JP2019130495A - Method and apparatus for dehydration treatment of wet earth and sand - Google Patents

Abstract

To provide a method and apparatus for dehydration treatment of wet earth and sand that can relatively easily dehydrate sewage having a high water content ratio generated at a construction site or the like without the need for conveying power like a screw conveyor.SOLUTION: The present invention provides a method for dehydration treatment of wet earth and sand that dehydrates earth and sand with a high water content by suction by the negative pressure of a vacuum pump 7 to reduce the water content. With a casing 5 held vertically or at a predetermined inclination angle, the wet earth and sand ES to be treated is placed and stored in a water-permeable cylindrical covering bag 4 arranged in the vertical direction inside the casing 5 from the upper opening, and then, the inside of the casing is sucked with the vacuum pump 7 from numerous suction holes 52 provided around the casing, so that the wet earth and sand in the covering bag is dehydrated.SELECTED DRAWING: Figure 1

Description

  The present invention is a method for dewatering hydrous soil that is suitable for the case where the water content is reduced to such an extent that it can be used as a filling material for sandbags or the like by relatively dehydrating the sediment with high water content to be treated. The present invention relates to a processing method and apparatus.

  For example, the excavated soil generated by construction foundation excavation and the uplifted soil generated by compacted sand pile construction such as the sand compaction pile (SCP) method have a high moisture content and are difficult to transport or reuse as they are . As such water-containing earth and sand dewatering treatment method and apparatus, Patent Documents 1 and 2 disclose, in particular, a structure for reducing the water content ratio by dewatering earth and sand having a high water content ratio by suction action due to the negative pressure of a vacuum pump. Yes.

  FIG. 8 is disclosed in Patent Document 1. In this dewatering method, the screw conveyor 1 is composed of a screw 6 for carrying earth and sand, and an outer cylinder 3 having a double structure as an outer cylinder and an inner cylinder 4 having a large number of water collecting holes 10. Then, electroosmosis is caused to act on the hydrous sand 29 introduced with the screw 6 side as an anode and the inner cylinder 4 side as a cathode, and the internal water is extracted as soil water 29a, and the space 9 is vacuum dehydrated. The soil water 29a is sucked and collected to dehydrate (claims 1 and 2). Moreover, the apparatus main part is equipped with the screw conveyor 1 which has the earth-and-sand introduction hopper 2 in the front end, and has the earth discharge port 21 and the discharge pipe 7 in the rear end. The screw conveyor 1 is arranged through an insulating outer cylinder 3 and a circumferential space 9 inside the outer cylinder 3, and is disposed in the inner cylinder 4 with a water collecting hole and can transport earth and sand. The screw 6 is connected to the positive electrode of the DC power supply device 22 as an anode, the inner cylinder 4 is connected to the negative electrode as a cathode, and the vacuum pulling tube 28 connected to a vacuum pump is connected to the clearance 9. (Claim 5).

  9A and 9B are disclosed in Patent Document 2. FIG. In this dewatering method, the soil excavated by the bucket is dewatered to a state where it can be easily transported. The bucket 10c attached to the arm of the excavator construction vehicle has a double structure, and the lining is formed by a net (perforated plate 10d). Then, the bucket 10c scoops up the mud and sand and applies vibration to the bucket 10c to promote the separation of moisture, while the space between the double structures is sucked by a negative pressure, that is, by the suction action by the negative pressure of the vacuum pump. Water is separated (claims 1 and 3). The main part of the apparatus has a double structure in which the bucket 10c is provided with a net lining (perforated plate 10d) in order to dewater the muddy water-soiled soil picked up by the bucket to a state where it can be easily transported. And means (vacuum pump 11) for vacuum-sucking the space between the bucket body and the net lining (porous plate 10d), and a vibrator 13 provided in the bucket 10c.

JP 2004-190417 A Japanese Patent No. 4236869

  In the above-mentioned Patent Document 1, in the process of conveying the hydrous sand to be treated from one end of the cylinder body to the other end side with a screw, the internal water is extracted as soil water by electroosmosis and the vacuum dehydration is performed in the surrounding space Since the soil water is sucked and dehydrated, in addition to driving the screw conveyor, a DC power supply unit used for electroosmosis and a vacuum pump-related configuration for vacuum suction are required, and the operation cost is complicated and high. Japanese Patent Laid-Open No. 7-71052 discloses a configuration in which the above electroosmotic action is omitted and water is dehydrated by moving the high moisture content earth and sand with a vacuum conveyor while evacuating the water with a vacuum pump. . In this case, it is simplified as much as the electroosmotic action is omitted as compared with Document 1, but the reduction in operating cost is not expected so much because a screw conveyor is essential.

  In the above-mentioned Patent Document 2, as a configuration for dewatering excavated earth and sand to a state where it can be easily transported, in order to dehydrate by vacuuming with a vacuum pump in a state where the water-containing earth and sand to be treated is scooped up in the excavator bucket of the construction vehicle In addition, since the action of the vacuum pressure is local, work efficiency is poor and it is time consuming and troublesome to process a large volume of hydrous sand.

  The purpose of the present invention is to dehydrate dehydrated soil that can be dehydrated relatively easily without the need for conveying power such as a screw conveyor, because of the above background. It is to provide a method and apparatus. More preferably, an apparatus or an apparatus component used in an existing SCP or coated sand pile construction method is utilized as much as possible, so that the apparatus cost can be reduced and the dehydration process can be performed efficiently. Other purposes will be clarified in the description below.

  In order to achieve the above object, according to the present invention of claim 1, referring to the drawings, dewatering treatment of hydrous sand that dehydrates soil ES with a high water content by suction action due to the negative pressure of vacuum pump 7 to reduce the water content In this method, a water-permeable cylindrical covering bag 4 is arranged in the vertical direction inside the casing while the casing 5 is held vertically or at a predetermined inclination angle. After introducing and containing a certain hydrous sand ES, the hydrous sand in the covering bag is dehydrated by sucking the inside of the casing 5 with the vacuum pump 7 from a number of suction holes 52 provided around the casing. It is a feature.

  The invention of claim 6 is a dewatering apparatus for hydrous sand which reduces dehydration by dehydrating high moisture content earth and sand ES by the suction action by the negative pressure of the vacuum pump 7. A casing 5 that is held at an inclined angle and has a number of suction holes 52 provided around it, and that can open and close the upper and lower ends, and a sand hopper 3 that is connected to the upper side of the casing, A water-permeable cylindrical covering bag 4 that is disposed in the vertical direction inside the casing 5 and can receive the target hydrous sand ES through the hopper 3 from the upper opening, and the suction hole 52 is attached. And a suction pipe 53 connected to the suction side of the vacuum pump 7.

  The above dehydration method and apparatus are devised by paying attention to the point that the SCP and the coated sand pile forming apparatus can be used as they are, except for the vacuum pump, the casing with the suction holes, and the suction pipe. The supporting means for the casing may be supported by, for example, a backhoe machine other than the leader of the crawler type machine mentioned in the embodiment. The casing is preferably held substantially vertically, but may have a predetermined inclination angle, that is, an angle at which the casing falls due to its own weight when the hydrated earth and sand are introduced from above.

Each of the above inventions is more preferably embodied as described below.
(A) In claim 1, the vacuum pump is configured to apply vibration to the casing together with vacuum suction (claim 2).
(A) In claim 1 or 2, the vacuum pump is configured to introduce compressed air into the casing and to pressurize the upper side of the covering bag together with vacuum suction (claim 3).
(C) In Claim 3, the apparatus has a substantially cylindrical holder mounted on the upper end side of the covering bag, and an opening / closing means disposed inside the holder, and introduces and pressurizes the compressed air. In the operation, the upper opening of the covering bag is switched to the closed state by the opening / closing means (Claim 4).

(D) In any one of claims 1 to 4, after the dehydration treatment, the covering bag in the earth and sand containing state is pulled out from the opening on the lower side of the casing, divided into a predetermined length, and the divided surface is covered. (Claim 5). As illustrated in FIG. 7, as an example of using the covering bag used in the dehydrating method of the present invention together with the dewatered earth and sand, a sandbag is created. Of course, for the dewatered earth and sand, after drawing out the covering bag filled with earth and sand from the lower opening of the casing, or with the covering bag placed in the casing, the earth and sand is taken out from the covering bag, for example, for embankment, You may make it use as earth for sand for SCP and covering sand piles.

(E) According to claim 6, there is provided a pressure means for introducing compressed air in the casing and on the upper side of the covering bag, and / or a vibrator for applying vibration to the casing. (Claim 7).

  In the first aspect of the invention, as a vacuum dewatering type, a water-permeable cylindrical covering bag is arranged in the vertical direction of the casing while maintaining the casing at a vertical or predetermined inclination angle, and the object to be treated is opened from the upper opening to the covering bag. In order to suck the inside of the casing with a vacuum pump from the suction hole around the casing after loading and containing the hydrated earth and sand, transport power like a screw conveyor is required as compared with the configuration of dewatering while moving the hydrated earth and sand as in Patent Document 1. However, it is relatively easy to efficiently dehydrate even large volumes of hydrous sand.

  In the invention of claim 2, dehydration efficiency can be improved by promoting dehydration of the hydrous sand by applying vibration to the casing together with vacuum suction by a vacuum pump.

  According to the third aspect of the present invention, the dewatering efficiency can be improved by promoting the dehydration of the hydrous sand by vacuuming with the vacuum pump and introducing the compressed air into the casing and applying pressure to the upper side of the covering bag. In this case, in the invention of claim 4, in the operation of introducing and pressurizing the compressed air, the upper opening of the covering bag is closed by the opening / closing means arranged inside the cylindrical holder attached to the upper end side of the covering bag. If it is in a state, the dehydration efficiency can be further improved.

  In the fifth aspect of the present invention, a sandbag can be easily made by pulling out from the casing together with a covering bag using dewatered earth and sand as illustrated in FIG. That is, in this invention, a sandbag can be created efficiently by passing through a dehydration process, a drawing process, a dividing process, and a dividing surface sealing process, which is optimal for effective use of hydrous sand.

  In the invention of claim 6, it becomes an apparatus suitable for the dewatering treatment method of claim 1, and as described above, as the vacuum dewatering type, it is possible to provide the existing SCP and the coated sand pile forming apparatus with a slight improvement, and can be provided with reduced costs. . Specifically, except for the vacuum pump, the casing and the suction pipe, the casing supporting means, the sand transport bucket and its lifting and lowering means, the compressor and the sheave tank, etc. constituting the SCP and the coated sand pile forming device are used as they are. Available. In addition, since the SCP and the coated sand pile forming device are often used in construction sites where the hydrous sand to be treated is generated, it is easy to implement with reduced costs.

  In the invention of claim 7, the pressurizing means and the vibrator are also used in the SCP and the coated sand pile forming device, and the vacuum dehydration action can be improved by using the pressurizing means and the vibrator.

It is the model block diagram which fractured | ruptured partially which shows the dehydration processing apparatus of the hydrous sand of a form example. (A) And (b) is the AA line schematic cross section of FIG. 1, (a) shows in the state which does not throw in hydrous sand into a covering bag, (b) is the state which put hydrous sand in a covering bag (C) has shown the modification which changed arrangement | positioning of the suction hole (suction pipe) of a casing. (A) is a schematic cross-sectional view showing the upper structure of the covering bag, (b) is a schematic top view showing the covering bag of (a) as viewed from above, and (c) is an opening / closing means for opening the upper opening of the covering bag. It is a model top view shown in the closed state. (A) is a schematic diagram which shows the sealing process structure of both end surfaces when a coating bag is divided | segmented, (b) is a schematic diagram which shows the modification of a sealing process structure. In the dehydration method of the present invention, (a) and (b) are schematic diagrams showing a covering bag setting step for disposing a covering bag on a casing and a hydrated earth and sand loading step for charging hydrated earth and sand into the covering bag. It is a schematic diagram which shows the spin-drying | dehydration process dehydrated by the attraction | suction action by the negative pressure of a vacuum pump with the spin-drying | dehydration processing method of this invention. (A) is a schematic diagram which shows the extraction | drawer middle of a covering bag from a casing, (b) is explanatory drawing at the time of dividing | segmenting the covering bag which accommodates the extracted earth and sand and making a sandbag. It is explanatory drawing which shows the structure (FIG. 1) disclosed by patent document 1. FIG. (A) And (b) is explanatory drawing which shows the structure (FIG. 1, FIG. 2) disclosed by patent document 2. FIG.

  Embodiments to which the present invention is applied will be described below with reference to the drawings. In this description, after describing the main components of the dehydrating apparatus of the present invention, a dehydrating method using the same will be described in detail. The drawings are simplified in detail due to restrictions on drawing. In particular, in FIGS. 4 to 5, a part of the attachment located above the casing is omitted.

(Apparatus structure) In FIG. 1, although this dehydration processing apparatus was omitted on the drawing, it uses an existing SCP or a coated sand pile forming apparatus, and as a main member, a leader 1 which is a supporting means, And an attachment 10 slidably disposed along the side surface of the reader 1. Among them, the leader 1 is supported by a plurality of backstays in a state of being erected on a front support portion of a self-propelled base machine (not shown) as disclosed in, for example, Japanese Patent Application Laid-Open No. 2016-2111251. Further, the base machine is equipped with a leader raising / lowering wire and its winch, a wire 6a for raising and lowering the bucket 6 along the leader 1, its winch, a motor, an electric mount and the like as standard equipment.

  The attachment 10 includes upper and lower joint portions 11, 12, a hopper 2 coupled to the upper joint portion 11, a support plate 17 coupled to the lower joint portion 12, and a vibrator provided on the upper portion of the upper joint portion 11. And a shock absorber 14 provided on the upper side of the vibrator hammer 13, which are disposed between the suspension wire 15 and a pulley device (not shown) provided on the top of the leader 1. The sheave block 16 is suspended so as to be movable up and down.

  Among these, the hopper 2 includes a main body 20 and an inclined connecting portion 21 that are opened upward. When the hydrated earth and sand in the bucket 6 is thrown into the main body 20, it is dropped by its own weight through the inclined connecting portion 21 and into the casing 5 held by the upper joint portion 11 and the lower joint portion 12 and the flange member 18. The The upper joint portion 11 is provided with an air injection nozzle 27 that injects compressed air toward the discharge port 22 of the inclined connection portion 21. The lower joint portion 12 is provided with an air valve 24 that opens and closes the discharge port 22 of the inclined connection portion 21 and an air supply nozzle 28 that supplies compressed air and pressurizes the inside of the casing 5.

  The air valve 24 includes a valve main body 25 mounted on the upper inner periphery of the lower joint portion 12 and a valve lid 26 pivotally supported by the valve main body 25. The valve lid 26 is normally in an open position that hangs down by its own weight with respect to the valve body 25. For example, when the compressed air is injected from the air supply nozzle 28 in the dehydration process of the hydrous soil in the casing 5, as will be described later. The valve is pressed by the air pressure to be closed. However, the opening / closing mechanism of the air valve 24 may have other structures.

  The air injection nozzle 27 and the air supply nozzle 28 are connected to a compressor provided on the ground surface via a dedicated supply pipe so that compressed air having a required pressure can be independently injected when necessary. That is, the air injection nozzle 27 makes it possible to eliminate clogging in the vicinity of the discharge port by blowing away the hydrous sand that tends to accumulate in the vicinity of the discharge port 22 with a predetermined air pressure. The air supply nozzle 28 switches the air valve 24 to a closed state, or pressurizes the inside of the casing 5 in the closed state of the air valve 24 to promote a dehydrating action, which will be described later. The covering bag 4 is easily pulled out from the casing 5.

  On the other hand, the support plate 17 holds the winding drum 3 around which the wire 30 is wound so that it can be pulled out. The winding drum 3 is introduced into the cylinder of the casing 5 in which the wire 30 is held by the flange member 18 so as to be freely wound up, and is provided at the drawing end of the wire 30 to connect the upper end side of the covering bag 4 32. Here, the wire 30 is formed in a hollow tubular shape and is configured to be able to transfer compressed air from a compressed air supply source (not shown). The tip of the wire 30 is a connecting wire 30a, 30b that is divided into two forks via a connector 37. A supply pipe 39 such as a compressed air transfer tube is disposed along the wire in the connection wire 30a. The supply pipe 38 can transfer the compressed air transferred to the wire 30. As another configuration, the connecting wire 30a may be formed in a hollow tube like the wire 30, and the supply pipe 38 may be omitted. In FIG. 1, reference numeral 31 denotes a guide member that guides the lead-out end of the wire 30 to the center of the casing.

  3, the holder 32 includes a steel outer ring 33, an inner ring 34 attached to the inner side of the outer ring 33, and a tire tube-like rubber tube 35 disposed on the inner side of the inner ring 34. And have. Of these, the outer ring 33 has a slightly smaller inner diameter due to the protruding portion 33a. On the upper end surface of the outer ring 33, a pair of substantially L-shaped metal fittings 36 mounted at positions displaced by 180 degrees are provided. The distal ends of the corresponding connecting wires 30a and 30b are connected to the pair of metal fittings 36.

  Further, the inner ring 34 has an inner peripheral middle portion formed into a concave portion 34a having a one-step diameter, and a rubber tube 35 is attached to the concave portion 34a. The rubber tube 35 is an example of an opening / closing means for opening and closing the upper end side opening of the covering bag 4, and allows compressed air to be introduced into the tube through the supply pipe 39 or exhausts the air in the tube through the supply pipe 39. It is possible. That is, the rubber tube 35 is connected to the distal end 35a of the supply pipe 35 in a state where the outer peripheral side is regulated by the concave portion 34a, and is gradually moved toward the inner diameter side of the inner ring 34 by the compressed air introduced from the supply pipe 35. It expand | swells and the upper side opening of the covering bag 4 is closed by expanding to the maximum like FIG.3 (c). Further, when the rubber tube 35 is vacuum-sucked through the supply pipe 39, the wire 30, and the like, the overhang amount from the concave portion 34a is further reduced than in the cases (a) and (b). It does not get in the way when throwing in hydrous sand.

  The covering bag 4 is formed in a bottomed cylindrical shape by a nonwoven fabric or the like as shown in FIGS. The material can be woven or porous plastic as long as it is water permeable. The length of the covering bag 4 is slightly shorter than the entire size of the casing 5. The outer diameter of the covering bag 4 is kept in the casing 5 as shown in FIG. 2 (a), and there is a gap between the inner periphery of the casing 5, but the hydrous sand ES is in the bag. When a predetermined amount is inserted into the casing 5, the size contacts the inner periphery of the casing 5 as in (b).

  FIG. 4 shows a configuration example when the divided end face opening is sealed when the above-described covering bag 4 is divided into a predetermined length to make a sandbag 40. First, the configuration of FIG. 4A is an example in which the sealing body 42 or 43 is retrofitted to the edge or the periphery of the sandbag 40. The sealing body 42 has a disk shape corresponding to the opening of the end surface of the sandbag 40, and the outer peripheral edge is attached to the corresponding edge of the sandbag 40. The sealing body 43 has a cap shape, and includes a disk portion 43a corresponding to the opening of the end surface of the sandbag 40, and a cylindrical portion 43b that is integrated with the disk portion 43a and is attached to the periphery of the end of the sandbag 40. Reference numeral 44 denotes cut portions that are provided as needed at a plurality of locations of the cylindrical portion 43b. In addition, the lower side (cylindrical bottomed part) of the covering bag 4 is closed with the sealing body 41 in the state arrange | positioned in the casing 5. FIG. The sealing body 41 is formed integrally with the covering bag 4, but may be a separate body, and may be configured by sealing bodies 42 and 43 instead of the sealing body 41. The sealing bodies 41 to 43 may be the same or similar water-permeable material as the covering bag 4. Of course, the sealing bodies 41 to 43 described above may be omitted, and the lower opening of the covering bag 4 and the upper opening cut to a predetermined length may be tied and closed with a string or the like.

  4B, the flexible sealing body 45 is attached in advance around the covering bag 4, and after being divided as a sandbag 40, the sealing body 45 is inverted with the mounting side as a fulcrum, This is an example in which the opening of the end surface of the sandbag 40 is closed by restraining the sealing body 45 in a squeezed state via the string 46. That is, the sealing body 45 has a cylindrical shape with a string passage gap around it, and the string 46 has a configuration in which one end 46a is fixed in the circumference gap and the other end is pulled out from the surrounding gap. Yes. And the sealing body 45 is overlaid on the circumference | surroundings part of the covering bag 4 as shown to the lower side of the figure, and the end side located in the division | segmentation plan side is attached to the covering bag 4. FIG. In this attached state, the lead-out portion of the string 46 is arranged between the covering bag 4 and the sealing body 45, so that it does not get in the way. The sealing body 45 is reversed 180 degrees from the state in which the covering bag 4 is divided into the sandbags 40 with the mounting portion as a fulcrum as shown in the upper side of the figure, and the string 46 is pulled in the direction of further pulling out the drawing end. When closed, the whole is squeezed and closed. Moreover, the sealing body 45 winds the string 46 around the squeezed portion and performs a locking process, so that the divided end surface of the clay bag 40 is closed. In the configuration as described above, since the covering 4 can be handled in a state in which the plurality of sealing bodies 45 are attached in advance, a sandbag ES described later can be efficiently created.

  On the other hand, the casing 5 is a cylindrical member having an outer diameter of 30 to 50 cm and a length of about 3 to 5 m, as shown in FIGS. The lower joint portion 12, the upper joint portion 11, and the hopper 2 can communicate with each other in a vertical state where the upper end side is held by the flange member 18. Moreover, the casing 5 has many suction holes 52 provided in the periphery, and a lid 51 that is rotatably supported at the lower end and opens and closes the lower end opening. As shown in FIG. 2 (a), the suction holes 52 are provided at a predetermined interval in the longitudinal direction at a portion that is divided into four equal parts. In this case, the suction holes 52 are in the longitudinal direction as in the modification (c), and a plurality (four in this example) of suction holes 52 and a plurality of suction holes 52 provided around the lower side thereof are provided. When the suction holes 52 (four in this example) are shifted by a predetermined angle (about 45 degrees in this example) in the circumferential direction, the inside of the casing 5 can be sucked more uniformly.

  A suction pipe 53 for connection is attached to each suction hole 52 by welding or the like. In this suction structure, each suction pipe 53 is connected to the gas-liquid separator 8 connected to the vacuum pump 7 via connection pipes 54 to 56 and the like, and the suction force due to the negative pressure of the vacuum pump 7 is reduced. It acts in the casing 5 through the connecting pipes 54 to 56 and the suction pipe 53. In other words, in this structure, in the state where the target hydrous sand ES is charged and accommodated in the covering bag 4 disposed in the casing 5, the negative pressure of the vacuum pump 7 is passed through the suction pipes 53 and the connection pipes 54, 55, and 56. By exerting a suction action by pressure, the water content of the hydrous sand ES in the covering bag 4 is dehydrated to reduce the water content ratio. In this example, the moisture of the hydrous sand ES in the covering bag 4 is sucked together with air by the negative pressure of the vacuum pump 7 and enters the gas-liquid separator 8. Then, in the gas-liquid separator 8, the sucked muddy water is transferred to and stored in the muddy water storage tank 9 with the air removed.

(Dehydration Method) Next, a dehydration method using the above dehydration apparatus will be described. In this example, the water-containing earth and sand to be treated is dehydrated as shown in FIG. 5 to FIG. 7, and detailed description will be made including an operation for creating a sandbag using the treated earth and the used covering bag.

  In this dewatering treatment method, a covering bag setting step for suspending and setting the covering bag 4 with respect to the casing 5 that is supported upright, and the hydrous sand ES to be processed are put into the bag of the covering bag 4 set in the casing 5. The hydrated earth and sand charging step and the dehydrated step of dehydrating the hydrated earth and sand ES in the covering bag 4 by sucking the inside of the casing 5 with the vacuum pump 7 are performed. Furthermore, when making the sandbag SD using the earth and sand after the dehydration treatment, the drawing process of drawing out the covering bag 4 containing the dewatered earth and sand from the inside of the casing 5 and the earth and sand are contained after the dehydration process. The covering bag 4 is subjected to a dividing step of cutting and dividing the covering bag 4 into a sandbag 40 having a predetermined length in a soil-containing state, and a dividing surface sealing step of sealing the dividing surface of the sandbag 40.

  Here, in the covering bag setting step, the lid 51 provided on the lower end side of the casing 5 is opened as shown in FIG. Next, the wire 30 is pulled out by the rewinding operation of the winding drum 3 and pulled out from the lower end opening of the casing 5. Then, after the wire drawing end side is coupled to the holder 32 mounted on the upper end side of the covering bag 4, the covering bag 4 is set in the casing 5 as shown in FIG. To do. After the setting, the lid 51 is closed.

  In the hydrous sand loading process, as shown in FIG. 5B, the bucket 6 containing the hydrous sand ES is lifted from the surface side, and the hydrous sand ES in the bucket 6 drops into the main body 20 of the hopper 2 from the bucket outlet. Is done. Then, the water-containing earth and sand ES in the main body 20 passes through the inclined connection portion 21 and into the covering bag 4 disposed in the casing 5 from the discharge port 22 of the upper joint portion 11 and the lower joint portion 12 and further from the opening of the air valve 24. Dropped by its own weight. In that case, it is preferable to prevent clogging in the vicinity of the discharge port by injecting compressed air from the air injection nozzle 27 toward the discharge port 22 as necessary. Further, after a predetermined amount of the hydrous sand ES has been put into the covering bag 4, the upper opening of the covering bag 4 is closed. That is, in this operation, the rubber tube 35 is expanded by compressed air introduced through the supply pipe 39 and the like, and the opening of the inner ring 34 is closed by the expanded rubber tube 35 as shown in FIG. .

  In the dehydration step, the hydrated earth and sand ES put into the covering bag 4 as shown in FIG. 6 is dehydrated by sucking the inside of the casing 5 with the vacuum pump 7. In this vacuum dewatering system, when the vacuum pump 7 is driven, the water dehydrated from the hydrous sand ES in the covering bag 4 passes through a number of suction pipes 53 and connection pipes 54 to 56 to become muddy water, and a gas-liquid separator. 8 is stored in the muddy water storage tank 9 in a state where a gas such as air is separated.

  Further, in the dehydration step, it is preferable to pressurize the compressed air from the air supply nozzle 28 in the casing 5 and to the upper side of the covering bag 4 together with vacuum suction by the vacuum pump 7. In this pressurizing operation, if the upper opening of the covering bag 4 is closed by the rubber tube 35, the entire covering bag 4 is pressed downward, and thus the dehydration of the hydrous sand ES in the covering bag 4 is also promoted. Dehydration efficiency can be improved. Further, by driving the vibro hammer 14 and applying vibration to the casing 5 together with vacuum suction by the vacuum pump 7, the dewatering efficiency can be improved by promoting the dewatering of the hydrous sand ES in the covering bag 4.

  In the drawing process, as shown in FIG. 7A, the lid 51 of the casing 5 is opened, and the covering bag 4 containing the dewatered earth and sand while drawing the wire 30 by the rewinding operation of the winding drum 3 is removed from the casing 5. Pull out from the bottom opening. In this pulling-out operation, compressed air is injected from the air supply nozzle 28 as necessary, and the inside of the casing 5 is pressurized from the upper side, thereby making it easy to pull out the covering bag 4 in the earth and sand containing state from the casing 5. When the sandbag SD is not created, for example, the lid 51 is opened from the state of FIG. 6 and the bottom portion of the covering bag 4 is cut, or the bottom portion of the covering bag 4 is pulled out from the drawn state of FIG. The dewatered earth and sand in the covering bag 4 will be collect | recovered by cutting | disconnecting.

  In the separation step, as shown in FIG. 7 (b), the covering bag 4 containing the earth and sand is cut into a sandbag 40 having a predetermined length in the earth and sand containing state and divided. Thereafter, in the dividing surface sealing step, the dividing surface of the sandbag 40 is sealed with the sealing bodies 42 and 43 described above. In this step, for example, when the sealing body 45 of FIG. 4B is used, the cutting portion can be quickly sealed, so that when the covering bag 4 is cut, the earth and sand in the bag is removed from the cutting portion. Although it protrudes, it becomes easy to minimize the amount of protrusion.

  Note that the above embodiments do not limit the present invention. The present invention only has to include the components specified in each claim, and the details can be variously changed and developed as necessary. In particular, the structure for supporting the casing and the covering bag, the structure for raising and lowering the attachment up and down, the structure for sealing the end face opening obtained by dividing the covering bag, and the like can be appropriately changed.

1. Leader (support means)
2 ... Hopper 3 ... Winding drum (30 is wire)
4 ... Coating bag (40 is a sandbag)
5 ... Case (51 is lid, 52 is suction hole)
6 ... Bucket 7 ... Vacuum pump 8 ... Gas-liquid separator 9 ... Mud storage tank 13 ... Vibro hammer (vibrator)
14 .... Shock absorber 24 ... Air valve 28 ... Air supply nozzle (pressurizing means)
32 .... Holder 33 ... Outer ring 34 ... Inner ring 35 ... Rubber tube (opening / closing means)
37 ... Connector 38 ... Supply pipe 40 ... Soil bag 41 ... Sealing body 42 ... Sealing body 43 ... Sealing body 45 ... Sealing body 53... Suction tube 54... Connection tube 55... Connection tube 56.
SD ...

Claims (7)

A method for dewatering water-containing earth and sand that dehydrates high-water-content earth and sand by suction action due to the negative pressure of a vacuum pump to reduce the water content,
In a state where the casing is held vertically or at a predetermined inclination angle, water-containing earth and sand to be treated is introduced and accommodated from the upper opening into a water-permeable cylindrical covering bag arranged in the up and down direction inside the casing, and then around the casing. A dewatering method for hydrous soil, wherein the hydrous sand in the covering bag is dehydrated by sucking the inside of the casing from the numerous suction holes provided by the vacuum pump.   2. The method for dewatering a hydrous soil according to claim 1, wherein the casing is vibrated together with vacuum suction by the vacuum pump.   The method for dehydrating water-containing earth and sand according to claim 1 or 2, wherein the vacuum pump suctions and pressurizes compressed air inside the casing together with vacuum suction.   A substantially cylindrical holder mounted on an upper end side of the covering bag; and opening / closing means disposed inside the holder; 4. The method for dewatering hydrous soil according to claim 3, wherein the upper opening of the is switched to a closed state.   5. After the dehydration treatment, the covering bag in a state in which soil is contained is pulled out from the lower opening of the casing, divided into a predetermined length, and the divided surface is covered. Method for dehydration of hydrous soil. A dewatering device for hydrous soil that dehydrates high-moisture-content soil and sand by suction action due to the negative pressure of a vacuum pump to reduce the moisture content,
A casing that is held at a vertical or predetermined inclination angle by the support means, has a plurality of suction holes provided around the casing, and can open and close the upper and lower ends; and
A hopper for charging earth and sand connected to the upper side of the casing;
A water-permeable cylindrical covering bag that is arranged in the vertical direction inside the casing and can receive the target hydrous sand from the upper opening through the hopper;
An apparatus for dewatering hydrous earth and sand, comprising a suction pipe attached to the suction hole and connected to the suction side of the vacuum pump.   The water content according to claim 6, further comprising a pressurizing means for introducing compressed air into the casing and an upper side of the covering bag, and / or a vibrator for applying vibration to the casing. Sediment dewatering equipment.

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