JP2000126572A - Fluidization device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To crush securely earth lamps and form them into slurry even in the case the earth lumps are firmly bonded with earth and sand fed into a fluidizing tank. SOLUTION: The agitating force is applied on the lower section side from the position of a main agitating plate 30 of a fluidizing tank, and an earth lump crushing means 45 for crushing selectively the earth lumps out of residues on a bottom face 20a is provided in a fluidization device. The earth lump crushing means 45 is provided with rolling rollers 47 on the lower end of a lifting and lowering rod 46 suspended from the lower face of the main agitating means 30, and the lifting and lowering rod 46 is inserted through a rod insertion hole 48 provided on the main agitating plate 30, and the rolling rollers 47 are energized in the direction of being brought into contact with the bottom face 20a of the fluidizing tank by a spring 49, and when earth lumps remain on the bottom face 20a, the earth lumps are pressed and crushed. Respective rolling rollers 47 are so disposed as to face their front side inwardly to a tangent αjust by the given angle θ at the time of rotating the main agitating plate 30 by a rotating shaft 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluidizing apparatus used for fluidizing and refilling soil generated by excavation at a civil engineering site or a construction site.

[0002]

2. Description of the Related Art When laying city gas pipes or sewage pipes under a road, a pavement layer such as asphalt is first peeled off, and a pipe burial space is secured by excavating to a predetermined depth. Pipes will be installed in this space. Then, after the earth and sand are backfilled, compaction is performed, and pavement is performed thereon again. As the backfill soil, it is common to use one generated by excavation.

[0003] However, depending on the geological layer or the like on which the pipes are laid, if the soil generated by excavation is used for backfilling, there is a poor one that causes land subsidence or the like.
For this reason, in recent years, a so-called fluidized backfill method has been put to practical use in which the soil quality of soil generated by excavation is improved to change the soil into soil suitable for backfill. This fluidized backfill method is to mix the generated soil with water and a solidifying agent at an appropriate mixing ratio and stir to change into a backfill material in a slurry state in which they are uniformly mixed. The fluidized soil, that is, the fluidized soil is backfilled at the excavation site. The fluidized treated soil as a backfill material is in a fluid state, and the wraparound of the buried object is smooth, so it is possible to prevent the occurrence of defective backfill due to the congestion of the buried object and eliminate the need for compaction. In addition, there are advantages such as speeding up work and suppressing generation of noise and vibration. Here, as the solidifying agent, cement, cement-based solidifying agent, lime, lime-based solidifying agent, cement-lime composite-based solidifying agent is mainly used, and other additives are added to adjust the fluidity and the solidifying time. An agent and a mixture are appropriately added. As the water, tap water or industrial water can naturally be used, but river water, rainwater or the like may be used.

For example, in a relatively small construction site such as a construction where gas pipes are buried along a road,
Even if the processing capacity is limited, small-scale fluidization equipment has been developed that is mounted on vehicles such as trucks and trailers, brought into the vicinity of the work site, and fluidizes the generated soil. I have. In particular, in the case of small-scale construction in a place such as a city where traffic is heavy, mobility is required and a small amount of soil needs to be efficiently treated. Therefore, the fluidization treatment device itself is made to be a self-propelled type, the earth and sand are supplied directly from the excavation point, and the backfill is not filled, and the fluidization treatment device is moved as appropriate as the construction progresses Then, speeding up and efficiency of processing are achieved. Therefore, the fluidization processing device is mounted on a vehicle, but if a crawler-type traveling body equipped with a crawler belt is used as a traveling means of the vehicle, traveling can be performed even on a work site having unevenness due to digging, etc. It becomes the most suitable for performing a fluidization processing method.

[0005] In the fluidization treatment, it is necessary to completely and uniformly mix the generated soil, water and the solidifying agent. For this purpose, a fluidization treatment tank provided with stirring means is installed in a traveling vehicle. In addition, a self-propelled fluidization treatment apparatus configured to supply water, generated soil and solidified material into the fluidization treatment tank and to perform fluidization treatment by operating a stirring means has been put to practical use. In this type of self-propelled fluidization processing, a digging means provided with a bucket is provided in itself for excavation of earth and sand and introduction into a fluidization processing tank, or the digging operation and flow of earth and sand are performed. In some cases, the charging operation into the chemical treatment tank is performed using, for example, excavating means of a hydraulic shovel. In any case, since excavated soil is directly charged into the fluidization tank, it is necessary to remove rocks, concrete pieces, and other solids that do not contribute to fluidization from the excavated soil in advance. For this purpose, the fluidization tank is generally provided with sieving means for separating earth and sand from solid matter. In order to backfill the fluidized soil from the fluidized tank to the excavation site, the fluidized tank is provided with a pipe connection for discharging the fluidized soil. The pipe connection is provided with an open / close valve. A hose or the like is connected to the pipe connection, and the open / close valve is opened, so that the fluidized soil in the fluidization tank is backfilled at the fluidized tank. Is supplied.

[0006]

With the above construction, even if the soil generated by excavation is of poor quality, it can be converted into a useful backfill material. This is extremely advantageous in that small-scale construction such as laying of city gas pipes and sewage pipes can be performed quickly and efficiently, since there is no need to carry in the equipment from the airport.

By the way, since excavated soil is directly charged into the fluidization tank, the excavated soil includes a state in which the soil is bound to form a solidified mass, that is, a mass of earth. Unlike the solid material such as rocks, this clod is originally solidified from the fluidized fluid.
It is introduced into a fluidization tank to be subjected to fluidization. A stirring blade is provided in the fluidization tank, and the inside of the tank is stirred by the stirring blade, so that most of the soil mass is collapsed by stirring to be in a slurry state.
However, there are some soils that are strongly bound and do not easily collapse even by stirring, and the soil mass that does not collapse by stirring will remain at the bottom of the fluidization tank.

[0008] On the other hand, the stirring blades are capable of stirring almost the entire inside of the fluidization tank, but solid matter having a high specific gravity such as rock may be mixed in the fluidization tank. The solids stay at the bottom of the fluidization tank. If the stirring blade extends the stirring force to the tank bottom, there is a possibility that the stirring blade may bite between the tank bottom and the stirring blade, and when such a situation occurs, the smooth rotation of the stirring blade is impaired, In severe cases, the stirring blades may lock up. For this purpose, it is common to arrange the stirring blade at a position higher than the tank bottom by a predetermined dimension. Then, as a result, it becomes impossible to apply a strong stirring force to the vicinity of the tank bottom, so that the soil mass that has settled on the tank bottom cannot be collapsed, and the processing ends in a soil mass state. Then, the fluidized soil obtained as a result of the treatment is discharged for backfilling, but the soil mass remains in the fluidized treatment tank without being discharged. Therefore,
If the fluidization treatment is performed a plurality of times while such a mass of soil remains, remnants in the fluidization treatment tank will significantly increase, the efficiency of the treatment will decrease, and the sediment and water and the solidified material will be reduced. Will also be affected. In addition, there are cases where the earth mass is discharged as it is, but there is a problem that the quality of the generated slurry is deteriorated because the solidified material is not mixed in that portion.

The present invention has been made in view of the above points, and an object of the present invention is to make it possible to easily remove solidified clumps of solidified soil when producing fluidized soil in a fluidization tank. To be able to be crushed.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a fluidizing tank in which earth and sand, water and a solidifying agent are charged. The contents are agitated and mixed by rotating the rotating shaft by rotating drive means, and the contents are discharged from the lower side surface of the fluidization tank. Is characterized in that a construction is provided with a clod crushing means for crushing the clod stagnating at the bottom of the fluidization tank.

Here, the crushing means may be fixedly connected to the stirring blade. However, the crushing means which can be slidably contacted with the bottom surface of the fluidization tank at the lower portion of a lifting rod vertically movably movable up and down by a predetermined stroke. It is desirable to adopt a configuration in which a pressure portion is provided. In addition, it is desirable that the mass pressing part not only slides along the bottom surface of the fluidization tank but also has a rolling surface that can be rolled by being formed in a circular or polygonal shape. In order to crush the mass more effectively, a pressing force is applied to the mass, but for this purpose, the weight of the mass crushing means or the biasing means such as a spring is applied to the mass of the mass of the mass by pressing the solid mass on the bottom surface of the fluidization tank. It is configured to contact with the pressing force of. Solid matter such as gravel also stays at the bottom of the fluidization tank, and such solid matter cannot be crushed in the mass pressurizing section. And, in order not to hinder the operation of the stirring blade by the mass pressurizing unit, as the mass pressurization unit, a lifting stroke that at least climbs over solid matter such as gravel staying at the bottom of the fluidization tank. It is desirable to have

[0012]

An embodiment of the present invention will be described below with reference to the drawings. First, FIG. 1 shows a schematic configuration of a fluidization processing apparatus. In the figure, 1 is a fluidization tank and 2 is a stirring and mixing means. First, FIG.
As shown in FIG. 1, water W is supplied to the fluidization tank 1 in advance, and in this state, the generated soil G is put into the fluidization tank 1 as shown in FIG. This generated soil G
It is preferable to remove lump such as rocks and foreign matter such as metal before charging. However, since it is difficult to completely remove lumps and foreign substances, it is permissible that they are mixed into the fluidization tank 1 to some extent. In addition, the operation of adding the generated soil G is started, and at the same time, the operation of the stirring and mixing means 2 is started to stir and mix the water W and the generated soil G.
In this way, by simultaneously performing the charging of the generated soil G and the stirring by the stirring and mixing means 2, the water W and the generated soil G can be mixed smoothly.

While the generated soil G is being added to the water W, the contents of the fluidization tank 1 are stirred by the stirring and mixing means 2 so that the generated soil G and the water W are uniformly mixed to form a slurry. After the generated soil G is thus adjusted in water content, while the stirring by the stirring and mixing means 2 is continued, as shown in FIG. The solidified material H is uniformly mixed with the slurry S, and the contents are agitated by the agitating and mixing means 2 to make the whole completely uniform, thereby obtaining fluidized soil. This fluidized soil is a fluid consisting of an unsolidified slurry that maintains a certain fluidized state, depending on the mixing ratio of the generated soil G, water W, and solidified material H. By performing the fluidization process in this way, for example, soil that is not suitable for backfill, such as the Kanto loam layer, can be converted into an effective backfill material,
The excavated portion can be backfilled with excavated soil. Moreover, although the solidified material H is mixed in the backfill material, the fluidity is maintained immediately after backfilling, so that the wrapping around the buried object is improved, and
Since it solidifies in about 24 hours, no compaction is required. Furthermore, since the strength after solidification can be adjusted by the mixing ratio of the solidifying agent, it is possible to excavate the buried place again. Here, generated soil G and water W
Since the mixing ratio of the solidified material H changes depending on the properties of the generated soil G, the water content, and the like, it is preferable to obtain the mixing ratio in advance by experiment or the like before performing the actual fluidization treatment.

The generated soil is subjected to fluidization processing as described above. This fluidization processing apparatus is installed in a traveling vehicle as shown in FIGS. It can be configured as an apparatus 10 to take in soil generated by excavation at a work site, fluidize it, and then backfill it directly to the excavation point. Here, as the vehicle, a crawler-type traveling vehicle equipped with crawler tracks is exemplified, but the traveling means does not necessarily have to be a crawler-type traveling vehicle. good.

As apparent from these figures, the traveling means is a crawler traveling body 1 having a pair of right and left crawler tracks.
The vehicle body frame 12 is connected to the crawler type traveling body 11. The crawler type traveling body 11 is provided with a driving sprocket 14 and an idler 15 at both ends of a traveling body frame 13 composed of a pair of right and left, and a crawler track 16 forming an infinite rail is provided between the driving sprocket 14 and the idler 15. It is provided by winding. Therefore, by driving the left and right driving sprockets 14, the entire vehicle runs on its own.

The body frame 12 is a crawler type traveling body 11
The vehicle body frame 12 can be turned by the turning device 18. On the vehicle body frame 12, a power unit 19 is provided at a position on the front side with respect to the turning center R, and a fluidization processing tank 20 is provided on the rear side so as to balance the weight. A driver's seat 21 for an operator to sit down and operate the machine is provided at an upper position of the power unit 19, and an operation lever and the like are mounted near the driver's seat 21. Each part can be operated by operating the operation lever.

The fluidization tank 20 has a bottom surface 20a,
The fluidization tank 20 is provided with an overhang 22 toward the rear of the vehicle. A blade-shaped sieving unit 25 is detachably attached so as to cover a predetermined range from the overhang portion 22 to the upper portion of the processing tank 20, and a portion of the sieving unit 25 is a portion for inputting earth and sand. The sieving unit 25 is provided with a sieve 25b formed by bridging a crosspiece over a frame-shaped main body 25a, attaching a grid, or the like,
When the excavated soil is contaminated with a lump such as rocks, metal or other lump-like foreign matter, a large one of them is removed so as not to enter the fluidization tank 20. Therefore, if necessary, the main body 25a of the sieving unit 25 can be moved in the horizontal direction, and the sieving unit 25 can be reciprocated in the horizontal direction using reciprocating means such as a hydraulic cylinder or a hydraulic motor. It can also be configured to promote the fall of earth and sand. However, it is impossible to prevent a relatively small lump or the like from flowing into the fluidization tank 20.

As shown in FIG. 4, the fluidizing tank 20 is provided with a stirring and mixing means 26. The stirring and mixing means 26 includes a rotating shaft 27, a plurality of stirring blades 28 extending at a lower end of the rotating shaft 27 in a direction perpendicular to the axis thereof, and a speed reducer for rotating the rotating shaft 27. And an agitating mechanism including the hydraulic motor 29.
Here, as is clear from FIG. 5, the stirring blade 28 has a long main stirring plate 30 having a predetermined width connected to the rotation shaft 27, and the main stirring plate 30 is provided at the lower end of the rotation shaft 27. It is attached to the provided attachment portion 27a. Here, the main stirring plate 30 may be configured as a flat plate, but in order to apply a stirring force to a wider range, the horizontal portion 30a and the inclined plate portion 30b are required.
May be connected in series. That is, FIG.
As shown in the figure, the main stirring plate 30 projecting to the left at the position on the front side in the rotation direction in the horizontal portion 30a is
0b is a main stirrer plate 30 projecting obliquely downward and to the right.
Forms an inclined plate 30b so as to face diagonally upward.
Further, a plurality of auxiliary stirring plates 31 project upward from the horizontal portion 30a of the main stirring plate 30 at predetermined intervals, and each of the auxiliary stirring plates 31 is attached in the rotation direction. On the other hand, it is oblique to the left-right direction. The hydraulic motor 29 is mounted on the mounting plate 32. The mounting plate 32 is composed of a pair of upper and lower plate members connected so as to bridge between a pair of support members 33, 33 formed in a gate shape, and the support members 33, 33 are erected on the vehicle body frame 12. Have been.

At the upper part of the fluidization tank 20, a portion where the above-mentioned sieving unit 25 is mounted and a mounting plate 3
Except for the portion covered by 2, a lid 34 is attached, and a water supply pipe 35 is provided in the lid 34 so as to penetrate therethrough. The water supply pipe 35 is formed of a pipe curved in an L-shape, and an end directed downward passes through the lid 34 and faces the inside of the fluidization tank 20. The horizontal portion is connected to the support member 33 and has an on-off valve 36.

The lid 34 is provided with an opening / closing door 34a. By opening the opening / closing door 34a, a solidifying agent can be introduced. The solidifying agent is accommodated in a solidifying agent container 37 having an open top, and by inverting the solidifying agent container 37 with the open / close door 34a open,
The solidifying agent can be charged into the fluidization tank 20. Here, since the solidifying agent container 37 containing the solidifying agent has a considerable weight, the structure is such that the charging operation is automated.

For this purpose, the solidifying agent container 37 is held by an L-shaped reversing member 38 by a holder 38a, and the reversing member 38 is reversible to a horizontal portion of a support rod 39 erected on the vehicle body frame 12. It is connected to. Also,
A hydraulic cylinder 40 is pivotally mounted between the lower surface of the reversing member 38 and the body frame 12.
When the inversion member 38 is inverted around the support rod 39 according to 0, the solidifying agent container 37 is inverted, and the solidifying agent is supplied into the fluidization processing tank 20.

Further, the peripheral body 2 of the fluidization tank 20
On the lower side in FIG.
Is attached. The discharge pipe 41 is provided with the on-off valve 4
2 and a hose 43 is connected to the end. Further, an inspection port 44 is provided at a lower position of the peripheral body portion 20b of the fluidization processing tank 20, and the inspection port 44 is configured by a door that can be opened and closed. Therefore, after the fluidization treatment is performed, solids remaining in the fluidization treatment tank 20 can be removed and the inside can be cleaned.

As described above, the fluidization treatment is performed by using the fluidization treatment device 10. In this fluidization treatment, the treated soil as the contents of the fluidization treatment tank 20, the water and the solidifying agent are uniformly dispersed. Need to mix. The contents are stirred and mixed by the stirring and mixing means 26. When the contents are uniformly mixed by the stirring and mixing means 26, a slurry state is obtained. The slurry is a highly viscous fluid because the content ratio between the soil and the solidifying agent is considerably high, and this fluid is fluidized soil as a product. The fluidized soil described above is directly buried in the excavation site via the discharge pipe 41. The discharge pipe 41 for this purpose extends toward the rear side of the vehicle body frame 12.

The fluidized soil is produced and backfilled as described above. The contents of the fluidized tank 20 are rapidly and efficiently and uniformly stirred and mixed, and the fluidized soil is produced. The fluidized soil must be quickly and completely discharged from the fluidized treatment tank 20. For this purpose, a stirring and mixing means 26 is provided in the fluidization treatment tank 20, and the inside of the tank is sufficiently stirred by stirring blades 28 constituting the stirring and mixing means 20.

In the fluidization tank 20, excavated soil is directly charged.
The excavated soil has various states depending on the construction site.
For example, various foreign substances other than earth and sand may be mixed in large amounts. Here, the foreign substances include rock, concrete pieces, glass, metal, and other solid foreign substances having a large specific gravity, and solid foreign substances having a small specific gravity such as wood chips. When the slurry is generated in the fluidization tank 20, the former sinks and stays on the bottom surface 20a, and the latter floats on the slurry surface. In addition, rocks include a mixture of gravel with the smallest particle size, gravel, and even larger stones. on the other hand,
There are various forms of earth and sand. For example, there is a clay that is sticky from a sand that is dry and has a high fluidity, and there is also a solid mass obtained by solidifying the soil. In particular, when the water content of the clayey soil is reduced to a certain extent after being compressed, the soil is in a state of a mass, but this mass does not easily collapse.

The fluidization tank 20 is provided with a sieving unit 25. The sieving unit 25 is used to efficiently take in the earth and sand and also to take in lumps, gravel and gravel.
The pitch interval of 5b is widened to some extent, and solids having a relatively large particle size such as pebbles may enter. When they enter the fluidization tank 20, they settle to the bottom due to their own weight, but the sediment is dispersed in the water by agitation, but not only gravel, gravel, etc. At the bottom surface 20a.
The main stirring plate 30 of the stirring blade 28 is arranged at a position higher than the bottom surface 20a of the fluidization treatment tank 20 by a predetermined height, so that the stirring blade 28 is not interfered by solid matter staying on the bottom surface 20a and is smooth. This prevents the occurrence of a situation such as an increase in rotational load or locking.

In the stirring blade 28, an auxiliary stirring plate 31 is provided on the upper side of the main stirring plate 30, so that a sufficient stirring force is applied from the position of the main stirring plate 30 to the upper side of the fluidization tank 20. be able to. However, the portion from the lower side of the main stirring plate 30 to the bottom surface 20a of the stirring and mixing means 26 is not sufficiently stirred. Therefore, the lower portion of the main stirring plate 30 exerts a stirring force also on the lower side of the fluidization tank 20 and, among those remaining on the bottom surface 20a, the crushing means for selectively crushing the lumps. 45 are provided.

FIGS. 6 to 8 show the mass crushing means 45.
Is shown. In the horizontal portion 30a of the main stirring plate 30, a rolling roller 47 is provided at the lower end of a lifting rod 46 vertically suspended from the lower surface of the main stirring plate 30 as a rock pressing portion for pressing and breaking the clay. It is composed of The clod crushing means 45 is arranged so as to avoid the auxiliary stirring plate 31 projecting from the position of the main stirring plate 30 on the upper surface side of the main stirring plate 30 from the position sandwiching the connection portion of the rotating shaft 27, A plurality is provided for the section. Here, each rolling roller 47 is oriented in a direction orthogonal to the main stirring plate 30, that is, in a tangential direction when the main stirring plate 30 is rotated by the rotating shaft 27.

The lifting rod 46 of the clod crushing means 45 is connected to the main stirring plate 30 so as to be non-rotatable and vertically movable. For this reason, as is apparent from FIGS. 7 and 8, the lifting rod 46 is attached to the rectangular rod body 4.
6a, on the side, that is, in the fluidization tank 20
And a supporting portion 46b formed of a circular rod continuously provided so as to protrude in a direction substantially parallel to the bottom surface 20a. The rolling roller 47 having a disc shape is provided with a supporting portion 46b.
It is supported rotatably.

On the other hand, a rod insertion hole 48 through which the rod body 46a of the lifting rod 46 is inserted is formed in the horizontal portion 30a of the main stirring plate 30 so as to penetrate in the plate thickness direction. The upper end of the rod insertion hole 48 is
6, a rotation restricting portion 48 slightly larger than the outer shape of the rod main body 46a and having a similar shape to the rod main body 46a, and a cross section connected to the rotation restricting portion 48a and having a diameter larger than the length of the diagonal line. It comprises a circular spring mounting portion 48b and a holding plate mounting portion 48c formed on the lower surface of the main stirring plate 30 and larger than the spring mounting portion 48b. The holding plate mounting portion 48c may have a circular shape, but is desirably a polygonal shape such as a quadrangle. Thus, when the rolling roller 47 rolls along the bottom surface 20a of the fluidization tank 20, the rolling roller 47 is held so as not to rotate around the axis of the lifting rod 46.

The lifting rod 46 is inserted into a rod insertion hole 48 of the main stirring plate 30, and a disc-shaped spring receiving portion 46 c is provided at an intermediate position of the lifting rod 46.
The spring receiving portion 46c is smaller than the hole diameter of the spring mounting portion 48b of the rod insertion hole 48, and is provided between the spring receiving portion 48c and the lower surface of the rotation restricting portion 48a of the rod insertion hole 48 in the direction of pushing down the lifting rod 46. A biasing spring 49 is mounted. Therefore, the spring receiving portion 46c provided on the elevating rod 46 also functions as a restricting portion that restricts the descending stroke end of the elevating rod 46. For this,
The holding plate 50 having a through hole 50a through which the lifting rod 46 is inserted is screwed to the holding plate mounting portion 48c. In order to allow the large-diameter spring receiving portion 46c provided on the elevating rod 46 to pass through the holding plate 50, the holding plate 50 is divided in half and joined to each other. It is desirable to attach. When the rolling roller 47 provided in connection with the lifting rod 46 contacts the bottom surface 20a of the fluid tank 20, the spring receiving portion 46c of the lifting rod 46 contacts the holding plate 50,
It is located above the holding plate 50.

The fluidization processing device 10 according to the present embodiment
Is constructed as described above. For example, when digging a gutter on a road, arranging a sewer pipe in this gutter, and performing construction work for burying the sewer pipe, FIG. Thus, the hydraulic excavator PS and the dump truck DT are used. The hydraulic excavator PS is for excavating earth and sand, and for this purpose, a front working mechanism FM having a bucket BK is provided. Also, the dump truck DT
Is to temporarily place the excavated earth and sand on the loading platform TR,
A water tank WT is placed on the carrier TR for carrying out excess earth and sand.

First, as shown in FIG. 9A, excavation is performed by a hydraulic excavator PS, and the soil generated by the excavation is placed on the carrier TR of the dump truck DT. Here, temporary placement by the dump truck DT is not necessarily required, but temporary placement is preferably performed in order to remove solid foreign substances such as clumps such as rocks and metals from earth and sand in advance. Then, for example, a fume pipe HC is arranged at the excavation site.

When a required amount of earth and sand is deposited on the dump truck DT, the fluidization processing device 10 is driven to move to a position close to the dump truck DT. In this state,
First, a water supply hose from a water tank WT installed on the loading platform TR of the dump truck DT is connected to the water supply pipe 35, and the on-off valve 36 is opened to supply water to the fluidization processing tank 20. Here, the opening and closing operation of the on-off valve 36 may be performed manually, but if it is configured to be opened and closed by a hydraulic pilot type, the driver's seat 2 can be opened and closed.
1 allows the operator to control automatically. When a predetermined amount of water is supplied into the fluidization tank 20, the water supply is stopped.

Then, as shown in FIG. 9B, the excavator PS is operated to take out the earth and sand from the bed TR of the dump truck DT and to put it into the fluidization tank 20. The earth and sand is supplied by feeding the earth and sand onto the sieving unit 25 by the bucket BK of the hydraulic excavator PS. When this earth and sand input begins,
The operation of the stirring and mixing means 26 is started. That is, the rotary shaft 27 is rotated around the axis by the hydraulic motor 29, thereby rotating the stirring blade 28 provided in connection with the rotary shaft 27. Since the inside of the fluidization tank 20 contains almost only water at the time of starting the introduction of the earth and sand, it is preferable to operate the rotating shaft 27 in a low-speed rotation state in order to prevent scattering.

When the earth and sand are continuously supplied, the viscosity in the fluidization treatment tank 20 increases. Therefore, when the earth and sand are injected to a certain extent, the rotation speed of the rotating shaft 27 is increased to increase the stirring efficiency. As a result, the earth and sand are uniformly mixed with the water, and a mud state or a slurry state is obtained. The solidifying agent is charged from the solidifying agent container 37 into the fluidization treatment tank 20, the solidifying agent is added to the slurry, and the stirring blade 28
By continuing the rotation of, the added solidifying agent is evenly dispersed in the mixture of the slurry and the earth and water, and a fluidized soil composed of a high-viscosity fluid is obtained.

As described above, in addition to the earth and sand, solids such as rocks enter into the fluidization tank 20. The state of the earth and sand is not limited to the state of the flowing state but also the state of the earth mass. In some cases, this mass is solidified by a strong binding force that does not collapse easily. And
The rock and the solidified mass having a high degree of solidification will stay on the bottom surface 20a in the fluidization tank 20. The clod crushing means 45 vertically suspended on the main stirring plate 30 constituting the stirring blade 28 selectively crushes the clump of the material stagnating on the bottom surface 20a as described above. Can easily get over, so that the rotation of the stirring blade 28 is not hindered.

As shown in FIGS. 10 and 11, it is assumed that the rock RC and the earth mass CS stay on the bottom surface 20a of the fluidization tank 20. In this state, when the stirring and mixing means 26 is operated and the stirring blade 28 is rotated, the rolling rollers 47 constituting the clay crushing means 45 vertically provided on the main stirring plate 30 roll along the bottom surface 20a. Then, when the rolling roller 47 reaches the position of the rock RC and the earth mass CS, as shown in FIG.
You will get on top. Since the rolling roller 47 is raised by this riding, the lifting rod 4 connected thereto is moved upward.
6 is displaced upward against the spring 49. Therefore, the urging force of the spring 49 presses the rock RC and the earth mass CS and presses the rock RC and the earth mass CS against the bottom surface 20 a of the fluidization tank 20.

Here, although the earth mass CS is solidified, it is moistened by the water in the fluidization tank 20 and its binding force is weakened. Therefore, as shown in FIG. The pressing force and the weight of the rolling roller 47 and the lifting rod 46 press the soil mass CS having the weakened binding force to be crushed. On the other hand, the rolling roller 47 riding on the rock RC can easily get over by the rotation of the stirring blade 28. Moreover, the lifting rod 46 and the rolling roller 47 connected thereto are connected to the stirring blade 2.
8 and rotates together with the stirring blade 28, it exerts a stirring force on the lower side of the main stirring plate 30 in the stirring blade 28, and therefore also forms a part of the stirring and mixing means 26. .

As described above, the solidified lumps CS of the stagnant particles on the bottom surface 20a of the fluidization tank 20 by the crushing means 45 are crushed apart, so that a slurry is formed. In the case of rock or the like that is extremely difficult to crush, such as a rock RC, the rolling roller 47 easily gets over, so that the load on the rotation of the stirring blade 28 driven by the rotating shaft 27 is prevented from increasing. As a result, smooth rotation of the stirring blade 28 can be ensured. Further, since the clod crushing means 45 extends below the main stirring plate 30, the clod crushing means 45 also exerts a stirring function in the fluidization tank 20. In addition, the crushing means 45 has a configuration in which
Since the roller rolls on the bottom surface 20a of the zero, the stirring force surely reaches the portion of the bottom surface 20a.

As shown in FIG. 12, when the lifting rod 46 'and the rolling roller 47' are configured to be directed inward by a predetermined angle θ with respect to the axis of the main stirring plate 30, the stirring blade 28 When the roller rotates, an outward flow is formed in the fluidization processing tank 20 due to the displacement of the rolling roller 47 ′. As a result, the outward flow is reduced by the circumferential body 20b.
, The fluid is converted into an upward flow, so that the inside of the fluidization tank 20 is efficiently stirred, and a high-quality slurry in which the earth and sand and the solidified material are uniformly mixed with water is obtained.

As described above, in the fluidization treatment tank 20, an optimal fluidization treatment soil can be obtained by using poor quality soil as a backfill material. Become. This backfilling is performed by connecting a hose 43 to a discharge pipe 41 connected to the fluidization tank 20 and opening the on-off valve 43 as shown in FIG. 9C. To perform backfill more quickly and efficiently, the fluidization treatment device 10 is brought as close as possible to the excavation point. Since the running is performed by the crawler belt 16, even if there is unevenness on the ground, the vehicle can run without any particular trouble, and even if the crawler belt 16 slightly protrudes from the step, the balance of the entire vehicle is not disrupted. The fluidized soil can be supplied at a position very close to.

After backfilling of the fluidized soil in this way, although there is a time lag depending on the mixing ratio of water and the solidifying agent, the weather, etc., the fluidized treated soil takes about one hour to one day. The soil will solidify. Therefore, after sufficient solidification, the road can be restored by paving on it or the like. Moreover, since the soil that has been improved by the fluidization treatment is backfilled, it does not sneak around the fume tube 75 and no voids are formed. There is no fear. Of course, if the mixing ratio of the solidifying agent is appropriately adjusted, if excavation is necessary again, excavation can be performed with a hydraulic shovel or the like.

By using the fluidization treatment device 10 as a self-propelled type, the fluidization treatment device 10 is carried into the work site, and the soil generated by excavation at the most appropriate position is fluidized. Since it can be back-filled at the excavation point, the speed of operation is ensured. Therefore, it is possible to smoothly and quickly perform burying work such as piping on a road with a large traffic volume.
In addition, by precisely adjusting the mixing ratio of the generated soil, water, and the solidifying agent, it is possible to manufacture a fluidized soil with extremely high quality. In particular, when the amount of soil generated by excavation is small, the entire fluidization treatment device 10 can be reduced in size. Therefore, pipe burial work on narrow roads where large vehicles such as dump trucks and mixer trucks cannot be carried. It is very advantageous to perform the above. In performing the fluidization processing at the site, a hydraulic excavator and a dump truck are used in addition to the fluidization processing apparatus 10, but aside from a machine such as a hydraulic excavator that excavates earth and sand, for example, excavation is performed. A dump truck is not required when the resulting soil is directly supplied to the sieving unit 25, or when excavated generated soil is piled up to remove lumps, metal, and other foreign matter. Further, the water supply does not have to be performed from the water tank W, but can be obtained from tap water or a reservoir.

In the above-described embodiment, the rolling roller constituting the clod crushing means has a disk shape.
As shown in the above, using a polygonal rolling roller 147,
The rolling roller 147 may be connected to the same lifting rod 46 as shown in the first embodiment, and the lifting rod 46 may be connected to the main stirring plate 30 so as to be able to move up and down. With this configuration, the rolling roller 147
Rolling surface 147a has a planar shape having a predetermined length, and a corner between the rolling surfaces 147a and 147a is a bottom surface 20a.
One rolling surface 147 from the line contact with
The angle between a and the bottom surface 20a continuously decreases, and eventually the rolling surface 147a comes into surface contact with the bottom surface 20a, and this operation is repeated by the rotation of the rolling roller 147. Therefore, as a result of the soil mass being crushed as the angle of the rolling surface 147a becomes smaller,
The clod will be crushed. As described above, since the rolling surface 147a of the rolling roller 147 crushes the soil mass by crushing the soil mass, the crushing of the soil mass can be performed more efficiently.

In the first and second embodiments described above, the pressing force for crushing the earth mass is generated by the bending of the spring 49 due to the rise of the rolling roller. As shown in FIG. 15, a weight 240 may be connected to and provided at the tip of a lifting rod 246 to which rolling rollers 247 (circular or polygonal) are connected. With this configuration, the rod insertion hole 248 provided in the main stirring plate 230 may be a through-hole having a cross section slightly larger than the outer shape of the lifting rod 245. With such a configuration, rocks and the like can easily get over the rocks, and when the rolling roller 247 rides on the earth mass, the weight 2
With a pressing force of 40, the earth mass is crushed. In this case, the rod insertion hole 248 through which the lifting rod 246 is inserted can be formed in a uniform shape over the entire length of the main stirring plate 230 in the thickness direction, so that the rod insertion hole 248 and the rod insertion hole 248 are inserted into the rod insertion hole 248. The shape of the elevating rod 245 can be simplified. In addition, since no spring is provided, the lifting rod 245 can have an extra lifting stroke corresponding to the length of the spring when it is most contracted, and can move over a larger solid object. .

[0047]

As described above, according to the present invention, since the stirring blade is provided with the clod crushing means for crushing the clumps of soil deposited on the bottom of the fluidization tank, the stirring blade is supplied to the fluidization tank. Even when the solidified soil contains a solidified solid mass, the solid mass can be reliably crushed and turned into a slurry.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of a fluidization treatment method.

FIG. 2 is a front view of a self-propelled fluidization apparatus showing one embodiment of the present invention.

FIG. 3 is a plan view showing a main part of the vehicle body frame in FIG. 2;

FIG. 4 is a sectional view taken along line XX of FIG. 3;

FIG. 5 is an external perspective view of the stirring and mixing means of FIG.

FIG. 6 is a plan view of a fluidization tank showing one embodiment of the present invention.

FIG. 7 is a plan view of a main part of a main stirring plate constituting a stirring blade provided in the fluidization tank of FIG. 6;

8 is a sectional view taken along line YY of FIG. 7;

FIG. 9 is an operation explanatory view showing a procedure of a pipe burying operation performed by using the self-propelled fluidization apparatus according to the embodiment of the present invention.

FIG. 10 is an operation explanatory view of the clod crushing means shown in FIG.

FIG. 11 is an operation explanatory view in a state different from FIG. 10;

12 is a configuration explanatory view showing an example in which the rolling roller shown in FIG. 8 is attached obliquely to a main stirring plate.

FIG. 13 is a cross-sectional view showing a clod crushing means showing a different embodiment of the present invention.

FIG. 14 is a cross-sectional view showing a clod crushing means showing still another embodiment of the present invention.

FIG. 15 is an operation explanatory view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Self-propelled fluidization processing apparatus 12 Body frame 20 Fluidization processing tank 20a Bottom surface 20b Circumferential trunk 25 Sieving unit 26 Stirring / mixing means 27 Rotary shaft 28 Stirring blade 29 Hydraulic motor 30,230 Main stirring plate 31 Auxiliary stirring plate 45 Means 46, 46 ', 246 Lifting rods 47, 47', 147, 247 Rolling rollers 48, 248 Rod insertion holes 49 Spring 240 Weight

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E02F 7/00 B28C 5/26 // B28C 5/26 7/00 7/00 B09B 3/00 301E (72 ) Inventor Ryuji Takada 650, Kandate-cho, Tsuchiura-shi, Ibaraki Pref. In the Tsuchiura plant of Hitachi Construction Machinery Co., Ltd. 4D004 AA32 CA04 CA50 CB13 CB27 CB43 CB50 CC03 CC11 4D063 CC01 GA10 GB02 GC05 GC07 GD04 4G056 AA06 AA25 CC13 CD11 CD64 4G078 AA02 AA03 AB01 BA05 CA18 DA06 DB08 EA05 EA10 4H026 CA01 CA02

Claims (5)

[Claims] 1. A stirring blade is horizontally extended on a rotating shaft arranged vertically in a fluidization tank into which earth and sand, water, and a solidifying agent are charged, and the rotating shaft is rotated by a rotation driving means. When the contents are stirred and mixed by being driven, and discharged from the lower side surface of the fluidization treatment tank, the stirring blade has a crushed earth mass for crushing the earth mass retained at the bottom of the fluidization treatment tank. A fluidization treatment apparatus characterized by comprising means. 2. The method according to claim 2, wherein the mass crushing means is provided with a mass pressurizing part which can be slidably contacted with a bottom surface of the fluidization treatment tank at a lower part of a lifting rod vertically suspended from the stirring blade so as to be able to move up and down by a predetermined stroke. The fluidization treatment device according to claim 1, wherein: 3. The fluidization processing apparatus according to claim 2, wherein the earth mass pressurization unit has a rolling surface that can roll along a bottom surface of the fluidization processing tank. 4. A configuration in which the mass crushing unit is brought into contact with the bottom surface of the fluidization tank with a predetermined pressing force by the weight of the mass crushing unit or by a predetermined urging unit. The fluidization treatment device according to claim 3, wherein 5. The fluidizing apparatus according to claim 2, wherein said mass pressurizing section has a lifting stroke capable of climbing over at least solid matter staying at the bottom of said fluidization tank. Processing equipment.