JP3655260B2 - Method and apparatus for recovering surplus liquid of solidifying agent - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for recovering an excess liquid of a solidifying agent in a soil cement mixing method.
[0002]
[Prior art]
In large-scale excavation work, construction of a continuous wall by a soil cement mixing method is generally performed as a water-stopping retaining wall in recent years.
[0003]
In this soil cement mixing method, the soil at the excavation site and the cement-based solidifying agent liquid are mixed and stirred during excavation by the excavator to create underground walls (or piles). In order to ensure uniformity, improve stress material insertion, and reduce the load on the excavator (auger), it is necessary to inject about 50 to 90% of cement-based solidifying agent liquid per unit volume of soil to be created. It is common to do.
[0004]
Therefore, a muddy water-like surplus liquid is generated in a form proportional to the injection amount of the cement-based solidifying agent liquid. In many cases, this is naturally dried and then treated as industrial waste.
[0005]
However, such a disposal process requires a process for treating the surplus solidifying agent liquid or mixed soil as an industrial waste, and the industrial waste disposal measure has been an extremely heavy burden.
[0006]
A technique for removing the burden associated with such disposal processing, collecting and recycling surplus liquid, and effectively using the solidifying liquid has been developed and put into practical use.
[0007]
For the recovery of the surplus liquid in the conventional surplus liquid recycling plant, as shown in FIG. 2, the excess overflow of the solidifying agent liquid injected from the excavation head at the tip of the excavating rod 2 of the excavator 1 into the excavated sediment is sucked. The excess liquid sucked in through the suction device 4 of the apparatus 3 is guided to the vibrating screen 7 through the pipes 5 and 6, where the solidifying agent liquid and the mixing in-situ soil are separated.
[0008]
The solidifying agent excess liquid containing separated particles by vibrating screen 7 flows into the first tank T ₁ which is disposed immediately below the vibrating screen 7, the pump this excess liquid is installed in the first tank T ₁ Pumped by P ₁ and sent to the cyclone 8, the recycling solidifying agent surplus liquid from which fine particles have been removed by overflowing in the cyclone 8 is sent to the second tank T ₂ through the pipe 9.
[0009]
And said first tank T ₁ and the second tank T ₂ are such that the equipment does not become bulky, are an appropriate small capacity as possible, first tank T ₁ and the second in relation to the flow of work for the sometimes the liquid volume balance in the second tank T ₂ is lost. Therefore, the pump P ₂ is installed in the second tank T ₂ and returned to the first tank T ₁ through the pipe 10 to balance the liquid amount.
[0010]
From the second tank T ₂ , the recycling solidifying agent liquid is sent to the excavating rod 2 of the excavator 1 through the pump P ₃ , the pipe 11, and a plant (not shown), and injected into the excavated soil from the lower end thereof. Yes.
[0011]
[Problems to be solved by the invention]
However, in the above-described conventional technology, the first and second tanks T ₁ and T ₂ and the second tank T ₂ to the first tank T ₁ are used in the step of separating the solidifying agent liquid and the mixing in-situ soil. to require a pump P ₂ and pipe 10 for returning the liquid, therefore apparatus becomes large and complicated, the processing efficiency of the excess liquid is disadvantageously poor.
[0012]
SUMMARY OF THE INVENTION An object of the present invention is to simplify the facilities for separating the solidifying agent liquid of the excess liquid and the in-situ soil and at the same time improve the workability of the separation.
[0013]
[Means for Solving the Problems]
As means for solving the above-mentioned problems, the present invention constructs a composition such as an underground wall by mixing and stirring the solidifying agent liquid discharged from the excavating head of the excavator and the excavation original site soil excavated by the excavator. In the soil cement mixing method, the solidifying agent surplus liquid separated from the mud-like surplus liquid discharged during excavation and agitation, and the solidifying agent surplus liquid supplied to the cyclone, where the fine particles are removed. The solidifying agent surplus liquid is stored in the same storage tank, and it is selected whether the recycling solidifying agent surplus liquid from which fine particles have been removed by the cyclone is returned to the storage tank or supplied to the excavation head There is in doing so.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
[0016]
FIG. 1 schematically shows an embodiment of an apparatus used for carrying out the present invention. A separator 20 for separating a solidifying agent liquid from earth and sand from muddy surplus liquid discharged during excavation and stirring, and a separator 20. The cyclone 21 that separates and removes the fine particles from the solidification agent surplus liquid separated from the earth and sand, and the solidification for recycling in which the solidification agent surplus liquid separated from the earth and sand by the separator 20 and the fine particles are separated and removed by the cyclone 21. And a storage tank 22 having a single structure for receiving and storing the chemical solution together.
[0017]
In the illustrated embodiment, the separator 20 is based on vibrating screens 23, 24, and is disposed on the storage tank 22.
[0018]
The muddy water-like surplus liquid discharged at the time of excavation is supplied to the upper end position of the lower vibration screen 24 in the inclined arrangement through the pipe 25, and the earth and sand and the solidifying agent liquid are separated by vibration by the vibration device 26 mounted on the separator 20. The separated earth and sand are moved to the downstream side by the inclination of the vibrating screen 24 and discharged as generated residual soil 27 from the end thereof. Further, the solidifying agent liquid separated from the earth and sand passes through the vibration screen 24 and is received in the storage tank 22 below.
[0019]
On the other hand, the cyclone 21 is disposed so as to face the upper surface of the upper vibrating screen 23, and the cyclone 21 is solidified by being stored in the tank 22 by a pump P disposed in the storage tank 22. The agent surplus liquid is pumped up and supplied, and is injected from the tangential direction of the upper part of the cyclone 21 to generate a swirling flow. Fine particulate sands in the solidification agent surplus liquid are captured on the vibrating screen 23 and recycled. Only possible solidifying liquid is returned into the storage tank 22.
[0020]
An agitator 28 that is rotated by a motor M is installed in the storage tank 22, and the interior of the storage tank 22 is agitated by agitation blades 29 and 29 of the agitator 28.
[0021]
The end of the overflow conduit 30 of the recycling solidifying agent liquid overflowed by the cyclone 21 faces the inside of the storage tank, and the recycling solidifying agent liquid is sent to the excavator in the middle of the overflow conduit 30. For this purpose, a pipe line 31 leading to the plant is branched, and three-way valves 32 and 32 are provided at the branch portion, and it is possible to selectively switch between returning the solidifying agent liquid to the storage tank 22 or sending it to the plant. It will be like that. Reference numeral 33 denotes the pump.
[0022]
The three-way valves 32 and 32 preferably have a butterfly valve structure in consideration of clogging due to sedimentation of fine particles in the surplus liquid or earth and sand.
[0023]
The storage tank 22 is provided with a float switch 33 so that when the water level in the storage tank 22 exceeds a predetermined value, the flow of excess liquid into the storage tank 22 is stopped. Troubles such as overflow are prevented in advance.
[0024]
Therefore, the muddy water-like surplus liquid discharged at the time of excavation is sent to the separator 20 through the pipe 25, and is received by the vibrating screen 24 of the separator 20, and the earth and sand are left on it by the vibration of the vibrating screen 24. The solidifying agent liquid that has passed through the screen 24 is collected in the storage tank 22 immediately below it.
[0025]
The earth and sand remaining on the vibrating screen 24 moves to the end due to the vibration of the vibrating screen 24 and is discharged to the outside as the remaining soil 27 and appropriately transported.
[0026]
On the other hand, the solidifying agent liquid that has entered the storage tank 22 is pumped by the pump P and sent to the cyclone 21, and the fine particles are separated by the cyclone 21, and the fine particles are received by the vibrating screen 23, and overflowed. The liquid is returned to the storage tank 22 through the overflow line 30.
[0027]
By performing the above-described operation in one storage tank 22, the earth and sand and fine particles in the excess liquid in the storage tank 22 are gradually reduced to become a recyclable solidifying agent liquid.
[0028]
In order to send the surplus liquid for recycling to the excavator, the three-way valves 32 and 32 are switched to connect the pipes 30 and 31, and sent to the plant to add a predetermined solidifying agent (cement) and control the flow rate. Etc. are supplied to the excavator and supplied from the excavation head into the excavation ground.
[0029]
【The invention's effect】
As described above, according to the present invention, the two tanks T ₁ , T ₂ and the three pumps P ₁ , P ₂ , P _3, which have been conventionally required, are replaced with a single storage tank and a single tank. By using a pump, it is possible to implement the same soil cement mixing method as before, especially by reducing the number of tanks installed, saving equipment costs and installation space, and improving workability by shortening the tank cleaning time. In addition, by reducing the number of pumps used, it is possible to reduce facility costs and power costs, and to improve workability due to the necessity of adjusting the flow rate balance.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Excavator 2 Excavation rod 3 Suction device 8 Cyclone 20 Separator 21 Cyclone 22 Storage tanks 23 and 24 Vibrating screen 32 Three-way valve

Claims (2)

Discharged during excavation and agitation in a soil cement mixing method in which the solidification agent liquid discharged from the excavator head and the excavation site soil excavated by the excavator are mixed and agitated to construct a ground wall or other composition. In the same storage tank, the solidifying agent surplus liquid separated from the soil and sand from the muddy water surplus liquid and the solidifying agent surplus liquid for recycling from which the solidifying agent surplus liquid is supplied to the cyclone and fine particles are removed are contained in the same storage tank. Stored in
A solidifying agent characterized in that it selects whether the recycling solidifying agent surplus liquid from which fine particles have been removed by the cyclone is returned to the storage tank or supplied to the excavation head. Method for collecting excess liquid. It is used for a soil cement mixing method for constructing a composition such as an underground wall by mixing and stirring the solidifying agent liquid discharged from the excavating head of the excavator and the original excavation site soil excavated by the excavator, A separator for separating the solidifying agent surplus liquid from the earth and sand from the muddy water-like surplus liquid discharged during excavation and stirring, and a cyclone for separating and removing fine particles from the solidifying agent surplus liquid separated from the earth and sand by the separator; A storage tank for receiving and storing together a solidifying agent surplus liquid separated from earth and sand by a separator and a recycling solidifying agent surplus liquid from which fine particles have been separated and removed by the cyclone ;
A pipe that communicates with the excavator is branched from a pipe that guides the recycling solidifying agent excess liquid from which fine particles have been removed by the cyclone to the storage tank, and the recycling solidifying agent surplus liquid is provided in any of the pipes. An apparatus for recovering surplus solidifying agent liquid, comprising a switching valve for selectively supplying the solidifying agent.

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