JPS6335914A - Transportation of ground improving agent - Google Patents

Abstract

PURPOSE:To control the amount of carrier gas to a minimum while pneumatic transportation is made in the transport path effectively and exactly by small power by supplying carrier gas to the base of a silo and even to the midway of the transport path. CONSTITUTION:Compressed air is supplied through the hose 14 of a given flow- rate transport path from a compressor 12 to a booster mechanism 16 by a flow rate regulator valve 15 in a bypassed manner. The air is then supplied to cement 7 being transported by a nozzle 20 in a housing 19 from the booster mechanism 16, where the air is smoothly supplied to a jet tube 4 by supplying a transport energy to mix the cement 7 with the earth by stirring. The plant can thus be set on the most easier position a distant apart and the ground can be improved with a high accuracy according to a design.

Description

[Detailed description of the invention] Industrial application field> The disclosed technology belongs to the technical field of solidifying and improving soft ground such as rivers, lakes, coastal reclaimed land, etc.

Summary of the gist> This invention is a method for transporting soil improvement materials such as cement, quicklime, and sand from silos to injection holes at the tip of injection pipes that are deposited into the ground using gases such as air. This invention relates to a method for transporting gas through a long-distance transport route such as a hose, in particular, by supplying a transport gas such as air from a combbrella length to the base of a silo to transport improving materials such as cement, etc. This invention relates to a method for transporting ground improvement materials in which transport gas is further supplied from a booster mechanism provided at a joint 1 or the like in the middle of a transport route such as a long hose.

<Prior art> As is well known, various methods have been researched and developed to improve soft ground by solidifying and effectively utilizing reclaimed land such as rivers, lakes, marshes, and coasts. Until now, chemical injection methods such as water glass have been widely used. However, since the seed chemical injection method injects improved chemicals into the ground, it is contrary to the ability to absorb groundwater, etc. in the ground, and moreover, it causes pollution problems such as contaminating water veins etc. As a result, alternative powder injection stirring methods have been developed and put into practical use, in which powdered improvers such as cement, quicklime, and sand are transported using gases such as air.

In the case of nuclide ground improvement, ground improvement material is supplied from a hopper or tank to a silo, and compressed air from a compressor is used to transport the gas through a hose transport route, and the material is supplied to an injection pipe in the ground and agitated. 1yL of soil from the tips of the wings, etc.
The improvement material and soil are agitated and mixed, and the transport gas rises from between the injection tube and the hole wall and is released into the atmosphere at the ground surface.

<Problems to be Solved by the Invention> However, ground improvement using powdery improvement materials, which have become widely used in place of chemical injection methods, has also begun to cause various problems.

One of them is not related to the technology itself, but while so-called urban civil engineering technology is used when improving rivers in urban areas and mountainous areas, and improving the ground of ponds and marshes, it is important to store improved materials. Due to the installation area, location conditions, etc., plans 1~ for tanks, E-Niro, or complete tree control devices may not necessarily be installed near injection pipes or heavy machinery at the construction site, and in some cases, they may be installed a considerable distance away. Therefore, there is a problem peculiar to urban civil engineering in that the hose for the transportation route from the plant such as a silo to the heavy equipment where the injection pipe is installed is considerably long.

To deal with this, it is possible to increase the diameter of the hose on the transport route or increase the pressure of the compressor.
In the former case, there is a problem that the improved material settles during the transportation process, and if the pressure of the compressor is increased, the amount of air in the transported gas increases, which increases the power cost. Even if a certain amount of improved material could be transported,
As mentioned above, the amount of transport gas such as air is too large during the process of passing between the injection pipe and the hole wall.
There is a drawback that it cannot be dissipated and forms so-called air pockets in the ground, which may impair the accuracy of ground improvement in some cases.If the pressure is too high, the amount of air injected into the ground will increase. There was a problem.

Therefore, in urban civil engineering works such as cities and mountainous areas where narrow land is intricately intertwined, ground improvement using powdered improving materials is disadvantageously restricted.

<Objective of the Invention> The object of the present invention is to solve the problems of ground improvement using powdery improvement materials in narrow areas such as cities and mountainous areas based on the above-mentioned conventional technology, and to While using soil improvement by gas transportation of powdery improved material which has many advantages in the field of transportation, we can reliably and effectively transport the gas along the transportation route with small power while minimizing the amount of gas to be transported as much as possible. In addition, we were able to carry out ground improvement in line with the design h1.
It is an object of the present invention to provide a method for transporting soaked soil improvement materials that is useful for urban civil engineering applications in the r=2 industry.

In order to solve the above-mentioned problems, the structure of the present invention, which is based on the above-mentioned claims, is to solve the above-mentioned problems. Heavy machinery is installed on the ground and the injection pipe is inserted to the desired depth, while a storage tank, silo, compressor,
The plant, including the control equipment, was reconfigured, a transportation route such as a hose was installed for a considerable distance from the silo to the injection pipe, and the compressor was operated to transport the powdered improved material from the silo. In addition, one or more stages of booster FA are provided at a predetermined portion 1t of the transportation route, for example, at a joint, and the booster FA is supplied midway along the transportation direction from its nozzle. In the past, the pressure of the transport gas did not decrease during the transportation route, and even when the improved materials were transported over long distances, they did not settle and were reliably transported to the injection pipe. As the injection pipe rotates up and down, the improvement material is injected into the ground from the nozzle and mixed with the soil, and the transport gas is eventually supplied to the base of the silo and the middle of the transport route. - Because the amount of tal is smaller than the amount supplied only to the base of the silo, it rises smoothly between the injection pipe and the hole wall, and does not inject into the ground through the process of dissipating into the outside air at the ground surface. This technical measure ensures that the entire amount is released to the surface of the earth, and therefore requires less power to operate the compressuna.

<Embodiment> Next, one embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes the ground, which is the target of predetermined ground improvement in urban areas, where heavy machinery 2 similar to conventional equipment is installed, and an injection pipe 4 having a stirring blade 3 at the tip is placed at a predetermined location on the ground 1 along its leader.
It is designed to fit inside.

A plant 5 is installed on land 1', such as a square of a predetermined size, which is separated by a predetermined distance (1) from the improved ground 1, and cements I to 7 as improvement materials are installed in the tank 6. It is stored and supplied to the silo 9 by the elevator competition V8, and the rotary feeder 10 has the same mechanism as the conventional mode in the lower part.
a predetermined distance via the hose 11 as a transport route,
It is connected to a joint (not shown) of heavy equipment 2 that is located far away.

Then, the hose 13 from the compressor 12 installed in parallel to the silo 9 is directed to the rotary feeder 10 in the same way as in the conventional way, and the cement 7 is transported from the rotary feeder 10 to the injection pipe 4 via the hose 11. It is made to be.

Therefore, in this invention, the hose 14 of the transportation gas passage is extended from the compressor 12, and a flow rate adjustment valve 15 is interposed in the middle of the hose 14, so that the flow rate can be initially set and adjusted during operation. , is connected to a booster mechanism 1G provided at a predetermined part of the hose 11 on the transportation route leading to the heavy equipment 2.

As shown in FIG.
Transport gas air is supplied from nozzles 20, 20, .

Control of each of these devices is appropriately performed by a control device 21 which is a part of the plant 5.

In the above-mentioned ground improvement device, the injection pipe 4 is inserted into the improved ground 1 by the heavy equipment 2, while the plan 1
- 5, cement 1 to 7 is supplied from tank 6 to silo 9 by elevator conveyor 8, and compressor 1
2, the rotary feeder 10 rotates, and when air from the compressor 2 is supplied with transport gas at a predetermined pressure to the hose 13 or the rotary feeder 10, the servo port Cement 7 in 812 is smoothly supplied to 2 from the rock feeder 10 via the hose 11 on the transportation route to a predetermined distance i', and passes through the injection pipe 4 to the stirring blade at the tip. 3, it is ejected into the ground 1 in the same manner as in the US case, mixed with the soil, and formed into an improved area 22 as the injection pipe 4 rotates upward.

During this time, since the improvement area is located in a narrow area of land in the city, the hose 11 on the transportation route is installed for a considerable distance, and the compressed air from the compressor 12 is supplied only to the base of the silo 9. (However, in this invention, the pressure air from the compress! is supplied to the booster mechanism 16 via the bore 14 of the
... is supplied to the cement 7 transported by the
is supplied to

Therefore, the total amount of air supplied from the hose 14 to the booster mechanism 16 and the air supplied to the base of the silo 9 via the hose 13 is 4, which is less than the amount of air that would be sent only to the base of the silo 9. As mentioned above, the transport gas air and cement 7 transported by such a small amount of air are injected into the ground 1 from the tip of the stirring blade 3 of the injection pipe 4. , the cement 7 is mixed with the ground and participates in the formation of the improved area 22, and the transport gas air rises along the outside of the injection pipe 4 and the hole wall and dissipates from the ground surface to the outside air. However, since the amount is small, the ground level 1
There is very little ejection into the air, and the entire amount rises and is actually dissipated into the atmosphere.

As mentioned above, the booster mechanism 16 is adjusted by adjusting the air flow rate regulating valve 15 depending on the length of the hose 11 of the transportation route.
The temperature of the air supplied midway from the booster mechanism is adjusted appropriately, and there is no need for midway supply of air from the booster mechanism. -S1
If the length is 1, it is sufficient to remove the booster unit 16 or close the flow rate adjustment valve 15.

It goes without saying that the embodiments of the present invention are not limited to the above-mentioned embodiments, and for example, the transport gas may be supplied to the middle of the transport route only from the oblique nozzle of the housing provided at the joint. Instead, it is possible to do it from a bent nozzle installed directly in the center of the hose.Also, it is possible to insert a pressure regulating valve and on-off valve in the middle of the hose from the compressor to the silo to connect it to the booster. It is possible to omit the on-off valve, or in terms of design changes, the number of booster mechanisms is a predetermined number, and the transport gas passages are branched and connected via headers as appropriate. can be adopted.

In addition to cement, quicklime, sand, and waste materials can also be used as improving materials.

Moreover, the improved ground to be applied can be applied to the ground under water such as rivers, lakes and marshes, or the sea, and it goes without saying that it can also be applied to mountainous areas other than urban areas.

<Effects of the Invention> As described above, according to the present invention, basically, ground improvement using a powder material such as Cement 1 is injected into soft ground instead of the chemical injection method. 100% of the original benefits
The layered effect of being able to make the most of it is produced.

Therefore, the injection pipes of heavy machinery installed on improved ground are silos,
Plants such as tanks and compressors can be installed at locations where it is easiest to install the plants at a distance of one distance, making it possible to avoid 7J% construction conditions that are easily influenced by locational conditions in mountainous areas, civil engineering, and urban civil engineering. A slippery effect is produced that gives a large degree of freedom.

In addition, it is possible to supply transport gas from the middle of the transport route by turning the hose, etc. of the bypass transport gas passage into the transport route and connecting it to the booster machine or collapse nozzle installed on the transport route. Therefore, there is no restriction on the length of the transportation route,
Therefore, the above-mentioned excellent effect that ground improvement using the powdery improving material can be reliably performed in urban areas as well as in narrow mountainous areas is achieved.

In addition, because one transport gas is supplied from the compressor midway through the transport route, the '4Q B of transport gas is
Therefore, after the improvement material is ejected into the ground by the injection pipe, the transport gas can rise smoothly between the injection pipe and the hole wall and escape to the outside air, so that it can reduce the amount of water in the ground. There is no injection of ＼, and therefore, the exceptional effect of being able to perform 1d improvement of the ground with high accuracy in 81 ways is achieved.

Furthermore, since the amount of transport gas to be supplied can be reduced, the moving parts of the compressor can also be reduced, which has the advantage of lowering costs accordingly.

Therefore, the amount of gas transported in the conventional manner can be transported over a much longer route, which increases the degree of freedom in plant installation according to location conditions, makes construction easier, and improves the precision of improvement as a result. The disturbing effect was Qin.

[Brief explanation of the drawing]

The drawings are detailed explanatory diagrams of the present invention, with FIG. 1 being a schematic side view of the installation of the injection pipe and the plant, and FIG. 2 being a schematic vertical sectional view of the booster mechanism.

Claims (5)

[Claims] (1) A method for transporting powdered ground improvement material by gas along a transport route from a silon to an injection pipe, characterized in that the transport gas is supplied to the base of the silo and also to the middle of the transport route. How to transport soil improvement materials. (2) The method for transporting ground improvement material according to claim 1, characterized in that the transport gas is supplied to the middle of the transport route along the transport direction. (3) The method for transporting ground improvement material according to claim 1, characterized in that the transport gas is supplied to the middle of the transport route in multiple stages. (4) The method for transporting ground improvement material according to claim 1, characterized in that the transport gas is supplied to the middle of the transport route at a joint part of the transport route. (5) The method for transporting ground improvement material according to claim 1, characterized in that the transport gas is supplied to the middle of the transport route.