JP2947647B2 - Prevention device for clogging of pressure feed line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention pumps an adhesive material.
At least two or more pressure feed lines for
Adhesive material is pumped independently by each pumping line.
Pumping system in an adhesive material pumping system
The present invention relates to an in-clog prevention device.

[0002]

2. Description of the Related Art In many cases, civil engineering and other structures require construction on soft ground due to restrictions on land use. In addition, ground improvement is inevitable when constructing artificial islands and constructing structures in landfills. Has become. In recent years, various types of ground improvement methods have been developed and put to practical use.For example, a method of injecting an improvement material into soft ground, injecting it while mixing mechanically, and forming an improved ground is being actively performed. I have.

[0003] The ground improvement method can be roughly classified into a CDM method (Cement Deep Mixing) in which a cement slurry is mixed and stirred in a region where mechanical stirring is performed, and an SMW (Soil Mixing Wall) in which a continuous wall of soil cement is constructed. And lime, cement, etc.
The DJM (Dry Jet Mixi), in which the granular material is put on air and sent under pressure, slurried using water in the soil and mixed and consolidated
ng) and water-glass chemicals or cement milk are introduced into the gaps formed by cutting the ground with the jet energy of the injectant and the jet energy of the injectant, and are replaced with excavated earth and sand to form a consolidated body CCP (Chemical-Churning-Pil)
e), high-pressure injection system method represented by JSG (Jumbo-Jet-Special Grout) method.

[0004]

One of the problems in these various ground improvement methods is a clogging phenomenon in a pressure feed line. In particular, when a slurry-based ground improvement material is used or when powder is used, the clogging phenomenon in the middle of the pressure feed line is remarkable due to its adhesion. Conventionally, when the clogging of the improved material occurred in the middle of the pressure feed line, the pressure feed line was disassembled on the ground to fix the clogging. When opened, the improved material scattered, soiling the surroundings and causing safety problems. In addition, the disassembling operation requires time and effort, which causes a delay in the operation process.

Accordingly, a main object of the present invention is to simply and efficiently prevent clogging of an adhesive material in a pressure feed line without decomposition or the like.

[0006]

Means for Solving the Problems] This object is achieved, independent pumping line for pumping adherent material <br/> are formed at least two or more, and adherent material by each pumping line
And is pumped, the adherent material Te system odor <br/> pumping, providing a communicating passage for communicating each of said pumping line to each other,
This can be solved by disposing an on-off valve in the middle of the communication path .

More specifically, a single ground improvement machine has been developed.
Or at least two or more
The ground improvement material pumping line is formed, and
Ground that is independently pumped by each pumping line
In the improved system, the pumping lines communicate with each other
Communication path, and an on-off valve in the middle of the communication path.
Proposed a clogging prevention device for the pressure feed line
I do.

[0008] In the present invention, the respective pressure feed lines are connected to each other.
On-off valves should be installed at both ends of each communication passage.
Is preferred.

[0009]

In the present invention, in particular, the adhesive material is pumped.
At least two or more pressure feed lines for
Adhesive material is pumped independently by each pumping line.
For the system for pumping the adhesive material, each pumping line is communicated with each other, and an on-off valve is arranged in the middle, so if one of the pumping lines is clogged, By opening the on-off valve, a backflow occurs to the other side of the pressure feed line, and the clogging of the one side pressure feed line is released by a vacuum phenomenon due to negative pressure. According to the findings of the present inventors, when the on-off valve disposed in the communication passage is one, the communication passage is filled with the pressure-feeding material, and even when the valve is opened, the vacuum phenomenon becomes slow, and It was found that the clog was not cleared. Therefore, as a result of repeated tests, it has become possible to release clogging almost at the same time as opening the valves by arranging on-off valves at both ends of each of the communication passages and leaving the intermediate portions empty.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments. FIG. 1 is an overall schematic diagram when the clogging prevention device of the present invention is applied to a two-axis DJM method (powder injection stirring method).
FIG. 2 is a view from the front. The ground improvement material supplied from the tank truck 7 is temporarily stored in the improvement material silo 6 and is supplied from the improvement material silo 6 to two improvement material supply machines 2 and 3 arranged side by side. In the case of the two-axis DJM method, one improving material feeder 2, 3 is provided for each of the stirring shafts 16, 18, respectively. For this purpose, air compressors 4, 5 are provided respectively. Since the ground improvement material in the DJM method is fed into the ground as powder, the ground improvement material in the improvement material feeders 2 and 3 is compressed by the air compressors 4 and 5 connected thereto. Ground improvement machine 1 accompanied by air
Sent to Ground improvement material sent to ground improvement machine 1
Stirring shafts 16, 1 via swivel joints 15, 17
It is sprayed from the tip of No. 8 and mixed with soil with stirring.
In addition, bypass air lines are arranged in the lines 8 and 9, and when the ground is excavated, air is supplied from these lines to perform excavation in order to prevent clogging of the lines 8 and 9. To prevent clogging of the bypass air line even during the feeding of improved material,
Supply air at the same time. In addition, check valves 27 and 28 are attached to the bypass air line to prevent the backflow of the improving material.

The ground improvement material used in the DJM method is a dry powder having a maximum diameter of about 5 mm or less, and is made of cement, quicklime, slaked lime, flue gas desulfurized gypsum, ore slag. , Fly ash, sand, crushed stone dust and the like are used, and are appropriately selected according to the properties of the ground and the purpose of improvement. Further, a mixed material in which two or more of these ground improvement materials are mixed can also be used.

In contrast to the above-described two-axis DJM method, the ground improvement system according to the present invention is applied to a soil improvement system in which the ground improvement material to be fed is fed through independent pressure feed lines 8 and 9, respectively.
A locking device is applied. The clogging prevention device of the present invention is configured by connecting the pressure feed lines 8 and 9 by a communication passage 10 and disposing on-off valves 13 and 14 at both ends of the communication passage 10, respectively. Opening / closing valves 11 and 12 provided on the supply side of the improving material feeders 2 and 3 are used to supply the improving material feeds 2 and 3 respectively.
It is provided to prevent backflow to the air and to enhance the vacuum effect. The on-off valves 11 to 11
For 14, an appropriate type such as a manually operated valve, a solenoid valve, or an electric valve can be adopted.

In the clogging prevention device configured as described above, for example, when clogging occurs on the pressure feed line 8 side, the on-off valve 11 is closed and the on-off valve 1 is closed.
When the valves 3 and 14 are opened, the compressed air on the pressure feed line 8 side is sucked into the pressure feed line 9 side and flows backward to generate a negative pressure, and the vacuum phenomenon releases the material clogging.

Next, an example of application to the ground improvement system of the JSG method will be described in detail with reference to FIG. JSG
According to the method, a slurry-based modifier prepared by adding water and an admixture to a cement-based modifier such as early-strength Portland cement and mixing in a mixer 20 or 30 is mixed with an ultrahigh-pressure pump 21 or 3.
1 and then to the soil improvement machines 24 and 34 via the flow recorders 22 and 32, and compressed air from the compressors 23 and 33 arranged side by side.
4 and 34, and the ground improvement material is injected into the ground at high pressure from the injection pipe tip together with the compressed air.

As described above, the clogging prevention device of the present invention is suitably applied even when two sets of ground improvement systems are provided in parallel. The pumping lines 25 and 35 of each ground improvement system are interconnected by the communication passage 19,
On-off valves 26 and 36 are provided at both ends of the communication passage 19, respectively. Then, when the pressure feed line of one of the systems is clogged, the clogging can be released by opening both of the on-off valves 26 and 36.

Further, as shown in FIG. 4, even when the soil cement column walls are formed by a multi-axial ground improvement machine such as the SMW method, the pressure route of cement milk supplied to each of the stirring shafts 40-42. Are connected to each other and an on-off valve is provided between them to prevent clogging.

As mentioned above, the clogging prevention device of the pressure feed line has been described in detail by taking the ground improvement system as an example. However, the present invention is not limited to only the pressure feed of the ground improvement material.
For example, the present invention can be applied to pressure-feeding of a material having an adhesive property that causes a problem of clogging, such as a crack injection material, mortar, concrete, and muddy soil.

[0018]

As described in detail above, according to the present invention, the clogging can be easily released by a simple device without disassembling the pressure feeding line, etc. As a result, the working environment is improved, and effects such as improved work efficiency are brought about.

[Brief description of the drawings]

FIG. 1 is a diagram showing an application example of a clogging prevention device of the present invention to a DJM method.

FIG. 2 is a front view of FIG.

FIG. 3 is a diagram showing an example of application of the apparatus of the present invention to a case where two sets of JSG method systems are installed side by side.

FIG. 4 is a view showing the state of the column wall formation by the SMW method.

[Explanation of symbols]

1: ground improvement machine, 2.3: improvement material feeder, 4.5: air compressor, 6: improvement material silo, 7: tank lorry, 8.
9: pressure feed line, 10: communication path, 11 to 14: on-off valve,
16.18… Stirring shaft

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 3/12 101 B65G 53/66

Claims (3)

(57) [Claims] At least two or more pumping lines for pumping an adhesive material are formed , and the adhesive material is supplied to each pumping line.
Independently pumped adhesive material
In the pressure feeding system , a communication path for communicating the respective pressure feeding lines with each other is provided ,
An apparatus for preventing clogging of a pressure feed line, wherein an on-off valve is provided in the middle of the communication passage . 2. A pumping line for at least two or more ground improvement materials leading to a single soil improvement machine or to a plurality of ground improvement machines is formed, and the ground improvement material is transferred by each of the pumping lines.
In a ground improvement system that is independently pumped, a communication path that mutually connects the pumping lines is provided ,
An apparatus for preventing clogging of a pressure feed line, wherein an on-off valve is provided in the middle of the communication passage . 3. An apparatus for preventing clogging of a pressure feed line according to claim 1 or 2 , wherein on- off valves are respectively provided at both ends of each communication passage connecting said pressure feed lines to each other.