping the inside of the tremy pipe filled with the mixed solidified treated soil and flowing down and discharging the mixed solidified treated soil in the fully filled state. In addition, the backflow of external water is also prevented, and a high-quality and stable underwater replacement improved soil can be formed.
[0032]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 shows an example of a construction method by the in-pipe mixing and solidification treatment method according to the present invention. FIG. 2 to FIG. 10 show an example of an apparatus for placing mixed solidified treated soil in a pipe according to the present invention.
[0033]
In the construction example of FIG. 1, the dredged soil A dredged by the dredger 1 is transported to the pneumatic transport ship 3 by the earth transport vessel 2, and in the pneumatic transport vessel 3, the dredged soil A is put into the hopper, and the pneumatic transport pipe is used. 4 transported to landfill. During transportation, a solidified material (such as cement milk) B is added in the solidified material supply ship 5 near the hopper portion of the pneumatic pressure ship 3 or in the middle of the pressure pipe. The dredged soil A and the solidified material B are carried as a plug flow in the pumping pipe 4, and the dredged soil A and the solidified material B are kneaded by the turbulence effect in the pumped pipe. The dredged soil A and the solidified material B are discharged as a sufficiently kneaded solidified treated soil M at the discharge port of the pressure feeding pipe 4 of the casting vessel 6, and the landfill 8 inside the revetment 7 is reclaimed.
[0034]
FIGS. 2 and 3 are a plan view and a side view showing an example of an in-pipe mixed-solidification treated soil casting vessel (underwater tremy casting method) according to the present invention. The barge is a combination of the barge, on which the final end of the pumping tube 4, the deenergizing cyclone 11 of the deenergizing separation device, and the tremy tube 12 of the tremy tube device are mounted. As will be described later, the tremee pipe 12 is provided in the deenergization cyclone 11 so as to be rotatable in the vertical direction so that it can be stored in a horizontal state on the barge from the hanging casting state. A vertically long opening 13 (FIG. 2) through which the tremee tube 12 can pass is provided. The casting boat 6 is moved by a towing method using a winch and a wire rope or by another driving device.
[0035]
FIG. 4 is a plan view, a side view, and the like showing an example of the deenergizing separation device. The cylindrical deenergizing cyclone 11 is placed on a pedestal 20 installed on a barge, and a side portion at an upper portion thereof is provided. Is formed with an upper inlet 21. The discharge end of the pumping tube 4 is connected to the upper inlet 21. The solidified treated soil M transported in the pumping tube 4 is tangentially input and swirls along the wall surface. At the same time as the energy is reduced, the solidified soil M and the carrier air are centrifuged outward and inward due to the difference in specific gravity. The inner conveying air is discharged to the outside from an exhaust pipe 22 that communicates with the upper center of the deenergizing cyclone 11. The solidified soil M is discharged from a lower discharge port 23 provided on a lower side surface of the deenergizing cyclone 11.
[0036]
In such a deenergizing cyclone 11, as shown in FIG. 4 (a), the impact dispersion wings 24 formed on the inner surface of the cyclone 11 by convex portions (protrusions) extending vertically extend at equal intervals in the circumferential direction. They are arranged (six in the illustrated example) to achieve the initial energy reduction. As shown in FIG. 4D, the impact dispersion blade 24 can be formed of an angle material having a predetermined length.
[0037]
As shown in FIG. 4B, the bottom plate 25 of the deenergizing cyclone 11 is formed as an inclined plate having a downward slope toward the lower discharge port 23. The bottom plate 25 has a right-angled triangular shape in a side view. A partition plate 27 is provided to partition the bottom space 26 into a discharge space 26a on the lower discharge port side and a storage space 26b on the opposite lower discharge port side, so that the final energy is reduced at the cyclone bottom and a mud pool is formed as a buffer area. . The fallen solidified soil M accumulates in the storage space 26b, overflows the partition plate 27, flows into the discharge space 26a, and is discharged from the lower discharge port 23.
[0038]
As shown in FIG. 4 (c), a plurality of reinforcing ribs 28 are provided on the lower discharge port side of the partition plate 27 to reinforce the partition plate 27. It is used as a water hole or a hole for stones.
[0039]
FIG. 5 is a plan view showing an example of a connection part between the energy-reducing cyclone and the tremee pipe. A horizontal discharge pipe 30 is connected to the lower discharge port 23 of the energy-reducing cyclone 11, and a rotatable pipe is connected to the horizontal discharge pipe 30. A connection curved pipe 32 with a 90 ° elbow is connected via a swivel joint 31 which is a joint, and the tremee pipe 12 is connected to the connection curved pipe 32. The horizontal discharge pipe 30 is provided with an emergency water stop valve 33. The tremee pipe 12 and the connection curved pipe 32 are vertically rotated about the rotation center axis L, so that a rotation shaft 34 reinforced by a reinforcing rib is horizontally and integrally protruded from the connection curved pipe 32, and this rotation axis is The tip of 34 is supported by a bearing 36 provided on a gantry 35.
[0040]
In the tremie pipe device having such a configuration, a horizontal portion is formed by the horizontal discharge pipe 30 and the swivel joint 31 at a portion where the solidified treated soil M is drawn out from the lower part of the deenergizing cyclone 11, so that deenergization and solidification are performed. A stable flow of the treated soil M can be achieved.
[0041]
Elevation by rotation of the tremie tube 12 is performed by, for example, a winch / wire rope system. That is, as shown in FIGS. 2 and 3, a portal frame 40 is installed across the opening 13 of the casting boat 6, and a winch 41 is disposed in front of the portal frame 40. After being wrapped around a fixed pulley (not shown) of the gantry 40, it is connected to the tip of the tremy tube 12. The unwinding and rewinding of the wire rope 42 allows the tremy tube 12 to be in a vertically driven state and a horizontally stored state on a barge (see FIG. 3).
[0042]
As shown in FIGS. 2 and 3, the tremee pipe 12 is composed of a divided pipe 12a having a predetermined length. The installation length. If the change in water depth is small, the tremy tube 12 may be slightly pulled up and inclined. In this case, an inclination scale is attached to the upper part of the tremie tube 12 so that the inclination angle can be managed.
[0043]
FIG. 6 is a side view showing an example of the flap valve at the tip of the tremee tube. FIG. 7 is a side view showing one example of a counterweight device for applying a predetermined closing pressure to the flap valve. That is, as shown in FIG. 6, a flap valve 50 is provided at the tip of the tremy tube 12 to prevent the backflow of the external water, and Inside 12 is always solidified soil M only.
[0044]
At the tip of the tremy tube 12, a tip discharge pipe 14 with a 45 ° elbow is attached so that the tip discharge port 14 a is obliquely downward when the tremy tube 12 is in a vertical state. The flap valve 50 normally closes the tip discharge port 14a by a predetermined closing pressure by a counterweight device, and when the weight of the solidified treated soil M in the deenergizing cyclone 11 and the tremie pipe 12 exceeds the closing pressure, The discharge port 14a can be automatically opened.
[0045]
The flap valve 50 is a lid having a size capable of completely closing the distal end discharge port 14a. The upper end of the flap valve 50 is rotatably attached to the upper outer surface of the elbow 14 by a rotation shaft 51 and can be opened and closed. A wire rope 62 of a counterweight device is connected to a lower portion of the flap valve 50, and the wire rope 62 is pulled upward by the weight of the counterweight, so that a closing pressure is applied to the flap valve 50. A pulley 52 for guiding the wire rope 62 is provided on the outer surface of the elbow 14.
[0046]
As shown in FIG. 7, the counterweight device includes a gate-shaped weight support base 60, a counterweight 61, a wire rope 62, a pulley 63, an electric winch 64, and the like. The weight support gantry 60 is a gantry for accommodating the counterweight 61 in a vertically movable manner, and is installed on the casting boat 6 in the vicinity of the connection curved pipe 32 of the tremy pipe 12. A pulley 63 is installed on the weight support base 60, and the other end of the wire rope 62 having one end connected to the flap valve 50 is connected to the counterweight 61 via the pulley 63.
[0047]
The counterweight 61 is composed of a plurality of divided weights 61a, and by increasing or decreasing the number, the closing pressure of the flap valve 50 can be changed, and the closing pressure can be changed according to the pipe frictional resistance of the solidified treated soil M. . The electric winch 64 is attached to the column 65 on the weight support base 60, and the closing pressure of the flap valve 50 can be immediately reduced to zero by raising the counterweight 61. A guide pulley 66 for the wire rope 62 is provided on the connection curved pipe 32 and the casting boat 6 as appropriate.
[0048]
FIG. 8 is a plan view showing an example of a pneumatic device for resolving the blockage of the tremie tube. In the case where the air ejection nozzle 70 is provided near the connection curved tube 32 of the tremie tube 12 and the inside of the tremie tube 12 is slightly blocked, The compressed air is injected from the air ejection nozzle 70 into the tremie tube 12 to release the closed state. A plurality of air ejection nozzles 70 may be provided at intervals in the circumferential direction of the tremie tube 12, or a plurality of air ejection nozzles 70 may be provided at intervals in the longitudinal direction of the tremee tube 12. A compressor 72 is connected to the air ejection nozzle 70 via an air pipe 71.
[0049]
FIG. 9 is a side view showing an example of a pressure detecting device for monitoring the height of the solidified treated soil inside the deenergizing cyclone, and a communication pipe (socket, nipple, T) 80, a diaphragm-type pressure-sensitive portion 81 and a Bourdon tube-type pressure gauge 82 are attached to the communication pipe 80, and the pressure of the solidified soil M deforms the diaphragm 81a of the pressure-sensitive portion 81 to change its pressure. Is detected by the pressure gauge 82. The height of the solidified soil M can be known from the pressure detected by the pressure gauge 82. The pressure gauge 82 is connected to a microswitch 83 that operates at the upper and lower limits, and outputs an alarm using a warning rotary lamp 84 or the like.
[0050]
Further, in order to increase the detection accuracy of the pressure detection unit, the pressure detection device is provided with a high-pressure cleaning device. That is, cleaning valves (ball valves, etc.) 90 and 91 are connected to the communication pipe 80 and the sensing section 81, respectively, and the inlet of the sensing section 81 opened in the communication pipe 80 and the pressure receiving surface of the diaphragm 81a of the pressure sensing section 81. The side can be washed with high pressure. A high-pressure cleaning pump 93 is connected to the cleaning valves 90 and 91 via a high-pressure rubber hose 92. The cleaning valves 90 and 91 are opened with a wrench or the like, and high-pressure cleaning water W is supplied. The high-pressure washing water W flows as shown by the dotted line, and flows into the deenergizing cyclone 11.
[0051]
FIG. 10 is a cross-sectional view showing one example of the placement management using the above-described pressure detecting device. The pressure gauge 82 and the like are provided below the deenergized cyclone 11, set an upper limit value and a lower limit value for the deenergized cyclone 11, and set the range as a moving range of the processed soil M by pneumatic feeding of the processed soil M. Control pneumatic delivery.
[0052]
This principle consists of a balance between the discharge resistance pressure and the indentation pressure of the solidified treated soil (improved soil). The discharge resistance pressure is the internal resistance of the tremy pipe, the external water pressure at the pipe tip, and the pipe friction resistance at the horizontal part of the swivel joint. The improved soil pushing pressure is the height of the improved soil deposited in the deenergized cyclone, that is, the sediment pressing pressure (lower limit value). When the improved soil accumulates in the deenergized cyclone by the improved soil pressure feeding, the weight balance (pressing pressure) of the improved soil is broken, the improved soil is pushed into the tremy pipe, and the improved soil is discharged into water. When the viscosity of the improved soil increases, the resistance in the pipe increases and the balance line rises. This limit is the upper limit.
[0053]
The lower limit and the upper limit are detected by a pressure gauge, and an alarm is output by a buzzer or a lamp. By analyzing such information and feeding it back to the pneumatic carrier to manage the improved soil, it is possible to receive a stable supply of improved soil. As a result, the inside of the tremy tube can always be maintained in a full state, and there is no backflow of air and outside water from the end of the tube, and a high quality and stable underwater replacement soil can be formed.
[0054]
In the above, the case of applying to the `` underwater tremy casting method '' in which the deenergized cyclone is mounted on the casting vessel and the mixed solidified treated soil in the deenergized cyclone is installed underwater via the tremy tube The deenergized cyclone of the present invention can also be applied to a “falling-over method”. In addition, it goes without saying that each device is not limited to the illustrated example, and other embodiments can be adopted.
[0055]
【The invention's effect】
The present invention has the above-described configuration, and has the following effects.
[0056]
(1) A plurality of projections provided on the inner surface of the deenergizing cyclone aim at the initial deenergization by the impact dispersing wing, and the final deenergization is performed by the partition plate at the bottom of the deenergizing cyclone, and at the same time, on the side opposite to the lower discharge port side. By using the storage space as a buffer area for the mud pool, the energy dissipation effect can be increased as compared with the conventional energy dissipation cyclone. In the case of the tremy pipe method, the blow-out pressure of the mixed solidified soil remains as in the past and flows down while rotating inside the tremy pipe, and the mixed solidified soil and water are agitated, so that material separation does not occur, and air blow is performed. The quality equivalent to that of the equipment can be secured. Furthermore, by providing a horizontal portion with a horizontal discharge pipe at the draw-out portion of the mixed solidified treated soil at the bottom of the deenergized cyclone, a deenergizing effect can be obtained, and a stable flow of the mixed solidified treated soil can be achieved.
[0057]
(2) By installing a tremy tube vertically rotatable through a horizontal discharge pipe, swivel joint, and connecting curved pipe on the bottom side of the deenergized cyclone, it is possible to perform vertical casting, further pull up the tremy pipe, and install a split pipe. It is possible to change the casting length according to the water depth by adding and removing, which makes it possible to perform good casting work, workability is good, fine control is possible, and quality is improved Can be. In addition, compared to a conventional telescopic tremie tube and a telescopic variable type using a hydraulic jack, it is possible to follow a change in water depth with a simple and low-cost device.
[0058]
(3) By providing a flap valve that automatically opens and closes at the tip of the tremy tube, the inside of the tremy tube can be maintained in a full state with the mixed and solidified treated soil, and the mixed and solidified treated soil can flow down and be discharged in the fully filled state. In addition, since the backflow of the external water is also prevented, it is possible to implement a high-grade improved soil replacement method. In addition, by adopting the counterweight method, the flap valve can be automatically opened and closed with a simple and low-cost device, and the closing pressure can be easily changed, compared to the conventional system with an opening and closing lid and an opening and closing cylinder. Can be.
[0059]
(4) Stable mixing by grasping the upper and lower limits of the height of the mixed solidified soil in the deenergized cyclone with a pressure gauge and feeding it back to the pneumatic feeding of the mixed solidified soil for management. It is possible to receive the supply of the solidified treated soil, thereby keeping the inside of the tremy pipe filled with the mixed solidified treated soil, allowing the mixed solidified treated soil to flow down and discharge in the fully filled state, and Backflow is also prevented, and a high-quality and stable underwater replacement improved soil can be formed.
[Brief description of the drawings]
FIG. 1 is a flow diagram and a schematic cross-sectional view showing an example of a construction method by a mixing and solidifying treatment method in a pipe according to the present invention.
FIG. 2 is a plan view showing an example of a vessel for placing and mixing soil in a pipe according to the present invention.
FIG. 3 is a side view of the casting boat of FIG. 2;
FIGS. 4A and 4B show an example of a deenergizing separation device of the present invention, wherein FIG. 4A is a plan view, FIG. 4B is a side view, FIG. 4C is a plan view of a bottom plate, The side view of a reinforcement rib, (d) is the front view and side view of an impact dispersion wing.
FIG. 5 is a plan view showing an example of a connection portion between the deenergizing cyclone and the tremee tube according to the present invention.
FIG. 6 is a side view showing an example of the flap valve at the tip of the tremee tube of the present invention.
FIG. 7 is a side view showing an example of a counterweight device for applying a predetermined closing pressure to the flap valve of the present invention.
FIG. 8 is a plan view showing an example of a pneumatic device for relieving the blockage of the tremie tube according to the present invention.
FIG. 9 is a side view showing an example of a pressure detector for monitoring the height of the solidified soil inside the deenergized cyclone of the present invention.
FIG. 10 is a cross-sectional view showing one example of a placement management using the pressure detection device of the present invention.
11A and 11B are schematic cross-sectional views showing a conventional general in-pipe mixing and solidification method, in which FIG. 11A is a downflow method and FIG. 11B is an underwater tremy casting method.
12A and 12B are side views of a conventional casting device, in which FIG. 12A is a ladder system, FIG. 12B is a tilting chute system, and FIG.
[Explanation of symbols]
A: Dredge soil
B: solidified material
M: mixed solidified soil in pipe (improved soil)
1 ... Dredger
2 ... Earth carrier
3 ... Pneumatic ship
4 ... Pressure pipe
5 ... Solid material supply ship
6 ... Casting boat
7 ... Revetment
8. Landfill
10 ... Float
11 ... Energetic cyclone
12 ... Tremy tube
12a ... split pipe
13 ... Opening
14: Tip discharge pipe (45 ° elbow)
14a: Tip outlet
20 ... pedestal
21 ... Top inlet
22 ... exhaust pipe
23 Lower outlet
24: Impact dispersion wing (convex part)
25 ... bottom plate
26 ... Bottom space
26a ... discharge space
26b ... storage space
27 .... Partition plate
28 ... Reinforcing rib
29 ... Notch hole
30 Horizontal discharge pipe
31 ... Rotary Swivel Joint (Swivel Joint)
32 Connection curved pipe (90 ° elbow)
33 ... Emergency stop valve
34 ... rotary axis
35 ... Stand
36 ... Bearing
40 ... Gate-type stand
41 ... winch
42 ... wire rope
50 ... Flap valve
51 ... Rotary axis
52 ... pulley
60 ... weight support base
61 ... Counter weight
61a: Split weight
62 ... wire rope
63 ... Pulley
64 ... Electric winch
70 Air blow nozzle
71 …… Air piping
72 .... Compressor
80 …… Communication pipe
81 ... Pressure sensing part
81a ... diaphragm
82 Pressure gauge
83 ... Micro switch
84 ... Rotating light for warning
90 ... valve for cleaning
91 ... Cleaning valve
92 ... High pressure rubber hose
93 ... High pressure washing pump

Claims (12)

While the dredged soil is pneumatically conveyed by the pressure pipe, the dredged soil and the solidified material are mixed in the pipe in the pressure pipe, and the energy is separated from the mixed solidified treated soil composed of the dredged soil and the solidified material by the energy-reducing device provided at the tip of the pressure pipe. It is a casting device that separates air and places the mixed and solidified treated soil at the disposal site from the lower discharge port of the deenergization separator,
A lower discharge port of the deenergization separator is provided on a lower side surface of the deenergization separator, and a partition that divides a bottom space into a lower discharge port side discharge space and a non-lower discharge port side storage space on a bottom plate of the deenergization separator. An apparatus for placing mixed solidified soil in a pipe, comprising a plate. 2. The mixing and solidifying process according to claim 1, wherein convex portions extending in a vertical direction are arranged at intervals in a circumferential direction on an inner surface of the deenergizing / separating device. Soil casting device. 3. The casting device according to claim 1, wherein the bottom plate of the deenergizing / separating device is an inclined plate having a downward slope toward a lower discharge port. 4. apparatus. 4. The installation device according to claim 1, wherein the lower discharge port is connected to a horizontal discharge pipe. The dredged soil and the solidified material are mixed in the pipe while the pulverized soil is pneumatically conveyed by the pumping pipe, and the dredged soil and the solidified material are mixed in the pipe in the pumping pipe. It is a setting device that separates the carrier air from the mixed solidified treated soil and casts the mixed solidified treated soil to the disposal site from a tremie pipe connected to the lower discharge port of the deenergizing separation device,
A lower discharge port of the deenergization separator is provided on a lower side surface of the deenergization separator, a horizontal discharge pipe is connected to the lower discharge port, and a connection curved pipe is connected to the horizontal discharge pipe via a rotatable pipe joint. An apparatus for placing mixed solidified soil in a pipe, characterized in that a tremy pipe is connected to the connection curved pipe. 6. The apparatus according to claim 5, wherein the tremie pipe is composed of a divided pipe having a predetermined length. The dredged soil and the solidified material are mixed in the pipe while the pulverized soil is pneumatically conveyed by the pressure feed pipe, and the dredged soil and the solidified material are mixed in the pipe in the pressure feed pipe, and the dredged soil and the solidified material are provided at the tip of the pressure feed pipe and the deenergizing separation device installed on the barge It is a setting device that separates the carrier air from the mixed solidified treated soil, and casts the mixed solidified treated soil to the disposal site from a tremie pipe connected to the lower discharge port of the deenergizing separation device,
At the tip of the tremee pipe, the tip discharge port is normally closed by a predetermined blocking pressure, and the tip discharge port is automatically closed when the weight of the mixed solidified treated soil in the deenergizing separation device and the tremy pipe exceeds the blocking pressure. An apparatus for placing mixed solidified soil in a pipe, comprising a flap valve that can be opened. In the setting device according to claim 7, one end of the flap valve is pivotally supported by one end of the distal end discharge port of the tremy pipe, and one end of the tow cord is connected to the other end of the flap valve. A counterweight installed on a barge is connected to the other end of the towed wire, and the counterweight is configured to apply a closing pressure to the flap valve. Equipment. 9. The casting device according to claim 8, wherein a hoist for lifting the counterweight to release the closing pressure is provided on the barge. The casting device according to claim 7 or 8, wherein the tremy pipe is provided with an air jet nozzle for jetting compressed air into the tremy pipe. apparatus. The dredged soil and the solidified material are mixed in the pipe while the pulverized soil is pneumatically conveyed by the pressure feed pipe, and the dredged soil and the solidified material are mixed in the pipe in the pressure feed pipe, and the dredged soil and the solidified material are provided at the tip of the pressure feed pipe and the deenergizing separation device installed on the barge It is a setting device that separates the carrier air from the mixed solidified treated soil, and casts the mixed solidified treated soil to the disposal site from a tremie pipe connected to the lower discharge port of the deenergizing separation device,
The height of the mixed and solidified soil in the deenergization separator is detected by a pressure gauge installed at the lower part of the deenergization separator, and the height of the mixed and solidified soil in the deenergization separator is determined based on the detected value. An apparatus for setting a mixed solidified soil in a pipe, wherein the height of the mixed solidified soil is adjusted so as to fall between an upper limit value and a lower limit value. 12. The apparatus for placing and mixing solidified soil in a pipe according to claim 11, wherein the pressure gauge is provided with a high-pressure washing device for washing a sensing portion of the pressure gauge with high pressure.

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