JP2009006340A - Dewatering device for excavated soil sand - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dewatering device where, even if the amount of the excavated soil sand to be treated is varied, suitable pressurizing force according to the quantity to be treated is acted on the excavated soil sand. <P>SOLUTION: The dewatering device 1 for excavated soil sand is composed of: a dewatering mechanism 1a; and a pressurizing mechanism 1b. The pressurizing belt 32 composing the pressurizing mechanism 1b is provided with: an endless inner circumferential side belt body 37 arranged at the inner circumferential side; and a pressurizing body 38 arranged at the outside of the inner circumferential side belt body. In the pressurizing body, a plurality of bag bodies 60 sealed with air as a compressible fluid are arranged along the circulation direction of the inner circumferential side belt body 37. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an excavating earth and sand dewatering device for dehydrating excavated earth and sand having a high water content.

  In the mud pressure shield method, excavated earth and sand taken into the chamber of the shield machine is carried to the ground by a mud pump, a screw conveyor, a belt conveyor, etc., and stored in an earth and sand pit.

  Here, the mud pressure shield has a high moisture content of the excavated earth and sand because of the stability of the face by the mud pressure, so it is handled as industrial waste and the disposal cost is high. In addition, since a large amount of water is contained in the gaps between the soil particles, the weight per unit volume is large and the transportation cost is high. Furthermore, because of tunnel excavation, the amount of excavated sediment is enormous.

  Here, if the excavated sediment is dried by a method such as sun drying, the moisture content will decrease and it can be used as general residual soil, but securing a vast site for sun drying in urban areas is not possible. Not realistic. In addition, if the water content ratio is reduced and the strength is improved by adding cement-based materials such as lime, it can be reused as construction materials. The material cost and the work cost for the addition become high, and it is difficult to apply in terms of economy, coupled with securing the processing site. Moreover, since the pH increases due to the addition of cement-based materials, disposal as general residual soil may be difficult.

  For this reason, various attempts have been made in the past to efficiently reduce the volume and weight of excavated sediment.

JP-A-9-206759 Japanese Patent Laid-Open No. 7-214094 Japanese Utility Model Publication No. 6-66890

  For example, Patent Document 1 discloses a vacuum suction-type dewatering conveyor that includes a mesh belt and a vacuum unit that forcibly vacuum-sucks from the lower side of the mesh belt. According to the vacuum suction-type dewatering conveyor, It is stated that the initial cost of the dehydrator can be reduced.

  In addition, in the invention described in the same document, the efficiency of dehydration is improved by sandwiching the solid material that moves on the mesh belt between the pressing belts that rotate by synchronous rotation, and pressing and pressing the pressing belt from above the pressing belt. Is planned.

  However, since such a pressing roller is normally pivotally supported by the gantry, the separation distance from the mesh belt is always constant. Therefore, when the processing amount of the excavated earth and sand to be dewatered fluctuates, there arises a disadvantage that the excavated earth and sand cannot be pressurized with a certain size.

  In other words, if the amount of excavated earth and sand to be dewatered is small, the thickness of the earth and sand on the mesh belt is small, so almost no pressure action from the holding belt can be expected. Has a problem that the thickness of the earth and sand is too large, and the excavated earth and sand is blocked between the mesh belt and the holding belt, thereby hindering the normal operation of the conveyor.

  The present invention has been made in consideration of the above-described circumstances, and even when the processing amount of the excavated sediment varies, the dewatering of the excavated soil capable of applying an appropriate pressure according to the processing amount to the excavated sediment. An object is to provide an apparatus.

In order to achieve the above object, an excavated earth and sand dewatering device according to the present invention comprises an endless water-permeable belt stretched between a first head pulley and a first tail pulley, as described in claim 1. A dewatering mechanism comprising a suction mechanism for sucking and removing moisture in the excavated earth and sand placed thereon in the conveyance section of the water permeable belt,
The second head pulley and the second pulley are arranged above the dewatering mechanism so that the circulation path is opposite to the circulation path of the water-permeable belt and the circulation speed is equal to the conveyance speed of the water-permeable belt. A pressure belt comprising an endless pressure belt stretched over a tail pulley, and a pressure roller disposed on the back side of the pressure belt;
The pressure belt is composed of an endless inner circumferential belt body disposed on the inner circumferential side and a pressure body disposed on the outer side of the inner circumferential belt body. A plurality of bags enclosing a compressible fluid are arranged in parallel along the circulation direction of the inner peripheral belt body.

  In the excavating earth and sand dewatering device according to the present invention, a pair of side support pressure portions are arranged opposite to both edge portions of the inner peripheral belt body so that the bag bodies are sandwiched between both ends.

  Further, the excavating earth and sand dewatering device according to the present invention includes a plurality of intermediate support portions at a predetermined pitch so as to be parallel to the circulation direction of the inner peripheral belt body and parallel to the longitudinal direction of the bags. While standing up to an inner peripheral belt body, among the plurality of intermediate bearing parts, each bag is installed between intermediate bearing parts facing each other.

  In the excavating earth and sand dewatering device according to the present invention, an outer peripheral belt body that sandwiches the pressurizing body between the inner peripheral belt body and the outer peripheral belt body is disposed outside the pressurizing body.

  Moreover, the dewatering device for excavated earth and sand according to the present invention has a water absorbing body provided outside the outer peripheral belt body.

  In the dewatering device for excavated earth and sand according to the present invention, a reaction force member is disposed on the back side of the water-permeable belt so as to be slidable with the back surface of the water-permeable belt.

  In the excavation earth and sand dewatering apparatus according to the present invention, excavation by the suction mechanism is performed by pressurizing the excavation earth and sand placed on the conveyance surface of the water-permeable belt that constitutes the dewatering mechanism with the pressurizing belt that constitutes the pressurizing mechanism. The pressure belt according to the present invention is configured to promote the dewatering action of earth and sand, but the endless inner peripheral belt body disposed on the inner peripheral side and the outer peripheral belt main body are disposed outside the inner peripheral belt main body. The pressurizing body is formed by arranging a plurality of bag bodies filled with a compressive fluid along the circulation direction of the inner peripheral belt body.

  In this way, when the forced deformation in which the thickness of the pressure belt decreases, in other words, the forced deformation in which the height of the bag body decreases acts on the pressure belt, the compressive fluid enclosed in the bag body is The internal pressure increases due to compression, and a reaction force corresponding to the internal pressure is generated in the direction opposite to the direction of forced deformation.

  Therefore, when the amount of excavated sediment increases, the thickness on the permeable belt increases, and when the forced deformation that reduces the thickness of the pressure belt acts on the pressure belt, the amount of the forced deformation depends on the size of the forced deformation. A large reaction force acts on the excavated soil.

  In other words, as the height of the bag decreases, the degree of compression of the compressible fluid increases and the reaction force increases, so the pressure applied to the excavated sediment increases as the amount of excavated sediment increases. Thus, a pressure corresponding to the amount of excavated earth and sand is increased.

  In addition, since a plurality of bags are arranged in parallel along the circulation direction of the inner peripheral belt body, even if the thickness of excavated soil differs depending on the transport position, it becomes possible to follow the applied pressure to the thickness. That is, even if the thickness of the excavated sediment on the permeable belt becomes non-uniform along the transport direction due to the amount of sediment supplied, etc., the larger the excavated sediment thickness, the greater the applied pressure. Can be made.

  The structure of the water-permeable belt is arbitrary as long as it can pass the moisture sucked from the excavated earth and sand while supporting the load and transport load of the excavated earth and sand to be dehydrated. Can be adopted.

  The structure of the suction mechanism is arbitrary as long as moisture can be sucked and removed from the excavated earth and sand being conveyed via the water-permeable belt. For example, the suction pump, a suction pipe connected to the suction pump, and the suction pipe And a suction member having a reduced pressure space formed therein.

  As long as the pressurizing body is configured by arranging a plurality of bag bodies enclosing a compressible fluid along the circulation direction of the inner peripheral belt body, the specific configuration regarding the individual configuration and arrangement method of the bag bodies is as follows. For example, it is conceivable that each bag body is configured such that the outer shape is cylindrical, and the length thereof is approximately equal to the width of the inner peripheral belt body. Furthermore, it is conceivable that such cylindrical bag bodies are arranged side by side so that their longitudinal directions are perpendicular to the circulation direction of the inner peripheral belt body and are adjacent to each other.

  Here, if a pair of side support pressure portions are arranged opposite to both edge portions of the inner peripheral belt body so that each of the bag bodies described above is sandwiched at both ends, the thickness of the pressure belt is reduced. When the deformation is applied, the lateral expansion of each bag is restricted, and the applied pressure acting on the excavated soil is increased.

  Further, the respective bag bodies may be arranged continuously while being in contact with each other, but a plurality of bag bodies are arranged along the circulation direction of the inner peripheral belt body and parallel to the longitudinal direction of the respective bag bodies. If the intermediate bearing portions are erected on the inner peripheral belt body at a predetermined pitch, and each bag body is installed between the intermediate bearing portions facing each other among the plurality of intermediate bearing portions When the forced deformation that reduces the thickness of the pressure belt is applied, the swelling of each bag body along the circulation direction of the inner peripheral belt body is limited, and the applied pressure acting on the excavated sediment increases. .

  Pressurization to the excavated earth and sand may be performed by direct contact between the bag body and the excavated earth and sand, but the outer peripheral side belt body in which the pressurized body is sandwiched between the inner peripheral side belt main body and the pressurized body If it is arranged on the outer side, it is possible to prevent the excavated earth and sand from entering between the bag body and adversely affect the pressurizing action or damage the bag body.

  Here, if a water absorbing body is provided outside the outer peripheral belt body, the excavated soil can be dewatered also on the pressurizing mechanism side.

  How to support the pressure from the pressure belt acting on the water permeable belt through the excavated earth and sand is arbitrary. For example, the back surface of the water permeable belt can slide on the back surface of the water permeable belt. If the reaction force member is arranged on the surface, the pressure from the pressure belt can be applied to the excavated earth and sand without hindering the movement of the permeable belt, and the improvement of the dewatering efficiency due to the pressure can be further enhanced. Is possible.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a dewatering apparatus for excavated earth and sand according to the present invention will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

  FIG. 1 is a front view showing a dewatering device for excavated earth and sand according to the present embodiment. As shown in the figure, the excavated earth and sand dewatering device 1 according to the present embodiment includes a dewatering mechanism 1a and a pressurizing mechanism 1b. The dewatering mechanism 1a includes an endless water-permeable belt 2, A suction mechanism 12 that sucks and removes moisture in excavated earth and sand placed thereon in the conveyance section of the water permeable belt through the water permeable belt 2 is provided.

  The water-permeable belt 2 is passed between a head pulley 4 as a first head pulley and a tail pulley 5 as a first tail pulley, and circulates between both pulleys by a drive motor 31 installed on a mount 54. ing.

  The suction mechanism 12 includes a suction pump 10, a suction pipe 9 connected to the suction pump, and a suction member 8 that is connected to the suction pipe and has a reduced pressure space formed therein.

  As shown in FIG. 2 (a) and FIG. 3, the water-permeable belt 2 includes a mesh belt body 3 and wave bars 23 and 23 erected on both edges of the mesh belt body 3, and the wave bars are to be dewatered. It plays the role of a side guard that prevents the excavated soil from spilling during transportation.

  As can be seen in these drawings, the suction member 8 has a box cross-sectional shape, and is arranged along the conveyance direction of the water-permeable belt 2 so that the opening edge thereof is slidable with the back surface of the mesh belt body 3. In addition, a plurality of reaction force members 21 are arranged below the water-permeable belt 2 so as to be slidable on the back surface thereof.

  The reaction member 21 is arranged in parallel to the conveyance axis of the water-permeable belt 2 at a position excluding the place where the suction member 8 is arranged, and its length is set so as not to hinder the operation of the carrier roller 22. For example, it is set slightly shorter than the pitch of the carrier rollers 22 and 22. The reaction member 21 may be appropriately fixed to the gantry 54 like the suction member 8. The reaction force member 21 can be formed of ultra high molecular polyethylene having a small friction coefficient.

  As shown in FIG. 1, the pressurizing mechanism 1b is disposed above the dehydrating mechanism 1a, and is endlessly stretched between a head pulley 33 that is a second head pulley and a tail pulley 34 that is a second tail pulley. , A pair of travel angle adjustment rollers 35 and 35 for adjusting the travel angle of the pressure belt, and a pressure roller 36 disposed between the pair of travel angle adjustment rollers.

  The pressure belt 32 has a head pulley 33 and a tail pulley 34 so that the circulation path is reverse to the water permeable belt 2 (clockwise in FIG. 1) and the circulation speed is equal to the conveyance speed of the water permeable belt 2. It is hung over.

  The pair of travel angle adjusting rollers 35 and 35 adjust the travel angle of the pressure belt so that the pressure belt 32 is separated from the transport surface of the water permeable belt by a predetermined distance in the transport section of the water permeable belt 2. It has become.

  As shown in FIG. 2, the pressure belt 32 includes an endless inner peripheral belt body 37 disposed on the inner peripheral side, and a pressurizing body 38 disposed on the outer side of the inner peripheral belt main body. The pressurizing body is formed by arranging a plurality of bag bodies 60 enclosing air as a compressive fluid along the circulation direction of the inner peripheral belt body 37.

  As shown in FIG. 4, the travel angle adjusting roller 35 is configured by attaching a roller body 51 to a roller attachment body 52 and attaching the roller attachment body to a mount 54 via an adjustment screw 53. The pressure belt 32 is pressed from the back surface by the main body 51 to determine the traveling angle of the pressure belt, and the installation height of the roller main body 51 is adjusted by the adjusting screw 53, and consequently the pressure belt 32. The holding position of can be adjusted.

  The pressure roller 36 is attached to the gantry 54 via a U-shaped frame 55 and adjustment screws 56, 56. With this configuration, pressure can be loaded on the pressure belt 32 from the back surface thereof. The installation height of the U-shaped frame 55 is adjusted by the adjusting screws 56, 56, and the pressure acting position of the pressure belt 32 can be adjusted.

  The dewatering device 1 for excavating earth and sand according to the present embodiment includes a hopper 14 that inputs the excavating earth and sand, and a belt conveyor 15 that functions as a supply feeder is disposed below the excavated earth and sand. The earth and sand can be supplied to the conveyance start position of the water-permeable belt 2 constituting the dewatering mechanism 1a by the belt conveyor 15.

  In order to dewater the excavated earth and sand using the excavated earth and sand dewatering apparatus 1 according to the present embodiment, first, the excavated earth and sand to be dewatered are put into the hopper 14. Excavation sediments include all excavation sediments having a high water content ratio generated in civil engineering construction work, for example, excavation sediments generated in mud pressure shield construction. As such excavated earth and sand, for example, what has been conveyed from a belt conveyor installed on the upstream side may be put into the hopper 14.

  Next, the excavated earth and sand thrown into the hopper 14 is transferred by the belt conveyor 15, and placed on the permeable belt 2 at the transfer start position.

  Next, the suction pump 10 is driven to extract the air in the decompression space formed in the suction member 8.

  If it does in this way, the water | moisture content in excavated earth and sand will be isolate | separated from a soil particle, and will be discharged | emitted outside. Such moisture passes through the water-permeable belt 2 and further flows through the suction pipe 9 and is drained.

  On the other hand, the pressure belt 32 constituting the pressure mechanism 1b circulates at the same conveyance speed as the water permeable belt 2 and a pair of traveling angles so as to be separated from the surface of the water permeable belt 2 in the conveyance section by a predetermined distance. The running angle is adjusted by the adjustment rollers 35 and 35.

  Therefore, as shown in FIG. 4, the excavated earth and sand 57 is conveyed while being sandwiched between the pressure belt 32 and the water-permeable belt 2 and is disposed between the pair of travel angle adjusting rollers 35 and 35 during the conveyance. The pressure roller 36 is pressed. Then, the excavated sediment 57 is dewatered by the pressurizing action of the pressurizing mechanism 1b, and the excavated sediment with the moisture removed and the water content ratio lowered is carried out to the left side in FIG. The

  Here, the pressure belt 32 is composed of an endless inner circumferential belt body 37 disposed on the inner circumferential side, and a pressure body 38 disposed outside the inner circumferential belt body. The pressurizing body is formed by arranging a plurality of bag bodies 60 filled with air along the circulation direction of the inner peripheral belt body 37.

  In this way, when forced deformation in which the thickness of the pressure belt 32 decreases, in other words, forced deformation in which the height of the bag body 60 decreases acts on the pressure belt 32, the pressure belt 32 is enclosed in the bag body 60. Air is compressed to increase the internal pressure, and a reaction force corresponding to the internal pressure is generated in the direction opposite to the direction of forced deformation.

  Therefore, when the amount of excavated sediment increases, the thickness on the water permeable belt 2 increases, and the forced deformation in which the thickness of the pressure belt 32 decreases acts on the pressure belt, the magnitude of the forced deformation is increased. A reaction force of a corresponding magnitude acts on the excavated soil.

  FIG. 5 is a view showing a state in which a reaction force is generated in the pressure belt 32 due to forced deformation by the excavated earth and sand 57. FIG. 5 (a) shows the pressurization because the processing amount of the excavated earth and sand 57 is relatively small. The case where the reaction force of the belt 32 becomes small is shown, and FIG. 5B shows the case where the reaction force of the pressure belt 32 becomes large because the processing amount of the excavated earth and sand 57 is relatively large.

  As described above, according to the excavated earth and sand dewatering device 1 according to the present embodiment, the pressure belt 32 includes the inner circumferential belt body 37 and the pressure body 38 disposed outside the inner circumferential belt body. Since the pressurizing body is configured by arranging a plurality of bag bodies 60 in which air is sealed outside the inner peripheral belt body along the circulation direction of the inner peripheral belt body 37. As the thickness of the pressure belt 32 decreases, the degree of air compression generated in the bag body 60 increases and the reaction force increases. Thus, as the processing amount of the excavated soil 57 increases, It is possible to increase the pressure applied to the earth and sand.

  Therefore, even if the processing amount of the excavated earth and sand 57 varies every day or changes every moment due to shield construction or the like, if the amount of the excavated earth and sand 57 is small (FIG. 5 (a)), a relatively small pressure is applied. When the pressure belt 32 acts on the excavated sediment 57 and the amount of the excavated sediment 57 is large (FIG. 5 (b)), a relatively large pressure acts on the excavated sediment 57 from the pressure belt 32. Regardless of the amount of earth and sand treated, uniform dehydration is possible.

  Further, according to the dewatering device 1 for excavated earth and sand according to the present embodiment, since a plurality of bags 60 are arranged in parallel along the circulation direction of the inner peripheral belt body 37, the thickness of the excavated earth and sand 57 varies depending on the transport position. Even if different, it is possible to follow the applied pressure to the thickness, and thus, the thickness of the excavated sediment on the water-permeable belt 2 becomes non-uniform along the transport direction due to the supply amount of sediment. However, a greater applied pressure can be applied to the portion where the thickness of the excavated soil is larger.

  Although not particularly mentioned in the present embodiment, as shown in FIG. 6, a pair of sides forming a plate shape on both edges of the inner peripheral belt body 37 so that each bag 60 is sandwiched between both ends thereof. It is good also as the pressurization belt 32a formed by opposingly arranging the direction support pressure parts 71 and 71. FIG.

  According to such a configuration, when forced deformation that reduces the thickness of the pressure belt 32a is applied, the lateral expansion of each bag 60 is limited, and thus the pressure acting on the excavated earth and sand 57 is reduced. It becomes possible to enlarge.

  In the present embodiment, the bag bodies 60 are continuously arranged while being in contact with each other. However, instead of this, a modification example shown in FIG.

  The pressurizing belt 32b shown in the figure includes the pair of side support portions 71 and 71 described with reference to FIG. 6 and a longitudinal direction of each bag 60 along the circulation direction of the inner peripheral belt body 37. A plurality of intermediate bearing portions 72 having a plate shape are erected on the inner peripheral belt body 37 so as to be parallel, and among the plurality of intermediate bearing portions 72, intermediate bearing portions 72, 72 facing each other. Each bag body 60 is installed between the two.

  According to such a configuration, when forced deformation in which the thickness of the pressure belt 32b is reduced acts, the swelling of each bag body 60 along the circulation direction of the inner peripheral belt body 37 is limited, and the excavated earth and sand The pressurizing force acting on 57 becomes larger than that of the modification shown in FIG.

  The intermediate bearing portions 72 are joined to the lateral bearing portions 71 and 71 at both ends so that the bulge of each bag body 60 along the circulation direction of the inner peripheral belt body 37 can be suppressed. Therefore, it is desirable to increase the bending rigidity in the circulation direction.

  On the other hand, the intermediate bearing part 72 is not necessarily used together with the side bearing parts 71, 71, and can be provided independently from the side bearing parts 71, 71. 71 may be omitted and only the intermediate bearing portion 72 may be provided.

  In the present embodiment, the pressure is applied to the excavated earth and sand by direct contact between the bag body 60 and the excavated earth and sand 57, but a modification shown in FIG. 8 may be used instead.

  The pressurizing belt 32c shown in the figure is pressed between the inner peripheral belt body 37 in addition to the pair of side support pressure portions 71 and 71 and the intermediate support pressure portion 72 described with reference to FIGS. An outer peripheral belt body 73 sandwiching the body 38 is disposed outside the pressure body.

  According to such a configuration, it is possible to prevent the excavated earth and sand 57 from entering between the bag bodies 60 and 60 to adversely affect the pressurizing action or damage the bag body 60 in advance.

  Here, as shown in FIG. 9, a water absorbent 74 may be provided outside the outer peripheral belt body 73. According to such a configuration, the excavated soil can be dewatered not only on the dewatering mechanism 1a but also on the pressurizing mechanism 1b side.

  Although not particularly mentioned in the present embodiment, the excavated earth and sand dewatering device according to the present invention may be used as a belt conveyor. In this case, the lengths of the water-permeable belt 2 and the pressure belt 32 may be appropriately adjusted according to the required transport distance.

  In this connection, as a form of use of the excavation earth and sand dewatering device according to the present invention, as a belt conveyor, as a dewatering device for excavated earth and sand that constitutes a continuous bellcon with other belt conveyors, it is appropriately disposed between the belt conveyors. In other words, it is conceivable to use it as a stationary type dewatering device for excavated soil.

1 is an overall view of a dehydrating apparatus 1 according to the present embodiment. It is detail drawing, (a) is sectional drawing of the water-permeable belt 2 and the pressure belt 32 orthogonal to a conveyance direction (circulation direction), (b) is sectional drawing which follows an AA line. Sectional drawing which follows the BB line of FIG. FIG. 3 is a detailed view showing a running angle adjustment roller 35 and a pressure roller 36. The figure which showed the effect | action of the dehydration apparatus 1 which concerns on this embodiment. The detailed sectional view showing pressure belt 32a concerning a modification. The detailed sectional view showing pressurization belt 32b concerning a modification. The detailed sectional view showing pressurization belt 32c concerning a modification. FIG. 7 is a detailed cross-sectional view showing a water absorbing body 74.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavating earth and sand dewatering device 1a Dewatering mechanism 1b Pressurizing mechanism 2 Permeable belt 4 Head pulley (first head pulley)
5 Tail pulley (first tail pulley)
8 Suction member 9 Suction tube 10 Suction pump 12 Suction mechanism 32, 32a, 32b, 32c Pressure belt 33 Head pulley (second head pulley)
34 Tail pulley (second tail pulley)
35 Traveling angle adjustment roller 36 Pressure roller 37 Inner circumference side belt main body 38 Pressure body 52 Reaction force member 60 Bag body 71 Side support part 72 Intermediate support part 73 Outer side belt body 74 Water absorbing body

Claims (6)

An endless permeable belt stretched between a first head pulley and a first tail pulley, and moisture in excavated earth and sand placed thereon in a conveyance section of the permeable belt. A dehydration mechanism comprising a suction mechanism for suction and removal via
The second head pulley and the second pulley are arranged above the dewatering mechanism so that the circulation path is opposite to the circulation path of the water-permeable belt and the circulation speed is equal to the conveyance speed of the water-permeable belt. A pressure belt comprising an endless pressure belt stretched over a tail pulley, and a pressure roller disposed on the back side of the pressure belt;
The pressure belt is composed of an endless inner circumferential belt body disposed on the inner circumferential side and a pressure body disposed on the outer side of the inner circumferential belt body. A dewatering device for excavated earth and sand, comprising a plurality of bags enclosing a compressive fluid arranged side by side along the circulation direction of the inner peripheral belt body. The dewatering device for excavated earth and sand according to claim 1, wherein a pair of side support portions are disposed opposite to both edge portions of the inner peripheral belt body so that each bag is sandwiched between both ends. A plurality of intermediate bearing portions are erected at a predetermined pitch along the circulation direction of the inner peripheral belt main body and parallel to the longitudinal direction of the bags, and the plural The dewatering device for excavated earth and sand according to claim 1, wherein each of the bags is installed between the intermediate bearing portions facing each other. The dewatering device for excavated earth and sand according to any one of claims 1 to 3, wherein an outer peripheral side belt main body sandwiching the pressurizing body between the inner peripheral side belt main body and the outer peripheral side pressurizing body is disposed. The excavation earth and sand dewatering device according to claim 4, wherein a water absorbing body is provided outside the outer peripheral belt body. The dewatering device for excavated earth and sand according to any one of claims 1 to 5, wherein a reaction force member is disposed on the back side of the water-permeable belt so as to be slidable with the back surface of the water-permeable belt.

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