JPH10204870A - Plant for onboard ground improvement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unnecessitate assembling and disassembling working by making a cement silo having an auger screw inside thereof compact, and mounting a large diameter pile ground improvement method plant on a vehicle. SOLUTION: With regard to vehicles 1, 1', the rear parts thereof are carried in to mutually be opposed, and after a prescribed amount of water is fed to a water tank, the prescribed amount of water and a prescribed amount of a chemical admixture are supplied to a mixing plant 3. Next, a horizontal auger screw and a vertical auger screw in a cement silo are rotated, a prescribed amount of cement is supplied, and cement, the chemical admixture and water are mixed and agitated to adjust cement milk by supplying the prescribed amount of cement to the mixing plant 3 and performing agitating by an underwater pump. Adjusted cement milk is charged into a drilled ground by means of an ultra-high pressure pump 9 and water from an agitator 4. At this time, a compressor is simultaneously used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant for an on-board ground improvement method in which equipment used for a ground improvement method is mounted on a large vehicle, and the necessity of assembling work and demolition work on site is eliminated. .

[0002]

2. Description of the Related Art In recent years, in urban civil engineering works such as subways, water and sewage systems, common ditches, and underpasses, the construction depth of underground structures has been deepening, so that temporary construction works have been increased in size. Most of the work is done on the road. Prior to the construction of underground structures in urban civil works, various temporary construction methods have been adopted.

[0003] The soil layer structure of the underground ground in Japan is such that clayey soil such as silt and clay, sandy soil, gravel soil and the like are intertwined in a complicated manner, and the soil properties such as relative density and relative consistency are also considered. Since the construction method differs depending on the ground, measures for groundwater and the like had to be considered in the temporary construction method.

Therefore, as a temporary construction method at a large depth,
Large-diameter pile ground improvement methods with waterproofness, strength, etc. have been actively adopted.

This large-diameter pile ground improvement method requires a working site of about 150 m 2 (15 m × 10 m) as a plant facility base, and the plant is provided as a fixed plant with a base near the construction site each time. Knead hardening material such as milk and pump it directly to the construction site with a pump, or, if the construction site is far from the plant base, set up a relay base on the way and transfer the cement paste kneaded at the plant to a vacuum truck. , Transported by mixer, etc.
The agitator receives it and pumps it from the agitator to the construction site.

However, when such a large-diameter pile ground improvement method is carried out on a road due to overcrowding of a city, etc.,
Due to restrictions such as road use permission conditions, it has become difficult to secure land as a plant facility base.

In addition, there is a problem that it takes one to two days to carry the equipment into the site and assemble the site, and it takes six to eight hours for dismantling work. Not only that, the noise generated by the generator and the power source of the cement silo was terrible.However, considering the large size, assembling and dismantling, it was not possible to provide an effective soundproof wall. Because it was covered, noise could not be effectively prevented, and there was a problem that construction could not be performed, especially near nighttime houses.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and does not require assembling and dismantling at the site, and has a small space for preventing noise. It is an object of the present invention to provide a ground improvement method plant capable of performing an improvement method and capable of performing construction without difficulty even on a site with a short construction period, a narrow site, a night site, and the like.

[0009]

Means for Solving the Problems In order to achieve the above object, the present inventor has made intensive studies and found that a plant for ground improvement method used for ground improvement method is to be mounted on a vehicle. Heretofore, this type of soil improvement method plant has not been mounted on a vehicle or has been known.

[0010] As the ground improvement method plant is mounted on a vehicle, the used equipment is covered with a soundproof wall to prevent noise generated from the equipment and to improve the plant to reduce the space. This has led to the present invention.

That is, the present invention relates to a vehicle-mounted ground improvement method plant in which equipment used for the ground improvement method is mounted on a large vehicle to eliminate the necessity of assembling work and demolition work on site. A horizontal auger screw is provided on the inner bottom surface of the cement silo to face the opposite side of the cement silo.
A vertical auger screw is erected close to the tip of the gar screw, and cement is supplied into the mixing plant through the vertical auger screw.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention. A cement silo 2, a mixing plant 3, an agitator 4, a dust collector 28 and a high-pressure pump 5 are mounted on a vehicle body 1 of one large vehicle. On the body 1 'of the other large vehicle, a generator 7, an admixture container 6, an ultrahigh-pressure pump 9, and an air-compressor 10 housed in a water tank 8 are mounted. The entire equipment on both vehicles is surrounded by a soundproof wall 11. However, a generator serving as a noise source, a cement silo power unit (not shown), a compressor 10, a high-pressure pump 5, and an ultra-high-pressure pump 9
If the dust collector 28 for removing dust such as cement generated from the mixing plant is surrounded by a soundproof wall, other devices may not necessarily be surrounded by the soundproof wall.

In the present invention, as shown in FIG.
The auger screws 19, 19 'are laid horizontally, and the cement is mixed through a vertical auger screw 20 erected near the center of the tip of the auger screws 19, 19'. 3 are supplied. The vertical auger screw 20 is rotatably mounted on the pipe 22.

Conventionally, as shown in FIG. 8, a single auger screw-1 is provided on the bottom of a cement silo 21 '.
9 ″ was laid horizontally, and cement was supplied into the mixing plant through a vertical auger screw 20 ′.

[0015] By adopting the horizontal biaxial type as in the present invention, approximately twice as much cement per unit time as the conventional type can be obtained in the vertical type.
Since it is sent to the gas screw 20, it is inevitably pressurized, so that cement can be mixed in a short time in the mixing plant 3.
As shown in FIG. 11, the compacted portion can be made smaller than the conventional device of FIG. 10, so that clogging of the cement can be prevented. Conventionally, as shown in FIG. 10, since a single auger screw 19 '' was used, it was necessary to enlarge the consolidation portion in order to obtain a predetermined ascending speed. Had the problem of clogging.

Also, by adopting the horizontal biaxial system,
Since the lengths of the gas screws 19, 19 'and 20 could be reduced, the problem of deformation and distortion of the auger screw caused by rotation could be solved.

Conventionally, a vertical auger screw-2 is used.
0 ′ is a square cement silo 2 as shown in FIG.
1 ', but according to the present invention, the vertical auger
Since the screw 20 could be shortened, it could be provided in the square cement silo 21 as shown in FIG. 13, so that the device could be made more compact.

Conventionally, a vertical auger screw-2 is used.
0 'was simply located close to the bottom surface of the cement silo 21' as shown in FIG. 8, so that cement could not be sent when the amount of cement was low. There was a problem that remained in the '.

According to the present invention, as shown in FIG.
Since the gas screws 19 and 19 'are disposed in the grooves 31 and 31' formed in a semicircular cross section, cement is hardly left in the cement silo and supplied to the mixing plant 3. Can be sent. To drop the auger screws 19, 19 'into the concave grooves 31, 31', more than half of the auger screws 19, 19 'are located in the concave grooves 31, 31'. It is preferred that the auger screw and the concave grooves 31 and 31 'be located close to each other.

The tips of the auger screws 19 and 19 'are formed in a flat portion having the same depth as the concave portion in the direction of cement advance, and the lower end of the vertical auger screw 20 is formed in the flat portion. Is located.

In the mixing plant 3, as shown in FIG. 17, two underwater mixers 14 are provided. The underwater mixer 14 has a stirring blade 33 attached to a lower end thereof, and a safety cover 34 is attached to the stirring blade 33.

Conventionally, stirring and kneading were performed with a large-diameter blade, but the use of the underwater mixer 14 has made it possible to knead uniformly and quickly without unevenness.

In the mixing plant 3, the load cell for measuring the cement or the like while moving to the work site may be slightly displaced, and the guide rail of the load cell requires a long time to correct the load cell to the correct center. There was a problem that took time.

In the present invention, as shown in FIG.
Compression type load cells 35 are respectively disposed on the lower surface of three ring-shaped flange portions 41 disposed at equal intervals on the outer periphery of the mixing plant 3, and the shaft correcting device 42 is located on the lower surface of each load cell 35. This makes it very easy to make corrections to the center.

As shown in FIGS. 15 and 16, the shaft correcting device 42 according to the present invention has the lower end of the screw rod 37 screwed and fixed to the vehicle carrier 43, and the upper end thereof is positioned at the lower surface of the load cell 35. A substantially conical male member 44 fixed to the screw 37 is
The female member 38 closely fitted to the male member 44 is fitted to the screw rod 37, and the nut 39 is connected to the female member 38 via a disc-shaped plate 45.
The female member 38 is tightly fitted to the male member 44 by being pressed from above, so that the screw rod 37 is accurately in an upright state. In this upright state, the tip of the screw 37 is connected to the load cell 35.
By adjusting the load cell 35 to the specified position,
Even if it is distorted, it can be easily corrected to the specified position.

In the above embodiment, the compression type load cell is used. However, the axis can be corrected in the same manner with a hanging type load cell.

The cement discharged from the cement discharge port 46 of the vertical auger screw 20 is supplied to the mixing plant 3 through a pipe connected to the discharge port 46. The water supplied from the water tank 8 and the admixture supplied from the admixture container 6 are stored in the mixing plant 3 in advance. By mixing them in the mixing plant 3, the cement milk is adjusted. The adjusted cement milk is sent to an agitator 4 provided below the mixing plant 3.

Agitating blades are accommodated in the agitator-4, and the cement milk is agitated by the agitating blades to prevent the cement from separating.

In the above-described embodiment, as shown in FIG. 3, a single-sided adhesive is provided between the metal plate 12 and the porous panel 13 as a sponge 14 made of a synthetic resin. An ester sponge is sandwiched, and the metal plate 12 is formed on the outer surface.

A ventilation fan, preferably a silencing type ventilation fan, may be fixed to the soundproof wall 11 of the vehicle 1 'in order to increase the internal temperature and to allow exhaust gas to escape.

Conventionally, when a large-diameter pile ground improvement method is performed, the capacity of the entire apparatus is very large, so that it cannot be surrounded by a soundproof wall, and the sound insulation effect is insufficient because it is surrounded by a sheet. was there. According to the present invention, since the device is made compact and mounted on a vehicle, it is possible to easily surround the device with a soundproof wall, and it is possible to effectively shield the sound. be able to.

The generator 7 is configured to be able to move up and down on the water tank 8. That is, the generator 7 is stored in the water tank 8 until it arrives at the construction site, and when performing the construction, the generator 7 is raised above the water tank 8 so that the water can be stored in the water tank 8.

As shown in FIG. 4, the generator 7 was mounted on the plate 14 and fixed to the upper end of the side wall of the water tank by locking members (not shown) fixed to the four corners of the plate 14. By hooking a hook (not shown) of the chain block 15, the generator 7 can be moved up and down from inside the water tank 8 onto the water tank 8.

FIGS. 5 and 6 show other means for making the generator 7 freely move up and down. Pulleys 40 and 40 'are fixed to the upper end of the side wall of the water tank 8 so that the pulleys 40 and 40' are fixed. ′ And chains 16, 16 ′. One end of the chains 16, 16 ′ is fixed to the upper end of the bent portion of the upwardly U-shaped plate 17 on which the generator 7 is mounted, and the generator 7 is mounted. The water tank 8 can be moved up and down on the water tank 8.

As shown in FIG. 7, the generator 7 is mounted on a vertically movable plate 18 in the water tank 8.
The generator 18 may be moved up and down from inside the water tank 8 to the water tank 8 by moving the plate 18 up and down.

The plate body 18 comprises two elongated plate bodies 29a, 29
9b are connected at the center, and two plates 29, 29 'formed so as to be openable in an X-shape are opposed to each other and fixed to a vertically moving member connecting both plates 29, 29' at the center connection. Have been.

One end of a jack 30, which is configured to be retractable, is fixed to one plate 29 a of the plate 29, and the other end of the jack 30 is fixed to the bottom surface of the water tank 8.

The plate members 29a, 29b forming the plate members 29, 29 '
One end of 29 b is fixed to the water tank 8 and the plate 18, respectively, and the other end is fixed to the slide groove 31, 31 ′ on the bottom of the plate 18 and the water tank 8, respectively.

When the jack 30 is automatically depressed, X
When one ends of the plate members 29a and 29b forming the character shape slide and the plate member 18 descends, and the jack 30 is automatically pushed up, the plate member 18 rises. Of course, the plate body 18 may be moved up and down by other known means.

Since the above-described equipment is mounted on the heavy vehicles 1, 1 'of the present invention, as shown in FIG. A structure in which a reinforcing material 25 formed in a continuous uneven portion is interposed between 24 and 24 '.

Further, after arriving at the work site, water is stored in the water tank 8, which further increases the weight of the cargo bed. A vehicle overturn prevention device 26 that is movable up and down facing the front and rear is fixed.

The vehicle fall prevention device 26 includes a circular support plate 27.
The telescopic rod 48 is fixed to the
It is configured to be able to come and go inside by hydraulic pressure, water pressure or screw.

[0043]

Next, description will be made of a method of constructing using the apparatus of the present invention configured as described above.

As shown in FIG. 1, the vehicles 1, 1 'are carried into the construction site with their rear portions facing each other. First, the rod 48 of the vehicle fall prevention device 26 is extended downward, and the ground is pressed by the circular support plate 27.

Next, the generator 7 is raised from the water tank, the switch of the generator 7 is turned on, and a predetermined amount of water is supplied to the water tank 8. Then, a predetermined amount of water is supplied into the mixing plant 3, and then a predetermined amount of the admixture is supplied.

Then, the horizontal type O in the cement silo 21
The gas screws 19 and 19 'and the vertical auger screw 20 are rotated to supply a predetermined amount of cement into the cement silo 21. The cement supplied into the cement silo 21 is sent from the horizontal auger screws 19 and 19 'to the vertical auger screw 20 and mixed from the discharge port 46 of the vertical auger screw. In plant 3,
A predetermined amount of cement is supplied. Mixing plant 3
Since the inside is stirred by the submersible pump 14, the cement, the admixture and the water are stirred and mixed to adjust the cement milk.

The cement milk thus prepared is stored in an agitator-4 stirred by a rotating blade. A large-diameter pile ground improvement method using this cement milk may be performed by a known method. That is, the ground may be pierced using the ultra-high pressure pump 9 and water, and simultaneously the cement milk may be poured into the pierced ground using the high pressure pump 5. At this time, the compressor 10 is also used at the same time.

When the sound insulation effect during the above construction was measured,
At a point 5 m away from the plant and 0.9 m in height, the conventional method used to be 90 db.
It was about 60 db, which could be reduced by about 30 db.

[0049]

As described above, according to the present invention, the cement silo containing the auger screw is made compact, so that the large-diameter pile ground improvement method plant can be mounted on a vehicle. Since it is not necessary to assemble and disassemble the plant, it is suitable for work with a short construction period.
By making the plant compact, it was possible to effectively surround it with soundproof walls, making it suitable for night-time work, and because the plant was compact, it was possible to work on narrow worksites without any problems. It offers an epoch-making effect that completely eliminates the disadvantages of the diameter pile improvement method.

[0050]

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a soundproof wall used in the present invention.

FIG. 4 is a perspective view of a device used in the present invention that allows a generator to be moved up and down.

FIG. 5 is a perspective view showing another example of a device that allows the generator used in the present invention to be able to move up and down.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a perspective view showing another example of a device that allows the generator used in the present invention to be able to move up and down.

FIG. 8 is a sectional view of a conventional cement silo.

FIG. 9 is a sectional view of a cement silo of the present invention.

FIG. 10: Auger screw of conventional cement silo
It is sectional drawing which shows a consolidation part.

FIG. 11 is a cross-sectional view showing an auger screw compaction part of the cement silo of the present invention.

FIG. 12 is a sectional view of a conventional cement silo.

FIG. 13 is a sectional view of a cement silo of the present invention.

FIG. 14 is a top view of the mixing plant of the present invention.

FIG. 15 is a side view of the mixing plant of the present invention.

FIG. 16 is a side view of an axis corrector used in the mixing plant of the present invention.

FIG. 17 is a sectional view of a mixing plant of the present invention.

FIG. 18 is a perspective view of a vehicle body of the vehicle according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Large vehicle body 2 Cement silo 3 Mixing plant 4 Agitator 5 High pressure pump 6 Admixture container 7 Generator 8 Water tank 9 Ultra high pressure pump 10 Compressor 11 Soundproof wall 28 Dust collector

Claims (6)

[Claims] 1. A vehicle-mounted ground improvement method plant in which equipment used for the ground improvement method is mounted on a large vehicle to eliminate the need for on-site assembling work and demolition work. Horizontal auger facing the bottom
A screw is placed horizontally, a vertical auger screw is erected near the tip of the opposing auger screw, and cement is mixed through the vertical auger screw to mix the cement. A plant for on-board ground improvement method characterized by being supplied inside. 2. The plant according to claim 1, wherein a recess is formed facing the inner bottom surface of said cement silo, and said horizontal auger screw is opposed to said recess. 3. The plant according to claim 1, wherein said vertical auger screw is provided in said cement silo. 4. The plant according to claim 1, wherein an underwater mixer is provided in said mixing plant. 5. The plant according to claim 4, wherein the underwater mixer has a stirring blade attached to a lower end, and the stirring blade is covered with a safety cover. 6. The soil improvement method plant according to claim 1, wherein said plant is a water tank containing a generator, a cement silo, a mixing plant, an agitator, a compressor, an admixture container, a high-pressure pump, and an ultra-high-pressure pump. Generator,
The plant according to any one of claims 1 to 5, comprising a cement silo power unit, a compressor, a soundproof wall surrounding equipment of the high-pressure pump and the ultrahigh-pressure pump.