JP2001132014A - Earth and sand supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth and sand supply apparatus, capable of surely carrying earth and sand supplied to the inside of earth and sand hopper out of an earth and sand outlet in spite of condition, quality or the like of the earth and sand and preventing the cross-linking retention of the earth and sand inside thereof. SOLUTION: A cross-linking preventing device 50 for preventing cross-linking of earth and sand in a front wall surface 20a of an earth and sand storing section 20 is provided to the inside of the earth and sand storing section 20 in an earth and sand hopper 7. The cross-linking prevention device 50 has a pivot 51 placed in the direction of conveyance by a carry-in conveyor 9 in the earth and sand storing section 20, the pivot 51 is driven rotationally by a hydraulic motor 52 mounted to the rear wall surface 20b of the earth and sand storing section 20, the required number of stirring wings 54 having a circular or a square cross section even specific angles in the circumferential direction at a specific pitch interval in the direction of an axis are mounted on the circumferential surface of the pivot 51, and one or more stirring wings 55 located nearest to the front wall surface 20a among the stirring wings are constituted to display function for conveying earth and sand to an opposite direction from the other stirring wings 54.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil improvement machine for improving the quality of earth and sand generated by, for example, excavation or the like so as to meet a predetermined purpose, and to a earth and sand supply device mounted on other machines.

[0002]

2. Description of the Related Art In burial of gas pipes, water and sewage works, and other road works, excavated portions are to be backfilled. Excavations must be backfilled with soil. In addition, in foundation works and the like, soil improvement is performed by excavating soil at a site to a predetermined depth and inserting high-quality soil in place of the excavated soil. Therefore, the soil generated at various construction sites is very soft, such as clayey soil with an extremely small particle size and high viscosity, or soil that is too hard to solidify due to excessive weathering. In the case where the soil cannot be used as backfill soil, a soil quality improvement treatment such as mixing the soil with a soil improvement material mainly composed of lime, cement, etc., and solidifying the soil is performed. In recent years, construction methods for converting natural soil into reusable resources as backfill soil have become widespread.

[0003] Soil improvement treatment for solidifying the earth and sand, such as backfilling of excavated soil and strengthening the ground, and for imparting other properties to the earth and sand, is performed by mixing earth and sand with the soil improvement material. However, there are a batch method and a continuous method as a mixing method of the earth and sand and the soil improvement material. In the batch type, the earth and sand and the soil improving material are put into a stirring vessel, and the earth and sand and the soil improving material are uniformly stirred by a stirring means provided in the stirring vessel. Take out the improved soil generated from. On the other hand, as a continuous soil improvement machine, a mixing system using a screw-type stirring means and a crushing system equipped with a rotary impactor have been conventionally known. The mixing method uses a mixer provided with a screw-type stirring means in the tank, and the stirring means provided in the mixer is extended horizontally with respect to the tank, so that the earth and sand put into the tank can be mixed. It is configured to be transferred horizontally while stirring and mixing with the soil improvement material. By installing a supply section for soil and soil improvement material on one end of the tank and installing a discharge section for improved soil on the other side, soil quality improvement processing can be performed continuously. In addition, the crushing type soil improvement machine is provided with a crusher composed of a rotary hitter, and the earth and sand and the soil improvement material are dropped from the upper position toward the rotary hitter, and the rotary hitter is used in the meantime. By rotating, the soil and the soil improvement material are hit and broken to mix the soil and the soil improvement material.

[0004] In performing a continuous treatment, it is necessary to continuously supply earth and sand to be treated as a mixer or a crusher. For this reason, the transportation of the earth and sand is performed by the conveyor means. Moreover, in order to keep the amount of sediment continuously conveyed by the conveyor means unchanged,
The earth and sand hopper is connected to the conveyor means to store a certain amount of earth and sand in this earth and sand hopper, and to replenish the earth and sand in the earth and sand hopper every time the amount of earth and sand decreases to a certain extent. General. Then, the supply of the earth and sand into the earth and sand hopper is performed using a bucket or the like of a hydraulic shovel.

[0005]

As the earth and sand supply device provided for the soil improvement treatment and the like, the earth and sand to be treated has various properties and states. For example, sandy soil with a high sand content and a low degree of adhesion may be treated, and clay, dewatered cake, and the like having an extremely small particle size and high adhesion are also targets for the treatment. Since the earth and sand hopper has an earth and sand discharge port opened in a part of the accommodation space having four wall surfaces, the earth and sand conveyed by the conveyor means is blocked at portions other than the earth and sand discharge port. Then, despite the fact that the sediment is dammed on the wall surface, since the subsequent sediment is conveyed by the conveyor means and pressed, the direction in which the sediment rises along the opening wall surface of the sediment hopper with pressure from behind. Will be moved to. Regardless of the sandy soil with a small degree of adhesion, clay soil and sand with a high moisture content, when attached to the inner surface of the sand hopper, become in a close contact state and easily Does not peel. Therefore, the earth and sand continuously conveyed by the conveyor means is pressed so as to be in close contact with the wall surface around the earth and sand discharge port on the inner surface of the earth and sand hopper. In this way, the subsequent sediment is further pressed against the sediment that adheres to the wall, and becomes compacted,
As time elapses, the compacted soil gradually grows around the sediment discharge port, and eventually stays in a bridge state around the sediment discharge port. As a result, in the earth and sand hopper, the volume available as a storage area for earth and sand will be reduced by the area where the earth and sand stays due to the bridge,
The conveying amount is reduced by the conveyor means. Further, when the cross-linked area becomes large, the conveyer means stops the earth and sand from being transported. Therefore, when the earth and sand are crosslinked to some extent, the bridged state must be released by inserting a scraper from the outside into the earth and sand hopper. In particular, in the case of treating highly viscous earth and sand, there is an inconvenience that the work of releasing the bridge state must be frequently performed. Also, once the soil has been compacted, simply releasing the cross-linking state still results in a large mass of earth and sand, so that the earth and sand carry-out port may be blocked by the earth and sand. Therefore, it is necessary not only to release the cross-linked state but also to disintegrate the earth mass. As described above, the work of releasing the bridge between the soil and the sand is extremely troublesome, and the operation is prolonged, resulting in a problem that the working efficiency is reduced by that much.

The present invention has been made in view of the above points, and an object of the present invention is to ensure that the earth and sand supplied into the earth and sand hopper can be reliably discharged from the earth and sand discharge port regardless of the state and properties of the earth and sand. The purpose is to prevent earth and sand from being retained inside the bridge by carrying out the soil.

[0007]

In order to achieve the above-mentioned object, the present invention relates to a conveyor having a frame-like member having an upper end opened as an inlet for earth and sand and containing a predetermined amount of earth and sand. A soil and sand hopper provided with a sediment storage section having a sediment discharge port formed on the wall surface on the downstream side in the direction of transport of the sediment by sand is installed on the conveying path of the conveyor means, and the sediment loaded into the sediment hopper is conveyed from the sediment discharge port to the conveyor. A sediment supply device that continuously carries out the sediment by means, wherein the sediment storage unit is provided with a cross-linking prevention unit for preventing sediment accumulated therein from being cross-linked at the sediment discharge port. It is a feature.

Here, when the earth and sand put into the earth and sand hopper is sieved in advance to remove foreign matter,
Individuality may be applied so as to be directly charged, but in such a case, a sieve for separating sediment and solid foreign matter is installed at the inlet of the sediment storage unit. Then, in order to further promote the separation of the earth and sand from the solid foreign matter, it is desirable to apply a force such as vibration to the material put on the sieve, such as a vibrating sieve or a roll screen sieve.

[0009] As a configuration of the bridge preventing means, it is desirable to cut and mix the earth and sand in the entire earth and sand storage part.
Therefore, as a specific configuration of the bridging prevention means, for example, a drive shaft arranged to cover the entire length of the earth and sand transporting direction in the soil and sand storage section, a rotation drive means for rotating this drive shaft, and an outer periphery of the drive shaft And a plurality of stirring blades provided on the surface at predetermined angles. This cross-linking prevention means may be provided at one location substantially at the center of the earth and sand storage part, or may be provided at a plurality of locations such as two locations on the left and right. In addition, the stirring blade may be disposed only on the inner surface of the earth and sand hopper where the earth and sand discharge port is formed and in the vicinity thereof. When the stirring blade is configured to generate a swirling flow in the earth and sand in the earth and sand storage part, not only the prevention of cross-linking but also the function of promoting the removal from the earth and sand discharge port is exhibited. Therefore, for example, if a configuration is adopted in which the blade is continuously inclined in the axial direction from the root of the stirring blade toward the tip end, a swirling flow can be generated in the earth and sand. And this stirring blade can be comprised so that a part of the front-end | tip side may provide the bending part which has a predetermined angle further toward an axial direction. At the formation position of the earth and sand discharge port of the earth and sand storage frame, since the adhesion of the earth and sand to the wall surface becomes more remarkable, at least one of the stirring blades is inclined in the opposite direction to the other stirring blades, or is orthogonal to the axis of the rotating shaft. When installed in such a direction as to face the earth, the earth and sand can be more reliably cut and broken for the purpose of stirring the earth and eliminating the bridging state. The shape of the stirring blade is a round bar, a square bar, a plate, or the like.
In addition, the stirring blade is detachably mounted on the drive shaft to replace and use the stirring blade according to the properties and condition of the earth and sand to be treated, and to replace the worn stirring blade with a new stirring blade. It is desirable that

[0010] The stirring blades constituting the cross-linking prevention means are used for breaking down and stirring the earth and sand in the earth and sand hopper. Therefore, it is desirable that the stirring blades can be turned over as necessary. For this purpose, the rotation drive means of the drive shaft may be configured to be capable of normal and reverse rotation. If the rotary drive means is constituted by a variable speed motor and the drive torque detecting means is additionally provided, it is possible to maintain an optimal operating state according to the nature and condition of the earth and sand. Here, the rotation driving means can be constituted by an electric motor or the like,
When the operation of the machine on which the earth and sand supply means is installed is performed by a hydraulic system, it is preferable that the machine be configured by a hydraulic motor.

When the earth and sand is introduced into the earth and sand storage section by a bucket or the like of a hydraulic shovel, it is desirable to make the earth and sand inlet as wide as possible. For this purpose, for example, it is possible to adopt a configuration in which the lower side of the earth and sand storage section is formed in a square shape, and the upper side is formed into an inclined surface shape that expands obliquely outward. If the slope portion is provided in the soil storage section in this manner, the viscous soil may adhere and stay. To this end, an elastic sheet is provided on the inner surface of at least the slope-shaped portion of the earth and sand storage frame, and in order to float the elastic sheet from the inner surface of the earth and sand storage part, frame-shaped ribs are provided at predetermined pitch intervals in the vertical direction. It is desirable to adopt a configuration in which is provided.

The earth and sand supply device of the present invention can be installed, for example, in a soil improvement machine. In this case, the conveyor means is provided with a soil improving material hopper on the upstream side in the conveying direction of the earth and sand, and the end of the conveyor means on the upstream side in the conveying direction is a screw type for mixing the soil and the soil improving material. Is connected to a mixing device including a mixing device provided with a stirring device and a crusher provided with a rotary hitting element.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. Here, in the following description, it was configured as a self-propelled soil improvement machine, and the mixer was configured to continuously stir and mix the soil and soil improvement material using a paddle mixer. Can be applied to those in which earth and sand are intermittently supplied by a hydraulic shovel or the like and continuously supplied to the mixer by a conveyor means, and other mixing methods such as a crushing type may be used. it can.

FIGS. 1 and 2 show the overall construction of the soil improvement machine. In the drawing, reference numeral 1 denotes a lower traveling body, and the lower traveling body 1 has a configuration including crawler-type means having a crawler belt 1a. The lower traveling body 1 is provided with a body frame 2 constituting a chassis connected thereto, and the body frame 2 is provided with various mechanisms and devices. A material supply unit 3 is arranged on the main body frame 2 at the left position in FIG. Further, a mixer 4 is mounted on the right side of the figure, and an improved soil discharging section 5 is provided at a position further rightward than the mixer 4. Further, a machine room 6 in which machines such as an engine, a hydraulic pump, and a direction switching valve unit are incorporated is provided at an upper position of the mixer 4.

The raw material supply section 3 is for supplying a raw material for improving the soil composed of the earth and sand and the soil improving material, and also controls the mixing ratio of the supplied soil and soil to the soil improving material. It has become. For this purpose, the material supply unit 3
Is a sediment hopper 7 serving as a sediment supply device into which sediment is charged, a soil improvement material hopper 8 constituting a soil improvement material supply device for supplying a soil improvement material, and these soil and soil improvement material are directed to the mixer 4. And a carry-in conveyer 9 for carrying the same.

As shown in FIG. 3, the mixer 4 comprises a plurality of paddle mixers 11 provided in a long container 10, and the paddle mixers 11 are rotationally driven by a hydraulic motor 12 to improve soil and soil quality. The material is transported backward while stirring and mixing. The upper part on the left side of the container 10 is opened as a material inflow part 10a, and the lower part on the right rear side has an improved soil discharging part 10a.
b. With this configuration, the earth and sand and the soil improving material can be transferred from the loading conveyor 9 to the material inflow section 10.
a, and the paddle mixer 11 is operated to transfer the soil and soil improvement material from the material inflow portion 10a to the improved soil discharge portion 10b while stirring and mixing the soil and soil improvement material. The improved soil in which the material is uniformly mixed is generated, and the improved soil thus generated is discharged from the improved soil discharge section 10b to a predetermined position by a carry-out conveyor constituting the improved soil discharge section 5.

The carry-in conveyor 9 constituting the material supply unit 3
Is designed to transport the material of the improved soil diagonally upward. That is, the carry-in conveyor 9 is conveyed obliquely upward from the near side to the front side in the conveying direction. Since the mixer 4 is installed on the main body frame 2 provided on the upper part of the lower traveling body 1 and the material inflow part 10a is provided on the upper part thereof, the material supply position to the mixer 4 is extremely high. turn into. Therefore, when the carry-in conveyor 9 is arranged horizontally and the earth and sand hopper 7 is installed on the transport surface of the carry-in conveyor 9, it is necessary to put earth and sand from an extremely high position, and the work becomes extremely difficult. Therefore, in order to facilitate the introduction of the earth and sand, the earth and sand hopper 7
In order to lower the position of the transfer surface of the carry-in conveyor 9 at the installation position, the carry-in conveyor 9 is installed diagonally.

On the other hand, a soil improving material, which is another material of the improved soil, is supplied from a soil improving material hopper 8, and the soil improving material hopper 8 has a storage unit 13 for storing a predetermined amount of the soil improving material. , Feeder 1 provided below storage section 13
And 4. Here, the illustrated storage section 13 is a volume variable section 13a having a bellows shape on the upper side, and a volume invariable section 13b formed of a hard container having a relatively shallow bottom on the lower side. By configuring the storage unit 13 in this way,
When performing soil improvement processing, the volume variable portion 13a is extended upward to increase the amount of soil improvement material stored in the storage unit 13 as a whole, and when transporting this soil improvement machine by a trailer or the like, the volume is increased. By pulling down the variable portion 13a, the height of the entire machine is suppressed. The storage section 13 stores the soil improvement material supplied from a flexible container or the like, and the stored soil improvement material can be supplied to the carry-in conveyor 9 almost continuously from the feeder 14 in a constant amount.

As is clear from FIGS. 4 to 6, the earth and sand hopper 7 has an earth and sand storage section 20.
The lower part has a rectangular frame shape, the upper part has a shape that expands to the left and right, and the upper end part is the earth and sand input part 21. Here, the reason why the upper side is expanded is to widen the earth and sand input part 21 so as to easily input the earth and sand by a bucket or the like of the hydraulic shovel. However, the shape of the sediment storage section 20 is not limited to this, and the entire shape may be a box shape or the entire shape may be an inclined surface. The sediment storage section 20 rises obliquely so as to substantially coincide with the inclination of the carry-in conveyor 9. A sediment discharge port 22 is formed on a front wall surface 20a of the sediment storage section 20 which is located on the front side in the transport direction of the carry-in conveyor 9. The earth and sand discharge port 22 constitutes a gate when the earth and sand is carried out from the earth and sand hopper 7. In addition, sediment discharge port 2
The roller 2 may be provided with a roller or the like for evenly leveling the unloaded soil.

As shown in FIG. 7, a lattice sieve 30 formed by arranging rods vertically and horizontally is provided in the earth and sand input part 21 above the earth and sand storage part 20. Therefore, the earth and sand is taken into the sediment storage unit 20 from the gap formed between the rod in the left-right direction and the rod in the front-rear direction in the sieve 30, and solid matter larger than the gap remains on the sieve 30. Become. This sieve 30
Is a vibrating sieve. For this purpose, a plurality of spring receiving portions 31 are provided on both left and right sides of the earth and sand input section 21 in the earth and sand storage section 20 so as to protrude outward at predetermined positions, respectively. Can be Spring receiver 31 and sand inlet 2
A pair of springs 33 are interposed between the support 1 and the support portion 32 provided in the sand inlet 21, respectively, so that the entire earth and sand hopper 7 is mounted on the support portion 23 attached to the main body frame 2. Elastically supported. Further, the sand inlet 21 is inclined so as to substantially coincide with the inclination angle of the carry-in conveyor 9, and accordingly, the sieve 30 is also inclined.

The sieve 30 is configured to vibrate up and down substantially, and for this purpose, a vibrating drive means is mounted on the support portion 23. The vibrating drive unit has a motor 35 (for example, a hydraulic motor or the like), and an output shaft 35 a of the motor 35.
Is connected to a gear 36 (or a pulley). Further, a rotating shaft 37 is rotatably attached to a position below the lower limit position of the sieve 30 at the sand inlet 21 where the sieve 30 is mounted. Both ends of the rotating shaft 37 protrude from both side surfaces of the sand inlet 21, and a gear 38 (or a pulley) is mounted near one end of the rotating shaft 37. Is provided with a transmission chain 39 (or belt) wound therearound.

The vibrating drums 40, 4 are provided at both ends of the rotating shaft 37.
0 is attached. The center of gravity of the vibration drum 40 is located at a predetermined distance from the rotation shaft 37 (or the vibration drum itself is mounted eccentrically on the rotation shaft). As a result of the change in the center of gravity, the entire screen 30 vibrates. Here, the motor 35 may be constituted by an electric motor, but since the paddle mixer 11 in the mixer 4 is driven by the hydraulic motor 12, the motor 35 is also constituted by a hydraulic motor. This is convenient because the sources can be shared. Therefore, it is referred to as a hydraulic motor 35 below.

As described above, the earth and sand input section 2 of the earth and sand hopper 7
By attaching the vibrating sieve 30 to 1, the earth and sand put into the earth and sand hopper 7 reliably separates solid matter,
Only the earth and sand is guided into the earth and sand storage unit 20. Earth and sand hopper 7
The sediment received inside is stored in the sediment storage unit 20,
In addition, the material is continuously carried out by the carry-in conveyor 9 from the earth and sand carry-out port 22 by a predetermined amount. Further, since the soil improving material supplied from the soil improving material hopper 8 is also supplied to the carry-in conveyor 9, the soil and the soil improving material are supplied to the mixing machine 4, and the inside of the container 10 constituting the mixing machine 4 is supplied. Then, the paddle mixer 11 sufficiently agitates and mixes to produce the improved soil, and the improved soil is discharged from the improved soil discharge portion 10b of the container 10. Then, since the solid matter is completely separated from the earth and sand by the sieve 30 and only the earth and sand is guided into the mixer 4, the stirring and mixing by the plurality of paddle mixers 11 are performed smoothly, and the solid matter is caught. Paddle mixer 1
There is no possibility that the malfunction of 1 will occur.

The earth and sand put into the earth and sand hopper 7 includes not only sand with a high sand content and a low degree of adhesion (hereinafter referred to as low-viscosity soil), but also an extremely fine particle size and an adhesive property. There are also high clay, dehydrated cake, and the like (hereinafter, referred to as high-viscosity soil). Particularly, when the soil is a high-viscosity soil and has a high water content, the viscosity is further increased. When highly viscous soil is put into the sand hopper 7, the following situation may occur. In particular, when the soil is highly viscous and has a high water content, the occurrence of this situation becomes more remarkable.

As shown in FIG. 8, the earth and sand in the earth and sand hopper 7 is conveyed in the direction indicated by the arrow in FIG. However, the sediment discharge port 2 is provided on the front wall surface 20a of the sediment storage unit 20 in the sediment hopper 7.
2 is open, but the sediment discharge port 22 is
a is the restricted range of a. On the other hand, by the action of the carry-in conveyor 9, a conveying force acts on the whole earth and sand stored inside the earth and sand storage unit 20. Accordingly, in the earth and sand hopper 7, the earth and sand facing the earth and sand outlet 22 pass through the earth and sand outlet 22, but the other earth and sand is pressed against the front wall surface 20 a. Since the transportation of the earth and sand by the carry-in conveyor 9 is performed continuously, the pressing force of the earth and sand continuously sent acts on the preceding earth and sand.

Here, when the viscosity of the earth and sand is low such as sand and the like, as shown by a dotted arrow in the figure, when the earth and sand rises along the front wall surface 20a and reaches a certain height, Since it is reversed in a direction away from the front wall surface 20a,
A kind of swirling flow is formed at an upper position of the earth and sand discharge port 22. However, in the case of highly viscous earth and sand, a flow which rises along the front wall surface 20a is difficult to be formed, but rather is pressed straight, and due to its adhesion, the front wall surface 20a
Will be fixed. In particular, the position immediately above the earth and sand discharge port 22 is more greatly affected by the conveying force of the carry-in conveyor 9, so that the earth and sand is closely adhered to the front wall surface 20a with a strong force. Then, it stays in a compacted state that is densely compressed by the pressing force due to the subsequent transport of the earth and sand. Further, since the subsequent sediment is pressed against the condensed soil, the sediment staying in the condensed state gradually grows. As a result, as shown by oblique lines in FIG. 9, the accumulated sediment in the compacted state is in a bridge state around the sediment discharge port 22. As long as the operation of the carry-in conveyor 9 is continued, the convey force acts on the earth and sand, and the earth and sand is carried out of the earth and sand hopper 7 from the earth and sand discharge port 22. As if it were to be bridged like a tunnel, the unloaded sediment would pass through this bridge of sediment, and if it continued for a long time, the length of the tunnel formed by the bridge would be longer ,
The cross-sectional area of the passage becomes small. Therefore, since the earth and sand supplied on the bridge portion will stay at that position, the storage capacity of the earth and sand in the earth and sand hopper 7 is restricted, and in extreme cases, the earth and sand is also discharged from the earth and sand discharge port 22. It will cause trouble.

As described above, in the sediment storage section 20 of the sediment hopper 7, the bridge preventing means 50 for preventing the earth and sand from being cross-linked to the front wall surface 20a of the sediment storage section 20 is provided. The bridging prevention means 50 has a rotating shaft 51 disposed in the direction of conveyance by the loading conveyor 9 in the sediment storage unit 20, and one end of the rotating shaft 51 is attached to the rear end wall 20 b of the sediment storage unit 20. Transmission means 52a composed of a hydraulic motor 52 and a chain, a sprocket, and the like.
Are provided in a linked manner. The other end is the front end wall 2
It is rotatably supported by a bearing 53 attached to the shaft 0a. Then, a predetermined number of stirring blades 54 having a cross-sectional shape such as a circle or a square are attached to the outer peripheral surface of the rotating shaft 51 at a predetermined pitch interval in the axial direction and at predetermined angles in the circumferential direction. Make up.

Here, the stirring blade 54 stirs the inside of the earth and sand hoist 7 to eliminate the portion where the earth and sand stays, to prevent the occurrence of a stay where the earth and sand does not flow, and to make the wall surface of the earth and sand storage portion 20. This is to prevent sediment from accumulating on the ground. For this purpose, the stirring blades 54 are mounted not to extend in a direction perpendicular to the rotation shaft 51 but to extend obliquely forward at a predetermined angle with respect to the axis of the rotation shaft 51. As a result, a substantially uniform stirring force is applied to the entire inside of the sediment storage unit 20, and the inside of the sediment is constantly fluidized.

Moreover, of the sediment storage portion 20 constituting the sediment hopper 7, the front wall 20a in which the sediment discharge port 22 is formed is located at the end in the direction in which the sediment is conveyed by the unloading conveyor 9. Therefore, the earth and sand are on this front wall 2
Oa is prevented from being crosslinked. For this reason, one or more stirring blades at the position closest to the front wall surface 20a among the stirring blades have a function of transferring earth and sand in a direction opposite to the other stirring blades 54 as indicated by reference numeral 55. I try to demonstrate. The stirring blade 55 is formed of a plate having a predetermined width, and its extending direction is a direction orthogonal to the axis of the rotating shaft 51. The plate surface of the stirring blade 55 is On the other hand, it is attached obliquely at a predetermined angle in the direction opposite to the direction of inclination of the stirring blade 54. Thereby, the interval between the front wall surface 20a and the stirring blade 55 can be minimized, and when the rotating shaft 51 is rotated, the earth and sand that is to adhere to the front wall surface 20a is effectively scraped off, and the stirring blade 54 Then, a force for moving the earth and sand in the direction of pushing back the earth and sand in the opposite direction to the stirring blade 55 is exerted.

As described above, in the vicinity of the front wall surface 20a, when the stirring blade 55 rotates, the earth and sand are moved in the direction opposite to the other stirring blades 54. However,
The function of the stirring blade 55 is to prevent the generation of the accumulated sediment in the compacted state as shown in FIG. 9 and to disintegrate it. All the stirring blades provided on the rotating shaft 51 may be in the same direction.

Further, the hydraulic motor 52 for driving the rotating shaft 51 is designed to rotate in forward and reverse directions. Moreover, the output shaft of the hydraulic motor 52 may be
A torque detector (not shown) for detecting the driving torque is mounted, and the rotational load of the rotating shaft 51 is detected by the torque detector. Therefore, the rotation direction and rotation speed of the rotation shaft 51 can be changed according to the torque of the rotation shaft 51 detected by the torque detector.

With the above construction, even if a large amount of highly viscous soil is poured into the earth and sand hopper 7 by a bucket of a hydraulic shovel or the like, the entire inside of the earth and sand storage unit 20 in the earth and sand hopper 7, especially the earth and sand, is removed. The earth and sand are condensed on the front wall surface 20a at the front in the transport direction and do not stay. In other words, the stirring blades 54 and 55 are rotated by rotating the rotating shaft 51 constituting the bridging prevention means 50 provided in the sediment storage unit 20 in the direction indicated by the arrow in FIG. The earth and sand in the entire earth and sand hopper 7 is constantly stirred, and the earth and sand does not partially stay. In addition, since the stirring blades 54 are inclined at a predetermined angle with respect to the axis of the rotation shaft, the stirring blades 54 are conveyed in a swirling state in the conveying direction of the carry-in conveyor 9 or in the opposite direction simultaneously with the stirring of the earth and sand.

Of the stirring blades, two stirring blades 55 located on the upstream side in the conveying direction of the earth and sand by the carry-in conveyor 9 extend in a direction orthogonal to the axis of the rotating shaft 51. The function of these agitating blades 55 is to break down the earth and sand that is going to be in close contact with the front wall surface 20a of the earth and sand storage unit 20, thereby preventing the earth and sand from staying in the bridge. In addition, the rotation of the stirring blades 54 acts so that the earth and sand sent in the same direction as the direction in which the earth and sand is conveyed by the carry-in conveyor 9 is pushed back by the stirring blades 55, so that the earth and sand is applied to the front wall surface 20 a of the earth and sand storage unit 20. It can be prevented from being pressed in the direction.

As described above, in the earth and sand hopper 7,
Since the earth and sand is constantly stirred by the operation of the cross-linking prevention means 50 and is cut off from the inner wall surface thereof, even if a large amount of earth and sand is stored, the earth and sand may partially stay, or may become compacted and agglomerate. This prevents the front wall surface 20a from bridging around the earth and sand discharge port 22. As described above, since the bridge and the stagnation of the earth and sand can be eliminated in the earth and sand hopper 7, the inner volume of the earth and sand hopper 7 can be used almost completely as a storage space, and the buffer between the intermittent introduction of earth and sand and the continuous unloading can be achieved. The function will be demonstrated without regret.
Therefore, if the inner volume of the earth and sand hopper 7 is increased and a large amount of earth and sand is temporarily stored in the earth and sand hopper 7 by a bucket of a hydraulic shovel or the like, the earth and sand is continuously carried out from the earth and sand discharge port 22. In addition, it is not necessary to supply the earth and sand until the inside of the earth and sand storage unit 20 is consumed so as to be almost in the sky. Moreover, since the sand inlet 21 has a wide opening, and the sieve 30 for promoting the separation of the earth and the solid foreign matter is mounted on the earth and sand inlet 21, a large amount of earth and sand can be removed in a very short time. Can be supplied. Therefore, the supply or replenishment of the earth and sand can be intensively performed in a short time, and during the interval of the operation of replenishment of the earth and sand, it is possible to afford to perform other operations such as an operation check of the soil improvement machine, for example. This is extremely advantageous in terms of work efficiency and the like.

Here, the bridge preventing means 50 is operated when high-viscosity soil is put into the earth and sand hopper 7, and it is not always necessary to operate the bridge preventing means 50 for low-viscosity soil. . Further, the rotation speed of the rotation shaft 51 can be changed according to the degree of viscosity. That is,
When the degree of viscosity is extremely high, the rotating shaft 51 is rotated at a high speed to agitate the inside of the earth and sand hopper 7 more vigorously.
It is desirable to rotate at a low speed and stir gently.

Here, various shapes of stirring blades are used. For example, as shown in FIG. 10, a plate-like stirring blade 60 having a predetermined width can be formed. Furthermore, as shown in FIGS. 11 and 12, the stirring blade 61 may be bent in the middle. Then, the angle of the stirring blade with respect to the rotation axis can be set as desired, but as shown in FIG.
When the rotation trajectories 2 and 62 partially overlap each other as shown by hatching in the figure, the entire earth and sand in the earth and sand storage unit 20 can be reliably stirred. In addition, it is desirable that the stirring blade having the above-described various shapes is replaceably attached to the rotating shaft. To do this,
For example, as shown in FIG. 14, a connecting member 70 formed of an L-shaped plate is fixedly provided on the rotating shaft 51, and the roots of the various stirring blades described above are fixed to the connecting member 70 with bolts. The bolt insertion holes 71, 71 are formed. When the line connecting the bolt insertion holes 71 is inclined at a predetermined angle with respect to the plate surface of the connecting member 70,
The stirring blade is attached in a state of being inclined at a predetermined angle with respect to the rotation shaft 51.

Further, as shown in FIGS. 15 and 16, two sets of bridging prevention means can be provided in the sediment storage section 20. Each of the two rotating shafts 151 constituting the two sets of bridging prevention means 150 is driven by a single hydraulic motor 152.
2, and the other rotary shaft 151 is configured to be rotationally driven in the opposite direction via transmission means 157 such as a gear. Furthermore, these two rotating shafts 151, 1
The stirring blades 154 and 155 attached to the 51 are mounted so as to overlap with the other stirring blades 154 and 155 when viewed from the axial direction. Accordingly, the earth and sand in the earth and sand hopper 7 can be more efficiently stirred, and the earth and sand adhering to one of the stirring blades can be scraped off by the other stirring blade.

In the earth and sand hopper 7, the earth and sand storage portion 20 has a rectangular shape on the lower side where the earth and sand discharge port 22 is provided, and the upper side wall surfaces 20c and 20c are inclined surfaces which are diagonally outwardly expanded. It has a shape. Here, depending on the inclination angle of the side wall surface 20c, the highly viscous soil may adhere to and accumulate on the wall surface. In order to prevent this, as shown in FIG. 17, an elastic sheet 80 such as a rubber sheet may be laid at least on the inner surface of the side wall surface 20c. Moreover, in order to interpose an air layer between the elastic sheet 80 and the inner surface of the earth and sand receiving frame 12, the ribs 81 are fixedly provided in a plurality of steps with respect to the inclination of the side wall surface 20c. As a result, the earth and sand flows down along the inclined surface of the elastic sheet 80 due to vibrations or the like by the sieve 30, and does not adhere and stay on the side wall surface 20c.

[0039]

As described above, the present invention is constructed as described above, so that the earth and sand supplied into the earth and sand hopper can be reliably discharged from the earth and sand discharge port regardless of the state and properties of the earth and sand, and the cross-linking and stagnating inside can be achieved. It has the effect of not allowing it to be performed.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a soil improvement machine shown as an example of a machine to which the earth and sand supply device of the present invention is mounted.

FIG. 2 is a plan view of FIG.

FIG. 3 is an exploded view of each mechanism in the soil improvement machine of FIG. 1;

FIG. 4 is a plan view of the earth and sand hopper showing the first embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is a plan view showing a sieve installed at the earth and sand input section of the earth and sand hopper of FIG. 4;

FIG. 8 is an explanatory diagram of a cause of occurrence of bridging stagnation of earth and sand in the earth and sand storage unit.

FIG. 9 is an explanatory diagram showing that earth and sand are in a crosslinked state.

FIG. 10 is a plan view showing another shape of the stirring blade attached to the bridging prevention means provided in the earth and sand storage part of the present invention.

FIG. 11 is a plan view showing still another shape of the stirring blade attached to the bridging prevention means provided in the earth and sand storage part of the present invention.

FIG. 12 is a front view of FIG. 11;

FIG. 13 is a plan view showing still another shape of the stirring blade attached to the bridging prevention means provided in the sediment storage section of the present invention.

FIG. 14 is an explanatory view of a configuration of a connecting portion in which a stirring blade is detachably mounted on a rotating shaft of a bridge preventing means provided in a soil storage section of the present invention.

FIG. 15 is a plan view of a sediment storage unit provided with a bridge prevention unit according to a second embodiment of the present invention.

16 is a sectional view taken along the line CC of FIG.

FIG. 17 is a cross-sectional view of a main part in a state where an elastic sheet is attached to the sediment storage section of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Main body frame 3 Material supply part 4 Mixer 5 Improved soil discharge part 7,50 Sediment hopper 8 Soil quality improvement material hopper 9 Carry-in conveyor 20 Sediment storage part 20a Front end face 21 Sediment input part 22 Sediment discharge port 30 sieve 50 , 150 Cross-linking prevention means 51, 151 Rotation shaft 52, 152 Hydraulic motor 54, 55, 60, 61, 62, 154, 155 Stirring blade 70 Connecting member 71 Bolt insertion hole 80 Elastic sheet 81 Rib

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E02D 3/12 102 E02D 3/12 102 // B65B 39/00 B65B 39/00 Z (72) Inventor Yamamoto Yasuharu 2-6-1 Otemachi, Chiyoda-ku, Tokyo Sun Construction Machinery Co., Ltd. (72) Inventor Eiji Yamazaki 650, Kandamachi, Tsuchiura-shi, Ibaraki Pref. Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant (72) Inventor Miura Tetsushiro F-term (reference) 2-6-2 Otemachi 2-chome, Chiyoda-ku, Tokyo 2D040 AB07 CD07 EB04 3E055 AA10 BB01 BB08 3F075 AA08 BA01 BB01 CA02 CA09 CC01 CC08 DA04 4G037 DA21 EA03 4G078 AB20 BA01 BA07 CA22 DA01 EA10

Claims (15)

[Claims] 1. An earth and sand having an opening at an upper end, which is a frame-shaped member for storing a predetermined amount of earth and sand, and an earth and sand discharge port formed on a wall surface on the downstream side in the direction of earth and sand transport by the conveyor means. A sediment hopper provided with a storage unit is installed on the conveyor path of the conveyor means, and in the earth and sand supply device for continuously carrying out the earth and sand introduced into the earth and sand hopper from the earth and sand discharge port by the conveyor means, Is a construction provided with a bridge preventing means for preventing earth and sand staying inside the bridge from being bridged at the earth and sand discharge port. 2. The earth and sand supply device according to claim 1, wherein a sieve for separating earth and sand from solid foreign matter is installed at an inlet of the earth and sand storage part. 3. The earth and sand supply device according to claim 2, wherein said sieve is constituted by a vibrating sieve. 4. A drive shaft arranged to cover the entire length of the earth and sand transporting direction in the earth and sand storage unit, a rotation drive unit for rotating and driving the drive shaft, and a cross-linking prevention means provided on an outer peripheral surface of the drive shaft. 2. The earth and sand supply device according to claim 1, comprising a plurality of agitating blades provided at every angle, and one or a plurality of sets of said bridging prevention means provided in said earth and sand storage part. 5. A structure in which the stirring blade is continuously inclined in an axial direction from a root thereof to a tip end thereof in order to form a swirling flow of the sediment inside the sediment storage part. The earth and sand supply device according to claim 4, characterized in that: 6. The earth and sand supply device according to claim 5, wherein the stirring blade is provided with a bent portion having a predetermined angle in a part of the tip end side in the axial direction. 7. At least one stirring blade provided in the vicinity of a wall surface of the sediment storage section where the earth and sand discharge port is formed, is inclined in a direction opposite to other stirring blades, or The earth and sand supply device according to claim 5, wherein the arrangement is arranged in a direction orthogonal to the axis. 8. The earth and sand supply device according to claim 4, wherein said stirring blade has a cross-section of any one of a round bar shape, a square bar shape and a plate shape. 9. The earth and sand supply device according to claim 4, wherein the stirring blade is detachably attached to the drive shaft. 10. The earth and sand supply device according to claim 4, wherein the rotation drive means of the drive shaft is configured to be capable of rotating forward and backward. 11. The earth and sand supply device according to claim 10, wherein said rotary drive means is constituted by a variable speed motor and is provided with a drive torque detecting means. 12. The earth and sand supply device according to claim 10, wherein said rotary drive means is constituted by a hydraulic motor. 13. The earth and sand supply device according to claim 1, wherein the earth and sand storage part is configured to have a rectangular shape on a lower side and an inclined surface shape with an upper side expanding obliquely outward. 14. An elastic sheet is provided along an inner surface of at least a portion of the earth and sand storage part having an inclined surface shape, and in order to float the elastic sheet from the inner surface of the earth and sand storage part,
14. The earth and sand supply device according to claim 13, wherein ribs are provided between the inner surface of the earth and sand storage part and the elastic sheet at predetermined pitch intervals in a vertical direction. 15. The conveyor means is provided with a soil improving material hopper upstream of the earth and sand transport direction, and a downstream end of the conveyor means in the transport direction is a mixing device for mixing earth and sand with the soil improving material. 2. The earth and sand supply device according to claim 1, wherein the soil and sand supply device is configured to be connected to the means.