JPS6052255B2 - Powder injection stirring method and equipment - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology is a construction method that ensures the treatment of powder gas exhausted from the supply pipe and the ground gap at the ground surface in powder stirring work for ground improvement. belongs to the field of

Therefore, the invention of this application collects the powder-mixed gas discharged from the exhaust gap formed between the powder supply pipe and the stirring ground in the powder injection stirring method and prevents it from dispersing to the surroundings. This invention relates to a powder injection agitation method and a device directly used therefor, and in particular, it forms a space on the ground surface that seals the above-mentioned supply pipe and also seals the ground surface, and collects the rising powder-mixed gas within the space. The powder in the powder-mixed gas is collected, and then the powder is completely collected using a wet dust collection device, and only the gas is transferred to the outside air. This invention relates to a method and device for spraying and agitating powder.

<Prior art> As is well known, various methods are used to improve soft ground, etc., but compared to sand drains, etc., there is no consolidation settlement and various mixed hardening methods that perform hardening treatment inside the ground have been used. Similar construction methods are widely adopted.

J Among these construction methods, those that use chemicals such as chemicals as hardening agents have drawbacks such as contamination of ground water, etc., and those that use hardening materials in the form of slurry of cement or lime have a problem with water content. There is a drawback that it is irrational to add more moisture to the soft ground with a lot of moisture.

Therefore, a deep stabilization treatment method was devised that utilizes the moisture that originally exists in the ground and ejects coagulant powder such as cement or lime, which does not cause groundwater contamination. Although technologies are being developed to improve various potential bottlenecks, very few construction methods have reached practical use.

However, since it is technically difficult to continuously press powder such as cement into the ground at a predetermined depth using the powder discharge method, the technology developed so far uses gas such as air. It is designed to transport gas.

Therefore, post-treatment of the gas as a transport medium has become a problem.

In addition, experiments have shown that it is extremely effective to separate the powder from the injected powder and gas, and to disperse and mix the powder uniformly by stirring, effectively discharging the gas to the ground surface. Therefore, it is a problem to reliably form a gas discharge gap.

By the way, as shown in FIG. 1, the ground 2 is cut and stirred through the stirring and blowing blades 1 to make a hole to a predetermined depth, and the cement, etc. The powder is ejected into the ground, and the powder, which releases gas under low pressure, is separated by its own weight due to deceleration and mixed with the agitated ground to form a coagulated deposit 4, and the transport gas is transferred to the agitated ground and the powder supply. Vibrator 3
For safety, the vehicle is discharged to the ground through a gap 5 formed between the two.

<Problems to be solved by the invention> However, the gas also contains unstirred powder to varying degrees during the discharge process, and therefore, dust is generated in the working environment on the ground. The environment is worsening due to
It had the disadvantage of causing pollution.

If the exhaust route to the ground is cut off, the exhaust gas accumulates in the ground, causing problems such as cracking the ground and making it difficult to separate it from the powder.

To deal with this, it may be possible to install a blower or the like near the opening of the gap above ground, but this has the disadvantage of being inefficient and requiring a lot of power consumption.

In addition, for example, as shown in Japanese Utility Model Publication No. 48-747, a system has been devised in which dust is removed by introducing the exhaust gas into a dust collector, but because it is a dry type, the dust collection efficiency is poor and backwashing is often required. However, there was a negative point that maintenance, inspection and maintenance were cumbersome.

The purpose of this application is to solve the problem of powder transport gas in the powder injection agitation type ground improvement work based on the above-mentioned conventional technology, and to solve the problem of powder transport gas in the ground improvement work, while making it possible to transport powder into the ground. An excellent powder injection agitation method that reliably removes dust and exhausts only gas during exhaust to the ground, thereby benefiting the field of ground improvement technology in the construction industry, and equipment directly used therefor. This is what we intend to provide.

<Means/effects for solving the problem> In accordance with the above-mentioned object, the structure of the invention of this application, which is summarized in the above-mentioned claims, is to solve the above-mentioned problems by supplying powder into the drilling ground through a powder supply vibrator. A predetermined powder is ejected through gas transport, the powder is separated from the gas and stirred together with the ground, and the powder is transported through a gap formed between the powder supply vibrator and the drilling hole by conveying pressure, or The separated gas is raised by suction negative pressure, the dust is separated by reducing the pressure in the sealed space to the outside at the ground surface, and the dust is completely separated using a wet method, so that only the gas is released to the outside air. This is a technical measure.

Embodiments Next, embodiments of the invention of this application will be described below based on the drawings from FIG. 3 onwards.

Note that the same parts as in FIG. 1 will be explained using the same reference numerals. In the embodiment shown in Figs. 2 and 3, the powder supplying vibrator 3'' has a rectangular cross section as shown in the figure, and is lowered through a swivel joint of a hydrostatic press-fitting device as in the conventional embodiment shown in Fig. 1. It has an agitation cutting/powder jetting blade 1 at its lower end.

Therefore, when ejecting and stirring cement powder as a predetermined improvement material into the target ground 2, only air as a carrier gas is supplied to the powder supply vibrator 3 while giving a rotational stirring action as appropriate through a rotation function and a press-in device. ``If you supply it within
A cutting agitation layer 6 is formed on the ground 2, and the blowing blade 1 is lowered to a predetermined depth.

When the drilling to a predetermined depth is completed, the hemispherical seal cover 8 is fitted on the ground 7 with the half abutment part 9, and is connected with appropriate clamps 10, 10, and the powder is removed. A sealing space 8'' is formed so as to surround the body supplying vibrator 3'' and the surface of the upper surface 7.

A soft rubber packing 11 for contacting the ground surface is provided around the lower edge of the seal cover 8, and a brush 12 serving as a multi-stage sealing mechanism with upper and lower layers is provided inside the inner edge, and a powder supply vibrator is provided. The seal is brought into contact with the outer periphery of the 3''.

Further, a dissipation vibrator 16 is placed at the bottom of a container 15 as a wet-type collection device which has a bulkhead 13 and is filled with water 14 as a water-capturing liquid, and an appropriate suction pump 17 is connected to the dispersion vibrator 16. A suction vibrator 18 as an exhaust vibrator extending from the seal cover 8 is connected to the seal cover 8.

After setting the dust treatment device in this way, cement powder is supplied from the powder gun to the powder supply vibrator 3'' via the swivel joint via gas transport, and the powder is supplied via the rotation mechanism. The jetting blade 1 at the lower end of the vibrator 3'' is rotated at a predetermined speed and simultaneously pulled up at a set speed.

By doing so, the cement as the gas transport powder is fed through the powder supplying vibrator 3'' as shown by the arrow, and is ejected from the nozzle (not shown) of the jetting blade 1 at the lower end. It is ejected from a nozzle that does not contain air, and is re-stirred and mixed with the stirring layer 6, where the water content in the agitation layer and the cement are hydrated, and a reaction begins to proceed to the solidification process, while the air of the ejected transport gas The powder rises from the back of the jetting blade 1 through the gap 5 between the stirring layer 6 and the powder supplying vibrator 3'' due to the difference in inertial force and the air bleed mechanism. Since the powder supplying vibrator 3'' is a rectangular vibrator as described above, the gap 5 between it and the stirring layer 6 is actively formed and is maintained without being blocked by earth pressure. As long as possible, the air will surely rise.The air released to the ground 7 contains some cement mixed in, is confined in the seal space 8'' in the seal cover 8, and is not directly blown out to the ground. do not.
In addition, since the air sealing of the seal cover 8 to the powder supplying vibrator 3'' is performed by the brush 12, even if the powder supplying vibrator 3'' has a square shape, it absorbs the rotation gap and discharges dust. Never. On the other hand, the powder mixed gas 1 is discharged into the seal cover 8 by the operation of the suction pump 17.
9 is sucked from the suction vibrator 18 and discharged and diffused into the water 14 in the container 15. As a result, the powder gas 19 released into the water 14 comes into gas-liquid contact with the water 14, and the cement
The air is collected and becomes a sediment layer 20, and the air rises to the surface in a deep atmosphere and is diffused into the outside air through the mesh.

In this way, while rotating and raising the powder supply vibrator 3'',
Powder injection is carried out while preserving the environment by transporting cement as a gas, ejecting it into the ground 2 and stirring it, and preventing cement powder from floating and dispersing in the work environment on the ground.

Other Embodiments Next, in the embodiment shown in FIGS. 4 and 5, a square cross-section powder supplying vibrator 3'' that is vertically inserted into the seal cover 81 is inserted into the free insertion portion 21. Block 2 to loosely insert “
As shown in FIG. 5, the collar 25 of the seal cover 81 is rotatably and vertically movable via a bearing 23 and a labyrinth 24 as a sealing mechanism, and is attached to the seal space 8'' of the seal cover 81. The powder-mixed gas 19 ejected inside is depressurized, the dust is discharged and deposited, and only the gas is discharged to the outside air from the discharge vibrator 1' as a discharge vibrator.
Substantially, there is no difference in operation and effect compared to the previous embodiment.

In addition, the embodiment shown in FIG.
The exhaust vibrator 1'' having a loosely inserted block 21 is placed facing the collecting liquid tank 82, and the pressure is secondarily reduced and the outside air is discharged by collecting more dust on the liquid surface. , this aspect is also the same as the above two embodiments in terms of operation and effect.Thus, the powder-mixed gas 1
For the rising process of 9, the above square section powder vibrator 3''
In addition, as shown in FIG. 7, a predetermined number of axially fixed fins 26, 26, . This makes it possible to effectively suppress the emission of dust to the ground.

It goes without saying that the embodiments of the invention of this application are not limited to the above-mentioned embodiments. For example, the powder may be other than cement, the treatment of powder-mixed gas) may be a cyclone connection type, or the collection The liquid may be a neutralizing liquid such as a caustic soda liquid or the like, and various embodiments can be adopted.

<Effects of the Invention> According to the invention of this application, the amount of emissions to the ground after the powder is ejected during gas transport in ground improvement work in which powder is ejected and stirred into the ground via a powder supply vibrator is reduced. In the treatment process, a seal cover is installed between the powder supply vibrator and the ground surface to form a sealed space, and the powder-mixed gas is temporarily released into the sealed space to reduce the pressure and move only the powder. By converting energy into gravitational energy, separating and collecting it, and releasing only the gas into the atmosphere, even if the carrier gas required for powder ejection contains powder on the ground and rises as a powder-mixed gas, Because it is collected while being completely shielded from the work environment, it has the excellent effect of allowing powder injection and agitation work in urban areas to be carried out without causing environmental damage or deterioration of conditions. Ru.

Therefore, there is an effect that improvement work by powder injection agitation can be carried out without using water, that is, in areas where water supply and drainage equipment is not required, without any serious restrictions from within the ground to above ground.

Furthermore, by more actively exhausting air through the seal space with a seal cover, the powder-mixed gas can be actively released through the gap in the agitated ground through depressurized diffusion, and therefore, An excellent effect is also achieved in that powder jetting and agitation can be performed safely and reliably and uniformly without causing an increase in air pressure. Furthermore, since the seal cover is connected to the wet dust collection device via the exhaust vibrator, the remaining mixed powder that was vacuumed and collected by gravity at the seal cover is completely collected, and the powder is removed from the outside air. It has an excellent effect of not floating.

[Brief explanation of the drawing]

Fig. 1 is a schematic partial cross-sectional view of the powder injection device, Fig. 2 and the following are explanatory views of embodiments of the invention of this application, Fig. 2 is a partial cross-sectional view of one embodiment, and Fig. 3 is the same as Fig. 1. 4 is a partially cutaway perspective view of another embodiment, FIG. 5 is a partial sectional view of FIG. 4, FIG. 6 is a schematic sectional view of another embodiment, and FIG. 7 is a further other embodiment. FIG. 3 is a partial plan view of the embodiment of FIG. 5... Hole drilling, 2... Ground, 9... Powder gas, 3'', 3'', 3''''... Powder supply vibrator, 8''. ... Seal space, 1 ... Stirring jetting blade, 3'' ... Powder supply vibrator, 12, 24 ...
... Wool mechanism, 8, 81 ... Seal cover, 1
8,1 ``...Exhaust vibe.

Claims (1)

[Scope of Claims] 1. In a powder injection and agitation method in which powder is injected into the ground through a drilled hole and stirred, and the powder-mixed gas that rises is subjected to a vacuum treatment on the ground to collect the powder, A seal space is formed between the powder supply pipe and the ground surface, and the powder-mixed gas rising from the gap between the powder supply pipe and the drilling hole is once depressurized in the space to collect the object. A method for spraying and agitating powder, which is characterized in that the powder is further introduced into the liquid and subjected to wet collection, after which only the gas is discharged to the outside air. 2. In an injection stirring device that is directly used in the injection stirring method, in which powder is jetted into the ground through a drilled hole and agitated, and the powder-mixed gas is depressurized on the ground, a powder supply pipe having a stirring injection blade and a The powder supply pipe is made rotatable and movable up and down through a seal mechanism, and also has a seal cover that forms a seal space with respect to the ground, and the seal cover is configured to allow wet dust to be removed through an exhaust pipe. A powder injection stirring device, characterized in that it is connected to a collection device.