JPH11158913A - Hydraulic shovel provided with fluidization treatment mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform fluidization treatment of excavated soil from excavation of sand and soil singly by a hydraulic shovel, and perform work of backfilling of produced fluidization treated soil. SOLUTION: A sub-turning frame 15 provided with a front working mechanism 17 and a driver's cab 18 mounted on the front region of the main turning frame 14 of an upper part turning body 13 turnably set in a crawled type lower running body 10, and a counter-weight 26 and a building 27 are mounted on a rearward area. A working oil tank 30, a fuel tank 31 and a fluidity treatment mechanism 32 are mounted on the intermediate area. In the fluidization treatment mechanism, a fluidization treatment tank 33 provided with stirrer in the inside is provided, water is supplied to the tank 33, sand and soil excavated by the front working mechanism 17 is charged, further a solidification agent is put, and fluidization treated soil obtained by stirring and mixing by the stirrer is backfilld at a part excavated by the front working mechanism 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic excavator used for excavating earth and sand at a civil engineering site or a construction site, and more particularly to a hydraulic excavator used for fluidizing excavated soil and backfilling it. The present invention relates to a hydraulic excavator having a processing mechanism.

[0002]

2. Description of the Related Art As is well known, a hydraulic excavator is provided with an upper revolving structure rotatably mounted on a lower traveling structure, and performs predetermined work such as excavation of earth and sand on the upper revolving structure. For the front work mechanism. Therefore, by moving the vehicle to a predetermined work position and driving the front work mechanism, required work such as excavation of earth and sand can be performed. As an example of civil engineering work performed using this type of hydraulic excavator, for example, there is a work of laying city gas pipes and sewage pipes under the road, but this work first peels a layer of pavement such as asphalt, Excavation of earth and sand to a predetermined depth secures a space for burying pipes, and installs pipes in this space. Then, after the earth and sand are backfilled, compaction is performed, and pavement is performed thereon again.

[0003] In the above construction, each operation of peeling, excavating and backfilling asphalt can be performed using a hydraulic excavator. After installing the piping in place,
The excavation site is backfilled, and this backfilling is generally performed using excavated earth and sand. However, depending on the geological layer or the like on which the pipe is laid, the soil generated by the excavation has a poor soil quality, so that it cannot be used for backfilling as it is. In this way, if the excavated soil cannot be used as it is for backfilling, the excavated soil is removed from the work site and discarded, and instead, high-quality backfill soil is newly imported. It is necessary to backfill the excavation site. However, in recent years,
There is a tendency that there is a shortage of places to dispose of the generated soil, and it is sometimes difficult to easily obtain good quality backfill soil at hand.

In consideration of the above points, a so-called fluidized backfill method for improving the soil quality of soil generated by excavation and changing the soil to a soil suitable for backfill has been developed and put into practical use. ing. This fluidized backfill method is to mix the generated soil with water and a solidifying agent at an appropriate mixing ratio and stir to convert it into a uniformly mixed slurry state backfill material and backfill it at the excavation site. It is to be.

According to this fluidized backfill method, even if the soil generated by excavation is poor quality soil such as the Kanto loam layer or sludge, it can be reused for backfilling, and the generated soil can be reused. This is advantageous in that there is no need to obtain disposal and backfill soil. In addition, when backfilling with the backfill material, the backfill material is in a fluid state, and wrapping around the buried object becomes smooth, so that it is possible to prevent occurrence of backfill failure due to congestion of the buried object and eliminate the need for compaction Therefore, 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.

In order to produce the above-mentioned fluidized soil, a solidifying agent and water are added to the generated soil, and if the mixing ratio of the generated soil, water and the solidifying agent is not strictly set, it is a good backfill material. Quality cannot be obtained. Further, it is necessary to remove foreign substances and lumps from the generated soil, and to sufficiently stir the mixture. From the above, as a fluidization treatment device, a fairly large-scale facility is required, and conventionally, large-scale plant equipment is used, and therefore, the fluidization treatment is performed at a position far from the work site. Is common. For this purpose, the soil generated at the work site must be transported to this facility by a dump truck or the like to perform fluidization processing, and the treated backfill material must be transported to the work site again by a mixer truck or the like. No.

[0007]

Aside from large-scale sites such as communal trenches and shield tunnels, relatively small-scale construction sites such as those where gas pipes are buried along roads, etc. The amount of excavation and backfill of earth and sand is small. In addition, on a road with a lot of traffic, simplicity and quickness of the backfill work are required, and frequent traffic of a dump truck, a mixer truck or the like is not preferable in that traffic congestion is caused. In addition, a hydraulic excavator that performs at least work such as excavation of earth and sand is arranged at a work site, and other machines and devices, and piping to be buried may be arranged. Therefore, when the road is narrow, it may be difficult to move the dump truck to a position where the earth and sand excavated by the excavator can be smoothly loaded, and the mixer truck loaded with the backfill soil is most suitable for the backfill. You may not be able to enter the correct position. As described above, problems such as the removal of excavated soil and backfilling with fluidized soil become extremely difficult due to the state of the work site, that is, the relationship with the machines, equipment, and other objects arranged around the work site. There is a point.

The present invention has been made in view of the above points, and an object of the present invention is to provide a hydraulic shovel for excavating soil and the like, which has a mechanism for fluidizing excavated soil. Accordingly, a single machine can perform a series of operations from excavation of earth and sand to fluidization of excavated soil and backfilling.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention relates to an excavating soil excavated by a front working mechanism on an upper revolving unit which is rotatably mounted on a lower traveling unit having a crawler type traveling unit. A fluidization processing tank for performing fluidization processing is provided, and among the mechanisms installed on these upper revolving units,
The front working mechanism and the driver's cab are provided at a position forward of the center of rotation of the upper rotating body, and the sub-slewing body is capable of reciprocatingly swinging at least between the excavation position and the position at which the earth and sand is charged into the fluidization processing tank. The fluidization treatment tank is installed at the top, at least the center of gravity of the tank is disposed rearward from the center of rotation, and the building is arranged at the rearmost portion of the upper revolving structure. It is a feature.

Here, the fluidization treatment tank is for mixing the excavated soil with water to form a slurry, and adding a solidifying agent to produce the fluidized treatment soil. A stirrer for stirring is fixedly or detachably attached to the fluidization tank. Since the front working mechanism excavates earth and sand, it is necessary to prevent the balance of the entire vehicle from being lost due to excavation resistance. On the other hand, it is preferable to arrange the fluidization processing tank at a position as close as possible to the front operation mechanism, because the bucket in the front operation mechanism inputs earth and sand into at least the fluidization processing tank. Since heavy equipment such as engines and hydraulic pumps are installed in the building,
By arranging the building at the rear, it also functions as a counterweight. Therefore, the building should be located as far back as possible, but a counterweight should be installed at the rear end of the upper revolving structure, and the building should be provided at a position including the upper part of the counterweight by utilizing the space above the counterweight. Is preferred from the viewpoint of weight balance and the like. In addition, fuel tanks and hydraulic oil tanks are installed on hydraulic excavators.The locations of these tanks are not particularly restricted, but they should be arranged along the side of the fluidization tank. It is reasonable.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. First, the procedure of the fluidization process will be described with reference to FIG. In the figure, 1 is a fluidization tank and 2 is a stirring and mixing means. First, as shown in (a) of FIG.
In this state, the generated soil G is put into the fluidization tank 1 in this state, as shown in FIG. It is preferable to remove lumps such as rocks and concrete pieces and solid foreign matters such as metal before charging the generated soil G.
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. Thus, by simultaneously performing the charging of the generated soil G and the stirring by the stirring and mixing means 2,
Water W and generated soil G can be mixed smoothly. However, the supply order of water and generated soil is not limited to this.

While the generated soil G is added to the water W, the contents of the fluidization tank 1 are stirred by the stirring and mixing means 2 to uniformly mix the generated soil G and the water W to form a slurry. After the water content of the generated soil G is adjusted in this way, while stirring by the stirring and mixing means 2 is continued,
As shown in FIG. 1 (c), a fixed amount of the solidifying agent C is added, the solidifying agent C is uniformly mixed with the slurry S, and the contents are completely stirred by the stirring and mixing means 2 to completely complete the whole. Make it uniform. As a result, soil that is not suitable for backfill, such as the Kanto loam layer, can be converted into an effective backfill material, and the excavated portion can be backfilled with the soil generated by excavation. In addition, since the fluidized soil, which is the backfill material, solidifies in about 1 to 24 hours after backfilling, the wrapping around the buried object becomes good, and compaction is not required. Then, since the strength after solidification can be adjusted by the mixing ratio of the solidifying agent, it becomes possible to excavate the backfilled place again. Here, generated soil G
Since the mixing ratio of the water, the water W, and the solidifying agent C changes according to the properties of the generated soil G, the water content, and the like, it is preferable that the mixing ratio be determined in advance by an experiment or the like before performing the actual fluidization treatment.

The generated soil is fluidized as described above. This fluidized processing mechanism is mounted on a hydraulic excavator so that the fluidized processing and backfilling can be performed in parallel with excavation of earth and sand. . FIG. 2 shows the overall configuration of a hydraulic shovel provided with a fluidization processing mechanism. In the figure,
Reference numeral 10 denotes a lower traveling body.
1. It is composed of crawler type left and right running means having
The crawler belt 11 is driven by a traveling hydraulic motor. A main slewing device 12 driven by a hydraulic motor 12a
The upper turning body 13 is mounted so as to be able to turn via the.
Since these structures are not particularly different from those of the related art, detailed description of the undercarriage 10 and the main turning device 12 will be omitted.

The upper swing body 13 has a main swing frame 14 connected to the main swing device 12.
Is equipped with various devices having a function as a normal hydraulic excavator. In addition, a fluidization mechanism is provided. These devices and the like are arranged on the upper swing body 13 as shown in FIG. Due to the arrangement relationship of these devices, the upper swing body 13 can be functionally divided into three regions F, M, and B in the front-rear direction.

First, the main revolving frame 1 is located in the front area F.
A sub-swirl frame 15 that can be turned at a predetermined angle in the horizontal direction with respect to the sub-swing 4 is provided. It is provided connected. The sub-rotating device 16 is constituted by a circular turning table, and, similarly to the main turning device 12, a hydraulic motor 16a as a turning drive means.
And is turned. A front working mechanism 17 and a driver's seat 18 are mounted on the auxiliary turning frame 15. The front working mechanism 17 includes the sub-rotating frame 1
5, a boom 19 connected to the boom 19 so as to be able to move up and down, an arm 20 is connected to the tip of the boom 19 so as to be rotatable in the vertical direction, and a bucket 21 as a front attachment has a link mechanism 22 at the tip of the arm 20. It is connected rotatably through the. And boom 19, arm 2
The link mechanism 22 connected to the 0 and the bucket 21 is driven by a boom cylinder 19a, an arm cylinder 20a, and a bucket cylinder 21a, respectively. In addition, bucket 2 as a front attachment
1 is detachable, and other working means such as a crusher can be interchangeably mounted in place of the bucket 21. The driver's seat 18 is loaded with an operator, and various operations such as traveling of the vehicle by the lower traveling body 10, turning of the main turning frame 14 and the sub turning frame 16, and operation of the front working mechanism 17 are performed. For this purpose, for example, a plurality of operation levers 23 are provided on both left and right sides of the driver's seat 18 as operation means.

Here, the main turning frame 14 can turn 360 degrees with respect to the lower traveling body 10.
As shown in FIG. 3, the turning angle of the sub turning frame 16 with respect to the main turning frame 14 is limited. The sub-swirl frame 16 is for reciprocatingly turning the front working mechanism 17 between an excavation position in front of the vehicle and an upper position of a fluidization tank 33 described later. It has a turning angle of about 270 °. As described above, the pair of stopper members 24a and 24b are provided on the sub-rotating frame 16 in order to limit the turning angle, and the stopper portions 24a and 24b are selectively engaged with the main turning frame 14. The turning restricting member 25 is fixedly provided. Therefore, the auxiliary turning frame 14 can turn from the position where the stopper portion 24a contacts the turning restricting member 25 to the position where it contacts the stopper 24b.

Next, in the rear area B, a counter weight 2 is set.
6 and a building 27 are installed. Here, the counter weight 26 is provided so as to project rearward from the main swing frame 14, but the building 27 is
Is installed at a position from the rear position to the position above the counterweight 26. In the building 27, devices such as an engine 28 and a hydraulic pump 29 are installed.
The rear side of the building 27 is an opening / closing door 27a. The front working mechanism 17 excavates earth and sand. Therefore, if the rear side is light, the front and rear balance of the entire vehicle cannot be obtained due to resistance during excavation, and the vehicle is inclined forward. The reason why the counterweight 26 is provided in the rear area B of the upper swing body 13 is to stabilize the vehicle when excavating earth and sand. However, in order to stabilize the vehicle at the time of excavation by using only the counterweight 26, it is necessary to provide a suitable weight, and for this purpose, the outer shape becomes large. In order to minimize the overhang of the upper revolving unit 13 to minimize the turning radius and to effectively exhibit the function of stabilizing the vehicle during excavation, there is a heavy weight installed on the upper revolving unit 13. The building 27 in which the equipment, that is, the engine 28 and the hydraulic pump 29 and the like are installed, is also installed at the rear end similarly to the counterweight 26, thereby exhibiting the function as the counterweight.

A predetermined space is formed between the front area F and the rear area B due to the arrangement of the building 27 above the counterweight 26. Therefore, using this space as the intermediate area M, the hydraulic oil tank 30, the fuel tank 31, and the fluidization processing mechanism 32 are installed. Here, the intermediate region M includes the mounting portion of the center joint 12b in the main turning device 12, that is, the turning center, and the fluidization processing mechanism 32 is installed at a position from the vicinity of the turning center to the rear region B side. The center of gravity is located behind the center of rotation. The hydraulic oil tank 30
The fuel tank 31 is arranged along the side of the fluidization mechanism 32.

The fluidization processing mechanism 32 includes a fluidization processing tank 3
The fluidization tank 33 has a cubic shape in order to effectively utilize the space of the intermediate area M and to have a maximum capacity. The upper part of the fluidization tank 33 is open, and water, earth and sand, and a solidifying agent are injected or injected through the opening. However, when the earth and sand are charged, solid foreign substances such as stones, concrete lumps, and even metals may be mixed. Therefore, in order to eliminate these in advance, a sieve or the like is provided at the upper part of the fluidization tank 33. You may comprise.

A stirring device 34 is provided in the fluidization tank 33.
Is provided. The stirring device 34 includes a plurality of stirring blades 37 radially mounted on a rotating shaft 36, both ends of which are rotatably supported by bearings 35, 35 on side walls of a fluidization tank 33.
The fluidizing tank 3 is driven by rotating the stirring blade 37 by the rotating shaft 37.
3 can be agitated. Here, the stirring blade 3
7 are provided in parallel with two rotating shafts 36.
As shown in FIG. 5 and FIG.
(In FIG. 6, in order to distinguish the two rotating shafts, one rotating shaft is denoted by 36a and the other rotating shaft is denoted by 36b.) Of the rotating shaft 36a, an end portion for stirring drive is provided. The hydraulic motor 38 is connected, but the other rotary shaft 3
6b is not directly connected to the hydraulic motor 38. A pulley 39 is attached to an end of the rotating shaft 36b, and a pulley 40 is also attached to the rotating shaft 36a. A transmission belt 41 is provided between the pulleys 39 and 40 by being wound. Thus, when the hydraulic motor 38 is driven to rotate, the rotating shaft 36a is directly driven to rotate, and the other rotating shaft 36b is also driven to rotate via the transmission belt 41.

The fluidizing tank 33 is provided with the main revolving frame 1.
4 is installed directly via a vibration-proof support member 42. The fluidization tank 33
A load cell 43 is attached to the lower part of the load cell. Therefore,
This load cell 43 can measure the weight of water and earth and sand introduced into the fluidization tank 33, and also the amount of the solidifying agent added. A water supply pipe 44 is provided at an upper portion of the fluidization processing tank 33, and one end of the water supply pipe 44 is opened in the fluidization processing tank 33, and the other end is provided outside the fluidization processing tank 33. It is extended, and its end serves as a connection part 44a of a hose for water supply. Therefore, if water is supplied by connecting the hose to the water supply pipe 44, the water can be injected into the fluidization tank 33.

On the other hand, earth and sand are supplied by the front working mechanism 17.
The soil excavated by the bucket 21 of the front working mechanism 17 is temporarily placed, or directly put into the fluidization tank 33 as it is. Furthermore, the solidifying agent is temporarily placed on the ground, and this is scooped up by the bucket 21 of the front working mechanism 17,
In the case where the solidifying agent is put into the fluidization tank 33 or a bag-containing solidifying agent is used, the solidifying agent bag may be manually lifted up, and the solidifying agent may be directly put into the fluidizing tank 33. It can also be configured as shown in FIG. That is, the solidifying agent is stored in the solidifying agent container 50, and the solidifying agent container 50 is held by the L-shaped reversing member 51 by the holder 51a. And
The reversing member 51 is reversibly connected to a horizontal portion of a support rod 52 erected on the main turning frame 14. Also,
A hydraulic cylinder 53 is pivotally mounted between the lower surface of the reversing member 51 and the main turning frame 14.
When the reversing member 51 is reversed around the support rod 52 by 3, the solidifying agent container 50 is inverted, and the solidifying agent is supplied into the fluidization tank 33.

Further, a pipe 45 for discharging the fluidized soil is connected to the lower surface of the fluidized tank 33 in order to backfill the fluidized soil generated in the fluidized tank 33 to the excavation site. ing. This discharge pipe 45 is as shown in FIG.
As is clear from FIG. 9, it is led to a recess 14a formed on the side of the main turning frame 14 through a space formed inside the main turning frame 14, and the tip thereof is provided with an on-off valve. It is a hose connection part 45a. Therefore, if a hose for discharging the fluidized soil is connected to the hose connection portion 45a and the on-off valve is opened, the fluidized soil can be supplied from the fluidization tank 33 to the excavation site for backfilling. I have. An opening / closing lid 46 is provided below the side surface of the fluidization processing tank 33. By opening the opening / closing lid 46, the inside of the fluidization processing tank 33 is cleaned, Can be discharged.

With the construction of the hydraulic excavator as described above, all the steps of the construction work for burying the pipe under the road can be performed using substantially only the hydraulic excavator. In order to bury pipes, first, earth and sand are excavated to secure a space for burying pipes, and a framework is formed in the buried space to prevent inflow of sand and to supply fluidized treated soil. To prevent spills. Thereafter, the backfill material fluidized by the fluidizing mechanism 32 after the installation of the pipes or the like is supplied to backfill.

In the above-described work procedure, first, for excavation of earth and sand, the front operation mechanism 17 in the hydraulic excavator is operated to excavate earth and sand. The excavation begins by stripping the asphalt and then excavating the ground to make room for the pipes. Here, if the asphalt is peeled, the ground may have irregularities and the like. However, since the excavator runs on the crawler belt 11, even on a rough road having considerable irregularities, the traveling may be hindered. There is no fear of coming. The upper swing body 13 is provided with a sub-swivel frame 15 on a main swivel frame 14, and the front working mechanism 17 is mounted on the sub-swivel frame 15. Without
Since the excavation can be performed while the sub-rotation frame 15 is rotated in an appropriate direction, it is convenient when the excavation work is performed in a narrow place. Then, as shown in FIG. 10, the earth and sand excavated by the front working mechanism 17 is temporarily placed at a predetermined position. In addition, at the time of this temporary placement, if solid foreign substances such as rocks, concrete pieces, and metals are separated and removed using, for example, a sieve, fluidization can be performed more smoothly and efficiently. However, depending on the excavation place, etc., the excavated soil may
You can also put it in.

As described above, a pipe installation space having a predetermined width and length is formed, and sediment from the surroundings flows into this space, and when the fluidized soil is supplied, unsolidified fluidized soil is supplied. To prevent spills, earth retaining measures should be taken by providing a framework for the space. That is, as shown in FIG. 11 and FIG. 12, the frame for partitioning the piping installation space is composed of earth retaining plates 60, 60 on the left and right in the length direction and front and rear outflow regulating plates 61, 61. . The earth retaining plate 60 is for preventing earth and sand on the side surface of the excavated portion from collapsing and flowing into the piping installation space, and the outflow regulating plate 61 is for preventing unsolidified fluidized soil from flowing out. It is for. The retaining plate 60 and the outflow regulating plate 61
In order to hold the frame at a predetermined position, partition piles 62 are driven into four corners constituting the framework. These partition piles 62 are provided with grooves 62a through which the outflow control plates 61 are inserted. Further, in order to prevent the left and right earth retaining plates 60, 60 from being pushed out due to the collapse of the earth and sand from the left and right, at least two jacks 63 are interposed between the earth retaining plates 60, 60, and left and right. Earth retaining plate 60,6
The interval between 0 is kept at a predetermined interval. Furthermore, in order to install the front and rear outflow writing plates 61, 61 so as to straddle the vicinity of both ends of the pipe 64, an arc-shaped notch 61a is provided.
Are formed.

Here, FIGS. 11 and 12 show a case where a pipe 64 to be taken over is buried in a portion where the pipe is already buried. Since the pipe 64 having a predetermined length following the previous pipe burying portion is buried, one of the pipes for preventing the fluidized soil supplied during the previous work from flowing forward in an unsolidified state is provided. An outflow control plate 61 and partition piles 62, 62 for positioning and holding the outflow control plate 61.
And are still attached. Therefore, what is newly attached when constructing the framework are the two front partition piles 62, 62, the left and right earth retaining plates 60, 60, and the front outflow regulation plate 61. As a result, the pipe burying space is sectioned from another part in a stable state. The driving of the partition piles 62 and the mounting of the earth retaining plate 60 and the outflow regulating plate 61 which constitute a frame for forming the pipe burying space can be performed manually. When the control plate 61 is mounted, it may be lifted by the front working mechanism 17. For this purpose, the soil retaining plate 60 and the outflow regulating plate 61 are respectively provided with through holes 60a and 60 through which hooks are inserted.
1a is provided at an appropriate place. Further, the pipe 64 cannot be accurately installed only by forming the pipe installation space by excavation. Therefore, before or after the formation of the framework, the bottom surface is leveled. This leveling can be performed by arranging the sleepers 65 as shown in FIG. Also,
In addition to this, for example, pouring concrete or compacting the soil can be performed.

During or after the above operation is completed, the fluidization processing mechanism 32 is operated to
The fluidized soil is generated from the excavated soil by the procedure shown in (1). For this purpose, first, a predetermined amount of water is injected into the fluidization tank 33. The water can be injected by pulling out a hose from a water tap and connecting it to a water supply pipe 44, or using a water supply tank and connecting a water supply hose from this water supply tank to the water supply pipe 44.
It can be performed by connecting to a device. In addition, water such as rivers can be used. Then, since the water injection amount can be detected by the load cell 43, the water injection is stopped when a predetermined amount of water is supplied into the fluidization tank 33.

Next, the earth and sand from which solid foreign matter has been removed in advance is temporarily removed from the temporary storage portion of the excavated soil by the bucket 2 of the front working mechanism 17.
The rotary shaft 36 constituting the agitating device 34 is driven to rotate by a hydraulic motor 38 while being charged into the fluidization processing tank 33 using 1. By rotating the stirring blade 37 attached to the rotating shaft 36, the earth and sand charged in the fluidization tank 33 is uniformly stirred and mixed with water to form a slurry.
Here, the input amount of earth and sand can also be detected by the load cell 43, so that the mixing ratio of water and earth and sand can be appropriately maintained.

After the inside of the fluidization tank 33 is almost completely slurried, or before that, the solidifying agent is introduced into the fluidization tank 33 while stirring is continued.
Although it is possible to detect the input amount of the solidifying agent by the load cell 43, since the mixed amount of water and soil is detected,
The solidifying agent in an amount corresponding to these amounts may be measured and then added. In any case, the mixing ratio of water, earth and sand, and the solidifying agent can be easily set to a predetermined value. Then, the fluidized soil is generated by uniformly mixing the solidifying agent with the slurry. Therefore, as shown in FIG. 13, a hose 66 for discharging fluidized soil is connected to the hose connection portion 45a of the supply pipe 45,
The fluidized soil is supplied by opening the open / close valve of the hose connection portion 45a with the airbag facing the space where the pipe 64 is arranged.

By repeating the above operation one or more times, it is possible to fill the installation space of the pipe 64 provided with the framework with the fluidized soil up to a predetermined height level. Here, since the fluidized soil has a considerably high degree of fluidization, the fluidized soil is smoothly wrapped below the pipe 64, and the fluidized soil is completely formed without any voids or the like in any of these spaces. The pipe 64 can be buried. However, at a stage before the jack 63 is filled with the fluidized soil and when the fluidized soil is filled to such an extent that the retaining plate 60 is not crushed by the surrounding earth and sand, the jack 63 is filled.
Remove. After the fluidized soil is completely filled, the retaining plate 60 is extracted. Since the fluidized soil is still kept in a fluidized state, the outflow control plate 61 is left as it is. The work of removing the retaining plate 60 and the like can also be performed using the front working mechanism 17.
Further, even if the earth retaining plate 60 is removed, the fluidized soil easily flows into the space, so that there is no possibility that a void or the like is formed in this portion.

After backfilling of the fluidized soil, there is a time lag depending on the mixing ratio of water and the solidifying agent, the weather, etc., but the fluidized soil is solidified in about one hour to one day. become. 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, there is no danger of sneaking around the pipe 64 and creating a gap or the like. There is no fear.

As described above, since all operations from excavation to backfilling can be performed by one hydraulic excavator,
There is no need to secure a loading / unloading route for dump trucks and mixer trucks, and burying work such as piping on roads with heavy traffic can be performed smoothly and quickly. Moreover, since there is no need to carry extra machines to the work site, a large work space can be secured. Furthermore, since the mixing ratio of the generated soil, water and the solidifying agent can be accurately adjusted, extremely high quality fluidized soil can be produced. In particular, when the amount of soil generated by excavation is small, the entire fluidization treatment mechanism can be reduced in size, so pipe burial work on narrow roads where large vehicles such as dump trucks and mixer trucks cannot be carried in, etc. It is extremely advantageous to perform Also, since the traveling system using the crawler belt 11 is adopted as the lower traveling body 10, even if there is unevenness or the like on the ground after the asphalt is peeled off, the vehicle can travel smoothly.
In addition, the backfill work can be performed at a position immediately adjacent to the excavation point. Further, since the respective mechanisms in the upper revolving unit 13 are rationally arranged in consideration of the front and rear weight balance, the resistance of the front working mechanism 17 during excavation of soil causes the balance of the entire vehicle to collapse and become unstable. There is no such thing as it is.

[0034]

According to the present invention, the hydraulic excavator is equipped with a fluidization processing mechanism as described above, and the excavated earth and sand can be excavated by the front working mechanism of the hydraulic excavator and the excavated soil can be put into the fluidization processing tank. The excavated soil is excavated and the excavated soil is fluidized, and the generated fluidized soil can be backfilled with a hydraulic excavator alone, ensuring smooth and prompt work. At the same time, it is not necessary to carry in and carry out the dump truck and the mixer truck, so that it is extremely advantageous in performing the above-mentioned work on a narrow and frequently-traffic road or the like.

[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 of FIG. 2 omitting a front working mechanism.

FIG. 4 is an operation explanatory view of a sub-rotating frame.

FIG. 5 is a side view of a fluidization processing tank.

FIG. 6 is a sectional view taken along line XX of FIG. 5;

FIG. 7 is a configuration explanatory view showing an example of a solidifying agent charging mechanism.

FIG. 8 is a view as seen from the back side of FIG. 5;

FIG. 9 is an explanatory diagram of a configuration of a discharge pipe.

FIG. 10 is an operation explanatory view of the hydraulic excavator with the excavation mechanism, showing a state of excavation of earth and sand.

FIG. 11 is a configuration explanatory view showing an installation state of a framework for partitioning a pipe installation space.

FIG. 12 is a sectional view taken along the line YY in FIG.

FIG. 13 is an operation explanatory view showing a backfill state of the fluidized soil.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Lower traveling body 11 Crawler belt 12 Main revolving device 13 Upper revolving structure 14 Main revolving frame 15 Sub revolving frame 16 Sub revolving device 17 Front working mechanism 18 Driver's seat 24a, 2
4b Stopper Member 25 Turning Control Member 26 Counter Weight 27 Building 28 Engine 29 Hydraulic Pump 32 Fluidization Processing Mechanism 33 Fluidization Processing Tank 34 Stirrer 44 Water Supply Pipe 45 Discharge Pipe

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsushiro Miura 2-6-2 Otemachi, Chiyoda-ku, Tokyo Within Nikko Construction Machinery Co., Ltd. Construction Machinery Co., Ltd.

Claims (5)

[Claims] 1. A front working mechanism and an operator's cab for performing operations such as excavation of earth and sand, and an apparatus including an engine and a hydraulic pump are mounted on an upper revolving body which is rotatably mounted on a lower traveling body having a crawler type traveling body. In the hydraulic excavator in which the building for storing is installed, the upper revolving structure further includes a fluidization processing tank for performing fluidization processing of excavated soil by the front working mechanism, and the front working mechanism and the operator cab are provided with:
The front working mechanism is provided at a position forward of a center of rotation of the upper rotating body, and at least the front working mechanism is installed on a sub-revolving body that can reciprocate between a digging position and a position where earth and sand are charged into the fluidization processing tank. The fluidization processing mechanism is characterized in that at least the center of gravity of the fluidization processing tank is arranged behind the center of rotation, and the building is arranged at the rearmost portion of the upper revolving unit. With hydraulic excavator. 2. The fluidization treatment tank is for mixing the excavated soil with water to form a slurry and adding a solidifying agent to produce the fluidization treatment soil. 2. The hydraulic shovel according to claim 1, further comprising a stirrer for mixing and stirring the contents. 3. The fluidization tank is provided with a water supply pipe at an upper part thereof and a drainage pipe for fluidization treatment soil connected to a lower part thereof, and the discharge pipe is connected to a side part of the upper rotating body. 3. The hydraulic excavator with a fluidization processing mechanism according to claim 2, wherein a hose connection part having an on-off valve is provided on the hydraulic excavator. 4. The hydraulic shovel according to claim 1, wherein the building is provided at a position including an upper portion of a counterweight installed at a rearmost position of the upper swing body. 5. The hydraulic excavator with a fluidization processing mechanism according to claim 1, wherein a fuel tank and a hydraulic oil tank are arranged on a side portion of the fluidization processing tank.