JP3737651B2 - Ground improvement material supply system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The disclosed technology is an improvement material when performing a predetermined ground improvement work, etc., by injecting and injecting the improved material into a ground from a casing pipe fitted into the ground in powder jet stirring construction (hereinafter abbreviated as DJM method). Belongs to the technical field of supply systems.
[0002]
[Prior art]
As is well known, in the special conditions of Japan, where the land is narrow and there are many mountain forests, and the complex long coastline is approaching, not only farming and livestock, but also residential areas and industrial facilities. The plain area that can be effectively used for the structure is extremely limited.Therefore, by improving the soft ground in the basin such as shallow coasts and river lakes, a predetermined improvement material is injected into the soft ground. Civil engineering techniques to improve the ground have been actively used.
[0003]
However, in the conventional soft ground improvement construction work, the improvement material is often a liquid type improvement material, so it does not balance with the liquid content of the soft ground, and the improvement material runs away in the ground or groundwater In order to cope with this, so-called DJM and other methods have been devised to improve the ground by injecting powder jet agitation such as cement into the ground to cope with this. It is becoming.
[0004]
As shown in FIG. 2, the system used for this kind of DJM construction is such that a tank truck 4 loaded with an improvement material such as cement is mounted on a silo 3 of a plant 12 as a system 11 in close proximity to the silo 3 and transported by gas such as air. The loaded improvement material was fed to the silo 3, and the silo 3 was supplied to the hopper 8 at the upper part of the improvement material supply device 71 from the horizontal pulling conveyor 61 via the vertical screw conveyor 61. .
[0005]
Thus, the hoppers 8, 8, etc. supply the improved material supply device 71 to the casing pipe (not shown) through the rotary feeder 72 and the ejector 73, and perform injection injection into the ground. .
[0006]
However, when the improved material is fed from the tank truck 4 to the silo 3, the gas pressure affects the improved material supply device 71 from the silo 3 through the hopper 8, and there is a problem that accurate material management cannot be performed. It was. Therefore, it is necessary to interrupt the supply of the improved material from the silo 3 to the hopper 8 during that time. Therefore, the intermittent operation is performed in the powder injection stirring construction of the improved material. It is also necessary to stop the operation of the vehicle, and in the case where it is difficult to stop the operation, there is a disadvantage that the tank truck 4 has to stand by in the vicinity of the plant system 1, which causes a reduction in construction efficiency. There are drawbacks, and there is a problem that there is a case where there is not enough room to park and wait for the four groups of tank trucks in an area such as a narrow parking lot.
[0007]
And from this, there was also a disadvantage that the construction period was long and the cost was high.
[0008]
[Problems to be solved by the invention]
The object of the invention of this application is from the silo of the gas transport improvement material in the system of the construction plant while having many excellent advantages of the powder injection stirring construction of the improvement material such as the cement of gas transport of the prior art described above. The technical problem to be solved is the problem of staying on the screw conveyor, and it is possible to smoothly introduce the improved material into the silo without causing any obstacles to the function of the rotary feeder and ejector of the improved material device. In order to eliminate the need to wait for tanker trucks, etc., the construction efficiency is good, the price is low, the safety is high, and the powder injection and stirring can be carried out with high efficiency. It is intended to provide a ground supply system.
[0009]
[Means for Solving the Problems]
The above-described objects include a silo for temporarily storing a ground improvement material fed from a tank truck, an improvement material supply device for supplying the ground improvement material toward a construction point, and a ground in the silo. A transport path for transporting the improved material to the improved material feeding apparatus; a gas shut-off valve provided in the middle of the transport path; one end connected to the silo and the other end connected to the transport path And a ground improvement material supply system having a bypass passage. In this case, it is preferable that the transport path is composed of a screw conveyor, and it is preferable that the gas shut-off valve is interlocked with the movement of the screw at a preset timing.
[0010]
[Action]
In the above configuration, when the improvement material such as cement is injected into the ground, the powder injection stirring construction is performed and the ground improvement work is performed, the tank truck loaded with the improvement material is parked in the site yard of the plant system, through the gas transport air transportation, etc., an improved material that is loaded on the tanker truck was fed to the plant silos, vertical screw improvement agent supply apparatus upper part of the hopper from the silo, and, by the lateral pulling screw, When supplying, gas such as air used to clean the spherical valve of the pressure part at the top of the hopper is filled, and interferes with back pressure of the rotary feeder and ejector provided at the lower part of the improvement material supply device defect is located such that relative, the control longitudinal subscriptions so as to bypass the silo the bypass passage from the tip portion of the hopper of the lateral pulling screw The shut-off valve provided in the upper portion of Konbeya in conjunction a screw, automatically transporting the modifying material, and performs a stop, feed for rotary feeder and ejector of improvement agent supply device performed smoothly, as designed The DJM is constructed by powder jet agitation, and the stagnation of the transport gas in the screw conveyor is further prevented by providing a bypass passage .
[0011]
In addition, in the above-described configuration, by connecting the bypass passage to the silo in order to prevent malfunction of the material supply management device provided in the improvement material supply device, when introducing into the silo by gas transport from the tank truck loaded with the improvement material. , so there is no interference by the back pressure of the rotary feeder and ejector, also in the middle of the transport path from silo toward hopper provided shut-off valve such as a butterfly valve, the shutoff valve is a screw conveyor at a timing set in advance In conjunction with this, it is possible to prevent powder tank agitation from being crowded in the parking lot and to efficiently perform powder injection stirring.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the invention of this application will be described as an embodiment with reference to FIG.
[0013]
2 will be described using the same reference numerals.
[0014]
In the embodiment shown in FIG. 1, reference numeral 1 denotes a plant system that forms the center of the present invention. In this embodiment, the ground is improved by powder injection and stirring of cement or the like. A silo 3 is provided in the same manner as the embodiment, and an improvement material such as cement loaded on the tank truck 4 is transported by gas such as air and stored in the silo 3.
[0015]
Thus, in the silo 3, as in the conventional mode, the vertical screw conveyor 61 is raised once, and the improved material is transported from the upper bent portion 63 to the horizontal pulling conveyor 65 in a baton-touch manner and supplied to the hopper 8. However, in the invention of this application, a portion 15 in which air stagnates is generated in the horizontal draw screw conveyor 65 at the top of the hoppers 8 and 8 (air is shown in the portion 15 indicated by hatching in the figure). For this purpose, the bypass passage 13 is branched from this portion and fed back to the silo 3.
[0016]
In the vertical screw conveyor 61 as well, the gas stagnates when the butterfly valve shut-off valve 12 is closed, so that the bypass passage 14 is fed back to the silo 3 from the bent portion 63 at the top of the vertical screw conveyor 61. Has been.
[0017]
As described above, according to the invention of this application, during the construction of the powder jet stirring, it is possible to smoothly introduce the improved material into the silo without causing any obstacle to the functions of the rotary feeder 71 and the ejector 72. Further, during this time, the stagnation of the gas in the stagnation part 15 is fed back to the silo 3 via the bypass passages 13 and 14.
[0018]
Although not described in detail in the invention of this application, various aspects such as automatically opening and closing the shut-off valve 12 of the butterfly valve are automatically linked to the operation of the screw at a specified timing. Is possible.
[0019]
【The invention's effect】
Basically, according to the invention of this application, when performing ground improvement construction work such as DJM or the like by powder injection stirring construction, an improvement material such as cement was once loaded on a tank truck and carried into a parking lot. From the state, the improved material is transported into the silo by gas transportation from the tank lorry vehicle, and further supplied to the hopper at the upper portion of the improved material supply device via the vertical screw conveyor or the horizontal draw screw conveyor. There is no need to interrupt the gas transportation of the improved material or to wait for the tank truck in the parking lot to avoid the stagnation of the gas and the improved material. Bypass from the horizontal screw conveyor and the vertical screw conveyor Air stagnated in the horizontal screw conveyor at the top of the hopper and improved by connecting the passage to the silo in a feedback manner Even if a butterfly valve shut-off valve is provided in the middle of the screw for feedback to the silo, continuous tanker trucks are continuously transported for improvement, and the tank trucks are transported in an orderly manner at the parking lot. The outstanding effect that it can be performed is show | played.
[0020]
And even during construction, since the improvement material can be continuously transported without interruption, ground improvement work such as powder injection agitation is carried out smoothly as designed, efficiently and as designed An excellent effect is achieved that finishing is performed with high accuracy.
[0021]
Therefore, the outstanding effect that the reliability with respect to the constructed | assembled improved ground also improves is show | played.
[0022]
In addition, in the plant system, a simple configuration in which a vertical valve conveyor or a horizontal screw conveyor from a conventional silo is provided with a butterfly valve, and a bypass passage is simply connected to the silo in a feedback manner, Since the work is sufficient, the initial cost is not required, and maintenance, inspection, and operation are easy.
[0023]
And it is very easy as a person skilled in the art to link the opening / closing of a shut-off valve such as a butterfly valve to a screw so as to be interlocked at a preset timing.
[Brief description of the drawings]
FIG. 1 is a schematic side view of the invention of this application.
FIG. 2 is a schematic side view of a system according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 System 2 Plant 3 Silo 4 Tank truck 5 Stagnation part 8 Hopper 12 Air shut-off valve 13 Bypass path 14 Bypass path 61 Vertical screw conveyor 63 Bending part 65 Horizontally drawn screw conveyor 71 Improvement material supply apparatus

Claims (2)

A system for supplying a ground improvement material used in a powder jet stirring method,
A silo for temporarily storing the ground improvement material delivered from the tank truck,
An improvement material supply device for feeding ground improvement material toward the construction point;
A transportation route for transporting the ground improvement material in the silo to the improvement material feeding device;
A gas shut-off valve provided in the middle of the transport path;
A bypass passage having one end connected to the silo and the other end connected to the transport path;
The ground improvement material supply system characterized by having. The transport path comprises a screw conveyor;
The ground improvement material supply system according to claim 1, wherein the gas shut-off valve is interlocked with the movement of the screw at a preset timing.

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