JP2008296193A - Apparatus for dehydrating excavated earth and sand - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for dehydrating excavated earth and sand, in which the pressurizing force suitable for the throughput of the excavated earth and sand is exerted on the excavated earth and sand even when the throughput of the excavated earth and sand is fluctuated. <P>SOLUTION: The apparatus 1 for dehydrating excavated earth and sand is composed of a dehydration mechanism 1a and a pressurization mechanism 1b. A pressurizing belt 32 constituting the pressurization mechanism 1b is composed of: an endless inner periphery-side belt main body 37 to be arranged on the inner peripheral side; a pressurizing body 38 arranged on the outside of the inner periphery-side belt main body; and an outer periphery-side belt main body 39 which is arranged on the outside of the pressurizing body and opposed to the inner periphery-side belt main body 37 in order to put the pressurizing body 38 between them. The pressurizing body 38 is formed by blowing air as a compressible fluid in the internal space of an endless bag 41 formed from a rubber-based material and arranging a plurality of partition walls 40 for partitioning the internal space in the internal space along the circulation direction of the pressurizing belt 32. <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 solid matter moving on the mesh belt is sandwiched between pressing belts that rotate by synchronous rotation, and is pressed and pressed from above the pressing belt with a pressing roller, thereby improving the efficiency of dehydration. 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 has an endless inner circumferential belt body disposed on the inner circumferential side, a pressure body disposed outside the inner circumferential belt body, and disposed outside the pressure body. A pressurizing body is constituted by an outer peripheral belt body sandwiched between the inner peripheral belt main body and the pressurizing body is constituted by enclosing a compressible fluid in an endless bag.

  In the excavating earth and sand dewatering device according to the present invention, a plurality of partition walls partitioning the inner space of the endless bag body are arranged in the inner space along the circulation direction of the pressure belt.

  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.

  The excavated earth and sand dewatering device according to the present invention includes a pair of endless bags in which the endless bag body is disposed opposite to the inner peripheral belt main body, the outer peripheral belt main body, and edges thereof joined to each other. It is composed of strips.

  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 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 of the present invention is configured to sandwich the pressure body between the inner peripheral belt body and the outer peripheral belt body, and the pressurizing body, A compressible fluid is sealed in an endless bag.

  In this way, when the forced deformation that reduces the distance between the inner peripheral belt body and the outer peripheral belt body acts on the pressure belt, the compressive fluid enclosed in the endless bag is compressed and the internal pressure is reduced. The reaction force corresponding to the internal pressure is generated in the direction opposite to the direction of forced deformation.

  For this reason, if the amount of excavated sediment increases and the thickness on the water permeable belt increases, and the forced deformation that reduces the distance between the inner and outer peripheral belt bodies acts on the pressure belt, the forced deformation A reaction force corresponding to the size of the drilling works on the excavated soil.

  That is, as the distance between the inner peripheral belt body and the outer peripheral belt body becomes narrower, the degree of compression of the compressive fluid increases and the reaction force increases. The pressurizing force acting on the soil also increases, and thus a pressure of a magnitude commensurate with the amount of excavated soil is increased.

  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.

  The specific structure of the pressurizing body is arbitrary as long as the compressible fluid is sealed in the endless bag body, but the partition wall that partitions the inner space of the endless bag body extends along the circulation direction of the pressurizing belt. If a plurality of the fluids are arranged in the internal space, the local movement of the compressive fluid along the circulation direction of the pressure belt is prevented. Therefore, even when the thickness of the excavated soil on the permeable belt is not uniform along the transport direction due to the amount of sediment supplied, etc., the pressure corresponding to the thickness is applied to the excavated sediment. Can do.

  In addition, as a structure of a pressurization body, you may make it share an inner peripheral side belt main body and an outer peripheral side belt main body in a part of endless bag body. That is, the endless bag body can be composed of an inner peripheral belt main body, an outer peripheral belt main body, and a pair of endless belt members that are arranged so as to face each other.

  How to support the pressure from the pressure belt acting on the water permeable belt is arbitrary. For example, a reaction force member is provided on the back side of the water permeable belt so as to be slidable with the back surface of the water permeable belt. If it arrange | positions, it will become possible to make the pressure from a pressurization belt act on excavation earth and sand without disturbing a movement of a water-permeable belt, and it will become possible to further improve the improvement of the dewatering efficiency by pressurization.

  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 the head pulley 4 which is the first head pulley and the tail pulley 5 which is the first tail pulley, and circulates between both pulleys by the drive motor 31 installed on the 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 FIGS. 2 and 3, the water permeable belt 2 is composed of a mesh belt main body 3 and wave bars 23 and 23 erected on both edges thereof. Serves as a side guard to prevent spills 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, a pressure member 38 disposed on the outer side of the inner peripheral belt body, The outer peripheral side belt main body 39 is disposed outside the pressure body and sandwiches the pressurizing body 38 with the inner peripheral side belt main 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 pressurizing body 38 is configured by enclosing air as a compressible fluid in an endless bag body 41 and arranging a plurality of partition walls 40 partitioning the internal space in the internal space along the circulation direction of the pressurizing belt 32. It is.

  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, a belt conveyor 15 that functions as a supply feeder is disposed below the hopper 14, and the excavation that has been input to the hopper 14 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 (start point of the transfer section A).

  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.

  Therefore, dehydration of the excavated earth and sand 57 is promoted by the pressurizing action by the pressurizing mechanism 1b. And the excavated earth and sand from which the moisture content has been reduced and the water content ratio has been lowered are carried out to the left side in FIG.

  Here, the pressurizing belt 32 sandwiches the pressurizing body 38 between the inner peripheral side belt main body 37 and the outer peripheral side belt main body 39, and the air is supplied to the inner space of the endless bag body 41. A plurality of partition walls 40 that enclose and partition the internal space are arranged in the internal space along the circulation direction of the pressure belt 32.

  Therefore, when forced deformation that reduces the distance between the inner peripheral belt body 37 and the outer peripheral belt body 39 acts on the pressure belt 32, the air enclosed in the inner space in the endless bag body 41 is compressed. As a result, the internal pressure increases, 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 is increased and the thickness on the water permeable belt 2 is increased, and the forced deformation in which the distance between the inner peripheral belt main body 37 and the outer peripheral belt main body 39 is reduced acts on the pressure belt 32. The reaction force having a magnitude corresponding to the magnitude of the forced deformation 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 is configured by sandwiching the pressure body 38 between the inner peripheral belt main body 37 and the outer peripheral belt main body 39. In addition, since the pressurizing body is configured by enclosing the endless bag body 41 with air, the degree of compression of the air becomes smaller as the distance between the inner circumferential belt body 37 and the outer circumferential belt body 39 becomes narrower. Thus, the reaction force increases, and as the processing amount of the excavated sediment 57 increases, the applied pressure acting on the excavated sediment 57 can be increased.

  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.

  Moreover, according to the dewatering apparatus 1 for excavated earth and sand according to the present embodiment, the plurality of partition walls 40 that partition the inner space of the endless bag body 41 are arranged in the inner space along the circulation direction of the pressure belt 32. The local movement of the air in the bag 41 is prevented. Therefore, even if the thickness of the excavated soil on the water-permeable belt 2 becomes non-uniform along the transport direction due to the amount of supplied soil and the like, a pressure corresponding to the thickness is applied to the excavated sediment. It becomes possible.

  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.

  In the present embodiment, the endless bag according to the present invention has an independent configuration different from the inner peripheral belt main body and the outer peripheral belt main body, but instead, the inner peripheral belt main body and the outer peripheral belt. A part of the main body may be used also as a part of the endless bag.

  FIG. 6 shows a pressure belt 32a according to a modified example. The pressure belt 32a includes an inner peripheral belt main body 37 and a pressurizing body 38a disposed outside the inner peripheral belt main body. And an outer peripheral belt body 39 that is disposed outside the pressurizing body and sandwiches the pressurizing body 38a with the inner peripheral belt main body 37. The pressurizing body 38a includes the inner peripheral belt main body 37, Air is sealed in the inner space of the endless bag body composed of the outer peripheral side belt main body 39 and a pair of endless belt members 61 and 61 which are joined to and opposed to each of the edge portions, and partitions the inner space. A plurality of partition walls 40 are arranged in the internal space along the circulation direction of the pressure belt 32.

  Even in such a configuration, the same effects as the present embodiment are obtained, but the description thereof is omitted here.

  In the present embodiment, the internal space of the endless bag body 41 is partitioned by the partition wall 40 to prevent local movement of the air in the endless bag body 41. In other words, if the fluctuation of the thickness of the excavated earth and sand varies from moment to moment, the difference in thickness on the permeability belt 2 is ignored. In this case, it is not necessary to prevent the local air flow caused by the partition 40.

  In such a case, the partition wall 40 may be omitted. FIG. 7 shows a pressurizing body 38b formed by enclosing air as a compressible fluid in an endless bag body 41. As shown in FIG.

  Even in such a configuration, as in the embodiment, as the distance between the inner peripheral belt main body 37 and the outer peripheral belt main body 39 decreases, the degree of air compression increases and the reaction force increases. As the throughput increases, the applied pressure acting on the excavated sediment can be increased. Since other configurations and operational effects are the same as those of the above-described embodiment, description thereof is omitted here.

  Although not particularly mentioned in the present embodiment, a water absorbing body 81 may be provided outside the outer peripheral belt body 39 as shown in FIG.

  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.

1 is an overall view of a dehydrating apparatus 1 according to the present embodiment. 3 is a detailed cross-sectional view of the water permeable belt 2 and the pressure belt 32. FIG. Sectional drawing which follows the AA 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 detail figure which showed the pressurization body 38b which concerns on a modification. FIG. 3 is a detailed cross-sectional view showing a water absorbing body 81.

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 Pressure belt 33 Head pulley (second head pulley)
34 Tail pulley (second tail pulley)
35 Traveling angle adjusting roller 36 Pressure roller 37 Inner circumferential side belt main body 38, 38a, 38b Pressurizing body 39 Outer circumferential side belt main body 40 Partition 41 Endless bag body 52 Reaction force member 61 Endless belt material 81 Water absorbing body

Claims (5)

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 the 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 has an endless inner circumferential belt body disposed on the inner circumferential side, a pressure body disposed outside the inner circumferential belt body, and disposed outside the pressure body. The pressurizing body is constituted by an outer peripheral belt body sandwiched between the inner peripheral belt main body and the pressurizing body is configured by enclosing a compressible fluid in an endless bag. Drilling earth and sand dewatering equipment. The dewatering device for excavated earth and sand according to claim 1, wherein a plurality of partition walls partitioning the internal space of the endless bag body are arranged in the internal space along the circulation direction of the pressure belt. The dewatering device for excavated earth and sand according to claim 1, 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. 2. The excavated earth and sand according to claim 1, wherein the endless bag body is composed of the inner peripheral belt body, the outer peripheral belt body, and a pair of endless belt members each having an edge joined to each other and disposed opposite to each other. Dehydration equipment. The dewatering device for excavated earth and sand according to any one of claims 1 to 4, wherein a water absorbing body is provided outside the outer peripheral belt body.

Images